[lazarus] Object inspector edit/combobox

Mattias Gaertner nc-gaertnma at netcologne.de
Tue Aug 26 11:52:16 EDT 2003

On Tue, 26 Aug 2003 17:33:28 +0200
Micha Nelissen <M.Nelissen at student.tue.nl> wrote:

> Mattias Gaertner wrote:
> > On Tue, 26 Aug 2003 17:02:16 +0200
> > Micha Nelissen <M.Nelissen at student.tue.nl> wrote:
> > 
> > 
> >>Hi,
> >>
> >>Why the following code?
> >>
> >>     ValueEdit.Parent:=Parent;
> >>     ValueComboBox.Parent:=Parent;
> >>     ValueButton.Parent:=Parent;
> >>
> >>Why not set the parent of these controls to the eventgrid/propertygrid 
> >>which is much more logical IMHO. If the eventgrid and it's valueedit 
> >>have the same parent, they're fighting for the z-order, while the 
> >>valueedit should be on top, no?
> > 
> > debugging, I think, we should keep it robust and basic (as all general
> > IDE parts), so that any new interface will find it easier to get the IDE
> > running.
> > The OI creates the grids before the edit controls, so that the grids
> > should ly below them. If the win32 intf is not able to keep the z order,
> > then I wonder how the VCL achieves it.
> > Maybe something is recreating the grid handle?
> Some time ago, the edit worked, but the combobox did not. It did appear, 
> but when it disappeared it was gone for good. The window handle was 
> destroyed and it did not come back. I changed the parent of the combobox 
> to be the grid itself and that worked nicely, so I thought: why would 
> you not want it like this. 

Just to avoid misunderstandings: 
I want it. My idea was the following: Every gui supports a z-order and every
new intf will have it from the beginning. OTOH implementing a custom control
with client area, child controls and scrollbars can be tricky. So, I assumed
the current trick as easier to get things going.
Of course we can add an interface function to ask what to use.

> However: with current cvs it does seem to 
> work; the combobox does appear, and keeps doing so, so it probably was 
> another bug.

I think, we need more examples. The next interface will then be easier to
implement. We can create a sub directory example/interfacetests for it.
Every test example is welcome. 


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