Merge branch 'master' into fix-4733-property-accessor

nukebuild/Build.cs

@@ -138,9 +138,19 @@ partial class Build : NukeBuild
                 .SetWorkingDirectory(webappDir)
                 .SetCommand("dist"));
         });
-    
-    Target Compile => _ => _
+
+    Target CompileNative => _ => _
         .DependsOn(Clean)
+        .OnlyWhenStatic(() => EnvironmentInfo.IsOsx)
+        .Executes(() =>
+        {
+            var project = $"{RootDirectory}/native/Avalonia.Native/src/OSX/Avalonia.Native.OSX.xcodeproj/";
+            var args = $"-project {project} -configuration {Parameters.Configuration} CONFIGURATION_BUILD_DIR={RootDirectory}/Build/Products/Release";
+            ProcessTasks.StartProcess("xcodebuild", args).AssertZeroExitCode();
+        });
+
+    Target Compile => _ => _
+        .DependsOn(Clean, CompileNative)
         .DependsOn(CompileHtmlPreviewer)
         .Executes(async () =>
         {

samples/ControlCatalog/Pages/DataGridPage.xaml

@@ -11,12 +11,17 @@
       <Setter Property="Background" Value="{Binding Path=GDP, Mode=OneWay, Converter={StaticResource GDPConverter}}" />
     </Style>
   </UserControl.Styles>
-  <Grid RowDefinitions="Auto,*">
+  <Grid RowDefinitions="Auto,Auto,*">
     <StackPanel Orientation="Vertical" Spacing="4" Grid.Row="0">
       <TextBlock Classes="h1">DataGrid</TextBlock>
       <TextBlock Classes="h2">A control for displaying and interacting with a data source.</TextBlock>
     </StackPanel>
-    <TabControl Grid.Row="1">
+    <StackPanel Grid.Row="1" Spacing="4" Orientation="Horizontal" IsVisible="{Binding #EditableTab.IsSelected}">
+      <TextBlock Text="FontSize:" VerticalAlignment="Center"/>
+      <Slider x:Name="FontSizeSlider" Minimum="5" Maximum="30" Value="14" Width="100" VerticalAlignment="Center" />
+      <CheckBox x:Name="IsThreeStateCheckBox" IsChecked="False" Content="IsThreeState"/>
+    </StackPanel>
+    <TabControl Grid.Row="2">
       <TabItem Header="DataGrid">
         <DataGrid Name="dataGrid1" Margin="12" CanUserResizeColumns="True" CanUserReorderColumns="True" CanUserSortColumns="True" HeadersVisibility="All">
           <DataGrid.Columns>
@@ -39,13 +44,13 @@
           </DataGrid.Columns>
         </DataGrid>
       </TabItem>
-      <TabItem Header="Editable">
+      <TabItem x:Name="EditableTab" Header="Editable">
         <Grid RowDefinitions="*,Auto">
           <DataGrid Name="dataGridEdit" Margin="12" Grid.Row="0">
             <DataGrid.Columns>
-              <DataGridTextColumn Header="First Name" Binding="{Binding FirstName}" Width="2*" />
-              <DataGridTextColumn Header="Last" Binding="{Binding LastName}" Width="2*" />
-              <DataGridCheckBoxColumn Header="Is Banned" Binding="{Binding IsBanned}" Width="*" />
+              <DataGridTextColumn Header="First Name" Binding="{Binding FirstName}" Width="2*" FontSize="{Binding #FontSizeSlider.Value, Mode=OneWay}" />
+              <DataGridTextColumn Header="Last" Binding="{Binding LastName}" Width="2*" FontSize="{Binding #FontSizeSlider.Value, Mode=OneWay}" />
+              <DataGridCheckBoxColumn Header="Is Banned" Binding="{Binding IsBanned}" Width="*" IsThreeState="{Binding #IsThreeStateCheckBox.IsChecked, Mode=OneWay}" />
             </DataGrid.Columns>
           </DataGrid>
           <Button Grid.Row="1" Name="btnAdd" Margin="12,0,12,12" Content="Add" HorizontalAlignment="Right" />

samples/RenderDemo/Pages/GlyphRunPage.xaml.cs

@@ -61,7 +61,6 @@ namespace RenderDemo.Pages
             {
                 Foreground = Brushes.Black,
                 GlyphRun = new GlyphRun(_glyphTypeface, _fontSize, _glyphIndices),
-                BaselineOrigin = new Point(0, -_glyphTypeface.Ascent * scale)
             };
 
             drawingGroup.Children.Add(glyphRunDrawing);
@@ -69,7 +68,7 @@ namespace RenderDemo.Pages
             var geometryDrawing = new GeometryDrawing
             {
                 Pen = new Pen(Brushes.Black),
-                Geometry = new RectangleGeometry { Rect = glyphRunDrawing.GlyphRun.Bounds }
+                Geometry = new RectangleGeometry { Rect = new Rect(glyphRunDrawing.GlyphRun.Size) }
             };
 
             drawingGroup.Children.Add(geometryDrawing);

src/Avalonia.Animation/KeySplineTypeConverter.cs

@@ -19,7 +19,7 @@ namespace Avalonia.Animation
 
         public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
         {
-            return KeySpline.Parse((string)value, culture);
+            return KeySpline.Parse((string)value, CultureInfo.InvariantCulture);
         }
     }
 }

src/Avalonia.Base/Data/Core/Plugins/DataAnnotationsValidationPlugin.cs

@@ -63,12 +63,12 @@ namespace Avalonia.Data.Core.Plugins
             {
                 if (errors.Count == 1)
                 {
-                    return new ValidationException(errors[0].ErrorMessage);
+                    return new DataValidationException(errors[0].ErrorMessage);
                 }
                 else
                 {
                     return new AggregateException(
-                        errors.Select(x => new ValidationException(x.ErrorMessage)));
+                        errors.Select(x => new DataValidationException(x.ErrorMessage)));
                 }
             }
         }

src/Avalonia.Controls.DataGrid/ApiCompatBaseline.txt

@@ -0,0 +1,5 @@
+Compat issues with assembly Avalonia.Controls.DataGrid:
+MembersMustExist : Member 'public Avalonia.StyledProperty<System.String> Avalonia.StyledProperty<System.String> Avalonia.Controls.DataGridTextColumn.FontFamilyProperty' does not exist in the implementation but it does exist in the contract.
+MembersMustExist : Member 'public System.String Avalonia.Controls.DataGridTextColumn.FontFamily.get()' does not exist in the implementation but it does exist in the contract.
+MembersMustExist : Member 'public void Avalonia.Controls.DataGridTextColumn.FontFamily.set(System.String)' does not exist in the implementation but it does exist in the contract.
+Total Issues: 3

src/Avalonia.Controls.DataGrid/DataGrid.cs

@@ -31,7 +31,7 @@ namespace Avalonia.Controls
     /// <summary>
     /// Displays data in a customizable grid.
     /// </summary>
-    [PseudoClasses(":invalid")]
+    [PseudoClasses(":invalid", ":empty-rows", ":empty-columns")]
     public partial class DataGrid : TemplatedControl
     {
         private const string DATAGRID_elementRowsPresenterName = "PART_RowsPresenter";
@@ -711,6 +711,7 @@ namespace Avalonia.Controls
 
             DisplayData = new DataGridDisplayData(this);
             ColumnsInternal = CreateColumnsInstance();
+            ColumnsInternal.CollectionChanged += ColumnsInternal_CollectionChanged;
 
             RowHeightEstimate = DATAGRID_defaultRowHeight;
             RowDetailsHeightEstimate = 0;
@@ -727,6 +728,8 @@ namespace Avalonia.Controls
             CurrentCellCoordinates = new DataGridCellCoordinates(-1, -1);
 
             RowGroupHeaderHeightEstimate = DATAGRID_defaultRowHeight;
+
+            UpdatePseudoClasses();
         }
 
         private void SetValueNoCallback<T>(AvaloniaProperty<T> property, T value, BindingPriority priority = BindingPriority.LocalValue)
@@ -851,9 +854,27 @@ namespace Avalonia.Controls
                 // can be set when the DataGrid is not part of the visual tree
                 _measured = false;
                 InvalidateMeasure();
+
+                UpdatePseudoClasses();
             }
         }
 
+        private void ColumnsInternal_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
+        {
+            if (e.Action == NotifyCollectionChangedAction.Add
+                || e.Action == NotifyCollectionChangedAction.Remove
+                || e.Action == NotifyCollectionChangedAction.Reset)
+            {
+                UpdatePseudoClasses();
+            }
+        }
+
+        internal void UpdatePseudoClasses()
+        {
+            PseudoClasses.Set(":empty-columns", !ColumnsInternal.GetVisibleColumns().Any());
+            PseudoClasses.Set(":empty-rows", !DataConnection.Any());
+        }
+
         private void OnSelectedIndexChanged(AvaloniaPropertyChangedEventArgs e)
         {
             if (!_areHandlersSuspended)
@@ -1348,7 +1369,6 @@ namespace Avalonia.Controls
         internal DataGridColumnCollection ColumnsInternal
         {
             get;
-            private set;
         }
 
         internal int AnchorSlot

src/Avalonia.Controls.DataGrid/DataGridCheckBoxColumn.cs

@@ -17,9 +17,7 @@ namespace Avalonia.Controls
     /// </summary>
     public class DataGridCheckBoxColumn : DataGridBoundColumn
     {
-
         private bool _beganEditWithKeyboard;
-        private bool _isThreeState;
         private CheckBox _currentCheckBox;
         private DataGrid _owningGrid;
 
@@ -31,6 +29,12 @@ namespace Avalonia.Controls
             BindingTarget = CheckBox.IsCheckedProperty;
         }
 
+        /// <summary>
+        /// Defines the <see cref="IsThreeState"/> property.
+        /// </summary>
+        public static StyledProperty<bool> IsThreeStateProperty =
+            CheckBox.IsThreeStateProperty.AddOwner<DataGridCheckBoxColumn>();
+
         /// <summary>
         /// Gets or sets a value that indicates whether the hosted <see cref="T:System.Windows.Controls.CheckBox" /> controls allow three states or two. 
         /// </summary>
@@ -39,17 +43,17 @@ namespace Avalonia.Controls
         /// </returns>
         public bool IsThreeState
         {
-            get
-            {
-                return _isThreeState;
-            }
-            set
+            get => GetValue(IsThreeStateProperty);
+            set => SetValue(IsThreeStateProperty, value);
+        }
+
+        protected override void OnPropertyChanged<T>(AvaloniaPropertyChangedEventArgs<T> change)
+        {
+            base.OnPropertyChanged(change);
+
+            if (change.Property == IsThreeStateProperty)
             {
-                if (_isThreeState != value)
-                {
-                    _isThreeState = value;
-                    NotifyPropertyChanged(nameof(IsThreeState));
-                }
+                NotifyPropertyChanged(change.Property.Name);
             }
         }
 
@@ -203,9 +207,9 @@ namespace Avalonia.Controls
             {
                 throw new ArgumentNullException("element");
             }
-            if(element is CheckBox checkBox)
+            if (element is CheckBox checkBox)
             {
-                checkBox.IsThreeState = IsThreeState;
+                DataGridHelper.SyncColumnProperty(this, checkBox, IsThreeStateProperty);
             }
             else
             {
@@ -229,7 +233,7 @@ namespace Avalonia.Controls
         {
             checkBox.HorizontalAlignment = HorizontalAlignment.Center;
             checkBox.VerticalAlignment = VerticalAlignment.Center;
-            checkBox.IsThreeState = IsThreeState;
+            DataGridHelper.SyncColumnProperty(this, checkBox, IsThreeStateProperty);
         }
 
         private bool EnsureOwningGrid()

src/Avalonia.Controls.DataGrid/DataGridDataConnection.cs

@@ -77,24 +77,7 @@ namespace Avalonia.Controls
             private set;
         }
 
-        public int Count
-        {
-            get
-            {
-                IList list = List;
-                if (list != null)
-                {
-                    return list.Count;
-                }
-
-                if(DataSource is DataGridCollectionView cv)
-                {
-                    return cv.Count;
-                }
-
-                return DataSource?.Cast<object>().Count() ?? 0;
-            }
-        }
+        public int Count => GetCount(true);
 
         public bool DataIsPrimitive
         {
@@ -210,6 +193,24 @@ namespace Avalonia.Controls
             }
         }
 
