1 /* 2 * Copyright (C) 2006 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 android.text.method; 18 19 import android.text.Layout; 20 import android.text.Selection; 21 import android.text.Spannable; 22 import android.view.KeyEvent; 23 import android.view.MotionEvent; 24 import android.view.View; 25 import android.widget.TextView; 26 27 // XXX this doesn't extend MetaKeyKeyListener because the signatures 28 // don't match. Need to figure that out. Meanwhile the meta keys 29 // won't work in fields that don't take input. 30 31 public class ArrowKeyMovementMethod implements MovementMethod { 32 private boolean isCap(Spannable buffer) { 33 return ((MetaKeyKeyListener.getMetaState(buffer, KeyEvent.META_SHIFT_ON) == 1) || 34 (MetaKeyKeyListener.getMetaState(buffer, MetaKeyKeyListener.META_SELECTING) != 0)); 35 } 36 37 private boolean isAlt(Spannable buffer) { 38 return MetaKeyKeyListener.getMetaState(buffer, KeyEvent.META_ALT_ON) == 1; 39 } 40 41 private boolean up(TextView widget, Spannable buffer) { 42 boolean cap = isCap(buffer); 43 boolean alt = isAlt(buffer); 44 Layout layout = widget.getLayout(); 45 46 if (cap) { 47 if (alt) { 48 Selection.extendSelection(buffer, 0); 49 return true; 50 } else { 51 return Selection.extendUp(buffer, layout); 52 } 53 } else { 54 if (alt) { 55 Selection.setSelection(buffer, 0); 56 return true; 57 } else { 58 return Selection.moveUp(buffer, layout); 59 } 60 } 61 } 62 63 private boolean down(TextView widget, Spannable buffer) { 64 boolean cap = isCap(buffer); 65 boolean alt = isAlt(buffer); 66 Layout layout = widget.getLayout(); 67 68 if (cap) { 69 if (alt) { 70 Selection.extendSelection(buffer, buffer.length()); 71 return true; 72 } else { 73 return Selection.extendDown(buffer, layout); 74 } 75 } else { 76 if (alt) { 77 Selection.setSelection(buffer, buffer.length()); 78 return true; 79 } else { 80 return Selection.moveDown(buffer, layout); 81 } 82 } 83 } 84 85 private boolean left(TextView widget, Spannable buffer) { 86 boolean cap = isCap(buffer); 87 boolean alt = isAlt(buffer); 88 Layout layout = widget.getLayout(); 89 90 if (cap) { 91 if (alt) { 92 return Selection.extendToLeftEdge(buffer, layout); 93 } else { 94 return Selection.extendLeft(buffer, layout); 95 } 96 } else { 97 if (alt) { 98 return Selection.moveToLeftEdge(buffer, layout); 99 } else { 100 return Selection.moveLeft(buffer, layout); 101 } 102 } 103 } 104 105 private boolean right(TextView widget, Spannable buffer) { 106 boolean cap = isCap(buffer); 107 boolean alt = isAlt(buffer); 108 Layout layout = widget.getLayout(); 109 110 if (cap) { 111 if (alt) { 112 return Selection.extendToRightEdge(buffer, layout); 113 } else { 114 return Selection.extendRight(buffer, layout); 115 } 116 } else { 117 if (alt) { 118 return Selection.moveToRightEdge(buffer, layout); 119 } else { 120 return Selection.moveRight(buffer, layout); 121 } 122 } 123 } 124 125 public boolean onKeyDown(TextView widget, Spannable buffer, int keyCode, KeyEvent event) { 126 if (executeDown(widget, buffer, keyCode)) { 127 MetaKeyKeyListener.adjustMetaAfterKeypress(buffer); 128 MetaKeyKeyListener.resetLockedMeta(buffer); 129 return true; 130 } 131 132 return false; 133 } 134 135 private boolean executeDown(TextView widget, Spannable buffer, int keyCode) { 136 boolean handled = false; 137 138 switch (keyCode) { 139 case KeyEvent.KEYCODE_DPAD_UP: 140 handled |= up(widget, buffer); 141 break; 142 143 case KeyEvent.KEYCODE_DPAD_DOWN: 144 handled |= down(widget, buffer); 145 break; 146 147 case KeyEvent.KEYCODE_DPAD_LEFT: 148 handled |= left(widget, buffer); 149 break; 150 151 case KeyEvent.KEYCODE_DPAD_RIGHT: 152 handled |= right(widget, buffer); 153 break; 154 155 case KeyEvent.KEYCODE_DPAD_CENTER: 156 if ((MetaKeyKeyListener.getMetaState(buffer, MetaKeyKeyListener.META_SELECTING) != 0) && 157 (widget.showContextMenu())) { 158 handled = true; 159 } 160 } 161 162 if (handled) { 163 MetaKeyKeyListener.adjustMetaAfterKeypress(buffer); 164 MetaKeyKeyListener.resetLockedMeta(buffer); 165 } 166 167 return handled; 168 } 169 170 public boolean onKeyUp(TextView