diff --git a/samples/ControlCatalog/ControlCatalog.csproj b/samples/ControlCatalog/ControlCatalog.csproj index 5d8f661990..862de9d320 100644 --- a/samples/ControlCatalog/ControlCatalog.csproj +++ b/samples/ControlCatalog/ControlCatalog.csproj @@ -41,6 +41,9 @@ Designer + + Designer + Designer @@ -116,6 +119,9 @@ BorderPage.xaml + + AutoCompleteBoxPage.xaml + ButtonPage.xaml diff --git a/samples/ControlCatalog/MainView.xaml b/samples/ControlCatalog/MainView.xaml index a2e0980d6a..a0e0df450b 100644 --- a/samples/ControlCatalog/MainView.xaml +++ b/samples/ControlCatalog/MainView.xaml @@ -5,10 +5,11 @@ + - + @@ -27,4 +28,4 @@ - \ No newline at end of file + diff --git a/samples/ControlCatalog/Pages/AutoCompleteBoxPage.xaml b/samples/ControlCatalog/Pages/AutoCompleteBoxPage.xaml new file mode 100644 index 0000000000..943fadf100 --- /dev/null +++ b/samples/ControlCatalog/Pages/AutoCompleteBoxPage.xaml @@ -0,0 +1,59 @@ + + + AutoCompleteBox + A control into which the user can input text + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + \ No newline at end of file diff --git a/samples/ControlCatalog/Pages/AutoCompleteBoxPage.xaml.cs b/samples/ControlCatalog/Pages/AutoCompleteBoxPage.xaml.cs new file mode 100644 index 0000000000..6f3b8361cd --- /dev/null +++ b/samples/ControlCatalog/Pages/AutoCompleteBoxPage.xaml.cs @@ -0,0 +1,143 @@ +using Avalonia.Controls; +using Avalonia.LogicalTree; +using Avalonia.Markup; +using Avalonia.Markup.Xaml; +using Avalonia.Markup.Xaml.Data; +using System; +using System.Collections.Generic; +using System.Linq; +using System.Threading; +using System.Threading.Tasks; + +namespace ControlCatalog.Pages +{ + public class AutoCompleteBoxPage : UserControl + { + public class StateData + { + public string Name { get; private set; } + public string Abbreviation { get; private set; } + public string Capital { get; private set; } + + public StateData(string name, string abbreviatoin, string capital) + { + Name = name; + Abbreviation = abbreviatoin; + Capital = capital; + } + + public override string ToString() + { + return Name; + } + } + + private StateData[] BuildAllStates() + { + return new StateData[] + { + new StateData("Alabama","AL","Montgomery"), + new StateData("Alaska","AK","Juneau"), + new StateData("Arizona","AZ","Phoenix"), + new StateData("Arkansas","AR","Little Rock"), + new StateData("California","CA","Sacramento"), + new StateData("Colorado","CO","Denver"), + new StateData("Connecticut","CT","Hartford"), + new StateData("Delaware","DE","Dover"), + new StateData("Florida","FL","Tallahassee"), + new StateData("Georgia","GA","Atlanta"), + new StateData("Hawaii","HI","Honolulu"), + new StateData("Idaho","ID","Boise"), + new StateData("Illinois","IL","Springfield"), + new StateData("Indiana","IN","Indianapolis"), + new StateData("Iowa","IA","Des Moines"), + new StateData("Kansas","KS","Topeka"), + new StateData("Kentucky","KY","Frankfort"), + new StateData("Louisiana","LA","Baton Rouge"), + new StateData("Maine","ME","Augusta"), + new StateData("Maryland","MD","Annapolis"), + new StateData("Massachusetts","MA","Boston"), + new StateData("Michigan","MI","Lansing"), + new StateData("Minnesota","MN","St. Paul"), + new StateData("Mississippi","MS","Jackson"), + new StateData("Missouri","MO","Jefferson City"), + new StateData("Montana","MT","Helena"), + new StateData("Nebraska","NE","Lincoln"), + new StateData("Nevada","NV","Carson City"), + new StateData("New Hampshire","NH","Concord"), + new StateData("New Jersey","NJ","Trenton"), + new StateData("New Mexico","NM","Santa Fe"), + new StateData("New York","NY","Albany"), + new StateData("North Carolina","NC","Raleigh"), + new StateData("North Dakota","ND","Bismarck"), + new StateData("Ohio","OH","Columbus"), + new StateData("Oklahoma","OK","Oklahoma City"), + new StateData("Oregon","OR","Salem"), + new StateData("Pennsylvania","PA","Harrisburg"), + new StateData("Rhode Island","RI","Providence"), + new StateData("South Carolina","SC","Columbia"), + new StateData("South Dakota","SD","Pierre"), + new StateData("Tennessee","TN","Nashville"), + new StateData("Texas","TX","Austin"), + new StateData("Utah","UT","Salt Lake City"), + new StateData("Vermont","VT","Montpelier"), + new StateData("Virginia","VA","Richmond"), + new StateData("Washington","WA","Olympia"), + new StateData("West Virginia","WV","Charleston"), + new StateData("Wisconsin","WI","Madison"), + new StateData("Wyoming","WY","Cheyenne"), + }; + } + public StateData[] States { get; private set; } + + public AutoCompleteBoxPage() + { + this.InitializeComponent(); + + States = BuildAllStates(); + + foreach (AutoCompleteBox box in GetAllAutoCompleteBox()) + { + box.Items = States; + } + + var converter = new FuncMultiValueConverter(parts => + { + return String.Format("{0} ({1})", parts.ToArray()); + }); + var binding = new MultiBinding { Converter = converter }; + binding.Bindings.Add(new Binding("Name")); + binding.Bindings.Add(new Binding("Abbreviation")); + + var multibindingBox = this.FindControl("MultiBindingBox"); + multibindingBox.ValueMemberBinding = binding; + + var asyncBox = this.FindControl("AsyncBox"); + asyncBox.AsyncPopulator = PopulateAsync; + } + private IEnumerable GetAllAutoCompleteBox() + { + return + this.GetLogicalDescendants() + .OfType(); + } + + private bool StringContains(string str, string query) + { + return str.IndexOf(query, StringComparison.OrdinalIgnoreCase) >= 0; + } + private async Task> PopulateAsync(string searchText, CancellationToken cancellationToken) + { + await Task.Delay(TimeSpan.FromSeconds(1.5), cancellationToken); + + return + States.Where(data => StringContains(data.Name, searchText) || StringContains(data.Capital, searchText)) + .ToList(); + } + + private void InitializeComponent() + { + AvaloniaXamlLoader.Load(this); + } + } +} diff --git a/src/Avalonia.Controls/AutoCompleteBox.cs b/src/Avalonia.Controls/AutoCompleteBox.cs new file mode 100644 index 0000000000..8e801d606b --- /dev/null +++ b/src/Avalonia.Controls/AutoCompleteBox.cs @@ -0,0 +1,2726 @@ +// (c) Copyright Microsoft Corporation. +// This source is subject to the Microsoft Public License (Ms-PL). +// Please see http://go.microsoft.com/fwlink/?LinkID=131993 for details. +// All other rights reserved. + +using System; +using System.Collections; +using System.Collections.Generic; +using System.Collections.ObjectModel; +using System.Collections.Specialized; +using System.ComponentModel; +using System.Linq; +using System.Threading; +using System.Threading.Tasks; +using Avalonia.Collections; +using Avalonia.Controls.Primitives; +using Avalonia.Controls.Templates; +using Avalonia.Controls.Utils; +using Avalonia.Data; +using Avalonia.Input; +using Avalonia.Interactivity; +using Avalonia.Threading; +using Avalonia.VisualTree; + +namespace Avalonia.Controls +{ + /// + /// Provides data for the + /// + /// event. + /// + public class PopulatedEventArgs : EventArgs + { + /// + /// Gets the list of possible matches added to the drop-down portion of + /// the + /// control. + /// + /// The list of possible matches added to the + /// . + public IEnumerable Data { get; private set; } + + /// + /// Initializes a new instance of the + /// . + /// + /// The list of possible matches added to the + /// drop-down portion of the + /// control. + public PopulatedEventArgs(IEnumerable data) + { + Data = data; + } + } + + /// + /// Provides data for the + /// + /// event. + /// + /// Stable + public class PopulatingEventArgs : CancelEventArgs + { + /// + /// Gets the text that is used to determine which items to display in + /// the + /// control. + /// + /// The text that is used to determine which items to display in + /// the . + public string Parameter { get; private set; } + + /// + /// Initializes a new instance of the + /// . + /// + /// The value of the + /// + /// property, which is used to filter items for the + /// control. + public PopulatingEventArgs(string parameter) + { + Parameter = parameter; + } + } + + /// + /// Represents the filter used by the + /// control to + /// determine whether an item is a possible match for the specified text. + /// + /// true to indicate is a possible match + /// for ; otherwise false. + /// The string used as the basis for filtering. + /// The item that is compared with the + /// parameter. + /// The type used for filtering the + /// . This type can + /// be either a string or an object. + /// Stable + public delegate bool AutoCompleteFilterPredicate(string search, T item); + + /// + /// Specifies how text in the text box portion of the + /// control is used + /// to filter items specified by the + /// + /// property for display in the drop-down. + /// + /// Stable + public enum AutoCompleteFilterMode + { + /// + /// Specifies that no filter is used. All items are returned. + /// + None = 0, + + /// + /// Specifies a culture-sensitive, case-insensitive filter where the + /// returned items start with the specified text. The filter uses the + /// + /// method, specifying + /// as + /// the string comparison criteria. + /// + StartsWith = 1, + + /// + /// Specifies a culture-sensitive, case-sensitive filter where the + /// returned items start with the specified text. The filter uses the + /// + /// method, specifying + /// as the string + /// comparison criteria. + /// + StartsWithCaseSensitive = 2, + + /// + /// Specifies an ordinal, case-insensitive filter where the returned + /// items start with the specified text. The filter uses the + /// + /// method, specifying + /// as the + /// string comparison criteria. + /// + StartsWithOrdinal = 3, + + /// + /// Specifies an ordinal, case-sensitive filter where the returned items + /// start with the specified text. The filter uses the + /// + /// method, specifying as + /// the string comparison criteria. + /// + StartsWithOrdinalCaseSensitive = 4, + + /// + /// Specifies a culture-sensitive, case-insensitive filter where the + /// returned items contain the specified text. + /// + Contains = 5, + + /// + /// Specifies a culture-sensitive, case-sensitive filter where the + /// returned items contain the specified text. + /// + ContainsCaseSensitive = 6, + + /// + /// Specifies an ordinal, case-insensitive filter where the returned + /// items contain the specified text. + /// + ContainsOrdinal = 7, + + /// + /// Specifies an ordinal, case-sensitive filter where the returned items + /// contain the specified text. + /// + ContainsOrdinalCaseSensitive = 8, + + /// + /// Specifies a culture-sensitive, case-insensitive filter where the + /// returned items equal the specified text. The filter uses the + /// + /// method, specifying + /// as + /// the search comparison criteria. + /// + Equals = 9, + + /// + /// Specifies a culture-sensitive, case-sensitive filter where the + /// returned items equal the specified text. The filter uses the + /// + /// method, specifying + /// as the string + /// comparison criteria. + /// + EqualsCaseSensitive = 10, + + /// + /// Specifies an ordinal, case-insensitive filter where the returned + /// items equal the specified text. The filter uses the + /// + /// method, specifying + /// as the + /// string comparison criteria. + /// + EqualsOrdinal = 11, + + /// + /// Specifies an ordinal, case-sensitive filter where the returned items + /// equal the specified text. The filter uses the + /// + /// method, specifying as + /// the string comparison criteria. + /// + EqualsOrdinalCaseSensitive = 12, + + /// + /// Specifies that a custom filter is used. This mode is used when the + /// + /// or + /// + /// properties are set. + /// + Custom = 13, + } + + /// + /// Represents a control that provides a text box for user input and a + /// drop-down that contains possible matches based on the input in the text + /// box. + /// + public class AutoCompleteBox : TemplatedControl + { + /// + /// Specifies the name of the selection adapter TemplatePart. + /// + private const string ElementSelectionAdapter = "PART_SelectionAdapter"; + + /// + /// Specifies the name of the Selector TemplatePart. + /// + private const string ElementSelector = "PART_SelectingItemsControl"; + + /// + /// Specifies the name of the Popup TemplatePart. + /// + private const string ElementPopup = "PART_Popup"; + + /// + /// The name for the text box part. + /// + private const string ElementTextBox = "PART_TextBox"; + + private IEnumerable _itemsEnumerable; + + /// + /// Gets or sets a local cached copy of the items data. + /// + private List _items; + + /// + /// Gets or sets the observable collection that contains references to + /// all of the items in the generated view of data that is provided to + /// the selection-style control adapter. + /// + private AvaloniaList _view; + + /// + /// Gets or sets a value to ignore a number of pending change handlers. + /// The value is decremented after each use. This is used to reset the + /// value of properties without performing any of the actions in their + /// change handlers. + /// + /// The int is important as a value because the TextBox + /// TextChanged event does not immediately fire, and this will allow for + /// nested property changes to be ignored. + private int _ignoreTextPropertyChange; + + /// + /// Gets or sets a value indicating whether to ignore calling a pending + /// change handlers. + /// + private bool _ignorePropertyChange; + + /// + /// Gets or sets a value indicating whether to ignore the selection + /// changed event. + /// + private bool _ignoreTextSelectionChange; + + /// + /// Gets or sets a value indicating whether to skip the text update + /// processing when the selected item is updated. + /// + private bool _skipSelectedItemTextUpdate; + + /// + /// Gets or sets the last observed text box selection start location. + /// + private int _textSelectionStart; + + /// + /// Gets or sets a value indicating whether the user initiated the + /// current populate call. + /// + private bool _userCalledPopulate; + + /// + /// A value indicating whether the popup has been opened at least once. + /// + private bool _popupHasOpened; + + /// + /// Gets or sets the DispatcherTimer used for the MinimumPopulateDelay + /// condition for auto completion. + /// + private DispatcherTimer _delayTimer; + + /// + /// Gets or sets a value indicating whether a read-only dependency + /// property change handler should allow the value to be set. This is + /// used to ensure that read-only properties cannot be changed via + /// SetValue, etc. + /// + private bool _allowWrite; + + /// + /// The TextBox template part. + /// + private TextBox _textBox; + private IDisposable _textBoxSubscriptions; + + /// + /// The SelectionAdapter. + /// + private ISelectionAdapter _adapter; + + /// + /// A control that can provide updated string values from a binding. + /// + private BindingEvaluator _valueBindingEvaluator; + + /// + /// A weak subscription for the collection changed event. + /// + private IDisposable _collectionChangeSubscription; + + private IMemberSelector _valueMemberSelector; + private Func>> _asyncPopulator; + private CancellationTokenSource _populationCancellationTokenSource; + + private bool _itemTemplateIsFromValueMemeberBinding = true; + private bool _settingItemTemplateFromValueMemeberBinding; + + private object _selectedItem; + private bool _isDropDownOpen; + private bool _isFocused = false; + + private string _text = string.Empty; + private string _searchText = string.Empty; + + private AutoCompleteFilterPredicate _itemFilter; + private AutoCompleteFilterPredicate _textFilter = AutoCompleteSearch.GetFilter(AutoCompleteFilterMode.StartsWith); + + public static readonly RoutedEvent SelectionChangedEvent = + RoutedEvent.Register(nameof(SelectionChanged), RoutingStrategies.Bubble, typeof(AutoCompleteBox)); + + public static readonly StyledProperty WatermarkProperty = + TextBox.WatermarkProperty.AddOwner(); + + /// + /// Identifies the + /// + /// dependency property. + /// + /// The identifier for the + /// + /// dependency property. + public static readonly StyledProperty MinimumPrefixLengthProperty = + AvaloniaProperty.Register( + nameof(MinimumPrefixLength), 1, + validate: ValidateMinimumPrefixLength); + + /// + /// Identifies the + /// + /// dependency property. + /// + /// The identifier for the + /// + /// dependency property. + public static readonly StyledProperty MinimumPopulateDelayProperty = + AvaloniaProperty.Register( + nameof(MinimumPopulateDelay), + TimeSpan.Zero, + validate: ValidateMinimumPopulateDelay); + + /// + /// Identifies the + /// + /// dependency property. + /// + /// The identifier for the + /// + /// dependency property. + public static readonly StyledProperty MaxDropDownHeightProperty = + AvaloniaProperty.Register( + nameof(MaxDropDownHeight), + double.PositiveInfinity, + validate: ValidateMaxDropDownHeight); + + /// + /// Identifies the + /// + /// dependency property. + /// + /// The identifier for the + /// + /// dependency property. + public static readonly StyledProperty IsTextCompletionEnabledProperty = + AvaloniaProperty.Register(nameof(IsTextCompletionEnabled)); + + /// + /// Identifies the + /// + /// dependency property. + /// + /// The identifier for the + /// + /// dependency property. + public static readonly StyledProperty ItemTemplateProperty = + AvaloniaProperty.Register(nameof(ItemTemplate)); + + /// + /// Identifies the + /// + /// dependency property. + /// + /// The identifier for the + /// + /// dependency property. + public static readonly DirectProperty IsDropDownOpenProperty = + AvaloniaProperty.RegisterDirect( + nameof(IsDropDownOpen), + o => o.IsDropDownOpen, + (o, v) => o.IsDropDownOpen = v); + + /// + /// Identifies the + /// + /// dependency property. + /// + /// The identifier the + /// + /// dependency property. + public static readonly DirectProperty SelectedItemProperty = + AvaloniaProperty.RegisterDirect( + nameof(SelectedItem), + o => o.SelectedItem, + (o, v) => o.SelectedItem = v); + + /// + /// Identifies the + /// + /// dependency property. + /// + /// The identifier for the + /// + /// dependency property. + public static readonly DirectProperty TextProperty = + AvaloniaProperty.RegisterDirect( + nameof(Text), + o => o.Text, + (o, v) => o.Text = v); + + /// + /// Identifies the + /// + /// dependency property. + /// + /// The identifier for the + /// + /// dependency property. + public static readonly DirectProperty SearchTextProperty = + AvaloniaProperty.RegisterDirect( + nameof(SearchText), + o => o.SearchText, + unsetValue: string.Empty); + + /// + /// Gets the identifier for the + /// + /// dependency property. + /// + public static readonly StyledProperty FilterModeProperty = + AvaloniaProperty.Register( + nameof(FilterMode), + defaultValue: AutoCompleteFilterMode.StartsWith, + validate: ValidateFilterMode); + + /// + /// Identifies the + /// + /// dependency property. + /// + /// The identifier for the + /// + /// dependency property. + public static readonly DirectProperty> ItemFilterProperty = + AvaloniaProperty.RegisterDirect>( + nameof(ItemFilter), + o => o.ItemFilter, + (o, v) => o.ItemFilter = v); + + /// + /// Identifies the + /// + /// dependency property. + /// + /// The identifier for the + /// + /// dependency property. + public static readonly DirectProperty> TextFilterProperty = + AvaloniaProperty.RegisterDirect>( + nameof(TextFilter), + o => o.TextFilter, + (o, v) => o.TextFilter = v, + unsetValue: AutoCompleteSearch.GetFilter(AutoCompleteFilterMode.StartsWith)); + + /// + /// Identifies the + /// + /// dependency property. + /// + /// The identifier for the + /// + /// dependency property. + public static readonly DirectProperty ItemsProperty = + AvaloniaProperty.RegisterDirect( + nameof(Items), + o => o.Items, + (o, v) => o.Items = v); + + public static readonly DirectProperty ValueMemberSelectorProperty = + AvaloniaProperty.RegisterDirect( + nameof(ValueMemberSelector), + o => o.ValueMemberSelector, + (o, v) => o.ValueMemberSelector = v); + + public static readonly DirectProperty>>> AsyncPopulatorProperty = + AvaloniaProperty.RegisterDirect>>>( + nameof(AsyncPopulator), + o => o.AsyncPopulator, + (o, v) => o.AsyncPopulator = v); + + private static int ValidateMinimumPrefixLength(AutoCompleteBox control, int value) + { + Contract.Requires(value >= -1); + + return value; + } + + private static TimeSpan ValidateMinimumPopulateDelay(AutoCompleteBox control, TimeSpan value) + { + Contract.Requires(value.TotalMilliseconds >= 0.0); + + return value; + } + + private static double ValidateMaxDropDownHeight(AutoCompleteBox control, double value) + { + Contract.Requires(value >= 0.0); + + return value; + } + + private static bool IsValidFilterMode(AutoCompleteFilterMode mode) + { + switch (mode) + { + case AutoCompleteFilterMode.None: + case AutoCompleteFilterMode.StartsWith: + case AutoCompleteFilterMode.StartsWithCaseSensitive: + case AutoCompleteFilterMode.StartsWithOrdinal: + case AutoCompleteFilterMode.StartsWithOrdinalCaseSensitive: + case AutoCompleteFilterMode.Contains: + case AutoCompleteFilterMode.ContainsCaseSensitive: + case AutoCompleteFilterMode.ContainsOrdinal: + case AutoCompleteFilterMode.ContainsOrdinalCaseSensitive: + case AutoCompleteFilterMode.Equals: + case AutoCompleteFilterMode.EqualsCaseSensitive: + case AutoCompleteFilterMode.EqualsOrdinal: + case AutoCompleteFilterMode.EqualsOrdinalCaseSensitive: + case AutoCompleteFilterMode.Custom: + return true; + default: + return false; + } + } + private static AutoCompleteFilterMode ValidateFilterMode(AutoCompleteBox control, AutoCompleteFilterMode value) + { + Contract.Requires(IsValidFilterMode(value)); + + return value; + } + + /// + /// Handle the change of the IsEnabled property. + /// + /// The event data. + private void OnControlIsEnabledChanged(AvaloniaPropertyChangedEventArgs e) + { + bool isEnabled = (bool)e.NewValue; + if (!isEnabled) + { + IsDropDownOpen = false; + } + } + + /// + /// MinimumPopulateDelayProperty property changed handler. Any current + /// dispatcher timer will be stopped. The timer will not be restarted + /// until the next TextUpdate call by the user. + /// + /// Event arguments. + private void OnMinimumPopulateDelayChanged(AvaloniaPropertyChangedEventArgs e) + { + var newValue = (TimeSpan)e.NewValue; + + // Stop any existing timer + if (_delayTimer != null) + { + _delayTimer.Stop(); + + if (newValue == TimeSpan.Zero) + { + _delayTimer = null; + } + } + + if (newValue > TimeSpan.Zero) + { + // Create or clear a dispatcher timer instance + if (_delayTimer == null) + { + _delayTimer = new DispatcherTimer(); + _delayTimer.Tick += PopulateDropDown; + } + + // Set the new tick interval + _delayTimer.Interval = newValue; + } + } + + /// + /// IsDropDownOpenProperty property changed handler. + /// + /// Event arguments. + private void OnIsDropDownOpenChanged(AvaloniaPropertyChangedEventArgs e) + { + // Ignore the change if requested + if (_ignorePropertyChange) + { + _ignorePropertyChange = false; + return; + } + + bool oldValue = (bool)e.OldValue; + bool newValue = (bool)e.NewValue; + + if (newValue) + { + TextUpdated(Text, true); + } + else + { + ClosingDropDown(oldValue); + } + + UpdatePseudoClasses(); + } + + private void OnSelectedItemPropertyChanged(AvaloniaPropertyChangedEventArgs e) + { + if (_ignorePropertyChange) + { + _ignorePropertyChange = false; + return; + } + + // Update the text display + if (_skipSelectedItemTextUpdate) + { + _skipSelectedItemTextUpdate = false; + } + else + { + OnSelectedItemChanged(e.NewValue); + } + + // Fire the SelectionChanged event + List removed = new List(); + if (e.OldValue != null) + { + removed.Add(e.OldValue); + } + + List added = new List(); + if (e.NewValue != null) + { + added.Add(e.NewValue); + } + + OnSelectionChanged(new SelectionChangedEventArgs(SelectionChangedEvent, removed, added)); + } + + /// + /// TextProperty property changed handler. + /// + /// Event arguments. + private void OnTextPropertyChanged(AvaloniaPropertyChangedEventArgs e) + { + TextUpdated((string)e.NewValue, false); + } + + private void OnSearchTextPropertyChanged(AvaloniaPropertyChangedEventArgs e) + { + if (_ignorePropertyChange) + { + _ignorePropertyChange = false; + return; + } + + // Ensure the property is only written when expected + if (!_allowWrite) + { + // Reset the old value before it was incorrectly written + _ignorePropertyChange = true; + SetValue(e.Property, e.OldValue); + + throw new InvalidOperationException("Cannot set read-only property SearchText."); + } + } + + /// + /// FilterModeProperty property changed handler. + /// + /// Event arguments. + private void OnFilterModePropertyChanged(AvaloniaPropertyChangedEventArgs e) + { + AutoCompleteFilterMode mode = (AutoCompleteFilterMode)e.NewValue; + + // Sets the filter predicate for the new value + TextFilter = AutoCompleteSearch.GetFilter(mode); + } + + /// + /// ItemFilterProperty property changed handler. + /// + /// Event arguments. + private void OnItemFilterPropertyChanged(AvaloniaPropertyChangedEventArgs e) + { + AutoCompleteFilterPredicate value = e.NewValue as AutoCompleteFilterPredicate; + + // If null, revert to the "None" predicate + if (value == null) + { + FilterMode = AutoCompleteFilterMode.None; + } + else + { + FilterMode = AutoCompleteFilterMode.Custom; + TextFilter = null; + } + } + + /// + /// ItemsSourceProperty property changed handler. + /// + /// Event arguments. + private void OnItemsPropertyChanged(AvaloniaPropertyChangedEventArgs e) + { + OnItemsChanged((IEnumerable)e.NewValue); + } + + private void OnItemTemplatePropertyChanged(AvaloniaPropertyChangedEventArgs e) + { + if (!