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perf(ngAnimate): avoid repeated calls to addClass/removeClass when an…
…imation has no duration Background: ngAnimate writes helper classes to DOM elements to see if animations are defined on them. If many elements have the same definition, and the same parent, we can cache the definition and skip the application of the helper classes altogether. This helps particularly with large ngRepeat collections. Closes #14165 Closes #14166 Closes #16613
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| 'use strict'; | ||
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| /** @this */ | ||
| var $$AnimateCacheProvider = function() { | ||
|
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| var KEY = '$$ngAnimateParentKey'; | ||
| var parentCounter = 0; | ||
| var cache = Object.create(null); | ||
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| this.$get = [function() { | ||
| return { | ||
| cacheKey: function(node, method, addClass, removeClass) { | ||
| var parentNode = node.parentNode; | ||
| var parentID = parentNode[KEY] || (parentNode[KEY] = ++parentCounter); | ||
| var parts = [parentID, method, node.getAttribute('class')]; | ||
| if (addClass) { | ||
| parts.push(addClass); | ||
| } | ||
| if (removeClass) { | ||
| parts.push(removeClass); | ||
| } | ||
| return parts.join(' '); | ||
| }, | ||
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| containsCachedAnimationWithoutDuration: function(key) { | ||
| var entry = cache[key]; | ||
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| // nothing cached, so go ahead and animate | ||
| // otherwise it should be a valid animation | ||
| return (entry && !entry.isValid) || false; | ||
| }, | ||
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| flush: function() { | ||
| cache = Object.create(null); | ||
| }, | ||
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| count: function(key) { | ||
| var entry = cache[key]; | ||
| return entry ? entry.total : 0; | ||
| }, | ||
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| get: function(key) { | ||
| var entry = cache[key]; | ||
| return entry && entry.value; | ||
| }, | ||
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| put: function(key, value, isValid) { | ||
| if (!cache[key]) { | ||
| cache[key] = { total: 1, value: value, isValid: isValid }; | ||
| } else { | ||
| cache[key].total++; | ||
| cache[key].value = value; | ||
| } | ||
| } | ||
| }; | ||
| }]; | ||
| }; |
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