62 lines
2.3 KiB
Plaintext
62 lines
2.3 KiB
Plaintext
/// <reference path="../../references.js" />
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(function () {
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"use strict";
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// Some useless comment
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var deltaDecorations = function (oldDecorations, newDecorations) {
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/// <summary>
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/// Update oldDecorations to match newDecorations.
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/// It will remove old decorations which are not found in new decorations
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/// and add only the really new decorations.
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/// </summary>
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/// <param name="oldDecorations" type="Array">
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/// An array containing ids of existing decorations
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/// </param>
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/// <param name="newDecorations" type="Array">
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/// An array containing literal objects describing new decorations. A
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/// literal contains the following two fields:
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/// range
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/// options
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/// </param>
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/// <returns type="Array">
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/// Returns an array of decorations ids
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/// </returns>
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var hashFunc = function (range, options) {
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return range.startLineNumber + "," + range.startColumn + "-" + range.endLineNumber + "," + range.endColumn +
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"-" + options.hoverMessage + "-" + options.className + "-" + options.isOverlay + "-" + options.showInOverviewRuler;
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};
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return this.changeDecorations(function (changeAccessor) {
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var i, len, oldDecorationsMap = {}, hash;
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// Record old decorations in a map
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for (i = 0, len = oldDecorations.length; i < len; i++) {
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hash = hashFunc(this.getDecorationRange(oldDecorations[i]), this.getDecorationOptions(oldDecorations[i]));
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oldDecorationsMap[hash] = i;
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}
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// Add only new decorations & mark reused ones
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var result = [], usedOldDecorationsMap = {};
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for (i = 0, len = newDecorations.length; i < len; i++) {
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hash = hashFunc(newDecorations[i].range, newDecorations[i].options);
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if (oldDecorationsMap.hasOwnProperty(hash)) {
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usedOldDecorationsMap[oldDecorationsMap[hash]] = true;
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result.push(oldDecorations[oldDecorationsMap[hash]]);
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} else {
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result.push(changeAccessor.addDecoration(newDecorations[i].range, newDecorations[i].options));
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}
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}
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// Remove unused old decorations
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for (i = 0, len = oldDecorations.length; i < len; i++) {
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if (!usedOldDecorationsMap.hasOwnProperty(i)) {
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changeAccessor.removeDecoration(oldDecorations[i]);
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}
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}
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return result;
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}.bind(this));
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};
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})();
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