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| /*
* @license
* Copyright Hôpitaux Universitaires de Genève. All Rights Reserved.
*
* Use of this source code is governed by an Apache-2.0 license that can be
* found in the LICENSE file at https://github.com/DSI-HUG/dejajs-components/blob/master/LICENSE
*/
import { coerceBooleanProperty } from '@angular/cdk/coercion';
import { ChangeDetectionStrategy, ChangeDetectorRef, Component, ContentChild, ElementRef, EventEmitter, HostListener, Input, Optional, Output, Self } from '@angular/core';
import { ControlValueAccessor, NgControl } from '@angular/forms';
import { fromEvent as observableFromEvent, merge as observableMerge } from 'rxjs';
import { first, takeUntil, tap } from 'rxjs/operators';
import { IRange, IRangeEvent, IStepRangeEvent, Range } from './range.interface';
const noop = () => { };
@Component({
changeDetection: ChangeDetectionStrategy.OnPush,
selector: 'deja-range',
styles: [require('./range.component.scss')],
template: require('./range.component.html'),
})
export class DejaRangeComponent implements ControlValueAccessor {
// step can be either a numeric value, an array of accepted intervals or a function returning the next accepted interval
@Input() public step: number | number[] | ((event: IStepRangeEvent) => number) = 1;
// index of the selected range
@Input() public selected = 0;
// emit the selected range
@Output() public select: EventEmitter<any> = new EventEmitter();
// error emitter, used to notify the outside when forbidden actions are performed
@Output() public errorFeedback: EventEmitter<any> = new EventEmitter();
// custom templates
@ContentChild('rangeTemplate') protected rangeTemplate: any;
@ContentChild('separatorTemplate') protected separatorTemplate: any;
// minimum range percentage, used to avoid 2 separator being on the same visual space
private minimumRangePercentage = 0.01;
private _readOnly = true;
private _disabled = false;
private _ranges: IRange[];
public _onChangeCallback: (_: any) => void = noop;
public _onTouchCallback: () => void = noop;
public registerOnChange(fn: any): void { this._onChangeCallback = fn; }
public registerOnTouched(fn: any): void { this._onTouchCallback = fn; }
// inner model
public get ranges(): IRange[] {
return this._ranges || [];
}
public set ranges(ranges: IRange[]) {
if (!!ranges) {
this.writeValue(ranges);
this._onChangeCallback(ranges);
}
}
// read / write mode
@Input()
public set disabled(value: boolean | string) {
this._disabled = coerceBooleanProperty(value);
this.changeDetectorRef.markForCheck();
}
public get disabled() {
return this._disabled;
}
// read / write mode
@Input()
public set readOnly(value: boolean | string) {
this._readOnly = coerceBooleanProperty(value);
}
public get readOnly() {
return this._readOnly || this.disabled;
}
constructor(private changeDetectorRef: ChangeDetectorRef, private elementRef: ElementRef, @Self() @Optional() public _control: NgControl) {
if (this._control) {
this._control.valueAccessor = this;
}
}
// ControlValueAccessor implementation
public writeValue(ranges: IRange[]): void {
if (!!ranges && !!ranges.length) {
const host = this.elementRef.nativeElement.firstElementChild as HTMLElement;
const hostWidth = host.getBoundingClientRect().width;
const totalDifference = ranges[ranges.length - 1].max - ranges[0].min;
this._ranges = ranges.map((range, index) => {
// calculate new width
const difference = ranges[index].max - ranges[index].min;
const modelPercent = totalDifference / 100;
const percent = difference / modelPercent;
const viewValue = hostWidth * percent / 100;
range.$width = +viewValue.toFixed(2);
return range;
});
this.changeDetectorRef.markForCheck();
}
}
public setDisabledState(isDisabled: boolean) {
this.disabled = isDisabled;
}
// End of ControlValueAccessor implementation
@HostListener('window:resize', ['$event'])
public onResize() {
this.ranges = this.ranges.concat();
}
// add a new range, by splitting the selected one into 2 new ranges
public add(): void {
if (!this.readOnly) {
if (typeof this.step === 'number') {
const ranges = this.ranges;
const index = this.selected;
const selected = ranges[index];
const difference = selected.max - selected.min;
const totalDifference = ranges[ranges.length - 1].max - ranges[0].min;
const minimumViewDifference = this.minimumRangePercentage * 2;
const modelDifferencePercentage = difference / totalDifference;
const isViewDifferenceEnough = modelDifferencePercentage > minimumViewDifference;
let newMax;
let newRange;
const isModelDifferenceEnough = difference >= this.step * 2;
if (isViewDifferenceEnough && isModelDifferenceEnough) {
newMax = selected.min + difference / 2;
newRange = new Range(selected.min, newMax);
selected.min = newMax;
// split array in half excluding the selected range
const leftSide = ranges.slice(0, index);
const rightSide = ranges.length - 1 > index ? ranges.slice(index + 1) : [];
// build new array with new range
let newRanges = [...leftSide, newRange, selected, ...rightSide];
