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Only update rotate control element when it's needed

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To avoid a lot of 'Recalculate style' events by the browser.
This commit is contained in:
Frederic Junod
2014-08-20 10:53:44 +02:00
parent 7c14399133
commit 27ae50e673
1 changed files with 15 additions and 6 deletions
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9
src/ol/control/rotatecontrol.js
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@@ -88,6 +88,12 @@ ol.control.Rotate = function(opt_options) {
*/ */
this.autoHide_ = goog.isDef(options.autoHide) ? options.autoHide : true; this.autoHide_ = goog.isDef(options.autoHide) ? options.autoHide : true;
/**
* @private
* @type {number|undefined}
*/
this.rotation_ = undefined;
element.style.opacity = (this.autoHide_) ? 0 : 1; element.style.opacity = (this.autoHide_) ? 0 : 1;
}; };
@@ -152,6 +158,7 @@ ol.control.Rotate.prototype.handleMapPostrender = function(mapEvent) {
return; return;
} }
var rotation = frameState.viewState.rotation; var rotation = frameState.viewState.rotation;
if (rotation != this.rotation_) {
var transform = 'rotate(' + goog.math.toDegrees(rotation) + 'deg)'; var transform = 'rotate(' + goog.math.toDegrees(rotation) + 'deg)';
if (this.autoHide_) { if (this.autoHide_) {
this.element.style.opacity = (rotation === 0) ? 0 : 1; this.element.style.opacity = (rotation === 0) ? 0 : 1;
@@ -159,4 +166,6 @@ ol.control.Rotate.prototype.handleMapPostrender = function(mapEvent) {
this.label_.style.msTransform = transform; this.label_.style.msTransform = transform;
this.label_.style.webkitTransform = transform; this.label_.style.webkitTransform = transform;
this.label_.style.transform = transform; this.label_.style.transform = transform;
}
this.rotation_ = rotation;
}; };