android/src/com/android/tools/idea/editors/navigation/SelectionModel.java

/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * 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.
 */
package com.android.tools.idea.editors.navigation;

import org.jetbrains.annotations.NotNull;

public class SelectionModel {
  public static final Event SELECTION_UPDATED = Event.update(SelectionModel.class);

  @NotNull private Selections.Selection mySelection = Selections.NULL;
  public final EventDispatcher<Event> listeners = new EventDispatcher<Event>();

  @NotNull
  public Selections.Selection getSelection() {
    return mySelection;
  }

  public void setSelection(@NotNull Selections.Selection selection) {
    if (mySelection == selection) {
      return;
    }
    mySelection.onRemove();

    selection.onSetup();
    mySelection = selection;
    listeners.notify(SELECTION_UPDATED);
  }
}