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item-sliding.tsx
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item-sliding.tsx
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import { Component, ComponentInterface, Element, Event, EventEmitter, Method, Prop, QueueApi, State, Watch } from '@stencil/core';
import { Gesture, GestureDetail } from '../../interface';
const SWIPE_MARGIN = 30;
const ELASTIC_FACTOR = 0.55;
const enum ItemSide {
None = 0,
Start = 1 << 0,
End = 1 << 1,
Both = Start | End
}
const enum SlidingState {
Disabled = 1 << 1,
Enabled = 1 << 2,
End = 1 << 3,
Start = 1 << 4,
SwipeEnd = 1 << 5,
SwipeStart = 1 << 6,
}
let openSlidingItem: HTMLIonItemSlidingElement | undefined;
@Component({
tag: 'ion-item-sliding',
styleUrl: 'item-sliding.scss'
})
export class ItemSliding implements ComponentInterface {
private item: HTMLIonItemElement | null = null;
private openAmount = 0;
private initialOpenAmount = 0;
private optsWidthRightSide = 0;
private optsWidthLeftSide = 0;
private sides = ItemSide.None;
private tmr: number | undefined;
private leftOptions?: HTMLIonItemOptionsElement;
private rightOptions?: HTMLIonItemOptionsElement;
private optsDirty = true;
private gesture?: Gesture;
@Element() el!: HTMLIonItemSlidingElement;
@State() state: SlidingState = SlidingState.Disabled;
@Prop({ context: 'queue' }) queue!: QueueApi;
/**
* If `true`, the user cannot interact with the sliding-item.
*/
@Prop() disabled = false;
@Watch('disabled')
disabledChanged() {
if (this.gesture) {
this.gesture.setDisabled(this.disabled);
}
}
/**
* Emitted when the sliding position changes.
*/
@Event() ionDrag!: EventEmitter;
async componentDidLoad() {
this.item = this.el.querySelector('ion-item');
await this.updateOptions();
this.gesture = (await import('../../utils/gesture')).createGesture({
el: this.el,
queue: this.queue,
gestureName: 'item-swipe',
gesturePriority: 100,
threshold: 5,
canStart: () => this.canStart(),
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;
}
this.item = null;
this.leftOptions = this.rightOptions = undefined;
if (openSlidingItem === this.el) {
openSlidingItem = undefined;
}
}
/**
* Get the amount the item is open in pixels.
*/
@Method()
getOpenAmount(): Promise<number> {
return Promise.resolve(this.openAmount);
}
/**
* Get the ratio of the open amount of the item compared to the width of the options.
* If the number returned is positive, then the options on the right side are open.
* If the number returned is negative, then the options on the left side are open.
* If the absolute value of the number is greater than 1, the item is open more than
* the width of the options.
*/
@Method()
getSlidingRatio(): Promise<number> {
return Promise.resolve(this.getSlidingRatioSync());
}
/**
* Open the sliding item.
*/
@Method()
async open() {
const options = this.el.querySelector('ion-item-options');
if (options) {
options.style.display = 'flex';
const width = options.offsetWidth;
openSlidingItem = this.el;
options.style.display = '';
this.setOpenAmount(width, true);
}
}
/**
* Close the sliding item. Items can also be closed from the [List](../../list/List).
*/
@Method()
async close() {
this.setOpenAmount(0, true);
}
/**
* Close all of the sliding items in the list. Items can also be closed from the [List](../../list/List).
*/
@Method()
async closeOpened(): Promise<boolean> {
if (openSlidingItem !== undefined) {
openSlidingItem.close();
openSlidingItem = undefined;
return true;
}
return false;
}
private async updateOptions() {
const options = this.el.querySelectorAll('ion-item-options');
let sides = 0;
// Reset left and right options in case they were removed
this.leftOptions = this.rightOptions = undefined;
for (let i = 0; i < options.length; i++) {
const option = await options.item(i).componentOnReady();
if (option.side === 'start') {
this.leftOptions = option;
sides |= ItemSide.Start;
} else {
this.rightOptions = option;
sides |= ItemSide.End;
}
}
this.optsDirty = true;
this.sides = sides;
}
private canStart(): boolean {
const selected = openSlidingItem;
if (selected && selected !== this.el) {
this.closeOpened();
return false;
}
return !!(this.rightOptions || this.leftOptions);
}
private onStart() {
openSlidingItem = this.el;
if (this.tmr !== undefined) {
clearTimeout(this.tmr);
this.tmr = undefined;
}
if (this.openAmount === 0) {
this.optsDirty = true;
