This lower-lever method:
virtual Int_t TVirtualX::RequestString(Int_t x, Int_t y, char *text);
allow you to display and change any text on your screen:
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{
#include "iostream.h"
new TCanvas("cc");
char label[100] = " label to display ";
cout << label << endl;
gVirtualX->RequestString(10, 20, label);
cout << label << endl;
}
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May be to get the several lines you should combine the method above with
TVirtualX::DrawText(); or with TText
I mean first you should draw all lines of the text you want to be present and then
call "RequestString()" in respect of the current cursor position to change the
line your cursor is nearby. (somewhere within TObject::ExecuteEvent() method
of your class)
May be it is not too elegant but may solve your problem. I believe the code you will
write will be not bigger that with any MFC / Motif and Co.
The better solution would be to call gVirtualX->RequestString() by TText::ExecuteEvent
responding on "left - mouse click". (TPaveLabel::ExecuteEvent() etc )
This way the end-user code will need no extra trick at all. May be ROOT team can provide
this.
Valery
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