无废话WPF系列18：控件模版

控件模版ControlTemplate就是设置控件的外观，比如我们常见到的按钮是下面这样的，但是我们如何改变成圆形的呢?

<Window x:Class="DeepXAML.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:DeepXAML"       
        xmlns:sys="clr-namespace:System;assembly=mscorlib"
        Title="MainWindow" Height="250" Width="450">
    <Window.Resources>
        <Style x:Key="roundButton" TargetType="Button">
            <Setter Property="Background">
                <Setter.Value>
                    <LinearGradientBrush StartPoint="0.5,0" EndPoint="0.5,1">
                        <LinearGradientBrush.GradientStops>
                            <GradientStop Offset="0.0" Color="#fff" />
                            <GradientStop Offset="1.0" Color="Red" />
                        </LinearGradientBrush.GradientStops>
                    </LinearGradientBrush>
                </Setter.Value>
            </Setter>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="Button">
                        <Grid>
                            <Ellipse Fill="{TemplateBinding Background}"></Ellipse>
                            <ContentPresenter Margin="5" HorizontalAlignment="Center" VerticalAlignment="Center" />                        </Grid>                   
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>    
    </Window.Resources>
    <StackPanel x:Name="stackPanel">
        <Button Width="200" Height="120" Margin="20" Style="{StaticResource ResourceKey=roundButton}">OK</Button>
    </StackPanel>
</Window>

ItemsControl有个PanelTemplate可以控制ItemsControl的条目容器。