d271a51bfd
The :allow-long-swipes GObject property relies on the automatic getter/setter added by gjs and is not actually backed by _allowLongSwipes. Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1765>
792 lines
26 KiB
JavaScript
792 lines
26 KiB
JavaScript
// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
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/* exported SwipeTracker */
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const { Clutter, Gio, GObject, Meta } = imports.gi;
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const Main = imports.ui.main;
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const Params = imports.misc.params;
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// FIXME: ideally these values matches physical touchpad size. We can get the
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// correct values for gnome-shell specifically, since mutter uses libinput
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// directly, but GTK apps cannot get it, so use an arbitrary value so that
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// it's consistent with apps.
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const TOUCHPAD_BASE_HEIGHT = 300;
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const TOUCHPAD_BASE_WIDTH = 400;
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const EVENT_HISTORY_THRESHOLD_MS = 150;
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const SCROLL_MULTIPLIER = 10;
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const SWIPE_MULTIPLIER = 0.5;
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const MIN_ANIMATION_DURATION = 100;
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const MAX_ANIMATION_DURATION = 400;
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const VELOCITY_THRESHOLD_TOUCH = 0.3;
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const VELOCITY_THRESHOLD_TOUCHPAD = 0.6;
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const DECELERATION_TOUCH = 0.998;
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const DECELERATION_TOUCHPAD = 0.997;
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const VELOCITY_CURVE_THRESHOLD = 2;
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const DECELERATION_PARABOLA_MULTIPLIER = 0.35;
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const DRAG_THRESHOLD_DISTANCE = 16;
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// Derivative of easeOutCubic at t=0
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const DURATION_MULTIPLIER = 3;
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const ANIMATION_BASE_VELOCITY = 0.002;
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const EPSILON = 0.005;
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const GESTURE_FINGER_COUNT = 3;
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const State = {
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NONE: 0,
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SCROLLING: 1,
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};
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const TouchpadState = {
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NONE: 0,
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PENDING: 1,
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HANDLING: 2,
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IGNORED: 3,
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};
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const EventHistory = class {
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constructor() {
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this.reset();
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}
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reset() {
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this._data = [];
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}
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trim(time) {
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const thresholdTime = time - EVENT_HISTORY_THRESHOLD_MS;
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const index = this._data.findIndex(r => r.time >= thresholdTime);
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this._data.splice(0, index);
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}
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append(time, delta) {
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this.trim(time);
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this._data.push({ time, delta });
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}
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calculateVelocity() {
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if (this._data.length < 2)
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return 0;
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const firstTime = this._data[0].time;
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const lastTime = this._data[this._data.length - 1].time;
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if (firstTime === lastTime)
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return 0;
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const totalDelta = this._data.slice(1).map(a => a.delta).reduce((a, b) => a + b);
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const period = lastTime - firstTime;
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return totalDelta / period;
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}
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};
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const TouchpadSwipeGesture = GObject.registerClass({
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Properties: {
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'enabled': GObject.ParamSpec.boolean(
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'enabled', 'enabled', 'enabled',
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GObject.ParamFlags.READWRITE,
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true),
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'orientation': GObject.ParamSpec.enum(
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'orientation', 'orientation', 'orientation',
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GObject.ParamFlags.READWRITE,
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Clutter.Orientation, Clutter.Orientation.HORIZONTAL),
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},
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Signals: {
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'begin': { param_types: [GObject.TYPE_UINT, GObject.TYPE_DOUBLE, GObject.TYPE_DOUBLE] },
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'update': { param_types: [GObject.TYPE_UINT, GObject.TYPE_DOUBLE, GObject.TYPE_DOUBLE] },
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'end': { param_types: [GObject.TYPE_UINT, GObject.TYPE_DOUBLE] },
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},
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}, class TouchpadSwipeGesture extends GObject.Object {
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_init(allowedModes) {
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super._init();
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this._allowedModes = allowedModes;
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this._state = TouchpadState.NONE;
