Windows API: Change color of appframe background 2005-02-03 -- Jim Gambon Newsgroups: softvelocity.clarion.language
> How can I change the background color of the appframe window? On
> MDI/SDI windows you can just set the background window, but you can't
> on APPLICATION windows. Any good ideas?
I just tested this out in C6. It requires no sub-classing, and I think it
works as you need it. What it does is change the appframe's class to use a
brush of your own definition. For your example of "solid white" do this:
In Global or Module level map put these Win32 API definitions:
MODULE('Win32API')
GetClassLong PROCEDURE(LONG thehWnd,LONG theIndex),|
LONG,PASCAL,NAME('GetClassLongA')
SetClassLong PROCEDURE(LONG thehWnd,LONG theIndex,LONG theNewValue),|
LONG,PROC,PASCAL,NAME('SetClassLongA')
CreateSolidBrush PROCEDURE(LONG TheColor),LONG,PASCAL,NAME('CreateSolidBrush')
DeleteObject PROCEDURE(LONG theObject),LONG,PROC,PASCAL,NAME('DeleteObject')
END !MODULE
You will also need, if you want, this equate:
GCL_HBRBACKGROUND EQUATE(-10)
Then, in the AppFrame procedure, create some LONG variables for saving the
brushs.
SaveNewBrush LONG
SaveOldBrush LONG
Next, right after the OPEN(AppFrame) statement in ThisWindow.Init (so that you
catch it before any actual screen activity takes place) put this:
SaveOldBrush = GetClassLong(AppFrame{PROP:ClientHandle},GCL_HBRBACKGROUND)
SaveNewBrush = CreateSolidBrush(0FFFFFFh) ! Solid White
IF SaveNewBrush <> 0
SetClassLong(AppFrame{PROP:ClientHandle},GCL_HBRBACKGROUND,SaveNewBrush)
END !IF
Finally, reset and delete the brush objects in the TakeCloseEvent handler for
the ThisWindow object:
IF SaveOldBrush <> 0
SetClassLong(AppFrame{PROP:ClientHandle},GCL_HBRBACKGROUND,SaveOldBrush)
SaveOldBrush = 0
END !IF
IF SaveNewBrush <> 0
DeleteObject(SaveNewBrush)
SaveNewBrush = 0
END !IF
I haven't tried it out yet, but I bet you could create a number of cool brush
objects to paint the background.
Let me know if this works well for you, and does not have any unpleasant
side-effects.
Best regards,
Jim
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