72 lines
2.6 KiB
TypeScript
72 lines
2.6 KiB
TypeScript
import {Directive, onCheck} from 'angular2/annotations';
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import {ElementRef} from 'angular2/core';
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import {PipeRegistry} from 'angular2/src/change_detection/pipes/pipe_registry';
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import {Pipe} from 'angular2/src/change_detection/pipes/pipe';
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import {Renderer} from 'angular2/src/render/api';
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import {KeyValueChanges} from 'angular2/src/change_detection/pipes/keyvalue_changes';
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import {IterableChanges} from 'angular2/src/change_detection/pipes/iterable_changes';
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import {isPresent, isString, StringWrapper} from 'angular2/src/facade/lang';
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import {ListWrapper, StringMapWrapper, isListLikeIterable} from 'angular2/src/facade/collection';
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@Directive({selector: '[class]', lifecycle: [onCheck], properties: ['rawClass: class']})
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export class CSSClass {
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_pipe: Pipe;
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_rawClass;
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constructor(private _pipeRegistry: PipeRegistry, private _ngEl: ElementRef,
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private _renderer: Renderer) {}
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set rawClass(v) {
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this._cleanupClasses(this._rawClass);
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if (isString(v)) {
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v = v.split(' ');
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}
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this._rawClass = v;
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this._pipe = this._pipeRegistry.get(isListLikeIterable(v) ? 'iterableDiff' : 'keyValDiff', v);
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}
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onCheck(): void {
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var diff = this._pipe.transform(this._rawClass);
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if (isPresent(diff) && isPresent(diff.wrapped)) {
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if (diff.wrapped instanceof IterableChanges) {
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this._applyArrayChanges(diff.wrapped);
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} else {
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this._applyObjectChanges(diff.wrapped);
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}
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}
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}
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private _cleanupClasses(rawClassVal): void {
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if (isPresent(rawClassVal)) {
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if (isListLikeIterable(rawClassVal)) {
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ListWrapper.forEach(rawClassVal, (className) => { this._toggleClass(className, false); });
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} else {
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StringMapWrapper.forEach(rawClassVal, (expVal, className) => {
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if (expVal) this._toggleClass(className, false);
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});
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}
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}
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}
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private _applyObjectChanges(diff: KeyValueChanges): void {
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diff.forEachAddedItem((record) => { this._toggleClass(record.key, record.currentValue); });
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diff.forEachChangedItem((record) => { this._toggleClass(record.key, record.currentValue); });
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diff.forEachRemovedItem((record) => {
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if (record.previousValue) {
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this._toggleClass(record.key, false);
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}
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});
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}
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private _applyArrayChanges(diff: IterableChanges): void {
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diff.forEachAddedItem((record) => { this._toggleClass(record.item, true); });
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diff.forEachRemovedItem((record) => { this._toggleClass(record.item, false); });
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}
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private _toggleClass(className: string, enabled): void {
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this._renderer.setElementClass(this._ngEl, className, enabled);
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}
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}
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