fa2ddcc52f
The picked target actor may be destroyed (e.g. hover style change
resulting in the ClutterTexture to be destroyed). If we don't handle
this, GJS will abort when it sees the exception caused by Javascript
code trying to access the destroyed target actor.
To handle it, listen on the 'destroy' signal on the target actor, and
repick, so a valid actor is passed to the next motion callback.
Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/issues/632
(cherry picked from commit 4259676f6e)
704 lines
26 KiB
JavaScript
704 lines
26 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 GLib = imports.gi.GLib;
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const Gtk = imports.gi.Gtk;
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const St = imports.gi.St;
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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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const Signals = imports.signals;
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const Tweener = imports.ui.tweener;
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const Main = imports.ui.main;
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const Params = imports.misc.params;
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// Time to scale down to maxDragActorSize
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var SCALE_ANIMATION_TIME = 0.25;
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// Time to animate to original position on cancel
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var SNAP_BACK_ANIMATION_TIME = 0.25;
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// Time to animate to original position on success
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var REVERT_ANIMATION_TIME = 0.75;
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var DragMotionResult = {
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NO_DROP: 0,
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COPY_DROP: 1,
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MOVE_DROP: 2,
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CONTINUE: 3
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};
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var DRAG_CURSOR_MAP = {
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0: Meta.Cursor.DND_UNSUPPORTED_TARGET,
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1: Meta.Cursor.DND_COPY,
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2: Meta.Cursor.DND_MOVE
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};
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var DragDropResult = {
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FAILURE: 0,
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SUCCESS: 1,
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CONTINUE: 2
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};
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var dragMonitors = [];
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let eventHandlerActor = null;
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let currentDraggable = null;
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function _getEventHandlerActor() {
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if (!eventHandlerActor) {
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eventHandlerActor = new Clutter.Actor({ width: 0, height: 0 });
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Main.uiGroup.add_actor(eventHandlerActor);
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// We connect to 'event' rather than 'captured-event' because the capturing phase doesn't happen
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// when you've grabbed the pointer.
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eventHandlerActor.connect('event', (actor, event) => {
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return currentDraggable._onEvent(actor, event);
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});
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}
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return eventHandlerActor;
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}
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function addDragMonitor(monitor) {
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dragMonitors.push(monitor);
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}
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function removeDragMonitor(monitor) {
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for (let i = 0; i < dragMonitors.length; i++)
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if (dragMonitors[i] == monitor) {
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dragMonitors.splice(i, 1);
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return;
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}
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}
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var _Draggable = new Lang.Class({
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Name: 'Draggable',
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_init(actor, params) {
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params = Params.parse(params, { manualMode: false,
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restoreOnSuccess: false,
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dragActorMaxSize: undefined,
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dragActorOpacity: undefined });
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this.actor = actor;
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if (!params.manualMode) {
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this.actor.connect('button-press-event',
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this._onButtonPress.bind(this));
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this.actor.connect('touch-event',
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this._onTouchEvent.bind(this));
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}
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this.actor.connect('destroy', () => {
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this._actorDestroyed = true;
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if (this._dragInProgress && this._dragCancellable)
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this._cancelDrag(global.get_current_time());
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this.disconnectAll();
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});
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this._onEventId = null;
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this._touchSequence = null;
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this._restoreOnSuccess = params.restoreOnSuccess;
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this._dragActorMaxSize = params.dragActorMaxSize;
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this._dragActorOpacity = params.dragActorOpacity;
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this._buttonDown = false; // The mouse button has been pressed and has not yet been released.
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this._dragInProgress = false; // The drag has been started, and has not been dropped or cancelled yet.
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this._animationInProgress = false; // The drag is over and the item is in the process of animating to its original position (snapping back or reverting).