_settingItemTemplateFromValueMemeberBinding) + _itemTemplateIsFromValueMemeberBinding = false; + } + private void OnValueMemberBindingChanged(IBinding value) + { + if(_itemTemplateIsFromValueMemeberBinding) + { + var template = + new FuncDataTemplate( + typeof(object), + o => + { + var control = new ContentControl(); + control.Bind(ContentControl.ContentProperty, value); + return control; + }); + + _settingItemTemplateFromValueMemeberBinding = true; + ItemTemplate = template; + _settingItemTemplateFromValueMemeberBinding = false; + } + } + + static AutoCompleteBox() + { + FocusableProperty.OverrideDefaultValue(true); + + MinimumPopulateDelayProperty.Changed.AddClassHandler(x => x.OnMinimumPopulateDelayChanged); + IsDropDownOpenProperty.Changed.AddClassHandler(x => x.OnIsDropDownOpenChanged); + SelectedItemProperty.Changed.AddClassHandler(x => x.OnSelectedItemPropertyChanged); + TextProperty.Changed.AddClassHandler(x => x.OnTextPropertyChanged); + SearchTextProperty.Changed.AddClassHandler(x => x.OnSearchTextPropertyChanged); + FilterModeProperty.Changed.AddClassHandler(x => x.OnFilterModePropertyChanged); + ItemFilterProperty.Changed.AddClassHandler(x => x.OnItemFilterPropertyChanged); + ItemsProperty.Changed.AddClassHandler(x => x.OnItemsPropertyChanged); + IsEnabledProperty.Changed.AddClassHandler(x => x.OnControlIsEnabledChanged); + } + + /// + /// Initializes a new instance of the + /// class. + /// + public AutoCompleteBox() + { + ClearView(); + } + + /// + /// Gets or sets the minimum number of characters required to be entered + /// in the text box before the + /// displays + /// possible matches. + /// matches. + /// + /// + /// The minimum number of characters to be entered in the text box + /// before the + /// displays possible matches. The default is 1. + /// + /// + /// If you set MinimumPrefixLength to -1, the AutoCompleteBox will + /// not provide possible matches. There is no maximum value, but + /// setting MinimumPrefixLength to value that is too large will + /// prevent the AutoCompleteBox from providing possible matches as well. + /// + public int MinimumPrefixLength + { + get { return GetValue(MinimumPrefixLengthProperty); } + set { SetValue(MinimumPrefixLengthProperty, value); } + } + + /// + /// Gets or sets a value indicating whether the first possible match + /// found during the filtering process will be displayed automatically + /// in the text box. + /// + /// + /// True if the first possible match found will be displayed + /// automatically in the text box; otherwise, false. The default is + /// false. + /// + public bool IsTextCompletionEnabled + { + get { return GetValue(IsTextCompletionEnabledProperty); } + set { SetValue(IsTextCompletionEnabledProperty, value); } + } + + /// + /// Gets or sets the used + /// to display each item in the drop-down portion of the control. + /// + /// The used to + /// display each item in the drop-down. The default is null. + /// + /// You use the ItemTemplate property to specify the visualization + /// of the data objects in the drop-down portion of the AutoCompleteBox + /// control. If your AutoCompleteBox is bound to a collection and you + /// do not provide specific display instructions by using a + /// DataTemplate, the resulting UI of each item is a string + /// representation of each object in the underlying collection. + /// + public IDataTemplate ItemTemplate + { + get { return GetValue(ItemTemplateProperty); } + set { SetValue(ItemTemplateProperty, value); } + } + + /// + /// Gets or sets the minimum delay, after text is typed + /// in the text box before the + /// control + /// populates the list of possible matches in the drop-down. + /// + /// The minimum delay, after text is typed in + /// the text box, but before the + /// populates + /// the list of possible matches in the drop-down. The default is 0. + public TimeSpan MinimumPopulateDelay + { + get { return GetValue(MinimumPopulateDelayProperty); } + set { SetValue(MinimumPopulateDelayProperty, value); } + } + + /// + /// Gets or sets the maximum height of the drop-down portion of the + /// control. + /// + /// The maximum height of the drop-down portion of the + /// control. + /// The default is . + /// The specified value is less than 0. + public double MaxDropDownHeight + { + get { return GetValue(MaxDropDownHeightProperty); } + set { SetValue(MaxDropDownHeightProperty, value); } + } + + /// + /// Gets or sets a value indicating whether the drop-down portion of + /// the control is open. + /// + /// + /// True if the drop-down is open; otherwise, false. The default is + /// false. + /// + public bool IsDropDownOpen + { + get { return _isDropDownOpen; } + set { SetAndRaise(IsDropDownOpenProperty, ref _isDropDownOpen, value); } + } + + /// + /// Gets or sets the that + /// is used to get the values for display in the text portion of + /// the + /// control. + /// + /// The object used + /// when binding to a collection property. + [AssignBinding] + public IBinding ValueMemberBinding + { + get { return _valueBindingEvaluator?.ValueBinding; } + set + { + if (ValueMemberBinding != value) + { + _valueBindingEvaluator = new BindingEvaluator(value); + OnValueMemberBindingChanged(value); + } + } + } + + /// + /// Gets or sets the MemberSelector that is used to get values for + /// display in the text portion of the + /// control. + /// + /// The MemberSelector that is used to get values for display in + /// the text portion of the + /// control. + public IMemberSelector ValueMemberSelector + { + get { return _valueMemberSelector; } + set { SetAndRaise(ValueMemberSelectorProperty, ref _valueMemberSelector, value); } + } + + /// + /// Gets or sets the selected item in the drop-down. + /// + /// The selected item in the drop-down. + /// + /// If the IsTextCompletionEnabled property is true and text typed by + /// the user matches an item in the ItemsSource collection, which is + /// then displayed in the text box, the SelectedItem property will be + /// a null reference. + /// + public object SelectedItem + { + get { return _selectedItem; } + set { SetAndRaise(SelectedItemProperty, ref _selectedItem, value); } + } + + /// + /// Gets or sets the text in the text box portion of the + /// control. + /// + /// The text in the text box portion of the + /// control. + public string Text + { + get { return _text; } + set { SetAndRaise(TextProperty, ref _text, value); } + } + + /// + /// Gets the text that is used to filter items in the + /// + /// item collection. + /// + /// The text that is used to filter items in the + /// + /// item collection. + /// + /// The SearchText value is typically the same as the + /// Text property, but is set after the TextChanged event occurs + /// and before the Populating event. + /// + public string SearchText + { + get { return _searchText; } + private set + { + try + { + _allowWrite = true; + SetAndRaise(SearchTextProperty, ref _searchText, value); + } + finally + { + _allowWrite = false; + } + } + } + + /// + /// Gets or sets how the text in the text box is used to filter items + /// specified by the + /// + /// property for display in the drop-down. + /// + /// One of the + /// + /// values The default is + /// . + /// The specified value is + /// not a valid + /// . + /// + /// Use the FilterMode property to specify how possible matches are + /// filtered. For example, possible matches can be filtered in a + /// predefined or custom way. The search mode is automatically set to + /// Custom if you set the ItemFilter property. + /// + public AutoCompleteFilterMode FilterMode + { + get { return GetValue(FilterModeProperty); } + set { SetValue(FilterModeProperty, value); } + } + + public string Watermark + { + get { return GetValue(WatermarkProperty); } + set { SetValue(WatermarkProperty, value); } + } + + /// + /// Gets or sets the custom method that uses user-entered text to filter + /// the items specified by the + /// + /// property for display in the drop-down. + /// + /// The custom method that uses the user-entered text to filter + /// the items specified by the + /// + /// property. The default is null. + /// + /// The filter mode is automatically set to Custom if you set the + /// ItemFilter property. + /// + public AutoCompleteFilterPredicate ItemFilter + { + get { return _itemFilter; } + set { SetAndRaise(ItemFilterProperty, ref _itemFilter, value); } + } + + /// + /// Gets or sets the custom method that uses the user-entered text to + /// filter items specified by the + /// + /// property in a text-based way for display in the drop-down. + /// + /// The custom method that uses the user-entered text to filter + /// items specified by the + /// + /// property in a text-based way for display in the drop-down. + /// + /// The search mode is automatically set to Custom if you set the + /// TextFilter property. + /// + public AutoCompleteFilterPredicate TextFilter + { + get { return _textFilter; } + set { SetAndRaise(TextFilterProperty, ref _textFilter, value); } + } + + public Func>> AsyncPopulator + { + get { return _asyncPopulator; } + set { SetAndRaise(AsyncPopulatorProperty, ref _asyncPopulator, value); } + } + + /// + /// Gets or sets a collection that is used to generate the items for the + /// drop-down portion of the + /// control. + /// + /// The collection that is used to generate the items of the + /// drop-down portion of the + /// control. + public IEnumerable Items + { + get { return _itemsEnumerable; } + set { SetAndRaise(ItemsProperty, ref _itemsEnumerable, value); } + } + + /// + /// Gets or sets the drop down popup control. + /// + private Popup DropDownPopup { get; set; } + + /// + /// Gets or sets the Text template part. + /// + private TextBox TextBox + { + get { return _textBox; } + set + { + _textBoxSubscriptions?.Dispose(); + _textBox = value; + + // Attach handlers + if (_textBox != null) + { + _textBoxSubscriptions = + _textBox.GetObservable(TextBox.TextProperty) + .Subscribe(_ => OnTextBoxTextChanged()); + + if (Text != null) + { + UpdateTextValue(Text); + } + } + } + } + + private int TextBoxSelectionStart + { + get + { + if (TextBox != null) + { + return Math.Min(TextBox.SelectionStart, TextBox.SelectionEnd); + } + else + { + return 0; + } + } + } + private int TextBoxSelectionLength + { + get + { + if (TextBox != null) + { + return Math.Abs(TextBox.SelectionEnd - TextBox.SelectionStart); + } + else + { + return 0; + } + } + } + + /// + /// Gets or sets the selection adapter used to populate the drop-down + /// with a list of selectable items. + /// + /// The selection adapter used to populate the drop-down with a + /// list of selectable items. + /// + /// You can use this property when you create an automation peer to + /// use with AutoCompleteBox or deriving from AutoCompleteBox to + /// create a custom control. + /// + protected ISelectionAdapter SelectionAdapter + { + get { return _adapter; } + set + { + if (_adapter != null) + { + _adapter.SelectionChanged -= OnAdapterSelectionChanged; + _adapter.Commit -= OnAdapterSelectionComplete; + _adapter.Cancel -= OnAdapterSelectionCanceled; + _adapter.Cancel -= OnAdapterSelectionComplete; + _adapter.Items = null; + } + + _adapter = value; + + if (_adapter != null) + { + _adapter.SelectionChanged += OnAdapterSelectionChanged; + _adapter.Commit += OnAdapterSelectionComplete; + _adapter.Cancel += OnAdapterSelectionCanceled; + _adapter.Cancel += OnAdapterSelectionComplete; + _adapter.Items = _view; + } + } + } + + /// + /// Returns the + /// part, if + /// possible. + /// + /// + /// A object, + /// if possible. Otherwise, null. + /// + protected virtual ISelectionAdapter GetSelectionAdapterPart(INameScope nameScope) + { + ISelectionAdapter adapter = null; + SelectingItemsControl selector = nameScope.Find(ElementSelector); + if (selector != null) + { + // Check if it is already an IItemsSelector + adapter = selector as ISelectionAdapter; + if (adapter == null) + { + // Built in support for wrapping a Selector control + adapter = new SelectingItemsControlSelectionAdapter(selector); + } + } + if (adapter == null) + { + adapter = nameScope.Find(ElementSelectionAdapter); + } + return adapter; + } + + /// + /// Builds the visual tree for the + /// control + /// when a new template is applied. + /// + protected override void OnTemplateApplied(TemplateAppliedEventArgs e) + { + + if (DropDownPopup != null) + { + DropDownPopup.Closed -= DropDownPopup_Closed; + DropDownPopup = null; + } + + // Set the template parts. Individual part setters remove and add + // any event handlers. + Popup popup = e.NameScope.Find(ElementPopup); + if (popup != null) + { + DropDownPopup = popup; + DropDownPopup.Closed += DropDownPopup_Closed; + } + + SelectionAdapter = GetSelectionAdapterPart(e.NameScope); + TextBox = e.NameScope.Find(ElementTextBox); + + // If the drop down property indicates that the popup is open, + // flip its value to invoke the changed handler. + if (IsDropDownOpen && DropDownPopup != null && !DropDownPopup.IsOpen) + { + OpeningDropDown(false); + } + + base.OnTemplateApplied(e); + } + + /// + /// Provides handling for the + /// event. + /// + /// A + /// that contains the event data. + protected override void OnKeyDown(KeyEventArgs e) + { + Contract.Requires(e != null); + + base.OnKeyDown(e); + + if (e.Handled || !IsEnabled) + { + return; + } + + // The drop down is open, pass along the key event arguments to the + // selection adapter. If it isn't handled by the adapter's logic, + // then we handle some simple