/*
* Copyright (C) 2010 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.content.res.Resources;
import android.os.Parcelable;
import android.support.v7.appcompat.R;
import android.support.v7.widget.ListPopupWindow;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.MeasureSpec;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.FrameLayout;
import android.widget.ListAdapter;
import android.widget.PopupWindow;
import java.util.ArrayList;
/**
* Presents a menu as a small, simple popup anchored to another view.
*
* @hide
*/
public class MenuPopupHelper implements AdapterView.OnItemClickListener, View.OnKeyListener,
ViewTreeObserver.OnGlobalLayoutListener, PopupWindow.OnDismissListener,
MenuPresenter {
private static final String TAG = "MenuPopupHelper";
static final int ITEM_LAYOUT = R.layout.abc_popup_menu_item_layout;
private final Context mContext;
private final LayoutInflater mInflater;
private final MenuBuilder mMenu;
private final MenuAdapter mAdapter;
private final boolean mOverflowOnly;
private final int mPopupMaxWidth;
private final int mPopupStyleAttr;
private final int mPopupStyleRes;
private View mAnchorView;
private ListPopupWindow mPopup;
private ViewTreeObserver mTreeObserver;
private Callback mPresenterCallback;
boolean mForceShowIcon;
private ViewGroup mMeasureParent;
/** Whether the cached content width value is valid. */
private boolean mHasContentWidth;
/** Cached content width from {@link #measureContentWidth}. */
private int mContentWidth;
private int mDropDownGravity = Gravity.NO_GRAVITY;
public MenuPopupHelper(Context context, MenuBuilder menu) {
this(context, menu, null, false, R.attr.popupMenuStyle);
}
public MenuPopupHelper(Context context, MenuBuilder menu, View anchorView) {
this(context, menu, anchorView, false, R.attr.popupMenuStyle);
}
public MenuPopupHelper(Context context, MenuBuilder menu, View anchorView,
boolean overflowOnly, int popupStyleAttr) {
this(context, menu, anchorView, overflowOnly, popupStyleAttr, 0);
}
public MenuPopupHelper(Context context, MenuBuilder menu, View anchorView,
boolean overflowOnly, int popupStyleAttr, int popupStyleRes) {
mContext = context;
mInflater = LayoutInflater.from(context);
mMenu = menu;
mAdapter = new MenuAdapter(mMenu);
mOverflowOnly = overflowOnly;
mPopupStyleAttr = popupStyleAttr;
mPopupStyleRes = popupStyleRes;
final Resources res = context.getResources();
mPopupMaxWidth = Math.max(res.getDisplayMetrics().widthPixels / 2,
res.getDimensionPixelSize(R.dimen.abc_config_prefDialogWidth));
mAnchorView = anchorView;
// Present the menu using our context, not the menu builder's context.
menu.addMenuPresenter(this, context);
}
public void setAnchorView(View anchor) {
mAnchorView = anchor;
}
public void setForceShowIcon(boolean forceShow) {
mForceShowIcon = forceShow;
}
public void setGravity(int gravity) {
mDropDownGravity = gravity;
}
public void show() {
if (!tryShow()) {
throw new IllegalStateException("MenuPopupHelper cannot be used without an anchor");
}
}
public ListPopupWindow getPopup() {
return mPopup;
}
public boolean tryShow() {
mPopup = new ListPopupWindow(mContext, null, mPopupStyleAttr, mPopupStyleRes);
mPopup.setOnDismissListener(this);
mPopup.setOnItemClickListener(this);
mPopup.setAdapter(mAdapter);
mPopup.setModal(true);
View anchor = mAnchorView;
if (anchor != null) {
final boolean addGlobalListener = mTreeObserver == null;
mTreeObserver = anchor.getViewTreeObserver(); // Refresh to latest
if (addGlobalListener) mTreeObserver.addOnGlobalLayoutListener(this);
mPopup.setAnchorView(anchor);
mPopup.setDropDownGravity(mDropDownGravity);
} else {
return false;
}
if (!mHasContentWidth) {
mContentWidth = measureContentWidth();
mHasContentWidth = true;
}
mPopup.setContentWidth(mContentWidth);
mPopup.setInputMethodMode(PopupWindow.INPUT_METHOD_NOT_NEEDED);
mPopup.show();
mPopup.getListView().setOnKeyListener(this);
return true;
}
public void dismiss() {
if (isShowing()) {
mPopup.dismiss();
}
}
public void onDismiss() {
mPopup = null;
mMenu.close();
if (mTreeObserver != null) {
if (!mTreeObserver.isAlive()) mTreeObserver = mAnchorView.getViewTreeObserver();
mTreeObserver.removeGlobalOnLayoutListener(this);
mTreeObserver = null;
}
}
public boolean isShowing() {
return mPopup != null && mPopup.isShowing();
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
MenuAdapter adapter = mAdapter;