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this._dragCancellable = true;
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this._eventsGrabbed = false;
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},
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_onButtonPress(actor, event) {
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if (event.get_button() != 1)
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return Clutter.EVENT_PROPAGATE;
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if (Tweener.getTweenCount(actor))
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return Clutter.EVENT_PROPAGATE;
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this._buttonDown = true;
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this._grabActor();
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let [stageX, stageY] = event.get_coords();
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this._dragStartX = stageX;
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this._dragStartY = stageY;
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return Clutter.EVENT_PROPAGATE;
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},
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_onTouchEvent(actor, event) {
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if (event.type() != Clutter.EventType.TOUCH_BEGIN ||
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!global.display.is_pointer_emulating_sequence(event.get_event_sequence()))
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return Clutter.EVENT_PROPAGATE;
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if (Tweener.getTweenCount(actor))
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return Clutter.EVENT_PROPAGATE;
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this._touchSequence = event.get_event_sequence();
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this._buttonDown = true;
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this._grabActor();
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let [stageX, stageY] = event.get_coords();
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this._dragStartX = stageX;
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this._dragStartY = stageY;
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return Clutter.EVENT_PROPAGATE;
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},
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_grabDevice(actor) {
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let manager = Clutter.DeviceManager.get_default();
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let pointer = manager.get_core_device(Clutter.InputDeviceType.POINTER_DEVICE);
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if (pointer && this._touchSequence)
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pointer.sequence_grab(this._touchSequence, actor);
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else if (pointer)
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pointer.grab (actor);
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this._grabbedDevice = pointer;
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},
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_ungrabDevice() {
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if (this._touchSequence)
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this._grabbedDevice.sequence_ungrab (this._touchSequence);
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else
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this._grabbedDevice.ungrab();
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this._touchSequence = null;
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this._grabbedDevice = null;
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},
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_grabActor() {
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this._grabDevice(this.actor);
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this._onEventId = this.actor.connect('event',
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this._onEvent.bind(this));
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},
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_ungrabActor() {
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if (!this._onEventId)
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return;
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this._ungrabDevice();
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this.actor.disconnect(this._onEventId);
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this._onEventId = null;
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},
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_grabEvents() {
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if (!this._eventsGrabbed) {
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this._eventsGrabbed = Main.pushModal(_getEventHandlerActor());
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if (this._eventsGrabbed)
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this._grabDevice(_getEventHandlerActor());
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}
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},
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_ungrabEvents() {
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if (this._eventsGrabbed) {
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this._ungrabDevice();
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Main.popModal(_getEventHandlerActor());
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this._eventsGrabbed = false;
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}
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},
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_onEvent(actor, event) {
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// We intercept BUTTON_RELEASE event to know that the button was released in case we
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// didn't start the drag, to drop the draggable in case the drag was in progress, and
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// to complete the drag and ensure that whatever happens to be under the pointer does
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// not get triggered if the drag was cancelled with Esc.
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if (event.type() == Clutter.EventType.BUTTON_RELEASE ||
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(event.type() == Clutter.EventType.TOUCH_END &&
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global.display.is_pointer_emulating_sequence(event.get_event_sequence()))) {
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this._buttonDown = false;
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if (this._dragInProgress) {
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return this._dragActorDropped(event);
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} else if (this._dragActor != null && !this._animationInProgress) {
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// Drag must have been cancelled with Esc.
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this._dragComplete();
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return Clutter.EVENT_STOP;
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} else {
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// Drag has never started.
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this._ungrabActor();
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return Clutter.EVENT_PROPAGATE;
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}
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// We intercept MOTION event to figure out if the drag has started and to draw
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// this._dragActor under the pointer when dragging is in progress
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} else if (event.type() == Clutter.EventType.MOTION ||
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(event.type() == Clutter.EventType.TOUCH_UPDATE &&
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global.display.is_pointer_emulating_sequence(event.get_event_sequence()))) {
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if (this._dragInProgress) {
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return this._updateDragPosition(event);
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} else if (this._dragActor == null) {
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return this._maybeStartDrag(event);
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}
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// We intercept KEY_PRESS event so that we can process Esc key press to cancel
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// dragging and ignore all other key presses.
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} else if (event.type() == Clutter.EventType.KEY_PRESS && this._dragInProgress) {
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let symbol = event.get_key_symbol();
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if (symbol == Clutter.Escape) {
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this._cancelDrag(event.get_time());
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return Clutter.EVENT_STOP;
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}
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}
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return Clutter.EVENT_PROPAGATE;
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},
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/**
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* fakeRelease:
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*
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* Fake a release event.
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* Must be called if you want to intercept release events on draggable
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* actors for other purposes (for example if you're using
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* PopupMenu.ignoreRelease())
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*/
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fakeRelease() {
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this._buttonDown = false;
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this._ungrabActor();
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},
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/**
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* startDrag:
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* @stageX: X coordinate of event
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* @stageY: Y coordinate of event
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* @time: Event timestamp
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*
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* Directly initiate a drag and drop operation from the given actor.
