Adam Powell | 4267534 | 2010-07-09 18:02:59 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2010 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.internal.view.menu; |
| 18 | |
| 19 | import com.android.internal.view.menu.MenuBuilder.MenuAdapter; |
| 20 | |
| 21 | import android.content.Context; |
| 22 | import android.util.DisplayMetrics; |
| 23 | import android.view.View; |
| 24 | import android.view.View.MeasureSpec; |
| 25 | import android.widget.AdapterView; |
| 26 | import android.widget.ListPopupWindow; |
| 27 | |
| 28 | /** |
| 29 | * @hide |
| 30 | */ |
| 31 | public class MenuPopupHelper implements AdapterView.OnItemClickListener { |
| 32 | private static final String TAG = "MenuPopupHelper"; |
| 33 | |
| 34 | private Context mContext; |
| 35 | private ListPopupWindow mPopup; |
| 36 | private SubMenuBuilder mSubMenu; |
| 37 | private int mPopupMaxWidth; |
| 38 | |
| 39 | public MenuPopupHelper(Context context, SubMenuBuilder subMenu) { |
| 40 | mContext = context; |
| 41 | mSubMenu = subMenu; |
| 42 | |
| 43 | final DisplayMetrics metrics = context.getResources().getDisplayMetrics(); |
| 44 | mPopupMaxWidth = metrics.widthPixels / 2; |
| 45 | } |
| 46 | |
| 47 | public void show() { |
| 48 | // TODO Use a style from the theme here |
| 49 | mPopup = new ListPopupWindow(mContext, null, 0, |
| 50 | com.android.internal.R.style.Widget_Spinner); |
| 51 | mPopup.setOnItemClickListener(this); |
| 52 | |
| 53 | final MenuAdapter adapter = mSubMenu.getMenuAdapter(MenuBuilder.TYPE_POPUP); |
| 54 | mPopup.setAdapter(adapter); |
| 55 | mPopup.setModal(true); |
| 56 | |
| 57 | final MenuItemImpl itemImpl = (MenuItemImpl) mSubMenu.getItem(); |
| 58 | final View anchorView = itemImpl.getItemView(MenuBuilder.TYPE_ACTION_BUTTON, null); |
| 59 | mPopup.setAnchorView(anchorView); |
| 60 | |
| 61 | mPopup.setContentWidth(Math.min(measureContentWidth(adapter), mPopupMaxWidth)); |
| 62 | mPopup.show(); |
| 63 | } |
| 64 | |
| 65 | public void dismiss() { |
| 66 | mPopup.dismiss(); |
| 67 | mPopup = null; |
| 68 | } |
| 69 | |
| 70 | public void onItemClick(AdapterView<?> parent, View view, int position, long id) { |
| 71 | mSubMenu.performItemAction(mSubMenu.getItem(position), 0); |
| 72 | mPopup.dismiss(); |
| 73 | } |
| 74 | |
| 75 | private int measureContentWidth(MenuAdapter adapter) { |
| 76 | // Menus don't tend to be long, so this is more sane than it looks. |
| 77 | int width = 0; |
| 78 | View itemView = null; |
| 79 | final int widthMeasureSpec = |
| 80 | MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); |
| 81 | final int heightMeasureSpec = |
| 82 | MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); |
| 83 | final int count = adapter.getCount(); |
| 84 | for (int i = 0; i < count; i++) { |
| 85 | itemView = adapter.getView(i, itemView, null); |
| 86 | itemView.measure(widthMeasureSpec, heightMeasureSpec); |
| 87 | width = Math.max(width, itemView.getMeasuredWidth()); |
| 88 | } |
| 89 | return width; |
| 90 | } |
| 91 | } |