For my attempt to fix the problems in the gtk2 TabControl implementation
I need some background information. Can anybody help me, or continue my
started update?
In the first step I try to keep the dummy page, that is created together
with the notebook widget, and use it for all tabs. I also managed to
have the associated dummy tab invisible, but at sudden the
implementation started to behave inconsistenly. Sometimes adding tabs
(in code) works, but in most cases no tabs are shown at all. Reverting
the code to the previously working implementation didn't help, so that
it looks like some random behaviour, as known from uninitialized local
variables.
Concrete questions:
- What's the purpose of the page widget, required in many gtk_notebook
procedures?
- How is the page Handle defined and managed?
Is it the address of the associated gtk widget?
In my TabCtrl model I use a dummy LCL page (TCustomPage) to transfer
parameters to the widgetset. In the Win32 widgetset I could prevent code
from dealing with a page without an allocated Handle, but this seems to
cause trouble with gtk2. Since now two dummy pages are used, one in the
LCL code and one in the gtk2 code, can I assign the "handle" of the gtk2
dummy page widget to the LCL dummy page? How? Can I simply assign the
pointer to the page widget to the TCustomPage.Handle?
- How does the gtk2 widgetset determine the ClientRect (of a notebook)?
The reported ClientWidth and ClientHeight look good (smaller than the
notebook Width and Height), regardless of whether the added tabs are
shown or invisible. Could it be that the client origin is wrong, i.e.
the dummy page sits at the topleft of the control and makes the tabs
invisible?
- When I put an button on a TabCtrl, at design time, that button also is
visible at runtime, regardless of whether the tabs themselves are shown
or invisible. This seems to indicate that the dummy page widget is the
parent of the button.
I can upload the patch with the current state of my gtk2 modifications
and a test program, that shows both a TPageControl and TNewTabControl
side by side, for the verification that the modifications do not affect
the behaviour of the page control.
DoDi
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