+        internal bool Any()
+        {
+            return GetCount(false) > 0;
+        }
+
+        /// <param name="allowSlow">When "allowSlow" is false, method will not use Linq.Count() method and will return 0 or 1 instead.</param>
+        private int GetCount(bool allowSlow)
+        {
+            return DataSource switch
+            {
+                ICollection collection => collection.Count,
+                DataGridCollectionView cv => cv.Count,
+                IEnumerable enumerable when allowSlow => enumerable.Cast<object>().Count(),
+                IEnumerable enumerable when !allowSlow => enumerable.Cast<object>().Any() ? 1 : 0,
+                _ => 0
+            };
+        }
+
         /// <summary>
         /// Puts the entity into editing mode if possible
         /// </summary>
@@ -675,6 +676,8 @@ namespace Avalonia.Controls
                     }
                     break;
             }
+
+            _owner.UpdatePseudoClasses();
         }
 
         private void UpdateDataProperties()

src/Avalonia.Controls.DataGrid/DataGridTextColumn.cs

@@ -20,11 +20,6 @@ namespace Avalonia.Controls
     {
         private const string DATAGRID_TextColumnCellTextBlockMarginKey = "DataGridTextColumnCellTextBlockMargin";
 
-        private double? _fontSize;
-        private FontStyle? _fontStyle;
-        private FontWeight? _fontWeight;
-        private IBrush _foreground;
-
         /// <summary>
         /// Initializes a new instance of the <see cref="T:Avalonia.Controls.DataGridTextColumn" /> class.
         /// </summary>
@@ -36,18 +31,24 @@ namespace Avalonia.Controls
         /// <summary>
         /// Identifies the FontFamily dependency property.
         /// </summary>
-        public static readonly StyledProperty<string> FontFamilyProperty =
-            AvaloniaProperty.Register<DataGridTextColumn, string>(nameof(FontFamily));
+        public static readonly AttachedProperty<FontFamily> FontFamilyProperty =
+            TextBlock.FontFamilyProperty.AddOwner<DataGridTextColumn>();
 
         /// <summary>
         /// Gets or sets the font name.
         /// </summary>
-        public string FontFamily
+        public FontFamily FontFamily
         {
-            get { return GetValue(FontFamilyProperty); }
-            set { SetValue(FontFamilyProperty, value); }
+            get => GetValue(FontFamilyProperty);
+            set => SetValue(FontFamilyProperty, value);
         }
 
+        /// <summary>
+        /// Identifies the FontSize dependency property.
+        /// </summary>
+        public static readonly AttachedProperty<double> FontSizeProperty =
+            TextBlock.FontSizeProperty.AddOwner<DataGridTextColumn>();
+
         /// <summary>
         /// Gets or sets the font size.
         /// </summary>
@@ -55,74 +56,66 @@ namespace Avalonia.Controls
         [DefaultValue(double.NaN)]
         public double FontSize
         {
-            get
-            {
-                return _fontSize ?? Double.NaN;
-            }
-            set
-            {
-                if (_fontSize != value)
-                {
-                    _fontSize = value;
-                    NotifyPropertyChanged(nameof(FontSize));
-                }
-            }
+            get => GetValue(FontSizeProperty);
+            set => SetValue(FontSizeProperty, value);
         }
 
+        /// <summary>
+        /// Identifies the FontStyle dependency property.
+        /// </summary>
+        public static readonly AttachedProperty<FontStyle> FontStyleProperty =
+            TextBlock.FontStyleProperty.AddOwner<DataGridTextColumn>();
+
         /// <summary>
         /// Gets or sets the font style.
         /// </summary>
         public FontStyle FontStyle
         {
-            get
-            {
-                return _fontStyle ?? FontStyle.Normal;
-            }
-            set
-            {
-                if (_fontStyle != value)
-                {
-                    _fontStyle = value;
-                    NotifyPropertyChanged(nameof(FontStyle));
-                }
-            }
+            get => GetValue(FontStyleProperty);
+            set => SetValue(FontStyleProperty, value);
         }
 
+        /// <summary>
+        /// Identifies the FontWeight dependency property.
+        /// </summary>
+        public static readonly AttachedProperty<FontWeight> FontWeightProperty =
+            TextBlock.FontWeightProperty.AddOwner<DataGridTextColumn>();
+
         /// <summary>
         /// Gets or sets the font weight or thickness.
         /// </summary>
         public FontWeight FontWeight
         {
-            get
-            {
-                return _fontWeight ?? FontWeight.Normal;
-            }
-            set
-            {
-                if (_fontWeight != value)
-                {
-                    _fontWeight = value;
-                    NotifyPropertyChanged(nameof(FontWeight));
-                }
-            }
+            get => GetValue(FontWeightProperty);
+            set => SetValue(FontWeightProperty, value);
         }
 
+        /// <summary>
+        /// Identifies the Foreground dependency property.
+        /// </summary>
+        public static readonly AttachedProperty<IBrush> ForegroundProperty =
+            TextBlock.ForegroundProperty.AddOwner<DataGridTextColumn>();
+
         /// <summary>
         /// Gets or sets a brush that describes the foreground of the column cells.
         /// </summary>
         public IBrush Foreground
         {
-            get
-            {
-                return _foreground;
-            }
-            set
+            get => GetValue(ForegroundProperty);
+            set => SetValue(ForegroundProperty, value);
+        }
+
+        protected override void OnPropertyChanged<T>(AvaloniaPropertyChangedEventArgs<T> change)
+        {
+            base.OnPropertyChanged(change);
+
+            if (change.Property == FontFamilyProperty
+                || change.Property == FontSizeProperty
+                || change.Property == FontStyleProperty
+                || change.Property == FontWeightProperty
+                || change.Property == ForegroundProperty)
             {
-                if (_foreground != value)
-                {
-                    _foreground = value;
-                    NotifyPropertyChanged(nameof(Foreground));
-                }
+                NotifyPropertyChanged(change.Property.Name);
             }
         }
 
@@ -154,26 +147,7 @@ namespace Avalonia.Controls
                 Background = new SolidColorBrush(Colors.Transparent)
             };
 
-            if (IsSet(FontFamilyProperty))
-            {
-                textBox.FontFamily = FontFamily;
-            }
-            if (_fontSize.HasValue)
-            {
-                textBox.FontSize = _fontSize.Value;
-            }
-            if (_fontStyle.HasValue)
-            {
-                textBox.FontStyle = _fontStyle.Value;
-            }
-            if (_fontWeight.HasValue)
-            {
-                textBox.FontWeight = _fontWeight.Value;
-            }
-            if (_foreground != null)
-            {
-                textBox.Foreground = _foreground;
-            }
+            SyncProperties(textBox);
 
             return textBox;
         }
@@ -192,26 +166,8 @@ namespace Avalonia.Controls
                 VerticalAlignment = VerticalAlignment.Center
             };
 
-            if (IsSet(FontFamilyProperty))
-            {
-                textBlockElement.FontFamily = FontFamily;
-            }
-            if (_fontSize.HasValue)
-            {
-                textBlockElement.FontSize = _fontSize.Value;
-            }
-            if (_fontStyle.HasValue)
-            {
-                textBlockElement.FontStyle = _fontStyle.Value;
-            }
-            if (_fontWeight.HasValue)
-            {
-                textBlockElement.FontWeight = _fontWeight.Value;
-            }
-            if (_foreground != null)
-            {
-                textBlockElement.Foreground = _foreground;
-            }
+            SyncProperties(textBlockElement);
+
             if (Binding != null)
             {
                 textBlockElement.Bind(TextBlock.TextProperty, Binding);
@@ -261,99 +217,42 @@ namespace Avalonia.Controls
                 throw new ArgumentNullException("element");
             }
 
-            if(element is TextBox textBox)
+            if (element is AvaloniaObject content)
             {
                 if (propertyName == nameof(FontFamily))
                 {
-                    textBox.FontFamily = FontFamily;
+                    DataGridHelper.SyncColumnProperty(this, content, FontFamilyProperty);
                 }
                 else if (propertyName == nameof(FontSize))
                 {
-                    SetTextFontSize(textBox, TextBox.FontSizeProperty);
+                    DataGridHelper.SyncColumnProperty(this, content, FontSizeProperty);
                 }
                 else if (propertyName == nameof(FontStyle))
                 {
-                    textBox.FontStyle = FontStyle;
+                    DataGridHelper.SyncColumnProperty(this, content, FontStyleProperty);
                 }
                 else if (propertyName == nameof(FontWeight))
                 {
-                    textBox.FontWeight = FontWeight;
+                    DataGridHelper.SyncColumnProperty(this, content, FontWeightProperty);
                 }
                 else if (propertyName == nameof(Foreground))
                 {
-                    textBox.Foreground = Foreground;
-                }
-                else
-                {
-                    if (FontFamily != null)
-                    {
-                        textBox.FontFamily = FontFamily;
-                    }
-                    SetTextFontSize(textBox, TextBox.FontSizeProperty);
-                    textBox.FontStyle = FontStyle;
-                    textBox.FontWeight = FontWeight;
-                    if (Foreground != null)
-                    {
-                        textBox.Foreground = Foreground;
-                    }
-                }
-
-            }
-            else if (element is TextBlock textBlock)
-            {
-                if (propertyName == nameof(FontFamily))
-                {
-                    textBlock.FontFamily = FontFamily;
-                }
-                else if (propertyName == nameof(FontSize))
-                {
-                    SetTextFontSize(textBlock, TextBlock.FontSizeProperty);
-                }
-                else if (propertyName == nameof(FontStyle))
-                {
-                    textBlock.FontStyle = FontStyle;
-                }
-                else if (propertyName == nameof(FontWeight))
-                {
-                    textBlock.FontWeight = FontWeight;
-                }
-                else if (propertyName == nameof(Foreground))
-                {
-                    textBlock.Foreground = Foreground;
-                }
-                else
-                {
-                    if (FontFamily != null)
-                    {
-                        textBlock.FontFamily = FontFamily;
-                    }
-                    SetTextFontSize(textBlock, TextBlock.FontSizeProperty);
-                    textBlock.FontStyle = FontStyle;
-                    textBlock.FontWeight = FontWeight;
-                    if (Foreground != null)
-                    {
-                        textBlock.Foreground = Foreground;
-                    }
+                    DataGridHelper.SyncColumnProperty(this, content, ForegroundProperty);
                 }
             }
             else
             {
-                throw DataGridError.DataGrid.ValueIsNotAnInstanceOfEitherOr("element", typeof(TextBox), typeof(TextBlock));
+                throw DataGridError.DataGrid.ValueIsNotAnInstanceOf("element", typeof(AvaloniaObject));
             }
         }
 
-        private void SetTextFontSize(AvaloniaObject textElement, AvaloniaProperty fontSizeProperty)
+        private void SyncProperties(AvaloniaObject content)
         {
-            double newFontSize = FontSize;
-            if (double.IsNaN(newFontSize))
-            {
-                textElement.ClearValue(fontSizeProperty);
-            }
-            else
-            {
-                textElement.SetValue(fontSizeProperty, newFontSize);
-            }
+            DataGridHelper.SyncColumnProperty(this, content, FontFamilyProperty);
+            DataGridHelper.SyncColumnProperty(this, content, FontSizeProperty);
+            DataGridHelper.SyncColumnProperty(this, content, FontStyleProperty);
+            DataGridHelper.SyncColumnProperty(this, content, FontWeightProperty);
+            DataGridHelper.SyncColumnProperty(this, content, ForegroundProperty);
         }
-
     }
 }

src/Avalonia.Controls.DataGrid/Themes/Fluent.xaml

@@ -588,18 +588,11 @@
             <!--<DataGridColumnHeader Name="PART_TopRightCornerHeader"
                                   Grid.Column="2"
                                   Template="{StaticResource TopRightHeaderTemplate}" />-->
-            <!--<Rectangle Name="PART_ColumnHeadersAndRowsSeparator"
+            <Rectangle Name="PART_ColumnHeadersAndRowsSeparator"
                        Grid.ColumnSpan="3"
                        VerticalAlignment="Bottom"
-                       StrokeThickness="1"
                        Height="1"
-                       Fill="{DynamicResource DataGridGridLinesBrush}" />-->
-            <Border Name="PART_ColumnHeadersAndRowsSeparator"
-                    Grid.ColumnSpan="3"
-                    Height="2"
-                    VerticalAlignment="Bottom"
-                    BorderThickness="0,0,0,1"
-                    BorderBrush="{DynamicResource DataGridGridLinesBrush}" />
+                       Fill="{DynamicResource DataGridGridLinesBrush}" />
 
