Feature request: Trigger support #1362

jamesnet214 · April 30, 2023, 5:42pm

Feature request: Trigger support

opened 02:18PM - 09 Feb 18 UTC

enhancement question api

If I understand correctly, there are no Triggers in Avalonia right now. I think …it would be beneficial to support them since they allow for dynamic UI that's dependant on a model or another control's state. Here are few examples of how I use Triggers in my projects. The syntax is Ammy, but I think it's understandable enough. ``` alias TopBarButton(buttonName) { Button { Style: Style { TargetType: Button Triggers: [ @DataTrigger_SetProperty(bind "SelectedView", $buttonName, "BorderThickness", "1") ] } } } ``` This trigger watches `SelectedView` property on a ViewModel and when it equals `$buttonName` (passed parameter), it would set `BorderThickness` to 1. Or even something like this, which changes the `Button`s content depending on `IsCollapsed` property: ``` Style: Style { TargetType: Button #Setter("Content", "▲") #Add_DataTrigger_SetProperty(bind IsCollapsed, true, "Content", "▼") } ``` In some cases, you can replace triggers with Binding Converters, but it is more cumbersome, and not always possible (for example if you set the `ControlTemplate`).

AvaloniaUI Trigger 지원 관련 GitHub Issue 내용 한번 가져와봤습니다.

opened 2018년 2월 9일

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Feature request: Trigger support #1362

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