On 03/26/12 01:08, leowang wrote:
> Dear All,
> I have a question of event handle. Suppose I have Window A,
> it has a sub-window named B, Window B has a Widget C in it.
> So my question is: if I return 0 in B::handle(event),
> the event will transfer to A or C?
Probably depends on the event type.
This is one you can probably answer yourself by making
an example to find out. This is what I did (below) to show
you how to find out yourself, in this case, using KEY events.
With keys, if C has focus, C will get first shot at it,
then B, then A. And if none respond, it gets resent as a shortcut
to the main window (A).
For instance, if I run the following program, when I hit 'z' I get:
Button C (KEY): z
Window B (KEY): z
Window A (KEY): z
Window A (SHORTCUT): z
Here's the test program:
#include <fltk/Window.h>
#include <fltk/Button.h>
#include <fltk/events.h>
#include <fltk/run.h>
class MyWindow : public fltk::Window {
public:
MyWindow(int W,int H,const char* L) : fltk::Window(W,H,L) {
}
MyWindow(int X,int Y,int W,int H,const char* L) : fltk::Window(X,Y,W,H,L) {
}
int handle(int e) {
if ( e == fltk::KEY && fltk::event_key() == 'z' ) {
printf("Window %s (KEY): z\n", label());
return(0);
}
if ( e == fltk::SHORTCUT && fltk::event_key() == 'z' ) {
printf("Window %s (SHORTCUT): z\n", label());
return(0);
}
return(fltk::Window::handle(e));
}
};
class MyButton : public fltk::Button {
public:
MyButton(int X,int Y,int W,int H,const char* L) : fltk::Button(X,Y,W,H,L) {
}
int handle(int e) {
if ( e == fltk::KEY && fltk::event_key() == 'z' ) {
printf("Button %s (KEY): z\n", label());
return(0);
}
if ( e == fltk::SHORTCUT && fltk::event_key() == 'z' ) {
printf("Button %s (SHORTCUT): z\n", label());
return(0);
}
return(fltk::Button::handle(e));
}
};
int main() {
MyWindow *a = new MyWindow(300, 180,"A");
a->begin();
MyWindow *b = new MyWindow(10,20,280,150,"B");
b->color(45);
b->begin();
MyButton *c = new MyButton(20,30,100,25,"C");
MyButton *d = new MyButton(20,70,100,25,"D");
c->take_focus();
b->end();
b->end();
a->show();
return fltk::run();
}
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