import { ContentChildren, Directive, ElementRef, Optional, QueryList, 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 2's `ngModel` or `FormBuilder` API. For an overview on how `FormBuilder` works, checkout [Angular 2 Forms](http://learnangular2.com/forms/), or [Angular FormBuilder](https://angular.io/docs/ts/latest/api/forms/index/FormBuilder-class.html)
*
*
* ```html
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* Friends
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* Enemies
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* ```
*
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* @demo /docs/v2/demos/src/segment/
* @see {@link /docs/v2/components#segment Segment Component Docs}
* @see [Angular 2 Forms](http://learnangular2.com/forms/)
*/
@Directive({
selector: 'ion-segment'
})
export class Segment extends BaseInput {
/**
* @hidden
*/
@ContentChildren(SegmentButton) _buttons: QueryList;
constructor(
config: Config,
elementRef: ElementRef,
renderer: Renderer,
@Optional() ngControl: NgControl
) {
super(config, elementRef, renderer, 'segment', null, null, ngControl);
}
/**
* @hidden
*/
ngAfterViewInit() {
this._initialize();
this._buttons.forEach(button => {
button.ionSelect.subscribe((selectedButton: any) => this.value = selectedButton.value);
});
}
/**
* @hidden
* Write a new value to the element.
*/
_inputUpdated() {
if (this._buttons) {
var buttons = this._buttons.toArray();
var value = this.value;
for (var button of buttons) {
button.isActive = (button.value === value);
}
}
}
}