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gnome-shell/0001-dnd-Nullify-_dragActor-after-we-ve-destroyed-it-and-.patch

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Replace dnd fix with upstream version, backport some other fixes The dnd fix in -5 was actually redundant, a similar fix for the same bug had already been committed upstream. Replace it with the upstream version, plus three other fixes from the same MR. Also add several other fixes from post-3.30.0 git master which look important and useful.
2018-09-19 18:41:10 +00:00
From 3033506f2c266115a00ff43daaad14e59e3215c5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marco=20Trevisan=20=28Trevi=C3=B1o=29?= <mail@3v1n0.net>
Date: Tue, 5 Dec 2017 22:41:17 +0100
Subject: [PATCH 1/4] dnd: Nullify _dragActor after we've destroyed it, and
avoid invalid access
We need to avoid that we use the _dragActor instance after that it has
been destroyed or we'll get errors. We now set it to null when this
happens, protecting any access to that.
Add a DragState enum-like object to keep track of the state
instead of using booleans.
Remove duplicated handler on 'destroy' and just use a generic one.
https://bugzilla.gnome.org/show_bug.cgi?id=791233
---
js/ui/dnd.js | 65 +++++++++++++++++++++++++++++++---------------------
1 file changed, 39 insertions(+), 26 deletions(-)
diff --git a/js/ui/dnd.js b/js/ui/dnd.js
index 634a7d6d7..8483e89fc 100644
--- a/js/ui/dnd.js
+++ b/js/ui/dnd.js
@@ -27,6 +27,12 @@ var DragMotionResult = {
CONTINUE: 3
};
+var DragState = {
+ INIT: 0,
+ DRAGGING: 1,
+ CANCELLED: 2,
+};
+
var DRAG_CURSOR_MAP = {
0: Meta.Cursor.DND_UNSUPPORTED_TARGET,
1: Meta.Cursor.DND_COPY,
@@ -78,6 +84,8 @@ var _Draggable = new Lang.Class({
dragActorOpacity: undefined });
this.actor = actor;
+ this._dragState = DragState.INIT;
+
if (!params.manualMode) {
this.actor.connect('button-press-event',
this._onButtonPress.bind(this));
@@ -88,7 +96,7 @@ var _Draggable = new Lang.Class({
this.actor.connect('destroy', () => {
this._actorDestroyed = true;
- if (this._dragInProgress && this._dragCancellable)
+ if (this._dragState == DragState.DRAGGING && this._dragCancellable)
this._cancelDrag(global.get_current_time());
this.disconnectAll();
});
@@ -100,7 +108,6 @@ var _Draggable = new Lang.Class({
this._dragActorOpacity = params.dragActorOpacity;
this._buttonDown = false; // The mouse button has been pressed and has not yet been released.
- this._dragInProgress = false; // The drag has been started, and has not been dropped or cancelled yet.
this._animationInProgress = false; // The drag is over and the item is in the process of animating to its original position (snapping back or reverting).
this._dragCancellable = true;
@@ -206,9 +213,10 @@ var _Draggable = new Lang.Class({
(event.type() == Clutter.EventType.TOUCH_END &&
global.display.is_pointer_emulating_sequence(event.get_event_sequence()))) {
this._buttonDown = false;
- if (this._dragInProgress) {
+ if (this._dragState == DragState.DRAGGING) {
return this._dragActorDropped(event);
- } else if (this._dragActor != null && !this._animationInProgress) {
+ } else if ((this._dragActor != null || this._dragState == DragState.CANCELLED) &&
+ !this._animationInProgress) {
// Drag must have been cancelled with Esc.
this._dragComplete();
return Clutter.EVENT_STOP;
@@ -222,14 +230,14 @@ var _Draggable = new Lang.Class({
} else if (event.type() == Clutter.EventType.MOTION ||
(event.type() == Clutter.EventType.TOUCH_UPDATE &&
global.display.is_pointer_emulating_sequence(event.get_event_sequence()))) {
- if (this._dragInProgress) {
+ if (this._dragActor && this._dragState == DragState.DRAGGING) {
return this._updateDragPosition(event);
- } else if (this._dragActor == null) {
+ } else if (this._dragActor == null && this._dragState != DragState.CANCELLED) {
return this._maybeStartDrag(event);
}
// We intercept KEY_PRESS event so that we can process Esc key press to cancel
// dragging and ignore all other key presses.
