CODEWITHSUNDEEP
wpfbindingcontroltemplate
Giffesnaffen
Giffesnaffen

Reputation: 560

Trigger has no Binding property

During i reading up on WPF i have run into a problem trying to create a binding on the Trigger in a template, used to create an image button. 

<ControlTemplate x:Key="ToolbarButtonHover" TargetType="Button">
    <Grid Name="backgroundGrid">
        <Image Source="{DynamicResource ResourceKey=Img}" Width="{TemplateBinding Width}" Height="{TemplateBinding Height}"></Image>
    </Grid>
    <ControlTemplate.Triggers>
        <Trigger Property="Button.IsPressed" Value="True">
            <Setter TargetName="backgroundGrid" Property="Background" Value="#007ACC" />
        </Trigger>
        <!--Error: The property 'Binding' was not found in type Trigger-->
        <Trigger Binding="{Binding Path=IsMouseOver, RelativeSource={RelativeSource TemplatedParent}}" Value="True">
            <Setter TargetName="backgroundGrid" Property="Background" Value="Red" />
        </Trigger>
    </ControlTemplate.Triggers>
</ControlTemplate>

Results in the Error The property 'Binding' was not found in type Trigger, more specifically its the line <Trigger Binding="{ Path=IsMouseOver, RelativeSource={RelativeSource TemplatedParent}}" Value="True">That generates it.

What is the reason for this error?

Upvotes: 2

Views: 2182

Answers (1)

user1228
user1228

Reputation:

Probably because there is no Binding property on the Trigger class as you can see here.

You probably are looking for a DataTrigger.

<ControlTemplate x:Key="ToolbarButtonHover" TargetType="Button">
    <Grid Name="backgroundGrid">
        <Image Source="{DynamicResource ResourceKey=Img}" Width="{TemplateBinding Width}" Height="{TemplateBinding Height}"></Image>
    </Grid>
    <ControlTemplate.Triggers>
        <Trigger Property="Button.IsPressed" Value="True">
            <Setter TargetName="backgroundGrid" Property="Background" Value="#007ACC" />
        </Trigger>
        <!--Look below, DataTrigger -->
        <DataTrigger Binding="{Binding Path=IsMouseOver, RelativeSource={RelativeSource TemplatedParent}}" Value="True">
            <Setter TargetName="backgroundGrid" Property="Background" Value="Red" />
        </Trigger>
    </ControlTemplate.Triggers>
</ControlTemplate>

Upvotes: 10

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