gistfile1.cpp

#include <iostream>
#include <cstdlib>

#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Text_Display.H>
#include <FL/Fl_Multiline_Input.H>

using namespace std;

Fl_Window * window;
Fl_Window * subwindow;

// #define ADD_REMOVE

#ifdef ADD_REMOVE
// Add/remove subwindow
// The console appears properly the first time, and is removed properly.
// On subsequent activations, the console remains invisible after show until window is resized.
static void ShowCB(Fl_Widget * widget, void * data) {
    window->add(subwindow);
    subwindow->show();
    // subwindow->redraw();
    window->redraw();
}

static void HideCB(Fl_Widget * widget, void * data) {
    subwindow->hide();
    // subwindow->redraw();
    window->remove(subwindow);
    window->redraw();
}
#else
// Show/hide subwindow
// Console remains invisible after show until window is resized.
// Hide works as expected.
static void ShowCB(Fl_Widget * widget, void * data) {
    subwindow->show();
    window->redraw();
}

static void HideCB(Fl_Widget * widget, void * data) {
    subwindow->hide();
    window->redraw();
}
#endif

int main(int argc, char * argv[])
{
    Fl_Button * button;
    
    {
        subwindow = new Fl_Window(0, 360, 512, 360);
        subwindow->resizable(subwindow);
        
        int hmargin = 30;
        int vmargin = 20;
        int w = subwindow->w() - hmargin*2;
        int h = 20;
        int x = hmargin;
        int y = 20;
        
        h = subwindow->h() - 20 - vmargin*2;
        Fl_Text_Display * display = new Fl_Text_Display(x, y, w, h);
        display->buffer(new Fl_Text_Buffer());
        y += h;
        
        h = 20;
        Fl_Multiline_Input * input = new Fl_Multiline_Input(x, y, w, h);
        
        subwindow->end();
    }
    
    {
        window = new Fl_Window(512, 720);
        window->resizable(window);
        
        int hmargin = 30;
        int w = window->w() - hmargin*2;
        int h = 20;
        int ym = 10;
        int x = hmargin;
        int y = 150;
        
        button = new Fl_Button(x, y, w, h, "Show console");
        y += h + ym;
        button->callback(ShowCB);
        
        button = new Fl_Button(x, y, w, h, "Hide console");
        y += h + ym;
        button->callback(HideCB);
        
#ifndef ADD_REMOVE
        window->add(subwindow);
        subwindow->hide();
#endif
        
        window->end();
    }
    
    window->show(argc, argv);
    
    return Fl::run();
}