Your handle() method is not passing events it received
down to the handle() method of the base class (Fl_Group::handle())
and therefore the group and all widgets in it are not seeing events
(like mouse clicks)
When you define a handle() method your class, all events
normally sent to the widget are instead sent to your handle()
method.
It's up to you to pass the events down to the base class,
otherwise you'll eclipse the base class and all its children
from seeing any events.
So I'd advise at the top of your handle() method:
int ret = Fl_Group::handle(e);
..and change your switch statement around to set *ret = 1*
whenever you've handled an event you don't want FLTK to send
on to other widgets (ie. indicating you 'handled' it), eg:
int ret = Fl_Group::handle(e);
[..]
if [..] {
switch ( e ) {
static int pos_org[2] = { 0, 0 };
case FL_PUSH:
pos_org[0] = x() - Fl::event_x();
pos_org[1] = y() - Fl::event_y();
ret = 1; // <-- ADD THIS
break;
case FL_RELEASE:
//G_window->redraw();
break;
case FL_DRAG:
position(pos_org[0]+Fl::event_x(), pos_org[1]+Fl::event_y());
G_window->redraw();
ret = 1; // <-- ADD THIS
break;
default:
//ret = 0; // <-- REMOVE THIS
break;
}
return ret;
}
On 06/13/11 10:26, jseb wrote:
> Hello,
>
> I tried and crated a cusom widget, using the sample found here:
>
> http://seriss.com/people/erco/fltk/#SliderInput
>
>
> The goal is to build a «connector».
> It's a box, which would have little «anchors» on it (anchors are
> represent with little buttons).
> In the (i hope) near future, my connectors will be linked using anchors
> (and a line between the links).
>
> For the moment, i'm stuck with the buttons callback. I've defined it in
> the constructor, but it is never called, so the connector "event"
> function always drag the connector.
>
> Look: button's callback is defined in connector constructor, but it's
> never called.
>
> Thank you for having a look at this.
>
> /*
> g++ -o connector.{elf,cpp} $(fltk-config --cxxflags --ldflags)
> -I/usr/include/FL
> */
>
> #include <stdio.h>
> #include <Fl.H>
> #include <Fl_Double_Window.H>
> #include <Fl_Box.H>
> #include <Fl_Button.H>
> #include <Fl_Group.H>
>
> Fl_Double_Window *G_window = 0;
>
> class Connector : public Fl_Group {
> private:
> Fl_Box *box ;
> Fl_Button *btn ;
> int btn_is_pushed ;
>
> int handle(int e) {
> int ret = 1;
> if (!btn_is_pushed) {
> switch ( e ) {
> static int pos_org[2] = { 0, 0 };
> case FL_PUSH:
> pos_org[0] = x() - Fl::event_x();
> pos_org[1] = y() - Fl::event_y();
> break;
>
> case FL_RELEASE:
> //G_window->redraw();
> break;
>
> case FL_DRAG:
> position(pos_org[0]+Fl::event_x(), pos_org[1]+Fl::event_y());
> G_window->redraw();
> break;
>
> default:
> ret = 0;
>
> }
> return ret;
> }
> }
>
> //it seems we never enter this function.
> static void CB_btn(Fl_Widget *w, void *data) {
> int *d = (int *) data;
> Connector *connector = dynamic_cast<Connector *>(w);
> switch (*d) {
> case FL_PUSH:
> printf("pushed!");
> connector->btn_is_pushed=1;
> break;
> case FL_RELEASE:
> printf("released!");
> connector->btn_is_pushed=0;
> break;
> default:
> printf("default!");
> break;
>
> }
>
> }
>
>
> public:
>
> Connector (int x,int y,int w,int h,const char *l=0) :
> Fl_Group(x,y,w,h,l) {
> box = new Fl_Box(x,y,w,h);
> box->box (FL_BORDER_BOX);
> box->color ((Fl_Color) 0xccddee00);
>
> btn=new Fl_Button(this->x()+10, this->y()+5, 10,10);
> btn->callback(CB_btn, (void*)btn /*this*/);
> // btn->when(FL_WHEN_ENTER_KEY|FL_WHEN_NOT_CHANGED);
>
> end(); //fin du groupe
> }
>
>
>
> };
>
> int main(void)
> {
>
> G_window = new Fl_Double_Window(500, 400);
> G_window->begin();
> Connector connect(10,10,150,40);
> G_window->end();
>
> G_window->show();
>
> Fl::run();
>
> return 0;
> }
>
>
>
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