PopupButton and strange focus/drag behavior

Hi David,

Unfortunately, we would need a sample. I tried running through some similar scenarios in our Sample Browser, but was not able to reproduce it.

There is a QuickStart under the Shared Library section of the Sample Browser that shows how to use the ClosePopup command. If you still can't get that work, then please send over a sample for that also.

OK, I figured out what it really is.

I'm using a DragDrop helper class that traps MouseDown/MouseUp/MouseMove events. When it sees a MouseDown, it starts paying attention, and when it sees a MouseUp, it stops paying attention.

What is happening is that I'm getting the MouseDown when the PopupButton is clicked, but I am not getting the MouseUp. As a result, when the popup closes, the underlying screen still thinks that the drag is going on.

Is this clear?

I presume that this is happening because the PopupButton is capturing the Mouse or some such. The DragDrop helper class is ignorant of context, and just listens to messages - is there any generic event that it could listen for to tell when this sort of thing has happened? Worse case, do you think just handling the PopupOpened routed event (and treating that as a MouseUp) would work?

As to closing the popup - the exampe in the QuickStart tie the ClosePopup command to a button in XAML. I'm trying to figure out how to best close the popup from code. I'm currently just saying "IsPopupOpen = false;" - is that the right way, or should I do something else (like fire the command). And, if the right way is to fire the command, how do I do that in code? I.e., something like ClosePopup.Execute(null, this);

Hi David,

You may be able to listen to the PopupOpened/PopupClosed events. Another option might be to listen for the Mouse.GotMouseCapture and Mouse.LostMouseCapture events. I'm not exactly sure which would be best for your situation though.

As for closing the Popup, you can certainly set the IsPopupOpen to false. The ClosePopup command is meant to be used by a Button inside the Popup to allow the end-user the ability to close a Popup that stays open. It sounds like setting IsPopupOpen is what you need.

Excellent - thanks!

I actually went ahead and tried trapping the PopupOpened event and treating that the same as ButtonMouseUp, and that seemed to work. The Mouse.Got/Lost capture events might be better - at least, they would be more generic (since the PopupOpened event is specific to the PopupButton). I'll try those.

Again, thank you for the continuous excellent support.

David