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slider: Emit a 'drag-begin' signal when starting to drag

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We are already emitting a 'drag-end' signal when no more dragging
is happening, so it makes sense to emit a 'drag-begin' too when
starting, so that apps interested in implementing different logic
between those two events can easily do it without needing to deal
with the underlying 'button-press-event' signal for the actor.

https://bugzilla.gnome.org/show_bug.cgi?id=761208
This commit is contained in:
Mario Sanchez Prada 2016-01-27 22:35:11 +00:00 committed by Mario Sanchez Prada
parent 346ffd14d7
commit 779b1ae8e5
1 changed files with 5 additions and 0 deletions
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5
js/ui/slider.js
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@ -137,6 +137,10 @@ const Slider = new Lang.Class({
this._motionId = this.actor.connect('motion-event', Lang.bind(this, this._motionEvent));
}
// We need to emit 'drag-begin' before moving the handle to make
// sure that no 'value-changed' signal is emitted before this one.
this.emit('drag-begin');
let absX, absY;
[absX, absY] = event.get_coords();
this._moveHandle(absX, absY);
@ -224,6 +228,7 @@ const Slider = new Lang.Class({
let delta = key == Clutter.KEY_Right ? 0.1 : -0.1;
this._value = Math.max(0, Math.min(this._value + delta, 1));
this.actor.queue_repaint();
this.emit('drag-begin');
this.emit('value-changed', this._value);
this.emit('drag-end');
return Clutter.EVENT_STOP;