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* This function is useful to call if you've specified manualMode
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* for the draggable.
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*/
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startDrag(stageX, stageY, time, sequence) {
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currentDraggable = this;
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this._dragInProgress = true;
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// Special-case St.Button: the pointer grab messes with the internal
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// state, so force a reset to a reasonable state here
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if (this.actor instanceof St.Button) {
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this.actor.fake_release();
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this.actor.hover = false;
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}
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this.emit('drag-begin', time);
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if (this._onEventId)
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this._ungrabActor();
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this._touchSequence = sequence;
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this._grabEvents();
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global.screen.set_cursor(Meta.Cursor.DND_IN_DRAG);
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this._dragX = this._dragStartX = stageX;
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this._dragY = this._dragStartY = stageY;
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if (this.actor._delegate && this.actor._delegate.getDragActor) {
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this._dragActor = this.actor._delegate.getDragActor();
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Main.uiGroup.add_child(this._dragActor);
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this._dragActor.raise_top();
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Shell.util_set_hidden_from_pick(this._dragActor, true);
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// Drag actor does not always have to be the same as actor. For example drag actor
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// can be an image that's part of the actor. So to perform "snap back" correctly we need
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// to know what was the drag actor source.
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if (this.actor._delegate.getDragActorSource) {
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this._dragActorSource = this.actor._delegate.getDragActorSource();
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// If the user dragged from the source, then position
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// the dragActor over it. Otherwise, center it
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// around the pointer
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let [sourceX, sourceY] = this._dragActorSource.get_transformed_position();
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let x, y;
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if (stageX > sourceX && stageX <= sourceX + this._dragActor.width &&
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stageY > sourceY && stageY <= sourceY + this._dragActor.height) {
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x = sourceX;
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y = sourceY;
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} else {
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x = stageX - this._dragActor.width / 2;
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y = stageY - this._dragActor.height / 2;
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}
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this._dragActor.set_position(x, y);
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} else {
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this._dragActorSource = this.actor;
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}
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this._dragOrigParent = undefined;
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this._dragOffsetX = this._dragActor.x - this._dragStartX;
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this._dragOffsetY = this._dragActor.y - this._dragStartY;
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} else {
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this._dragActor = this.actor;
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this._dragActorSource = undefined;
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this._dragOrigParent = this.actor.get_parent();
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this._dragOrigX = this._dragActor.x;
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this._dragOrigY = this._dragActor.y;
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this._dragOrigScale = this._dragActor.scale_x;
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// Set the actor's scale such that it will keep the same
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// transformed size when it's reparented to the uiGroup
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let [scaledWidth, scaledHeight] = this.actor.get_transformed_size();
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this._dragActor.set_scale(scaledWidth / this.actor.width,
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scaledHeight / this.actor.height);
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let [actorStageX, actorStageY] = this.actor.get_transformed_position();
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this._dragOffsetX = actorStageX - this._dragStartX;
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this._dragOffsetY = actorStageY - this._dragStartY;
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this._dragOrigParent.remove_actor(this._dragActor);
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Main.uiGroup.add_child(this._dragActor);
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this._dragActor.raise_top();
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Shell.util_set_hidden_from_pick(this._dragActor, true);
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}
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this._dragOrigOpacity = this._dragActor.opacity;
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if (this._dragActorOpacity != undefined)
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this._dragActor.opacity = this._dragActorOpacity;
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this._snapBackX = this._dragStartX + this._dragOffsetX;
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this._snapBackY = this._dragStartY + this._dragOffsetY;
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this._snapBackScale = this._dragActor.scale_x;
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if (this._dragActorMaxSize != undefined) {
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let [scaledWidth, scaledHeight] = this._dragActor.get_transformed_size();
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let currentSize = Math.max(scaledWidth, scaledHeight);
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if (currentSize > this._dragActorMaxSize) {
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let scale = this._dragActorMaxSize / currentSize;
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let origScale = this._dragActor.scale_x;
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let origDragOffsetX = this._dragOffsetX;
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let origDragOffsetY = this._dragOffsetY;
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// The position of the actor changes as we scale
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// around the drag position, but we can't just tween
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// to the final position because that tween would
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// fight with updates as the user continues dragging
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// the mouse; instead we do the position computations in
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// an onUpdate() function.