navigation scenarios for controlling + // the drop down. + if (IsDropDownOpen) + { + if (SelectionAdapter != null) + { + SelectionAdapter.HandleKeyDown(e); + if (e.Handled) + { + return; + } + } + + if (e.Key == Key.Escape) + { + OnAdapterSelectionCanceled(this, new RoutedEventArgs()); + e.Handled = true; + } + } + else + { + // The drop down is not open, the Down key will toggle it open. + if (e.Key == Key.Down) + { + IsDropDownOpen = true; + e.Handled = true; + } + } + + // Standard drop down navigation + switch (e.Key) + { + case Key.F4: + IsDropDownOpen = !IsDropDownOpen; + e.Handled = true; + break; + + case Key.Enter: + OnAdapterSelectionComplete(this, new RoutedEventArgs()); + e.Handled = true; + break; + + default: + break; + } + } + + /// + /// Provides handling for the + /// event. + /// + /// A + /// that contains the event data. + protected override void OnGotFocus(GotFocusEventArgs e) + { + base.OnGotFocus(e); + FocusChanged(HasFocus()); + } + + /// + /// Provides handling for the + /// event. + /// + /// A + /// that contains the event data. + protected override void OnLostFocus(RoutedEventArgs e) + { + base.OnLostFocus(e); + FocusChanged(HasFocus()); + } + + /// + /// Determines whether the text box or drop-down portion of the + /// control has + /// focus. + /// + /// true to indicate the + /// has focus; + /// otherwise, false. + protected bool HasFocus() + { + IVisual focused = FocusManager.Instance.Current; + + while (focused != null) + { + if (object.ReferenceEquals(focused, this)) + { + return true; + } + + // This helps deal with popups that may not be in the same + // visual tree + IVisual parent = focused.GetVisualParent(); + if (parent == null) + { + // Try the logical parent. + IControl element = focused as IControl; + if (element != null) + { + parent = element.Parent; + } + } + focused = parent; + } + return false; + } + + /// + /// Handles the FocusChanged event. + /// + /// A value indicating whether the control + /// currently has the focus. + private void FocusChanged(bool hasFocus) + { + // The OnGotFocus & OnLostFocus are asynchronously and cannot + // reliably tell you that have the focus. All they do is let you + // know that the focus changed sometime in the past. To determine + // if you currently have the focus you need to do consult the + // FocusManager (see HasFocus()). + + bool wasFocused = _isFocused; + _isFocused = hasFocus; + + if (hasFocus) + { + + if (!wasFocused && TextBox != null && TextBoxSelectionLength <= 0) + { + TextBox.Focus(); + TextBox.SelectionStart = 0; + TextBox.SelectionEnd = TextBox.Text?.Length ?? 0; + } + } + else + { + IsDropDownOpen = false; + _userCalledPopulate = false; + ClearTextBoxSelection(); + } + + _isFocused = hasFocus; + } + + /// + /// Occurs when the text in the text box portion of the + /// changes. + /// + public event EventHandler TextChanged; + + /// + /// Occurs when the + /// is + /// populating the drop-down with possible matches based on the + /// + /// property. + /// + /// + /// If the event is canceled, by setting the PopulatingEventArgs.Cancel + /// property to true, the AutoCompleteBox will not automatically + /// populate the selection adapter contained in the drop-down. + /// In this case, if you want possible matches to appear, you must + /// provide the logic for populating the selection adapter. + /// + public event EventHandler Populating; + + /// + /// Occurs when the + /// has + /// populated the drop-down with possible matches based on the + /// + /// property. + /// + public event EventHandler Populated; + + /// + /// Occurs when the value of the + /// + /// property is changing from false to true. + /// + public event EventHandler DropDownOpening; + + /// + /// Occurs when the value of the + /// + /// property has changed from false to true and the drop-down is open. + /// + public event EventHandler DropDownOpened; + + /// + /// Occurs when the + /// + /// property is changing from true to false. + /// + public event EventHandler DropDownClosing; + + /// + /// Occurs when the + /// + /// property was changed from true to false and the drop-down is open. + /// + public event EventHandler DropDownClosed; + + /// + /// Occurs when the selected item in the drop-down portion of the + /// has + /// changed. + /// + public event EventHandler SelectionChanged + { + add { AddHandler(SelectionChangedEvent, value); } + remove { RemoveHandler(SelectionChangedEvent, value); } + } + + /// + /// Raises the + /// + /// event. + /// + /// A + /// that + /// contains the event data. + protected virtual void OnPopulating(PopulatingEventArgs e) + { + Populating?.Invoke(this, e); + } + + /// + /// Raises the + /// + /// event. + /// + /// A + /// + /// that contains the event data. + protected virtual void OnPopulated(PopulatedEventArgs e) + { + Populated?.Invoke(this, e); + } + + /// + /// Raises the + /// + /// event. + /// + /// A + /// + /// that contains the event data. + protected virtual void OnSelectionChanged(SelectionChangedEventArgs e) + { + RaiseEvent(e); + } + + /// + /// Raises the + /// + /// event. + /// + /// A + /// + /// that contains the event data. + protected virtual void OnDropDownOpening(CancelEventArgs e) + { + DropDownOpening?.Invoke(this, e); + } + + /// + /// Raises the + /// + /// event. + /// + /// A + /// + /// that contains the event data. + protected virtual void OnDropDownOpened(EventArgs e) + { + DropDownOpened?.Invoke(this, e); + } + + /// + /// Raises the + /// + /// event. + /// + /// A + /// + /// that contains the event data. + protected virtual void OnDropDownClosing(CancelEventArgs e) + { + DropDownClosing?.Invoke(this, e); + } + + /// + /// Raises the + /// + /// event. + /// + /// A + /// + /// which contains the event data. + protected virtual void OnDropDownClosed(EventArgs e) + { + DropDownClosed?.Invoke(this, e); + } + + /// + /// Raises the + /// + /// event. + /// + /// A + /// that contains the event data. + protected virtual void OnTextChanged(RoutedEventArgs e) + { + TextChanged?.Invoke(this, e); + } + + /// + /// Begin closing the drop-down. + /// + /// The original value. + private void ClosingDropDown(bool oldValue) + { + var args = new CancelEventArgs(); + OnDropDownClosing(args); + + if (args.Cancel) + { + _ignorePropertyChange = true; + SetValue(IsDropDownOpenProperty, oldValue); + } + else + { + CloseDropDown(); + } + + UpdatePseudoClasses(); + } + + /// + /// Begin opening the drop down by firing cancelable events, opening the + /// drop-down or reverting, depending on the event argument values. + /// + /// The original value, if needed for a revert. + private void OpeningDropDown(bool oldValue) + { + var args = new CancelEventArgs(); + + // Opening + OnDropDownOpening(args); + + if (args.Cancel) + { + _ignorePropertyChange = true; + SetValue(IsDropDownOpenProperty, oldValue); + } + else + { + OpenDropDown(); + } + + UpdatePseudoClasses(); + } + + /// + /// Connects to the DropDownPopup Closed event. + /// + /// The source object. + /// The event data. + private void DropDownPopup_Closed(object sender, EventArgs e) + { + // Force the drop down dependency property to be false. + if (IsDropDownOpen) + { + IsDropDownOpen = false; + } + + // Fire the DropDownClosed event + if (_popupHasOpened) + { + OnDropDownClosed(EventArgs.Empty); + } + } + + /// + /// Handles the timer tick when using a populate delay. + /// + /// The source object. + /// The event arguments. + private void PopulateDropDown(object sender, EventArgs e) + { + if (_delayTimer != null) + { + _delayTimer.Stop(); + } + + // Update the prefix/search text. + SearchText = Text; + + if(TryPopulateAsync(SearchText)) + { + return; + } + + // The Populated event enables advanced, custom filtering. The + // client needs to directly update the ItemsSource collection or + // call the Populate method on the control to continue the + // display process if Cancel is set to true. + PopulatingEventArgs populating = new PopulatingEventArgs(SearchText); + OnPopulating(populating); + if (!populating.Cancel) + { + PopulateComplete(); + } + } + private bool TryPopulateAsync(string searchText) + { + _populationCancellationTokenSource?.Cancel(false); + _populationCancellationTokenSource?.Dispose(); + _populationCancellationTokenSource = null; + + if(_asyncPopulator == null) + { + return false; + } + + _populationCancellationTokenSource = new CancellationTokenSource(); + var task = PopulateAsync(searchText, _populationCancellationTokenSource.Token); + if (task.Status == TaskStatus.Created) + task.Start(); + + return true; + } + private async Task PopulateAsync(string searchText, CancellationToken cancellationToken) + { + + try + { + IEnumerable result = await _asyncPopulator.Invoke(searchText, cancellationToken); + var resultList = result.ToList(); + + if (cancellationToken.IsCancellationRequested) + { + return; + } + + await Dispatcher.UIThread.InvokeAsync(() => + { + if (!cancellationToken.IsCancellationRequested) + { + Items = resultList; + PopulateComplete(); + } + }); + } + catch (TaskCanceledException) + { } + finally + { + _populationCancellationTokenSource?.Dispose(); + _populationCancellationTokenSource = null; + } + + } + + /// + /// Private method that directly opens the popup, checks the expander + /// button, and then fires the Opened event. + /// + private void OpenDropDown() + { + if (DropDownPopup != null) + { + DropDownPopup.IsOpen = true; + } + _popupHasOpened = true; + OnDropDownOpened(EventArgs.Empty); + } + + /// + /// Private method that directly closes the popup, flips the Checked + /// value, and then fires the Closed event. + /// + private void CloseDropDown() + { + if (_popupHasOpened) + { + if (SelectionAdapter != null) + { + SelectionAdapter.SelectedItem = null; + } + if (DropDownPopup != null) + { + DropDownPopup.IsOpen = false; + } + OnDropDownClosed(EventArgs.Empty); + } + } + + /// + /// Formats an Item for text comparisons based on Converter + /// and ConverterCulture properties. + /// + /// The object to format. + /// A value indicating whether to clear + /// the data context after the lookup is performed. + /// Formatted Value. + private string FormatValue(object value, bool clearDataContext) + { + string result = FormatValue(value); + if(clearDataContext && _valueBindingEvaluator != null) + { + _valueBindingEvaluator.ClearDataContext(); + } + + return result; + } + + /// + /// Converts the specified object to a string by using the + /// and + /// values + /// of the binding object specified by the + /// + /// property. + /// + /// The object to format as a string. + /// The string representation of the specified object. + /// + /// Override this method to provide a custom string conversion. + /// + protected virtual string FormatValue(object value) + { + if (_valueBindingEvaluator != null) + { + return _valueBindingEvaluator.GetDynamicValue(value) ?? String.Empty; + } + + if (_valueMemberSelector != null) + { + value = _valueMemberSelector.Select(value); + } + + return value == null ? String.Empty : value.ToString(); + } + + /// + /// Handle the TextChanged event that is directly attached to the + /// TextBox part. This ensures that only user initiated actions will + /// result in an AutoCompleteBox suggestion and operation. + /// + private void OnTextBoxTextChanged() + { + //Uses Dispatcher.Post to allow the TextBox selection to update before processing + Dispatcher.UIThread.Post(() => + { + // Call the central updated text method as a user-initiated action + TextUpdated(_textBox.Text, true); + }); + } + + /// + /// Updates both the text box value and underlying text dependency + /// property value if and when they change. Automatically fires the + /// text changed events when there is a change. + /// + /// The new string value. + private void UpdateTextValue(string value) + { + UpdateTextValue(value, null); + } + + /// + /// Updates both the text box value and underlying text dependency + /// property value if and when they change. Automatically fires the + /// text changed events when there is a change. + /// + /// The new string value. + /// A nullable bool value indicating whether + /// the action was user initiated. In a user initiated mode, the + /// underlying text dependency property is updated. In a non-user + /// interaction, the text box value is updated. When user initiated is + /// null, all values are updated. + private void UpdateTextValue(string value, bool? userInitiated) + { + bool callTextChanged = false; + // Update the Text dependency property + if ((userInitiated == null || userInitiated == true) && Text != value) + { + _ignoreTextPropertyChange++; + Text = value; + callTextChanged = true; + } + + // Update the TextBox's Text dependency property + if ((userInitiated == null || userInitiated == false) && TextBox != null && TextBox.Text != value) + { + _ignoreTextPropertyChange++; + TextBox.Text = value ?? string.Empty; + + // Text dependency property value was set, fire event + if (!callTextChanged && (Text == value || Text == null)) + { + callTextChanged = true; + } + } + + if (callTextChanged) + { + OnTextChanged(new RoutedEventArgs()); + } + } + + /// + /// Handle the update of the text for the control from any source, + /// including the TextBox part and the Text dependency property. + /// + /// The new text. + /// A value indicating whether the update + /// is a user-initiated action. This should be a True value when the + /// TextUpdated method is called from a TextBox event handler. + private void TextUpdated(string newText, bool userInitiated) + { + // Only process this event if it is coming from someone outside + // setting the Text dependency property directly. + if (_ignoreTextPropertyChange > 0) + { + _ignoreTextPropertyChange--; + return; + } + + if (newText == null) + { + newText = string.Empty; + } + + // The TextBox.TextChanged event was not firing immediately and + // was causing an immediate update, even with wrapping. If there is + // a selection currently, no update should happen. + if (IsTextCompletionEnabled && TextBox != null && TextBoxSelectionLength > 0 && TextBoxSelectionStart != TextBox.Text.Length) + { + return; + } + + // Evaluate the conditions needed for completion. + // 1. Minimum prefix length + // 2. If a delay timer is in use, use it + bool populateReady = newText.Length >= MinimumPrefixLength && MinimumPrefixLength >= 0; + _userCalledPopulate = populateReady ? userInitiated : false; + + // Update the interface and values only as necessary + UpdateTextValue(newText, userInitiated); + + if (populateReady) + { + _ignoreTextSelectionChange = true; + + if (_delayTimer != null) + { + _delayTimer.Start(); + } + else + { + PopulateDropDown(this, EventArgs.Empty); + } + } + else + { + SearchText = string.Empty; + if (SelectedItem != null) + { + _skipSelectedItemTextUpdate = true; + } + SelectedItem = null; + if (IsDropDownOpen) + { + IsDropDownOpen = false; + } + } + } + + /// + /// A simple helper method to clear the view and ensure that a view + /// object is always present and not null. + /// + private void ClearView() + { + if (_view == null) + { + _view = new AvaloniaList(); + } + else + { + _view.Clear(); + } + } + + /// + /// Walks through the items enumeration. Performance is not going to be + /// perfect with the current implementation. + /// + private void RefreshView() + { + if (_items == null) + { + ClearView(); + return; + } + + // Cache the current text value + string text = Text ?? string.Empty; + + // Determine if any filtering mode is on + bool stringFiltering = TextFilter != null; + bool objectFiltering = FilterMode == AutoCompleteFilterMode.Custom && TextFilter == null; + + int view_index = 0; + int view_count = _view.Count; + List items = _items; + foreach (object item in items) + { + bool inResults = !(stringFiltering || objectFiltering); + if (!inResults) + { + inResults = stringFiltering ? TextFilter(text, FormatValue(item)) : ItemFilter(text, item); + } + + if (view_count > view_index && inResults && _view[view_index] == item) + { + // Item is still in the view + view_index++; + } + else if (inResults) + { + // Insert the item + if (view_count > view_index && _view[view_index] != item) + { + // Replace item + // Unfortunately replacing via index throws a fatal + // exception: View[view_index] = item; + // Cost: O(n) vs O(1) + _view.RemoveAt(view_index); + _view.Insert(view_index, item); + view_index++; + } + else + { + // Add the item + if (view_index == view_count) + { + // Constant time is preferred (Add). + _view.Add(item); + } + else + { + _view.Insert(view_index, item); + } + view_index++; + view_count++; + } + } + else if (view_count > view_index && _view[view_index] == item) + { + // Remove the item + _view.RemoveAt(view_index); + view_count--; + } + } + + // Clear the evaluator to discard a reference to the last item + if (_valueBindingEvaluator != null) + { + _valueBindingEvaluator.ClearDataContext(); + } + } + + /// + /// Handle any change to the ItemsSource dependency property, update + /// the underlying ObservableCollection view, and set the selection + /// adapter's ItemsSource to the view if appropriate. + /// + /// The new enumerable reference. + private void OnItemsChanged(IEnumerable newValue) + { + // Remove handler for oldValue.CollectionChanged (if present) + _collectionChangeSubscription?.Dispose(); + _collectionChangeSubscription = null; + + // Add handler for newValue.CollectionChanged (if possible) + if (newValue is INotifyCollectionChanged newValueINotifyCollectionChanged) + { + _collectionChangeSubscription = newValueINotifyCollectionChanged.WeakSubscribe(ItemsCollectionChanged); + } + + // Store a local cached copy of the data + _items = newValue == null ? null : new List(newValue.Cast().ToList()); + + // Clear and set the view on the selection adapter + ClearView(); + if (SelectionAdapter != null && SelectionAdapter.Items != _view) + { + SelectionAdapter.Items = _view; + } + if (IsDropDownOpen) + { + RefreshView(); + } + } + + /// + /// Method that handles the ObservableCollection.CollectionChanged event for the ItemsSource property. + /// + /// The object that raised the event. + /// The event data. + private void ItemsCollectionChanged(object sender, NotifyCollectionChangedEventArgs e) + { + // Update the cache + if (e.Action == NotifyCollectionChangedAction.Remove && e.OldItems != null) + { + for (int index = 0; index < e.OldItems.Count; index++) + { + _items.RemoveAt(e.OldStartingIndex); + } + } + if (e.Action == NotifyCollectionChangedAction.Add && e.NewItems != null && _items.Count >= e.NewStartingIndex) + { + for (int index = 0; index < e.NewItems.Count; index++) + { + _items.Insert(e.NewStartingIndex + index, e.NewItems[index]); + } + } + if (e.Action == NotifyCollectionChangedAction.Replace && e.NewItems != null && e.OldItems != null) + { + for (int index = 0; index < e.NewItems.Count; index++) + { + _items[e.NewStartingIndex] = e.NewItems[index]; + } + } + + // Update the view + if (e.Action == NotifyCollectionChangedAction.Remove || e.Action == NotifyCollectionChangedAction.Replace) + { + for (int index = 0; index < e.OldItems.Count; index++) + { + _view.Remove(e.OldItems[index]); + } + } + + if (e.Action == NotifyCollectionChangedAction.Reset) + { + // Significant changes to the underlying data. + ClearView(); + if (Items != null) + { + _items = new List(Items.Cast().ToList()); + } + } + + // Refresh the observable collection used in the selection adapter. + RefreshView(); + } + + /// + /// Notifies the + /// that the + /// + /// property has been set and the data can be filtered to provide + /// possible matches in the drop-down. + /// + /// + /// Call this method when you are providing custom population of + /// the drop-down portion of the AutoCompleteBox, to signal the control + /// that you are done with the population process. + /// Typically, you use PopulateComplete when the population process + /// is a long-running process and you want to cancel built-in filtering + /// of the ItemsSource items. In this case, you can handle the + /// Populated event and set PopulatingEventArgs.Cancel to true. + /// When the long-running process has completed you call + /// PopulateComplete to indicate the drop-down is populated. + /// + public void PopulateComplete() + { + // Apply the search filter + RefreshView(); + + // Fire the Populated event containing the read-only view data. + PopulatedEventArgs populated = new PopulatedEventArgs(new ReadOnlyCollection(_view)); + OnPopulated(populated); + + if (SelectionAdapter != null && SelectionAdapter.Items != _view) + { + SelectionAdapter.Items = _view; + } + + bool isDropDownOpen = _userCalledPopulate && (_view.Count > 0); + if (isDropDownOpen != IsDropDownOpen) + { + _ignorePropertyChange = true; + IsDropDownOpen = isDropDownOpen; + } + if (IsDropDownOpen) + { + OpeningDropDown(false); + } + else + { + ClosingDropDown(true); + } + + UpdateTextCompletion(_userCalledPopulate); + } + + /// + /// Performs text completion, if enabled, and a lookup on the underlying + /// item values for an exact match. Will update the SelectedItem value. + /// + /// A value indicating whether the operation + /// was user initiated. Text completion will not be performed when not + /// directly initiated by the user. + private void UpdateTextCompletion(bool userInitiated) + { + // By default this method will clear the selected value + object newSelectedItem = null; + string text = Text; + + // Text search is StartsWith explicit and only when enabled, in + // line with WPF's ComboBox lookup. When in use it will associate + // a Value with the Text if it is found in ItemsSource. This is + // only valid when there is data and the user initiated the action. + if (_view.Count > 0) + { + if (IsTextCompletionEnabled && TextBox != null && userInitiated) + { + int currentLength = TextBox.Text.Length; + int selectionStart = TextBoxSelectionStart; + if (selectionStart == text.Length && selectionStart > _textSelectionStart) + { + // When the FilterMode dependency property is set to + // either StartsWith or StartsWithCaseSensitive, the + // first item in the view is used. This will improve + // performance on the lookup. It assumes that the + // FilterMode the user has selected is an acceptable + // case sensitive matching function for their scenario. + object top = FilterMode == AutoCompleteFilterMode.StartsWith || FilterMode == AutoCompleteFilterMode.StartsWithCaseSensitive + ? _view[0] + : TryGetMatch(text, _view, AutoCompleteSearch.GetFilter(AutoCompleteFilterMode.StartsWith)); + + // If the search was successful, update SelectedItem + if (top != null) + { + newSelectedItem = top; + string topString = FormatValue(top, true); + + // Only replace partially when the two words being the same + int minLength = Math.Min(topString.Length, Text.Length); + if (AutoCompleteSearch.Equals(Text.Substring(0, minLength), topString.Substring(0, minLength))) + { + // Update the text + UpdateTextValue(topString); + + // Select the text past the user's caret + TextBox.SelectionStart = currentLength; + TextBox.SelectionEnd = topString.Length; + } + } + } + } + else + { + // Perform an exact string lookup for the text. This is a + // design change from the original Toolkit release when the + // IsTextCompletionEnabled property behaved just like the + // WPF ComboBox's IsTextSearchEnabled property. + // + // This change provides the behavior that most people expect + // to find: a lookup for the value is always performed. + newSelectedItem = TryGetMatch(text, _view, AutoCompleteSearch.GetFilter(AutoCompleteFilterMode.EqualsCaseSensitive)); + } + } + + // Update the selected item property + + if (SelectedItem != newSelectedItem) + { + _skipSelectedItemTextUpdate = true; + } + SelectedItem = newSelectedItem; + + // Restore updates for TextSelection + if (_ignoreTextSelectionChange) + { + _ignoreTextSelectionChange = false; + if (TextBox != null) + { + _textSelectionStart = TextBoxSelectionStart; + } + } + } + + /// + /// Attempts to look through the view and locate the specific exact + /// text match. + /// + /// The search text. + /// The view reference. + /// The predicate to use for the partial or + /// exact match. + /// Returns the object or null. + private object TryGetMatch(string searchText, AvaloniaList view, AutoCompleteFilterPredicate predicate) + { + if (view != null && view.Count > 0) + { + foreach (object o in view) + { + if (predicate(searchText, FormatValue(o))) + { + return o; + } + } + } + + return null; + } + + private void UpdatePseudoClasses() + { + PseudoClasses.Set(":dropdownopen", IsDropDownOpen); + } + + private void ClearTextBoxSelection() + { + if (TextBox != null) + { + int length = TextBox.Text?.Length ?? 