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/*
* 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 com.android.internal.view.menu;
import android.content.Context;
import android.view.Menu;
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.
*/
public interface MenuPresenter {
/**
* Called by menu implementation to notify another component of open/close events.
*/
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, Menu)}.
*
* @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);
}
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