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Tweener.addTween(this._dragActor,
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{ scale_x: scale * origScale,
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scale_y: scale * origScale,
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time: SCALE_ANIMATION_TIME,
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transition: 'easeOutQuad',
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onUpdate() {
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let currentScale = this._dragActor.scale_x / origScale;
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this._dragOffsetX = currentScale * origDragOffsetX;
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this._dragOffsetY = currentScale * origDragOffsetY;
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this._dragActor.set_position(this._dragX + this._dragOffsetX,
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this._dragY + this._dragOffsetY);
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},
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onUpdateScope: this });
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}
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}
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},
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_maybeStartDrag(event) {
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let [stageX, stageY] = event.get_coords();
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// See if the user has moved the mouse enough to trigger a drag
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let threshold = Gtk.Settings.get_default().gtk_dnd_drag_threshold;
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if ((Math.abs(stageX - this._dragStartX) > threshold ||
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Math.abs(stageY - this._dragStartY) > threshold)) {
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this.startDrag(stageX, stageY, event.get_time(), this._touchSequence);
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this._updateDragPosition(event);
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}
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return true;
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},
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_pickTargetActor() {
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return this._dragActor.get_stage().get_actor_at_pos(Clutter.PickMode.ALL,
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this._dragX, this._dragY);
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},
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_updateDragHover() {
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this._updateHoverId = 0;
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let target = this._pickTargetActor();
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let dragEvent = {
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x: this._dragX,
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y: this._dragY,
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dragActor: this._dragActor,
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source: this.actor._delegate,
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targetActor: target
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};
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let targetActorDestroyHandlerId;
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let handleTargetActorDestroyClosure;
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handleTargetActorDestroyClosure = () => {
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target = this._pickTargetActor();
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dragEvent.targetActor = target;
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targetActorDestroyHandlerId =
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target.connect('destroy', handleTargetActorDestroyClosure);
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};
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targetActorDestroyHandlerId =
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target.connect('destroy', handleTargetActorDestroyClosure);
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for (let i = 0; i < dragMonitors.length; i++) {
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let motionFunc = dragMonitors[i].dragMotion;
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if (motionFunc) {
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let result = motionFunc(dragEvent);
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if (result != DragMotionResult.CONTINUE) {
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global.screen.set_cursor(DRAG_CURSOR_MAP[result]);
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return GLib.SOURCE_REMOVE;
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}
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}
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}
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dragEvent.targetActor.disconnect(targetActorDestroyHandlerId);
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while (target) {
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if (target._delegate && target._delegate.handleDragOver) {
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let [r, targX, targY] = target.transform_stage_point(this._dragX, this._dragY);
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// We currently loop through all parents on drag-over even if one of the children has handled it.
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// We can check the return value of the function and break the loop if it's true if we don't want
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// to continue checking the parents.
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let result = target._delegate.handleDragOver(this.actor._delegate,
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this._dragActor,
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targX,
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targY,
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0);
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if (result != DragMotionResult.CONTINUE) {
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global.screen.set_cursor(DRAG_CURSOR_MAP[result]);
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return GLib.SOURCE_REMOVE;
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}
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}
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target = target.get_parent();
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}
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global.screen.set_cursor(Meta.Cursor.DND_IN_DRAG);
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return GLib.SOURCE_REMOVE;
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},
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_queueUpdateDragHover() {
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if (this._updateHoverId)
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return;
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this._updateHoverId = GLib.idle_add(GLib.PRIORITY_DEFAULT,
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this._updateDragHover.bind(this));
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GLib.Source.set_name_by_id(this._updateHoverId, '[gnome-shell] this._updateDragHover');
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},
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_updateDragPosition(event) {
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let [stageX, stageY] = event.get_coords();
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this._dragX = stageX;
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this._dragY = stageY;
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this._dragActor.set_position(stageX + this._dragOffsetX,
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stageY + this._dragOffsetY);
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this._queueUpdateDragHover();
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return true;
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},
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_dragActorDropped(event) {
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let [dropX, dropY] = event.get_coords();
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let target = this._dragActor.get_stage().get_actor_at_pos(Clutter.PickMode.ALL,
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dropX, dropY);
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// We call observers only once per motion with the innermost
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// target actor. If necessary, the observer can walk the
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// parent itself.
