import { Component, ElementRef, EventEmitter, Input, NgZone, Output, ViewChild } from '@angular/core';
import { clamp } from '../../util/util';
import { Config } from '../../config/config';
import { DomController } from '../../platform/dom-controller';
import { Haptic } from '../../tap-click/haptic';
import { DECELERATION_FRICTION, FRAME_MS, MAX_PICKER_SPEED, PICKER_OPT_SELECTED } from './picker-options';
import { Platform } from '../../platform/platform';
import { pointerCoord } from '../../util/dom';
import { UIEventManager } from '../../gestures/ui-event-manager';
/**
* @hidden
*/
export class PickerColumnCmp {
constructor(config, _plt, elementRef, _zone, _haptic, plt, domCtrl) {
this._plt = _plt;
this.elementRef = elementRef;
this._zone = _zone;
this._haptic = _haptic;
this.y = 0;
this.pos = [];
this.startY = null;
this.ionChange = new EventEmitter();
this.events = new UIEventManager(plt);
this.rotateFactor = config.getNumber('pickerRotateFactor', 0);
this.scaleFactor = config.getNumber('pickerScaleFactor', 1);
this.decelerateFunc = this.decelerate.bind(this);
this.debouncer = domCtrl.debouncer();
}
ngAfterViewInit() {
// get the scrollable element within the column
let colEle = this.colEle.nativeElement;
this.colHeight = colEle.clientHeight;
// get the height of one option
this.optHeight = (colEle.firstElementChild ? colEle.firstElementChild.clientHeight : 0);
// Listening for pointer events
this.events.pointerEvents({
element: this.elementRef.nativeElement,
pointerDown: this.pointerStart.bind(this),
pointerMove: this.pointerMove.bind(this),
pointerUp: this.pointerEnd.bind(this),
capture: true,
zone: false
});
}
ngOnDestroy() {
this._plt.cancelRaf(this.rafId);
this.events.destroy();
}
pointerStart(ev) {
(void 0) /* console.debug */;
this._haptic.gestureSelectionStart();
// We have to prevent default in order to block scrolling under the picker
// but we DO NOT have to stop propagation, since we still want
// some "click" events to capture
ev.preventDefault();
// cancel any previous raf's that haven't fired yet
this._plt.cancelRaf(this.rafId);
// remember where the pointer started from`
this.startY = pointerCoord(ev).y;
// reset everything
this.velocity = 0;
this.pos.length = 0;
this.pos.push(this.startY, Date.now());
let options = this.col.options;
let minY = (options.length - 1);
let maxY = 0;
for (var i = 0; i < options.length; i++) {
if (!options[i].disabled) {
minY = Math.min(minY, i);
maxY = Math.max(maxY, i);
}
}
this.minY = (minY * this.optHeight * -1);
this.maxY = (maxY * this.optHeight * -1);
return true;
}
pointerMove(ev) {
ev.preventDefault();
ev.stopPropagation();
let currentY = pointerCoord(ev).y;
this.pos.push(currentY, Date.now());
this.debouncer.write(() => {
if (this.startY === null) {
return;
}
// update the scroll position relative to pointer start position
let y = this.y + (currentY - this.startY);
if (y > this.minY) {
// scrolling up higher than scroll area
y = Math.pow(y, 0.8);
this.bounceFrom = y;
}
else if (y < this.maxY) {
// scrolling down below scroll area
y += Math.pow(this.maxY - y, 0.9);
this.bounceFrom = y;
}
else {
this.bounceFrom = 0;
}
this.update(y, 0, false, false);
let currentIndex = Math.max(Math.abs(Math.round(y / this.optHeight)), 0);
if (currentIndex !== this.lastTempIndex) {
// Trigger a haptic event for physical feedback that the index has changed
this._haptic.gestureSelectionChanged();
this.lastTempIndex = currentIndex;
}
});
}
pointerEnd(ev) {
ev.preventDefault();
this.debouncer.cancel();
if (this.startY === null) {
return;
}
(void 0) /* console.debug */;
this.velocity = 0;
if (this.bounceFrom > 0) {
// bounce back up
this.update(this.minY, 100, true, true);
return;
}
else if (this.bounceFrom < 0) {
// bounce back down
this.update(this.maxY, 100, true, true);
return;
}
let endY = pointerCoord(ev).y;
this.pos.push(endY, Date.now());
let endPos = (this.pos.length - 1);
let startPos = endPos;
let timeRange = (Date.now() - 100);
// move pointer to position measured 100ms ago
for (var i = endPos; i > 0 && this.pos[i] > timeRange; i -= 2) {
startPos = i;
}
if (startPos !== endPos) {
// compute relative movement between these two points
var timeOffset = (this.pos[endPos] - this.pos[startPos]);
var movedTop = (this.pos[startPos - 1] - this.pos[endPos - 1]);
// based on XXms compute the movement to apply for each render step
var velocity = ((movedTop / timeOffset) * FRAME_MS);
this.velocity = clamp(-MAX_PICKER_SPEED, velocity, MAX_PICKER_SPEED);
}
if (Math.abs(endY - this.startY) > 3) {
var y = this.y + (endY - this.startY);
this.update(y, 0, true, true);
}
this.startY = null;
this.decelerate();
}
decelerate() {
let y = 0;
if (isNaN(this.y) || !this.optHeight) {
// fallback in case numbers get outta wack
this.update(y, 0, true, true);
this._haptic.gestureSelectionEnd();
}
else if (Math.abs(this.velocity) > 0) {
// still decelerating
this.velocity *= DECELERATION_FRICTION;
// do not let it go slower than a velocity of 1
this.velocity = (this.velocity > 0)
? Math.max(this.velocity, 1)
: Math.min(this.velocity, -1);
y = Math.round(this.y - this.velocity);
if (y > this.minY) {
// whoops, it's trying to scroll up farther than the options we have!
