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magnifier: Avoid caret/focus viewport changes while the pointer moves

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If there's a caret or focus move we should delay it until the pointer
is stationary for a little while so as to avoid jittery and spurious
viewport movements.

https://bugzilla.gnome.org/show_bug.cgi?id=752138
This commit is contained in:
Rui Matos 2015-07-24 18:47:34 +02:00
parent b8c2d4c6c7
commit f5865e895e
1 changed files with 30 additions and 2 deletions
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32
js/ui/magnifier.js
View File

@ -4,6 +4,7 @@ const Atspi = imports.gi.Atspi;
const Clutter = imports.gi.Clutter;
const GDesktopEnums = imports.gi.GDesktopEnums;
const Gio = imports.gi.Gio;
const GLib = imports.gi.GLib;
const Shell = imports.gi.Shell;
const St = imports.gi.St;
const Lang = imports.lang;
@ -22,6 +23,8 @@ const MOUSE_POLL_FREQUENCY = 50;
const CROSSHAIRS_CLIP_SIZE = [100, 100];
const NO_CHANGE = 0.0;
const POINTER_REST_TIME = 1000; // milliseconds
// Settings
const APPLICATIONS_SCHEMA = 'org.gnome.desktop.a11y.applications';
const SHOW_KEY = 'screen-magnifier-enabled';
@ -709,6 +712,9 @@ const ZoomRegion = new Lang.Class({
this._xCaret = 0;
this._yCaret = 0;
this._pointerIdleMonitor = Meta.IdleMonitor.get_for_device(Meta.VIRTUAL_CORE_POINTER_ID);
this._scrollContentsTimerId = 0;
Main.layoutManager.connect('monitors-changed',
Lang.bind(this, this._monitorsChanged));
this._focusCaretTracker.connect('caret-moved',
@ -1068,6 +1074,26 @@ const ZoomRegion = new Lang.Class({
return this._isMouseOverRegion();
},
_clearScrollContentsTimer: function() {
if (this._scrollContentsTimerId != 0) {
Mainloop.source_remove(this._scrollContentsTimerId);
this._scrollContentsTimerId = 0;
}
},
_scrollContentsToDelayed: function(x, y) {
if (this._pointerIdleMonitor.get_idletime() >= POINTER_REST_TIME) {
this.scrollContentsTo(x, y);
return;
}
this._clearScrollContentsTimer();
this._scrollContentsTimerId = Mainloop.timeout_add(POINTER_REST_TIME, Lang.bind(this, function() {
this._scrollContentsToDelayed(x, y);
return GLib.SOURCE_REMOVE;
}));
},
/**
* scrollContentsTo:
* Shift the contents of the magnified view such it is centered on the given
@ -1076,6 +1102,8 @@ const ZoomRegion = new Lang.Class({
* @y: The y-coord of the point to center on.
*/
scrollContentsTo: function(x, y) {
this._clearScrollContentsTimer();
this._followingCursor = false;
this._changeROI({ xCenter: x,
yCenter: y });
@ -1381,7 +1409,7 @@ const ZoomRegion = new Lang.Class({
else if (this._caretTrackingMode == GDesktopEnums.MagnifierCaretTrackingMode.CENTERED)
[xCaret, yCaret] = this._centerFromPointCentered(xCaret, yCaret);
this.scrollContentsTo(xCaret, yCaret);
this._scrollContentsToDelayed(xCaret, yCaret);
},
_centerFromFocusPosition: function() {
@ -1395,7 +1423,7 @@ const ZoomRegion = new Lang.Class({
else if (this._focusTrackingMode == GDesktopEnums.MagnifierFocusTrackingMode.CENTERED)
[xFocus, yFocus] = this._centerFromPointCentered(xFocus, yFocus);
this.scrollContentsTo(xFocus, yFocus);
this._scrollContentsToDelayed(xFocus, yFocus);
},
_centerFromPointPush: function(xPoint, yPoint) {