實現
這篇文章給了一個不錯的參考方案.
http://www.codeproject.com/Articles/19141/WPF-Checkbox-Text-On-Left-Side
但是因為只是想把開關文字換一個位置,我覺得應該有CheckBox默認的模板再稍作修改就可以了.而且上面那個文章的方案在對其上面和原來的CheckBox有所不同.
所以我去看了一下CheckBox默認的模板.以下是和今天內容相關的部分.
<Setter Property="Control.Template"> <Setter.Value> <ControlTemplate TargetType="CheckBox"> <BulletDecorator Background="#00FFFFFF" SnapsToDevicePixels="True"> <BulletDecorator.Bullet> <mwt:BulletChrome Background="{TemplateBinding Panel.Background}" BorderBrush="{TemplateBinding Border.BorderBrush}" RenderMouseOver="{TemplateBinding UIElement.IsMouseOver}" RenderPressed="{TemplateBinding ButtonBase.IsPressed}" IsChecked="{TemplateBinding ToggleButton.IsChecked}" /> </BulletDecorator.Bullet> <ContentPresenter RecognizesAccessKey="True" Content="{TemplateBinding ContentControl.Content}" ContentTemplate="{TemplateBinding ContentControl.ContentTemplate}" ContentStringFormat="{TemplateBinding ContentControl.ContentStringFormat}" Margin="{TemplateBinding Control.Padding}" HorizontalAlignment="{TemplateBinding Control.HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding Control.VerticalContentAlignment}" SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}" /> </BulletDecorator> </ControlTemplate> </Setter.Value> </Setter>
這里有一個很重要的類就是BulletDecorator,這是一個Decorator元素,它具有兩個內容屬性: Bullet 和 Child。 Bullet 屬性定義用作項目符號的 UIElement。 Child 屬性定義以可視化方式與該項目符號對齊的 UIElement。 也就是兩個東西,左邊的是Bullet右邊的那個是Child.他們會自動對齊.所以解決方案就是把Bullet和Child的內容對換一下就好了.這里需要注意的是,BulletChrome是在clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Aero的程序集中.所以項目需要添加PresentationFramework.Aero.dll的引用,這個文件在C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0下面.而且需要在XAML文檔中聲明.
下面給我修改后的源文件.
<Window x:Class="TreeAndCheckBox.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:Microsoft_Windows_Themes="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Aero" Title="MainWindow" Height="350" Width="525"> <Window.Resources> <ResourceDictionary> <Style TargetType="{x:Type CheckBox}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type CheckBox}"> <BulletDecorator SnapsToDevicePixels="True" Background="#00FFFFFF"> <BulletDecorator.Bullet> <ContentPresenter SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}" Margin="{TemplateBinding Control.Padding}" VerticalAlignment="{TemplateBinding Control.VerticalContentAlignment}" HorizontalAlignment="{TemplateBinding Control.HorizontalContentAlignment}" ContentStringFormat="{TemplateBinding ContentControl.ContentStringFormat}" ContentTemplate="{TemplateBinding ContentControl.ContentTemplate}" Content="{TemplateBinding ContentControl.Content}" RecognizesAccessKey="True"/> </BulletDecorator.Bullet> <Microsoft_Windows_Themes:BulletChrome Background="{TemplateBinding Panel.Background}" IsChecked="{TemplateBinding ToggleButton.IsChecked}" RenderPressed="{TemplateBinding ButtonBase.IsPressed}" RenderMouseOver="{TemplateBinding UIElement.IsMouseOver}" BorderBrush="{TemplateBinding Border.BorderBrush}"/> </BulletDecorator> </ControlTemplate> </Setter.Value> </Setter> </Style> </ResourceDictionary> </Window.Resources> <Grid> <CheckBox Content="測試CheckBox" HorizontalAlignment="Left" VerticalAlignment="Top" /> </Grid> </Window>