y = this.minY;
this.velocity = 0;
}
else if (y < this.maxY) {
// gahh, it's trying to scroll down farther than we can!
y = this.maxY;
this.velocity = 0;
}
var notLockedIn = (y % this.optHeight !== 0 || Math.abs(this.velocity) > 1);
this.update(y, 0, true, !notLockedIn);
if (notLockedIn) {
// isn't locked in yet, keep decelerating until it is
this.rafId = this._plt.raf(this.decelerateFunc);
}
}
else if (this.y % this.optHeight !== 0) {
// needs to still get locked into a position so options line up
var currentPos = Math.abs(this.y % this.optHeight);
// create a velocity in the direction it needs to scroll
this.velocity = (currentPos > (this.optHeight / 2) ? 1 : -1);
this._haptic.gestureSelectionEnd();
this.decelerate();
}
let currentIndex = Math.max(Math.abs(Math.round(y / this.optHeight)), 0);
if (currentIndex !== this.lastTempIndex) {
// Trigger a haptic event for physical feedback that the index has changed
this._haptic.gestureSelectionChanged();
}
this.lastTempIndex = currentIndex;
}
optClick(ev, index) {
if (!this.velocity) {
ev.preventDefault();
ev.stopPropagation();
this.setSelected(index, 150);
}
}
setSelected(selectedIndex, duration) {
// if there is a selected index, then figure out it's y position
// if there isn't a selected index, then just use the top y position
let y = (selectedIndex > -1) ? ((selectedIndex * this.optHeight) * -1) : 0;
this._plt.cancelRaf(this.rafId);
this.velocity = 0;
// so what y position we're at
this.update(y, duration, true, true);
}
update(y, duration, saveY, emitChange) {
// ensure we've got a good round number :)
y = Math.round(y);
let i;
let button;
let opt;
let optOffset;
let visible;
let translateX;
let translateY;
let translateZ;
let rotateX;
let transform;
let selected;
const parent = this.colEle.nativeElement;
const children = parent.children;
const length = children.length;
const selectedIndex = this.col.selectedIndex = Math.min(Math.max(Math.round(-y / this.optHeight), 0), length - 1);
const durationStr = (duration === 0) ? null : duration + 'ms';
const scaleStr = `scale(${this.scaleFactor})`;
for (i = 0; i < length; i++) {
button = children[i];
opt = this.col.options[i];
optOffset = (i * this.optHeight) + y;
visible = true;
transform = '';
if (this.rotateFactor !== 0) {
rotateX = optOffset * this.rotateFactor;
if (Math.abs(rotateX) > 90) {
visible = false;
}
else {
translateX = 0;
translateY = 0;
translateZ = 90;
transform = `rotateX(${rotateX}deg) `;
}
}
else {
translateX = 0;
translateZ = 0;
translateY = optOffset;
if (Math.abs(translateY) > 170) {
visible = false;
}
}
selected = selectedIndex === i;
if (visible) {
transform += `translate3d(0px,${translateY}px,${translateZ}px) `;
if (this.scaleFactor !== 1 && !selected) {
transform += scaleStr;
}
}
else {
transform = 'translate3d(-9999px,0px,0px)';
}
// Update transition duration
if (duration !== opt._dur) {
opt._dur = duration;
button.style[this._plt.Css.transitionDuration] = durationStr;
}
// Update transform
if (transform !== opt._trans) {
opt._trans = transform;
button.style[this._plt.Css.transform] = transform;
}
// Update selected item
if (selected !== opt._selected) {
opt._selected = selected;
if (selected) {
button.classList.add(PICKER_OPT_SELECTED);
}
else {
button.classList.remove(PICKER_OPT_SELECTED);
}
}
}
this.col.prevSelected = selectedIndex;
if (saveY) {
this.y = y;
}
if (emitChange) {
if (this.lastIndex === undefined) {
// have not set a last index yet
this.lastIndex = this.col.selectedIndex;
}
else if (this.lastIndex !== this.col.selectedIndex) {
// new selected index has changed from the last index
// update the lastIndex and emit that it has changed
this.lastIndex = this.col.selectedIndex;
var ionChange = this.ionChange;
if (ionChange.observers.length > 0) {
this._zone.run(ionChange.emit.bind(ionChange, this.col.options[this.col.selectedIndex]));
}
}
}
}
refresh() {
let min = this.col.options.length - 1;
let max = 0;
const options = this.col.options;
for (var i = 0; i < options.length; i++) {
if (!options[i].disabled) {
min = Math.min(min, i);
max = Math.max(max, i);
}
}
const selectedIndex = clamp(min, this.col.selectedIndex, max);
if (this.col.prevSelected !== selectedIndex) {
var y = (selectedIndex * this.optHeight) * -1;
this._plt.cancelRaf(this.rafId);
this.velocity = 0;
this.update(y, 150, true, false);
}
}
}
PickerColumnCmp.decorators = [
{ type: Component, args: [{
selector: '.picker-col',
template: '