import { Component, ContentChildren, Directive, ElementRef, EventEmitter, HostListener, Input, Output, Optional, QueryList, Renderer, ViewEncapsulation } from '@angular/core';
import { NgControl } from '@angular/forms';
import { Config } from '../../config/config';
import { Ion } from '../ion';
import { isPresent, isTrueProperty } from '../../util/util';
/**
* @name SegmentButton
* @description
* The child buttons of the `ion-segment` component. Each `ion-segment-button` must have a value.
*
* @usage
*
* ```html
*
*
*
*
*
*
*
*
*
*
*
*
*
*
* Friends
*
*
* Enemies
*
*
*
* ```
*
*
* @demo /docs/v2/demos/src/segment/
* @see {@link /docs/v2/components#segment Segment Component Docs}
* @see {@link /docs/v2/api/components/segment/Segment/ Segment API Docs}
*/
@Component({
selector: 'ion-segment-button',
template:
'' +
'',
host: {
'tappable': '',
'class': 'segment-button',
'role': 'button'
},
encapsulation: ViewEncapsulation.None,
})
export class SegmentButton {
_disabled: boolean = false;
/**
* @input {string} the value of the segment button. Required.
*/
@Input() value: string;
/**
* @output {SegmentButton} expression to evaluate when a segment button has been clicked
*/
@Output() ionSelect: EventEmitter = new EventEmitter();
constructor(private _renderer: Renderer, private _elementRef: ElementRef) {}
/**
* @input {boolean} disabled state of the button. Optional.
*/
@Input()
get disabled(): boolean {
return this._disabled;
}
set disabled(val: boolean) {
this._disabled = isTrueProperty(val);
this._setElementClass('segment-button-disabled', this._disabled);
}
/**
* @private
*/
_setElementClass(cssClass: string, shouldAdd: boolean) {
this._renderer.setElementClass(this._elementRef.nativeElement, cssClass, shouldAdd);
}
/**
* @private
* On click of a SegmentButton
*/
@HostListener('click')
onClick() {
console.debug('SegmentButton, select', this.value);
this.ionSelect.emit(this);
}
/**
* @private
*/
ngOnInit() {
if (!isPresent(this.value)) {
console.warn(' requires a "value" attribute');
}
}
/**
* @private
*/
set isActive(isActive: any) {
this._renderer.setElementClass(this._elementRef.nativeElement, 'segment-activated', isActive);
this._renderer.setElementAttribute(this._elementRef.nativeElement, 'aria-pressed', isActive);
}
}
/**
* @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
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
* Friends
*
*
* Enemies
*
*
*
*
*
*
* ```
*
*
* @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 Ion {
_disabled: boolean = false;
/**
* @private
*/
value: string;
/**
* @input {string} The predefined color to use. For example: `"primary"`, `"secondary"`, `"danger"`.
*/
@Input()
set color(val: string) {
this._setColor(val);
}
/**
* @input {string} The mode to apply to this component. Mode can be `ios`, `wp`, or `md`.
*/
@Input()
set mode(val: string) {
this._setMode( val);
}
/**
* @output {Any} expression to evaluate when a segment button has been changed
*/
@Output() ionChange: EventEmitter = new EventEmitter();
/**
* @private
*/
@ContentChildren(SegmentButton) _buttons: QueryList;
constructor(
config: Config,
elementRef: ElementRef,
renderer: Renderer,
@Optional() ngControl: NgControl
) {
super(config, elementRef, renderer, 'segment');
if (ngControl) {
ngControl.valueAccessor = this;
}
}
/**
* @private
*/
@Input()
get disabled(): boolean {
return this._disabled;
}
set disabled(val: boolean) {
this._disabled = isTrueProperty(val);
if (this._buttons) {
this._buttons.forEach(button => {
button._setElementClass('segment-button-disabled', this._disabled);
});
}
}
/**
* @private
* Write a new value to the element.
*/
writeValue(value: any) {
this.value = isPresent(value) ? value : '';
if (this._buttons) {
let buttons = this._buttons.toArray();
for (let button of buttons) {
button.isActive = (button.value === this.value);
}
}
}
/**
* @private
*/
ngAfterViewInit() {
this._buttons.forEach(button => {
button.ionSelect.subscribe((selectedButton: any) => {
this.writeValue(selectedButton.value);
this.onChange(selectedButton.value);
this.ionChange.emit(selectedButton);
});
if (isPresent(this.value)) {
button.isActive = (button.value === this.value);
}
if (isTrueProperty(this._disabled)) {
button._setElementClass('segment-button-disabled', this._disabled);
}
});
}
/**
* @private
*/
onChange = (_: any) => {};
/**
* @private
*/
onTouched = (_: any) => {};
/**
* @private
* Set the function to be called when the control receives a change event.
*/
registerOnChange(fn: any) { this.onChange = fn; }
/**
* @private
* Set the function to be called when the control receives a touch event.
*/
registerOnTouched(fn: any) { this.onTouched = fn; }
}