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this._cumulativeX = 0;
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this._cumulativeY = 0;
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this._touchpadSettings = new Gio.Settings({
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schema_id: 'org.gnome.desktop.peripherals.touchpad',
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});
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this._stageCaptureEvent =
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global.stage.connect('captured-event::touchpad', this._handleEvent.bind(this));
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}
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_handleEvent(actor, event) {
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if (event.type() !== Clutter.EventType.TOUCHPAD_SWIPE)
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return Clutter.EVENT_PROPAGATE;
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if (event.get_gesture_phase() === Clutter.TouchpadGesturePhase.BEGIN)
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this._state = TouchpadState.NONE;
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if (event.get_touchpad_gesture_finger_count() !== GESTURE_FINGER_COUNT)
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return Clutter.EVENT_PROPAGATE;
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if ((this._allowedModes & Main.actionMode) === 0)
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return Clutter.EVENT_PROPAGATE;
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if (!this.enabled)
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return Clutter.EVENT_PROPAGATE;
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if (this._state === TouchpadState.IGNORED)
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return Clutter.EVENT_PROPAGATE;
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let time = event.get_time();
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const [x, y] = event.get_coords();
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let [dx, dy] = event.get_gesture_motion_delta();
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if (this._state === TouchpadState.NONE) {
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if (dx === 0 && dy === 0)
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return Clutter.EVENT_PROPAGATE;
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this._cumulativeX = 0;
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this._cumulativeY = 0;
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this._state = TouchpadState.PENDING;
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}
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if (this._state === TouchpadState.PENDING) {
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this._cumulativeX += dx * SWIPE_MULTIPLIER;
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this._cumulativeY += dy * SWIPE_MULTIPLIER;
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const cdx = this._cumulativeX;
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const cdy = this._cumulativeY;
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const distance = Math.sqrt(cdx * cdx + cdy * cdy);
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if (distance >= DRAG_THRESHOLD_DISTANCE) {
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const gestureOrientation = Math.abs(cdx) > Math.abs(cdy)
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? Clutter.Orientation.HORIZONTAL
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: Clutter.Orientation.VERTICAL;
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this._cumulativeX = 0;
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this._cumulativeY = 0;
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if (gestureOrientation === this.orientation) {
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this._state = TouchpadState.HANDLING;
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this.emit('begin', time, x, y);
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} else {
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this._state = TouchpadState.IGNORED;
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return Clutter.EVENT_PROPAGATE;
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}
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} else {
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return Clutter.EVENT_PROPAGATE;
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}
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}
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const vertical = this.orientation === Clutter.Orientation.VERTICAL;
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let delta = (vertical ? dy : dx) * SWIPE_MULTIPLIER;
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const distance = vertical ? TOUCHPAD_BASE_HEIGHT : TOUCHPAD_BASE_WIDTH;
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switch (event.get_gesture_phase()) {
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case Clutter.TouchpadGesturePhase.BEGIN:
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case Clutter.TouchpadGesturePhase.UPDATE:
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if (this._touchpadSettings.get_boolean('natural-scroll'))
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delta = -delta;
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this.emit('update', time, delta, distance);
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break;
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case Clutter.TouchpadGesturePhase.END:
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case Clutter.TouchpadGesturePhase.CANCEL:
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this.emit('end', time, distance);
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this._state = TouchpadState.NONE;
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break;
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}
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return this._state === TouchpadState.HANDLING
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? Clutter.EVENT_STOP
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: Clutter.EVENT_PROPAGATE;
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}
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destroy() {
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if (this._stageCaptureEvent) {
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global.stage.disconnect(this._stageCaptureEvent);
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delete this._stageCaptureEvent;
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}
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}
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});
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const TouchSwipeGesture = GObject.registerClass({
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Properties: {
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'distance': GObject.ParamSpec.double(
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'distance', 'distance', 'distance',
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GObject.ParamFlags.READWRITE,
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0, Infinity, 0),
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'orientation': GObject.ParamSpec.enum(
