All files / core/view Change.ts

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/**
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
import { Node } from '../snap/Node';
 
/**
 * @constructor
 * @struct
 * @param {!string} type The event type
 * @param {!Node} snapshotNode The data
 * @param {string=} childName The name for this child, if it's a child event
 * @param {Node=} oldSnap Used for intermediate processing of child changed events
 * @param {string=} prevName The name for the previous child, if applicable
 */
export class Change {
  constructor(
    public type: string,
    public snapshotNode: Node,
    public childName?: string,
    public oldSnap?: Node,
    public prevName?: string
  ) {}
 
  /**
   * @param {!Node} snapshot
   * @return {!Change}
   */
  static valueChange(snapshot: Node): Change {
    return new Change(Change.VALUE, snapshot);
  }
 
  /**
   * @param {string} childKey
   * @param {!Node} snapshot
   * @return {!Change}
   */
  static childAddedChange(childKey: string, snapshot: Node): Change {
    return new Change(Change.CHILD_ADDED, snapshot, childKey);
  }
 
  /**
   * @param {string} childKey
   * @param {!Node} snapshot
   * @return {!Change}
   */
  static childRemovedChange(childKey: string, snapshot: Node): Change {
    return new Change(Change.CHILD_REMOVED, snapshot, childKey);
  }
 
  /**
   * @param {string} childKey
   * @param {!Node} newSnapshot
   * @param {!Node} oldSnapshot
   * @return {!Change}
   */
  static childChangedChange(
    childKey: string,
    newSnapshot: Node,
    oldSnapshot: Node
  ): Change {
    return new Change(Change.CHILD_CHANGED, newSnapshot, childKey, oldSnapshot);
  }
 
  /**
   * @param {string} childKey
   * @param {!Node} snapshot
   * @return {!Change}
   */
  static childMovedChange(childKey: string, snapshot: Node): Change {
    return new Change(Change.CHILD_MOVED, snapshot, childKey);
  }
 
  //event types
  /** Event type for a child added */
  static CHILD_ADDED = 'child_added';
 
  /** Event type for a child removed */
  static CHILD_REMOVED = 'child_removed';
 
  /** Event type for a child changed */
  static CHILD_CHANGED = 'child_changed';
 
  /** Event type for a child moved */
  static CHILD_MOVED = 'child_moved';
 
  /** Event type for a value change */
  static VALUE = 'value';
}