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Cache text width calculation for better performance

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Dennis Hotson 2011-08-11 02:33:31 +10:00
parent 0aea9582ff
commit 12bbab87c2
1 changed files with 8 additions and 1 deletions
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9
springyui.js
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@ -121,11 +121,18 @@ jQuery.fn.springy = function(params) {
}); });
Node.prototype.getWidth = function() { Node.prototype.getWidth = function() {
ctx.save();
var text = typeof(this.data.label) !== 'undefined' ? this.data.label : this.id; var text = typeof(this.data.label) !== 'undefined' ? this.data.label : this.id;
if (this._width && this._width[text])
return this._width[text];
ctx.save();
ctx.font = "16px Verdana, sans-serif"; ctx.font = "16px Verdana, sans-serif";
var width = ctx.measureText(text).width + 10; var width = ctx.measureText(text).width + 10;
ctx.restore(); ctx.restore();
this._width || (this._width = {});
this._width[text] = width;
return width; return width;
}; };