void Slider::press(const Event& e) {
EventButton b = e.pointer_button();
if (b == Event::right) {
return;
}
SliderImpl& s = *impl_;
Coord x = e.pointer_x();
Coord y = e.pointer_y();
const Allocation& slider = allocation();
const Allocation& a = s.thumb_patch_->allocation();
int rel = s.hit_thumb(e);
if (rel == 0) {
apply_adjustment(&Adjustable::begin_adjustment);
s.xoffset_ = slider.left() + x - a.left();
s.yoffset_ = slider.bottom() + y - a.bottom();
s.dragging_ = true;
} else if (b == Event::left) {
s.stepper_ = (rel == 1) ? s.forward_ : s.backward_;
if (s.stepper_ != nil) {
s.stepper_->start_stepping();
}
} else {
/* middle ==> drag */
apply_adjustment(&Adjustable::begin_adjustment);
s.dragging_ = true;
s.xoffset_ = slider.left() + (a.right() - a.left()) / 2.0;
s.yoffset_ = slider.bottom() + (a.top() - a.bottom()) / 2.0;
move_to(x - s.xoffset_, y - s.yoffset_);
move(e);
}
}
void Slider::release(const Event& e) {
SliderImpl& s = *impl_;
if (s.dragging_) {
if (s.showing_old_thumb_) {
s.showing_old_thumb_ = false;
s.old_thumb_->redraw();
}
s.dragging_ = false;
if (s.aborted_) {
s.aborted_ = false;
return;
}
move_to(e.pointer_x() - s.xoffset_, e.pointer_y() - s.yoffset_);
redraw_thumb();
move(e);
apply_adjustment(&Adjustable::commit_adjustment);
} else if (s.stepper_ != nil) {
s.stepper_->stop_stepping();
s.stepper_ = nil;
move(e);
}
}
void Slider::release(const Event& e) {
SliderImpl& s = *impl_;
if (s.dragging_) {
if (s.showing_old_thumb_) {
s.showing_old_thumb_ = false;
s.old_thumb_->redraw();
}
s.dragging_ = false;
if (s.aborted_) {
s.aborted_ = false;
return;
}
Coord x, y;
s.get_position(this, e, x, y);
move_to(x - s.xoffset_, y - s.yoffset_);
redraw_thumb();
move(e);
apply_adjustment(&Adjustable::commit_adjustment);
} else if (s.stepper_ != nil) {
s.stepper_->stop_stepping();
s.stepper_ = nil;
move(e);
}
}
