Saturday, June 30, 2012

wpf triggers, first lesson

I believe
- property triggers -- live inside a style including embedded control template
- data triggers -- live inside 1) data templates 2) styles, or a 3) control template embedded in a Style.
( Note data template only accepts data triggers, not property triggers.  See http://stackoverflow.com/questions/17598200/datatrigger-binding-in-wpf-style )

Triggers are predominantly created in xaml. It's possible to do it in c#, but rare.

Triggers are all about Visual-effects. All these triggers modify the properties of visuals.  PTriggers watch properties; DTriggers watch data; ETriggers watch ...

Most common trigger is the property trigger. 2 other common types are Data trigger and Event trigger.


It's best to internalize one simple property-trigger usage, before looking at advanced triggers. As seen below (example from [[wpf  succinctly]]), you can have 2 triggers on a visual. The 2 triggers can hit the same visual Property like the background color, but only one trigger will fire.

Different aspects (properties) of the visual can be managed through different setters within a Singel trigger. Each setter sets one (depedency) property to control one aspect.

<Trigger Property="IsMouseOver" Value="True">
   <Setter TargetName="Border" Property="Background" Value="DarkBlue" />
</Trigger>

<Trigger Property="IsPressed" Value="True">
   <Setter TargetName="Border" Property="Background" Value="Purple" />
   <Setter TargetName="Border" Property="BorderBrush" Value="DarkKhaki" />
</Trigger>

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http://www.linkedin.com/in/tanbin