             <DataGridRowsPresenter Name="PART_RowsPresenter"
                                    Grid.Row="1"
@@ -642,4 +635,14 @@
       </ControlTemplate>
     </Setter>
   </Style>
+
+  <Style Selector="DataGrid:empty-columns /template/ DataGridColumnHeader#PART_TopLeftCornerHeader">
+    <Setter Property="IsVisible" Value="False" />
+  </Style>
+  <Style Selector="DataGrid:empty-columns /template/ DataGridColumnHeadersPresenter#PART_ColumnHeadersPresenter">
+    <Setter Property="IsVisible" Value="False" />
+  </Style>
+  <Style Selector="DataGrid:empty-columns /template/ Rectangle#PART_ColumnHeadersAndRowsSeparator">
+    <Setter Property="IsVisible" Value="False" />
+  </Style>
 </Styles>

src/Avalonia.Controls.DataGrid/Utils/DataGridHelper.cs

@@ -0,0 +1,22 @@
+namespace Avalonia.Controls
+{
+    internal static class DataGridHelper
+    {
+        internal static void SyncColumnProperty<T>(AvaloniaObject column, AvaloniaObject content, AvaloniaProperty<T> property)
+        {
+            SyncColumnProperty(column, content, property, property);
+        }
+
+        internal static void SyncColumnProperty<T>(AvaloniaObject column, AvaloniaObject content, AvaloniaProperty<T> contentProperty, AvaloniaProperty<T> columnProperty)
+        {
+            if (!column.IsSet(columnProperty))
+            {
+                content.ClearValue(contentProperty);
+            }
+            else
+            {
+                content.SetValue(contentProperty, column.GetValue(columnProperty));
+            }
+        }
+    }
+}

src/Avalonia.Controls/Calendar/CalendarDatePicker.cs

@@ -420,7 +420,7 @@ namespace Avalonia.Controls
                 _calendar.DayButtonMouseUp -= Calendar_DayButtonMouseUp;
                 _calendar.DisplayDateChanged -= Calendar_DisplayDateChanged;
                 _calendar.SelectedDatesChanged -= Calendar_SelectedDatesChanged;
-                _calendar.PointerPressed -= Calendar_PointerPressed;
+                _calendar.PointerReleased -= Calendar_PointerReleased;
                 _calendar.KeyDown -= Calendar_KeyDown;
             }
             _calendar = e.NameScope.Find<Calendar>(ElementCalendar);
@@ -435,7 +435,7 @@ namespace Avalonia.Controls
                 _calendar.DayButtonMouseUp += Calendar_DayButtonMouseUp;
                 _calendar.DisplayDateChanged += Calendar_DisplayDateChanged;
                 _calendar.SelectedDatesChanged += Calendar_SelectedDatesChanged;
-                _calendar.PointerPressed += Calendar_PointerPressed;
+                _calendar.PointerReleased += Calendar_PointerReleased;
                 _calendar.KeyDown += Calendar_KeyDown;
                 //_calendar.SizeChanged += new SizeChangedEventHandler(Calendar_SizeChanged);
                 //_calendar.IsTabStop = true;
@@ -831,9 +831,10 @@ namespace Avalonia.Controls
                 }
             }
         }
-        private void Calendar_PointerPressed(object sender, PointerPressedEventArgs e)
+        private void Calendar_PointerReleased(object sender, PointerReleasedEventArgs e)
         {
-            if (e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
+             
+            if (e.InitialPressMouseButton == MouseButton.Left)
             {
                 e.Handled = true;
             }

src/Avalonia.Controls/ComboBox.cs

@@ -257,7 +257,7 @@ namespace Avalonia.Controls
         }
 
         /// <inheritdoc/>
-        protected override void OnPointerPressed(PointerPressedEventArgs e)
+        protected override void OnPointerReleased(PointerReleasedEventArgs e)
         {
             if (!e.Handled)
             {
@@ -276,7 +276,7 @@ namespace Avalonia.Controls
                 }
             }
 
-            base.OnPointerPressed(e);
+            base.OnPointerReleased(e);
         }
 
         /// <inheritdoc/>

src/Avalonia.Controls/Generators/ItemContainerGenerator`1.cs

@@ -47,11 +47,7 @@ namespace Avalonia.Controls.Generators
         {
             var container = item as T;
 
-            if (item == null)
-            {
-                return null;
-            }
-            else if (container != null)
+            if (container != null)
             {
                 return container;
             }

src/Avalonia.Controls/Primitives/AccessText.cs

@@ -126,7 +126,7 @@ namespace Avalonia.Controls.Primitives
 
                     if (shapedTextCharacters.GlyphRun.Characters.End < textPosition)
                     {
-                        currentX += shapedTextCharacters.GlyphRun.Bounds.Width;
+                        currentX += shapedTextCharacters.Size.Width;
 
                         continue;
                     }
@@ -143,7 +143,7 @@ namespace Avalonia.Controls.Primitives
                         width = 0.0;
                     }
 
-                    return new Rect(currentX, currentY, width, shapedTextCharacters.GlyphRun.Bounds.Height);
+                    return new Rect(currentX, currentY, width, shapedTextCharacters.Size.Height);
                 }
             }
 

src/Avalonia.Controls/Primitives/Popup.cs

@@ -128,6 +128,7 @@ namespace Avalonia.Controls.Primitives
         public static readonly StyledProperty<bool> TopmostProperty =
             AvaloniaProperty.Register<Popup, bool>(nameof(Topmost));
 
+        private bool _isOpenRequested = false;
         private bool _isOpen;
         private bool _ignoreIsOpenChanged;
         private PopupOpenState? _openState;
@@ -361,17 +362,19 @@ namespace Avalonia.Controls.Primitives
 
             if (placementTarget == null)
             {
-                throw new InvalidOperationException("Popup has no logical parent and PlacementTarget is null");
+                _isOpenRequested = true;
+                return;
             }
             
             var topLevel = placementTarget.VisualRoot as TopLevel;
 
             if (topLevel == null)
             {
-                throw new InvalidOperationException(
-                    "Attempted to open a popup not attached to a TopLevel");
+                _isOpenRequested = true;
+                return;
             }
 
+            _isOpenRequested = false;
             var popupHost = OverlayPopupHost.CreatePopupHost(placementTarget, DependencyResolver);
 
             var handlerCleanup = new CompositeDisposable(5);
@@ -492,6 +495,17 @@ namespace Avalonia.Controls.Primitives
             return new Size();
         }
 
+
+        /// <inheritdoc/>
+        protected override void OnAttachedToVisualTree(VisualTreeAttachmentEventArgs e)
+        {
+            base.OnAttachedToVisualTree(e);
+            if (_isOpenRequested)
+            {
+                Open();
+            }
+        }
+
         /// <inheritdoc/>
         protected override void OnDetachedFromLogicalTree(LogicalTreeAttachmentEventArgs e)
         {
@@ -552,6 +566,7 @@ namespace Avalonia.Controls.Primitives
 
         private void CloseCore()
         {
+            _isOpenRequested = false;
             if (_openState is null)
             {
                 using (BeginIgnoringIsOpen())

src/Avalonia.Controls/TextBlock.cs

@@ -434,7 +434,10 @@ namespace Avalonia.Controls
 
             var padding = Padding;
 
-            TextLayout.Draw(context, new Point(padding.Left + offsetX, padding.Top));
+            using (context.PushPostTransform(Matrix.CreateTranslation(padding.Left + offsetX, padding.Top)))
+            {
+                TextLayout.Draw(context);
+            }
         }
 
         /// <summary>

src/Avalonia.Headless/HeadlessPlatformRenderInterface.cs

@@ -385,7 +385,7 @@ namespace Avalonia.Headless
                 
             }
 
-            public void DrawGlyphRun(IBrush foreground, GlyphRun glyphRun, Point baselineOrigin)
+            public void DrawGlyphRun(IBrush foreground, GlyphRun glyphRun)
             {
                 
             }

src/Avalonia.Native/Avalonia.Native.csproj

@@ -1,7 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <IsPackable>false</IsPackable>
+    <PackAvaloniaNative Condition="'$(PackAvaloniaNative)' == ''">$([MSBuild]::IsOSPlatform(OSX))</PackAvaloniaNative>
+    <IsPackable>$(PackAvaloniaNative)</IsPackable>
     <IsPackable Condition="'$([MSBuild]::IsOSPlatform(OSX))' == 'True'">true</IsPackable>
     <TargetFramework>netstandard2.0</TargetFramework>
     <CastXmlPath Condition="Exists('/usr/bin/castxml')">/usr/bin/castxml</CastXmlPath>
@@ -10,8 +11,9 @@
     <SharpGenGenerateConsumerBindMapping>false</SharpGenGenerateConsumerBindMapping>
   </PropertyGroup>
 
-  <ItemGroup Condition="'$(Configuration)' == 'Release' AND '$([MSBuild]::IsOSPlatform(OSX))' == 'true'">
+  <ItemGroup Condition="'$(PackAvaloniaNative)' == 'true'">
     <Content Include="../../Build/Products/Release/libAvalonia.Native.OSX.dylib">
+      <Link>libAvaloniaNative.dylib</Link>
       <PackagePath>runtimes/osx/native/libAvaloniaNative.dylib</PackagePath>
       <Pack>true</Pack>
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
@@ -26,4 +28,4 @@
     <ProjectReference Include="..\..\packages\Avalonia\Avalonia.csproj" />
     <ProjectReference Include="..\Avalonia.Dialogs\Avalonia.Dialogs.csproj" />
   </ItemGroup>
-</Project>
+</Project>

src/Avalonia.Themes.Default/ComboBox.xaml

@@ -26,6 +26,7 @@
     <Setter Property="Padding" Value="4" />
     <Setter Property="MinHeight" Value="20" />
     <Setter Property="PlaceholderForeground" Value="{DynamicResource ThemeForegroundBrush}" />
+    <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Disabled" />
     <Setter Property="Template">
       <ControlTemplate>
         <Border Name="border"
@@ -69,7 +70,8 @@
                    IsLightDismissEnabled="True">
               <Border BorderBrush="{DynamicResource ThemeBorderMidBrush}"
                       BorderThickness="1">
-                <ScrollViewer>
+                <ScrollViewer HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}"
+                              VerticalScrollBarVisibility="{TemplateBinding ScrollViewer.VerticalScrollBarVisibility}">
                   <ItemsPresenter Name="PART_ItemsPresenter"
                                   Items="{TemplateBinding Items}"
                                   ItemsPanel="{TemplateBinding ItemsPanel}"

src/Avalonia.Themes.Default/MenuItem.xaml

@@ -64,7 +64,7 @@
               <Border Background="{TemplateBinding Background}"
                       BorderBrush="{DynamicResource ThemeBorderMidBrush}"
                       BorderThickness="{TemplateBinding BorderThickness}">
-                <ScrollViewer>                  
+                <ScrollViewer Classes="menuscroller">                  
                     <ItemsPresenter Name="PART_ItemsPresenter"
                                     Items="{TemplateBinding Items}"
                                     ItemsPanel="{TemplateBinding ItemsPanel}"

src/Avalonia.Themes.Default/PathIcon.xaml

@@ -2,14 +2,15 @@
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
   <Style Selector="PathIcon">
     <Setter Property="Foreground" Value="{DynamicResource ThemeForegroundColor}" />
-    <Setter Property="Height" Value="16" />
-    <Setter Property="Width" Value="16" />
+    <Setter Property="Height" Value="{DynamicResource IconElementThemeHeight}" />
+    <Setter Property="Width" Value="{DynamicResource IconElementThemeWidth}" />
     <Setter Property="Template">
       <ControlTemplate>
         <Viewbox Height="{TemplateBinding Height}"
                  Width="{TemplateBinding Width}">
           <Path Fill="{TemplateBinding Foreground}"
-                Data="{TemplateBinding Data}" />
+                Data="{TemplateBinding Data}"
+                Stretch="Uniform" />
         </Viewbox>
       </ControlTemplate>
     </Setter>

src/Avalonia.Themes.Fluent/CheckBox.xaml

@@ -1,13 +1,10 @@
 <Styles xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
   <Design.PreviewWith>
     <Border Padding="20">
-      <CheckBox IsThreeState="True" IsChecked="True" />
+      <CheckBox IsThreeState="True" IsChecked="True" Content="Content" Foreground="Gold" />
     </Border>
   </Design.PreviewWith>
   <Style Selector="CheckBox">
-    <Setter Property="Background" Value="{DynamicResource CheckBoxBackgroundUnchecked}" />
-    <Setter Property="Foreground" Value="{DynamicResource CheckBoxForegroundUnchecked}" />
-    <Setter Property="BorderBrush" Value="{DynamicResource CheckBoxBorderBrushUnchecked}" />
     <Setter Property="Padding" Value="8,0,0,0" />
     <Setter Property="HorizontalAlignment" Value="Left" />
     <Setter Property="VerticalAlignment" Value="Center" />
@@ -21,10 +18,12 @@
     <Setter Property="Template">
       <ControlTemplate>
         <Grid x:Name="RootGrid" ColumnDefinitions="20,*">
-          <Border x:Name="PART_Border" Background="{TemplateBinding Background}"
-                       BorderBrush="{TemplateBinding BorderBrush}"
-                       BorderThickness="{TemplateBinding BorderThickness}"
-                        CornerRadius="{DynamicResource ControlCornerRadius}" />
+          <Border x:Name="PART_Border"
+                  Grid.ColumnSpan="2"
+                  Background="{TemplateBinding Background}"
+                  BorderBrush="{TemplateBinding BorderBrush}"
+                  BorderThickness="{TemplateBinding BorderThickness}"
+                  CornerRadius="{DynamicResource ControlCornerRadius}" />
 
