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import React = require("react");
import { ContextMenuItem, ContextMenuProps, OriginalMenuProps } from "./ContextMenuItem";
import { observable, action, computed } from "mobx";
import { observer } from "mobx-react";
import "./ContextMenu.scss";
import { library } from '@fortawesome/fontawesome-svg-core';
import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
import { faSearch, faCircle } from '@fortawesome/free-solid-svg-icons';
import Measure from "react-measure";
library.add(faSearch);
library.add(faCircle);
@observer
export class ContextMenu extends React.Component {
static Instance: ContextMenu;
@observable private _items: Array<ContextMenuProps> = [];
@observable private _pageX: number = 0;
@observable private _pageY: number = 0;
@observable private _display: boolean = false;
@observable private _searchString: string = "";
// afaik displaymenu can be called before all the items are added to the menu, so can't determine in displayMenu what the height of the menu will be
@observable private _yRelativeToTop: boolean = true;
@observable selectedIndex = -1;
@observable private _width: number = 0;
@observable private _height: number = 0;
constructor(props: Readonly<{}>) {
super(props);
ContextMenu.Instance = this;
}
@action
clearItems() {
this._items = [];
}
findByDescription = (target: string) => {
return this._items.find(menuItem => menuItem.description === target);
}
@action
addItem(item: ContextMenuProps) {
if (this._items.indexOf(item) === -1) {
this._items.push(item);
}
}
getItems() {
return this._items;
}
static readonly buffer = 20;
get pageX() {
const x = this._pageX;
if (x < 0) {
return 0;
}
const width = this._width;
if (x + width > window.innerWidth - ContextMenu.buffer) {
return window.innerWidth - ContextMenu.buffer - width;
}
return x;
}
get pageY() {
const y = this._pageY;
if (y < 0) {
return 0;
}
const height = this._height;
if (y + height > window.innerHeight - ContextMenu.buffer) {
return window.innerHeight - ContextMenu.buffer - height;
}
return y;
}
@action
displayMenu(x: number, y: number) {
//maxX and maxY will change if the UI/font size changes, but will work for any amount
//of items added to the menu
this._pageX = x;
this._pageY = y;
this._searchString = "";
this._display = true;
}
@action
closeMenu = () => {
this.clearItems();
this._display = false;
}
@computed get filteredItems(): (OriginalMenuProps | string[])[] {
const searchString = this._searchString.toLowerCase().split(" ");
const matches = (descriptions: string[]): boolean => {
return searchString.every(s => descriptions.some(desc => desc.toLowerCase().includes(s)));
};
const flattenItems = (items: ContextMenuProps[], groupFunc: (groupName: any) => string[]) => {
let eles: (OriginalMenuProps | string[])[] = [];
const leaves: OriginalMenuProps[] = [];
for (const item of items) {
const description = item.description;
const path = groupFunc(description);
if ("subitems" in item) {
const children = flattenItems(item.subitems, name => [...groupFunc(description), name]);
if (children.length || matches(path)) {
eles.push(path);
eles = eles.concat(children);
}
} else {
if (!matches(path)) {
continue;
}
leaves.push(item);
}
}
eles = [...leaves, ...eles];
return eles;
};
return flattenItems(this._items, name => [name]);
}
@computed get flatItems(): OriginalMenuProps[] {
return this.filteredItems.filter(item => !Array.isArray(item)) as OriginalMenuProps[];
}
@computed get filteredViews() {
const createGroupHeader = (contents: any) => {
return (
<div className="contextMenu-group">
<div className="contextMenu-description">{contents}</div>
</div>
);
};
const createItem = (item: ContextMenuProps, selected: boolean) => <ContextMenuItem {...item} key={item.description} closeMenu={this.closeMenu} selected={selected} />;
let itemIndex = 0;
return this.filteredItems.map(value => {
if (Array.isArray(value)) {
return createGroupHeader(value.join(" -> "));
} else {
return createItem(value, itemIndex++ === this.selectedIndex);
}
});
}
@computed get menuItems() {
if (!this._searchString) {
return this._items.map(item => <ContextMenuItem {...item} key={item.description} closeMenu={this.closeMenu} />);
}
return this.filteredViews;
}
render() {
if (!this._display) {
return null;
}
let style = this._yRelativeToTop ? { left: this.pageX, top: this.pageY } :
{ left: this.pageX, bottom: this.pageY };
const contents = (
<>
<span className={"search-icon"}>
<span className="icon-background">
<FontAwesomeIcon icon="search" size="lg" />
</span>
<input className="contextMenu-item contextMenu-description search" type="text" placeholder="Search . . ." value={this._searchString} onKeyDown={this.onKeyDown} onChange={this.onChange} autoFocus />
</span>
{this.menuItems}
</>
);
return (
<Measure offset onResize={action((r: any) => { this._width = r.offset.width; this._height = r.offset.height; })}>
{({ measureRef }) => (
<div className="contextMenu-cont" style={style} ref={measureRef}>
{contents}
</div>
)
}
</Measure>
);
}
@action
onKeyDown = (e: React.KeyboardEvent) => {
if (e.key === "ArrowDown") {
if (this.selectedIndex < this.flatItems.length - 1) {
this.selectedIndex++;
}
e.preventDefault();
} else if (e.key === "ArrowUp") {
if (this.selectedIndex > 0) {
this.selectedIndex--;
}
e.preventDefault();
} else if (e.key === "Enter") {
const item = this.flatItems[this.selectedIndex];
item.event();
this.closeMenu();
}
}
@action
onChange = (e: React.ChangeEvent<HTMLInputElement>) => {
this._searchString = e.target.value;
if (!this._searchString) {
this.selectedIndex = -1;
}
else {
if (this.selectedIndex === -1) {
this.selectedIndex = 0;
} else {
this.selectedIndex = Math.min(this.flatItems.length - 1, this.selectedIndex);
}
}
}
}
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