| /* |
| * Copyright (C) 2017 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 android.support.wear.internal.widget.drawer; |
| |
| import android.support.annotation.MainThread; |
| import android.support.annotation.RestrictTo; |
| import android.support.annotation.RestrictTo.Scope; |
| import android.support.wear.widget.drawer.WearableNavigationDrawerView.OnItemSelectedListener; |
| import android.support.wear.widget.drawer.WearableNavigationDrawerView.WearableNavigationDrawerAdapter; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| /** |
| * Controls the behavior of this view where the behavior may differ between single and multi-page. |
| * |
| * @hide |
| */ |
| @RestrictTo(Scope.LIBRARY) |
| public abstract class WearableNavigationDrawerPresenter { |
| |
| private final Set<OnItemSelectedListener> mOnItemSelectedListeners = new HashSet<>(); |
| |
| /** |
| * Indicates to the presenter that the underlying data has changed. |
| */ |
| @MainThread |
| public abstract void onDataSetChanged(); |
| |
| /** |
| * Indicates to the presenter that the drawer has a new adapter. |
| */ |
| @MainThread |
| public abstract void onNewAdapter(WearableNavigationDrawerAdapter adapter); |
| |
| /** |
| * Indicates to the presenter that the user has selected an item. |
| */ |
| @MainThread |
| public abstract void onSelected(int index); |
| |
| /** |
| * Indicates to the presenter that the developer wishes to change which item is selected. |
| */ |
| @MainThread |
| public abstract void onSetCurrentItemRequested(int index, boolean smoothScrollTo); |
| |
| /** |
| * Indicates to the presenter that the user has tapped on the drawer. |
| * |
| * @return {@code true} if the touch event has been handled and should not propagate further. |
| */ |
| @MainThread |
| public abstract boolean onDrawerTapped(); |
| |
| /** |
| * Indicates to the presenter that a new {@link OnItemSelectedListener} has been added. |
| */ |
| @MainThread |
| public void onItemSelectedListenerAdded(OnItemSelectedListener listener) { |
| mOnItemSelectedListeners.add(listener); |
| } |
| |
| /** |
| * Indicates to the presenter that an {@link OnItemSelectedListener} has been removed. |
| */ |
| @MainThread |
| public void onItemSelectedListenerRemoved(OnItemSelectedListener listener) { |
| mOnItemSelectedListeners.remove(listener); |
| } |
| |
| /** |
| * Notifies all listeners that the item at {@code selectedPos} has been selected. |
| */ |
| @MainThread |
| void notifyItemSelectedListeners(int selectedPos) { |
| for (OnItemSelectedListener listener : mOnItemSelectedListeners) { |
| listener.onItemSelected(selectedPos); |
| } |
| } |
| } |