> Yep, this was suggested as a workaround only, either to see how it
> can be done (just for learning), or if one really wants to use
> Fl_Pack. Deriving from Fl_Pack (as I assume you meant above) for
> another container widget and do the polling makes things even worse,
> but I assume that you only wrote it for the same reasons as I did.
Yes, indeed.
I think the better thing is to make your own container based on Fl_Group, since
that gives more control over how the "packed" widgets will finally be drawn
anyway...
Also, more or less as an aside, I think your (Albrecht's) analysis of how
Fl_Pack is "causing" this issue is correct - since I was already poking at
marty's code, I tweaked it to use a timer as you had suggested (only for the
purposes of experiment of course!) and the code now "works as expecetd"...
----------
// marty - button add example
#include <iostream>
#include <string>
#include <cstdio>
#include <cstdlib>
#include <FL/Fl.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_Menu_Button.H>
#include <FL/Fl_Menu_Item.H>
#include <FL/Fl_Pack.H>
#include <FL/Fl_Window.H>
using std::cout;
using std::endl;
using std::string;
static Fl_Pack* G1;
static Fl_Window* WIN;
static int idx = 0;
static Fl_Color LBG = FL_DARK_BLUE;
static Fl_Color LFG = FL_WHITE;
static Fl_Color LSC = FL_BLUE;;
static Fl_Color LTC = FL_WHITE;
static Fl_Font LFONT = (FL_HELVETICA | FL_BOLD);
static Fl_Fontsize FSIZE = 20;
static int LSPC = 5;
enum eop { DEL=-1, ADD=1 };
class Sbut : public Fl_Menu_Button
{
public:
Sbut (int i);
static void onButton ( Fl_Widget* w, void* v);
int handle ( int event );
int i() { return _i; }
int _i;
};
//ffffffffffffffffffffffffffff
void clearTo ( int idx )
{
cout << "clearto " << idx << ": ";
Fl_Widget* w;
int last = G1->children()-1;
if ( last > idx )
cout << " removing ";
{
// remove last to idx
for ( int i=last; i>-1; i-- )
{
if ( i != idx )
{
cout << i << " ";
w = G1->child(i);
G1->remove(w);
delete w;
}
}
}
WIN->redraw();
cout << endl;
}
//////////////////////////////
static void pop_on_timeout(void *v)
{
Sbut* sb = (Sbut*)v;
WIN->redraw();
cout << "pop_on_timeout: popping menu" << endl;
sb->popup();
}
//hhhhhhhhhhhhhhhhhhhhhhhhhhhh
void onMenu (Fl_Widget* w, void* v)
{
eop op = (eop)fl_intptr_t(v);
Sbut* sb;
if ( op == ADD )
{
cout << "onMenu: add" << endl;
sb = new Sbut(idx);
G1->add(sb);
idx++;
Fl::add_timeout(0.2, pop_on_timeout, (void*)sb);
}
else if ( op == DEL )
{
cout << "onMenu 2: deleting" << endl;
int i = G1->find(w);
clearTo(i);
sb = (Sbut*)G1->child(0);
Fl::add_timeout(0.2, pop_on_timeout, (void*)sb);
}
}
//mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
Fl_Menu_Item xMenu[] = {
{"add button to end, and popup menu", 0, onMenu, (void*)ADD},
{"delete other buttons, and popup menu", 0, onMenu, (void*)DEL},
{0}
};
//cccccccccccccccccccccccccc
Sbut::Sbut (int id )
: Fl_Menu_Button( 0, 0, 100, 50)
{
// cout << "Sbut(s) 0: " << id << endl;
_i = idx;
callback(onButton);
char _cstr[16];
sprintf(_cstr, "%i", id);
copy_label(_cstr);
// cout << "label = " << label() << endl;
color( LBG, LSC);
labelcolor(LFG);
labelfont(LFONT);
labelsize(FSIZE);
menu(xMenu);
if ( menu() )
{
Fl_Menu_Item* mi; // non-const pointer
mi = (Fl_Menu_Item*)menu();
int sz = mi->size();
for ( int j=0; j<sz; j++ )
{
// cout << "set: " << j << endl;
color(LBG, LSC);
mi->labelsize(FSIZE);
mi->labelfont(LFONT);
mi->labelcolor(LFG);
mi = mi->next();
}
}
}
//hhhhhhhhhhhhhhhhhhhhhhhhhH
int Sbut::handle ( int event )
{
if ( event == FL_PUSH )
{
cout << "Sbut handle 1: PUSH " << endl;
do_callback();
return 1;
}
return 0;
}
//hhhhhhhhhhhhhhhhhhhhhhhhhH
void Sbut::onButton ( Fl_Widget* w, void* v)
{
int i = G1->find(w);
cout << "Sbut onButton 0: " << i << endl;
Sbut* sb = (Sbut*)w;
sb->popup();
}
//***********************
int main (int argc, char **argv)
{
Sbut* sb;
WIN = new Fl_Window(0, 0, 200, 300);
G1 = new Fl_Pack(0, 0, 150, 150);
G1->begin();
for ( int i=0; i<5; i++ )
{
sb = new Sbut(i);
idx++;
}
G1->end();
WIN->end();
// WIN->resizable(G1);
WIN->resizable(WIN);
WIN->show(argc, argv);
return Fl::run();
}
/* end of file */
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