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'orientation', 'orientation', 'orientation',
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GObject.ParamFlags.READWRITE,
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Clutter.Orientation, Clutter.Orientation.HORIZONTAL),
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},
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Signals: {
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'begin': { param_types: [GObject.TYPE_UINT, GObject.TYPE_DOUBLE, GObject.TYPE_DOUBLE] },
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'update': { param_types: [GObject.TYPE_UINT, GObject.TYPE_DOUBLE, GObject.TYPE_DOUBLE] },
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'end': { param_types: [GObject.TYPE_UINT, GObject.TYPE_DOUBLE] },
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'cancel': { param_types: [GObject.TYPE_UINT, GObject.TYPE_DOUBLE] },
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},
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}, class TouchSwipeGesture extends Clutter.GestureAction {
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_init(allowedModes, nTouchPoints, thresholdTriggerEdge) {
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super._init();
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this.set_n_touch_points(nTouchPoints);
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this.set_threshold_trigger_edge(thresholdTriggerEdge);
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this._allowedModes = allowedModes;
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this._distance = global.screen_height;
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global.display.connect('grab-op-begin', () => {
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this.cancel();
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});
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this._lastPosition = 0;
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}
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get distance() {
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return this._distance;
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}
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set distance(distance) {
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if (this._distance === distance)
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return;
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this._distance = distance;
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this.notify('distance');
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}
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vfunc_gesture_prepare(actor) {
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if (!super.vfunc_gesture_prepare(actor))
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return false;
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if ((this._allowedModes & Main.actionMode) === 0)
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return false;
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let time = this.get_last_event(0).get_time();
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let [xPress, yPress] = this.get_press_coords(0);
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let [x, y] = this.get_motion_coords(0);
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const [xDelta, yDelta] = [x - xPress, y - yPress];
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const swipeOrientation = Math.abs(xDelta) > Math.abs(yDelta)
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? Clutter.Orientation.HORIZONTAL : Clutter.Orientation.VERTICAL;
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if (swipeOrientation !== this.orientation)
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return false;
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this._lastPosition =
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this.orientation === Clutter.Orientation.VERTICAL ? y : x;
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this.emit('begin', time, xPress, yPress);
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return true;
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}
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vfunc_gesture_progress(_actor) {
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let [x, y] = this.get_motion_coords(0);
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let pos = this.orientation === Clutter.Orientation.VERTICAL ? y : x;
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let delta = pos - this._lastPosition;
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this._lastPosition = pos;
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let time = this.get_last_event(0).get_time();
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this.emit('update', time, -delta, this._distance);
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return true;
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}
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vfunc_gesture_end(_actor) {
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let time = this.get_last_event(0).get_time();
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this.emit('end', time, this._distance);
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}
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vfunc_gesture_cancel(_actor) {
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let time = Clutter.get_current_event_time();
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this.emit('cancel', time, this._distance);
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}
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});
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const ScrollGesture = GObject.registerClass({
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Properties: {
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'enabled': GObject.ParamSpec.boolean(
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'enabled', 'enabled', 'enabled',
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GObject.ParamFlags.READWRITE,
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true),
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'orientation': GObject.ParamSpec.enum(
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'orientation', 'orientation', 'orientation',
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GObject.ParamFlags.READWRITE,
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Clutter.Orientation, Clutter.Orientation.HORIZONTAL),
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'scroll-modifiers': GObject.ParamSpec.flags(
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'scroll-modifiers', 'scroll-modifiers', 'scroll-modifiers',
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GObject.ParamFlags.READWRITE,
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Clutter.ModifierType, 0),
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},
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Signals: {
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'begin': { param_types: [GObject.TYPE_UINT, GObject.TYPE_DOUBLE, GObject.TYPE_DOUBLE] },
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'update': { param_types: [GObject.TYPE_UINT, GObject.TYPE_DOUBLE, GObject.TYPE_DOUBLE] },
