I see my version of delphi, doesn't have Key Events(OnKeyDown, OnKeyUp, OnKeyPress) events for TPaintBox. I would like to process something like that. Had somebody a paintbox with these events?
I need Key Events for TPaintBox
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Like TLama said, you'll need to inherit from TCustomControl. But you'll need some additional code to publish all keyboard events. You could choose the easy way and inherit from TPanel since TPanel already exposes a Canvas and a number of keyboard events.
But here's some code to show how to create and register a new control that published the properties of TCustomControl and introduces a new OnPaint event:
If you create a new Package, add this unit, and install it, you will have a new TGTPaintBox control that can have the focus (although you don't see it). It can retrieve keyboard input too.
I've added some functionality in an attempt to make the control transparent, because a PaintBox is too. One disadvantage is that you need to repaint the parent to clear the previously drawn content. In the demo application this is easy enough. I just invalidate the form instead of the control. :p
If you don't need it, you can remove
WMEraseBkGnd
,CreateParams
andSetParent
from the control.Small demo: Put a label on a form. Put a TGTPaintBox on top of it and make it a bit larger. Then add a timer, and maybe some other controls.
Make sure you set the TabStop property of the GTPaintBox to
True
.Then, implement the following events;