Open-ILS/src/eg2/src/app/share/context-menu/context-menu.directive.ts

   1 import {Input, Output, EventEmitter, Directive} from '@angular/core';
   2 import {NgbPopover} from '@ng-bootstrap/ng-bootstrap';
   3 import {ContextMenuService, ContextMenu, ContextMenuEntry} from './context-menu.service';
   4
   5
   6 /* Import all of this stuff so we can pass it to our parent
   7  * class via its constructor */
   8 import {
   9     Inject, Injector, Renderer2, ElementRef, TemplateRef, ViewContainerRef,
  10     ComponentFactoryResolver, NgZone, ChangeDetectorRef, ApplicationRef
  11 } from '@angular/core';
  12 import {DOCUMENT} from '@angular/common';
  13 import {NgbPopoverConfig} from '@ng-bootstrap/ng-bootstrap';
  14 /* --- */
  15
  16 @Directive({
  17   selector: '[egContextMenu]',
  18   exportAs: 'egContextMenu'
  19 })
  20 export class ContextMenuDirective extends NgbPopover {
  21
  22     // Only one active menu is allowed at a time.
  23     static activeDirective: ContextMenuDirective;
  24     static menuId = 0;
  25
  26     triggers = 'contextmenu';
  27     popoverClass = 'eg-context-menu';
  28
  29     menuEntries: ContextMenuEntry[] = [];
  30     menu: ContextMenu;
  31
  32     @Input() set egContextMenu(menuEntries: ContextMenuEntry[]) {
  33         this.menuEntries = menuEntries;
  34     }
  35
  36     @Output() menuItemSelected: EventEmitter<ContextMenuEntry>;
  37
  38     constructor(
  39         p1: ElementRef<HTMLElement>, p2: Renderer2, p3: Injector,
  40         p4: ComponentFactoryResolver, p5: ViewContainerRef, p6: NgbPopoverConfig,
  41         p7: NgZone, @Inject(DOCUMENT) p8: any, p9: ChangeDetectorRef,
  42         p10: ApplicationRef, private menuService: ContextMenuService) {
  43
  44         // relay injected services to parent
  45         super(p1, p2, p3, p4, p5, p6, p7, p8, p9, p10);
  46
  47         this.menuItemSelected = new EventEmitter<ContextMenuEntry>();
  48
  49         this.menuService.menuItemSelected.subscribe(
  50             (entry: ContextMenuEntry) => {
  51
  52             // Only broadcast entry selection to my listeners if I'm
  53             // hosting the menu where the selection occurred.
  54
  55             if (this.activeMenuIsMe()) {
  56                 this.menuItemSelected.emit(entry);
  57
  58                 // Item selection via keyboard fails to close the menu.
  59                 // Force it closed.
  60                 this.cleanup();
  61             }
  62         });
  63     }
  64
  65     activeMenuIsMe(): boolean {
  66         return (
  67             this.menu &&
  68             this.menuService.activeMenu &&
  69             this.menu.id === this.menuService.activeMenu.id
  70         );
  71     }
  72
  73     // Close the active menu
  74     cleanup() {
  75         if (ContextMenuDirective.activeDirective) {
  76             ContextMenuDirective.activeDirective.close();
  77             ContextMenuDirective.activeDirective = null;
  78             this.menuService.activeMenu = null;
  79         }
  80     }
  81
  82     open() {
  83
  84         // In certain scenarios (e.g. right-clicking on another context
  85         // menu) an open popover will stay open.  Force it closed here.
  86         this.cleanup();
  87
  88         if (!this.menuEntries ||
  89              this.menuEntries.length === 0) {
  90              return;
  91         }
  92
  93         this.menu = new ContextMenu();
  94         this.menu.id = ContextMenuDirective.menuId++;
  95         this.menu.entries = this.menuEntries;
  96
  97         this.menuService.activeMenu = this.menu;
  98         this.menuService.showMenuRequest.emit(this.menu);
  99         this.ngbPopover = this.menuService.menuTemplate;
 100
 101         ContextMenuDirective.activeDirective = this;
 102
 103         super.open();
 104     }
 105 }
 106
 107