WPF: IsPressed-Trigger von ControlTemplate funktioniert nicht
Ich verwende ein benutzerdefiniertes Steuerelement mit dem NamenImageButton
um eine Schaltfläche mit verschiedenen Bildern anzuzeigen.ImageButton
enthält Abhängigkeitseigenschaften:
public ImageSource DisabledImageSource
{
get { return (ImageSource)GetValue(DisabledImageSourceProperty); }
set { SetValue(DisabledImageSourceProperty, value); }
}
public ImageSource NormalImageSource
{
get { return (ImageSource)GetValue(NormalImageSourceProperty); }
set { SetValue(NormalImageSourceProperty, value); }
}
public ImageSource HoverImageSource
{
get { return (ImageSource)GetValue(HoverImageSourceProperty); }
set { SetValue(HoverImageSourceProperty, value); }
}
public ImageSource PushedImageSource
{
get { return (ImageSource)GetValue(PushedImageSourceProperty); }
set { SetValue(PushedImageSourceProperty, value); }
}
public static readonly DependencyProperty DisabledImageSourceProperty =
DependencyProperty.Register("DisabledImageSource", typeof(ImageSource), typeof(ImageButton), new UIPropertyMetadata());
public static readonly DependencyProperty NormalImageSourceProperty =
DependencyProperty.Register("NormalImageSource", typeof(ImageSource), typeof(ImageButton), new UIPropertyMetadata());
public static readonly DependencyProperty HoverImageSourceProperty =
DependencyProperty.Register("HoverImageSource", typeof(ImageSource), typeof(ImageButton), new UIPropertyMetadata());
public static readonly DependencyProperty PushedImageSourceProperty =
DependencyProperty.Register("PushedImageSource", typeof(ImageSource), typeof(ImageButton), new UIPropertyMetadata());
Sein Stil ist wie folgt definiert:
<Style TargetType="{x:Type local:ImageButton}">
<Setter Property="HorizontalAlignment" Value="Left"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Grid>
<Image Name="image" Source="{Binding NormalImageSource, RelativeSource={RelativeSource TemplatedParent}}" Stretch="None" />
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter TargetName="image" Property="Source" Value="{Binding DisabledImageSource, RelativeSource={RelativeSource TemplatedParent}}"/>
</Trigger>
<Trigger Property="Button.IsPressed" Value="True">
<Setter TargetName="image" Property="Source" Value="{Binding PushedImageSource, RelativeSource={RelativeSource TemplatedParent}}"/>
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsMouseOver" Value="True" />
</MultiTrigger.Conditions>
<Setter TargetName="image" Property="Source" Value="{Binding HoverImageSource, RelativeSource={RelativeSource TemplatedParent}}"/>
</MultiTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Alles funktioniert gut, außerIsPressed
. Ich kann das eingestellte Bild nie sehenPushedImageSource
und ich kann nicht herausfinden warum. Jede Hilfe wäre dankbar :)
Hier ist der XAML-Code, der es testet
<Window x:Class="SMEClient.WPF.Tester.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:is="clr-namespace:Project1.SearchBox;assembly=Project1"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/Project1;component/SearchBox/ImageButton.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Window.Resources>
<Grid>
<StackPanel>
<is:ImageButton NormalImageSource="C:\Users\Public\Pictures\Sample Pictures\Koala.jpg"
PushedImageSource="C:\Users\Public\Pictures\Sample Pictures\Chrysanthemum.jpg"
HoverImageSource="C:\Users\Public\Pictures\Sample Pictures\Jellyfish.jpg"/>
</StackPanel>
</Grid>
</Window>