| /* |
| * Copyright (C) 2015 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.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.content.Context; |
| import android.view.MenuItem; |
| import android.view.View; |
| import android.view.View.MeasureSpec; |
| import android.view.ViewGroup; |
| import android.widget.AdapterView; |
| import android.widget.FrameLayout; |
| import android.widget.HeaderViewListAdapter; |
| import android.widget.ListAdapter; |
| import android.widget.PopupWindow; |
| |
| /** |
| * Base class for a menu popup abstraction - i.e., some type of menu, housed in a popup window |
| * environment. |
| * |
| * @hide |
| */ |
| public abstract class MenuPopup implements ShowableListMenu, MenuPresenter, |
| AdapterView.OnItemClickListener { |
| |
| public abstract void setForceShowIcon(boolean forceShow); |
| |
| /** |
| * Adds the given menu to the popup, if it is capable of displaying submenus within itself. |
| * If menu is the first menu shown, it won't be displayed until show() is called. |
| * If the popup was already showing, adding a submenu via this method will cause that new |
| * submenu to be shown immediately (that is, if this MenuPopup implementation is capable of |
| * showing its own submenus). |
| * |
| * @param menu |
| */ |
| public abstract void addMenu(MenuBuilder menu); |
| |
| public abstract void setGravity(int dropDownGravity); |
| |
| public abstract void setAnchorView(View anchor); |
| |
| public abstract void setHorizontalOffset(int x); |
| |
| public abstract void setVerticalOffset(int y); |
| |
| /** |
| * Set whether a title entry should be shown in the popup menu (if a title exists for the |
| * menu). |
| * |
| * @param showTitle |
| */ |
| public abstract void setShowTitle(boolean showTitle); |
| |
| /** |
| * Set a listener to receive a callback when the popup is dismissed. |
| * |
| * @param listener Listener that will be notified when the popup is dismissed. |
| */ |
| public abstract void setOnDismissListener(PopupWindow.OnDismissListener listener); |
| |
| @Override |
| public void initForMenu(@NonNull Context context, @Nullable MenuBuilder menu) { |
| // Don't need to do anything; we added as a presenter in the constructor. |
| } |
| |
| @Override |
| public MenuView getMenuView(ViewGroup root) { |
| throw new UnsupportedOperationException("MenuPopups manage their own views"); |
| } |
| |
| @Override |
| public boolean expandItemActionView(MenuBuilder menu, MenuItemImpl item) { |
| return false; |
| } |
| |
| @Override |
| public boolean collapseItemActionView(MenuBuilder menu, MenuItemImpl item) { |
| return false; |
| } |
| |
| @Override |
| public int getId() { |
| return 0; |
| } |
| |
| @Override |
| public void onItemClick(AdapterView<?> parent, View view, int position, long id) { |
| ListAdapter outerAdapter = (ListAdapter) parent.getAdapter(); |
| MenuAdapter wrappedAdapter = toMenuAdapter(outerAdapter); |
| |
| // Use the position from the outer adapter so that if a header view was added, we don't get |
| // an off-by-1 error in position. |
| wrappedAdapter.mAdapterMenu.performItemAction((MenuItem) outerAdapter.getItem(position), 0); |
| } |
| |
| /** |
| * Measures the width of the given menu view. |
| * |
| * @param view The view to measure. |
| * @return The width. |
| */ |
| protected static int measureIndividualMenuWidth(ListAdapter adapter, ViewGroup parent, |
| Context context, int maxAllowedWidth) { |
| // Menus don't tend to be long, so this is more sane than it looks. |
| int maxWidth = 0; |
| View itemView = null; |
| int itemType = 0; |
| |
| final int widthMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); |
| final int heightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); |
| final int count = adapter.getCount(); |
| for (int i = 0; i < count; i++) { |
| final int positionType = adapter.getItemViewType(i); |
| if (positionType != itemType) { |
| itemType = positionType; |
| itemView = null; |
| } |
| |
| if (parent == null) { |
| parent = new FrameLayout(context); |
| } |
| |
| itemView = adapter.getView(i, itemView, parent); |
| itemView.measure(widthMeasureSpec, heightMeasureSpec); |
| |
| final int itemWidth = itemView.getMeasuredWidth(); |
| if (itemWidth >= maxAllowedWidth) { |
| return maxAllowedWidth; |
| } else if (itemWidth > maxWidth) { |
| maxWidth = itemWidth; |
| } |
| } |
| |
| return maxWidth; |
| } |
| |
| /** |
| * Converts the given ListAdapter originating from a menu, to a MenuAdapter, accounting for |
| * the possibility of the parameter adapter actually wrapping the MenuAdapter. (That could |
| * happen if a header view was added on the menu.) |
| * |
| * @param adapter |
| * @return |
| */ |
| protected static MenuAdapter toMenuAdapter(ListAdapter adapter) { |
| if (adapter instanceof HeaderViewListAdapter) { |
| return (MenuAdapter) ((HeaderViewListAdapter) adapter).getWrappedAdapter(); |
| } |
| return (MenuAdapter) adapter; |
| } |
| } |