继续聊WPF——Expander控件（2）

• <Window x:Class="Expander_Sample2.Window1"
• xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
• xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
• Title="Window1" Height="300" Width="300">
• <Window.Resources>
• <!--
• ToogleButton的模板，
• 因为要进和状态切换，故要用到ToggleButton控件
• -->
• <ControlTemplate x:Key="ToggleButtonTemp" TargetType="{x:Type ToggleButton}">
• <Border x:Name="bd"
• BorderThickness="1"
• CornerRadius="1,1,1,1">
• <Border.Background>
• <LinearGradientBrush StartPoint="0.5,0" EndPoint="0.5,1">
• <GradientStop Color="LightGray" Offset="0"/>
• <GradientStop Color="White" Offset="1"/>
• </LinearGradientBrush>
• </Border.Background>
• <Border.BorderBrush>
• <LinearGradientBrush StartPoint="0,0" EndPoint="1,1">
• <GradientStop Color="Black" Offset="0"/>
• <GradientStop Color="Gray" Offset="1"/>
• </LinearGradientBrush>
• </Border.BorderBrush>
• <Path Margin="2,2,2,2" Fill="Black" x:Name="p"
• Data="M 0,0 L 4,5 L8,0 Z"
• HorizontalAlignment="Center"
• VerticalAlignment="Center"/>
• </Border>
• <ControlTemplate.Triggers>
• <Trigger Property="IsMouseOver" Value="True">
• <Setter TargetName="bd" Property="Background">
• <Setter.Value>
• <LinearGradientBrush StartPoint="0.5,0" EndPoint="0.5,1">
• <GradientStop Color="LightGreen" Offset="0"/>
• <GradientStop Color="White" Offset="1"/>
• </LinearGradientBrush>
• </Setter.Value>
• </Setter>
• </Trigger>
• <Trigger Property="IsChecked" Value="True">
• <Setter TargetName="p" Property="Data"
• Value="M0,5 L8,5 L4,0 Z"/>
• </Trigger>
• <Trigger Property="IsEnabled" Value="True">
• <Setter TargetName="bd" Property="BorderBrush" Value="Gray"/>
• <Setter TargetName="p" Property="Fill" Value="Gray"/>
• </Trigger>
• </ControlTemplate.Triggers>
• </ControlTemplate>
• <!--
• Expnder的样式
• -->
• <Style TargetType="{x:Type Expander}">
• <Setter Property="Template">
• <Setter.Value>
• <ControlTemplate TargetType="{x:Type Expander}">
• <Grid>
• <Grid.RowDefinitions>
• <RowDefinition Height="auto"/>
• <RowDefinition x:Name="gr" Height="0"/>
• </Grid.RowDefinitions>
• <BulletDecorator Background="DarkTurquoise" Grid.Row="0" VerticalAlignment="Center" >
• <BulletDecorator.Bullet>
• <ToggleButton Margin="1,1,1,1"  Height="18" Width="18" Template="{StaticResource ToggleButtonTemp}"
• IsChecked="{Binding Path=IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
• OverridesDefaultStyle="True"/>
• </BulletDecorator.Bullet>
• <ContentPresenter HorizontalAlignment="Center" Margin="1,1,1,1" ContentSource="Header"/>
• </BulletDecorator>
• <Border x:Name="scv" Background="LightGray" BorderThickness="1" BorderBrush="Black" Grid.Row="1" >
• <ContentPresenter Margin="0" ContentSource="Content"/>
• </Border>
• </Grid>
• <ControlTemplate.Triggers>
• <Trigger Property="IsExpanded" Value="True">
• <Setter TargetName="gr" Property="Height" Value="{Binding Path=DesiredSize/Height,ElementName=scv}"/>
• </Trigger>
• </ControlTemplate.Triggers>
• </ControlTemplate>
• </Setter.Value>
• </Setter>
• </Style>
• </Window.Resources>
• <Grid>
• <Expander Margin="10,10" Height="210" Width="130" OverridesDefaultStyle="True">
• <Expander.Header>
• <TextBlock Text="相见恨晚" FontWeight="Bold" FontSize="16"/>
• </Expander.Header>
• <TextBlock TextWrapping="Wrap">
• 如果相见不会太晚，我们就不会悲伤，和你堂堂的手牵手，过得好简单，
• 若我有天不见了，或许你会比较快乐，虽然有万般舍不得，也不愿看你难割舍
• 若我有天不在了。请你原谅我的困扰，虽然你给我的不算少，只是我没福气要就算是完美。
• </TextBlock>
• </Expander>
• </Grid>
• </Window>