var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") return Reflect.decorate(decorators, target, key, desc);
    switch (arguments.length) {
        case 2: return decorators.reduceRight(function(o, d) { return (d && d(o)) || o; }, target);
        case 3: return decorators.reduceRight(function(o, d) { return (d && d(target, key)), void 0; }, void 0);
        case 4: return decorators.reduceRight(function(o, d) { return (d && d(target, key, o)) || o; }, desc);
    }
};
var __metadata = (this && this.__metadata) || function (k, v) {
    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
import { isPresent, isString, isArray } from 'angular2/src/core/facade/lang';
import { Directive } from 'angular2/src/core/metadata';
import { ElementRef } from 'angular2/src/core/linker';
import { IterableDiffers, KeyValueDiffers } from 'angular2/src/core/change_detection';
import { Renderer } from 'angular2/src/core/render';
import { StringMapWrapper, isListLikeIterable } from 'angular2/src/core/facade/collection';
/**
 * The `NgClass` directive conditionally adds and removes CSS classes on an HTML element based on
 * an expression's evaluation result.
 *
 * The result of an expression evaluation is interpreted differently depending on type of
 * the expression evaluation result:
 * - `string` - all the CSS classes listed in a string (space delimited) are added
 * - `Array` - all the CSS classes (Array elements) are added
 * - `Object` - each key corresponds to a CSS class name while values are interpreted as expressions
 * evaluating to `Boolean`. If a given expression evaluates to `true` a corresponding CSS class
 * is added - otherwise it is removed.
 *
 * While the `NgClass` directive can interpret expressions evaluating to `string`, `Array`
 * or `Object`, the `Object`-based version is the most often used and has an advantage of keeping
 * all the CSS class names in a template.
 *
 * ### Example ([live demo](http://plnkr.co/edit/a4YdtmWywhJ33uqfpPPn?p=preview)):
 *
 * ```
 * import {Component, NgClass} from 'angular2/angular2';
 *
 * @Component({
 *   selector: 'toggle-button',
 *   inputs: ['isDisabled'],
 *   template: `
 *      <div class="button" [ng-class]="{active: isOn, disabled: isDisabled}"
 *          (click)="toggle(!isOn)">
 *          Click me!
 *      </div>`,
 *   styles: [`
 *     .button {
 *       width: 120px;
 *       border: medium solid black;
 *     }
 *
 *     .active {
 *       background-color: red;
 *    }
 *
 *     .disabled {
 *       color: gray;
 *       border: medium solid gray;
 *     }
 *   `]
 *   directives: [NgClass]
 * })
 * class ToggleButton {
 *   isOn = false;
 *   isDisabled = false;
 *
 *   toggle(newState) {
 *     if (!this.isDisabled) {
 *       this.isOn = newState;
 *     }
 *   }
 * }
 * ```
 */
export let NgClass = class {
    constructor(_iterableDiffers, _keyValueDiffers, _ngEl, _renderer) {
        this._iterableDiffers = _iterableDiffers;
        this._keyValueDiffers = _keyValueDiffers;
        this._ngEl = _ngEl;
        this._renderer = _renderer;
        this._initialClasses = [];
    }
    set initialClasses(v) {
        this._applyInitialClasses(true);
        this._initialClasses = isPresent(v) && isString(v) ? v.split(' ') : [];
        this._applyInitialClasses(false);
        this._applyClasses(this._rawClass, false);
    }
    set rawClass(v) {
        this._cleanupClasses(this._rawClass);
        if (isString(v)) {
            v = v.split(' ');
        }
        this._rawClass = v;
        if (isPresent(v)) {
            if (isListLikeIterable(v)) {
                this._differ = this._iterableDiffers.find(v).create(null);
                this._mode = 'iterable';
            }
            else {
                this._differ = this._keyValueDiffers.find(v).create(null);
                this._mode = 'keyValue';
            }
        }
        else {
            this._differ = null;
        }
    }
    doCheck() {
        if (isPresent(this._differ)) {
            var changes = this._differ.diff(this._rawClass);
            if (isPresent(changes)) {
                if (this._mode == 'iterable') {
                    this._applyIterableChanges(changes);
                }
                else {
                    this._applyKeyValueChanges(changes);
                }
            }
        }
    }
    onDestroy() { this._cleanupClasses(this._rawClass); }
    _cleanupClasses(rawClassVal) {
        this._applyClasses(rawClassVal, true);
        this._applyInitialClasses(false);
    }
    _applyKeyValueChanges(changes) {
        changes.forEachAddedItem((record) => { this._toggleClass(record.key, record.currentValue); });
        changes.forEachChangedItem((record) => { this._toggleClass(record.key, record.currentValue); });
        changes.forEachRemovedItem((record) => {
            if (record.previousValue) {
                this._toggleClass(record.key, false);
            }
        });
    }
    _applyIterableChanges(changes) {
        changes.forEachAddedItem((record) => { this._toggleClass(record.item, true); });
        changes.forEachRemovedItem((record) => { this._toggleClass(record.item, false); });
    }
    _applyInitialClasses(isCleanup) {
        this._initialClasses.forEach(className => this._toggleClass(className, !isCleanup));
    }
    _applyClasses(rawClassVal, isCleanup) {
        if (isPresent(rawClassVal)) {
            if (isArray(rawClassVal)) {
                rawClassVal.forEach(className => this._toggleClass(className, !isCleanup));
            }
            else if (rawClassVal instanceof Set) {
                rawClassVal.forEach(className => this._toggleClass(className, !isCleanup));
            }
            else {
                StringMapWrapper.forEach(rawClassVal, (expVal, className) => {
                    if (expVal)
                        this._toggleClass(className, !isCleanup);
                });
            }
        }
    }
    _toggleClass(className, enabled) {
        className = className.trim();
        if (className.length > 0) {
            this._renderer.setElementClass(this._ngEl, className, enabled);
        }
    }
};
NgClass = __decorate([
    Directive({ selector: '[ng-class]', inputs: ['rawClass: ng-class', 'initialClasses: class'] }), 
    __metadata('design:paramtypes', [IterableDiffers, KeyValueDiffers, ElementRef, Renderer])
], NgClass);
//# sourceMappingURL=ng_class.js.map