The Android Open Source Project | ba6d7b8 | 2008-10-21 07:00:00 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2008 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.browser; |
| 18 | |
| 19 | import android.content.Context; |
| 20 | import android.util.Config; |
| 21 | import android.view.ContextMenu; |
| 22 | import android.view.ContextMenu.ContextMenuInfo; |
| 23 | import android.view.KeyEvent; |
| 24 | import android.view.MenuInflater; |
| 25 | import android.view.MenuItem; |
| 26 | import android.view.View; |
| 27 | import android.view.View.OnCreateContextMenuListener; |
| 28 | import android.webkit.WebView; |
| 29 | import android.widget.AdapterView; |
| 30 | import android.widget.AdapterView.OnItemClickListener; |
| 31 | import android.widget.GridView; |
| 32 | |
| 33 | /** |
| 34 | * This class implements a Grid layout of Views for the Tab picker. |
| 35 | */ |
| 36 | class ImageGrid extends GridView implements OnItemClickListener, |
| 37 | OnCreateContextMenuListener { |
| 38 | |
| 39 | private Listener mListener; |
| 40 | private ImageAdapter mAdapter; |
| 41 | private boolean mIsLive; |
| 42 | public static final int CANCEL = -99; |
| 43 | public static final int NEW_TAB = -1; |
| 44 | |
| 45 | /** |
| 46 | * Constructor |
| 47 | * @param context Context to use when inflating resources. |
| 48 | * @param live TRUE if the view can accept touch or click |
| 49 | * @param l Listener to respond to clicks etc. |
| 50 | */ |
| 51 | public ImageGrid(Context context, boolean live, Listener l) { |
| 52 | super(context); |
| 53 | |
| 54 | mIsLive = live; |
| 55 | if (live) { |
| 56 | setFocusable(true); |
| 57 | setFocusableInTouchMode(true); |
| 58 | setOnItemClickListener(this); |
| 59 | setOnCreateContextMenuListener(this); |
| 60 | } |
| 61 | if (Config.DEBUG && l == null) { |
| 62 | throw new AssertionError(); |
| 63 | } |
| 64 | mListener = l; |
| 65 | |
| 66 | mAdapter = new ImageAdapter(context, this, null, live); |
| 67 | setAdapter(mAdapter); |
| 68 | |
| 69 | // android.R.color.window_background seems to return transparent? |
| 70 | // setBackgroundColor(android.R.color.window_background); |
| 71 | setBackgroundColor(0xFF000000); |
| 72 | |
| 73 | setPadding(0, 10, 0, 10); |
| 74 | setVerticalSpacing(10); |
| 75 | setHorizontalSpacing(10); |
| 76 | setNumColumns(2); |
| 77 | setStretchMode(GridView.STRETCH_COLUMN_WIDTH); |
| 78 | } |
| 79 | |
| 80 | @Override |
| 81 | public boolean dispatchKeyEvent(KeyEvent event) { |
| 82 | // We always consume the BACK key even if mListener is null or the |
| 83 | // ImageGrid is not "live." This prevents crashes during tab animations |
| 84 | // if the user presses BACK. |
| 85 | if ((event.getAction() == KeyEvent.ACTION_DOWN) && |
| 86 | (event.getKeyCode() == KeyEvent.KEYCODE_BACK)) { |
| 87 | if (mListener != null && mIsLive) { |
| 88 | mListener.onClick(CANCEL); |
| 89 | invalidate(); |
| 90 | } |
| 91 | return true; |
| 92 | } |
| 93 | return super.dispatchKeyEvent(event); |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * Called by BrowserActivity to add a new window to the tab picker. |
| 98 | * This does not happen dynamically, this only happens during view |
| 99 | * setup. |
| 100 | * |
| 101 | * @param v Webview of the tab to add |
| 102 | * @param name Web page title |
| 103 | * @param url URL of the webpage |
| 104 | */ |
| 105 | public void add(TabControl.Tab t) { |
| 106 | mAdapter.add(t); |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * Called by BrowserActivity when a window has been removed from the |
| 111 | * tab list. |
| 112 | * |
| 113 | * @param index Window to remove, from 0 to MAX_TABS-1 |
| 114 | */ |
| 115 | public void remove(int index) { |
| 116 | if (Config.DEBUG && (index < 0 || index >= TabControl.MAX_TABS)) { |
| 117 | throw new AssertionError(); |
| 118 | } |
| 119 | mAdapter.remove(index); |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * Request focus to initially set to a particular tab. |
| 124 | * |
| 125 | * @param startingIndex This is a Tab index from 0 - MAX_TABS-1 and does not |