0; + TextBox.SelectionStart = length; + TextBox.SelectionEnd = length; + } + } + + /// + /// Called when the selected item is changed, updates the text value + /// that is displayed in the text box part. + /// + /// The new item. + private void OnSelectedItemChanged(object newItem) + { + string text; + + if (newItem == null) + { + text = SearchText; + } + else + { + text = FormatValue(newItem, true); + } + + // Update the Text property and the TextBox values + UpdateTextValue(text); + + // Move the caret to the end of the text box + ClearTextBoxSelection(); + } + + /// + /// Handles the SelectionChanged event of the selection adapter. + /// + /// The source object. + /// The selection changed event data. + private void OnAdapterSelectionChanged(object sender, SelectionChangedEventArgs e) + { + SelectedItem = _adapter.SelectedItem; + } + + //TODO Check UpdateTextCompletion + /// + /// Handles the Commit event on the selection adapter. + /// + /// The source object. + /// The event data. + private void OnAdapterSelectionComplete(object sender, RoutedEventArgs e) + { + IsDropDownOpen = false; + + // Completion will update the selected value + //UpdateTextCompletion(false); + + // Text should not be selected + ClearTextBoxSelection(); + + TextBox.Focus(); + } + + /// + /// Handles the Cancel event on the selection adapter. + /// + /// The source object. + /// The event data. + private void OnAdapterSelectionCanceled(object sender, RoutedEventArgs e) + { + UpdateTextValue(SearchText); + + // Completion will update the selected value + UpdateTextCompletion(false); + } + + /// + /// A predefined set of filter functions for the known, built-in + /// AutoCompleteFilterMode enumeration values. + /// + private static class AutoCompleteSearch + { + /// + /// Index function that retrieves the filter for the provided + /// AutoCompleteFilterMode. + /// + /// The built-in search mode. + /// Returns the string-based comparison function. + public static AutoCompleteFilterPredicate GetFilter(AutoCompleteFilterMode FilterMode) + { + switch (FilterMode) + { + case AutoCompleteFilterMode.Contains: + return Contains; + + case AutoCompleteFilterMode.ContainsCaseSensitive: + return ContainsCaseSensitive; + + case AutoCompleteFilterMode.ContainsOrdinal: + return ContainsOrdinal; + + case AutoCompleteFilterMode.ContainsOrdinalCaseSensitive: + return ContainsOrdinalCaseSensitive; + + case AutoCompleteFilterMode.Equals: + return Equals; + + case AutoCompleteFilterMode.EqualsCaseSensitive: + return EqualsCaseSensitive; + + case AutoCompleteFilterMode.EqualsOrdinal: + return EqualsOrdinal; + + case AutoCompleteFilterMode.EqualsOrdinalCaseSensitive: + return EqualsOrdinalCaseSensitive; + + case AutoCompleteFilterMode.StartsWith: + return StartsWith; + + case AutoCompleteFilterMode.StartsWithCaseSensitive: + return StartsWithCaseSensitive; + + case AutoCompleteFilterMode.StartsWithOrdinal: + return StartsWithOrdinal; + + case AutoCompleteFilterMode.StartsWithOrdinalCaseSensitive: + return StartsWithOrdinalCaseSensitive; + + case AutoCompleteFilterMode.None: + case AutoCompleteFilterMode.Custom: + default: + return null; + } + } + + /// + /// An implementation of the Contains member of string that takes in a + /// string comparison. The traditional .NET string Contains member uses + /// StringComparison.Ordinal. + /// + /// The string. + /// The string value to search for. + /// The string comparison type. + /// Returns true when the substring is found. + private static bool Contains(string s, string value, StringComparison comparison) + { + return s.IndexOf(value, comparison) >= 0; + } + + /// + /// Check if the string value begins with the text. + /// + /// The AutoCompleteBox prefix text. + /// The item's string value. + /// Returns true if the condition is met. + public static bool StartsWith(string text, string value) + { + return value.StartsWith(text, StringComparison.CurrentCultureIgnoreCase); + } + + /// + /// Check if the string value begins with the text. + /// + /// The AutoCompleteBox prefix text. + /// The item's string value. + /// Returns true if the condition is met. + public static bool StartsWithCaseSensitive(string text, string value) + { + return value.StartsWith(text, StringComparison.CurrentCulture); + } + + /// + /// Check if the string value begins with the text. + /// + /// The AutoCompleteBox prefix text. + /// The item's string value. + /// Returns true if the condition is met. + public static bool StartsWithOrdinal(string text, string value) + { + return value.StartsWith(text, StringComparison.OrdinalIgnoreCase); + } + + /// + /// Check if the string value begins with the text. + /// + /// The AutoCompleteBox prefix text. + /// The item's string value. + /// Returns true if the condition is met. + public static bool StartsWithOrdinalCaseSensitive(string text, string value) + { + return value.StartsWith(text, StringComparison.Ordinal); + } + + /// + /// Check if the prefix is contained in the string value. The current + /// culture's case insensitive string comparison operator is used. + /// + /// The AutoCompleteBox prefix text. + /// The item's string value. + /// Returns true if the condition is met. + public static bool Contains(string text, string value) + { + return Contains(value, text, StringComparison.CurrentCultureIgnoreCase); + } + + /// + /// Check if the prefix is contained in the string value. + /// + /// The AutoCompleteBox prefix text. + /// The item's string value. + /// Returns true if the condition is met. + public static bool ContainsCaseSensitive(string text, string value) + { + return Contains(value, text, StringComparison.CurrentCulture); + } + + /// + /// Check if the prefix is contained in the string value. + /// + /// The AutoCompleteBox prefix text. + /// The item's string value. + /// Returns true if the condition is met. + public static bool ContainsOrdinal(string text, string value) + { + return Contains(value, text, StringComparison.OrdinalIgnoreCase); + } + + /// + /// Check if the prefix is contained in the string value. + /// + /// The AutoCompleteBox prefix text. + /// The item's string value. + /// Returns true if the condition is met. + public static bool ContainsOrdinalCaseSensitive(string text, string value) + { + return Contains(value, text, StringComparison.Ordinal); + } + + /// + /// Check if the string values are equal. + /// + /// The AutoCompleteBox prefix text. + /// The item's string value. + /// Returns true if the condition is met. + public static bool Equals(string text, string value) + { + return value.Equals(text, StringComparison.CurrentCultureIgnoreCase); + } + + /// + /// Check if the string values are equal. + /// + /// The AutoCompleteBox prefix text. + /// The item's string value. + /// Returns true if the condition is met. + public static bool EqualsCaseSensitive(string text, string value) + { + return value.Equals(text, StringComparison.CurrentCulture); + } + + /// + /// Check if the string values are equal. + /// + /// The AutoCompleteBox prefix text. + /// The item's string value. + /// Returns true if the condition is met. + public static bool EqualsOrdinal(string text, string value) + { + return value.Equals(text, StringComparison.OrdinalIgnoreCase); + } + + /// + /// Check if the string values are equal. + /// + /// The AutoCompleteBox prefix text. + /// The item's string value. + /// Returns true if the condition is met. + public static bool EqualsOrdinalCaseSensitive(string text, string value) + { + return value.Equals(text, StringComparison.Ordinal); + } + } + + /// + /// A framework element that permits a binding to be evaluated in a new data + /// context leaf node. + /// + /// The type of dynamic binding to return. + public class BindingEvaluator : Control + { + /// + /// Gets or sets the string value binding used by the control. + /// + private IBinding _binding; + + #region public T Value + + /// + /// Identifies the Value dependency property. + /// + public static readonly StyledProperty ValueProperty = + AvaloniaProperty.Register, T>(nameof(Value)); + + /// + /// Gets or sets the data item value. + /// + public T Value + { + get { return GetValue(ValueProperty); } + set { SetValue(ValueProperty, value); } + } + + #endregion public string Value + + /// + /// Gets or sets the value binding. + /// + public IBinding ValueBinding + { + get { return _binding; } + set + { + _binding = value; + AvaloniaObjectExtensions.Bind(this, ValueProperty, value); + } + } + + /// + /// Initializes a new instance of the BindingEvaluator class. + /// + public BindingEvaluator() + { } + + /// + /// Initializes a new instance of the BindingEvaluator class, + /// setting the initial binding to the provided parameter. + /// + /// The initial string value binding. + public BindingEvaluator(IBinding binding) + : this() + { + ValueBinding = binding; + } + + /// + /// Clears the data context so that the control does not keep a + /// reference to the last-looked up item. + /// + public void ClearDataContext() + { + DataContext = null; + } + + /// + /// Updates the data context of the framework element and returns the + /// updated binding value. + /// + /// The object to use as the data context. + /// If set to true, this parameter will + /// clear the data context immediately after retrieving the value. + /// Returns the evaluated T value of the bound dependency + /// property. + public T GetDynamicValue(object o, bool clearDataContext) + { + DataContext = o; + T value = Value; + if (clearDataContext) + { + DataContext = null; + } + return value; + } + + /// + /// Updates the data context of the framework element and returns the + /// updated binding value. + /// + /// The object to use as the data context. + /// Returns the evaluated T value of the bound dependency + /// property. + public T GetDynamicValue(object o) + { + DataContext = o; + return Value; + } + } + } +} diff --git a/src/Avalonia.Controls/TextBox.cs b/src/Avalonia.Controls/TextBox.cs index a17a072f19..34c6b1cfd6 100644 --- a/src/Avalonia.Controls/TextBox.cs +++ b/src/Avalonia.Controls/TextBox.cs @@ -812,7 +812,7 @@ namespace Avalonia.Controls int pos = 0; int i; - for (i = 0; i < lines.Count; ++i) + for (i = 0; i < lines.Count - 1; ++i) { var line = lines[i]; pos += line.Length; diff --git a/src/Avalonia.Controls/Utils/ISelectionAdapter.cs b/src/Avalonia.Controls/Utils/ISelectionAdapter.cs new file mode 100644 index 0000000000..3c1006a12e --- /dev/null +++ b/src/Avalonia.Controls/Utils/ISelectionAdapter.cs @@ -0,0 +1,64 @@ +// (c) Copyright Microsoft Corporation. +// This source is subject to the Microsoft Public License (Ms-PL). +// Please see http://go.microsoft.com/fwlink/?LinkID=131993 for details. +// All other rights reserved. + +using System; +using System.Collections; +using Avalonia.Interactivity; +using Avalonia.Input; + +namespace Avalonia.Controls.Utils +{ + /// + /// Defines an item collection, selection members, and key handling for the + /// selection adapter contained in the drop-down portion of an + /// control. + /// + public interface ISelectionAdapter + { + /// + /// Gets or sets the selected item. + /// + /// The currently selected item. + object SelectedItem { get; set; } + + /// + /// Occurs when the + /// + /// property value changes. + /// + event EventHandler SelectionChanged; + + /// + /// Gets or sets a collection that is used to generate content for the + /// selection adapter. + /// + /// The collection that is used to generate content for the + /// selection adapter. + IEnumerable Items { get; set; } + + /// + /// Occurs when a selected item is not cancelled and is committed as the + /// selected item. + /// + event EventHandler Commit; + + /// + /// Occurs when a selection has been canceled. + /// + event EventHandler Cancel; + + /// + /// Provides handling for the + /// event that occurs + /// when a key is pressed while the drop-down portion of the + /// has focus. + /// + /// A + /// that contains data about the + /// event. + void HandleKeyDown(KeyEventArgs e); + } + +} diff --git a/src/Avalonia.Controls/Utils/SelectingItemsControlSelectionAdapter.cs b/src/Avalonia.Controls/Utils/SelectingItemsControlSelectionAdapter.cs new file mode 100644 index 0000000000..43c8a5aa6c --- /dev/null +++ b/src/Avalonia.Controls/Utils/SelectingItemsControlSelectionAdapter.cs @@ -0,0 +1,342 @@ +// (c) Copyright Microsoft Corporation. +// This source is subject to the Microsoft Public License (Ms-PL). +// Please see http://go.microsoft.com/fwlink/?LinkID=131993 for details. +// All other rights reserved. + +using System; +using System.Linq; +using System.Collections.Generic; +using System.Text; +using Avalonia.Controls.Primitives; +using Avalonia.Interactivity; +using Avalonia.Input; +using Avalonia.LogicalTree; +using System.Collections; +using System.Diagnostics; + +namespace Avalonia.Controls.Utils +{ + /// + /// Represents the selection adapter contained in the drop-down portion of + /// an control. + /// + public class SelectingItemsControlSelectionAdapter : ISelectionAdapter + { + /// + /// The SelectingItemsControl instance. + /// + private SelectingItemsControl _selector; + + /// + /// Gets or sets a value indicating whether the selection change event + /// should not be fired. + /// + private bool IgnoringSelectionChanged { get; set; } + + /// + /// Gets or sets the underlying + /// + /// control. + /// + /// The underlying + /// + /// control. + public SelectingItemsControl SelectorControl + { + get { return _selector; } + + set + { + if (_selector != null) + { + _selector.SelectionChanged -= OnSelectionChanged; + _selector.PointerReleased -= OnSelectorPointerReleased; + } + + _selector = value; + + if (_selector != null) + { + _selector.SelectionChanged += OnSelectionChanged; + _selector.PointerReleased += OnSelectorPointerReleased; + } + } + } + + /// + /// Occurs when the + /// + /// property value changes. + /// + public event EventHandler SelectionChanged; + + /// + /// Occurs when an item is selected and is committed to the underlying + /// + /// control. + /// + public event EventHandler Commit; + + /// + /// Occurs when a selection is canceled before it is committed. + /// + public event EventHandler Cancel; + + /// + /// Initializes a new instance of the + /// + /// class. + /// + public SelectingItemsControlSelectionAdapter() + { + + } + + /// + /// Initializes a