--- /dev/null
+/*
+ * 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.actionbarsherlock.internal.view.menu;
+
+import java.util.ArrayList;
+import android.content.Context;
+import android.os.Build;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+/**
+ * Base class for MenuPresenters that have a consistent container view and item
+ * views. Behaves similarly to an AdapterView in that existing item views will
+ * be reused if possible when items change.
+ */
+public abstract class BaseMenuPresenter implements MenuPresenter {
+ private static final boolean IS_HONEYCOMB = Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB;
+
+ protected Context mSystemContext;
+ protected Context mContext;
+ protected MenuBuilder mMenu;
+ protected LayoutInflater mSystemInflater;
+ protected LayoutInflater mInflater;
+ private Callback mCallback;
+
+ private int mMenuLayoutRes;
+ private int mItemLayoutRes;
+
+ protected MenuView mMenuView;
+
+ private int mId;
+
+ /**
+ * Construct a new BaseMenuPresenter.
+ *
+ * @param context Context for generating system-supplied views
+ * @param menuLayoutRes Layout resource ID for the menu container view
+ * @param itemLayoutRes Layout resource ID for a single item view
+ */
+ public BaseMenuPresenter(Context context, int menuLayoutRes, int itemLayoutRes) {
+ mSystemContext = context;
+ mSystemInflater = LayoutInflater.from(context);
+ mMenuLayoutRes = menuLayoutRes;
+ mItemLayoutRes = itemLayoutRes;
+ }
+
+ @Override
+ public void initForMenu(Context context, MenuBuilder menu) {
+ mContext = context;
+ mInflater = LayoutInflater.from(mContext);
+ mMenu = menu;
+ }
+
+ @Override
+ public MenuView getMenuView(ViewGroup root) {
+ if (mMenuView == null) {
+ mMenuView = (MenuView) mSystemInflater.inflate(mMenuLayoutRes, root, false);
+ mMenuView.initialize(mMenu);
+ updateMenuView(true);
+ }
+
+ return mMenuView;
+ }
+
+ /**
+ * Reuses item views when it can
+ */
+ public void updateMenuView(boolean cleared) {
+ final ViewGroup parent = (ViewGroup) mMenuView;
+ if (parent == null) return;
+
+ int childIndex = 0;
+ if (mMenu != null) {
+ mMenu.flagActionItems();
+ ArrayList<MenuItemImpl> visibleItems = mMenu.getVisibleItems();
+ final int itemCount = visibleItems.size();
+ for (int i = 0; i < itemCount; i++) {
+ MenuItemImpl item = visibleItems.get(i);
+ if (shouldIncludeItem(childIndex, item)) {
+ final View convertView = parent.getChildAt(childIndex);
+ final MenuItemImpl oldItem = convertView instanceof MenuView.ItemView ?
+ ((MenuView.ItemView) convertView).getItemData() : null;
+ final View itemView = getItemView(item, convertView, parent);
+ if (item != oldItem) {
+ // Don't let old states linger with new data.
+ itemView.setPressed(false);
+ if (IS_HONEYCOMB) itemView.jumpDrawablesToCurrentState();
+ }
+ if (itemView != convertView) {
+ addItemView(itemView, childIndex);
+ }
+ childIndex++;
+ }
+ }
+ }
+
+ // Remove leftover views.
+ while (childIndex < parent.getChildCount()) {
+ if (!filterLeftoverView(parent, childIndex)) {
+ childIndex++;
+ }
+ }
+ }
+
+ /**
+ * Add an item view at the given index.
+ *
+ * @param itemView View to add
+ * @param childIndex Index within the parent to insert at
+ */
+ protected void addItemView(View itemView, int childIndex) {
+ final ViewGroup currentParent = (ViewGroup) itemView.getParent();
+ if (currentParent != null) {
+ currentParent.removeView(itemView);
+ }
+ ((ViewGroup) mMenuView).addView(itemView, childIndex);
+ }
+
+ /**
+ * Filter the child view at index and remove it if appropriate.
+ * @param parent Parent to filter from
+ * @param childIndex Index to filter
+ * @return true if the child view at index was removed
+ */
+ protected boolean filterLeftoverView(ViewGroup parent, int childIndex) {
+ parent.removeViewAt(childIndex);
+ return true;
+ }
+
+ public void setCallback(Callback cb) {
+ mCallback = cb;
+ }
+
+ /**
+ * Create a new item view that can be re-bound to other item data later.
+ *
+ * @return The new item view
+ */
+ public MenuView.ItemView createItemView(ViewGroup parent) {
+ return (MenuView.ItemView) mSystemInflater.inflate(mItemLayoutRes, parent, false);
+ }
+
+ /**
+ * Prepare an item view for use. See AdapterView for the basic idea at work here.
+ * This may require creating a new item view, but well-behaved implementations will
+ * re-use the view passed as convertView if present. The returned view will be populated
+ * with data from the item parameter.
+ *
+ * @param item Item to present
+ * @param convertView Existing view to reuse
+ * @param parent Intended parent view - use for inflation.
+ * @return View that presents the requested menu item
+ */
+ public View getItemView(MenuItemImpl item, View convertView, ViewGroup parent) {
+ MenuView.ItemView itemView;
+ if (convertView instanceof MenuView.ItemView) {
+ itemView = (MenuView.ItemView) convertView;
+ } else {
+ itemView = createItemView(parent);
+ }
+ bindItemView(item, itemView);
+ return (View) itemView;
+ }
+
+ /**
+ * Bind item data to an existing item view.
+ *
+ * @param item Item to bind
+ * @param itemView View to populate with item data
+ */
+ public abstract void bindItemView(MenuItemImpl item, MenuView.ItemView itemView);
+
+ /**
+ * Filter item by child index and item data.
+ *
+ * @param childIndex Indended presentation index of this item
+ * @param item Item to present
+ * @return true if this item should be included in this menu presentation; false otherwise
+ */
+ public boolean shouldIncludeItem(int childIndex, MenuItemImpl item) {
+ return true;
+ }
+
+ public void onCloseMenu(MenuBuilder menu, boolean allMenusAreClosing) {
+ if (mCallback != null) {
+ mCallback.onCloseMenu(menu, allMenusAreClosing);
+ }
+ }
+
+ public boolean onSubMenuSelected(SubMenuBuilder menu) {
+ if (mCallback != null) {
+ return mCallback.onOpenSubMenu(menu);
+ }
+ return false;
+ }
+
+ public boolean flagActionItems() {
+ return false;
+ }
+
+ public boolean expandItemActionView(MenuBuilder menu, MenuItemImpl item) {
+ return false;
+ }
+
+ public boolean collapseItemActionView(MenuBuilder menu, MenuItemImpl item) {
+ return false;
+ }
+
+ public int getId() {
+ return mId;
+ }
+
+ public void setId(int id) {
+ mId = id;
+ }
+}
projects / debian / openrocket / blobdiff