| /* |
| * Copyright (C) 2011 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.v7.internal.view.menu; |
| |
| import android.content.Context; |
| import android.os.Parcelable; |
| import android.view.ViewGroup; |
| |
| /** |
| * A MenuPresenter is responsible for building views for a Menu object. It takes over some |
| * responsibility from the old style monolithic MenuBuilder class. |
| * |
| * @hide |
| */ |
| public interface MenuPresenter { |
| |
| /** |
| * Called by menu implementation to notify another component of open/close events. |
| * |
| * @hide |
| */ |
| public interface Callback { |
| /** |
| * Called when a menu is closing. |
| * @param menu |
| * @param allMenusAreClosing |
| */ |
| public void onCloseMenu(MenuBuilder menu, boolean allMenusAreClosing); |
| |
| /** |
| * Called when a submenu opens. Useful for notifying the application |
| * of menu state so that it does not attempt to hide the action bar |
| * while a submenu is open or similar. |
| * |
| * @param subMenu Submenu currently being opened |
| * @return true if the Callback will handle presenting the submenu, false if |
| * the presenter should attempt to do so. |
| */ |
| public boolean onOpenSubMenu(MenuBuilder subMenu); |
| } |
| |
| /** |
| * Initialize this presenter for the given context and menu. |
| * This method is called by MenuBuilder when a presenter is |
| * added. See {@link MenuBuilder#addMenuPresenter(MenuPresenter)} |
| * |
| * @param context Context for this presenter; used for view creation and resource management |
| * @param menu Menu to host |
| */ |
| public void initForMenu(Context context, MenuBuilder menu); |
| |
| /** |
| * Retrieve a MenuView to display the menu specified in |
| * {@link #initForMenu(Context, MenuBuilder)}. |
| * |
| * @param root Intended parent of the MenuView. |
| * @return A freshly created MenuView. |
| */ |
| public MenuView getMenuView(ViewGroup root); |
| |
| /** |
| * Update the menu UI in response to a change. Called by |
| * MenuBuilder during the normal course of operation. |
| * |
| * @param cleared true if the menu was entirely cleared |
| */ |
| public void updateMenuView(boolean cleared); |
| |
| /** |
| * Set a callback object that will be notified of menu events |
| * related to this specific presentation. |
| * @param cb Callback that will be notified of future events |
| */ |
| public void setCallback(Callback cb); |
| |
| /** |
| * Called by Menu implementations to indicate that a submenu item |
| * has been selected. An active Callback should be notified, and |
| * if applicable the presenter should present the submenu. |
| * |
| * @param subMenu SubMenu being opened |
| * @return true if the the event was handled, false otherwise. |
| */ |
| public boolean onSubMenuSelected(SubMenuBuilder subMenu); |
| |
| /** |
| * Called by Menu implementations to indicate that a menu or submenu is |
| * closing. Presenter implementations should close the representation |
| * of the menu indicated as necessary and notify a registered callback. |
| * |
| * @param menu Menu or submenu that is closing. |
| * @param allMenusAreClosing True if all associated menus are closing. |
| */ |
| public void onCloseMenu(MenuBuilder menu, boolean allMenusAreClosing); |
| |
| /** |
| * Called by Menu implementations to flag items that will be shown as actions. |
| * @return true if this presenter changed the action status of any items. |
| */ |
| public boolean flagActionItems(); |
| |
| /** |
| * Called when a menu item with a collapsable action view should expand its action view. |
| * |
| * @param menu Menu containing the item to be expanded |
| * @param item Item to be expanded |
| * @return true if this presenter expanded the action view, false otherwise. |
| */ |
| public boolean expandItemActionView(MenuBuilder menu, MenuItemImpl item); |
| |
| /** |
| * Called when a menu item with a collapsable action view should collapse its action view. |
| * |
| * @param menu Menu containing the item to be collapsed |
| * @param item Item to be collapsed |
| * @return true if this presenter collapsed the action view, false otherwise. |
| */ |
| public boolean collapseItemActionView(MenuBuilder menu, MenuItemImpl item); |
| |
| /** |
| * Returns an ID for determining how to save/restore instance state. |
| * @return a valid ID value. |
| */ |
| public int getId(); |
| |
| /** |
| * Returns a Parcelable describing the current state of the presenter. |
| * It will be passed to the {@link #onRestoreInstanceState(Parcelable)} |
| * method of the presenter sharing the same ID later. |
| * @return The saved instance state |
| */ |
| public Parcelable onSaveInstanceState(); |
| |
| /** |
| * Supplies the previously saved instance state to be restored. |
| * @param state The previously saved instance state |
| */ |
| public void onRestoreInstanceState(Parcelable state); |
| } |