           <Grid VerticalAlignment="Top" Height="32">
             <Border x:Name="NormalRectangle"
@@ -55,11 +54,11 @@
   </Style>
 
   <!-- Unchecked Normal State -->
-  <Style Selector="CheckBox /template/ ContentPresenter#ContentPresenter">
-    <Setter Property="TextBlock.Foreground" Value="{DynamicResource CheckBoxForegroundUnchecked}" />
+  <Style Selector="CheckBox">
+    <Setter Property="Foreground" Value="{DynamicResource CheckBoxForegroundUnchecked}" />
   </Style>
 
-  <Style Selector="CheckBox /template/ Border#PART_Border">
+  <Style Selector="CheckBox">
     <Setter Property="Background" Value="{DynamicResource CheckBoxBackgroundUnchecked}" />
     <Setter Property="BorderBrush" Value="{DynamicResource CheckBoxBorderBrushUnchecked}" />
   </Style>
@@ -133,11 +132,11 @@
 
 
   <!-- Checked Normal State -->
-  <Style Selector="CheckBox:checked /template/ ContentPresenter#ContentPresenter">
-    <Setter Property="TextBlock.Foreground" Value="{DynamicResource CheckBoxForegroundChecked}" />
+  <Style Selector="CheckBox:checked">
+    <Setter Property="Foreground" Value="{DynamicResource CheckBoxForegroundChecked}" />
   </Style>
 
-  <Style Selector="CheckBox:checked /template/ Border#PART_Border">
+  <Style Selector="CheckBox:checked">
     <Setter Property="Background" Value="{DynamicResource CheckBoxBackgroundChecked}" />
     <Setter Property="BorderBrush" Value="{DynamicResource CheckBoxBorderBrushChecked}" />
   </Style>
@@ -213,11 +212,11 @@
 
 
   <!-- Indeterminate Normal State -->
-  <Style Selector="CheckBox:indeterminate /template/ ContentPresenter#ContentPresenter">
-    <Setter Property="TextBlock.Foreground" Value="{DynamicResource CheckBoxForegroundIndeterminate}" />
+  <Style Selector="CheckBox:indeterminate">
+    <Setter Property="Foreground" Value="{DynamicResource CheckBoxForegroundIndeterminate}" />
   </Style>
 
-  <Style Selector="CheckBox:indeterminate /template/ Border#PART_Border">
+  <Style Selector="CheckBox:indeterminate">
     <Setter Property="Background" Value="{DynamicResource CheckBoxBackgroundIndeterminate}" />
     <Setter Property="BorderBrush" Value="{DynamicResource CheckBoxBorderBrushIndeterminate}" />
   </Style>

src/Avalonia.Themes.Fluent/ComboBox.xaml

@@ -133,7 +133,8 @@
                     Padding="{DynamicResource ComboBoxDropdownBorderPadding}"
                     HorizontalAlignment="Stretch"
                     CornerRadius="{DynamicResource OverlayCornerRadius}">
-              <ScrollViewer>
+              <ScrollViewer HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}"
+                            VerticalScrollBarVisibility="{TemplateBinding ScrollViewer.VerticalScrollBarVisibility}">
                 <ItemsPresenter Name="PART_ItemsPresenter"
                                 Items="{TemplateBinding Items}"
                                 Margin="{DynamicResource ComboBoxDropdownContentMargin}"

src/Avalonia.Themes.Fluent/ContextMenu.xaml

@@ -49,7 +49,7 @@
               MinHeight="{TemplateBinding MinHeight}"
               HorizontalAlignment="{TemplateBinding HorizontalAlignment}"
               CornerRadius="{DynamicResource OverlayCornerRadius}">
-        <ScrollViewer>
+        <ScrollViewer Classes="menuscroller">
           <ItemsPresenter Name="PART_ItemsPresenter"
                           Items="{TemplateBinding Items}"
                           ItemsPanel="{TemplateBinding ItemsPanel}"

src/Avalonia.Themes.Fluent/ListBoxItem.xaml

@@ -1,9 +1,13 @@
-<Styles xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+<Styles xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
   <Design.PreviewWith>
     <Border Padding="0">
       <ListBox>
         <ListBoxItem IsEnabled="False">Disabled</ListBoxItem>
-        <ListBoxItem>Test</ListBoxItem>
+        <ListBoxItem Background="#66000000"
+                     Padding="20">
+          Test
+        </ListBoxItem>
         <ListBoxItem>Test</ListBoxItem>
       </ListBox>
     </Border>
@@ -17,11 +21,7 @@
     <Setter Property="HorizontalContentAlignment" Value="Left" />
     <Setter Property="Template">
       <ControlTemplate>
-        <Border x:Name="LayoutRoot" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}">
-          <Panel>
-
-            <Rectangle x:Name="PressedBackground" IsHitTestVisible="False"  />
-            <ContentPresenter Name="PART_ContentPresenter"
+        <ContentPresenter Name="PART_ContentPresenter"
                           Background="{TemplateBinding Background}"
                           BorderBrush="{TemplateBinding BorderBrush}"
                           BorderThickness="{TemplateBinding BorderThickness}"
@@ -29,69 +29,66 @@
                           Content="{TemplateBinding Content}"
                           Padding="{TemplateBinding Padding}"
                           VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
-                          HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"/>
-
-          </Panel>
-        </Border>
+                          HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" />
       </ControlTemplate>
     </Setter>
   </Style>
 
-  <Style Selector="ListBoxItem /template/ ContentPresenter">
+  <Style Selector="ListBoxItem /template/ ContentPresenter#PART_ContentPresenter">
     <Setter Property="TextBlock.FontWeight" Value="Normal" />
     <Setter Property="TextBlock.FontSize" Value="{DynamicResource ControlContentThemeFontSize}" />
   </Style>
 
-  <!-- Disabled State -->  
-  <Style Selector="ListBoxItem:disabled /template/ ContentPresenter">
-    <Setter Property="TextBlock.Foreground" Value="{DynamicResource SystemControlDisabledBaseMediumLowBrush}"/>
+  <!--  Disabled State  -->
+  <Style Selector="ListBoxItem:disabled /template/ ContentPresenter#PART_ContentPresenter">
+    <Setter Property="TextBlock.Foreground" Value="{DynamicResource SystemControlDisabledBaseMediumLowBrush}" />
   </Style>
-  
-  <!-- PointerOver State -->
-  <Style Selector="ListBoxItem:pointerover /template/ Rectangle#PressedBackground">
-    <Setter Property="Fill" Value="{DynamicResource SystemControlHighlightListLowBrush}"/>
+
+  <!--  PointerOver State  -->
+  <Style Selector="ListBoxItem:pointerover /template/ ContentPresenter#PART_ContentPresenter">
+    <Setter Property="Background" Value="{DynamicResource SystemControlHighlightListLowBrush}" />
   </Style>
-  <Style Selector="ListBoxItem:pointerover /template/ ContentPresenter">
-    <Setter Property="TextBlock.Foreground" Value="{DynamicResource SystemControlHighlightAltBaseHighBrush}"/>
+  <Style Selector="ListBoxItem:pointerover /template/ ContentPresenter#PART_ContentPresenter">
+    <Setter Property="TextBlock.Foreground" Value="{DynamicResource SystemControlHighlightAltBaseHighBrush}" />
   </Style>
 
-  <!-- Pressed State -->
-  <Style Selector="ListBoxItem:pressed /template/ Rectangle#PressedBackground">
-    <Setter Property="Fill" Value="{DynamicResource SystemControlHighlightListMediumBrush}"/>
+  <!--  Pressed State  -->
+  <Style Selector="ListBoxItem:pressed /template/ ContentPresenter#PART_ContentPresenter">
+    <Setter Property="Background" Value="{DynamicResource SystemControlHighlightListMediumBrush}" />
   </Style>
   <Style Selector="ListBoxItem:pressed /template/ ContentPresenter">
-    <Setter Property="TextBlock.Foreground" Value="{DynamicResource SystemControlHighlightAltBaseHighBrush}"/>
+    <Setter Property="TextBlock.Foreground" Value="{DynamicResource SystemControlHighlightAltBaseHighBrush}" />
   </Style>
 
-  <!-- Selected State -->
-  <Style Selector="ListBoxItem:selected /template/ Rectangle#PressedBackground">
-    <Setter Property="Fill" Value="{DynamicResource SystemControlHighlightListAccentLowBrush}"/>
+  <!--  Selected State  -->
+  <Style Selector="ListBoxItem:selected /template/ ContentPresenter#PART_ContentPresenter">
+    <Setter Property="Background" Value="{DynamicResource SystemControlHighlightListAccentLowBrush}" />
   </Style>
   <Style Selector="ListBoxItem:selected /template/ ContentPresenter">
-    <Setter Property="TextBlock.Foreground" Value="{DynamicResource SystemControlHighlightAltBaseHighBrush}"/>
+    <Setter Property="TextBlock.Foreground" Value="{DynamicResource SystemControlHighlightAltBaseHighBrush}" />
   </Style>
-  
-  <!-- Selected Unfocused State -->
-  <Style Selector="ListBoxItem:selected:not(:focus) /template/ Rectangle#PressedBackground">
-    <Setter Property="Fill" Value="{DynamicResource SystemControlHighlightListAccentLowBrush}"/>
+
+  <!--  Selected Unfocused State  -->
+  <Style Selector="ListBoxItem:selected:not(:focus) /template/ ContentPresenter#PART_ContentPresenter">
+    <Setter Property="Background" Value="{DynamicResource SystemControlHighlightListAccentLowBrush}" />
   </Style>
-  <Style Selector="ListBoxItem:selected:not(:focus) /template/ ContentPresenter">
-    <Setter Property="TextBlock.Foreground" Value="{DynamicResource SystemControlHighlightAltBaseHighBrush}"/>
+  <Style Selector="ListBoxItem:selected:not(:focus) /template/ ContentPresenter#PART_ContentPresenter">
+    <Setter Property="TextBlock.Foreground" Value="{DynamicResource SystemControlHighlightAltBaseHighBrush}" />
   </Style>
 
-  <!-- Selected PointerOver State -->
-  <Style Selector="ListBoxItem:selected:pointerover /template/ Rectangle#PressedBackground">
-    <Setter Property="Fill" Value="{DynamicResource SystemControlHighlightListAccentMediumBrush}"/>
+  <!--  Selected PointerOver State  -->
+  <Style Selector="ListBoxItem:selected:pointerover /template/ ContentPresenter#PART_ContentPresenter">
+    <Setter Property="Background" Value="{DynamicResource SystemControlHighlightListAccentMediumBrush}" />
   </Style>
   <Style Selector="ListBoxItem:selected:pointerover /template/ ContentPresenter">
-    <Setter Property="TextBlock.Foreground" Value="{DynamicResource SystemControlHighlightAltBaseHighBrush}"/>
+    <Setter Property="TextBlock.Foreground" Value="{DynamicResource SystemControlHighlightAltBaseHighBrush}" />
   </Style>
 