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let dropEvent = {
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dropActor: this._dragActor,
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targetActor: target,
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clutterEvent: event
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};
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for (let i = 0; i < dragMonitors.length; i++) {
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let dropFunc = dragMonitors[i].dragDrop;
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if (dropFunc)
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switch (dropFunc(dropEvent)) {
|
|
case DragDropResult.FAILURE:
|
|
case DragDropResult.SUCCESS:
|
|
return true;
|
|
case DragDropResult.CONTINUE:
|
|
continue;
|
|
}
|
|
}
|
|
|
|
// At this point it is too late to cancel a drag by destroying
|
|
// the actor, the fate of which is decided by acceptDrop and its
|
|
// side-effects
|
|
this._dragCancellable = false;
|
|
|
|
while (target) {
|
|
if (target._delegate && target._delegate.acceptDrop) {
|
|
let [r, targX, targY] = target.transform_stage_point(dropX, dropY);
|
|
if (target._delegate.acceptDrop(this.actor._delegate,
|
|
this._dragActor,
|
|
targX,
|
|
targY,
|
|
event.get_time())) {
|
|
// If it accepted the drop without taking the actor,
|
|
// handle it ourselves.
|
|
if (this._dragActor.get_parent() == Main.uiGroup) {
|
|
if (this._restoreOnSuccess) {
|
|
this._restoreDragActor(event.get_time());
|
|
return true;
|
|
} else
|
|
this._dragActor.destroy();
|
|
}
|
|
|
|
this._dragInProgress = false;
|
|
global.screen.set_cursor(Meta.Cursor.DEFAULT);
|
|
this.emit('drag-end', event.get_time(), true);
|
|
this._dragComplete();
|
|
return true;
|
|
}
|
|
}
|
|
target = target.get_parent();
|
|
}
|
|
|
|
this._cancelDrag(event.get_time());
|
|
|
|
return true;
|
|
},
|
|
|
|
_getRestoreLocation() {
|
|
let x, y, scale;
|
|
|
|
if (this._dragActorSource && this._dragActorSource.visible) {
|
|
// Snap the clone back to its source
|
|
[x, y] = this._dragActorSource.get_transformed_position();
|
|
let [sourceScaledWidth, sourceScaledHeight] = this._dragActorSource.get_transformed_size();
|
|
scale = sourceScaledWidth ? this._dragActor.width / sourceScaledWidth : 0;
|
|
} else if (this._dragOrigParent) {
|
|
// Snap the actor back to its original position within
|
|
// its parent, adjusting for the fact that the parent
|
|
// may have been moved or scaled
|
|
let [parentX, parentY] = this._dragOrigParent.get_transformed_position();
|
|
let [parentWidth, parentHeight] = this._dragOrigParent.get_size();
|
|
let [parentScaledWidth, parentScaledHeight] = this._dragOrigParent.get_transformed_size();
|
|
let parentScale = 1.0;
|
|
if (parentWidth != 0)
|
|
parentScale = parentScaledWidth / parentWidth;
|
|
|
|
x = parentX + parentScale * this._dragOrigX;
|
|
y = parentY + parentScale * this._dragOrigY;
|
|
scale = this._dragOrigScale * parentScale;
|
|
} else {
|
|
// Snap back actor to its original stage position
|
|
x = this._snapBackX;
|
|
y = this._snapBackY;
|
|
scale = this._snapBackScale;
|
|
}
|
|
|
|
return [x, y, scale];
|
|
},
|
|
|
|
_cancelDrag(eventTime) {
|
|
this.emit('drag-cancelled', eventTime);
|
|
this._dragInProgress = false;
|
|
let [snapBackX, snapBackY, snapBackScale] = this._getRestoreLocation();
|
|
|
|
if (this._actorDestroyed) {
|
|
global.screen.set_cursor(Meta.Cursor.DEFAULT);
|
|
