Hi,
Just wanted to point to some sort of discrepancy with Fl::event_inside(const
Fl_Widget*) I recently noticed.
I was using it from within a handle() of a class derived from Fl_Window and
found, that it didn't work as expected.
Either there is some discrepancy between the coordinate system
Fl::event_inside() uses with the Fl::event_x()/y() coordinate system uses.
Or it is simply never meant to be used for container type widgets, which means
the documentation should be made clearer in this aspect.
I have made a small source example for this case:
--- snip ---
#include <FL/Fl_Window.H>
#include <FL/Fl.H>
#include <stdio.h>
// The way Fl::event_inside() should be implemeted?
static int event_inside(const Fl_Widget *o) /*const*/ {
int mx = /*e_x*/Fl::event_x(); // no access to e_x
int my = /*e_y*/Fl::event_y(); // no access to e_y
if (o->type() < FL_WINDOW) {
mx -= o->x();
my -= o->y();
}
return (mx >= 0 && mx < o->w() && my >= 0 && my < o->h());
}
// just for making debug output more readable...
static const char* colorname(Fl_Color c)
{Now I have made a small demo class, that shoes what i mean.
switch (c)
{
case FL_GREEN:
return "GREEN";
case FL_RED:
return "RED";
default:
return "unknown";
}
}
class SubWin : public Fl_Window
{
public:
SubWin( int x_, int y_, int w_, int h_ ) :
Fl_Window( x_, y_, w_, h_ )
{
}
virtual int handle( int e_ )
{
switch ( e_ )
{
case FL_PUSH:
printf( "FL_PUSH %p: x=%d y=%d Fl::event_x()=%d Fl::event_y()=%d\n",
this, x(), y(), Fl::event_x(), Fl::event_y() );
if ( Fl::event_inside( this ) )
{
// doesn't work if you push in the top/left areas of the subwins
// because Fl_event_x/y() counts coordinates relative to subwin,
// wheras Fl::event_inside() uses coordinates relative to parent
window.
printf( "Fl::event_inside(): pushed inside %s canvas (%p)\n",
colorname(color()), this );
}
if ( /*Fl::*/event_inside( this ) )
{
// works as expected
printf( "event_inside(): pushed inside %s canvas (%p)\n",
colorname(color()), this );
}
break;
case FL_RELEASE:
printf("\n");
break;
}
return Fl_Window::handle( e_ );
}
};
int main( int argc_, const char *argv_[] )
{
Fl_Window win( 640, 480, "event_inside TEST" );
SubWin subwin( 100, 100, 300, 200 );
subwin.color( FL_GREEN );
SubWin subwin2( 30, 30, 100, 100 );
subwin2.color( FL_RED );
subwin2.end();
win.show();
return Fl::run();
}
--- snip ---
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