Hi Rooters/Fons,
First: the example with the possibility to embed a TCanvas in a TGFrame
looks promising. I was waiting for this, and will try it myself later this
week.
Concerning the GContext_t etc...:
I have some problems using GContext_t etc.. to make a red TGLabel of a
certain font. I see that a font is part of a GContext_t, so I define a
GContext_t in a similair way as in the guitest.cxx example.
i.e. in my case:
-----------
// create new graphics context
FontStruct_t labelfont;
labelfont = gClient->GetFontByName(
"-adobe-helvetica-medium-r-*-*-18-*-*-*-*-*-iso8859-1");
GCValues_t gval;
gval.fMask = kGCForeground | kGCFont;
gval.fFont = gGXW->GetFontHandle(labelfont);
gClient->GetColorByName("red", gval.fForeground);
fTextGC = gGXW->CreateGC(gClient->GetRoot()->GetId(), &gval);
---------
Now when I use this gcontext for a TGLabel:
--------
fTextLabelLayout = new TGLayoutHints(kLHintsTop | kLHintsExpandX,
10, 10, 10, 10);
fTextLabel1 = new TGLabel(this, "Outer Tracker", fTextGC);
AddFrame(fTextLabel1, fTextLabelLayout);
Resize(fTextLabel1->GetWidth(), fTextLabel1->GetHeight());
------ (in reality more complicated) ------
my frame is resized to a size as if i had a font of size '12', instead of
the 18 as in 'labelfont' up here. It might be that I'm doing
something wrong here. It's not completely clear to me when I should use
Resize(XXX), and what a later Resize(XXX) of a motherframe does with the
previous one. But when I look at the constructor of TGLabel i see that the
datamembers fTWidth and fTHeight are set according to the FontStruct_t
passed as argument to the constructor, i.e,
------
TGLabel(const TGWindow *p, TGString *text,
GContext_t norm = fgDefaultGC,
FontStruct_t font = fgDefaultFontStruct,
UInt_t options = kChildFrame,
ULong_t back = fgDefaultFrameBackground);
------
the problems is that because I don't specify this FontStruct_t I get the
default font struct. This then overrides the one in my specified
GContext_t. It seems strange to me that if I specify a GContext_t, which
already contains something for the font, I should still specify a
FontStruct. Maybe some check in the constructor is appropriate
here (for example on the fMask member).
Thanks,
Rutger
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