- } else if (event.type() == Clutter.EventType.KEY_PRESS && this._dragInProgress) {
+ } else if (event.type() == Clutter.EventType.KEY_PRESS && this._dragState == DragState.DRAGGING) {
let symbol = event.get_key_symbol();
if (symbol == Clutter.Escape) {
this._cancelDrag(event.get_time());
@@ -265,7 +273,7 @@ var _Draggable = new Lang.Class({
*/
startDrag(stageX, stageY, time, sequence) {
currentDraggable = this;
- this._dragInProgress = true;
+ this._dragState = DragState.DRAGGING;
// Special-case St.Button: the pointer grab messes with the internal
// state, so force a reset to a reasonable state here
@@ -342,6 +350,13 @@ var _Draggable = new Lang.Class({
Shell.util_set_hidden_from_pick(this._dragActor, true);
}
+ this._dragActorDestroyId = this._dragActor.connect('destroy', () => {
+ // Cancel ongoing animation (if any)
+ this._finishAnimation();
+
+ this._dragActor = null;
+ this._dragState = DragState.CANCELLED;
+ });
this._dragOrigOpacity = this._dragActor.opacity;
if (this._dragActorOpacity != undefined)
this._dragActor.opacity = this._dragActorOpacity;
@@ -500,7 +515,7 @@ var _Draggable = new Lang.Class({
event.get_time())) {
// If it accepted the drop without taking the actor,
// handle it ourselves.
- if (this._dragActor.get_parent() == Main.uiGroup) {
+ if (this._dragActor && this._dragActor.get_parent() == Main.uiGroup) {
if (this._restoreOnSuccess) {
this._restoreDragActor(event.get_time());
return true;
@@ -508,7 +523,7 @@ var _Draggable = new Lang.Class({
this._dragActor.destroy();
}
- this._dragInProgress = false;
+ this._dragState = DragState.INIT;
global.display.set_cursor(Meta.Cursor.DEFAULT);
this.emit('drag-end', event.get_time(), true);
this._dragComplete();
@@ -557,20 +572,22 @@ var _Draggable = new Lang.Class({
_cancelDrag(eventTime) {
this.emit('drag-cancelled', eventTime);
- this._dragInProgress = false;
- let [snapBackX, snapBackY, snapBackScale] = this._getRestoreLocation();
+ let wasCancelled = (this._dragState == DragState.CANCELLED);
+ this._dragState = DragState.CANCELLED;
- if (this._actorDestroyed) {
+ if (this._actorDestroyed || wasCancelled) {
global.display.set_cursor(Meta.Cursor.DEFAULT);
if (!this._buttonDown)
this._dragComplete();
this.emit('drag-end', eventTime, false);
- if (!this._dragOrigParent)
+ if (!this._dragOrigParent && this._dragActor)
this._dragActor.destroy();
return;
}
+ let [snapBackX, snapBackY, snapBackScale] = this._getRestoreLocation();
+
this._animateDragEnd(eventTime,
{ x: snapBackX,
y: snapBackY,
@@ -581,7 +598,7 @@ var _Draggable = new Lang.Class({
},
_restoreDragActor(eventTime) {
- this._dragInProgress = false;
+ this._dragState = DragState.INIT;
let [restoreX, restoreY, restoreScale] = this._getRestoreLocation();
// fade the actor back in at its original location
@@ -596,12 +613,6 @@ var _Draggable = new Lang.Class({
_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;
@@ -624,9 +635,6 @@ var _Draggable = new Lang.Class({
},
_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);
@@ -641,7 +649,7 @@ var _Draggable = new Lang.Class({
},
_dragComplete() {
- if (!this._actorDestroyed)
+ if (!this._actorDestroyed && this._dragActor)
Shell.util_set_hidden_from_pick(this._dragActor, false);
this._ungrabEvents();
@@ -652,7 +660,12 @@ var _Draggable = new Lang.Class({
this._updateHoverId = 0;
}
- this._dragActor = undefined;
+ if (this._dragActor) {
+ this._dragActor.disconnect(this._dragActorDestroyId);
+ this._dragActor = null;
+ }
+
+ this._dragState = DragState.INIT;
currentDraggable = null;
}
});
--
2.19.0
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