Method showPreview

stackoverlay.js:357–413

* Shows the window preview in from the side it was triggered on.

()

     * Shows the window preview in from the side it was triggered on.
     */
    showPreview() {
        // only show if have valid scale
        const scale = Settings.prefs.edge_preview_scale;
        if (scale <= 0) {
            return;
        }

        // don't show if window grabbed
        if (Grab.grabbed) {
            return;
        }

        /**
         * if timeout is enabled, only show if valid timeout (e.g. if SHOW_DELAY <= timeout,
         * then won't see the preview anyway).
         */
        if (Settings.prefs.edge_preview_timeout_enable &&
            Settings.prefs.edge_preview_timeout <= this.SHOW_DELAY
        ) {
            return;
        }

        let [x, y] = global.get_pointer();
        const actor = this.target.get_compositor_private();
        const clone = new Clutter.Clone({ source: actor });
        this.clone = clone;

        // Remove any window clips, and show the metaWindow.clone's
        actor.remove_clip();
        Tiling.animateWindow(this.target);

        // set clone parameters
        clone.opacity = 255 * 0.95;

        clone.set_scale(scale, scale);
        Main.uiGroup.add_child(clone);

        const monitor = this.monitor;
        const scaleWidth = scale * clone.width;
        const scaleHeight = scale * clone.height;
        if (this._direction === Meta.MotionDirection.RIGHT) {
            x = monitor.x + monitor.width - scaleWidth;
        }
        else {
            x = monitor.x;
        }

        // calculate y position - center of mouse
        y -= (scale * clone.height) / 2;

        // bound to remain within view
        const workArea = this.getWorkArea();
        y = Math.max(y, workArea.y);
        y = Math.min(y, workArea.y + workArea.height - scaleHeight);

        clone.set_position(x, y);
    }