[Mono-winforms-list] Control Painting

[Jonathan S. Chambers]

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:	mono-winforms-list-admin@lists.ximian.com on behalf of Jonathan S. =
Chambers
Sent:	Thu 3/24/2005 10:31 PM
To:	Mono-winforms-list@lists.ximian.com
Cc:=09
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: {			=09
	PaintEventArgs	paint_event;

	paint_event =3D XplatUI.PaintEventStart(Handle);

	if ((control_style & (ControlStyles.AllPaintingInWmPaint | =
ControlStyles.UserPaint)) =3D=3D (ControlStyles.AllPaintingInWmPaint | =
ControlStyles.UserPaint)) {
		OnPaintBackground(paint_event);
	}

	OnPaint(paint_event);
	XplatUI.PaintEventEnd(Handle);
=09
	if (!GetStyle(ControlStyles.UserPaint)) {
		DefWndProc(ref m);
	}
=09
	return;
}

If I read ths correctly, OnPaintBackground will be called if the =
control_style includes ControlStyles.AllPaintingInWmPaint and =
ControlStyles.UserPaint.=20
     I believe this should be the opposite (change =3D=3D to !=3D). 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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