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[STR New]

Link: https://www.fltk.org/str.php?L2639
Version: 1.4-feature


Attached file "str2639_rsz_gr.cxx"...


Link: https://www.fltk.org/str.php?L2639
Version: 1.4-feature

#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Button.H>

Fl_Group *p1;
Fl_Group *g1, *g2, *g3;

////////////////////////////////////////////////////////////////

static void b1_cb(Fl_Widget *w, void *data) {
  Fl_Group *g2 = (Fl_Group *)data;
  if (g2->visible()) {
    // hide g2 first
    g2->hide();
    // resize g3 to occupy the space of g2
    g3->resize(g3->x(), g3->y() - g2->h(), g3->w(), g3->h() + g2->h());
    // optionally resize the hidden widget g2 (doesn't matter)
    // g2->resize(g2->x(), g2->y(), g2->w(), 0);
    // init_sizes() is required after rearranging children
    g2->parent()->init_sizes();
    g2->parent()->redraw();
  }
}

static void b2_cb(Fl_Widget *w, void *data) {
  Fl_Group *g2 = (Fl_Group *)data;
  if (!g2->visible()) {
    // resize g2 first with a *fixed* height (this can't be avoided)
    g2->resize(g2->x(), g2->y(), g2->w(), 30);
    // resize g3 to free the space used by g2
    g3->resize(g3->x(), g3->y() + g2->h(), g3->w(), g3->h() - g2->h());
    g2->show();
    // init_sizes() is required after rearranging children
    g2->parent()->init_sizes();
    g2->window()->redraw();
  }
}

int main(int argc, char **argv) {
  int ww = 400, wh = 400, ypos = 0;
  Fl_Button *b1, *b2;

  Fl_Window *window = new Fl_Window(ww, wh, "Fl_Group test");
  window->begin();
  p1 = new Fl_Group(0, 0, ww, wh);
  p1->begin();
  // a Pack with a resizable widget inside
  g1 = new Fl_Group(0, ypos, ww, 30, "Group 1");
  g1->align(FL_ALIGN_CENTER | FL_ALIGN_INSIDE);
  g1->box(FL_UP_BOX);
  g1->color(FL_CYAN);
  g1->end();
  ypos += g1->h();

  g2 = new Fl_Group(0, ypos, ww, 30, "Group 2");
  g2->align(FL_ALIGN_CENTER | FL_ALIGN_INSIDE);
  g2->box(FL_UP_BOX);
  g2->color(FL_RED);
  g2->end();
  ypos += g2->h();

  g3 = new Fl_Group(0, ypos, ww, 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();
  ypos += g3->h();
  b1 = new Fl_Button(0, ypos, ww, 30);
  b1->label("Hide G2");
  b1->callback(b1_cb, g2);
  ypos += b1->h();
  b2 = new Fl_Button(0, ypos, ww, 30);
  b2->label("Show G2");
  b2->callback(b2_cb, g2);
  p1->end();
  p1->resizable(g3);
  window->end();
  window->resizable(p1);
  window->show();
  return Fl::run();
}