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Added autoRefigureSizes flag for disabling calls to _figureSizes during bounds-change event handlers. This improves performance when a lot of bounds-change events are fired in quick succession. Used flag to optimize world._arrange.

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This commit is contained in:
Larissa Smith 2015-08-20 10:25:57 -06:00
parent 7076d64b1b
commit 24be6a52ed
1 changed files with 19 additions and 1 deletions
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18
src/world.js
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@ -52,8 +52,11 @@ $.World = function( options ) {
this.viewer = options.viewer;
this._items = [];
this._needsDraw = false;
this._autoRefigureSizes = true;
this._delegatedFigureSizes = function(event) {
if (this._autoRefigureSizes) {
_this._figureSizes();
}
};
this._figureSizes();
@ -275,6 +278,17 @@ $.extend( $.World.prototype, $.EventSource.prototype, /** @lends OpenSeadragon.W
return this._contentFactor;
},
/**
* As a performance optimization, setting this flag to false allows the bounds-change event handler
* on tiledImages to skip calls to _figureSizes. If a lot of images are going to be positioned in
* rapid succession, this is a good idea. _figuresSizes only needs to be called once when the
* positioning is done.
* @param {Boolean} [value] The value to which to set autoRefigureSizes.
*/
setAutoRefigureSizes: function(value) {
this._autoRefigureSizes = value;
},
/**
* Arranges all of the TiledImages with the specified settings.
* @param {Object} options - Specifies how to arrange.
@ -304,6 +318,8 @@ $.extend( $.World.prototype, $.EventSource.prototype, /** @lends OpenSeadragon.W
var x = 0;
var y = 0;
var item, box, width, height, position;
this.setAutoRefigureSizes(false);
for (var i = 0; i < this._items.length; i++) {
if (i && (i % wrap) === 0) {
if (layout === 'horizontal') {
@ -336,6 +352,8 @@ $.extend( $.World.prototype, $.EventSource.prototype, /** @lends OpenSeadragon.W
y += increment;
}
}
this.setAutoRefigureSizes(true);
this._figureSizes();
},
// private