Event that fires after element is resized.

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+1 Q:

Event that fires after element is resized.

Here is a problem: after loading some visual elements, I need to change something knowing their new sizes. There is MeasureOverride method, but it is called before changing the size. Is there any method that is called after it?

P.S. I know that I can calculate new sizes having old ones, but new sizes aren't calculated simply. It would be much easier to just use such an event (if it exists).

+2 A:

Are you looking for the FrameworkElement.SizeChanged event?

MSDN's description:

Occurs when either the ActualHeight or the ActualWidth properties change value on a FrameworkElement.

EDIT:

This article has a good description of both the SizeChanged and LayoutUpdated events, including an overview of how the layout loop works.

Donut 2010-10-04 12:49:22

Thanks for article, but unfortunately it also occurs before elements are resized.

Sergey 2010-10-04 13:36:28

"SizeChanged is raised whenever the size (either ActualHeight or ActualWidth) has changed on the object, and is raised after the Measure and Arrange passes are complete." - So it does happen AFTER element resized.

Denis 2010-10-04 20:22:14

>> "So it does happen AFTER element resized."I wish it was true, because it would simplify my work a lot. I tried this event on my application and experimentally found that it occurs before actual resizing.>>"SizeChanged is raised whenever the size (either ActualHeight or ActualWidth) has changed on the object, and is raised after the Measure and Arrange passes are complete."Having read this quotation, I suppose that everything happens in the following order: Measure - Arrange - SizeChanged - actual resizing of the visual objects.

Sergey 2010-10-05 13:05:50

@Sergey, you keep saying that it occurs before. Are you sure it's not just being called multiple times? If you put a breakpoint in the `SizeChanged` event handler, it might *appear* to only happen "before actual resizing." However, this event continues to be called each time the size is updated.

Donut 2010-10-05 13:09:33

>> Are you sure it's not just being called multiple times? I'm sure it is called 1 time per resize. Let me explain my test. I just put MessageBox.Show(this.View.PlotRect.Width.ToString()) to SizeChanged event handler. When I maximize the window, MessageBox shows 559. When I make window smaller, it shows 1160. (Visual element become bigger when window becomes bigger).

Sergey 2010-10-05 13:17:03

Thank you for the article! Now I understand my mistake: I should have used e.NewSize, not something like this.Size!

Sergey 2010-10-05 13:23:05

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Event that fires after element is resized.

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