TypeScript Map.get方法代码示例

	handleEvent(evt: IEvent) {
		let events = this._events.get(evt.type);

		if (!events) {
			return;
		}

		if (Array.isArray(events)) {
			let eventCount = events.length;

			if (eventCount == 1) {
				if (this._tryEventListener(events[0], evt) === false) {
					evt.propagationStopped = true;
				}
			} else {
				events = events.slice();

				for (let i = 0; i < eventCount; i++) {
					if (this._tryEventListener(events[i], evt) === false) {
						evt.propagationStopped = true;
					}
				}
			}
		} else if (this._tryEventListener(events, evt) === false) {
			evt.propagationStopped = true;
		}
	}

	_on(type: string, listener: TListener, context: any) {
		let index = type.indexOf(':');

		if (index != -1) {
			let propName = type.slice(index + 1);

			currentlySubscribing = true;
			(this[propName + 'Cell'] || (this[propName], this[propName + 'Cell'])).on(
				type.slice(0, index),
				listener,
				context
			);
			currentlySubscribing = false;
		} else {
			let events = this._events.get(type);
			let evt = { listener, context };

			if (!events) {
				this._events.set(type, evt);
			} else if (Array.isArray(events)) {
				events.push(evt);
			} else {
				this._events.set(type, [events, evt]);
			}
		}
	}

	getAll<T extends EventEmitter = EventEmitter>(typeName: string): Array<T> {
		let types = [] as Array<T>;

		((this._types.get(typeName) || []) as Array<T>).forEach(type => {
			types.push(type);
		});

		return types;
	}

	set(typeName: string, type: EventEmitter): this {
		let types = this._types.get(typeName);

		if (!types) {
			types = new Map<any, EventEmitter>();
			this._types.set(typeName, types);
		}

		types.set((type as any).id, type);

		return this;
	}

	discard(typeName: string, id?: any): boolean {
		let types = this._types.get(typeName);

		if (types && types.size) {
			if (arguments.length == 1) {
				types.clear();
				return true;
			}

			return types.delete(id);
		}

		return false;
	}

	emit(
		evt:
			| {
					target?: EventEmitter;
					type: string;
					bubbles?: boolean;
					defaultPrevented?: boolean;
					propagationStopped?: boolean;
					data?: {
						[name: string]: any;
					};
			  }
			| string,
		data?: { [name: string]: any }
	): IEvent {
		if (typeof evt == 'string') {
			evt = {
				target: this,
				type: evt
			};
		} else if (!evt.target) {
			evt.target = this;
		} else if (evt.target != this) {
			throw new TypeError('Event cannot be emitted on this object');
		}

		if (data) {
			evt.data = data;
		}

		if (transactionLevel) {
			let events = transactionEvents.get(this);

			if (!events) {
				events = Object.create(null) as { [type: string]: IEvent };
				transactionEvents.set(this, events);
			}

			(evt.data || (evt.data = {})).prev = events[evt.type] || null;
			events[evt.type] = evt as IEvent;
		} else {
			this.handleEvent(evt as IEvent);
		}

		return evt as IEvent;
	}

	_off(type: string, listener: TListener, context: any) {
		let index = type.indexOf(':');

		if (index != -1) {
			let propName = type.slice(index + 1);

			(this[propName + 'Cell'] || (this[propName], this[propName + 'Cell'])).off(
				type.slice(0, index),
				listener,
				context
			);
		} else {
			let events = this._events.get(type);

			if (!events) {
				return;
			}

			let evt;

			if (!Array.isArray(events)) {
				evt = events;
			} else if (events.length == 1) {
				evt = events[0];
			} else {
				for (let i = events.length; i; ) {
					evt = events[--i];

					if (evt.listener == listener && evt.context === context) {
						events.splice(i, 1);
						break;
					}
				}

				return;
			}

			if (evt.listener == listener && evt.context === context) {
				this._events.delete(type);
			}
		}
	}

	getEvents(type?: string) {
		let events: any;

		if (type) {
			events = this._events.get(type);

			if (!events) {
				return [];
			}

			return Array.isArray(events) ? events : [events];
		}

		events = Object.create(null);

		this._events.forEach((typeEvents, type) => {
			events[type] = Array.isArray(typeEvents) ? typeEvents : [typeEvents];
		});

		return events;
	}

	push<T = any>(data: any): T {
		if (Array.isArray(data)) {
			let list = [] as Array<any>;

			for (let i = 0, l = data.length; i < l; i++) {
				let value = data[i];
				list[i] = isObjectOrArray(value) ? this.push(value) : value;
			}

			return list as any;
		}

		let typeName = data.__type;

		if (typeName) {
			let typeConstructor = this._typeConstructors.get(typeName);

			if (!typeConstructor) {
				throw new TypeError(`Type "${typeName}" is not defined`);
			}

			let types = this._types.get(typeName);

			if (!types) {
				types = new Map<any, EventEmitter>();
				this._types.set(typeName, types);
			}

			let id = data.id;
			let type = types.get(id);

			if (!type) {
				type = new typeConstructor();
				types.set(id, type);
			}

			for (let name in data) {
				if (name != '__type') {
					let value = data[name];

					if (value && typeof value == 'object') {
						if (Object.getPrototypeOf(value) === ObjectProto) {
							value = this.push(value);

							if (Object.getPrototypeOf(value) === ObjectProto) {
								value = new ObservableMap(value);
							}
						} else if (Array.isArray(value)) {
							value = new ObservableList(this.push(value) as Array<any>);
						}
					}

					(type as any)[name] = value;
				}
			}

			return type as any;
		}

		let dataCopy = {} as { [name: string]: any };

		for (let name in data) {
			let value = data[name];
			dataCopy[name] = isObjectOrArray(value) ? this.push(value) : value;
		}

		return dataCopy as any;
	}

	get(typeName: string, id?: any | Array<any>): EventEmitter | Array<EventEmitter | null> | null {
		let types = this._types.get(typeName);
		return Array.isArray(id)
			? id.map(id => (types && types.get(id)) || null)
			: (types && types.get(id)) || null;
	}