下面的XAML执行以下操作:当鼠标位于文本块上时,其文本将放大,当鼠标离开文本块时,其文本会缩小。单击鼠标时,文本大小会冻结。
当文本框的样式直接设置为SwellingTexblock资源时,这可以正常工作。但是,当样式设置为继承自SwellingTexblock的StyleWrapper样式时,单击鼠标时会出现以下异常(荷兰语):
Kan de naam EnlargeFont niet binnen het namenbereik van System.Windows.Style vinden。
这意味着:在System.Windows.Style的名称范围内找不到EnlargeFont。发生了什么事?
<Window x:Class="TriggerSpike.Window2"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window2" Height="300" Width="300">
<Window.Resources>
<Style x:Key="SwellingTextBlock" TargetType="TextBlock">
<Style.Triggers>
<EventTrigger RoutedEvent="MouseEnter">
<EventTrigger.Actions>
<BeginStoryboard Name="EnlargeFont">
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty="FontSize"
To="60" Duration="0:0:10"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
<EventTrigger RoutedEvent="MouseLeave">
<EventTrigger.Actions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty="FontSize"
To="12" Duration="0:0:.5"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
<EventTrigger RoutedEvent="MouseDown">
<PauseStoryboard BeginStoryboardName="EnlargeFont"/>
</EventTrigger>
</Style.Triggers>
</Style>
<Style x:Key="StyleWrapper" BasedOn="{StaticResource SwellingTextBlock}"
TargetType="TextBlock"/>
</Window.Resources>
<StackPanel>
<TextBlock Style="{StaticResource StyleWrapper}">test</TextBlock>
</StackPanel>
</Window>