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[STR New]
Link: http://www.fltk.org/str.php?L2639
Version: 1.3-current
Fl_Pack resizes hidden widgets, which it doesn't
touch when visible:
The tiny example program illustrates the point:
* resize the window back and forth and both "Group 1" and
"Group 2" keep their heights. OK here.
* With a small window, hide "Group 2" and resize to a big
window, then show "Group 2". It grew while hidden!?
This bug makes it hard to find a way to code a hideable UI panel.
There're workarounds but they're not easy to find as the docs
don't shed light on it.
Workaround examples:
1) remove Group2 after hiding, re-insert on show.
2) resize Group2 to 0,0 upon hide, then resize again upon show.
It'd be great to have a simple and obvious way to do it.
Link: http://www.fltk.org/str.php?L2639
Version: 1.3-current#include <stdio.h>
#include <stdlib.h>
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Widget.H>
#include <FL/Fl_Group.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Pack.H>
Fl_Pack *p1;
Fl_Group *g1, *g2, *g3;
////////////////////////////////////////////////////////////////
static void b1_cb(Fl_Widget *w, void *data) {
Fl_Group *g2 = (Fl_Group *)data;
if (g2->visible()) {
g2->hide();
g3->size(g3->w(),g3->h()+g2->h());
g2->window()->redraw();
}
}
static void b2_cb(Fl_Widget *w, void *data) {
Fl_Group *g2 = (Fl_Group *)data;
if (!g2->visible()) {
g3->size(g3->w(),g3->h()-g2->h());
g2->show();
g2->window()->redraw();
}
}
int main(int argc, char **argv) {
Fl_Button *b1, *b2, *b3;
Fl_Window *window = new Fl_Window(400, 400, "Fl_Pack test");
window->begin();
p1 = new Fl_Pack(0,0,400,400);
p1->type(Fl_Pack::VERTICAL);
p1->begin();
// a Pack with a resizable widget inside
g1 = new Fl_Group(0,0,0,30, "Group 1");
g1->align(FL_ALIGN_CENTER|FL_ALIGN_INSIDE);
g1->box(FL_UP_BOX);
g1->color(FL_CYAN);
g1->end();
g2 = new Fl_Group(0,0,0,30, "Group 2");
g2->align(FL_ALIGN_CENTER|FL_ALIGN_INSIDE);
g2->box(FL_UP_BOX);
g2->color(FL_RED);
g2->end();
g3 = new Fl_Group(0,0,0,280, "Group 3 R e s i z a b l e");
g3->align(FL_ALIGN_CENTER|FL_ALIGN_INSIDE);
g3->box(FL_UP_BOX);
g3->color(FL_GREEN);
g3->end();
b1 = new Fl_Button(0,340,50,30);
b1->label("Hide G2");
b1->callback(b1_cb, g2);
b2 = new Fl_Button(0,370,50,30);
b2->label("Show G2");
b2->callback(b2_cb, g2);
p1->end();
p1->resizable(g3);
window->end();
window->resizable(window);
window->show();
return Fl::run();
return 0;
}
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