import { ContentChildren, Directive, ElementRef, Optional, Renderer } from '@angular/core';
import { NgControl } from '@angular/forms';
import { Config } from '../../config/config';
import { BaseInput } from '../../util/base-input';
import { SegmentButton } from './segment-button';
/**
 * @name Segment
 * @description
 * A Segment is a group of buttons, sometimes known as Segmented Controls, that allow the user to interact with a compact group of a number of controls.
 * Segments provide functionality similar to tabs, selecting one will unselect all others. You should use a tab bar instead of a segmented control when you want to let the user move back and forth between distinct pages in your app.
 * You could use Angular's `ngModel` or `FormBuilder` API. For an overview on how `FormBuilder` works, checkout [Angular Forms](http://learnangular2.com/forms/), or [Angular FormBuilder](https://angular.io/docs/ts/latest/api/forms/index/FormBuilder-class.html)
 *
 *
 * ```html
 * <!-- Segment in a header -->
 * <ion-header>
 *   <ion-toolbar>
 *     <ion-segment [(ngModel)]="icons" color="secondary">
 *       <ion-segment-button value="camera">
 *         <ion-icon name="camera"></ion-icon>
 *       </ion-segment-button>
 *       <ion-segment-button value="bookmark">
 *         <ion-icon name="bookmark"></ion-icon>
 *       </ion-segment-button>
 *     </ion-segment>
 *   </ion-toolbar>
 * </ion-header>
 *
 * <ion-content>
 *   <!-- Segment in content -->
 *   <ion-segment [(ngModel)]="relationship" color="primary" (ionChange)="segmentChanged($event)">
 *     <ion-segment-button value="friends">
 *       Friends
 *     </ion-segment-button>
 *     <ion-segment-button value="enemies">
 *       Enemies
 *     </ion-segment-button>
 *   </ion-segment>
 *
 *   <!-- Segment in a form -->
 *   <form [formGroup]="myForm">
 *     <ion-segment formControlName="mapStyle" color="danger">
 *       <ion-segment-button value="standard">
 *         Standard
 *       </ion-segment-button>
 *       <ion-segment-button value="hybrid">
 *         Hybrid
 *       </ion-segment-button>
 *       <ion-segment-button value="sat">
 *         Satellite
 *       </ion-segment-button>
 *     </ion-segment>
 *   </form>
 * </ion-content>
 * ```
 *
 *
 * @demo /docs/demos/src/segment/
 * @see {@link /docs/components#segment Segment Component Docs}
 * @see [Angular Forms](http://learnangular2.com/forms/)
 */
export class Segment extends BaseInput {
    constructor(config, elementRef, renderer, ngControl) {
        super(config, elementRef, renderer, 'segment', null, null, null, ngControl);
    }
    /**
     * @hidden
     */
    ngAfterContentInit() {
        this._initialize();
        this._buttons.forEach(button => {
            button.ionSelect.subscribe((selectedButton) => {
                this.value = selectedButton.value;
                this._fireTouched();
            });
        });
    }
    /**
     * @hidden
     * Write a new value to the element.
     */
    _inputUpdated() {
        if (!this._buttons) {
            (void 0) /* assert */;
            return;
        }
        const buttons = this._buttons.toArray();
        const value = this.value;
        for (var button of buttons) {
            button.isActive = (button.value === value);
        }
    }
}
Segment.decorators = [
    { type: Directive, args: [{
                selector: 'ion-segment',
                host: {
                    '[class.segment-disabled]': '_disabled'
                }
            },] },
];
/** @nocollapse */
Segment.ctorParameters = () => [
    { type: Config, },
    { type: ElementRef, },
    { type: Renderer, },
    { type: NgControl, decorators: [{ type: Optional },] },
];
Segment.propDecorators = {
    '_buttons': [{ type: ContentChildren, args: [SegmentButton,] },],
};
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