第11章 样式(1)——概述、创建和使用

样式：封装一系列属性的集合，如外边距、内边距、颜色、字体等。

①一般在设置样式时都要指明TargeType属性，否则用Setter设置属性时会非常麻烦，比如必须写Button.FontSize或TextBlock.FontFamily等。

②若定义样式的时候不使用x:Key键名，则TargeType属性就会作为自动应用样式的快捷键。

③样式的键名有两种写法，它俩是等效的：x:Key="{x:Type Button}"和x:Key="Button"

④通过设置元素的Style="{x:Null}"，可以删除自动应用的样式。

下面列举三个个样式的实例代码：

属性触发器例子：

<Window x:Class="Styles.SimpleTriggers"    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/PResentation"    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"    Title="SimpleTriggers" Height="300" Width="300"    >  <Window.Resources>    <Style x:Key="BigFontButton">      <Style.Setters>        <Setter Property="Control.FontFamily" Value="Times New Roman" />                <Setter Property="Control.FontSize" Value="18" />            </Style.Setters>      <Style.Triggers>        <Trigger Property="Control.IsFocused" Value="True">          <Setter Property="Control.Foreground" Value="DarkRed" />        </Trigger>        <Trigger Property="Control.IsMouSEOver" Value="True">          <Setter Property="Control.Foreground" Value="LightYellow" />          <Setter Property="Control.FontWeight" Value="Bold" />        </Trigger>                <Trigger Property="Button.IsPressed" Value="True">          <Setter Property="Control.Foreground" Value="Red" />        </Trigger>      </Style.Triggers>    </Style>  </Window.Resources>  <StackPanel Margin="5">    <Button Padding="5" Margin="5" Style="{StaticResource BigFontButton}" >A Customized Button</Button>    <TextBlock Margin="5">Normal Content.</TextBlock>    <Button Padding="5" Margin="5">A Normal Button</Button>    <TextBlock Margin="5">More normal Content.</TextBlock>    <Button Padding="5" Margin="5" Style="{StaticResource BigFontButton}">Another Customized Button</Button>  </StackPanel></Window>
事件触发器例子：
<Window x:Class="Styles.EventTriggers"    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"    Title="EventTriggers" Height="300" Width="300"    >  <Window.Resources>    <Style x:Key="BigFontButton">      <Style.Setters>        <Setter Property="Control.FontFamily" Value="Times New Roman" />        <Setter Property="Control.FontSize" Value="18" />        <Setter Property="Control.FontWeight" Value="Bold" />      </Style.Setters>            <Style.Triggers>        <EventTrigger RoutedEvent="Mouse.MouseEnter">          <EventTrigger.Actions>            <BeginStoryboard>              <Storyboard>                <DoubleAnimation                  Duration="0:0:0.2"                  Storyboard.TargetProperty="FontSize"                  To="22"  />              </Storyboard>            </BeginStoryboard>          </EventTrigger.Actions>        </EventTrigger>        <EventTrigger RoutedEvent="Mouse.MouseLeave">          <EventTrigger.Actions>            <BeginStoryboard>              <Storyboard>                <DoubleAnimation                  Duration="0:0:1"                  Storyboard.TargetProperty="FontSize"  />              </Storyboard>            </BeginStoryboard>          </EventTrigger.Actions>        </EventTrigger>      </Style.Triggers>    </Style>      </Window.Resources>  <StackPanel Margin="5">    <Button Padding="5" Margin="5" Style="{StaticResource BigFontButton}">A Customized Button</Button>    <TextBlock Margin="5">Normal Content.</TextBlock>    <Button Padding="5" Margin="5">A Normal Button</Button>    <TextBlock Margin="5">More normal Content.</TextBlock>    <Button Padding="5" Margin="5" Style="{StaticResource BigFontButton}">Another Customized Button</Button>  </StackPanel></Window>自动应用样式例子：
<Window x:Class="Styles.AutomaticStyles"    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"    Title="AutomaticStyles" Height="300" Width="300"    >  <Window.Resources>    <Style TargetType="Button">      <Setter Property="FontFamily" Value="Times New Roman" />      <Setter Property="FontSize" Value="18" />      <Setter Property="FontWeight" Value="Bold" />    </Style>  </Window.Resources>  <StackPanel Margin="5">    <Button Padding="5" Margin="5">Customized Button</Button>    <TextBlock Margin="5">Normal Content.</TextBlock>    <Button Padding="5" Margin="5" Style="{x:Null}"            >A Normal Button</Button>    <TextBlock Margin="5">More normal Content.</TextBlock>    <Button Padding="5" Margin="5">Another Customized Button</Button>  </StackPanel></Window>