The fltk2 ScrollGroup does not allow transparency: is this correct?
The following short program shows that the upper widget is transparent:
------------------------------
// fltk-2.0.x-r6960/test/hello.cxx
#include <fltk/Window.h>
#include <fltk/Widget.h>
#include <fltk/run.h>
#include <fltk/draw.h>
#include <fltk/Color.h>
using namespace fltk;
class Upper: public Widget
{
public:
Upper(int X, int Y, int W, int H):
Widget(X,Y,W,H){ box(NO_BOX); }
void draw()
{
setfont(HELVETICA_BOLD, 32);
setcolor(RED);
drawtext("Upper Text :-)", Rectangle(w(),h()), ALIGN_CENTER);
}
};
int main()
{
Window *window = new Window(300, 180);
window->begin();
Widget *wid = new Widget(20, 40, 260, 100, "Hello, World!");
wid->box(UP_BOX);
wid->labelfont(HELVETICA_BOLD_ITALIC);
wid->labelsize(36);
wid->labeltype(SHADOW_LABEL);
wid->color(YELLOW);
Widget *upper = new Upper(20, 40, 260, 100);
window->end();
window->show();
return run();
}
------------------------------
Now I try the same with a ScrollGroup.
I create a ScrollGroup and write a text into its canvas child.
TEST 1:
=======
I add a ScrollGroup to this ScrollGroup. I give the child ScrollGroup
a box(NO_BOX) and give its canvas child a box(NO_BOX). I expect
the text of the first ScrollGroup to be visible within the child
ScrollGroup. The text is invisible. The child ScrollGroup is opaque.
TEST 2:
=======
I replace the child ScrollGroup with a Group ( group->box(NO_BOX)
and canvas->box(NO_BOX) ). The text is visible. The child Group is
transparent.
Is there no way to make a ScrollGroup transparent?
winfried
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