this.state = SlidingState.Enabled;
}
this.initialOpenAmount = this.openAmount;
if (this.item) {
this.item.style.transition = 'none';
}
}
private onMove(gesture: GestureDetail) {
if (this.optsDirty) {
this.calculateOptsWidth();
}
let openAmount = this.initialOpenAmount - gesture.deltaX;
switch (this.sides) {
case ItemSide.End: openAmount = Math.max(0, openAmount); break;
case ItemSide.Start: openAmount = Math.min(0, openAmount); break;
case ItemSide.Both: break;
case ItemSide.None: return;
default: console.warn('invalid ItemSideFlags value', this.sides); break;
}
let optsWidth;
if (openAmount > this.optsWidthRightSide) {
optsWidth = this.optsWidthRightSide;
openAmount = optsWidth + (openAmount - optsWidth) * ELASTIC_FACTOR;
} else if (openAmount < -this.optsWidthLeftSide) {
optsWidth = -this.optsWidthLeftSide;
openAmount = optsWidth + (openAmount - optsWidth) * ELASTIC_FACTOR;
}
this.setOpenAmount(openAmount, false);
}
private onEnd(gesture: GestureDetail) {
const velocity = gesture.velocityX;
let restingPoint = (this.openAmount > 0)
? this.optsWidthRightSide
: -this.optsWidthLeftSide;
// Check if the drag didn't clear the buttons mid-point
// and we aren't moving fast enough to swipe open
const isResetDirection = (this.openAmount > 0) === !(velocity < 0);
const isMovingFast = Math.abs(velocity) > 0.3;
const isOnCloseZone = Math.abs(this.openAmount) < Math.abs(restingPoint / 2);
if (swipeShouldReset(isResetDirection, isMovingFast, isOnCloseZone)) {
restingPoint = 0;
}
const state = this.state;
this.setOpenAmount(restingPoint, true);
if ((state & SlidingState.SwipeEnd) !== 0 && this.rightOptions) {
this.rightOptions.fireSwipeEvent();
} else if ((state & SlidingState.SwipeStart) !== 0 && this.leftOptions) {
this.leftOptions.fireSwipeEvent();
}
}
private calculateOptsWidth() {
this.optsWidthRightSide = 0;
if (this.rightOptions) {
this.optsWidthRightSide = this.rightOptions.offsetWidth;
}
this.optsWidthLeftSide = 0;
if (this.leftOptions) {
this.optsWidthLeftSide = this.leftOptions.offsetWidth;
}
this.optsDirty = false;
}
private setOpenAmount(openAmount: number, isFinal: boolean) {
if (this.tmr !== undefined) {
clearTimeout(this.tmr);
this.tmr = undefined;
}
if (!this.item) {
return;
}
const style = this.item.style;
this.openAmount = openAmount;
if (isFinal) {
style.transition = '';
}
if (openAmount > 0) {
this.state = (openAmount >= (this.optsWidthRightSide + SWIPE_MARGIN))
? SlidingState.End | SlidingState.SwipeEnd
: SlidingState.End;
} else if (openAmount < 0) {
this.state = (openAmount <= (-this.optsWidthLeftSide - SWIPE_MARGIN))
? SlidingState.Start | SlidingState.SwipeStart
: SlidingState.Start;
} else {
this.tmr = setTimeout(() => {
this.state = SlidingState.Disabled;
this.tmr = undefined;
}, 600) as any;
openSlidingItem = undefined;
style.transform = '';
return;
}
style.transform = `translate3d(${-openAmount}px,0,0)`;
this.ionDrag.emit({
amount: openAmount,
ratio: this.getSlidingRatioSync()
});
}
private getSlidingRatioSync(): number {
if (this.openAmount > 0) {
return this.openAmount / this.optsWidthRightSide;
} else if (this.openAmount < 0) {
return this.openAmount / this.optsWidthLeftSide;
} else {
return 0;
}
}
hostData() {
return {
class: {
'item-sliding-active-slide': (this.state !== SlidingState.Disabled),
'item-sliding-active-options-end': (this.state & SlidingState.End) !== 0,
'item-sliding-active-options-start': (this.state & SlidingState.Start) !== 0,
'item-sliding-active-swipe-end': (this.state & SlidingState.SwipeEnd) !== 0,
'item-sliding-active-swipe-start': (this.state & SlidingState.SwipeStart) !== 0
}
};
}
}
function swipeShouldReset(isResetDirection: boolean, isMovingFast: boolean, isOnResetZone: boolean): boolean {
// The logic required to know when the sliding item should close (openAmount=0)
// depends on three booleans (isResetDirection, isMovingFast, isOnResetZone)
// and it ended up being too complicated to be written manually without errors
// so the truth table is attached below: (0=false, 1=true)
// isResetDirection | isMovingFast | isOnResetZone || shouldClose
// 0 | 0 | 0 || 0
// 0 | 0 | 1 || 1
// 0 | 1 | 0 || 0
// 0 | 1 | 1 || 0
// 1 | 0 | 0 || 0
// 1 | 0 | 1 || 1
// 1 | 1 | 0 || 1
// 1 | 1 | 1 || 1
// The resulting expression was generated by resolving the K-map (Karnaugh map):
return (!isMovingFast && isOnResetZone) || (isResetDirection && isMovingFast);
}