widget, Spannable buffer, int keyCode, KeyEvent event) { 171 return false; 172 } 173 174 public boolean onKeyOther(TextView view, Spannable text, KeyEvent event) { 175 int code = event.getKeyCode(); 176 if (code != KeyEvent.KEYCODE_UNKNOWN && event.getAction() == KeyEvent.ACTION_MULTIPLE) { 177 int repeat = event.getRepeatCount(); 178 boolean handled = false; 179 while ((--repeat) > 0) { 180 handled |= executeDown(view, text, code); 181 } 182 return handled; 183 } 184 return false; 185 } 186 187 public boolean onTrackballEvent(TextView widget, Spannable text, MotionEvent event) { 188 return false; 189 } 190 191 public boolean onTouchEvent(TextView widget, Spannable buffer, MotionEvent event) { 192 int initialScrollX = -1, initialScrollY = -1; 193 if (event.getAction() == MotionEvent.ACTION_UP) { 194 initialScrollX = Touch.getInitialScrollX(widget, buffer); 195 initialScrollY = Touch.getInitialScrollY(widget, buffer); 196 } 197 198 boolean handled = Touch.onTouchEvent(widget, buffer, event); 199 200 if (widget.isFocused() && !widget.didTouchFocusSelect()) { 201 if (event.getAction() == MotionEvent.ACTION_DOWN) { 202 boolean cap = isCap(buffer); 203 if (cap) { 204 int offset = widget.getOffset((int) event.getX(), (int) event.getY()); 205 206 buffer.setSpan(LAST_TAP_DOWN, offset, offset, Spannable.SPAN_POINT_POINT); 207 208 // Disallow intercepting of the touch events, so that 209 // users can scroll and select at the same time. 210 // without this, users would get booted out of select 211 // mode once the view detected it needed to scroll. 212 widget.getParent().requestDisallowInterceptTouchEvent(true); 213 } 214 } else if (event.getAction() == MotionEvent.ACTION_MOVE) { 215 boolean cap = isCap(buffer); 216 217 if (cap && handled) { 218 // Before selecting, make sure we've moved out of the "slop". 219 // handled will be true, if we're in select mode AND we're 220 // OUT of the slop 221 222 // Turn long press off while we're selecting. User needs to 223 // re-tap on the selection to enable long press 224 widget.cancelLongPress(); 225 226 // Update selection as we're moving the selection area. 227 228 // Get the current touch position 229 int offset = widget.getOffset((int) event.getX(), (int) event.getY()); 230 231 Selection.extendSelection(buffer, offset); 232 return true; 233 } 234 } else if (event.getAction() == MotionEvent.ACTION_UP) { 235 // If we have scrolled, then the up shouldn't move the cursor, 236 // but we do need to make sure the cursor is still visible at 237 // the current scroll offset to avoid the scroll jumping later 238 // to show it. 239 if ((initialScrollY >= 0 && initialScrollY != widget.getScrollY()) || 240 (initialScrollX >= 0 && initialScrollX != widget.getScrollX())) { 241 widget.moveCursorToVisibleOffset(); 242 return true; 243 } 244 245 int offset = widget.getOffset((int) event.getX(), (int) event.getY()); 246 if (isCap(buffer)) { 247 buffer.removeSpan(LAST_TAP_DOWN); 248 Selection.extendSelection(buffer, offset); 249 } else { 250 Selection.setSelection(buffer, offset); 251 } 252 253 MetaKeyKeyListener.adjustMetaAfterKeypress(buffer); 254 MetaKeyKeyListener.resetLockedMeta(buffer); 255 256 return true; 257 } 258 } 259 260 return handled; 261 } 262 263 public boolean canSelectArbitrarily() { 264 return true; 265 } 266 267 public void initialize(TextView widget, Spannable text) { 268 Selection.setSelection(text, 0); 269 } 270 271 public void onTakeFocus(TextView view, Spannable text, int dir) { 272 if ((dir & (View.FOCUS_FORWARD | View.FOCUS_DOWN)) != 0) { 273 if (view.getLayout() == null) { 274 // This shouldn't be null, but do something sensible if it is. 275 Selection.setSelection(text, text.length()); 276 } 277 } else { 278 Selection.setSelection(text, text.length()); 279 } 280 } 281 282 public static MovementMethod getInstance() { 283 if (sInstance == null) { 284 sInstance = new ArrowKeyMovementMethod(); 285 } 286 287 return sInstance; 288 } 289 290 291 private static final Object LAST_TAP_DOWN = new Object(); 292 private static ArrowKeyMovementMethod sInstance; 293 } 294
