feature: allows to go back to repository command palette from sub command

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

src/Views/BlameCommandPalette.axaml

@@ -9,16 +9,15 @@
              x:Class="SourceGit.Views.BlameCommandPalette"
              x:DataType="vm:BlameCommandPalette">
   <Grid RowDefinitions="Auto,Auto">
-    <TextBox Grid.Row="0"
-             x:Name="FilterTextBox"
-             Height="24"
-             Margin="4,8,4,0"
-             BorderThickness="1"
-             CornerRadius="12"
-             Text="{Binding Filter, Mode=TwoWay}"
-             BorderBrush="{DynamicResource Brush.Border2}"
-             VerticalContentAlignment="Center"
-             v:AutoFocusBehaviour.IsEnabled="True">
+    <v:RepositoryCommandPaletteTextBox Grid.Row="0"
+                                       x:Name="FilterTextBox"
+                                       Height="24"
+                                       Margin="4,8,4,0"
+                                       BorderThickness="1"
+                                       CornerRadius="12"
+                                       Text="{Binding Filter, Mode=TwoWay}"
+                                       BorderBrush="{DynamicResource Brush.Border2}"
+                                       VerticalContentAlignment="Center">
       <TextBox.InnerLeftContent>
         <StackPanel Orientation="Horizontal">
           <Path Width="14" Height="14"
@@ -29,7 +28,7 @@
                   Background="{DynamicResource Brush.Badge}"
                   Height="18"
                   CornerRadius="4"
-                  Margin="4,0" Padding="4,0">
+                  Margin="4,0,0,0" Padding="4,0">
             <TextBlock Text="{DynamicResource Text.Blame}"
                        Foreground="Black"
                        FontWeight="Bold"/>
@@ -50,7 +49,7 @@
                 Data="{StaticResource Icons.Clear}"/>
         </Button>
       </TextBox.InnerRightContent>
-    </TextBox>
+    </v:RepositoryCommandPaletteTextBox>
 
     <ListBox Grid.Row="1"
              x:Name="FileListBox"

src/Views/FileHistoryCommandPalette.axaml

@@ -9,16 +9,15 @@
              x:Class="SourceGit.Views.FileHistoryCommandPalette"
              x:DataType="vm:FileHistoryCommandPalette">
   <Grid RowDefinitions="Auto,Auto">
-    <TextBox Grid.Row="0"
-             x:Name="FilterTextBox"
-             Height="24"
-             Margin="4,8,4,0"
-             BorderThickness="1"
-             CornerRadius="12"
-             Text="{Binding Filter, Mode=TwoWay}"
-             BorderBrush="{DynamicResource Brush.Border2}"
-             VerticalContentAlignment="Center"
-             v:AutoFocusBehaviour.IsEnabled="True">
+    <v:RepositoryCommandPaletteTextBox Grid.Row="0"
+                                       x:Name="FilterTextBox"
+                                       Height="24"
+                                       Margin="4,8,4,0"
+                                       BorderThickness="1"
+                                       CornerRadius="12"
+                                       Text="{Binding Filter, Mode=TwoWay}"
+                                       BorderBrush="{DynamicResource Brush.Border2}"
+                                       VerticalContentAlignment="Center">
       <TextBox.InnerLeftContent>
         <StackPanel Orientation="Horizontal">
           <Path Width="14" Height="14"
@@ -29,7 +28,7 @@
                   Background="{DynamicResource Brush.Badge}"
                   Height="18"
                   CornerRadius="4"
-                  Margin="4,0" Padding="4,0">
+                  Margin="4,0,0,0" Padding="4,0">
             <TextBlock Text="{DynamicResource Text.FileHistory}"
                        Foreground="Black"
                        FontWeight="Bold"/>
@@ -50,7 +49,7 @@
                 Data="{StaticResource Icons.Clear}"/>
         </Button>
       </TextBox.InnerRightContent>
-    </TextBox>
+    </v:RepositoryCommandPaletteTextBox>
 
     <ListBox Grid.Row="1"
              x:Name="FileListBox"

src/Views/MergeCommandPalette.axaml

@@ -10,16 +10,15 @@
              x:Class="SourceGit.Views.MergeCommandPalette"
              x:DataType="vm:MergeCommandPalette">
   <Grid RowDefinitions="Auto,Auto">
-    <TextBox Grid.Row="0"
-             x:Name="FilterTextBox"
-             Height="24"
-             Margin="4,8,4,0"
-             BorderThickness="1"
-             CornerRadius="12"
-             Text="{Binding Filter, Mode=TwoWay}"
-             BorderBrush="{DynamicResource Brush.Border2}"
-             VerticalContentAlignment="Center"
-             v:AutoFocusBehaviour.IsEnabled="True">
+    <v:RepositoryCommandPaletteTextBox Grid.Row="0"
+                                       x:Name="FilterTextBox"
+                                       Height="24"
+                                       Margin="4,8,4,0"
+                                       BorderThickness="1"
+                                       CornerRadius="12"
+                                       Text="{Binding Filter, Mode=TwoWay}"
+                                       BorderBrush="{DynamicResource Brush.Border2}"
+                                       VerticalContentAlignment="Center">
       <TextBox.InnerLeftContent>
         <StackPanel Orientation="Horizontal">
           <Path Width="14" Height="14"
@@ -30,7 +29,7 @@
                   Background="{DynamicResource Brush.Badge}"
                   Height="18"
                   CornerRadius="4"
-                  Margin="4,0" Padding="4,0">
+                  Margin="4,0,0,0" Padding="4,0">
             <TextBlock Text="{DynamicResource Text.Merge}"
                        Foreground="Black"
                        FontWeight="Bold"/>
@@ -51,7 +50,7 @@
                 Data="{StaticResource Icons.Clear}"/>
         </Button>
       </TextBox.InnerRightContent>
-    </TextBox>
+    </v:RepositoryCommandPaletteTextBox>
 
     <ListBox Grid.Row="1"
              x:Name="BranchListBox"

src/Views/RepositoryCommandPaletteTextBox.cs

@@ -0,0 +1,36 @@
+using System;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Input;
+using Avalonia.VisualTree;
+
+namespace SourceGit.Views
+{
+    public class RepositoryCommandPaletteTextBox : TextBox
+    {
+        protected override Type StyleKeyOverride => typeof(TextBox);
+
+        protected override void OnKeyDown(KeyEventArgs e)
+        {
+            if (e.Key == Key.Back && string.IsNullOrEmpty(Text))
+            {
+                var launcherView = this.FindAncestorOfType<Launcher>(false);
+                if (launcherView is { DataContext: ViewModels.Launcher launcher } &&
+                    launcher.ActivePage is { Data: ViewModels.Repository repo })
+                {
+                    launcher.OpenCommandPalette(new ViewModels.RepositoryCommandPalette(launcher, repo));
+                    e.Handled = true;
+                    return;
+                }
+            }
+
+            base.OnKeyDown(e);
+        }
+
+        protected override void OnAttachedToVisualTree(VisualTreeAttachmentEventArgs e)
+        {
+            base.OnAttachedToVisualTree(e);
+            Focus();
+        }
+    }
+}