if (!this._buttonDown)
|
|
this._dragComplete();
|
|
this.emit('drag-end', eventTime, false);
|
|
if (!this._dragOrigParent)
|
|
this._dragActor.destroy();
|
|
|
|
return;
|
|
}
|
|
|
|
this._animateDragEnd(eventTime,
|
|
{ x: snapBackX,
|
|
y: snapBackY,
|
|
scale_x: snapBackScale,
|
|
scale_y: snapBackScale,
|
|
time: SNAP_BACK_ANIMATION_TIME,
|
|
});
|
|
},
|
|
|
|
_restoreDragActor(eventTime) {
|
|
this._dragInProgress = false;
|
|
let [restoreX, restoreY, restoreScale] = this._getRestoreLocation();
|
|
|
|
// fade the actor back in at its original location
|
|
this._dragActor.set_position(restoreX, restoreY);
|
|
this._dragActor.set_scale(restoreScale, restoreScale);
|
|
this._dragActor.opacity = 0;
|
|
|
|
this._animateDragEnd(eventTime,
|
|
{ time: REVERT_ANIMATION_TIME });
|
|
},
|
|
|
|
_animateDragEnd(eventTime, params) {
|
|
this._animationInProgress = true;
|
|
|
|
// finish animation if the actor gets destroyed
|
|
// during it
|
|
this._dragActorDestroyId =
|
|
this._dragActor.connect('destroy',
|
|
this._finishAnimation.bind(this));
|
|
|
|
params['opacity'] = this._dragOrigOpacity;
|
|
params['transition'] = 'easeOutQuad';
|
|
params['onComplete'] = this._onAnimationComplete;
|
|
params['onCompleteScope'] = this;
|
|
params['onCompleteParams'] = [this._dragActor, eventTime];
|
|
|
|
// start the animation
|
|
Tweener.addTween(this._dragActor, params)
|
|
},
|
|
|
|
_finishAnimation() {
|
|
if (!this._animationInProgress)
|
|
return
|
|
|
|
this._animationInProgress = false;
|
|
if (!this._buttonDown)
|
|
this._dragComplete();
|
|
|
|
global.screen.set_cursor(Meta.Cursor.DEFAULT);
|
|
},
|
|
|
|
_onAnimationComplete(dragActor, eventTime) {
|
|
dragActor.disconnect(this._dragActorDestroyId);
|
|
this._dragActorDestroyId = 0;
|
|
|
|
if (this._dragOrigParent) {
|
|
Main.uiGroup.remove_child(this._dragActor);
|
|
this._dragOrigParent.add_actor(this._dragActor);
|
|
dragActor.set_scale(this._dragOrigScale, this._dragOrigScale);
|
|
dragActor.set_position(this._dragOrigX, this._dragOrigY);
|
|
} else {
|
|
dragActor.destroy();
|
|
}
|
|
|
|
this.emit('drag-end', eventTime, false);
|
|
this._finishAnimation();
|
|
},
|
|
|
|
_dragComplete() {
|
|
if (!this._actorDestroyed)
|
|
Shell.util_set_hidden_from_pick(this._dragActor, false);
|
|
|
|
this._ungrabEvents();
|
|
global.sync_pointer();
|
|
|
|
if (this._updateHoverId) {
|
|
GLib.source_remove(this._updateHoverId);
|
|
this._updateHoverId = 0;
|
|
}
|
|
|
|
this._dragActor = undefined;
|
|
currentDraggable = null;
|
|
}
|
|
});
|
|
|
|
Signals.addSignalMethods(_Draggable.prototype);
|
|
|
|
/**
|
|
* makeDraggable:
|
|
* @actor: Source actor
|
|
* @params: (optional) Additional parameters
|
|
*
|
|
* Create an object which controls drag and drop for the given actor.
|
|
*
|
|
* If %manualMode is %true in @params, do not automatically start
|
|
* drag and drop on click
|
|
*
|
|
* If %dragActorMaxSize is present in @params, the drag actor will
|
|
* be scaled down to be no larger than that size in pixels.
|
|
*
|
|
* If %dragActorOpacity is present in @params, the drag actor will
|
|
* will be set to have that opacity during the drag.
|
|
*
|
|
* Note that when the drag actor is the source actor and the drop
|
|
* succeeds, the actor scale and opacity aren't reset; if the drop
|
|
* target wants to reuse the actor, it's up to the drop target to
|
|
* reset these values.
|
|
*/
|
|
function makeDraggable(actor, params) {
|
|
return new _Draggable(actor, params);
|
|
}
|