enhance: only show syntax-highlighting toggle if current revision content is a text file

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

Author: love-linger

src/Converters/ObjectConverters.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Globalization;
+using Avalonia.Data.Converters;
+
+namespace SourceGit.Converters
+{
+    public static class ObjectConverters
+    {
+        public class IsTypeOfConverter : IValueConverter
+        {
+            public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+            {
+                if (value == null || parameter == null)
+                    return false;
+
+                return value.GetType().IsAssignableTo((Type)parameter);
+            }
+
+            public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+            {
+                return new NotImplementedException();
+            }
+        }
+
+        public static readonly IsTypeOfConverter IsTypeOf = new IsTypeOfConverter();
+    }
+}

src/Views/FileHistories.axaml

@@ -139,14 +139,28 @@
                         <Border Grid.Row="0"
                                 BorderThickness="0,0,0,1" BorderBrush="{DynamicResource Brush.Border2}"
                                 Background="{DynamicResource Brush.Window}">
-                          <Grid ColumnDefinitions="Auto,*">
+                          <Grid ColumnDefinitions="Auto,*,Auto">
                             <Path Grid.Column="0" Width="12" Height="12" Data="{StaticResource Icons.File}" Margin="8,0,0,0"/>
                             <TextBlock Grid.Column="1"
                                        Classes="primary"
                                        Margin="4,0,0,0"
                                        Text="{Binding Path}"
                                        FontSize="11"
                                        TextTrimming="CharacterEllipsis"/>
+                            <ToggleButton Grid.Column="2"
+                                          Classes="line_path"
+                                          Width="28"
+                                          Background="Transparent"
+                                          IsChecked="{Binding Source={x:Static vm:Preferences.Instance}, Path=UseSyntaxHighlighting, Mode=TwoWay}"
+                                          ToolTip.Tip="{DynamicResource Text.Diff.SyntaxHighlight}">
+                              <ToggleButton.IsVisible>
+                                <Binding Path="Content"
+                                         Mode="OneWay"
+                                         Converter="{x:Static c:ObjectConverters.IsTypeOf}"
+                                         ConverterParameter="{x:Type m:RevisionTextFile}"/>
+                              </ToggleButton.IsVisible>
+                              <Path Width="13" Height="13" Data="{StaticResource Icons.SyntaxHighlight}" Margin="0,3,0,0"/>
+                            </ToggleButton>
                           </Grid>
                         </Border>
 

src/Views/RevisionFiles.axaml

@@ -2,6 +2,7 @@
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:m="using:SourceGit.Models"
              xmlns:vm="using:SourceGit.ViewModels"
              xmlns:v="using:SourceGit.Views"
              xmlns:c="using:SourceGit.Converters"
@@ -133,6 +134,12 @@
                             Background="Transparent"
                             IsChecked="{Binding Source={x:Static vm:Preferences.Instance}, Path=UseSyntaxHighlighting, Mode=TwoWay}"
                             ToolTip.Tip="{DynamicResource Text.Diff.SyntaxHighlight}">
+                <ToggleButton.IsVisible>
+                  <Binding Path="ViewRevisionFileContent"
+                           Mode="OneWay"
+                           Converter="{x:Static c:ObjectConverters.IsTypeOf}"
+                           ConverterParameter="{x:Type m:RevisionTextFile}"/>
+                </ToggleButton.IsVisible>
                 <Path Width="13" Height="13" Data="{StaticResource Icons.SyntaxHighlight}" Margin="0,3,0,0"/>
               </ToggleButton>
             </Grid>