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'end': { param_types: [GObject.TYPE_UINT, GObject.TYPE_DOUBLE] },
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},
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}, class ScrollGesture extends GObject.Object {
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_init(actor, allowedModes) {
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super._init();
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this._allowedModes = allowedModes;
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this._began = false;
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this._enabled = true;
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actor.connect('scroll-event', this._handleEvent.bind(this));
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}
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get enabled() {
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return this._enabled;
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}
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set enabled(enabled) {
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if (this._enabled === enabled)
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return;
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this._enabled = enabled;
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this._began = false;
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this.notify('enabled');
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}
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canHandleEvent(event) {
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if (event.type() !== Clutter.EventType.SCROLL)
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return false;
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if (event.get_scroll_source() !== Clutter.ScrollSource.FINGER &&
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event.get_source_device().get_device_type() !== Clutter.InputDeviceType.TOUCHPAD_DEVICE)
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return false;
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if (!this.enabled)
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return false;
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if ((this._allowedModes & Main.actionMode) === 0)
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return false;
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if (this.scrollModifiers !== 0 &&
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(event.get_state() & this.scrollModifiers) === 0)
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return false;
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return true;
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}
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_handleEvent(actor, event) {
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if (!this.canHandleEvent(event))
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return Clutter.EVENT_PROPAGATE;
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if (event.get_scroll_direction() !== Clutter.ScrollDirection.SMOOTH)
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return Clutter.EVENT_PROPAGATE;
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const vertical = this.orientation === Clutter.Orientation.VERTICAL;
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const distance = vertical ? TOUCHPAD_BASE_HEIGHT : TOUCHPAD_BASE_WIDTH;
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let time = event.get_time();
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let [dx, dy] = event.get_scroll_delta();
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if (dx === 0 && dy === 0) {
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this.emit('end', time, distance);
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this._began = false;
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return Clutter.EVENT_STOP;
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}
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if (!this._began) {
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let [x, y] = event.get_coords();
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this.emit('begin', time, x, y);
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this._began = true;
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}
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const delta = (vertical ? dy : dx) * SCROLL_MULTIPLIER;
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this.emit('update', time, delta, distance);
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return Clutter.EVENT_STOP;
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}
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});
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// USAGE:
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//
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// To correctly implement the gesture, there must be handlers for the following
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// signals:
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//
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// begin(tracker, monitor)
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// The handler should check whether a deceleration animation is currently
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// running. If it is, it should stop the animation (without resetting
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// progress). Then it should call:
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// tracker.confirmSwipe(distance, snapPoints, currentProgress, cancelProgress)
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// If it's not called, the swipe would be ignored.
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// The parameters are:
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// * distance: the page size;
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// * snapPoints: an (sorted with ascending order) array of snap points;
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// * currentProgress: the current progress;
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// * cancelprogress: a non-transient value that would be used if the gesture
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// is cancelled.
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// If no animation was running, currentProgress and cancelProgress should be
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// same. The handler may set 'orientation' property here.
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//
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// update(tracker, progress)
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// The handler should set the progress to the given value.
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//
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// end(tracker, duration, endProgress)
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// The handler should animate the progress to endProgress. If endProgress is
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// 0, it should do nothing after the animation, otherwise it should change the
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// state, e.g. change the current page or switch workspace.
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// NOTE: duration can be 0 in some cases, in this case it should finish
