static int
pointer_event(glw_t *w, const glw_pointer_event_t *gpe)
{
glw_root_t *gr = w->glw_root;
glw_slider_t *s = (glw_slider_t *)w;
int hitpos = 0;
float v0 = w->glw_class == &glw_slider_x ? gpe->x : -gpe->y;
float v = 0;
float knob_pos;
float knob_size = (float)s->knob_size_px / s->slider_size_px;
int how = PROP_SET_NORMAL;
if(w->glw_class == &glw_slider_x) {
knob_pos = -1 + 2.0 * (float)s->knob_pos_px / s->slider_size_px;
} else {
knob_pos = 1 - 2.0 * (float)s->knob_pos_px / s->slider_size_px;
}
if(v0 < knob_pos - knob_size)
hitpos = -1;
else if(v0 > knob_pos + knob_size)
hitpos = 1;
switch(gpe->type) {
case GLW_POINTER_LEFT_PRESS:
if(w->glw_flags2 & GLW2_ALWAYS_GRAB_KNOB) {
v = GLW_RESCALE(v0 + s->grab_delta,
-1.0 + knob_size, 1.0 - knob_size);
gr->gr_pointer_grab = w;
} else if(hitpos == 0) {
s->grab_delta = knob_pos - v0;
gr->gr_pointer_grab = w;
v = s->value;
} else {
update_value_delta(s, hitpos * knob_size);
return 0;
}
how = PROP_SET_TENTATIVE;
break;
case GLW_POINTER_FOCUS_MOTION:
if(knob_size == 1.0)
break;
v = GLW_RESCALE(v0 + s->grab_delta,
-1.0 + knob_size, 1.0 - knob_size);
how = PROP_SET_TENTATIVE;
break;
case GLW_POINTER_LEFT_RELEASE:
v = s->value;
how = PROP_SET_COMMIT;
break;
default:
return 0;
}
update_value(s, v, how);
return 0;
}
static int
glw_slider_event_x(glw_t *w, event_t *e)
{
glw_slider_t *s = (glw_slider_t *)w;
float d;
if(event_is_action(e, ACTION_LEFT)) {
d = -s->step_i;
} else if(event_is_action(e, ACTION_RIGHT)) {
d = s->step_i;
} else {
return 0;
}
update_value_delta(s, d);
return 1;
}
static int
glw_slider_event_y(glw_t *w, event_t *e)
{
glw_slider_t *s = (glw_slider_t *)w;
float d;
if(event_is_action(e, ACTION_UP)) {
d = -s->step;
} else if(event_is_action(e, ACTION_DOWN)) {
d = s->step;
} else {
return 0;
}
update_value_delta(s, d);
return 1;
}
