Board index » cppbuilder » simple graphic control

2005-11-20 07:49:14 AM
cppbuilder58
The graphic object I am currently using is an extension of the
TGraphicControl class.
class TBoxFrame : public TGraphicControl;
This control works great in every area except for keyboard event handling.
According to the BCB help files, TGraphicControl objects do not support
this. I am looking for another base class to extend, and I need it to
support the following actions:
1) Mouse commands (including OnMouseDown, OnMouseUp, and OnMouseMove...not
just OnClick)
2) Keyboard commands (including KeyDown, KeyUp, etc...not just KeyPress)
3) The ability to draw directly on the object's canvas.
4) The ability to Assign one object of this class to another.
Just wondering if someone could help me out with a good recommendation.
Thanks.
 

Blake Young wrote:
HTH
Jonathan
 

screenshots of the graphical control superimposed on top of a TImage object.
The TGraphicControl remains transparent, but the TCustomControl fills itself
in as gray, which is not what I want. The code producing these two shots is
identical, obviously with the only exception being the name of the base
class. How do I fix that transparency business?
TCustomControl
https://webspace.utexas.edu/youngba2/www/TCustomControl.gif
TGraphicControl
https://webspace.utexas.edu/youngba2/www/TGraphicControl.gif
 

{smallsort}

"Blake Young" < XXXX@XXXXX.COM >wrote in message
constructor. You may also have to override the CreateParams() method to
include the WS_EX_TRANSPARENT style, and/or intercept the WS_ERASEBKGND
message to avoid default drawing.
Gambit