Kaiu - Material contextual menu

This package provide an @angular/material compatible contextual menu. It is heavily based on the already existing MatMenu and use a new service inspired by the Material DialogService.

Getting started

Install the NPM package

npm install --save @kaiu/material-contextual-menu

Declare a KaiuMenuContainer

import { KaiuMenuContainer } from '@kaiu/material-contextual-menu';

@Component({
  template: `
      <mat-menu #mainMenu="matMenu">
          <button mat-menu-item (click)="select.emit('foo')">Foo</button>
          <button mat-menu-item (click)="select.emit('bar')">Bar</button>
          <button mat-menu-item [matMenuTriggerFor]="subMenu">Others</button>
      </mat-menu>

      <mat-menu #subMenu="matMenu">
          <button mat-menu-item (click)="select.emit({prop: 1})">First</button>
          <button mat-menu-item (click)="select.emit({prop: 2})">Second</button>
          <button mat-menu-item (click)="select.emit({prop: 3})">Third</button>
      </mat-menu>
  `,
})
export class ContextualMenuComponent implements KaiuMenuContainer {

  // To be a KaiuMenuContainer a component must...

  // ...give access to an inner MatMenu directive
  @ViewChild('mainMenu') matMenu: MatMenu;

  // ...and use an observable to communicate with the menu opener.
  select = new EventEmitter<string>();
}

Import the module

import { KaiuMenuModule } from '@kaiu/material-contextual-menu';

@NgModule({
  declarations: [ AppComponent ],
  imports: [
    BrowserAnimationsModule, // Or NoopAnimationsModule
    KaiuMenuModule, // The MatMenuModule is shipped with.
  ],
  bootstrap: [ AppComponent ],
})
export class AppModule {}

Open the menu

import { KaiuMenuService } from '@kaiu/material-contextual-menu';

@Component({
  selector: 'app-demo',
  template: `<h1>Hello world</h1>`,
})
export class DemoComponent {

  constructor(private menuService: KaiuMenuService, private viewContainerRef: ViewContainerRef) {}

  @HostListener('contextmenu', ['$event']) onContextMenu(event: MouseEvent) {
    // Prevent the browser native contextual menu.
    event.preventDefault();

    // Open a new ContextualMenuComponent at the cursor position.
    const menuRef = this.menuService.openMenu(
        ContextualMenuComponent,
        { x: event.clientX, y: event.clientY },
        this.viewContainerRef
    );

    // Listen for selected item in the menu.
    menuRef.afterClosed().subscribe((value) => {
      console.log('Menu closed with value: ', value);
    });
  }

  @HostListener('click') onClick() {
    // Close already opened menus when clicking outside a menu.
    this.menuService.closeAll();
  }
}

Development

A demo application is provided, based on Angular CLI.

Run npm start and then go to http://localhost:4200.

License

Everything in this repository is licensed under the MIT License unless otherwise specified.

Copyright (c) 2020 - Kaiu Lab