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// instantly.
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/** A class for handling swipe gestures */
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var SwipeTracker = GObject.registerClass({
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Properties: {
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'enabled': GObject.ParamSpec.boolean(
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'enabled', 'enabled', 'enabled',
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GObject.ParamFlags.READWRITE,
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true),
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'orientation': GObject.ParamSpec.enum(
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'orientation', 'orientation', 'orientation',
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GObject.ParamFlags.READWRITE,
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Clutter.Orientation, Clutter.Orientation.HORIZONTAL),
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'distance': GObject.ParamSpec.double(
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'distance', 'distance', 'distance',
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GObject.ParamFlags.READWRITE,
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0, Infinity, 0),
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'allow-long-swipes': GObject.ParamSpec.boolean(
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'allow-long-swipes', 'allow-long-swipes', 'allow-long-swipes',
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GObject.ParamFlags.READWRITE,
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false),
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'scroll-modifiers': GObject.ParamSpec.flags(
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'scroll-modifiers', 'scroll-modifiers', 'scroll-modifiers',
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GObject.ParamFlags.READWRITE,
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Clutter.ModifierType, 0),
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},
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Signals: {
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'begin': { param_types: [GObject.TYPE_UINT] },
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'update': { param_types: [GObject.TYPE_DOUBLE] },
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'end': { param_types: [GObject.TYPE_UINT64, GObject.TYPE_DOUBLE] },
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},
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}, class SwipeTracker extends GObject.Object {
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_init(actor, orientation, allowedModes, params) {
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super._init();
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params = Params.parse(params, { allowDrag: true, allowScroll: true });
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this.orientation = orientation;
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this._allowedModes = allowedModes;
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this._enabled = true;
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this._distance = global.screen_height;
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this._history = new EventHistory();
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this._reset();
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this._touchpadGesture = new TouchpadSwipeGesture(allowedModes);
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this._touchpadGesture.connect('begin', this._beginGesture.bind(this));
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this._touchpadGesture.connect('update', this._updateGesture.bind(this));
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this._touchpadGesture.connect('end', this._endTouchpadGesture.bind(this));
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this.bind_property('enabled', this._touchpadGesture, 'enabled', 0);
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this.bind_property('orientation', this._touchpadGesture, 'orientation',
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GObject.BindingFlags.SYNC_CREATE);
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this._touchGesture = new TouchSwipeGesture(allowedModes,
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GESTURE_FINGER_COUNT,
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Clutter.GestureTriggerEdge.AFTER);
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this._touchGesture.connect('begin', this._beginTouchSwipe.bind(this));
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this._touchGesture.connect('update', this._updateGesture.bind(this));
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this._touchGesture.connect('end', this._endTouchGesture.bind(this));
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this._touchGesture.connect('cancel', this._cancelTouchGesture.bind(this));
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this.bind_property('enabled', this._touchGesture, 'enabled', 0);
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this.bind_property('orientation', this._touchGesture, 'orientation',
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GObject.BindingFlags.SYNC_CREATE);
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this.bind_property('distance', this._touchGesture, 'distance', 0);
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global.stage.add_action(this._touchGesture);
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if (params.allowDrag) {
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this._dragGesture = new TouchSwipeGesture(allowedModes, 1,
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Clutter.GestureTriggerEdge.AFTER);
|
|
this._dragGesture.connect('begin', this._beginGesture.bind(this));
|
|
this._dragGesture.connect('update', this._updateGesture.bind(this));
|
|
this._dragGesture.connect('end', this._endTouchGesture.bind(this));
|
|
this._dragGesture.connect('cancel', this._cancelTouchGesture.bind(this));
|
|
this.bind_property('enabled', this._dragGesture, 'enabled', 0);
|
|
this.bind_property('orientation', this._dragGesture, 'orientation',
|
|
GObject.BindingFlags.SYNC_CREATE);
|
|
this.bind_property('distance', this._dragGesture, 'distance', 0);
|
|
actor.add_action(this._dragGesture);
|
|
} else {
|
|
this._dragGesture = null;
|
|
}
|
|
|
|
if (params.allowScroll) {
|
|
this._scrollGesture = new ScrollGesture(actor, allowedModes);
|
|
this._scrollGesture.connect('begin', this._beginGesture.bind(this));
|
|
this._scrollGesture.connect('update', this._updateGesture.bind(this));
|
|
this._scrollGesture.connect('end', this._endTouchpadGesture.bind(this));
|
|
this.bind_property('enabled', this._scrollGesture, 'enabled', 0);
|
|
this.bind_property('orientation', this._scrollGesture, 'orientation',
|
|
GObject.BindingFlags.SYNC_CREATE);
|
|
this.bind_property('scroll-modifiers',
|
|
this._scrollGesture, 'scroll-modifiers', 0);
|
|
} else {
|
|
this._scrollGesture = null;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* canHandleScrollEvent:
|
|
* @param {Clutter.Event} scrollEvent: an event to check
|
|
* @returns {bool} whether the event can be handled by the tracker
|
|
*
|
|
* This function can be used to combine swipe gesture and mouse
|
|
* scrolling.
