index > Windows Forms General > Input redirection / Inconsistence between SPY++ messages / DefWndProc messages

Input redirection / Inconsistence between SPY++ messages / DefWndProc messages

At my company we are developing an canvas that will be used to visually create data synchronization business rules.

What I am trying to achieve is the ability to use WinForms controls within the CanvasItems. In the current prototype I composite the canvas myself by rendering the controls using DrawToBitmap and use the composite engine to nicely layout/overlay/draw lines between items, etc etc. (also think about things like rubberband selection).

Graphically we achieve great flexibility by the indirect rendering however I am fighting with input redirection.

Not only do I want to redirect the input on the canvas to the right control within the canvasitem, I also want the ability to 'transform' inputs. (think about rotated controls). This works fine for things like mouse-over. (I am transforming and after that PostMessage mousemoves translated to NCHITTESTs, and such) however it fails for things like mouse clicks on a button.

I am not fishing for a complete solution, I am fishing for any information that could help me to understand in depth the message handling of window controls. For example I see different messages between SPY++ and an DefWndProc override within a control that inheretences from a button. (I am really interested in the story behind this).

Any help, any pointers on this issue will help me.

Thanks a lot in advance.

Synap Tuesday, September 23, 2008 3:54 PM

You should override WndProc, not DefWndProc. The latter is only used when a control didn't have any use for a message and default processing should be done. You'd miss the interesting ones.

nobugz Tuesday, September 23, 2008 8:58 PM

Thanks, that helps a lot already! I also found an very interesting article:
http://msdn.microsoft.com/nl-nl/magazine/cc163617(en-us).aspx

I am still not getting clicks events though, will have to dig into that deeper.

Synap Wednesday, September 24, 2008 2:32 PM

You should override WndProc, not DefWndProc. The latter is only used when a control didn't have any use for a message and default processing should be done. You'd miss the interesting ones.

nobugz Tuesday, September 23, 2008 8:58 PM

Synap Wednesday, September 24, 2008 2:32 PM

You can use google to search for other answers

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