Steven Kirk
8 years ago
committed by
GitHub
GitHub
6 changed files with 223 additions and 76 deletions
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// Copyright (c) The Avalonia Project. All rights reserved.
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// Licensed under the MIT license. See licence.md file in the project root for full license information.
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using System; |
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using System.Collections.Generic; |
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using System.Linq; |
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using System.Reactive.Linq; |
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using Avalonia.Controls.Primitives; |
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using Avalonia.Controls.Templates; |
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using Avalonia.Data; |
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namespace Avalonia.Controls |
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{ |
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/// <summary>
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/// A control which displays an error notifier when there is a DataValidationError.
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/// Provides attached properties to track errors on a control
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/// </summary>
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/// <remarks>
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/// You will probably only want to create instances inside of control templates.
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/// </remarks>
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public class DataValidationErrors : ContentControl |
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{ |
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/// <summary>
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/// Defines the DataValidationErrors.Errors attached property.
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/// </summary>
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public static readonly AttachedProperty<IEnumerable<Exception>> ErrorsProperty = |
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AvaloniaProperty.RegisterAttached<DataValidationErrors, Control, IEnumerable<Exception>>("Errors"); |
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/// <summary>
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/// Defines the DataValidationErrors.HasErrors attached property.
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/// </summary>
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public static readonly AttachedProperty<bool> HasErrorsProperty = |
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AvaloniaProperty.RegisterAttached<DataValidationErrors, Control, bool>("HasErrors"); |
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public static readonly StyledProperty<IDataTemplate> ErrorTemplateProperty = |
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AvaloniaProperty.Register<DataValidationErrors, IDataTemplate>(nameof(ErrorTemplate)); |
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private Control _owner; |
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public static readonly DirectProperty<DataValidationErrors, Control> OwnerProperty = |
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AvaloniaProperty.RegisterDirect<DataValidationErrors, Control>( |
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nameof(Owner), |
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o => o.Owner, |
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(o, v) => o.Owner = v); |
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public Control Owner |
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{ |
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get { return _owner; } |
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set { SetAndRaise(OwnerProperty, ref _owner, value); } |
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} |
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/// <summary>
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/// Initializes static members of the <see cref="DataValidationErrors"/> class.
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/// </summary>
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static DataValidationErrors() |
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{ |
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ErrorsProperty.Changed.Subscribe(ErrorsChanged); |
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HasErrorsProperty.Changed.Subscribe(HasErrorsChanged); |
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TemplatedParentProperty.Changed.AddClassHandler<DataValidationErrors>(x => x.OnTemplatedParentChange); |
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} |
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private void OnTemplatedParentChange(AvaloniaPropertyChangedEventArgs e) |
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{ |
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if (Owner == null) |
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{ |
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Owner = (e.NewValue as Control); |
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} |
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} |
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public IDataTemplate ErrorTemplate |
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{ |
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get { return GetValue(ErrorTemplateProperty); } |
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set { SetValue(ErrorTemplateProperty, value); } |
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} |
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private static void ErrorsChanged(AvaloniaPropertyChangedEventArgs e) |
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{ |
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var control = (Control)e.Sender; |
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var errors = (IEnumerable<Exception>)e.NewValue; |
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var hasErrors = false; |
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if (errors != null && errors.Any()) |
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hasErrors = true; |
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control.SetValue(HasErrorsProperty, hasErrors); |
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} |
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private static void HasErrorsChanged(AvaloniaPropertyChangedEventArgs e) |
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{ |
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var control = (Control)e.Sender; |
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var classes = (IPseudoClasses)control.Classes; |
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classes.Set(":error", (bool)e.NewValue); |
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} |
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public static IEnumerable<Exception> GetErrors(Control control) |
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{ |
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return control.GetValue(ErrorsProperty); |
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} |
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public static void SetErrors(Control control, IEnumerable<Exception> errors) |
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{ |
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control.SetValue(ErrorsProperty, errors); |
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} |
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public static void SetError(Control control, Exception error) |
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{ |
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SetErrors(control, UnpackException(error)); |
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} |
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public static void ClearErrors(Control control) |
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{ |
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SetErrors(control, null); |
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} |
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public static bool GetHasErrors(Control control) |
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{ |
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return control.GetValue(HasErrorsProperty); |
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} |
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private static IEnumerable<Exception> UnpackException(Exception exception) |
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{ |
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if (exception != null) |
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{ |
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var aggregate = exception as AggregateException; |
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var exceptions = aggregate == null ? |
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(IEnumerable<Exception>)new[] { exception } : |
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aggregate.InnerExceptions; |
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var filtered = exceptions.Where(x => !(x is BindingChainException)).ToList(); |
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if (filtered.Count > 0) |
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{ |
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return filtered; |
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} |
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} |
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return null; |
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} |
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} |
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} |
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@ -0,0 +1,38 @@ |
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<Style xmlns="https://github.com/avaloniaui" |
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Selector="DataValidationErrors"> |
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<Setter Property="Template"> |
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<ControlTemplate> |
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<DockPanel LastChildFill="True"> |
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<ContentControl DockPanel.Dock="Right" |
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ContentTemplate="{TemplateBinding ErrorTemplate}" |
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DataContext="{TemplateBinding Owner}" |
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Content="{Binding (DataValidationErrors.Errors)}" |
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IsVisible="{Binding (DataValidationErrors.HasErrors)}"/> |
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<ContentPresenter Name="PART_ContentPresenter" |
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Background="{TemplateBinding Background}" |
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BorderBrush="{TemplateBinding BorderBrush}" |
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BorderThickness="{TemplateBinding BorderThickness}" |
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ContentTemplate="{TemplateBinding ContentTemplate}" |
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Content="{TemplateBinding Content}" |
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Padding="{TemplateBinding Padding}"/> |
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</DockPanel> |
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</ControlTemplate> |
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</Setter> |
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<Setter Property="ErrorTemplate"> |
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<DataTemplate> |
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<Canvas Width="14" Height="14" Margin="4 0 1 0" |
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Background="#00FFFFFF"> |
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<Canvas.Styles> |
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<Style Selector="ToolTip"> |
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<Setter Property="Background" Value="{DynamicResource ErrorBrushLight}"/> |
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<Setter Property="BorderBrush" Value="{DynamicResource ErrorBrush}"/> |
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</Style> |
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</Canvas.Styles> |
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<ToolTip.Tip> |
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<ItemsControl Items="{Binding}" MemberSelector="Message"/> |
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</ToolTip.Tip> |
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<Path Data="M14,7 A7,7 0 0,0 0,7 M0,7 A7,7 0 1,0 14,7 M7,3l0,5 M7,9l0,2" Stroke="{DynamicResource ErrorBrush}" StrokeThickness="2"/> |
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</Canvas> |
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</DataTemplate> |
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</Setter> |
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</Style> |
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