WPF之触发器

简单触发器
<Window x:Class="WpfApp.Window1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp"
        mc:Ignorable="d"
        Title="Window1" Height="450" Width="800">
    <Window.Resources>
        <Style x:Key="BigFontButton"><!--命名为大字体-->
            <Setter Property="Control.FontFamily" Value=" Times new Roman"></Setter>
            <Setter Property="Control.FontSize" Value="32"></Setter>
            <Style.Triggers><!--触发器集合-->
                <Trigger Property="Control.IsFocused" Value="True"><!--获取焦点触发-->
                    <Setter Property="Control.Foreground" Value="DarkRed"></Setter><!--触发内容为变红色-->
                </Trigger>
            </Style.Triggers>
        </Style>
    </Window.Resources>
    <Grid>
        <Button Content="Button" Style="{StaticResource BigFontButton}"/>

    </Grid>
</Window>

结果button获取焦点后 字体变红

<Window x:Class="WpfApp.Window1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp"
        mc:Ignorable="d"
        Title="Window1" Height="450" Width="800">
    <Window.Resources>
        <Style x:Key="BigFontButton"><!--命名为大字体-->
            <Setter Property="Control.FontFamily" Value=" Times new Roman"></Setter>
            <Setter Property="Control.FontSize" Value="32"></Setter>
            <Style.Triggers><!--触发器集合-->
                <MultiTrigger>
                    <MultiTrigger.Conditions>
                        <Condition Property="Control.IsFocused" Value="True"></Condition>
                        <Condition Property="Control.IsMouseOver" Value="True"></Condition>
                    </MultiTrigger.Conditions>
                    <MultiTrigger.Setters>
                        <Setter Property="Control.Foreground" Value="Red"></Setter>
                    </MultiTrigger.Setters>
                </MultiTrigger>
                
            </Style.Triggers>
        </Style>
    </Window.Resources>
    <StackPanel VerticalAlignment="Center">
        <Button Content="Button" Style="{StaticResource BigFontButton}"/>
        <TextBox Margin="10" Text="必须满足两个条件才能触发触发器"/>
    </StackPanel>
</Window>

事件触发器

<Window x:Class="WpfApp.Window2"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp"
        mc:Ignorable="d"
        Title="Window2" Height="450" Width="800">
    <Window.Resources>
        <Style x:Key="EventTrriger">
            <Style.Setters>
                <Setter Property="Control.FontSize" Value="red"></Setter>
                <Setter Property="Control.FontFamily" Value="Yellow"></Setter>
            </Style.Setters>
            <Style.Triggers>
                <EventTrigger RoutedEvent="Mouse.MouseEnter">
                    <EventTrigger.Actions>
                        <BeginStoryboard>
                            <Storyboard>
                                <DoubleAnimation Duration="0:0:0.2" Storyboard.TargetProperty="FontSize" To="48"></DoubleAnimation>
                            </Storyboard>
                         </BeginStoryboard>
                    </EventTrigger.Actions> 
                </EventTrigger><!--路由事件-->
                
            </Style.Triggers>
        </Style>
    </Window.Resources>
    <StackPanel>
        <Button Name="bt_1" Content="事件触发器" Style="{StaticResource EventTrriger}"/>
    </StackPanel>
</Window>