131 lines
3.7 KiB
JavaScript
131 lines
3.7 KiB
JavaScript
// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
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const Clutter = imports.gi.Clutter;
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const Lang = imports.lang;
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const Meta = imports.gi.Meta;
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const Shell = imports.gi.Shell;
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function clampAbs(v, cap) {
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if (v > cap)
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v = cap;
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if (v < -cap)
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v = -cap;
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return v;
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}
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const ActorWobbler = new Lang.Class({
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Name: 'ActorWobbler',
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_init: function(actor) {
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this._actor = actor;
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this._effect = new Shell.WobblyEffect();
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this._actor.add_effect(this._effect);
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this._actor._wobbler = this;
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this._currentBend = 0;
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this._currentHeightOffset = 0;
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this._running = false;
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this._allocationChangedId = this._actor.connect('allocation-changed', Lang.bind(this, this._allocationChanged));
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this._timeline = new Clutter.Timeline({ duration: 100, repeat_count: -1 });
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this._timeline.connect('new-frame', Lang.bind(this, this._newFrame));
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this._timeline.start();
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},
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start: function() {
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this._running = true;
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},
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stop: function() {
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this._running = false;
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},
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_destroy: function() {
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this._timeline.run_dispose();
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this._timeline = null;
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this._actor.disconnect(this._allocationChangedId);
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this._actor.scale_y = 1.0;
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this._actor.remove_effect(this._effect);
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this._actor._wobbler = null;
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},
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_newFrame: function() {
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this._step();
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},
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_step: function() {
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const DAMPEN = 0.8;
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this._currentBend *= DAMPEN;
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if (Math.abs(this._currentBend) < 1)
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this._currentBend = 0;
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this._currentHeightOffset *= DAMPEN;
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if (Math.abs(this._currentHeightOffset) < 1)
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this._currentHeightOffset = 0;
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// Cap the bend to a 100px shift.
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const BEND_CAP = 50;
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this._currentBend = clampAbs(this._currentBend, BEND_CAP);
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this._effect.set_bend_x(this._currentBend);
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// Cap the height change to 25px in either direction.
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const HEIGHT_OFFSET_CAP = 25;
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this._currentHeightOffset = clampAbs(this._currentHeightOffset, HEIGHT_OFFSET_CAP);
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let [minHeight, natHeight] = this._actor.get_preferred_height(-1);
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let scale = (natHeight + this._currentHeightOffset) / natHeight;
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this._actor.scale_y = scale;
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if (!this._running && this._currentBend == 0 && this._currentHeightOffset == 0)
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this._destroy();
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},
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_allocationChanged: function(actor, box, flags) {
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if (!this._running)
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return;
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if (this._oldX) {
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let deltaX = box.x1 - this._oldX;
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// Every 2px the user moves the window, we bend it by 1px.
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this._currentBend -= deltaX / 2;
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}
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if (this._oldY) {
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let deltaY = box.y1 - this._oldY;
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// Every 2px the user moves the window, we scale it by 1px.
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this._currentHeightOffset -= deltaY / 2;
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}
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this._oldX = box.x1;
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this._oldY = box.y1;
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},
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});
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const WobblyWindowManager = new Lang.Class({
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Name: 'WobblyWindowManager',
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_init: function() {
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global.display.connect('grab-op-begin', Lang.bind(this, this._grabOpBegin));
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global.display.connect('grab-op-end', Lang.bind(this, this._grabOpEnd));
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},
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_grabOpBegin: function(display, screen, window, op) {
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if (op != Meta.GrabOp.MOVING)
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return;
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let actor = window.get_compositor_private();
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if (!actor._wobbler)
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new ActorWobbler(actor);
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actor._wobbler.start();
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},
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_grabOpEnd: function(display, screen, window, op) {
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if (!window)
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return;
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let actor = window.get_compositor_private();
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if (actor._wobbler)
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actor._wobbler.stop();
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},
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});
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