| /* |
| * 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 com.android.internal.view.menu; |
| |
| import com.android.internal.view.menu.MenuBuilder.MenuAdapter; |
| |
| import android.content.Context; |
| import android.os.Handler; |
| import android.util.DisplayMetrics; |
| import android.view.KeyEvent; |
| import android.view.MenuItem; |
| import android.view.View; |
| import android.view.View.MeasureSpec; |
| import android.view.ViewTreeObserver; |
| import android.widget.AdapterView; |
| import android.widget.ListPopupWindow; |
| import android.widget.PopupWindow; |
| |
| import java.lang.ref.WeakReference; |
| |
| /** |
| * @hide |
| */ |
| public class MenuPopupHelper implements AdapterView.OnItemClickListener, View.OnKeyListener, |
| ViewTreeObserver.OnGlobalLayoutListener, PopupWindow.OnDismissListener { |
| private static final String TAG = "MenuPopupHelper"; |
| |
| private Context mContext; |
| private ListPopupWindow mPopup; |
| private MenuBuilder mMenu; |
| private int mPopupMaxWidth; |
| private WeakReference<View> mAnchorView; |
| private boolean mOverflowOnly; |
| private ViewTreeObserver mTreeObserver; |
| |
| private final Handler mHandler = new Handler(); |
| |
| public MenuPopupHelper(Context context, MenuBuilder menu) { |
| this(context, menu, null, false); |
| } |
| |
| public MenuPopupHelper(Context context, MenuBuilder menu, View anchorView) { |
| this(context, menu, anchorView, false); |
| } |
| |
| public MenuPopupHelper(Context context, MenuBuilder menu, |
| View anchorView, boolean overflowOnly) { |
| mContext = context; |
| mMenu = menu; |
| mOverflowOnly = overflowOnly; |
| |
| final DisplayMetrics metrics = context.getResources().getDisplayMetrics(); |
| mPopupMaxWidth = metrics.widthPixels / 2; |
| |
| if (anchorView != null) { |
| mAnchorView = new WeakReference<View>(anchorView); |
| } |
| } |
| |
| public void setAnchorView(View anchor) { |
| mAnchorView = new WeakReference<View>(anchor); |
| } |
| |
| public void show() { |
| if (!tryShow()) { |
| throw new IllegalStateException("MenuPopupHelper cannot be used without an anchor"); |
| } |
| } |
| |
| public boolean tryShow() { |
| mPopup = new ListPopupWindow(mContext, null, com.android.internal.R.attr.popupMenuStyle); |
| mPopup.setOnItemClickListener(this); |
| mPopup.setOnDismissListener(this); |
| |
| final MenuAdapter adapter = mOverflowOnly ? |
| mMenu.getOverflowMenuAdapter(MenuBuilder.TYPE_POPUP) : |
| mMenu.getMenuAdapter(MenuBuilder.TYPE_POPUP); |
| mPopup.setAdapter(adapter); |
| mPopup.setModal(true); |
| |
| View anchor = mAnchorView != null ? mAnchorView.get() : null; |
| if (anchor == null && mMenu instanceof SubMenuBuilder) { |
| SubMenuBuilder subMenu = (SubMenuBuilder) mMenu; |
| final MenuItemImpl itemImpl = (MenuItemImpl) subMenu.getItem(); |
| anchor = itemImpl.getItemView(MenuBuilder.TYPE_ACTION_BUTTON, null); |
| mAnchorView = new WeakReference<View>(anchor); |
| } |
| |
| if (anchor != null) { |
| mTreeObserver = anchor.getViewTreeObserver(); |
| mTreeObserver.addOnGlobalLayoutListener(this); |
| mPopup.setAnchorView(anchor); |
| } else { |
| return false; |
| } |
| |
| mPopup.setContentWidth(Math.min(measureContentWidth(adapter), mPopupMaxWidth)); |
| 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; |
| if (mTreeObserver != null) { |
| mTreeObserver.removeGlobalOnLayoutListener(MenuPopupHelper.this); |
| mTreeObserver = null; |
| } |
| } |
| |
| public boolean isShowing() { |
| return mPopup != null && mPopup.isShowing(); |
| } |
| |
| public void onItemClick(AdapterView<?> parent, View view, int position, long id) { |
| MenuItem item = null; |
| if (mOverflowOnly) { |
| item = mMenu.getOverflowItem(position); |
| } else { |
| item = mMenu.getVisibleItems().get(position); |
| } |
| dismiss(); |
| |
| final MenuItem performItem = item; |
| mHandler.post(new Runnable() { |
| public void run() { |
| mMenu.performItemAction(performItem, 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(MenuAdapter adapter) { |
| // Menus don't tend to be long, so this is more sane than it looks. |
| int width = 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; |
| } |
| itemView = adapter.getView(i, itemView, null); |
| itemView.measure(widthMeasureSpec, heightMeasureSpec); |
| width = Math.max(width, itemView.getMeasuredWidth()); |
| } |
| return width; |
| } |
| |
| @Override |
| public void onGlobalLayout() { |
| if (!isShowing()) { |
| mTreeObserver.removeGlobalOnLayoutListener(this); |
| mTreeObserver = null; |
| } else { |
| final View anchor = mAnchorView != null ? mAnchorView.get() : null; |
| if (anchor != null && !anchor.isShown()) { |
| dismiss(); |
| } else { |
| // Recompute window size and position |
| mPopup.show(); |
| } |
| } |
| } |
| } |