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toggle.tsx
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toggle.tsx
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import { Component, ComponentInterface, Element, Event, EventEmitter, Listen, Prop, QueueApi, State, Watch } from '@stencil/core';
import { Color, Gesture, GestureDetail, Mode, StyleEventDetail, ToggleChangeEventDetail } from '../../interface';
import { hapticSelection } from '../../utils/haptic';
import { findItemLabel, renderHiddenInput } from '../../utils/helpers';
import { createColorClasses, hostContext } from '../../utils/theme';
@Component({
tag: 'ion-toggle',
styleUrls: {
ios: 'toggle.ios.scss',
md: 'toggle.md.scss'
},
shadow: true
})
export class Toggle implements ComponentInterface {
private inputId = `ion-tg-${toggleIds++}`;
private gesture?: Gesture;
private buttonEl?: HTMLElement;
private lastDrag = 0;
@Element() el!: HTMLElement;
@Prop({ context: 'queue' }) queue!: QueueApi;
@Prop({ context: 'document' }) doc!: Document;
@State() activated = false;
/**
* The mode determines which platform styles to use.
*/
@Prop() mode!: Mode;
/**
* The color to use from your application's color palette.
* Default options are: `"primary"`, `"secondary"`, `"tertiary"`, `"success"`, `"warning"`, `"danger"`, `"light"`, `"medium"`, and `"dark"`.
* For more information on colors, see [theming](/docs/theming/basics).
*/
@Prop() color?: Color;
/**
* The name of the control, which is submitted with the form data.
*/
@Prop() name: string = this.inputId;
/**
* If `true`, the toggle is selected.
*/
@Prop({ mutable: true }) checked = false;
/**
* If `true`, the user cannot interact with the toggle.
*/
@Prop() disabled = false;
/**
* The value of the toggle does not mean if it's checked or not, use the `checked`
* property for that.
*
* The value of a toggle is analogous to the value of a `<input type="checkbox">`,
* it's only used when the toggle participates in a native `<form>`.
*/
@Prop() value?: string | null = 'on';
/**
* Emitted when the value property has changed.
*/
@Event() ionChange!: EventEmitter<ToggleChangeEventDetail>;
/**
* Emitted when the toggle has focus.
*/
@Event() ionFocus!: EventEmitter<void>;
/**
* Emitted when the toggle loses focus.
*/
@Event() ionBlur!: EventEmitter<void>;
/**
* Emitted when the styles change.
* @internal
*/
@Event() ionStyle!: EventEmitter<StyleEventDetail>;
@Watch('checked')
checkedChanged(isChecked: boolean) {
this.ionChange.emit({
checked: isChecked,
value: this.value
});
}
@Watch('disabled')
disabledChanged() {
this.emitStyle();
if (this.gesture) {
this.gesture.setDisabled(this.disabled);
}
}
componentWillLoad() {
this.emitStyle();
}
async componentDidLoad() {
this.gesture = (await import('../../utils/gesture')).createGesture({
el: this.el,
queue: this.queue,
gestureName: 'toggle',
gesturePriority: 100,
threshold: 5,
passive: false,
onStart: () => this.onStart(),
onMove: ev => this.onMove(ev),
onEnd: ev => this.onEnd(ev),
});
this.disabledChanged();
}
componentDidUnload() {
if (this.gesture) {
this.gesture.destroy();
this.gesture = undefined;
}
}
@Listen('click')
onClick() {
if (this.lastDrag + 300 < Date.now()) {
this.checked = !this.checked;
}
}
private emitStyle() {
this.ionStyle.emit({
'interactive-disabled': this.disabled,
});
}
private onStart() {
this.activated = true;
// touch-action does not work in iOS
this.setFocus();
}
private onMove(detail: GestureDetail) {
if (shouldToggle(this.doc, this.checked, detail.deltaX, -10)) {
this.checked = !this.checked;
hapticSelection();
}
}
private onEnd(ev: GestureDetail) {
this.activated = false;
this.lastDrag = Date.now();
ev.event.preventDefault();
ev.event.stopImmediatePropagation();
}
private getValue() {
return this.value || '';
}
private setFocus() {
if (this.buttonEl) {
this.buttonEl.focus();
}
}
private onFocus = () => {
this.ionFocus.emit();
}
private onBlur = () => {
this.ionBlur.emit();
}
hostData() {
const { inputId, disabled, checked, activated, color, el } = this;
const labelId = inputId + '-lbl';
const label = findItemLabel(el);
if (label) {
label.id = labelId;
}
return {
'role': 'checkbox',
'aria-disabled': disabled ? 'true' : null,
'aria-checked': `${checked}`,
'aria-labelledby': labelId,
class: {
...createColorClasses(color),
'in-item': hostContext('ion-item', el),
'toggle-activated': activated,
'toggle-checked': checked,
'toggle-disabled': disabled,
'interactive': true
}
};
}
render() {
const value = this.getValue();
renderHiddenInput(true, this.el, this.name, (this.checked ? value : ''), this.disabled);
return [
<div class="toggle-icon">
<div class="toggle-inner"/>
</div>,
<button
type="button"
onFocus={this.onFocus}
onBlur={this.onBlur}
disabled={this.disabled}
ref={el => this.buttonEl = el}
>
</button>
];
}
}
function shouldToggle(doc: HTMLDocument, checked: boolean, deltaX: number, margin: number): boolean {
const isRTL = doc.dir === 'rtl';
if (checked) {
return (!isRTL && (margin > deltaX)) ||
(isRTL && (- margin < deltaX));
} else {
return (!isRTL && (- margin < deltaX)) ||
(isRTL && (margin > deltaX));
}
}
let toggleIds = 0;