Hi ROOTers (Fons),
I need a 'widget' or sort of ListBox to select a color. I was thinking of
using a TGComboBox for this, but don't succeed to get it working.
By idea is the following:
Instead of adding 'text' as 'entry' via
TGComboBox::AddEntry(char *s, Int_t id);
I add a TGLBEntry with
TGComboBox* fComboBox;
<....>
fComboBox->AddEntry(lbe, lhints);
where
lbe = new TGLBEntry(fComboBox->GetListBox()->GetContainer, id,
kHorizontalFrame, entryColor);
lhints = new TGLayoutHints(kLHintsExpandX | kLHintsTop);
where 'entryColor' is the color I want for the entry.
This seems not to work at all (the TGPopupComboBox is empty => no
entries).
This is the first part I don't understand. It might be that this is
because of the comment in the TGListBox class description (i.e. 'Currently
entries are simple text strings (TGTextLBEntry)'). But it seems strange
to me that I need to use a TGTextLBEntry, instead of the base class
TGLBEntry (which is used in the TGListBox!!!) if I don't want the extra
functionality of adding text.
But to continue I tried using a TGTextLBEntry which I then give the
required entryColor as background color. now I use:
lbe = new TGTextLBEntry(fComboBox->GetListBox()->GetContainer(),
new TGString("don't want this string"), id,
theGC,
theFont,
kHorizontalFrame,
entryColor),
where theGC and theFont are GC and FontStruct defined as mentioned in
guitest.cxx.
What happens is that I indead get the entry in the TGComboBox (I infact
add more TGTextLBEnties with different color) with a color (not the one I
want, but that's for later concern.) But when I select an entry the
'selected entry' does not have the 'right' background color anymore.
Looking into the source code it seems that this is caused by:
TGTextLBEntry::Update(TGLBEntry *e)
{ SetText(new TGString(((TGTextLBEntry *)e)->GetText())); }
which only updates the text...
This seems not to bring me any further. My question(s);
- am I on the right way to implement the 'widget' that I want (i.e. a
color selector)?
- Did anybody implement something like that already (in a different way?)
- any suggestions (Fons?)
Thanks, and keep up the good work,
Rutger van der Eijk.
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