-<!-- Selected Pressed State -->
-  <Style Selector="ListBoxItem:selected:pressed /template/ Rectangle#PressedBackground">
-    <Setter Property="Fill" Value="{DynamicResource SystemControlHighlightListAccentHighBrush}"/>
+  <!--  Selected Pressed State  -->
+  <Style Selector="ListBoxItem:selected:pressed /template/ ContentPresenter#PART_ContentPresenter">
+    <Setter Property="Background" Value="{DynamicResource SystemControlHighlightListAccentHighBrush}" />
   </Style>
-  <Style Selector="ListBoxItem:selected:pressed /template/ ContentPresenter">
-    <Setter Property="TextBlock.Foreground" Value="{DynamicResource SystemControlHighlightAltBaseHighBrush}"/>
+  <Style Selector="ListBoxItem:selected:pressed /template/ ContentPresenter#PART_ContentPresenter">
+    <Setter Property="TextBlock.Foreground" Value="{DynamicResource SystemControlHighlightAltBaseHighBrush}" />
   </Style>
 </Styles>

src/Avalonia.Themes.Fluent/MenuItem.xaml

@@ -123,7 +123,7 @@
                     MinHeight="{DynamicResource MenuFlyoutThemeMinHeight}"
                     HorizontalAlignment="Stretch"
                     CornerRadius="{DynamicResource OverlayCornerRadius}">
-              <ScrollViewer>
+              <ScrollViewer Classes="menuscroller">
                 <ItemsPresenter Name="PART_ItemsPresenter"
                                 Items="{TemplateBinding Items}"
                                 ItemsPanel="{TemplateBinding ItemsPanel}"
@@ -171,7 +171,7 @@
                       MinHeight="{DynamicResource MenuFlyoutThemeMinHeight}"
                       HorizontalAlignment="Stretch"
                       CornerRadius="{DynamicResource OverlayCornerRadius}">
-                <ScrollViewer>
+                <ScrollViewer Classes="menuscroller">
                   <ItemsPresenter Name="PART_ItemsPresenter"
                                   Items="{TemplateBinding Items}"
                                   ItemsPanel="{TemplateBinding ItemsPanel}"

src/Avalonia.Themes.Fluent/PathIcon.xaml

@@ -10,14 +10,15 @@
   </Design.PreviewWith>
   <Style Selector="PathIcon">
     <Setter Property="Foreground" Value="{DynamicResource TextControlForeground}" />
-    <Setter Property="Height" Value="16" />
-    <Setter Property="Width" Value="16" />
+    <Setter Property="Height" Value="{DynamicResource IconElementThemeHeight}" />
+    <Setter Property="Width" Value="{DynamicResource IconElementThemeWidth}" />
     <Setter Property="Template">
       <ControlTemplate>
         <Viewbox Height="{TemplateBinding Height}"
                  Width="{TemplateBinding Width}">
           <Path Fill="{TemplateBinding Foreground}"
-                Data="{TemplateBinding Data}" />
+                Data="{TemplateBinding Data}"
+                Stretch="Uniform" />
         </Viewbox>
       </ControlTemplate>
     </Setter>

src/Avalonia.Themes.Fluent/ScrollViewer.xaml

@@ -1,5 +1,21 @@
-<Styles xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+<Styles xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:converters="clr-namespace:Avalonia.Controls.Converters;assembly=Avalonia.Controls">
 
+  <Design.PreviewWith>
+    <Grid ColumnDefinitions="*,20,*"
+          Height="300"
+          Width="200"
+          Margin="20">
+      <ScrollViewer>
+        <Border Height="1000" Background="#ccc"/>
+      </ScrollViewer>
+      <ScrollViewer Grid.Column="2" Classes="menuscroller">
+        <Border Height="1000" Background="#ccc"/>
+      </ScrollViewer>
+    </Grid>
+  </Design.PreviewWith>
+  
   <Style Selector="ScrollViewer">
     <Setter Property="Background"
             Value="Transparent" />
@@ -66,4 +82,78 @@
     <Setter Property="Opacity" Value="1" />
   </Style>
 
+  <Style Selector="ScrollViewer.menuscroller">
+    <Setter Property="Template">
+      <ControlTemplate>
+        <DockPanel>
+          <RepeatButton DockPanel.Dock="Top"
+                        BorderThickness="0"
+                        Background="Transparent"
+                        HorizontalAlignment="Stretch"
+                        HorizontalContentAlignment="Center"
+                        RenderTransform="{x:Null}"
+                        Command="{Binding LineUp, RelativeSource={RelativeSource TemplatedParent}}">
+            <RepeatButton.IsVisible>
+              <MultiBinding Converter="{x:Static converters:MenuScrollingVisibilityConverter.Instance}"
+                            ConverterParameter="0">
+                <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="VerticalScrollBarVisibility"/>
+                <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="Offset.Y"/>
+                <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="Extent.Height"/>
+                <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="Viewport.Height"/>
+              </MultiBinding>
+            </RepeatButton.IsVisible>
+            <Viewbox Width="{DynamicResource ScrollBarButtonArrowIconFontSize}"
+                     Height="{DynamicResource ScrollBarButtonArrowIconFontSize}">
+              <Path VerticalAlignment="Center"
+                    HorizontalAlignment="Center"
+                    Data="M 19.091797 14.970703 L 10 5.888672 L 0.908203 14.970703 L 0.029297 14.091797 L 10 4.111328 L 19.970703 14.091797 Z"
+                    Width="20"
+                    Height="20" />
+            </Viewbox>
+          </RepeatButton>
+          <RepeatButton DockPanel.Dock="Bottom"
+                        BorderThickness="0"
+                        Background="Transparent"
+                        HorizontalAlignment="Stretch"
+                        HorizontalContentAlignment="Center"
+                        RenderTransform="{x:Null}"
+                        Command="{Binding LineDown, RelativeSource={RelativeSource TemplatedParent}}">
+            <RepeatButton.IsVisible>
+              <MultiBinding Converter="{x:Static converters:MenuScrollingVisibilityConverter.Instance}"
+                            ConverterParameter="100">
+                <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="VerticalScrollBarVisibility"/>
+                <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="Offset.Y"/>
+                <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="Extent.Height"/>
+                <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="Viewport.Height"/>
+              </MultiBinding>
+            </RepeatButton.IsVisible>
+            <Viewbox Width="{DynamicResource ScrollBarButtonArrowIconFontSize}"
+                     Height="{DynamicResource ScrollBarButtonArrowIconFontSize}">
+              <Path VerticalAlignment="Center"
+                    HorizontalAlignment="Center"
+                    Data="M 18.935547 4.560547 L 19.814453 5.439453 L 10 15.253906 L 0.185547 5.439453 L 1.064453 4.560547 L 10 13.496094 Z"
+                    Width="20"
+                    Height="20" />
+            </Viewbox>
+          </RepeatButton>
+          <ScrollContentPresenter Name="PART_ContentPresenter"
+                                  CanHorizontallyScroll="{TemplateBinding CanHorizontallyScroll}"
+                                  CanVerticallyScroll="{TemplateBinding CanVerticallyScroll}"
+                                  Content="{TemplateBinding Content}"
+                                  Extent="{TemplateBinding Extent, Mode=TwoWay}"
+                                  Margin="{TemplateBinding Padding}"
+                                  Offset="{TemplateBinding Offset, Mode=TwoWay}"
+                                  Viewport="{TemplateBinding Viewport, Mode=TwoWay}"/>
+        </DockPanel>
+      </ControlTemplate>
+    </Setter>
+  </Style>
+  <Style Selector="ScrollViewer.menuscroller /template/ RepeatButton > Viewbox > Path">
+    <Setter Property="Fill" Value="{DynamicResource ScrollBarButtonArrowForeground}" />
+  </Style>
+
+  <Style Selector="ScrollViewer.menuscroller /template/ RepeatButton:pointerover > Viewbox > Path">
+    <Setter Property="Fill" Value="{DynamicResource ScrollBarButtonArrowForegroundPointerOver}" />
+  </Style>
+
 </Styles>

src/Avalonia.Visuals/ApiCompatBaseline.txt

@@ -1,15 +1,33 @@
 Compat issues with assembly Avalonia.Visuals:
+MembersMustExist : Member 'public void Avalonia.Media.DrawingContext.DrawGlyphRun(Avalonia.Media.IBrush, Avalonia.Media.GlyphRun, Avalonia.Point)' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'public Avalonia.Media.Typeface Avalonia.Media.FontManager.GetOrAddTypeface(Avalonia.Media.FontFamily, Avalonia.Media.FontStyle, Avalonia.Media.FontWeight)' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'public Avalonia.Media.Typeface Avalonia.Media.FontManager.MatchCharacter(System.Int32, Avalonia.Media.FontStyle, Avalonia.Media.FontWeight, Avalonia.Media.FontFamily, System.Globalization.CultureInfo)' does not exist in the implementation but it does exist in the contract.
+MembersMustExist : Member 'public Avalonia.Rect Avalonia.Media.GlyphRun.Bounds.get()' does not exist in the implementation but it does exist in the contract.
+MembersMustExist : Member 'public Avalonia.StyledProperty<Avalonia.Point> Avalonia.StyledProperty<Avalonia.Point> Avalonia.Media.GlyphRunDrawing.BaselineOriginProperty' does not exist in the implementation but it does exist in the contract.
+MembersMustExist : Member 'public Avalonia.Point Avalonia.Media.GlyphRunDrawing.BaselineOrigin.get()' does not exist in the implementation but it does exist in the contract.
+MembersMustExist : Member 'public void Avalonia.Media.GlyphRunDrawing.BaselineOrigin.set(Avalonia.Point)' does not exist in the implementation but it does exist in the contract.
 CannotSealType : Type 'Avalonia.Media.Typeface' is actually (has the sealed modifier) sealed in the implementation but not sealed in the contract.
 TypeCannotChangeClassification : Type 'Avalonia.Media.Typeface' is a 'struct' in the implementation but is a 'class' in the contract.
 CannotMakeMemberNonVirtual : Member 'public System.Boolean Avalonia.Media.Typeface.Equals(System.Object)' is non-virtual in the implementation but is virtual in the contract.
 CannotMakeMemberNonVirtual : Member 'public System.Int32 Avalonia.Media.Typeface.GetHashCode()' is non-virtual in the implementation but is virtual in the contract.
 TypesMustExist : Type 'Avalonia.Media.Fonts.FontKey' does not exist in the implementation but it does exist in the contract.
+CannotAddAbstractMembers : Member 'public Avalonia.Size Avalonia.Media.TextFormatting.DrawableTextRun.Size' is abstract in the implementation but is missing in the contract.
+MembersMustExist : Member 'public Avalonia.Rect Avalonia.Media.TextFormatting.DrawableTextRun.Bounds.get()' does not exist in the implementation but it does exist in the contract.
+CannotAddAbstractMembers : Member 'public void Avalonia.Media.TextFormatting.DrawableTextRun.Draw(Avalonia.Media.DrawingContext)' is abstract in the implementation but is missing in the contract.
+MembersMustExist : Member 'public void Avalonia.Media.TextFormatting.DrawableTextRun.Draw(Avalonia.Media.DrawingContext, Avalonia.Point)' does not exist in the implementation but it does exist in the contract.
+CannotAddAbstractMembers : Member 'public Avalonia.Size Avalonia.Media.TextFormatting.DrawableTextRun.Size.get()' is abstract in the implementation but is missing in the contract.
+MembersMustExist : Member 'public Avalonia.Rect Avalonia.Media.TextFormatting.ShapedTextCharacters.Bounds.get()' does not exist in the implementation but it does exist in the contract.
+MembersMustExist : Member 'public void Avalonia.Media.TextFormatting.ShapedTextCharacters.Draw(Avalonia.Media.DrawingContext, Avalonia.Point)' does not exist in the implementation but it does exist in the contract.
+MembersMustExist : Member 'public void Avalonia.Media.TextFormatting.TextLayout.Draw(Avalonia.Media.DrawingContext, Avalonia.Point)' does not exist in the implementation but it does exist in the contract.
 CannotAddAbstractMembers : Member 'public Avalonia.Media.TextFormatting.TextLineBreak Avalonia.Media.TextFormatting.TextLine.TextLineBreak' is abstract in the implementation but is missing in the contract.
+CannotAddAbstractMembers : Member 'public void Avalonia.Media.TextFormatting.TextLine.Draw(Avalonia.Media.DrawingContext)' is abstract in the implementation but is missing in the contract.
+MembersMustExist : Member 'public void Avalonia.Media.TextFormatting.TextLine.Draw(Avalonia.Media.DrawingContext, Avalonia.Point)' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'public Avalonia.Media.TextFormatting.TextLineBreak Avalonia.Media.TextFormatting.TextLine.LineBreak.get()' does not exist in the implementation but it does exist in the contract.
 CannotAddAbstractMembers : Member 'public Avalonia.Media.TextFormatting.TextLineBreak Avalonia.Media.TextFormatting.TextLine.TextLineBreak.get()' is abstract in the implementation but is missing in the contract.
+InterfacesShouldHaveSameMembers : Interface member 'public void Avalonia.Platform.IDrawingContextImpl.DrawGlyphRun(Avalonia.Media.IBrush, Avalonia.Media.GlyphRun)' is present in the implementation but not in the contract.
+InterfacesShouldHaveSameMembers : Interface member 'public void Avalonia.Platform.IDrawingContextImpl.DrawGlyphRun(Avalonia.Media.IBrush, Avalonia.Media.GlyphRun, Avalonia.Point)' is present in the contract but not in the implementation.
+MembersMustExist : Member 'public void Avalonia.Platform.IDrawingContextImpl.DrawGlyphRun(Avalonia.Media.IBrush, Avalonia.Media.GlyphRun, Avalonia.Point)' does not exist in the implementation but it does exist in the contract.
 InterfacesShouldHaveSameMembers : Interface member 'public System.Boolean Avalonia.Platform.IFontManagerImpl.TryMatchCharacter(System.Int32, Avalonia.Media.FontStyle, Avalonia.Media.FontWeight, Avalonia.Media.FontFamily, System.Globalization.CultureInfo, Avalonia.Media.Fonts.FontKey)' is present in the contract but not in the implementation.
 MembersMustExist : Member 'public System.Boolean Avalonia.Platform.IFontManagerImpl.TryMatchCharacter(System.Int32, Avalonia.Media.FontStyle, Avalonia.Media.FontWeight, Avalonia.Media.FontFamily, System.Globalization.CultureInfo, Avalonia.Media.Fonts.FontKey)' does not exist in the implementation but it does exist in the contract.
 InterfacesShouldHaveSameMembers : Interface member 'public System.Boolean Avalonia.Platform.IFontManagerImpl.TryMatchCharacter(System.Int32, Avalonia.Media.FontStyle, Avalonia.Media.FontWeight, Avalonia.Media.FontFamily, System.Globalization.CultureInfo, Avalonia.Media.Typeface)' is present in the implementation but not in the contract.
-Total Issues: 13
+Total Issues: 31

