67 lines
2.0 KiB
JavaScript
67 lines
2.0 KiB
JavaScript
// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
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const Signals = imports.signals;
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const Lang = imports.lang;
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const Meta = imports.gi.Meta;
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const Clutter = imports.gi.Clutter;
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const ShowOverviewAction = new Lang.Class({
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Name: 'ShowOverviewAction',
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Extends: Clutter.GestureAction,
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_init : function() {
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this.parent();
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this.set_n_touch_points (3);
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global.display.connect('grab-op-begin', Lang.bind(this, this.cancel));
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global.display.connect('grab-op-end', Lang.bind(this, this.cancel));
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},
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vfunc_gesture_prepare : function(action, actor) {
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return this.get_n_current_points() == this.get_n_touch_points();
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},
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_getBoundingRect : function(motion) {
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let minX, minY, maxX, maxY;
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for (let i = 0; i < this.get_n_current_points(); i++) {
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let x, y;
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if (motion == true) {
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[x, y] = this.get_motion_coords(i);
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} else {
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[x, y] = this.get_press_coords(i);
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}
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if (i == 0) {
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minX = maxX = x;
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minY = maxY = y;
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} else {
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minX = Math.min(minX, x);
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minY = Math.min(minY, y);
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maxX = Math.max(maxX, x);
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maxY = Math.max(maxY, y);
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}
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}
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return new Meta.Rectangle({ x: minX,
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y: minY,
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width: maxX - minX,
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height: maxY - minY });
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},
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vfunc_gesture_begin : function(action, actor) {
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this._initialRect = this._getBoundingRect(false);
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return true;
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},
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vfunc_gesture_end : function(action, actor) {
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let rect = this._getBoundingRect(true);
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let oldArea = this._initialRect.width * this._initialRect.height;
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let newArea = rect.width * rect.height;
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let areaDiff = newArea / oldArea;
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this.emit('activated', areaDiff);
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}
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});
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Signals.addSignalMethods(ShowOverviewAction.prototype);
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