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import { Component, EventEmitter, Input, Output, forwardRef, OnChanges, SimpleChanges, OnInit, ElementRef, ViewChild, AfterViewInit, HostListener, Renderer } from '@angular/core';
import { IDropDownOption, DropDownOptionType, DropDownTypes } from "./dropdown-models";
import { ValidatableComponent } from './../validation/validatable.component';
import template from './dropdown.component.html';
@Component({
selector: 'sdc-dropdown',
template: template
})
export class DropDownComponent extends ValidatableComponent implements OnChanges, OnInit {
@Output('changed') changeEmitter:EventEmitter<IDropDownOption> = new EventEmitter<IDropDownOption>();
@Input() label: string;
@Input() options: IDropDownOption[];
@Input() disabled: boolean;
@Input() placeHolder: string;
@Input() required: boolean;
@Input() maxHeight: number;
@Input() selectedOption: IDropDownOption;
@Input() type: DropDownTypes = DropDownTypes.Regular;
@ViewChild('dropDownWrapper') dropDownWrapper: ElementRef;
@ViewChild('optionsContainerElement') optionsContainerElement: ElementRef;
@HostListener('document:click', ['$event']) onClick(e) {
this.onClickDocument(e);
}
private bottomVisible = true;
private myRenderer: Renderer;
// Drop-down show/hide flag. default is false (closed)
public show = false;
// Export DropDownOptionType enum so we can use it on the template
public cIDropDownOptionType = DropDownOptionType;
public cIDropDownTypes = DropDownTypes;
// Configure unselectable option types
private unselectableOptions = [
DropDownOptionType.Disable,
DropDownOptionType.Header,
DropDownOptionType.HorizontalLine
];
// Set or unset Group style on drop-down
public isGroupDesign = false;
public animation_init = false;
public allOptions: IDropDownOption[];
public filterValue: string;
constructor(public renderer: Renderer) {
super();
this.myRenderer = renderer;
this.maxHeight = 244;
this.filterValue = '';
}
ngOnInit(): void {
if (this.options) {
this.allOptions = this.options;
if (this.options.find(option => option.type === DropDownOptionType.Header)) {
this.isGroupDesign = true;
}
}
}
ngOnChanges(changes: SimpleChanges): void {
console.log("ngOnChanges");
if (changes.selectedOption && changes.selectedOption.currentValue !== changes.selectedOption.previousValue) {
if (typeof changes.selectedOption.currentValue === 'string' && this.isSelectable(changes.selectedOption.currentValue)) {
this.setSelected(changes.selectedOption.currentValue);
} else if (this.isSelectable(changes.selectedOption.currentValue.value)) {
this.setSelected(changes.selectedOption.currentValue.value);
} else {
this.setSelected(undefined);
}
}
}
public getValue(): any {
return this.selectedOption && this.selectedOption.value;
}
public selectOption = (option: IDropDownOption | string, event?): void => {
if (event) { event.stopPropagation(); }
if (this.type === DropDownTypes.Headless) {
// Hide the options when in headless mode and user select option.
this.myRenderer.setElementStyle(this.dropDownWrapper.nativeElement, 'display', 'none');
}
if (typeof option === 'string' && this.isSelectable(option)) {
this.setSelected(option);
} else if (this.isSelectable((option as IDropDownOption).value)) {
this.setSelected((option as IDropDownOption).value);
}
}
public toggleDropdown = (event?): void => {
if (event) { event.stopPropagation(); }
if (this.type === DropDownTypes.Headless) {
// Show the options when in headless mode.
this.myRenderer.setElementStyle(this.dropDownWrapper.nativeElement, 'display', 'block');
}
if (this.disabled) { return; }
this.animation_init = true;
this.bottomVisible = this.isBottomVisible();
this.show = !this.show;
}
public filterOptions = (filterValue): void => {
if (filterValue.length >= 1 && !this.show) { this.toggleDropdown(); }
if (this.selectedOption) { this.selectedOption = null; }
this.options = this.allOptions.filter((option) => {
return option.value.toLowerCase().indexOf(filterValue.toLowerCase()) > -1;
});
}
private isSelectable = (value: string): boolean => {
const option: IDropDownOption = this.options.find(o => o.value === value);
if (!option) { return false; }
if (!option.type) { return true; }
return !this.unselectableOptions.find(optionType => optionType === option.type);
}
private setSelected = (value: string): void => {
this.selectedOption = this.options.find(o => o.value === value);
if (this.type === DropDownTypes.Auto) { this.filterValue = value; }
this.show = false;
this.changeEmitter.next(this.selectedOption);
}
private isBottomVisible = (): boolean => {
const windowPos = window.innerHeight + window.pageYOffset;
const boundingRect = this.dropDownWrapper.nativeElement.getBoundingClientRect();
const dropDownPos = boundingRect.top + boundingRect.height + this.maxHeight;
return windowPos > dropDownPos;
}
private onClickDocument = (event): void => {
if (this.type === DropDownTypes.Headless) {
if (!this.optionsContainerElement.nativeElement.contains(event.target)) {
this.show = false;
}
} else {
if (!this.dropDownWrapper.nativeElement.contains(event.target)) {
this.show = false;
}
}
}
}
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