z:EdgeTrigger

z:EdgeTrigger is a Behaviour that evaluates a 'Rising' or 'Falling' z:Function when a Condition changes

Usage

<ContentPage.Behaviors>
    <z:EdgeTrigger 
        Condition="<some z:Bind>" 
        Rising="<some z:Function>"
        Falling="<some z:Function>" />
</ContentPage.Behaviors>

For example, to show or hide UI based on a player data found in the ViewModel

<ContentPage.Behaviors>
    <z:EdgeTrigger 
        Condition="{z:Bind '(Player.Score GTE 50) AND (Player.IsVerified == true)'}" 
        Rising="{z:Function 'IsVisible=true', Source={x:Reference TheAchevementUi}}"
        Falling="{z:Function 'IsVisible=false', Source={x:Reference TheAchevementUi}}" />
</ContentPage.Behaviors>