(This didn't get answered on fltk-dev, perhaps this is a better place
to ask.)
I'd like to know if it's a bug that the attached program needs to
explicitly call redraw() in the callback. It's just a scrolled
vertical list of buttons that delete themselves when clicked. If the
button callback does not call redraw() on the ScrollGroup then the
image of the bottom button remains even though there is no widget
there any more. Bug or feature?
Regards,
Jeremy Henty
#include <stdio.h>
#include <fltk/run.h>
#include <fltk/Widget.h>
#include <fltk/Button.h>
#include <fltk/Window.h>
#include <fltk/ScrollGroup.h>
#include <fltk/PackedGroup.h>
static void button_callback(fltk::Widget *widget, void *vp);
class Callback_Data
{
private:
friend void button_callback(fltk::Widget *widget, void *vp);
fltk::ScrollGroup *scroll;
fltk::PackedGroup *pack;
public:
Callback_Data(fltk::ScrollGroup *scroll, fltk::PackedGroup *pack) :
scroll(scroll), pack(pack) { }
};
static void button_callback(fltk::Widget *widget, void *vp)
{
Callback_Data *data = (Callback_Data *)vp;
data->pack->remove(widget);
data->scroll->redraw();
delete data;
delete widget;
}
int main()
{
fltk::Window *window = new fltk::Window(100,100,"Scroller");
window->begin();
fltk::ScrollGroup *scroll = new fltk::ScrollGroup(0,0,100,100);
scroll->type(fltk::ScrollGroup::VERTICAL);
scroll->begin();
fltk::PackedGroup *pack = new fltk::PackedGroup(0,0,100,100);
pack->begin();
char label[20];
for (int ii = 0; ii < 10; ii++) {
sprintf(label, "Button: %2d", ii);
fltk::Button *button = new fltk::Button(0,0,100,25);
button->copy_label(label);
button->callback(button_callback);
button->user_data(new Callback_Data(scroll, pack));
}
pack->end();
scroll->end();
window->resizable(scroll);
window->end();
window->size_range(100,100);
window->show();
fltk::run();
}
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