[WPF] 可選擇的TextBlock，正則匹配高亮顯示

　　實現TextBlock控制元件像TextBox一樣支援選擇文字，又保留TextBlock顯示省略號等特性，找不到參考文獻了，抱歉。

　　下面演示基於可選擇TextBlock實現的效果：

程式碼已上傳至https://gitee.com/Pumbaa_Peng/textbook-demo.git。

<pp:ChromeWindow x:Class="TextBlockDemo.MainWindow"
                 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                 xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
                 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
                 xmlns:pp="https://www.cnblogs.com/pumbaa"
                 xmlns:behaviors="clr-namespace:TextBlockDemo.Behaviors"
                 xmlns:attach="clr-namespace:TextBlockDemo.Controls.Attach"
                 xmlns:i="http://schemas.microsoft.com/xaml/behaviors"
                 mc:Ignorable="d"
                 Title="MainWindow" Height="720" Width="1024"
                 UseLayoutRounding="True" SnapsToDevicePixels="True"
                 Background="{DynamicResource PP.Brushes.Background}" Foreground="{DynamicResource PP.Brushes.Foreground}" FontSize="16" TextBlock.LineHeight="24">
    <pp:ScrollViewerEx HorizontalScrollBarVisibility="Disabled">
        <StackPanel Margin="18">
            <TextBlock FontSize="18" LineHeight="36">示例一</TextBlock>
            <TextBlock Style="{StaticResource App.Styles.TextBlock.Selectable}" Foreground="{DynamicResource PP.Brushes.Warning.Highlight}">這是普通的可選TextBlock</TextBlock>
            <Line X2="1" Stretch="Uniform" Stroke="#999" Margin="0 18"></Line>
            <TextBlock FontSize="18" LineHeight="36">示例二</TextBlock>
            <TextBlock Foreground="{DynamicResource PP.Brushes.Warning.Highlight}" LineHeight="24">可選擇文字超出時顯示省略號，選擇時隱藏省略號</TextBlock>
            <DockPanel Margin="0 12">
                <TextBlock Foreground="#666" VerticalAlignment="Center">繫結文字：</TextBlock>
                <TextBox x:Name="input" MinWidth="400" TextWrapping="Wrap" VerticalContentAlignment="Top" Text="在WPF（Windows Presentation Foundation）中，文字修整是一種常用的技術，用於處理文字內容超出其顯示區域時的情況。透過設定TextBlock的TextTrimming屬性，可以指定當文字超出其容器邊界時應如何顯示。這個屬性接受TextTrimming列舉的值，這些值決定了文字的修整行為。" />
            </DockPanel>
            <TextBox Style="{StaticResource App.Styles.TextBox.SelectableTextBlock}" MaxWidth="400" HorizontalAlignment="Left" Text="{Binding Text,ElementName=input}" />
            <Line X2="1" Stretch="Uniform" Stroke="#999" Margin="0 18"></Line>
            <TextBlock FontSize="18" LineHeight="36">示例三</TextBlock>
            <TextBlock Foreground="{DynamicResource PP.Brushes.Warning.Highlight}" LineHeight="24">多行可選擇文字超出時顯示省略號，選擇時隱藏省略號</TextBlock>
            <DockPanel Margin="0 12">
                <TextBlock Foreground="#666" VerticalAlignment="Center">行數：</TextBlock>
                <Slider x:Name="slider" Minimum="1" Maximum="10" Value="3" SmallChange="1" Width="400" HorizontalAlignment="Left"
                        TickFrequency="1" TickPlacement="BottomRight" IsSnapToTickEnabled="True" />
            </DockPanel>
            <TextBox Style="{StaticResource App.Styles.TextBox.SelectableTextBlock.MaxLines}" MaxLines="{Binding Value,ElementName=slider}" MaxWidth="400" HorizontalAlignment="Left" Text="{Binding Text,ElementName=input}" />
            <Line X2="1" Stretch="Uniform" Stroke="#999" Margin="0 18"></Line>
            <TextBlock FontSize="18" LineHeight="36">示例四</TextBlock>
            <TextBlock Foreground="{DynamicResource PP.Brushes.Warning.Highlight}" LineHeight="24">多行可選擇文字超出時顯示省略號，選擇時隱藏展開</TextBlock>
            <TextBox Style="{StaticResource App.Styles.TextBox.SelectableTextBlock.AutoExpand}" MaxLines="{Binding Value,ElementName=slider}" Margin="0 12 0 0" MaxWidth="400" HorizontalAlignment="Left" Text="{Binding Text,ElementName=input}" />
            <Line X2="1" Stretch="Uniform" Stroke="#999" Margin="0 18"></Line>
            <TextBlock FontSize="18" LineHeight="36">示例五</TextBlock>
            <TextBlock Foreground="{DynamicResource PP.Brushes.Warning.Highlight}" LineHeight="24">文字正則高亮顯示（可以多個正則，每個正則不同顏色）</TextBlock>
            <TextBlock Margin="0 12 0 0" Style="{StaticResource App.Styles.TextBlock.Selectable}" TextWrapping="Wrap" attach:TextElement.Placeholder="{Binding Text,ElementName=input}">
                <i:Interaction.Behaviors>
                    <behaviors:TextHighlightBehavior>
                        <behaviors:TextHighlightBehavior.HighlightRules>
                            <behaviors:HighlightRule Regex="[a-zA-Z]+" Brush="#F5201B" />
                            <behaviors:HighlightRule Regex="文字|技術" Brush="#F69A18" />
                        </behaviors:TextHighlightBehavior.HighlightRules>
                    </behaviors:TextHighlightBehavior>
                </i:Interaction.Behaviors>
            </TextBlock>
            <Line X2="1" Stretch="Uniform" Stroke="#999" Margin="0 18"></Line>
        </StackPanel>
    </pp:ScrollViewerEx>
</pp:ChromeWindow>