// step
const newRangeIndex = newRanges.indexOf(newRange);
newRanges[newRangeIndex].max = this.toStep(newRanges, newRangeIndex, newRanges[newRangeIndex].max);
newRanges = newRanges
.map((range: IRange, _index: number) => {
if (_index !== 0) {
range.min = newRanges[_index - 1].max;
}
return range;
});
this.ranges = newRanges;
} else {
this.errorFeedback.emit(new Error('Range is too small to be splitted'));
}
} else {
throw new Error('Invalid step type, you have to implement the add function yourself for the fn & array.');
}
}
}
// remove the select range
public remove(): void {
if (!this.readOnly && this.ranges.length > 2) {
const ranges = this.ranges
.filter((_range: IRange, index: number) => this.selected !== index);
this.ranges = ranges
.map((range: IRange, index: number) => {
if (index !== ranges.length - 1) {
range.max = ranges[index + 1].min;
}
return range;
});
}
}
/** Force control to rebind */
public refresh() {
this.changeDetectorRef.markForCheck();
}
// set the new selected index and emit a IRangeEvent
protected onSelect(e: Event, index: number): void {
if (this.disabled) {
return;
}
if (this.selected !== index) {
const event = e as IRangeEvent;
event.range = this.ranges[index];
event.index = index;
event.ranges = this.ranges;
this.select.emit(event);
this.selected = index;
}
}
protected onMouseDown($event: MouseEvent, index: number): void {
if (!this.readOnly) {
const xStart = $event.pageX;
const target = $event.target as HTMLElement;
const ranges = this.ranges;
const range = this.ranges[index];
const rangeStart = range.max;
// get the block HTMLElement (contains range HTMLElement & separator HTMLElement)
let parentElement = target.parentElement;
while (!parentElement.classList.contains('block')) {
parentElement = parentElement.parentElement;
}
const up$ = observableFromEvent(document, 'mouseup');
const leave$ = observableFromEvent(document.body, 'mouseleave');
const kill$ = observableMerge(up$, leave$).pipe(
first(),
tap(() => {
const host = this.elementRef.nativeElement.firstElementChild as HTMLElement;
host.ownerDocument.body.classList.remove('noselect');
this._onChangeCallback(this._ranges);
}));
observableFromEvent(document, 'mousemove').pipe(
takeUntil(kill$))
.subscribe((event: MouseEvent) => {
const x = event.pageX;
const xDifference = -(xStart - x);
const nextRange = this.ranges[index + 1];
// compute total difference
const totalDifference = ranges[ranges.length - 1].max - ranges[0].min;
// calculate new width of the range, get host width
const host = this.elementRef.nativeElement.firstElementChild as HTMLElement;
const hostWidth = host.getBoundingClientRect().width;
// avoid drag
host.ownerDocument.body.classList.add('noselect');
// compute new model value
const modelDifference = xDifference * totalDifference / hostWidth;
let newMax = rangeStart + modelDifference;
const minDifference = this.minimumRangePercentage * totalDifference;
const min = range.min + minDifference;
const max = nextRange.max - minDifference;
newMax = Math.min(newMax, max);
newMax = Math.max(newMax, min);
const newStepped = this.toStep(ranges, index, newMax);
nextRange.min = range.max = newStepped;
ranges[index] = range;
ranges[index + 1] = nextRange;
this.writeValue(ranges);
});
}
}
private toStep(ranges: IRange[], index: number, newMax: number): number {
const range = ranges[index];
const maybeNextIndex = ranges.length - 1 > index ? index + 1 : index;
const nextMax = ranges[maybeNextIndex].max;
const previousMax = index !== 0 ? ranges[index - 1].max : 0;
const totalDifference = ranges[ranges.length - 1].max - ranges[0].min;
const minimumViewDifference = this.minimumRangePercentage * totalDifference;
const viewMin = range.min + minimumViewDifference;
const viewMax = nextMax - minimumViewDifference;
if (typeof this.step === 'number') {
const numericStep = this.step as number;
const precision = 100 / (numericStep * 100);
const steppedValue = (Math.round(newMax * precision) / precision);
const mantisseLength = numericStep
.toString()
.replace(/[0-9]+\./, '')
.length;
const fixedValue = +steppedValue.toFixed(mantisseLength);
const modelMax = Math.min(fixedValue, nextMax - numericStep);
const modelMin = Math.max(fixedValue, previousMax + numericStep);
const min = viewMin < modelMin ? modelMin : viewMin;
const max = viewMax > modelMax ? modelMax : viewMax;
const bestValue = newMax > range.max ? max : min;
return bestValue;
} else if (typeof this.step === 'function') {
const event = {} as IStepRangeEvent;
event.range = this.ranges[index];
event.index = index;
event.ranges = this.ranges;
event.newMax = newMax;
return this.step(event);
} else if (this.step instanceof Array) {
let idealValue = newMax;
let bestDiff: number;
this.step
.filter((value) => value <= viewMax && value >= viewMin)
.forEach((value) => {
const diff = Math.abs(value - newMax);
if (bestDiff === undefined || bestDiff > diff) {
idealValue = value;
bestDiff = diff;
}
});
return idealValue;
} else { throw new Error('Invalid step type.'); }
}
}
|