>
> I imagine it would make a difference if you added a button,
> and had the button's callback move the widgets around.
It doesn't seem to matter. Here's the revised version.
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_Button.H>
#include <FL/Fl.H>
class DBox : public Fl_Box {
public:
DBox(int x, int y, int w, int h, char const* label = 0)
: Fl_Box(x, y, w, h, label)
{
box(FL_DOWN_BOX);
}
};
DBox* bx1;
DBox* bx2;
DBox* bx3;
DBox* bx4;
void btn_cb(Fl_Widget*, void* win)
{
static bool closed = true;
if(closed) {
bx1->position(bx1->x() - 10, bx1->y() - 10);
bx2->position(bx2->x() + 10, bx2->y() - 10);
bx3->position(bx3->x() - 10, bx3->y() + 10);
bx4->position(bx4->x() + 10, bx4->y() + 10);
closed = false;
}
else {
bx1->position(bx1->x() + 10, bx1->y() + 10);
bx2->position(bx2->x() - 10, bx2->y() + 10);
bx3->position(bx3->x() + 10, bx3->y() - 10);
bx4->position(bx4->x() - 10, bx4->y() - 10);
closed = true;
}
// static_cast<Fl_Double_Window*>(win)->init_sizes();
static_cast<Fl_Double_Window*>(win)->redraw();
}
int main()
{
Fl_Double_Window win(200, 200);
bx1 = new DBox(50, 50, 50, 50);
bx2 = new DBox(100, 50, 50, 50);
bx3 = new DBox(50, 100, 50, 50);
bx4 = new DBox(100, 100, 50, 50);
Fl_Button* btn = new Fl_Button(170, 170, 30, 30);
btn->callback(btn_cb, &win);
win.end();
win.resizable(&win);
win.show();
return Fl::run()
}
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