Hi,
What I suggest does not need to use CD to draw on the canvas. The idea is
to use the canvas just to handle mouse messages, and use BGCOLOR to set a
background color for the handler.
Something like this:
IupCbox(
IupVbox(
IupCanvas(NULL),
IupText(NULL),
NULL),
NULL);
If the cbox is not occupying the whole dialog then you can place it inside
a IupFrame or a IupBackgroundBox, so you can set the background to white.
Then set BGCOLOR of the IupCanvas to something different then white to use
it as a handler, to move the vbox around the cbox.
You must set CX and CY on the vbox so it will be positioned inside the cbox.
Then implement the button_cb and motion_cb callbacks of the canvas, and use
the drag delta of the canvas to change cx and cy. Take a look at the source
code of the IupSbox or the IupSplit that both use this same approach to
implement a moving handler.
Best,
Scuri
On Sat, Aug 16, 2014 at 12:51 PM, Karagy <[email protected]> wrote:
> I ran this example using iuplua5.1.exe version 3.11.
>
> 8/16/2014 18:16, Milind Gupta пишет:
> > Hi Karagy,
> > Thanks for looking at it. I tried running the file you send
> but I
> > get the following error:
> >
> > lua: cd_buttons.wlua:112: attempt to call field 'backgroundbox' (a nil
> > value)
> > stack traceback:
> > cd_buttons.wlua:112: in main chunk
> > [C]: ?
> >
>
>
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