new instance of the + /// + /// class with the specified + /// + /// control. + /// + /// The + /// control + /// to wrap as a + /// . + public SelectingItemsControlSelectionAdapter(SelectingItemsControl selector) + { + SelectorControl = selector; + } + + /// + /// Gets or sets the selected item of the selection adapter. + /// + /// The selected item of the underlying selection adapter. + public object SelectedItem + { + get + { + return SelectorControl?.SelectedItem; + } + + set + { + IgnoringSelectionChanged = true; + if (SelectorControl != null) + { + SelectorControl.SelectedItem = value; + } + + // Attempt to reset the scroll viewer's position + if (value == null) + { + ResetScrollViewer(); + } + + IgnoringSelectionChanged = false; + } + } + + /// + /// Gets or sets a collection that is used to generate the content of + /// the selection adapter. + /// + /// The collection used to generate content for the selection + /// adapter. + public IEnumerable Items + { + get + { + return SelectorControl?.Items; + } + set + { + if (SelectorControl != null) + { + SelectorControl.Items = value; + } + } + } + + /// + /// If the control contains a ScrollViewer, this will reset the viewer + /// to be scrolled to the top. + /// + private void ResetScrollViewer() + { + if (SelectorControl != null) + { + ScrollViewer sv = SelectorControl.GetLogicalDescendants().OfType().FirstOrDefault(); + if (sv != null) + { + sv.Offset = new Vector(0, 0); + } + } + } + + /// + /// Handles the mouse left button up event on the selector control. + /// + /// The source object. + /// The event data. + private void OnSelectorPointerReleased(object sender, PointerReleasedEventArgs e) + { + if (e.MouseButton == MouseButton.Left) + { + OnCommit(); + } + } + + /// + /// Handles the SelectionChanged event on the SelectingItemsControl control. + /// + /// The source object. + /// The selection changed event data. + private void OnSelectionChanged(object sender, SelectionChangedEventArgs e) + { + if (IgnoringSelectionChanged) + { + return; + } + + SelectionChanged?.Invoke(sender, e); + } + + /// + /// Increments the + /// + /// property of the underlying + /// + /// control. + /// + protected void SelectedIndexIncrement() + { + if (SelectorControl != null) + { + SelectorControl.SelectedIndex = SelectorControl.SelectedIndex + 1 >= SelectorControl.ItemCount ? -1 : SelectorControl.SelectedIndex + 1; + } + } + + /// + /// Decrements the + /// + /// property of the underlying + /// + /// control. + /// + protected void SelectedIndexDecrement() + { + if (SelectorControl != null) + { + int index = SelectorControl.SelectedIndex; + if (index >= 0) + { + SelectorControl.SelectedIndex--; + } + else if (index == -1) + { + SelectorControl.SelectedIndex = SelectorControl.ItemCount - 1; + } + } + } + + /// + /// Provides handling for the + /// event that occurs + /// when a key is pressed while the drop-down portion of the + /// has focus. + /// + /// A + /// that contains data about the + /// event. + public void HandleKeyDown(KeyEventArgs e) + { + switch (e.Key) + { + case Key.Enter: + OnCommit(); + e.Handled = true; + break; + + case Key.Up: + SelectedIndexDecrement(); + e.Handled = true; + break; + + case Key.Down: + if ((e.Modifiers & InputModifiers.Alt) == InputModifiers.None) + { + SelectedIndexIncrement(); + e.Handled = true; + } + break; + + case Key.Escape: + OnCancel(); + e.Handled = true; + break; + + default: + break; + } + } + + /// + /// Raises the + /// + /// event. + /// + protected virtual void OnCommit() + { + OnCommit(this, new RoutedEventArgs()); + } + + /// + /// Fires the Commit event. + /// + /// The source object. + /// The event data. + private void OnCommit(object sender, RoutedEventArgs e) + { + Commit?.Invoke(sender, e); + + AfterAdapterAction(); + } + + /// + /// Raises the + /// + /// event. + /// + protected virtual void OnCancel() + { + OnCancel(this, new RoutedEventArgs()); + } + + /// + /// Fires the Cancel event. + /// + /// The source object. + /// The event data. + private void OnCancel(object sender, RoutedEventArgs e) + { + Cancel?.Invoke(sender, e); + + AfterAdapterAction(); + } + + /// + /// Change the selection after the actions are complete. + /// + private void AfterAdapterAction() + { + IgnoringSelectionChanged = true; + if (SelectorControl != null) + { + SelectorControl.SelectedItem = null; + SelectorControl.SelectedIndex = -1; + } + IgnoringSelectionChanged = false; + } + } +} diff --git a/src/Avalonia.Input/KeyboardDevice.cs b/src/Avalonia.Input/KeyboardDevice.cs index d815f8082b..2a1cdec1c0 100644 --- a/src/Avalonia.Input/KeyboardDevice.cs +++ b/src/Avalonia.Input/KeyboardDevice.cs @@ -46,13 +46,13 @@ namespace Avalonia.Input if (element != FocusedElement) { var interactive = FocusedElement as IInteractive; + FocusedElement = element; interactive?.RaiseEvent(new RoutedEventArgs { RoutedEvent = InputElement.LostFocusEvent, }); - FocusedElement = element; interactive = element as IInteractive; interactive?.RaiseEvent(new GotFocusEventArgs diff --git a/src/Avalonia.Themes.Default/AutoCompleteBox.xaml b/src/Avalonia.Themes.Default/AutoCompleteBox.xaml new file mode 100644 index 0000000000..82dbf6064b --- /dev/null +++ b/src/Avalonia.Themes.Default/AutoCompleteBox.xaml @@ -0,0 +1,43 @@ + + + + + \ No newline at end of file diff --git a/src/Avalonia.Themes.Default/DefaultTheme.xaml b/src/Avalonia.Themes.Default/DefaultTheme.xaml index aa1a3c6385..2b9132ee56 100644 --- a/src/Avalonia.Themes.Default/DefaultTheme.xaml +++ b/src/Avalonia.Themes.Default/DefaultTheme.xaml @@ -23,7 +23,7 @@ - + @@ -44,4 +44,5 @@ + diff --git a/src/Avalonia.Visuals/Media/GradientBrush.cs b/src/Avalonia.Visuals/Media/GradientBrush.cs index 8c2c9a2c01..fb29f68373 100644 --- a/src/Avalonia.Visuals/Media/GradientBrush.cs +++ b/src/Avalonia.Visuals/Media/GradientBrush.cs @@ -22,7 +22,7 @@ namespace Avalonia.Media /// Defines the property. /// public static readonly StyledProperty> GradientStopsProperty = - AvaloniaProperty.Register>(nameof(Opacity)); + AvaloniaProperty.Register>(nameof(GradientStops)); /// /// Initializes a new instance of the class. diff --git a/tests/Avalonia.Controls.UnitTests/AutoCompleteBoxTests.cs b/tests/Avalonia.Controls.UnitTests/AutoCompleteBoxTests.cs new file mode 100644 index 0000000000..f9da2ab6f3 --- /dev/null +++ b/tests/Avalonia.Controls.UnitTests/AutoCompleteBoxTests.cs @@ -0,0 +1,1042 @@ +// Copyright (c) The Avalonia Project. All rights reserved. +// Licensed under the MIT license. See licence.md file in the project root for full license information. + +using System; +using System.Collections; +using System.Collections.Generic; +using System.ComponentModel; +using System.Linq; +using Avalonia.Controls.Primitives; +using Avalonia.Controls.Presenters; +using Avalonia.Controls.Templates; +using Avalonia.Data; +using Avalonia.Markup.Xaml.Data; +using Avalonia.Platform; +using Avalonia.Threading; +using Avalonia.UnitTests; +using Moq; +using Xunit; +using System.Collections.ObjectModel; + +namespace Avalonia.Controls.UnitTests +{ + public class AutoCompleteBoxTests + { + [Fact] + public void Search_Filters() + { + Assert.True(GetFilter(AutoCompleteFilterMode.Contains)("am", "name")); + Assert.True(GetFilter(AutoCompleteFilterMode.Contains)("AME", "name")); + Assert.False(GetFilter(AutoCompleteFilterMode.Contains)("hello", "name")); + + Assert.True(GetFilter(AutoCompleteFilterMode.ContainsCaseSensitive)("na", "name")); + Assert.False(GetFilter(AutoCompleteFilterMode.ContainsCaseSensitive)("AME", "name")); + Assert.False(GetFilter(AutoCompleteFilterMode.ContainsCaseSensitive)("hello", "name")); + + Assert.Null(GetFilter(AutoCompleteFilterMode.Custom)); + Assert.Null(GetFilter(AutoCompleteFilterMode.None)); + + Assert.True(GetFilter(AutoCompleteFilterMode.Equals)("na", "na")); + Assert.True(GetFilter(AutoCompleteFilterMode.Equals)("na", "NA")); + Assert.False(GetFilter(AutoCompleteFilterMode.Equals)("hello", "name")); + + Assert.True(GetFilter(AutoCompleteFilterMode.EqualsCaseSensitive)("na", "na")); + Assert.False(GetFilter(AutoCompleteFilterMode.EqualsCaseSensitive)("na", "NA")); + Assert.False(GetFilter(AutoCompleteFilterMode.EqualsCaseSensitive)("hello", "name")); + + Assert.True(GetFilter(AutoCompleteFilterMode.StartsWith)("na", "name")); + Assert.True(GetFilter(AutoCompleteFilterMode.StartsWith)("NAM", "name")); + Assert.False(GetFilter(AutoCompleteFilterMode.StartsWith)("hello", "name")); + + Assert.True(GetFilter(AutoCompleteFilterMode.StartsWithCaseSensitive)("na", "name")); + Assert.False(GetFilter(AutoCompleteFilterMode.StartsWithCaseSensitive)("NAM", "name")); + Assert.False(GetFilter(AutoCompleteFilterMode.StartsWithCaseSensitive)("hello", "name")); + } + + [Fact] + public void Ordinal_Search_Filters() + { + Assert.True(GetFilter(AutoCompleteFilterMode.ContainsOrdinal)("am", "name")); + Assert.True(GetFilter(AutoCompleteFilterMode.ContainsOrdinal)("AME", "name")); + Assert.False(GetFilter(AutoCompleteFilterMode.ContainsOrdinal)("hello", "name")); + + Assert.True(GetFilter(AutoCompleteFilterMode.ContainsOrdinalCaseSensitive)("na", "name")); + Assert.False(GetFilter(AutoCompleteFilterMode.ContainsOrdinalCaseSensitive)("AME", "name")); + Assert.False(GetFilter(AutoCompleteFilterMode.ContainsOrdinalCaseSensitive)("hello", "name")); + + Assert.True(GetFilter(AutoCompleteFilterMode.EqualsOrdinal)("na", "na")); + Assert.True(GetFilter(AutoCompleteFilterMode.EqualsOrdinal)("na", "NA")); + Assert.False(GetFilter(AutoCompleteFilterMode.EqualsOrdinal)("hello", "name")); + + Assert.True(GetFilter(AutoCompleteFilterMode.EqualsOrdinalCaseSensitive)("na", "na")); + Assert.False(GetFilter(AutoCompleteFilterMode.EqualsOrdinalCaseSensitive)("na", "NA")); + Assert.False(GetFilter(AutoCompleteFilterMode.EqualsOrdinalCaseSensitive)("hello", "name")); + + Assert.True(GetFilter(AutoCompleteFilterMode.StartsWithOrdinal)("na", "name")); + Assert.True(GetFilter(AutoCompleteFilterMode.StartsWithOrdinal)("NAM", "name")); + Assert.False(GetFilter(AutoCompleteFilterMode.StartsWithOrdinal)("hello", "name")); + + Assert.True(GetFilter(AutoCompleteFilterMode.StartsWithOrdinalCaseSensitive)("na", "name")); + Assert.False(GetFilter(AutoCompleteFilterMode.StartsWithOrdinalCaseSensitive)("NAM", "name")); + Assert.False(GetFilter(AutoCompleteFilterMode.StartsWithOrdinalCaseSensitive)("hello", "name")); + } + + [Fact] + public void Fires_DropDown_Events() + { + RunTest((control, textbox) => + { + bool openEvent = false; + bool closeEvent = false; + control.DropDownOpened += (s, e) => openEvent = true; + control.DropDownClosed += (s, e) => closeEvent = true; + control.Items = CreateSimpleStringArray(); + + textbox.Text = "a"; + Dispatcher.UIThread.RunJobs(); + Assert.True(control.SearchText == "a"); + Assert.True(control.IsDropDownOpen); + Assert.True(openEvent); + + textbox.Text = String.Empty; + Dispatcher.UIThread.RunJobs(); + Assert.True(control.SearchText == String.Empty); + Assert.False(control.IsDropDownOpen); + Assert.True(closeEvent); + }); + } + + [Fact] + public void Text_Completion_Via_Text_Property() + { + RunTest((control, textbox) => + { + control.IsTextCompletionEnabled = true; + + Assert.Equal(String.Empty, control.Text); + control.Text = "close"; + Assert.NotNull(control.SelectedItem); + }); + } + + [Fact] + public void Text_Completion_Selects_Text() + { + RunTest((control, textbox) => + { + control.IsTextCompletionEnabled = true; + + textbox.Text = "ac"; + textbox.SelectionEnd = textbox.SelectionStart = 2; + Dispatcher.UIThread.RunJobs(); + + Assert.True(control.IsDropDownOpen); + Assert.True(Math.Abs(textbox.SelectionEnd - textbox.SelectionStart) > 2); + }); + } + + [Fact] + public void TextChanged_Event_Fires() + { + RunTest((control, textbox) => + { + bool textChanged = false; + control.TextChanged += (s, e) => textChanged = true; + + textbox.Text = "a"; + Dispatcher.UIThread.RunJobs(); + Assert.True(textChanged); + + textChanged = false; + control.Text = "conversati"; + Dispatcher.UIThread.RunJobs(); + Assert.True(textChanged); + + textChanged = false; + control.Text = null; + Dispatcher.UIThread.RunJobs(); + Assert.True(textChanged); + }); + } + + [Fact] + public void MinimumPrefixLength_Works() + { + RunTest((control, textbox) => + { + textbox.Text = "a"; + Dispatcher.UIThread.RunJobs(); + Assert.True(control.IsDropDownOpen); + + + textbox.Text = String.Empty; + Dispatcher.UIThread.RunJobs(); + Assert.False(control.IsDropDownOpen); + + control.MinimumPrefixLength = 3; + + textbox.Text = "a"; + Dispatcher.UIThread.RunJobs(); + Assert.False(control.IsDropDownOpen); + + textbox.Text = "acc"; + Dispatcher.UIThread.RunJobs(); + Assert.True(control.IsDropDownOpen); + }); + } + + [Fact] + public void Can_Cancel_DropDown_Opening() + { + RunTest((control, textbox) => + { + control.DropDownOpening += (s, e) => e.Cancel = true; + + textbox.Text = "a"; + Dispatcher.UIThread.RunJobs(); + Assert.False(control.IsDropDownOpen); + }); + } + + [Fact] + public void Can_Cancel_DropDown_Closing() + { + RunTest((control, textbox) => + { + control.DropDownClosing += (s, e) => e.Cancel = true; + + textbox.Text = "a"; + Dispatcher.UIThread.RunJobs(); + Assert.True(control.IsDropDownOpen); + + control.IsDropDownOpen = false; + Assert.True(control.IsDropDownOpen); + }); + } + + [Fact] + public void Can_Cancel_Population() + { + RunTest((control, textbox) => + { + bool populating = false; + bool populated = false; + control.FilterMode = AutoCompleteFilterMode.None; + control.Populating += (s, e) => + { + e.Cancel = true; + populating = true; + }; + control.Populated += (s, e) => populated = true; + + textbox.Text = "accounti"; + Dispatcher.UIThread.RunJobs(); + + Assert.True(populating); + Assert.False(populated); + }); + } + + [Fact] + public void Custom_Population_Supported() + { + RunTest((control, textbox) => + { + string custom = "Custom!"; + string search = "accounti"; + bool populated = false; + bool populatedOk = false; + control.FilterMode = AutoCompleteFilterMode.None; + control.Populating += (s, e) => + { + control.Items = new string[] { custom }; + Assert.Equal(search, e.Parameter); + }; + control.Populated += (s, e) => + { + populated = true; + ReadOnlyCollection collection = e.Data as ReadOnlyCollection; + populatedOk = collection != null && collection.Count == 1; + }; + + textbox.Text = search; + Dispatcher.UIThread.RunJobs(); + + Assert.True(populated); + Assert.True(populatedOk); + }); + } + + [Fact] + public void Text_Completion() + { + RunTest((control, textbox) => + { + control.IsTextCompletionEnabled = true; + textbox.Text = "accounti"; + textbox.SelectionStart = textbox.SelectionEnd = textbox.Text.Length; + Dispatcher.UIThread.RunJobs(); + Assert.Equal("accounti", control.SearchText); + Assert.Equal("accounting", textbox.Text); + }); + } + + [Fact] + public void String_Search() + { + RunTest((control, textbox) => + { + textbox.Text = "a"; + Dispatcher.UIThread.RunJobs(); + Assert.Equal(textbox.Text, control.Text); + + textbox.Text = "acc"; + Dispatcher.UIThread.RunJobs(); + Assert.Equal(textbox.Text, control.Text); + + textbox.Text = "a"; + Dispatcher.UIThread.RunJobs(); + Assert.Equal(textbox.Text, control.Text); + + textbox.Text = ""; + Dispatcher.UIThread.RunJobs(); + Assert.Equal(textbox.Text, control.Text); + + textbox.Text = "cook"; + Dispatcher.UIThread.RunJobs(); + Assert.Equal(textbox.Text, control.Text); + + textbox.Text = "accept"; + Dispatcher.UIThread.RunJobs(); + Assert.Equal(textbox.Text, control.Text); + + textbox.Text = "cook"; + Dispatcher.UIThread.RunJobs(); + Assert.Equal(textbox.Text, control.Text); + }); + } + + [Fact] + public void Item_Search() + { + RunTest((control, textbox) => + { + control.FilterMode = AutoCompleteFilterMode.Custom; + control.ItemFilter = (search, item) => + { + string s = item as string; + return s == null ? false : true; + }; + + // Just set to null briefly to exercise that code path + AutoCompleteFilterPredicate filter = control.ItemFilter; + Assert.NotNull(filter); + control.ItemFilter = null; + Assert.Null(control.ItemFilter); + control.ItemFilter = filter; + Assert.NotNull(control.ItemFilter); + + textbox.Text = "a"; + Dispatcher.UIThread.RunJobs(); + Assert.Equal(textbox.Text, control.Text); + + textbox.Text = "acc"; + Dispatcher.UIThread.RunJobs(); + Assert.Equal(textbox.Text, control.Text); + + textbox.Text = "a"; + Dispatcher.UIThread.RunJobs(); + Assert.Equal(textbox.Text, control.Text); + + textbox.Text = ""; + Dispatcher.UIThread.RunJobs(); + Assert.Equal(textbox.Text, control.Text); + + textbox.Text = "cook"; + Dispatcher.UIThread.RunJobs(); + Assert.Equal(textbox.Text, control.Text); + + textbox.Text = "accept"; + Dispatcher.UIThread.RunJobs(); + Assert.Equal(textbox.Text, control.Text); + + textbox.Text = "cook"; + Dispatcher.UIThread.RunJobs(); + Assert.Equal(textbox.Text, control.Text); + }); + } + + /// + /// Retrieves a defined predicate filter through a new AutoCompleteBox + /// control instance. + /// + /// The FilterMode of interest. + /// Returns the predicate instance. + private static AutoCompleteFilterPredicate GetFilter(AutoCompleteFilterMode mode) + { + return new AutoCompleteBox { FilterMode = mode } + .TextFilter; + } + + /// + /// Creates a large list of strings for AutoCompleteBox testing. + /// + /// Returns a new List of string values. + private IList CreateSimpleStringArray() + { + return new List + { + "a", + "abide", + "able", + "about", + "above", + "absence", + "absurd", + "accept", + "acceptance", + "accepted", + "accepting", + "access", + "accessed", + "accessible", + "accident", + "accidentally", + "accordance", + "account", + "accounting", + "accounts", + "accusation", + "accustomed", + "ache", + "across", + "act", + "active", + "actual", + "actually", + "ada", + "added", + "adding", + "addition", + "additional", + "additions", + "address", + "addressed", + "addresses", + "addressing", + "adjourn", + "adoption", + "advance", + "advantage", + "adventures", + "advice", + "advisable", + "advise", + "affair", + "affectionately", + "afford", + "afore", + "afraid", + "after", + "afterwards", + "again", + "against", + "age", + "aged", + "agent", + "ago", + "agony", + "agree", + "agreed", + "agreement", + "ah", + "ahem", + "air", + "airs", + "ak", + "alarm", + "alarmed", + "alas", + "alice", + "alive", + "all", + "allow", + "almost", + "alone", + "along", + "aloud", + "already", + "also", + "alteration", + "altered", + "alternate", + "alternately", + "altogether", + "always", + "am", + "ambition", + "among", + "an", + "ancient", + "and", + "anger", + "angrily", + "angry", + "animal", + "animals", + "ann", + "annoy", + "annoyed", + "another", + "answer", + "answered", + "answers", + "antipathies", + "anxious", + "anxiously", + "any", + "anyone", + "anything", + "anywhere", + "appealed", + "appear", + "appearance", + "appeared", + "appearing", + "appears", + "applause", + "apple", + "apples", + "applicable", + "apply", + "approach", + "arch", + "archbishop", + "arches", + "archive", + "are", + "argue", + "argued", + "argument", + "arguments", + "arise", + "arithmetic", + "arm", + "arms", + "around", + "arranged", + "array", + "arrived", + "arrow", + "arrum", + "as", + "ascii", + "ashamed", + "ask", + "askance", + "asked", + "asking", + "asleep", + "assembled", + "assistance", + "associated", + "at", + "ate", + "atheling", + "atom", + "attached", + "attempt", + "attempted", + "attempts", + "attended", + "attending", + "attends", + "audibly", + "australia", + "author", + "authority", + "available", + "avoid", + "away", + "awfully", + "axes", + "axis", + "b", + "baby", + "back", + "backs", + "bad", + "bag", + "baked", + "balanced", + "bank", + "banks", + "banquet", + "bark", + "barking", + "barley", + "barrowful", + "based", + "bat", + "bathing", + "bats", + "bawled", + "be", + "beak", + "bear", + "beast", + "beasts", + "beat", + "beating", + "beau", + "beauti", + "beautiful", + "beautifully", + "beautify", + "became", + "because", + "become", + "becoming", + "bed", + "beds", + "bee", + "been", + "before", + "beg", + "began", + "begged", + "begin", + "beginning", + "begins", + "begun", + "behead", + "beheaded", + "beheading", + "behind", + "being", + "believe", + "believed", + "bells", + "belong", + "belongs", + "beloved", + "below", + "belt", + "bend", + "bent", + "besides", + "best", + "better", + "between", + "bill", + "binary", + "bird", + "birds", + "birthday", + "bit", + "bite", + "bitter", + "blacking", + "blades", + "blame", + "blasts", + "bleeds", + "blew", + "blow", + "blown", + "blows", + "body", + "boldly", + "bone", + "bones", + "book", + "books", + "boon", + "boots", + "bore", + "both", + "bother", + "bottle", + "bottom", + "bough", + "bound", + "bowed", + "bowing", + "box", + "boxed", + "boy", + "brain", + "branch", + "branches", + "brandy", + "brass", + "brave", + "breach", + "bread", + "break", + "breath", + "breathe", + "breeze", + "bright", + "brightened", + "bring", + "bringing", + "bristling", + "broke", + "broken", + "brother", + "brought", + "brown", + "brush", + "brushing", + "burn", + "burning", + "burnt", + "burst", + "bursting", + "busily", + "business", + "business@pglaf", + "busy", + "but", + "butter", + "buttercup", + "buttered", + "butterfly", + "buttons", + "by", + "bye", + "c", + "cackled", + "cake", + "cakes", + "calculate", + "calculated", + "call", + "called", + "calling", + "calmly", + "came", + "camomile", + "can", + "canary", + "candle", + "cannot", + "canterbury", + "canvas", + "capering", + "capital", + "card", + "cardboard", + "cards", + "care", + "carefully", + "cares", + "carried", + "carrier", + "carroll", + "carry", + "carrying", + "cart", + "cartwheels", + "case", + "cat", + "catch", + "catching", + "caterpillar", + "cats", + "cattle", + "caucus", + "caught", + "cauldron", + "cause", + "caused", + "cautiously", + "cease", + "ceiling", + "centre", + "certain", + "certainly", + "chain", + "chains", + "chair", + "chance", + "chanced", + "change", + "changed", + "changes", + "changing", + "chapter", + "character", + "charge", + "charges", + "charitable", + "charities", + "chatte", + "cheap", + "cheated", + "check", + "checked", + "checks", + "cheeks", + "cheered", + "cheerfully", + "cherry", + "cheshire", + "chief", + "child", + "childhood", + "children", + "chimney", + "chimneys", + "chin", + "choice", + "choke", + "choked", + "choking", + "choose", + "choosing", + "chop", + "chorus", + "chose", + "christmas", + "chrysalis", + "chuckled", + "circle", + "circumstances", + "city", + "civil", + "claim", + "clamour", + "clapping", + "clasped", + "classics", + "claws", + "clean", + "clear", + "cleared", + "clearer", + "clearly", + "clever", + "climb", + "clinging", + "clock", + "close", + "closed", + "closely", + "closer", + "clubs", + "coast", + "coaxing", + "codes", + "coils", + "cold", + "collar", + "collected", + "collection", + "come", + "comes", + "comfits", + "comfort", + "comfortable", + "comfortably", + "coming", + "commercial", + "committed", + "common", + "commotion", + "company", + "compilation", + "complained", + "complaining", + "completely", + "compliance", + "comply", + "complying", + "compressed", + "computer", + "computers", + "concept", + "concerning", + "concert", + "concluded", + "conclusion", + "condemn", + "conduct", + "confirmation", + "confirmed", + "confused", + "confusing", + "confusion", + "conger", + "conqueror", + "conquest", + "consented", + "consequential", + "consider", + "considerable", + "considered", + "considering", + "constant", + "consultation", + "contact", + "contain", + "containing", + "contempt", + "contemptuous", + "contemptuously", + "content", + "continued", + "contract", + "contradicted", + "contributions", + "conversation", + "conversations", + "convert", + "cook", + "cool", + "copied", + "copies", + "copy", + "copying", + "copyright", + "corner", + "corners", + "corporation", + "corrupt", + "cost", + "costs", + "could", + "couldn", + "counting", + "countries", + "country", + "couple", + "couples", + "courage", + "course", + "court", + "courtiers", + "coward", + "crab", + "crash", + "crashed", + "crawled", + "crawling", + "crazy", + "created", + "creating", + "creation", + "creature", + "creatures", + "credit", + "creep", + "crept", + "cried", + "cries", + "crimson", + "critical", + "crocodile", + "croquet", + "croqueted", + "croqueting", + "cross", + "crossed", + "crossly", + "crouched", + "crowd", + "crowded", + "crown", + "crumbs", + "crust", + "cry", + "crying", + "cucumber", + "cunning", + "cup", + "cupboards", + "cur", + "curiosity", + "curious", + "curiouser", + "curled", + "curls", + "curly", + "currants", + "current", + "curtain", + "curtsey", + "curtseying", + "curving", + "cushion", + "custard", + "custody", + "cut", + "cutting", + }; + } + private void RunTest(Action test) + { + using (UnitTestApplication.Start(Services)) + { + AutoCompleteBox control = CreateControl(); + control.Items = CreateSimpleStringArray(); + TextBox textBox = GetTextBox(control); + Dispatcher.UIThread.RunJobs(); + test.Invoke(control, textBox); + } + } + + private static TestServices Services => TestServices.StyledWindow; + + /*private static TestServices Services => TestServices.MockThreadingInterface.With( + standardCursorFactory: Mock.Of(), + windowingPlatform: new MockWindowingPlatform());*/ + + private AutoCompleteBox CreateControl() + { + var datePicker = + new AutoCompleteBox + { + Template = CreateTemplate() + }; + + datePicker.ApplyTemplate(); + return datePicker; + } + private TextBox GetTextBox(AutoCompleteBox control) + { + return control.GetTemplateChildren() + .OfType() + .First(); + } + private IControlTemplate CreateTemplate() + { + return new FuncControlTemplate(control => + { + var textBox = + new TextBox + { + Name = "PART_TextBox" + }; + var listbox = + new ListBox + { + Name = "PART_SelectingItemsControl" + }; + var popup = + new Popup + { + Name = "PART_Popup" + }; + + var panel = new Panel(); + panel.Children.Add(textBox); + panel.Children.Add(popup); + panel.Children.Add(listbox); + + return panel; + }); + } + } +}