src/Avalonia.Visuals/Media/DrawingContext.cs

@@ -206,14 +206,13 @@ namespace Avalonia.Media
         /// </summary>
         /// <param name="foreground">The foreground brush.</param>
         /// <param name="glyphRun">The glyph run.</param>
-        /// <param name="baselineOrigin">The baseline origin of the glyph run.</param>
-        public void DrawGlyphRun(IBrush foreground, GlyphRun glyphRun, Point baselineOrigin)
+        public void DrawGlyphRun(IBrush foreground, GlyphRun glyphRun)
         {
             Contract.Requires<ArgumentNullException>(glyphRun != null);
 
             if (foreground != null)
             {
-                PlatformImpl.DrawGlyphRun(foreground, glyphRun, baselineOrigin);
+                PlatformImpl.DrawGlyphRun(foreground, glyphRun);
             }
         }
 

src/Avalonia.Visuals/Media/GlyphRun.cs

@@ -16,8 +16,9 @@ namespace Avalonia.Media
         private IGlyphRunImpl _glyphRunImpl;
         private GlyphTypeface _glyphTypeface;
         private double _fontRenderingEmSize;
-        private Rect? _bounds;
+        private Size? _size;
         private int _biDiLevel;
+        private Point? _baselineOrigin;
 
         private ReadOnlySlice<ushort> _glyphIndices;
         private ReadOnlySlice<double> _glyphAdvances;
@@ -89,6 +90,20 @@ namespace Avalonia.Media
             set => Set(ref _fontRenderingEmSize, value);
         }
 
+        /// <summary>
+        ///     Gets or sets the baseline origin of the<see cref="GlyphRun"/>.
+        /// </summary>
+        public Point BaselineOrigin
+        {
+            get
+            {
+                _baselineOrigin ??= CalculateBaselineOrigin();
+
+                return _baselineOrigin.Value;
+            }
+            set => Set(ref _baselineOrigin, value);
+        }
+
         /// <summary>
         ///     Gets or sets an array of <see cref="ushort"/> values that represent the glyph indices in the rendering physical font.
         /// </summary>
@@ -156,16 +171,13 @@ namespace Avalonia.Media
         /// <summary>
         ///     Gets or sets the conservative bounding box of the <see cref="GlyphRun"/>.
         /// </summary>
-        public Rect Bounds
+        public Size Size
         {
             get
             {
-                if (_bounds == null)
-                {
-                    _bounds = CalculateBounds();
-                }
+                _size ??= CalculateSize();
 
-                return _bounds.Value;
+                return _size.Value;
             }
         }
 
@@ -200,7 +212,7 @@ namespace Avalonia.Media
 
             if (characterHit.FirstCharacterIndex + characterHit.TrailingLength > Characters.End)
             {
-                return Bounds.Width;
+                return Size.Width;
             }
 
             var glyphIndex = FindGlyphIndex(characterHit.FirstCharacterIndex);
@@ -257,7 +269,7 @@ namespace Avalonia.Media
             }
 
             //After
-            if (distance > Bounds.Size.Width)
+            if (distance > Size.Width)
             {
                 isInside = false;
 
@@ -529,12 +541,21 @@ namespace Avalonia.Media
         }
 
         /// <summary>
-        /// Calculates the bounds of the <see cref="GlyphRun"/>.
+        /// Calculates the default baseline origin of the <see cref="GlyphRun"/>.
+        /// </summary>
+        /// <returns>The baseline origin.</returns>
+        private Point CalculateBaselineOrigin()
+        {
+            return new Point(0, -GlyphTypeface.Ascent * Scale);
+        }
+
+        /// <summary>
+        /// Calculates the size of the <see cref="GlyphRun"/>.
         /// </summary>
         /// <returns>
         /// The calculated bounds.
         /// </returns>
-        private Rect CalculateBounds()
+        private Size CalculateSize()
         {
             var height = (GlyphTypeface.Descent - GlyphTypeface.Ascent + GlyphTypeface.LineGap) * Scale;
 
@@ -555,7 +576,7 @@ namespace Avalonia.Media
                 }
             }
 
-            return new Rect(0, GlyphTypeface.Ascent * Scale, width, height);
+            return new Size(width, height);
         }
 
         private void Set<T>(ref T field, T value)
@@ -590,11 +611,15 @@ namespace Avalonia.Media
                 throw new InvalidOperationException();
             }
 
+            _baselineOrigin = new Point(0, -GlyphTypeface.Ascent * Scale);
+
             var platformRenderInterface = AvaloniaLocator.Current.GetService<IPlatformRenderInterface>();
 
             _glyphRunImpl = platformRenderInterface.CreateGlyphRun(this, out var width);
 
             var height = (GlyphTypeface.Descent - GlyphTypeface.Ascent + GlyphTypeface.LineGap) * Scale;
+
+            _size = new Size(width, height);
         }
 
         void IDisposable.Dispose()

src/Avalonia.Visuals/Media/GlyphRunDrawing.cs

@@ -8,9 +8,6 @@
         public static readonly StyledProperty<GlyphRun> GlyphRunProperty =
             AvaloniaProperty.Register<GlyphRunDrawing, GlyphRun>(nameof(GlyphRun));
 
-        public static readonly StyledProperty<Point> BaselineOriginProperty =
-            AvaloniaProperty.Register<GlyphRunDrawing, Point>(nameof(BaselineOrigin));
-
         public IBrush Foreground
         {
             get => GetValue(ForegroundProperty);
@@ -23,12 +20,6 @@
             set => SetValue(GlyphRunProperty, value);
         }
 
-        public Point BaselineOrigin
-        {
-            get => GetValue(BaselineOriginProperty);
-            set => SetValue(BaselineOriginProperty, value);
-        }
-
         public override void Draw(DrawingContext context)
         {
             if (GlyphRun == null)
@@ -36,12 +27,12 @@
                 return;
             }
 
-            context.DrawGlyphRun(Foreground, GlyphRun, BaselineOrigin);
+            context.DrawGlyphRun(Foreground, GlyphRun);
         }
 
         public override Rect GetBounds()
         {
-            return GlyphRun?.Bounds ?? default;
+            return GlyphRun != null ? new Rect(GlyphRun.Size) : Rect.Empty;
         }
     }
 }

src/Avalonia.Visuals/Media/TextDecoration.cs

@@ -155,8 +155,7 @@ namespace Avalonia.Media
         /// </summary>
         /// <param name="drawingContext">The drawing context.</param>
         /// <param name="shapedTextCharacters">The shaped characters that are decorated.</param>
-        /// <param name="origin">The origin.</param>
-        internal void Draw(DrawingContext drawingContext, ShapedTextCharacters shapedTextCharacters, Point origin)
+        internal void Draw(DrawingContext drawingContext, ShapedTextCharacters shapedTextCharacters)
         {
             var fontRenderingEmSize = shapedTextCharacters.Properties.FontRenderingEmSize;
             var fontMetrics = shapedTextCharacters.FontMetrics;
@@ -181,16 +180,20 @@ namespace Avalonia.Media
                     break;
             }
 
+            var origin = new Point();
+
             switch (Location)
             {
-                case TextDecorationLocation.Overline:
-                    origin += new Point(0, fontMetrics.Ascent);
+                case TextDecorationLocation.Baseline:
+                    origin += shapedTextCharacters.GlyphRun.BaselineOrigin;
                     break;
                 case TextDecorationLocation.Strikethrough:
-                    origin += new Point(0, -fontMetrics.StrikethroughPosition);
+                    origin += new Point(shapedTextCharacters.GlyphRun.BaselineOrigin.X,
+                        shapedTextCharacters.GlyphRun.BaselineOrigin.Y - fontMetrics.StrikethroughPosition);
                     break;
                 case TextDecorationLocation.Underline:
-                    origin += new Point(0, -fontMetrics.UnderlinePosition);
+                    origin += new Point(shapedTextCharacters.GlyphRun.BaselineOrigin.X,
+                        shapedTextCharacters.GlyphRun.BaselineOrigin.Y - fontMetrics.UnderlinePosition);
                     break;
             }
 
@@ -207,7 +210,7 @@ namespace Avalonia.Media
             var pen = new Pen(Stroke ?? shapedTextCharacters.Properties.ForegroundBrush, thickness,
                 new DashStyle(StrokeDashArray, StrokeDashOffset), StrokeLineCap);
 
-            drawingContext.DrawLine(pen, origin, origin + new Point(shapedTextCharacters.Bounds.Width, 0));
+            drawingContext.DrawLine(pen, origin, origin + new Point(shapedTextCharacters.Size.Width, 0));
         }
     }
 }

src/Avalonia.Visuals/Media/TextFormatting/DrawableTextRun.cs

@@ -6,15 +6,14 @@
     public abstract class DrawableTextRun : TextRun
     {
         /// <summary>
-        /// Gets the bounds.
+        /// Gets the size.
         /// </summary>
-        public abstract Rect Bounds { get; }
+        public abstract Size Size { get; }
 