|
|
*/
|
|
canHandleScrollEvent(scrollEvent) {
|
|
if (!this.enabled || this._scrollGesture === null)
|
|
return false;
|
|
|
|
return this._scrollGesture.canHandleEvent(scrollEvent);
|
|
}
|
|
|
|
get enabled() {
|
|
return this._enabled;
|
|
}
|
|
|
|
set enabled(enabled) {
|
|
if (this._enabled === enabled)
|
|
return;
|
|
|
|
this._enabled = enabled;
|
|
if (!enabled && this._state === State.SCROLLING)
|
|
this._interrupt();
|
|
this.notify('enabled');
|
|
}
|
|
|
|
get distance() {
|
|
return this._distance;
|
|
}
|
|
|
|
set distance(distance) {
|
|
if (this._distance === distance)
|
|
return;
|
|
|
|
this._distance = distance;
|
|
this.notify('distance');
|
|
}
|
|
|
|
_reset() {
|
|
this._state = State.NONE;
|
|
|
|
this._snapPoints = [];
|
|
this._initialProgress = 0;
|
|
this._cancelProgress = 0;
|
|
|
|
this._prevOffset = 0;
|
|
this._progress = 0;
|
|
|
|
this._cancelled = false;
|
|
|
|
this._history.reset();
|
|
}
|
|
|
|
_interrupt() {
|
|
this.emit('end', 0, this._cancelProgress);
|
|
this._reset();
|
|
}
|
|
|
|
_beginTouchSwipe(gesture, time, x, y) {
|
|
if (this._dragGesture)
|
|
this._dragGesture.cancel();
|
|
|
|
this._beginGesture(gesture, time, x, y);
|
|
}
|
|
|
|
_beginGesture(gesture, time, x, y) {
|
|
if (this._state === State.SCROLLING)
|
|
return;
|
|
|
|
this._history.append(time, 0);
|
|
|
|
let rect = new Meta.Rectangle({ x, y, width: 1, height: 1 });
|
|
let monitor = global.display.get_monitor_index_for_rect(rect);
|
|
|
|
this.emit('begin', monitor);
|
|
}
|
|
|
|
_findClosestPoint(pos) {
|
|
const distances = this._snapPoints.map(x => Math.abs(x - pos));
|
|
const min = Math.min(...distances);
|
|
return distances.indexOf(min);
|
|
}
|
|
|
|
_findNextPoint(pos) {
|
|
return this._snapPoints.findIndex(p => p >= pos);
|
|
}
|
|
|
|
_findPreviousPoint(pos) {
|
|
const reversedIndex = this._snapPoints.slice().reverse().findIndex(p => p <= pos);
|
|
return this._snapPoints.length - 1 - reversedIndex;
|
|
}
|
|
|
|
_findPointForProjection(pos, velocity) {
|
|
const initial = this._findClosestPoint(this._initialProgress);
|
|
const prev = this._findPreviousPoint(pos);
|
|
const next = this._findNextPoint(pos);
|
|
|
|
if ((velocity > 0 ? prev : next) === initial)
|
|
return velocity > 0 ? next : prev;
|
|
|
|
return this._findClosestPoint(pos);
|
|
}
|
|
|
|
_getBounds(pos) {
|
|
if (this.allowLongSwipes)
|
|
return [this._snapPoints[0], this._snapPoints[this._snapPoints.length - 1]];
|
|
|
|
const closest = this._findClosestPoint(pos);
|
|
|
|
let prev, next;
|
|
if (Math.abs(this._snapPoints[closest] - pos) < EPSILON) {
|
|
prev = next = closest;
|
|
} else {
|
|
prev = this._findPreviousPoint(pos);
|
|
next = this._findNextPoint(pos);
|
|
}
|
|
|
|
const lowerIndex = Math.max(prev - 1, 0);
|
|
const upperIndex = Math.min(next + 1, this._snapPoints.length - 1);
|
|
|
|
return [this._snapPoints[lowerIndex], this._snapPoints[upperIndex]];
|
|
}
|
|
|
|
_updateGesture(gesture, time, delta, distance) {
|
|
if (this._state !== State.SCROLLING)
|
|
return;
|
|
|
|
if ((this._allowedModes & Main.actionMode) === 0 || !this.enabled) {
|
|
this._interrupt();
|
|
return;
|
|
}
|
|
|
|
if (this.orientation === Clutter.Orientation.HORIZONTAL &&
|
|
Clutter.get_default_text_direction() === Clutter.TextDirection.RTL)
|
|
delta = -delta;
|
|
|
|
this._progress += delta / distance;
|
|
this._history.append(time, delta);
|
|
|
|
this._progress = Math.clamp(this._progress, ...this._getBounds(this._initialProgress));
|
|
|
|
this.emit('update', this._progress);
|
|
}
|
|
|
|
_getEndProgress(velocity, distance, isTouchpad) {
