/
PopupMenu.tsx
86 lines (77 loc) · 3.2 KB
/
PopupMenu.tsx
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namespace Demo.Views {
export interface PopupMenuProps extends UIBuilder.Props<PopupMenu> {
onMenuItemSelected: (item: HTMLElement) => void;
}
export class PopupMenu extends UIBuilder.Component<PopupMenuProps> {
private el: HTMLElement;
constructor(props: PopupMenuProps) {
super(props);
}
private onFocus(): void {
const items = Array.from(this.el.querySelectorAll('.menu-item'));
items.forEach(item => item.classList.remove('current'));
items[0].classList.add('current');
}
private onBlur(): void {
this.el.classList.add("hidden");
}
private setCurrentItem(index: number): void {
const items = Array.from(this.el.querySelectorAll('.menu-item'));
items.forEach(item => item.classList.remove('current'));
if (index !== -1)
items[index].classList.add('current');
}
private onKeyDown(event: KeyboardEvent): void {
const items = Array.from(this.el.querySelectorAll('.menu-item'));
const current = this.el.querySelector('.current') as HTMLElement;
let currentIndex = items.indexOf(current);
switch (event.keyCode) {
case KeyCodes.DownArrow:
currentIndex = (currentIndex === -1 || currentIndex === items.length - 1) ? 0 : (currentIndex + 1);
this.setCurrentItem(currentIndex);
break;
case KeyCodes.UpArrow:
currentIndex = (currentIndex === -1 || currentIndex === 0) ? (items.length - 1) : (currentIndex - 1);
this.setCurrentItem(currentIndex);
break;
case KeyCodes.Escape:
this.el.classList.add('hidden');
break;
case KeyCodes.Enter:
if (current) {
this.el.classList.add('hidden');
this.props.onMenuItemSelected(current);
}
break;
}
event.preventDefault();
}
private onMouseOver(event: Event): void {
const item = event.target as HTMLElement;
if (item.classList.contains('menu-item')) {
this.setCurrentItem(-1);
item.classList.add('current');
}
}
private onClick(event: Event): void {
const item = event.target as HTMLElement;
if (item.classList.contains('menu-item')) {
this.el.classList.add('hidden');
this.props.onMenuItemSelected(item);
}
}
public render(): JSX.Element {
return (
<div className="popup-menu" tabIndex="0"
ref={el => this.el = el}
onFocus={() => this.onFocus()}
onBlur={() => this.onBlur()}
onKeyDown={ev => this.onKeyDown(ev)}
onMouseOver={ev => this.onMouseOver(ev)}
onClick={ev => this.onClick(ev)}>
{this.props.children}
</div>
);
}
}
}