         /// <summary>
         /// Draws the <see cref="DrawableTextRun"/> at the given origin.
         /// </summary>
         /// <param name="drawingContext">The drawing context.</param>
-        /// <param name="origin">The origin.</param>
-        public abstract void Draw(DrawingContext drawingContext, Point origin);
+        public abstract void Draw(DrawingContext drawingContext);
     }
 }

src/Avalonia.Visuals/Media/TextFormatting/ShapedTextCharacters.cs

@@ -26,7 +26,7 @@ namespace Avalonia.Media.TextFormatting
         public override int TextSourceLength { get; }
 
         /// <inheritdoc/>
-        public override Rect Bounds => GlyphRun.Bounds;
+        public override Size Size => GlyphRun.Size;
 
         /// <summary>
         /// Gets the font metrics.
@@ -45,7 +45,7 @@ namespace Avalonia.Media.TextFormatting
         public GlyphRun GlyphRun { get; }
 
         /// <inheritdoc/>
-        public override void Draw(DrawingContext drawingContext, Point origin)
+        public override void Draw(DrawingContext drawingContext)
         {
             if (GlyphRun.GlyphIndices.Length == 0)
             {
@@ -64,11 +64,10 @@ namespace Avalonia.Media.TextFormatting
 
             if (Properties.BackgroundBrush != null)
             {
-                drawingContext.DrawRectangle(Properties.BackgroundBrush, null,
-                new Rect(origin.X, origin.Y + FontMetrics.Ascent, Bounds.Width, Bounds.Height));
+                drawingContext.DrawRectangle(Properties.BackgroundBrush, null, new Rect(Size));
             }
 
-            drawingContext.DrawGlyphRun(Properties.ForegroundBrush, GlyphRun, origin);
+            drawingContext.DrawGlyphRun(Properties.ForegroundBrush, GlyphRun);
 
             if (Properties.TextDecorations == null)
             {
@@ -77,7 +76,7 @@ namespace Avalonia.Media.TextFormatting
 
             foreach (var textDecoration in Properties.TextDecorations)
             {
-                textDecoration.Draw(drawingContext, this, origin);
+                textDecoration.Draw(drawingContext, this);
             }
         }
 

src/Avalonia.Visuals/Media/TextFormatting/TextFormatterImpl.cs

@@ -52,7 +52,7 @@ namespace Avalonia.Media.TextFormatting
         {
             var glyphRun = textCharacters.GlyphRun;
 
-            if (glyphRun.Bounds.Width < availableWidth)
+            if (glyphRun.Size.Width < availableWidth)
             {
                 return glyphRun.Characters.Length;
             }
@@ -348,7 +348,7 @@ namespace Avalonia.Media.TextFormatting
             {
                 var currentRun = textRuns[runIndex];
 
-                if (currentWidth + currentRun.GlyphRun.Bounds.Width > availableWidth)
+                if (currentWidth + currentRun.Size.Width > availableWidth)
                 {
                     var measuredLength = MeasureCharacters(currentRun, paragraphWidth - currentWidth);
 
@@ -421,7 +421,7 @@ namespace Avalonia.Media.TextFormatting
                     return new TextLineImpl(splitResult.First, textLineMetrics, lineBreak);
                 }
 
-                currentWidth += currentRun.GlyphRun.Bounds.Width;
+                currentWidth += currentRun.Size.Width;
 
                 currentLength += currentRun.GlyphRun.Characters.Length;
 

src/Avalonia.Visuals/Media/TextFormatting/TextLayout.cs

@@ -115,22 +115,24 @@ namespace Avalonia.Media.TextFormatting
         /// Draws the text layout.
         /// </summary>
         /// <param name="context">The drawing context.</param>
-        /// <param name="origin">The origin.</param>
-        public void Draw(DrawingContext context, Point origin)
+        public void Draw(DrawingContext context)
         {
             if (!TextLines.Any())
             {
                 return;
             }
 
-            var currentY = origin.Y;
+            var currentY = 0.0;
 
             foreach (var textLine in TextLines)
             {
                 var offsetX = TextLine.GetParagraphOffsetX(textLine.LineMetrics.Size.Width, Size.Width,
                     _paragraphProperties.TextAlignment);
 
-                textLine.Draw(context, new Point(origin.X + offsetX, currentY));
+                using (context.PushPostTransform(Matrix.CreateTranslation(offsetX, currentY)))
+                {
+                    textLine.Draw(context);
+                }
 
                 currentY += textLine.LineMetrics.Size.Height;
             }

src/Avalonia.Visuals/Media/TextFormatting/TextLine.cs

@@ -51,8 +51,7 @@ namespace Avalonia.Media.TextFormatting
         /// Draws the <see cref="TextLine"/> at the given origin.
         /// </summary>
         /// <param name="drawingContext">The drawing context.</param>
-        /// <param name="origin">The origin.</param>
-        public abstract void Draw(DrawingContext drawingContext, Point origin);
+        public abstract void Draw(DrawingContext drawingContext);
 
         /// <summary>
         /// Create a collapsed line based on collapsed text properties.

src/Avalonia.Visuals/Media/TextFormatting/TextLineImpl.cs

@@ -33,17 +33,18 @@ namespace Avalonia.Media.TextFormatting
         public override bool HasCollapsed { get; }
 
         /// <inheritdoc/>
-        public override void Draw(DrawingContext drawingContext, Point origin)
+        public override void Draw(DrawingContext drawingContext)
         {
-            var currentX = origin.X;
+            var currentX = 0.0;
 
             foreach (var textRun in _textRuns)
             {
-                var baselineOrigin = new Point(currentX, origin.Y + LineMetrics.TextBaseline);
-
-                textRun.Draw(drawingContext, baselineOrigin);
+                using (drawingContext.PushPostTransform(Matrix.CreateTranslation(currentX, 0)))
+                {
+                    textRun.Draw(drawingContext);
+                }
 
-                currentX += textRun.Bounds.Width;
+                currentX += textRun.Size.Width;
             }
         }
 
@@ -64,13 +65,13 @@ namespace Avalonia.Media.TextFormatting
 
             var shapedSymbol = CreateShapedSymbol(collapsingProperties.Symbol);
 
-            var availableWidth = collapsingProperties.Width - shapedSymbol.Bounds.Width;
+            var availableWidth = collapsingProperties.Width - shapedSymbol.Size.Width;
 
             while (runIndex < _textRuns.Count)
             {
                 var currentRun = _textRuns[runIndex];
 
-                currentWidth += currentRun.GlyphRun.Bounds.Width;
+                currentWidth += currentRun.Size.Width;
 
                 if (currentWidth > availableWidth)
                 {
@@ -125,7 +126,7 @@ namespace Avalonia.Media.TextFormatting
                     return new TextLineImpl(shapedTextCharacters, textLineMetrics, TextLineBreak, true);
                 }
 
-                availableWidth -= currentRun.GlyphRun.Bounds.Width;
+                availableWidth -= currentRun.Size.Width;
 
                 collapsedLength += currentRun.GlyphRun.Characters.Length;
 
@@ -133,7 +134,7 @@ namespace Avalonia.Media.TextFormatting
             }
 
             textLineMetrics =
-                new TextLineMetrics(LineMetrics.Size.WithWidth(LineMetrics.Size.Width + shapedSymbol.Bounds.Width),
+                new TextLineMetrics(LineMetrics.Size.WithWidth(LineMetrics.Size.Width + shapedSymbol.Size.Width),
                     LineMetrics.TextBaseline, TextRange, LineMetrics.HasOverflowed);
 
             return new TextLineImpl(new List<ShapedTextCharacters>(_textRuns) { shapedSymbol }, textLineMetrics, null,
@@ -156,12 +157,12 @@ namespace Avalonia.Media.TextFormatting
             {
                 characterHit = run.GlyphRun.GetCharacterHitFromDistance(distance, out _);
 
-                if (distance <= run.Bounds.Width)
+                if (distance <= run.Size.Width)
                 {
                     break;
                 }
 
-                distance -= run.Bounds.Width;
+                distance -= run.Size.Width;
             }
 
             return characterHit;
@@ -229,7 +230,7 @@ namespace Avalonia.Media.TextFormatting
             {
                 if (codepointIndex > textRun.Text.End)
                 {
-                    currentDistance += textRun.Bounds.Width;
+                    currentDistance += textRun.Size.Width;
 
                     continue;
                 }
@@ -405,7 +406,7 @@ namespace Avalonia.Media.TextFormatting
 
             for (var i = 0; i < shapedTextCharacters.Count; i++)
             {
-                shapedWidth += shapedTextCharacters[i].Bounds.Width;
+                shapedWidth += shapedTextCharacters[i].Size.Width;
             }
 
             return shapedWidth;

src/Avalonia.Visuals/Media/TextFormatting/TextLineMetrics.cs

@@ -67,7 +67,7 @@ namespace Avalonia.Media.TextFormatting
                 var fontMetrics =
                     new FontMetrics(shapedRun.Properties.Typeface, shapedRun.Properties.FontRenderingEmSize);
 
-                lineWidth += shapedRun.Bounds.Width;
+                lineWidth += shapedRun.Size.Width;
 
                 if (ascent > fontMetrics.Ascent)
                 {

src/Avalonia.Visuals/Platform/IDrawingContextImpl.cs

@@ -84,8 +84,7 @@ namespace Avalonia.Platform
         /// </summary>
         /// <param name="foreground">The foreground.</param>
         /// <param name="glyphRun">The glyph run.</param>
-        /// <param name="baselineOrigin">The baseline origin of the glyph run.</param>
-        void DrawGlyphRun(IBrush foreground, GlyphRun glyphRun, Point baselineOrigin);
+        void DrawGlyphRun(IBrush foreground, GlyphRun glyphRun);
 
         /// <summary>
         /// Creates a new <see cref="IRenderTargetBitmapImpl"/> that can be used as a render layer

src/Avalonia.Visuals/Point.cs

@@ -267,5 +267,24 @@ namespace Avalonia
         {
             return new Point(_x, y);
         }
+
+        /// <summary>
+        /// Deconstructs the point into its X and Y coordinates.
+        /// </summary>
+        /// <param name="x">The X coordinate.</param>
+        /// <param name="y">The Y coordinate.</param>
+        public void Deconstruct(out double x, out double y)
+        {
+            x = this._x;
+            y = this._y;
+        }
+
+        /// <summary>
+        /// Gets a value indicating whether the X and Y coordinates are zero.
+        /// </summary>
+        public bool IsDefault
+        {
+            get { return (_x == 0) && (_y == 0); }
+        }
     }
 }

src/Avalonia.Visuals/Rendering/SceneGraph/DeferredDrawingContextImpl.cs

@@ -204,13 +204,13 @@ namespace Avalonia.Rendering.SceneGraph
         }
 
         /// <inheritdoc/>
-        public void DrawGlyphRun(IBrush foreground, GlyphRun glyphRun, Point baselineOrigin)
+        public void DrawGlyphRun(IBrush foreground, GlyphRun glyphRun)
         {
             var next = NextDrawAs<GlyphRunNode>();
 
             if (next == null || !next.Item.Equals(Transform, foreground, glyphRun))
             {
-                Add(new GlyphRunNode(Transform, foreground, glyphRun, baselineOrigin, CreateChildScene(foreground)));
+                Add(new GlyphRunNode(Transform, foreground, glyphRun, CreateChildScene(foreground)));
             }
 
             else

src/Avalonia.Visuals/Rendering/SceneGraph/GlyphRunNode.cs

@@ -1,6 +1,7 @@
 using System.Collections.Generic;
 
 using Avalonia.Media;
+using Avalonia.Media.Immutable;
 using Avalonia.Platform;
 using Avalonia.VisualTree;
 
@@ -17,20 +18,17 @@ namespace Avalonia.Rendering.SceneGraph
         /// <param name="transform">The transform.</param>
         /// <param name="foreground">The foreground brush.</param>
         /// <param name="glyphRun">The glyph run to draw.</param>
-        /// <param name="baselineOrigin">The baseline origin of the glyph run.</param>
         /// <param name="childScenes">Child scenes for drawing visual brushes.</param>
         public GlyphRunNode(
             Matrix transform,
             IBrush foreground,
             GlyphRun glyphRun,
-            Point baselineOrigin,
             IDictionary<IVisual, Scene> childScenes = null)
-            : base(glyphRun.Bounds.Translate(baselineOrigin), transform)
+            : base(new Rect(glyphRun.Size), transform)
         {
             Transform = transform;
             Foreground = foreground?.ToImmutable();
             GlyphRun = glyphRun;
-            BaselineOrigin = baselineOrigin;
             ChildScenes = childScenes;
         }
 
