Add support for document window drag events

wieslawsoltes · Jul 25, 2021 · 3b027ae · 3b027ae
1 parent 3b40c50
commit 3b027ae
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Showing 6 changed files with 128 additions and 16 deletions.
diff --git a/src/Dock.Avalonia/Controls/HostWindow.axaml b/src/Dock.Avalonia/Controls/HostWindow.axaml
@@ -26,7 +26,7 @@
           <Panel Background="Transparent" Margin="{TemplateBinding WindowDecorationMargin}" />
           <VisualLayerManager>
             <VisualLayerManager.ChromeOverlayLayer>
-              <TitleBar />
+              <idc:HostWindowTitleBar Name="PART_TitleBar" />
             </VisualLayerManager.ChromeOverlayLayer>
             <ContentPresenter Name="PART_ContentPresenter"
                               ContentTemplate="{TemplateBinding ContentTemplate}"
@@ -94,4 +94,7 @@
     <Setter Property="TransparencyLevelHint" Value="Transparent"/>
     <Setter Property="Opacity" Value="0.5" />
   </Style>
+  <Style Selector="idc|HostWindowTitleBar /template/ Border#PART_Background">
+    <Setter Property="IsHitTestVisible" Value="True" />
+  </Style>
 </Styles>
diff --git a/src/Dock.Avalonia/Controls/HostWindow.axaml.cs b/src/Dock.Avalonia/Controls/HostWindow.axaml.cs
@@ -3,7 +3,9 @@
 using System.Reactive.Linq;
 using Avalonia;
 using Avalonia.Controls;
+using Avalonia.Controls.Chrome;
 using Avalonia.Controls.Metadata;
+using Avalonia.Controls.Primitives;
 using Avalonia.Input;
 using Avalonia.Styling;
 using Dock.Avalonia.Internal;
@@ -15,12 +17,13 @@ namespace Dock.Avalonia.Controls
     /// <summary>
     /// Interaction logic for <see cref="HostWindow"/> xaml.
     /// </summary>
-    [PseudoClasses(":toolwindow")]
+    [PseudoClasses(":toolwindow", ":dragging")]
     public class HostWindow : Window, IStyleable, IHostWindow
     {
         private readonly DockManager _dockManager;
         private readonly HostWindowState _hostWindowState;
         private Control? _chromeGrip;
+        private HostWindowTitleBar? _hostWindowTitleBar;
         private bool _mouseDown;
 
         /// <summary>
@@ -68,6 +71,45 @@ public HostWindow()
             UpdatePseudoClasses(IsToolWindow);
         }
 
+        /// <inheritdoc/>
+        protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
+        {
+            base.OnApplyTemplate(e);
+
+            _hostWindowTitleBar = e.NameScope.Find<HostWindowTitleBar>("PART_TitleBar");
+            if (_hostWindowTitleBar is { })
+            {
+                _hostWindowTitleBar.ApplyTemplate();
+
+                if (_hostWindowTitleBar.BackgroundControl is { })
+                {
+                    _hostWindowTitleBar.BackgroundControl.PointerPressed += (_, args) =>
+                    {
+                        MoveDrag(args);
+                    };
+                }
+            }
+        }
+
+        private void MoveDrag(PointerPressedEventArgs e)
+        {
+            if (Window?.Factory?.OnWindowMoveDragBegin(Window) != true)
+            {
+                return;
+            }
+
+            _mouseDown = true;
+            _hostWindowState.Process(e.GetPosition(this), EventType.Pressed);
+
+            PseudoClasses.Set(":dragging", true);
+            BeginMoveDrag(e);
+            PseudoClasses.Set(":dragging", false);
+
+            Window?.Factory?.OnWindowMoveDragEnd(Window);
+            _hostWindowState.Process(e.GetPosition(this), EventType.Released);
+            _mouseDown = false;
+        }
+
         /// <inheritdoc/>
         protected override void OnPointerPressed(PointerPressedEventArgs e)
         {
@@ -77,19 +119,7 @@ protected override void OnPointerPressed(PointerPressedEventArgs e)
             {
                 if (e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
                 {
-                    if (Window?.Factory?.OnWindowMoveDragBegin(Window) == true)
-                    {
-                        _mouseDown = true;
-                        _hostWindowState.Process(e.GetPosition(this), EventType.Pressed);
-
-                        PseudoClasses.Set(":dragging", true);
-                        BeginMoveDrag(e);
-                        PseudoClasses.Set(":dragging", false);
-
-                        Window?.Factory?.OnWindowMoveDragEnd(Window);
-                        _hostWindowState.Process(e.GetPosition(this), EventType.Released);
-                        _mouseDown = false;
-                    }
+                    MoveDrag(e);
                 }
             }
         }
@@ -100,7 +130,9 @@ private void HostWindow_PositionChanged(object? sender, PixelPointEventArgs e)
             {
                 Window.Save();
 
