DocumentWindow click/drag problem

Hi Kasper,

If the left mouse button is up before moving the mouse then the window shouldn't drag. If it seems to happen when something else is working in the background then you may want to check if process is doing something that captures the mouse. This could result in the mouse button being released after the mouse is captured by the other process causing the window to never receive the mouse button up event that would signal the drag shouldn’t happen.

Okay, ~3 more hours of careful testing finally lead me to the real problem - calls to a DoEvents() method, e.g. like the one found here: http://stackoverflow.com/questions/4502037/where-is-the-application-doevents-in-wpf. When I change between two documents, I sometimes have to wait for one BackgroundWorker to finish before starting another one, because they might add stuff to the same resource. Therefore I did something like this:

while(BackgroundWorker1.IsBusy)
	DoEvents();
BackgroundWorker2.RunWorkerAsync();

 This worked very well for me with WinForms, and while I know that DoEvents() is not a part of WPF by design, it is working pretty good here too, except for this weird click-drag-bug. I'm not really sure why it messes up anything for DocumentWindow's though? Any suggestions on how to get around this problem? :)

Hi Kasper,

It's hard to say why DoEvents causes things to break down, but DoEvents calls are not good design to have, even in WinForms.  What you should be doing instead is changing your design such that your BackgroundWorker1 has a RunWorkerCompleted event handler in which you kick off your BackgroundWorker2 instead.  If it's a conditional thing, you can always set a flag somewhere that you examine in your event handler.