6970f43e66
Throwing an exception stops execution of the current function, so the following return statements are both unnecessary and unreachable. Spotted by eslint. https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/606
94 lines
3.9 KiB
JavaScript
94 lines
3.9 KiB
JavaScript
// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
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const { Clutter, St } = imports.gi;
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const Tweener = imports.ui.tweener;
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// Shamelessly copied from the layout "hotcorner" ripples implementation
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var Ripples = class Ripples {
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constructor(px, py, styleClass) {
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this._x = 0;
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this._y = 0;
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this._px = px;
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this._py = py;
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this._ripple1 = new St.BoxLayout({ style_class: styleClass,
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opacity: 0,
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can_focus: false,
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reactive: false,
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visible: false });
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this._ripple1.set_pivot_point(px, py);
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this._ripple2 = new St.BoxLayout({ style_class: styleClass,
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opacity: 0,
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can_focus: false,
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reactive: false,
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visible: false });
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this._ripple2.set_pivot_point(px, py);
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this._ripple3 = new St.BoxLayout({ style_class: styleClass,
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opacity: 0,
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can_focus: false,
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reactive: false,
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visible: false });
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this._ripple3.set_pivot_point(px, py);
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}
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_animRipple(ripple, delay, time, startScale, startOpacity, finalScale) {
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// We draw a ripple by using a source image and animating it scaling
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// outwards and fading away. We want the ripples to move linearly
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// or it looks unrealistic, but if the opacity of the ripple goes
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// linearly to zero it fades away too quickly, so we use Tweener's
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// 'onUpdate' to give a non-linear curve to the fade-away and make
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// it more visible in the middle section.
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ripple.x = this._x;
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ripple.y = this._y;
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ripple._opacity = startOpacity;
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ripple.visible = true;
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ripple.opacity = 255 * Math.sqrt(startOpacity);
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ripple.scale_x = ripple.scale_y = startScale;
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ripple.set_translation( - this._px * ripple.width, - this._py * ripple.height, 0.0);
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Tweener.addTween(ripple, { _opacity: 0,
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scale_x: finalScale,
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scale_y: finalScale,
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delay: delay,
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time: time,
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transition: 'linear',
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onUpdate() { ripple.opacity = 255 * Math.sqrt(ripple._opacity); },
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onComplete() { ripple.visible = false; } });
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}
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addTo(stage) {
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if (this._stage !== undefined)
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throw new Error('Ripples already added');
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this._stage = stage;
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this._stage.add_actor(this._ripple1);
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this._stage.add_actor(this._ripple2);
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this._stage.add_actor(this._ripple3);
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}
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playAnimation(x, y) {
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if (this._stage === undefined)
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throw new Error('Ripples not added');
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this._x = x;
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this._y = y;
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this._stage.set_child_above_sibling(this._ripple1, null);
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this._stage.set_child_above_sibling(this._ripple2, this._ripple1);
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this._stage.set_child_above_sibling(this._ripple3, this._ripple2);
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// Show three concentric ripples expanding outwards; the exact
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// parameters were found by trial and error, so don't look
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// for them to make perfect sense mathematically
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// delay time scale opacity => scale
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this._animRipple(this._ripple1, 0.0, 0.83, 0.25, 1.0, 1.5);
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this._animRipple(this._ripple2, 0.05, 1.0, 0.0, 0.7, 1.25);
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this._animRipple(this._ripple3, 0.35, 1.0, 0.0, 0.3, 1);
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}
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};
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