wpf，事件触发器这样为什么不行

货郎大叔 2018-11-05 06:12:25



<Style x:Key="buttonstyle" TargetType="Button">

    <Style.Triggers>

        <Trigger Property="IsMouseOver" Value="true">

            <Trigger.EnterActions>

                <BeginStoryboard >

                    <Storyboard>

                        <DoubleAnimation Storyboard.TargetProperty="Width" From="60" To="200" Duration="0:0:1" />

                    </Storyboard>

                </BeginStoryboard>

            </Trigger.EnterActions>

            <Trigger.ExitActions>

                <BeginStoryboard >

                    <Storyboard>

                        <DoubleAnimation Storyboard.TargetProperty="Width" From="200" To="60" Duration="0:0:1" />

                    </Storyboard>

                </BeginStoryboard>

            </Trigger.ExitActions>

        </Trigger>

    </Style.Triggers>

</Style>

上面是一个带动画的样式，鼠标移上去和离开的动画，但是，如果改成下面这样，为什么不行：



<Style x:Key="buttonstyle" TargetType="Button">

    <Style.Triggers>

        <Trigger Property="IsMouseOver" Value="true">

            <Trigger.EnterActions>

                <BeginStoryboard >

                    <Storyboard>

                        <DoubleAnimation Storyboard.TargetProperty="Width" From="60" To="200" Duration="0:0:1" />

                    </Storyboard>

                </BeginStoryboard>

            </Trigger.EnterActions>

        </Trigger>

        <Trigger Property="IsMouseOver" Value="false">

            <Trigger.EnterActions>

                <BeginStoryboard >

                    <Storyboard>

                        <DoubleAnimation Storyboard.TargetProperty="Width" From="200" To="60" Duration="0:0:1" />

                    </Storyboard>

                </BeginStoryboard>

            </Trigger.EnterActions>

        </Trigger>

    </Style.Triggers>

</Style>

我把IsMouseOver为true和为false的触发器，都各自单独写，这样结果是触发器好像不执行。这是为什么呢？

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小马快跑！ 2018-11-06

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你的 <Trigger Property="IsMouseOver" Value="false">有问题，你可以尝试下如下： <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> <EventTrigger RoutedEvent="Mouse.MouseLeave"> <EventTrigger.Actions> <BeginStoryboard> <Storyboard> <DoubleAnimation Duration="0:0:0.2" Storyboard.TargetProperty="FontSize" To=" 18"></DoubleAnimation> </Storyboard> </BeginStoryboard> </EventTrigger.Actions> </EventTrigger> </Style.Triggers> </Style>