[fltk.general] Understanding Fl_Pack. - Forums

I have used Fl_Pack in the past and I always struggle with its behavior.

In the sample attached demo program I have an Fl_Pack that contains an Fl_Gl_Window widget and a normal Fl_Group inside an Fl_Pack.

I would like the Fl_Gl_Window widget to stretch and fill the Fl_Pack whenever the Fl_Group is hidden when the Hide button is clicked. How can I do that?

#include <iostream>

#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Pack.H>
#include <FL/Fl_Group.H>
#include <FL/math.h>

#include <FL/gl.h>
#include <FL/Fl_Gl_Window.H>

class shape_window : public Fl_Gl_Window {
void draw();
public:
int sides;
shape_window(int x,int y,int w,int h,const char *l=0);
void resize( int X,int Y,int W,int H )
{
std::cerr << "win resize W=" << W << std::endl;
Fl_Gl_Window::resize( X, Y, W, H );
}
};

shape_window::shape_window(int x,int y,int w,int h,const char *l) :
Fl_Gl_Window(x,y,w,h,l) {
sides = 3;
}

void shape_window::draw() {
if (!valid()) {
valid(1);
glLoadIdentity();
glViewport(0,0,pixel_w(),pixel_h());
}
// draw an amazing but slow graphic:
glClear(GL_COLOR_BUFFER_BIT);
glColor3f( 0.5, 0.5, 0.75 );

glBegin(GL_POLYGON);
for (int j=0; j<sides; j++) {
double ang = j*2*M_PI/sides;
glVertex3f((GLfloat)cos(ang), (GLfloat)sin(ang), 0);
}
glEnd();
}

// when you change the data, as in this callback, you must call redraw():
void hide_cb(Fl_Widget *o, void *p) {
Fl_Group *d = (Fl_Group *)p;
if ( d->visible() ) {
std::cerr << "hide grp= " << d << std::endl;
d->hide();
}
else {
std::cerr << "show grp= " << d << std::endl;
d->show();
}
Fl_Pack* pack = (Fl_Pack*)d->parent();
std::cerr << "pack= " << pack << std::endl;
pack->init_sizes();
pack->redraw();
}

int main(int argc, char **argv) {

Fl::use_high_res_GL(1);
Fl_Window window(300, 370);
window.begin();

Fl_Pack pack(10, 75, 280, 280);
std::cerr << "pack= " << &pack << std::endl;
pack.type( Fl_Pack::HORIZONTAL );
pack.color( FL_CYAN );
//pack.box( FL_FLAT_BOX );
pack.begin();

int H = window.h()-90;
int W = pack.w()/2;

shape_window sw(10, 75, W, H );
sw.end();

Fl_Group grp( 0, 75, W, H );
std::cerr << "grp= " << &grp << std::endl;
grp.color( FL_RED );
grp.box( FL_FLAT_BOX );
grp.end();

pack.resizable(&sw);
pack.end();

Fl_Button button(30, 5, W, 30, "Hide");
button.callback( hide_cb, &grp );

window.resizable( &pack );

window.end();
window.show(argc,argv);

return Fl::run();
}

—
Gonzalo Garramuno
ggarra13@gmail.com

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