|
|
if (this._cancelled)
|
|
return this._cancelProgress;
|
|
|
|
const threshold = isTouchpad ? VELOCITY_THRESHOLD_TOUCHPAD : VELOCITY_THRESHOLD_TOUCH;
|
|
|
|
if (Math.abs(velocity) < threshold)
|
|
return this._snapPoints[this._findClosestPoint(this._progress)];
|
|
|
|
const decel = isTouchpad ? DECELERATION_TOUCHPAD : DECELERATION_TOUCH;
|
|
const slope = decel / (1.0 - decel) / 1000.0;
|
|
|
|
let pos;
|
|
if (Math.abs(velocity) > VELOCITY_CURVE_THRESHOLD) {
|
|
const c = slope / 2 / DECELERATION_PARABOLA_MULTIPLIER;
|
|
const x = Math.abs(velocity) - VELOCITY_CURVE_THRESHOLD + c;
|
|
|
|
pos = slope * VELOCITY_CURVE_THRESHOLD +
|
|
DECELERATION_PARABOLA_MULTIPLIER * x * x -
|
|
DECELERATION_PARABOLA_MULTIPLIER * c * c;
|
|
} else {
|
|
pos = Math.abs(velocity) * slope;
|
|
}
|
|
|
|
pos = pos * Math.sign(velocity) + this._progress;
|
|
pos = Math.clamp(pos, ...this._getBounds(this._initialProgress));
|
|
|
|
const index = this._findPointForProjection(pos, velocity);
|
|
|
|
return this._snapPoints[index];
|
|
}
|
|
|
|
_endTouchGesture(_gesture, time, distance) {
|
|
this._endGesture(time, distance, false);
|
|
}
|
|
|
|
_endTouchpadGesture(_gesture, time, distance) {
|
|
this._endGesture(time, distance, true);
|
|
}
|
|
|
|
_endGesture(time, distance, isTouchpad) {
|
|
if (this._state !== State.SCROLLING)
|
|
return;
|
|
|
|
if ((this._allowedModes & Main.actionMode) === 0 || !this.enabled) {
|
|
this._interrupt();
|
|
return;
|
|
}
|
|
|
|
this._history.trim(time);
|
|
|
|
let velocity = this._history.calculateVelocity();
|
|
const endProgress = this._getEndProgress(velocity, distance, isTouchpad);
|
|
|
|
velocity /= distance;
|
|
|
|
if ((endProgress - this._progress) * velocity <= 0)
|
|
velocity = ANIMATION_BASE_VELOCITY;
|
|
|
|
const nPoints = Math.max(1, Math.ceil(Math.abs(this._progress - endProgress)));
|
|
const maxDuration = MAX_ANIMATION_DURATION * Math.log2(1 + nPoints);
|
|
|
|
let duration = Math.abs((this._progress - endProgress) / velocity * DURATION_MULTIPLIER);
|
|
if (duration > 0)
|
|
duration = Math.clamp(duration, MIN_ANIMATION_DURATION, maxDuration);
|
|
|
|
this._reset();
|
|
this.emit('end', duration, endProgress);
|
|
}
|
|
|
|
_cancelTouchGesture(_gesture, time, distance) {
|
|
if (this._state !== State.SCROLLING)
|
|
return;
|
|
|
|
this._cancelled = true;
|
|
this._endGesture(time, distance, false);
|
|
}
|
|
|
|
/**
|
|
* confirmSwipe:
|
|
* @param {number} distance: swipe distance in pixels
|
|
* @param {number[]} snapPoints:
|
|
* An array of snap points, sorted in ascending order
|
|
* @param {number} currentProgress: initial progress value
|
|
* @param {number} cancelProgress: the value to be used on cancelling
|
|
*
|
|
* Confirms a swipe. User has to call this in 'begin' signal handler,
|
|
* otherwise the swipe wouldn't start. If there's an animation running,
|
|
* it should be stopped first.
|
|
*
|
|
* @cancel_progress must always be a snap point, or a value matching
|
|
* some other non-transient state.
|
|
*/
|
|
confirmSwipe(distance, snapPoints, currentProgress, cancelProgress) {
|
|
this.distance = distance;
|
|
this._snapPoints = snapPoints;
|
|
this._initialProgress = currentProgress;
|
|
this._progress = currentProgress;
|
|
this._cancelProgress = cancelProgress;
|
|
|
|
this._state = State.SCROLLING;
|
|
}
|
|
|
|
destroy() {
|
|
if (this._touchpadGesture) {
|
|
this._touchpadGesture.destroy();
|
|
delete this._touchpadGesture;
|
|
}
|
|
|
|
if (this._touchGesture) {
|
|
global.stage.remove_action(this._touchGesture);
|
|
delete this._touchGesture;
|
|
}
|
|
}
|
|
});
|