Behavior with Event inside Style

05 Jun 2019, 18:16

Hi
I implemented Behavior in which there is an Event. If I attach this Behavior to the element that is inside Style.ControlTemplate ..., then the event is not called. When invoking Event, the list of delegates is empty. As I understand it, when using inside Styles, you need to clone the Behavior created in Style.

How to act in this case?

In the method of

         Noesis::Ptr<Noesis::Freezable> LayoutDragElementBehavior::CreateInstanceCore() const
	{
		return *new LayoutDragElementBehavior(mDragEvent);
	}

I create a Behavior instance with an existing event. It works.

        <TabControl x:Name="tab" Visibility="Collapsed" TabStripPlacement="Bottom" BorderThickness="0.5" BorderBrush="#303030" SelectionChanged="OnTabSelectionChanged">
          <TabControl.Resources>     
        
              <Style TargetType="{x:Type TabItem}">
                <Setter Property="Template">
                  <Setter.Value>
                    <ControlTemplate TargetType="{x:Type TabItem}">
                      <Grid Height="25">
                     		<i:Interaction.Behaviors>
                         		 <docking:LayoutDragElementBehavior OnDrag="OnTabItemDrag"/>
                      		  </i:Interaction.Behaviors>
                        
                        <Border Name="Border" Background="Transparent"  BorderThickness="0" CornerRadius="0"  Margin="0"  BorderBrush="#303030">
                          <TextBlock />
                        </Border>
                      </Grid>
                    </ControlTemplate>
                  </Setter.Value>
                </Setter>
              </Style>
        
          </TabControl.Resources>
        </TabControl>

06 Jun 2019, 17:46

Hi,

The Freezable class exposes the virtual method CloneCommonCore() where any inheriting class can perform their own clone code.

For example, the TriggerBase class in the Interactivity package (available in the Native SDK under Src/Packages/App/Interactivity/Src folder) uses that method to clone its collection of actions:

void NoesisApp::TriggerBase::CloneCommonCore(const Freezable* source)
{
    ParentClass::CloneCommonCore(source);

    TriggerActionCollection* thisActions = GetActions();

    TriggerBase* trigger = (TriggerBase*)source;
    TriggerActionCollection* actions = trigger->GetActions();
    int numActions = actions->Count();
    for (int i = 0; i < numActions; ++i)
    {
        Ptr<TriggerAction> action = actions->Get(i)->Clone();
        thisActions->Add(action);
    }
}

I think it is better to use the default constructor in the CreateInstanceCore method, and override the CloneCommonCore for extending the clone process.

07 Jun 2019, 08:07

Thanks

10 Jun 2019, 12:56

Marking as solved. Thanks for your feedback.

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