Also,
I am responding to the user dragging the divider in the property grid to
resize the two columns. In the OnMouseMove event, if the user is resizing the
columns, I draw and then call Refresh(). Supposedly this should cause an
immediate repaint (and the code in Control.Refresh() appears to do this).
However, I get many more MouseMove events fired before the actual repaint
happens (causing more draws and Refresh calls). This causes the dragging to
appear very jagged. Is this correct behavior, I mean should I be able to
receive many MouseMoveEvents before OnPaint is actually called due to my call
to Refresh?
Thanks Again,
Jonathan
-----Original Message-----
From: [EMAIL PROTECTED] on behalf of Jonathan S. Chambers
Sent: Thu 3/24/2005 10:31 PM
To: [email protected]
Cc:
Subject: [Mono-winforms-list] Control Painting
In Control.cs in the WndProc method, the handling of the paint event is as
follows:
case Msg.WM_PAINT: {
PaintEventArgs paint_event;
paint_event = XplatUI.PaintEventStart(Handle);
if ((control_style & (ControlStyles.AllPaintingInWmPaint |
ControlStyles.UserPaint)) == (ControlStyles.AllPaintingInWmPaint |
ControlStyles.UserPaint)) {
OnPaintBackground(paint_event);
}
OnPaint(paint_event);
XplatUI.PaintEventEnd(Handle);
if (!GetStyle(ControlStyles.UserPaint)) {
DefWndProc(ref m);
}
return;
}
If I read ths correctly, OnPaintBackground will be called if the control_style
includes ControlStyles.AllPaintingInWmPaint and ControlStyles.UserPaint.
I believe this should be the opposite (change == to !=). If
ControlStyles.AllPaintingInWmPaint and ControlStyles.UserPaint are set (i.e.
everything is done in OnPaint), OnPaintBackground should not be called.
I have tried to change my drawing code from using the WndProc to
overriding OnPaint. This change helps a bit (I don't see the background color
flash), but my drawing seems much slower (almost as if double buffering is not
working with this method???).
- Jonathan
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