-                if (_chromeGrip is { } && _chromeGrip.IsPointerOver && _mouseDown)
+                if ((_chromeGrip is { } && _chromeGrip.IsPointerOver)
+                    || (_hostWindowTitleBar?.BackgroundControl is { } && (_hostWindowTitleBar?.BackgroundControl?.IsPointerOver ?? false))
+                    && _mouseDown)
                 {
                     Window.Factory?.OnWindowMoveDrag(Window);
                     _hostWindowState.Process(Position.ToPoint(1.0), EventType.Moved);

diff --git a/src/Dock.Avalonia/Controls/HostWindowTitleBar.axaml b/src/Dock.Avalonia/Controls/HostWindowTitleBar.axaml
@@ -0,0 +1,49 @@
+<Styles xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:idc="using:Dock.Avalonia.Controls">
+  <Design.PreviewWith>
+    <Border>
+      <idc:HostWindowTitleBar Background="SkyBlue" Height="30" Width="300" Foreground="Black" />
+    </Border>
+  </Design.PreviewWith>
+  <Style Selector="idc|HostWindowTitleBar">
+    <Setter Property="Foreground" Value="{DynamicResource SystemControlForegroundBaseHighBrush}"/>    
+    <Setter Property="VerticalAlignment" Value="Top" />
+    <Setter Property="HorizontalAlignment" Value="Stretch" />
+    <Setter Property="Background" Value="Transparent" />
+    <Setter Property="Template">
+      <ControlTemplate>
+        <Panel HorizontalAlignment="{TemplateBinding HorizontalAlignment}" VerticalAlignment="Stretch">
+          <Panel x:Name="PART_MouseTracker" Height="1" VerticalAlignment="Top" />
+          <Panel x:Name="PART_Container">
+            <Border x:Name="PART_Background" Background="{TemplateBinding Background}" />
+            <CaptionButtons x:Name="PART_CaptionButtons" VerticalAlignment="Top" HorizontalAlignment="Right" Foreground="{TemplateBinding Foreground}" />
+          </Panel>
+        </Panel>
+      </ControlTemplate>
+    </Setter>
+  </Style>
+  <Style Selector="idc|HostWindowTitleBar:fullscreen">
+    <Setter Property="Background" Value="{DynamicResource SystemAccentColor}" />
+  </Style>
+  <Style Selector="idc|HostWindowTitleBar /template/ Border#PART_Background">
+    <Setter Property="IsHitTestVisible" Value="False" />
+  </Style>
+  <Style Selector="idc|HostWindowTitleBar:fullscreen /template/ Border#PART_Background">
+    <Setter Property="IsHitTestVisible" Value="True" />
+  </Style>
+  <Style Selector="idc|HostWindowTitleBar:fullscreen /template/ Panel#PART_MouseTracker">
+    <Setter Property="Background" Value="Transparent" />
+  </Style>
+  <Style Selector="idc|HostWindowTitleBar:fullscreen /template/ Panel#PART_Container">
+    <Setter Property="RenderTransform" Value="translateY(-30px)" />
+    <Setter Property="Transitions">
+      <Transitions>
+        <TransformOperationsTransition Property="RenderTransform" Duration="0:0:.25" />
+      </Transitions>
+    </Setter>
+  </Style>
+  <Style Selector="idc|HostWindowTitleBar:fullscreen:pointerover /template/ Panel#PART_Container">
+    <Setter Property="RenderTransform" Value="none" />
+  </Style>
+</Styles>
diff --git a/src/Dock.Avalonia/Controls/HostWindowTitleBar.axaml.cs b/src/Dock.Avalonia/Controls/HostWindowTitleBar.axaml.cs
@@ -0,0 +1,26 @@
+using System;
+using Avalonia.Controls;
+using Avalonia.Controls.Chrome;
+using Avalonia.Controls.Primitives;
+using Avalonia.Styling;
+
+namespace Dock.Avalonia.Controls
+{
+    /// <summary>
+    /// Interaction logic for <see cref="HostWindowTitleBar"/> xaml.
+    /// </summary>
+    public class HostWindowTitleBar : TitleBar, IStyleable
+    {
+        internal Control? BackgroundControl { get; private set; }
+
+        Type IStyleable.StyleKey => typeof(HostWindowTitleBar);
+
+        /// <inheritdoc/>
+        protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
+        {
+            base.OnApplyTemplate(e);
+
+            BackgroundControl = e.NameScope.Find<Control>("PART_Background");
+        }
+    }
+}
diff --git a/src/Dock.Avalonia/Themes/DefaultTheme.axaml b/src/Dock.Avalonia/Themes/DefaultTheme.axaml
@@ -10,6 +10,7 @@
   <StyleInclude Source="avares://Dock.Avalonia/Controls/ToolControl.axaml" />
   <StyleInclude Source="avares://Dock.Avalonia/Controls/ToolPinnedControl.axaml" />
   <StyleInclude Source="avares://Dock.Avalonia/Controls/DockControl.axaml" />
+  <StyleInclude Source="avares://Dock.Avalonia/Controls/HostWindowTitleBar.axaml" />
   <StyleInclude Source="avares://Dock.Avalonia/Controls/HostWindow.axaml" />
   <Style>
     <Style.Resources>

diff --git a/src/Dock.Avalonia/Themes/FluentTheme.axaml b/src/Dock.Avalonia/Themes/FluentTheme.axaml
@@ -10,6 +10,7 @@
   <StyleInclude Source="avares://Dock.Avalonia/Controls/ToolControl.axaml" />
   <StyleInclude Source="avares://Dock.Avalonia/Controls/ToolPinnedControl.axaml" />
   <StyleInclude Source="avares://Dock.Avalonia/Controls/DockControl.axaml" />
+  <StyleInclude Source="avares://Dock.Avalonia/Controls/HostWindowTitleBar.axaml" />
   <StyleInclude Source="avares://Dock.Avalonia/Controls/HostWindow.axaml" />
   <Style>
     <Style.Resources>