@@ -49,11 +47,6 @@ namespace Avalonia.Rendering.SceneGraph
         /// </summary>
         public GlyphRun GlyphRun { get; }
 
-        /// <summary>
-        /// Gets the baseline origin.
-        /// </summary>
-        public Point BaselineOrigin { get; set; }
-
         /// <inheritdoc/>
         public override IDictionary<IVisual, Scene> ChildScenes { get; }
 
@@ -61,7 +54,7 @@ namespace Avalonia.Rendering.SceneGraph
         public override void Render(IDrawingContextImpl context)
         {
             context.Transform = Transform;
-            context.DrawGlyphRun(Foreground, GlyphRun, BaselineOrigin);
+            context.DrawGlyphRun(Foreground, GlyphRun);
         }
 
         /// <summary>

src/Avalonia.Visuals/Size.cs

@@ -276,5 +276,24 @@ namespace Avalonia
         {
             return string.Format(CultureInfo.InvariantCulture, "{0}, {1}", _width, _height);
         }
+
+        /// <summary>
+        /// Deconstructs the size into its Width and Height values.
+        /// </summary>
+        /// <param name="width">The width.</param>
+        /// <param name="height">The height.</param>
+        public void Deconstruct(out double width, out double height)
+        {
+            width = this._width;
+            height = this._height;
+        }
+
+        /// <summary>
+        /// Gets a value indicating whether the Width and Height values are zero.
+        /// </summary>
+        public bool IsDefault
+        {
+            get { return (_width == 0) && (_height == 0); }
+        }
     }
 }

src/Avalonia.Visuals/Thickness.cs

@@ -272,5 +272,28 @@ namespace Avalonia
         {
             return $"{_left},{_top},{_right},{_bottom}";
         }
+
+        /// <summary>
+        /// Deconstructor the thickness into its left, top, right and bottom thickness values.
+        /// </summary>
+        /// <param name="left">The thickness on the left.</param>
+        /// <param name="top">The thickness on the top.</param>
+        /// <param name="right">The thickness on the right.</param>
+        /// <param name="bottom">The thickness on the bottom.</param>
+        public void Deconstruct(out double left, out double top, out double right, out double bottom)
+        {
+            left = this._left;
+            top = this._top;
+            right = this._right;
+            bottom = this._bottom;        
+        }
+
+        /// <summary>
+        /// Gets a value indicating whether the left, top, right and bottom thickness values are zero.
+        /// </summary>
+        public bool IsDefault
+        {
+            get { return (_left == 0) && (_top == 0) && (_right == 0) && (_bottom == 0); }
+        }
     }
 }

src/Avalonia.Visuals/Vector.cs

@@ -333,5 +333,24 @@ namespace Avalonia
         /// </summary>
         public static Vector UnitY
             => new Vector(0, 1);
+
+        /// <summary>
+        /// Deconstructs the vector into its X and Y components.
+        /// </summary>
+        /// <param name="x">The X component.</param>
+        /// <param name="y">The Y component.</param>
+        public void Deconstruct(out double x, out double y)
+        {
+            x = this._x;
+            y = this._y;
+        }
+
+        /// <summary>
+        /// Gets a value indicating whether the X and Y components are zero.
+        /// </summary>
+        public bool IsDefault
+        {
+            get { return (_x == 0) && (_y == 0); }
+        }
     }
 }

src/Skia/Avalonia.Skia/DrawingContextImpl.cs

@@ -401,16 +401,16 @@ namespace Avalonia.Skia
         }
 
         /// <inheritdoc />
-        public void DrawGlyphRun(IBrush foreground, GlyphRun glyphRun, Point baselineOrigin)
+        public void DrawGlyphRun(IBrush foreground, GlyphRun glyphRun)
         {
-            using (var paintWrapper = CreatePaint(_fillPaint, foreground, glyphRun.Bounds.Size))
+            using (var paintWrapper = CreatePaint(_fillPaint, foreground, glyphRun.Size))
             {
                 var glyphRunImpl = (GlyphRunImpl)glyphRun.GlyphRunImpl;
 
                 ConfigureTextRendering(paintWrapper);
 
-                Canvas.DrawText(glyphRunImpl.TextBlob, (float)baselineOrigin.X,
-                    (float)baselineOrigin.Y, paintWrapper.Paint);
+                Canvas.DrawText(glyphRunImpl.TextBlob, (float)glyphRun.BaselineOrigin.X,
+                    (float)glyphRun.BaselineOrigin.Y, paintWrapper.Paint);
             }
         }
 

src/Windows/Avalonia.Direct2D1/Media/DrawingContextImpl.cs

@@ -324,13 +324,14 @@ namespace Avalonia.Direct2D1.Media
         /// <param name="foreground">The foreground.</param>
         /// <param name="glyphRun">The glyph run.</param>
         /// <param name="baselineOrigin"></param>
-        public void DrawGlyphRun(IBrush foreground, GlyphRun glyphRun, Point baselineOrigin)
+        public void DrawGlyphRun(IBrush foreground, GlyphRun glyphRun)
         {
-            using (var brush = CreateBrush(foreground, glyphRun.Bounds.Size))
+            using (var brush = CreateBrush(foreground, glyphRun.Size))
             {
                 var glyphRunImpl = (GlyphRunImpl)glyphRun.GlyphRunImpl;
 
-                _renderTarget.DrawGlyphRun(baselineOrigin.ToSharpDX(), glyphRunImpl.GlyphRun, brush.PlatformBrush, MeasuringMode.Natural);
+                _renderTarget.DrawGlyphRun(glyphRun.BaselineOrigin.ToSharpDX(), glyphRunImpl.GlyphRun,
+                    brush.PlatformBrush, MeasuringMode.Natural);
             }
         }
 

tests/Avalonia.Base.UnitTests/Data/Core/Plugins/DataAnnotationsValidationPluginTests.cs

@@ -59,12 +59,12 @@ namespace Avalonia.Markup.UnitTests.Data.Plugins
             {
                 new BindingNotification(5),
                 new BindingNotification(
-                    new ValidationException(errmsg),
+                    new DataValidationException(errmsg),
                     BindingErrorType.DataValidationError,
                     3),
                 new BindingNotification(7),
                 new BindingNotification(
-                    new ValidationException(errmsg),
+                    new DataValidationException(errmsg),
                     BindingErrorType.DataValidationError,
                     11),
             }, result);

tests/Avalonia.Controls.UnitTests/ComboBoxTests.cs

@@ -2,7 +2,6 @@ using Avalonia.Controls.Presenters;
 using Avalonia.Controls.Primitives;
 using Avalonia.Controls.Shapes;
 using Avalonia.Controls.Templates;
-using Avalonia.Input;
 using Avalonia.LogicalTree;
 using Avalonia.Media;
 using Avalonia.UnitTests;
@@ -27,6 +26,7 @@ namespace Avalonia.Controls.UnitTests
             Assert.True(target.IsDropDownOpen);
 
             _helper.Down(target);
+            _helper.Up(target);
 
             Assert.False(target.IsDropDownOpen);
         }

tests/Avalonia.Controls.UnitTests/Generators/ItemContainerGeneratorTests.cs

@@ -144,6 +144,16 @@ namespace Avalonia.Controls.UnitTests.Generators
             Assert.Equal("bar", container.Content);
         }
 
+        [Fact]
+        public void Materialize_Should_Create_Containers_When_Item_Is_Null()
+        {
+            var owner = new Decorator();
+            var target = new ItemContainerGenerator<ListBoxItem>(owner, ListBoxItem.ContentProperty, null);
+            var container = (ListBoxItem)target.Materialize(0, null).ContainerControl;
+
+            Assert.True(container != null, "The containers is not materialized.");
+        }
+
         private IList<ItemContainerInfo> Materialize(
             IItemContainerGenerator generator,
             int index,

tests/Avalonia.Controls.UnitTests/Primitives/PopupTests.cs

@@ -21,7 +21,50 @@ namespace Avalonia.Controls.UnitTests.Primitives
     public class PopupTests
     {
         protected bool UsePopupHost;
-        
+
+        [Fact]
+        public void Popup_Open_Without_Target_Should_Attach_Itself_Later()
+        {
+            using (CreateServices())
+            {
+                int openedEvent = 0;
+                var target = new Popup();
+                target.Opened += (s, a) => openedEvent++;
+                target.IsOpen = true;
+
+                var window = PreparedWindow(target);
+                window.Show();
+                Assert.Equal(1, openedEvent);
+            }
+        }
+
+        [Fact]
+        public void Popup_Without_TopLevel_Shouldnt_Call_Open()
+        {
+            int openedEvent = 0;
+            var target = new Popup();
+            target.Opened += (s, a) => openedEvent++;
+            target.IsOpen = true;
+
+            Assert.Equal(0, openedEvent);
+        }
+
+        [Fact]
+        public void Opening_Popup_Shouldnt_Throw_When_Not_In_Visual_Tree()
+        {
+            var target = new Popup();
+            target.IsOpen = true;
+        }
+
+        [Fact]
+        public void Opening_Popup_Shouldnt_Throw_When_In_Tree_Without_TopLevel()
+        {
+            Control c = new Control();
+            var target = new Popup();
+            ((ISetLogicalParent)target).SetParent(c);
+            target.IsOpen = true;
+        }
+
         [Fact]
         public void Setting_Child_Should_Set_Child_Controls_LogicalParent()
         {

tests/Avalonia.Skia.UnitTests/Media/TextFormatting/TextLayoutTests.cs

@@ -369,7 +369,7 @@ namespace Avalonia.Skia.UnitTests.Media.TextFormatting
 
                 var glyphRun = shapedRun.GlyphRun;
 
-                var width = glyphRun.Bounds.Width;
+                var width = glyphRun.Size.Width;
 
                 var characterHit = glyphRun.GetCharacterHitFromDistance(width, out _);
 

tests/Avalonia.Visuals.UnitTests/Media/GlyphRunTests.cs

@@ -119,6 +119,56 @@ namespace Avalonia.Visuals.UnitTests.Media
             }
         }
 
+        [InlineData(new double[] { 10, 10, 10 }, new ushort[] { 0, 0, 0 }, 0)]
+        [InlineData(new double[] { 10, 10, 10 }, new ushort[] { 0, 0, 0 }, 1)]
+        [InlineData(new double[] { 10, 10, 10, 10 }, new ushort[] { 0, 0, 0, 3 }, 0)]
+        [InlineData(new double[] { 10, 10, 10, 10 }, new ushort[] { 3, 0, 0, 0 }, 1)]
+        [InlineData(new double[] { 10, 10, 10, 10, 10 }, new ushort[] { 0, 1, 1, 1, 4 }, 0)]
+        [InlineData(new double[] { 10, 10, 10, 10, 10 }, new ushort[] { 4, 1, 1, 1, 0 }, 1)]
+        [Theory]
+        public void Should_Find_Glyph_Index(double[] advances, ushort[] clusters, int bidiLevel)
+        {
+            using (var glyphRun = CreateGlyphRun(advances, clusters, bidiLevel))
+            {
+                if (glyphRun.IsLeftToRight)
+                {
+                    for (var i = 0; i < clusters.Length; i++)
+                    {
+                        var cluster = clusters[i];
+
+                        var found = glyphRun.FindGlyphIndex(cluster);
+
+                        var expected = i;
+
+                        while (expected - 1 >= 0 && clusters[expected - 1] == cluster)
+                        {
+                            expected--;
+                        }
+
+                        Assert.Equal(expected, found);
+                    }
+                }
+                else
+                {
+                    for (var i = clusters.Length - 1; i > 0; i--)
+                    {
+                        var cluster = clusters[i];
+
+                        var found = glyphRun.FindGlyphIndex(cluster);
+
+                        var expected = i;
+
+                        while (expected + 1 < clusters.Length && clusters[expected + 1] == cluster)
+                        {
+                            expected++;
+                        }
+
+                        Assert.Equal(expected, found);
+                    }
+                }
+            }
+        }
+
         private static GlyphRun CreateGlyphRun(double[] glyphAdvances, ushort[] glyphClusters, int bidiLevel = 0)
         {
             var count = glyphAdvances.Length;