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appDisplay: Only use dragMonitor for one icon at a time

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Instead of adding a dragMonitor for every icon in the grid as soon as
one icon is getting dragged, only add a dragMonitor for the icon that is
currently being dragged over (ie. the current drag-target). With a large
number of icons in the iconGrid, this should significantly reduce lags
while dragging.

We can do this by detecting the DnD-entering of an icon or folder using
the `handleDragOver()` callback of drag-targets, adding the dragMonitor
because we know an icon is hovering above the drag-target and then
detecting the DnD-leaving of the drag-target by using the `dragMotion()`
handler, where we remove the dragMonitor again as soon as the
targetActor is no longer our actor (ie. the drag-target).

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/849
This commit is contained in:
Jonas Dreßler 2019-10-30 00:06:10 +01:00 committed by Georges Basile Stavracas Neto
parent 766e9034e2
commit 702417ce83
1 changed files with 41 additions and 53 deletions
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86
js/ui/appDisplay.js
View File

@ -1499,10 +1499,7 @@ var FolderIcon = GObject.registerClass({
this.view = new FolderView(this._folder, id, parentView);
this._itemDragBeginId = Main.overview.connect(
'item-drag-begin', this._onDragBegin.bind(this));
this._itemDragEndId = Main.overview.connect(
'item-drag-end', this._onDragEnd.bind(this));
this._iconIsHovering = false;
this.connect('destroy', this._onDestroy.bind(this));
@ -1512,9 +1509,6 @@ var FolderIcon = GObject.registerClass({
}
_onDestroy() {
Main.overview.disconnect(this._itemDragBeginId);
Main.overview.disconnect(this._itemDragEndId);
if (this._dragMonitor) {
DND.removeDragMonitor(this._dragMonitor);
this._dragMonitor = null;
@ -1552,29 +1546,32 @@ var FolderIcon = GObject.registerClass({
return this.view.getAllItems().map(item => item.id);
}
_onDragBegin() {
_setHoveringByDnd(hovering) {
if (this._iconIsHovering == hovering)
return;
this._iconIsHovering = hovering;
if (hovering) {
this._dragMonitor = {
dragMotion: this._onDragMotion.bind(this),
};
DND.addDragMonitor(this._dragMonitor);
this.add_style_pseudo_class('drop');
} else {
DND.removeDragMonitor(this._dragMonitor);
this.remove_style_pseudo_class('drop');
}
}
_onDragMotion(dragEvent) {
let target = dragEvent.targetActor;
if (!this.contains(target) || !this._canAccept(dragEvent.source))
this.remove_style_pseudo_class('drop');
else
this.add_style_pseudo_class('drop');
if (!this.contains(dragEvent.targetActor) ||
!this._canAccept(dragEvent.source))
this._setHoveringByDnd(false);
return DND.DragMotionResult.CONTINUE;
}
_onDragEnd() {
this.remove_style_pseudo_class('drop');
DND.removeDragMonitor(this._dragMonitor);
}
_canAccept(source) {
if (!(source instanceof AppIcon))
return false;
@ -1593,10 +1590,14 @@ var FolderIcon = GObject.registerClass({
if (!this._canAccept(source))
return DND.DragMotionResult.NO_DROP;
this._setHoveringByDnd(true);
return DND.DragMotionResult.MOVE_DROP;
}
acceptDrop(source) {
this._setHoveringByDnd(false);
if (!this._canAccept(source))
return false;
@ -2026,7 +2027,6 @@ var AppIcon = GObject.registerClass({
this._delegate = this;
this._hasDndHover = false;
this._folderPreviewId = 0;
// Get the isDraggable property without passing it on to the BaseIcon:
@ -2075,11 +2075,7 @@ var AppIcon = GObject.registerClass({
});
}
this._dragMonitor = null;
this._itemDragBeginId = Main.overview.connect(
'item-drag-begin', this._onDragBegin.bind(this));
this._itemDragEndId = Main.overview.connect(
'item-drag-end', this._onDragEnd.bind(this));
this._otherIconIsHovering = false;
this._menuTimeoutId = 0;
this._stateChangedId = this.app.connect('notify::state', () => {
@ -2091,9 +2087,6 @@ var AppIcon = GObject.registerClass({
}
_onDestroy() {
Main.overview.disconnect(this._itemDragBeginId);
Main.overview.disconnect(this._itemDragEndId);
if (this._folderPreviewId > 0) {
GLib.source_remove(this._folderPreviewId);
this._folderPreviewId = 0;
@ -2340,7 +2333,17 @@ var AppIcon = GObject.registerClass({
}
_setHoveringByDnd(hovering) {
if (this._otherIconIsHovering == hovering)
return;
this._otherIconIsHovering = hovering;
if (hovering) {
this._dragMonitor = {
dragMotion: this._onDragMotion.bind(this),
};
DND.addDragMonitor(this._dragMonitor);
if (this._folderPreviewId > 0)
return;
@ -2352,6 +2355,8 @@ var AppIcon = GObject.registerClass({
return GLib.SOURCE_REMOVE;
});
} else {
DND.removeDragMonitor(this._dragMonitor);
if (this._folderPreviewId > 0) {
GLib.source_remove(this._folderPreviewId);
this._folderPreviewId = 0;
@ -2361,32 +2366,13 @@ var AppIcon = GObject.registerClass({
}
}
_onDragBegin() {
this._dragMonitor = {
dragMotion: this._onDragMotion.bind(this),
};
DND.addDragMonitor(this._dragMonitor);
}
_onDragMotion(dragEvent) {
let target = dragEvent.targetActor;
let isHovering = target == this || this.contains(target);
let canDrop = this._canAccept(dragEvent.source);
let hasDndHover = isHovering && canDrop;
if (this._hasDndHover != hasDndHover) {
this._setHoveringByDnd(hasDndHover);
this._hasDndHover = hasDndHover;
}
if (!this.contains(dragEvent.targetActor))
this._setHoveringByDnd(false);
return DND.DragMotionResult.CONTINUE;
}
_onDragEnd() {
this.remove_style_pseudo_class('drop');
DND.removeDragMonitor(this._dragMonitor);
}
handleDragOver(source) {
if (source == this)
return DND.DragMotionResult.NO_DROP;
@ -2394,6 +2380,8 @@ var AppIcon = GObject.registerClass({
if (!this._canAccept(source))
return DND.DragMotionResult.CONTINUE;
this._setHoveringByDnd(true);
return DND.DragMotionResult.MOVE_DROP;
}