| 126 | * include the "New Tab" cell. |
| 127 | */ |
| 128 | public void setCurrentIndex(int startingIndex) { |
| 129 | if (!mAdapter.maxedOut()) { |
| 130 | startingIndex++; |
| 131 | } |
| 132 | setSelection(startingIndex); |
| 133 | } |
| 134 | |
| 135 | public Listener getListener() { |
| 136 | return mListener; |
| 137 | } |
| 138 | |
| 139 | public void setListener(Listener l) { |
| 140 | mListener = l; |
| 141 | } |
| 142 | |
| 143 | /** |
| 144 | * Return true if the ImageGrid is live. This means that tabs can be chosen |
| 145 | * and the menu can be invoked. |
| 146 | */ |
| 147 | public boolean isLive() { |
| 148 | return mIsLive; |
| 149 | } |
| 150 | |
| 151 | /** |
| 152 | * Do some internal cleanup of the ImageGrid's adapter. |
| 153 | */ |
| 154 | public void clear() { |
| 155 | mAdapter.clear(); |
| 156 | } |
| 157 | |
| 158 | /* (non-Javadoc) |
| 159 | * @see android.widget.AdapterView.OnItemClickListener#onItemClick(android.widget.AdapterView, android.view.View, int, long) |
| 160 | */ |
| 161 | public void onItemClick(AdapterView parent, View v, int position, long id) { |
| 162 | if (!mAdapter.maxedOut()) { |
| 163 | position--; |
| 164 | } |
| 165 | // Position will be -1 for the "New Tab" cell. |
| 166 | if (mListener != null) { |
| 167 | mListener.onClick(position); |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | /* (non-Javadoc) |
| 172 | * @see android.view.View.OnCreateContextMenuListener#onCreateContextMenu(android.view.ContextMenu, android.view.View, java.lang.Object) |
| 173 | */ |
| 174 | public void onCreateContextMenu(ContextMenu menu, View v, |
| 175 | ContextMenuInfo menuInfo) { |
| 176 | // Do not create the context menu if there is no listener or the Tab |
| 177 | // overview is not "live." |
| 178 | if (mListener == null || !mIsLive) { |
| 179 | return; |
| 180 | } |
| 181 | AdapterView.AdapterContextMenuInfo info = |
| 182 | (AdapterView.AdapterContextMenuInfo) menuInfo; |
| 183 | boolean maxed = mAdapter.maxedOut(); |
| 184 | if (info.position > 0 || maxed) { |
| 185 | MenuInflater inflater = new MenuInflater(mContext); |
| 186 | inflater.inflate(R.menu.tabscontext, menu); |
| 187 | int position = info.position; |
| 188 | if (!maxed) { |
| 189 | position--; |
| 190 | } |
| 191 | menu.setHeaderTitle(mAdapter.mItems.get(position).getTitle()); |
| 192 | |
| 193 | // If we only have one active tab left, don't add the remove option |
| 194 | if (mAdapter.mItems.size() <= 1) { |
| 195 | menu.findItem(R.id.remove_tab_menu_id).setVisible(false); |
| 196 | } |
| 197 | } |
| 198 | } |
| 199 | |
| 200 | // convert a context menu position to an actual tab position. Since context |
| 201 | // menus are not created for the "New Tab" cell, this will always return a |
| 202 | // valid tab position. |
| 203 | public int getContextMenuPosition(MenuItem menu) { |
| 204 | AdapterView.AdapterContextMenuInfo info = |
| 205 | (AdapterView.AdapterContextMenuInfo) menu.getMenuInfo(); |
| 206 | int pos = info.position; |
| 207 | if (!mAdapter.maxedOut()) { |
| 208 | pos--; |
| 209 | } |
| 210 | return pos; |
| 211 | } |
| 212 | |
| 213 | @Override |
| 214 | protected void onSizeChanged(int w, int h, int oldw, int oldh) { |
| 215 | // Called when our orientation changes. Replace the adapter with one |
| 216 | // that has the appropriate dimensions. |
| 217 | mAdapter = new ImageAdapter(mContext, this, mAdapter.mItems, mIsLive); |
| 218 | setAdapter(mAdapter); |
| 219 | super.onSizeChanged(w, h, oldw, oldh); |
| 220 | } |
| 221 | |
| 222 | /** |
| 223 | * Listener to be notified by behavior of ImageGrid. |
| 224 | */ |
| 225 | public interface Listener { |
| 226 | /** |
| 227 | * Called when enter is pressed on the list. |
| 228 | * @param position The index of the selected image when |
| 229 | * enter is pressed. |
| 230 | */ |
| 231 | void onClick(int position); |
| 232 | |
| 233 | /** |
| 234 | * Called when remove is called on the grid. |
| 235 | */ |
| 236 | void remove(int position); |
| 237 | } |
| 238 | |
| 239 | } |