adapter.mAdapterMenu.performItemAction(adapter.getItem(position), 0);
}
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_UP && keyCode == KeyEvent.KEYCODE_MENU) {
dismiss();
return true;
}
return false;
}
private int measureContentWidth() {
// 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 ListAdapter adapter = mAdapter;
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 (mMeasureParent == null) {
mMeasureParent = new FrameLayout(mContext);
}
itemView = adapter.getView(i, itemView, mMeasureParent);
itemView.measure(widthMeasureSpec, heightMeasureSpec);
final int itemWidth = itemView.getMeasuredWidth();
if (itemWidth >= mPopupMaxWidth) {
return mPopupMaxWidth;
} else if (itemWidth > maxWidth) {
maxWidth = itemWidth;
}
}
return maxWidth;
}
@Override
public void onGlobalLayout() {
if (isShowing()) {
final View anchor = mAnchorView;
if (anchor == null || !anchor.isShown()) {
dismiss();
} else if (isShowing()) {
// Recompute window size and position
mPopup.show();
}
}
}
@Override
public void initForMenu(Context context, 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("MenuPopupHelpers manage their own views");
}
@Override
public void updateMenuView(boolean cleared) {
mHasContentWidth = false;
if (mAdapter != null) {
mAdapter.notifyDataSetChanged();
}
}
@Override
public void setCallback(Callback cb) {
mPresenterCallback = cb;
}
@Override
public boolean onSubMenuSelected(SubMenuBuilder subMenu) {
if (subMenu.hasVisibleItems()) {
MenuPopupHelper subPopup = new MenuPopupHelper(mContext, subMenu, mAnchorView);
subPopup.setCallback(mPresenterCallback);
boolean preserveIconSpacing = false;
final int count = subMenu.size();
for (int i = 0; i < count; i++) {
MenuItem childItem = subMenu.getItem(i);
if (childItem.isVisible() && childItem.getIcon() != null) {
preserveIconSpacing = true;
break;
}
}
subPopup.setForceShowIcon(preserveIconSpacing);
if (subPopup.tryShow()) {
if (mPresenterCallback != null) {
mPresenterCallback.onOpenSubMenu(subMenu);
}
return true;
}
}
return false;
}
@Override
public void onCloseMenu(MenuBuilder menu, boolean allMenusAreClosing) {
// Only care about the (sub)menu we're presenting.
if (menu != mMenu) return;
dismiss();
if (mPresenterCallback != null) {
mPresenterCallback.onCloseMenu(menu, allMenusAreClosing);
}
}
@Override
public boolean flagActionItems() {
return false;
}
public boolean expandItemActionView(MenuBuilder menu, MenuItemImpl item) {
return false;
}
public boolean collapseItemActionView(MenuBuilder menu, MenuItemImpl item) {
return false;
}
@Override
public int getId() {
return 0;
}
@Override
public Parcelable onSaveInstanceState() {
return null;
}
@Override
public void onRestoreInstanceState(Parcelable state) {
}
private class MenuAdapter extends BaseAdapter {
private MenuBuilder mAdapterMenu;
private int mExpandedIndex = -1;
public MenuAdapter(MenuBuilder menu) {
mAdapterMenu = menu;
findExpandedIndex();
}
public int getCount() {
ArrayList<MenuItemImpl> items = mOverflowOnly ?
mAdapterMenu.getNonActionItems() : mAdapterMenu.getVisibleItems();
if (mExpandedIndex < 0) {
return items.size();
}
return items.size() - 1;
}
public MenuItemImpl getItem(int position) {
ArrayList<MenuItemImpl> items = mOverflowOnly ?
mAdapterMenu.getNonActionItems() : mAdapterMenu.getVisibleItems();
if (mExpandedIndex >= 0 && position >= mExpandedIndex) {
position++;
}
return items.get(position);
}
public long getItemId(int position) {
// Since a menu item's ID is optional, we'll use the position as an
// ID for the item in the AdapterView
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = mInflater.inflate(ITEM_LAYOUT, parent, false);
}
MenuView.ItemView itemView = (MenuView.ItemView) convertView;
if (mForceShowIcon) {
((ListMenuItemView) convertView).setForceShowIcon(true);
}
itemView.initialize(getItem(position), 0);
return convertView;
}
void findExpandedIndex() {
final MenuItemImpl expandedItem = mMenu.getExpandedItem();
if (expandedItem != null) {
final ArrayList<MenuItemImpl> items = mMenu.getNonActionItems();
final int count = items.size();
for (int i = 0; i < count; i++) {
final MenuItemImpl item = items.get(i);
if (item == expandedItem) {
mExpandedIndex = i;
return;
}
}
}
mExpandedIndex = -1;
}
@Override
public void notifyDataSetChanged() {
findExpandedIndex();
super.notifyDataSetChanged();
}
}
}
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