更新

WPFDark/Controls/BiaEditableTextBlock.xaml

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+<ResourceDictionary x:Class="WPFDark.Controls.BiaEditableTextBlockEventHandler"
+                    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                    xmlns:controls="clr-namespace:WPFDark.Controls"
+                    xmlns:internals="clr-namespace:WPFDark.Internals"
+                    xmlns:wpf="clr-namespace:WPFDark">
+    <ResourceDictionary.MergedDictionaries>
+        <internals:SharedResourceDictionary Source="pack://application:,,,/WPFDark;component/Controls/BiaTextBlock.xaml" />
+        <internals:SharedResourceDictionary Source="pack://application:,,,/WPFDark;component/StandardControls/TextBox.xaml" />
+    </ResourceDictionary.MergedDictionaries>
+
+    <Style x:Key="TextBoxStyle"
+           BasedOn="{StaticResource {x:Type TextBox}}"
+           TargetType="{x:Type TextBox}">
+        <EventSetter Event="Loaded" Handler="TextBox_Loaded" />
+        <EventSetter Event="LostFocus" Handler="TextBox_LostFocus" />
+        <EventSetter Event="PreviewKeyDown" Handler="TextBox_PreviewKeyDown" />
+        <EventSetter Event="PreviewMouseDown" Handler="TextBox_PreviewMouseDown" />
+
+        <Setter Property="Foreground" Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type controls:BiaEditableTextBlock}}, Mode=OneWay, Path=Foreground}" />
+        <Setter Property="Text" Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type controls:BiaEditableTextBlock}}, Mode=TwoWay, Path=Text}" />
+    </Style>
+
+    <Style x:Key="TextBlockStyle"
+           BasedOn="{StaticResource {x:Type controls:BiaTextBlock}}"
+           TargetType="{x:Type controls:BiaTextBlock}">
+        <EventSetter Event="MouseDown" Handler="TextBlock_OnMouseDown" />
+
+        <Setter Property="IsHitTestVisible" Value="True" />
+
+        <Setter Property="Foreground" Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type controls:BiaEditableTextBlock}}, Mode=OneWay, Path=Foreground}" />
+        <Setter Property="Text" Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type controls:BiaEditableTextBlock}}, Mode=OneWay, Path=Text}" />
+
+        <Style.Triggers>
+            <DataTrigger Binding="{Binding RelativeSource={RelativeSource AncestorType={x:Type controls:BiaEditableTextBlock}}, Mode=OneWay, Path=Text}" Value="{x:Null}">
+                <Setter Property="Foreground" Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type controls:BiaEditableTextBlock}}, Mode=OneWay, Path=WatermarkForeground}" />
+                <Setter Property="Text" Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type controls:BiaEditableTextBlock}}, Mode=OneWay, Path=Watermark}" />
+            </DataTrigger>
+
+            <DataTrigger Binding="{Binding RelativeSource={RelativeSource AncestorType={x:Type controls:BiaEditableTextBlock}}, Mode=OneWay, Path=Text}" Value="">
+                <Setter Property="Foreground" Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type controls:BiaEditableTextBlock}}, Mode=OneWay, Path=WatermarkForeground}" />
+                <Setter Property="Text" Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type controls:BiaEditableTextBlock}}, Mode=OneWay, Path=Watermark}" />
+            </DataTrigger>
+        </Style.Triggers>
+    </Style>
+
+    <Style TargetType="{x:Type controls:BiaEditableTextBlock}">
+        <Setter Property="Foreground" Value="{DynamicResource ForegroundBrushKey}" />
+        <Setter Property="WatermarkForeground" Value="{DynamicResource TextBoxSubForegroundBrushKey}" />
+        <Setter Property="Margin" Value="0" />
+        <Setter Property="Cursor" Value="Hand" />
+
+        <Style.Triggers>
+            <Trigger Property="IsEditing" Value="True">
+                <Setter Property="Template">
+                    <Setter.Value>
+                        <ControlTemplate>
+                            <TextBox Style="{StaticResource TextBoxStyle}" />
+                        </ControlTemplate>
+                    </Setter.Value>
+                </Setter>
+            </Trigger>
+
+            <Trigger Property="IsEditing" Value="False">
+                <Setter Property="Template">
+                    <Setter.Value>
+                        <ControlTemplate>
+                            <controls:BiaTextBlock Style="{StaticResource TextBlockStyle}" />
+                        </ControlTemplate>
+                    </Setter.Value>
+                </Setter>
+            </Trigger>
+        </Style.Triggers>
+    </Style>
+</ResourceDictionary>