| /* |
| * Copyright (C) 2006 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.text.method; |
| |
| import android.util.Log; |
| import android.view.KeyEvent; |
| import android.graphics.Rect; |
| import android.text.*; |
| import android.widget.TextView; |
| import android.view.View; |
| import android.view.ViewConfiguration; |
| import android.view.MotionEvent; |
| |
| // XXX this doesn't extend MetaKeyKeyListener because the signatures |
| // don't match. Need to figure that out. Meanwhile the meta keys |
| // won't work in fields that don't take input. |
| |
| public class |
| ArrowKeyMovementMethod |
| implements MovementMethod |
| { |
| private boolean up(TextView widget, Spannable buffer) { |
| boolean cap = (MetaKeyKeyListener.getMetaState(buffer, |
| KeyEvent.META_SHIFT_ON) == 1) || |
| (MetaKeyKeyListener.getMetaState(buffer, |
| MetaKeyKeyListener.META_SELECTING) != 0); |
| boolean alt = MetaKeyKeyListener.getMetaState(buffer, |
| KeyEvent.META_ALT_ON) == 1; |
| Layout layout = widget.getLayout(); |
| |
| if (cap) { |
| if (alt) { |
| Selection.extendSelection(buffer, 0); |
| return true; |
| } else { |
| return Selection.extendUp(buffer, layout); |
| } |
| } else { |
| if (alt) { |
| Selection.setSelection(buffer, 0); |
| return true; |
| } else { |
| return Selection.moveUp(buffer, layout); |
| } |
| } |
| } |
| |
| private boolean down(TextView widget, Spannable buffer) { |
| boolean cap = (MetaKeyKeyListener.getMetaState(buffer, |
| KeyEvent.META_SHIFT_ON) == 1) || |
| (MetaKeyKeyListener.getMetaState(buffer, |
| MetaKeyKeyListener.META_SELECTING) != 0); |
| boolean alt = MetaKeyKeyListener.getMetaState(buffer, |
| KeyEvent.META_ALT_ON) == 1; |
| Layout layout = widget.getLayout(); |
| |
| if (cap) { |
| if (alt) { |
| Selection.extendSelection(buffer, buffer.length()); |
| return true; |
| } else { |
| return Selection.extendDown(buffer, layout); |
| } |
| } else { |
| if (alt) { |
| Selection.setSelection(buffer, buffer.length()); |
| return true; |
| } else { |
| return Selection.moveDown(buffer, layout); |
| } |
| } |
| } |
| |
| private boolean left(TextView widget, Spannable buffer) { |
| boolean cap = (MetaKeyKeyListener.getMetaState(buffer, |
| KeyEvent.META_SHIFT_ON) == 1) || |
| (MetaKeyKeyListener.getMetaState(buffer, |
| MetaKeyKeyListener.META_SELECTING) != 0); |
| boolean alt = MetaKeyKeyListener.getMetaState(buffer, |
| KeyEvent.META_ALT_ON) == 1; |
| Layout layout = widget.getLayout(); |
| |
| if (cap) { |
| if (alt) { |
| return Selection.extendToLeftEdge(buffer, layout); |
| } else { |
| return Selection.extendLeft(buffer, layout); |
| } |
| } else { |
| if (alt) { |
| return Selection.moveToLeftEdge(buffer, layout); |
| } else { |
| return Selection.moveLeft(buffer, layout); |
| } |
| } |
| } |
| |
| private boolean right(TextView widget, Spannable buffer) { |
| boolean cap = (MetaKeyKeyListener.getMetaState(buffer, |
| KeyEvent.META_SHIFT_ON) == 1) || |
| (MetaKeyKeyListener.getMetaState(buffer, |
| MetaKeyKeyListener.META_SELECTING) != 0); |
| boolean alt = MetaKeyKeyListener.getMetaState(buffer, |
| KeyEvent.META_ALT_ON) == 1; |
| Layout layout = widget.getLayout(); |
| |
| if (cap) { |
| if (alt) { |
| return Selection.extendToRightEdge(buffer, layout); |
| } else { |
| return Selection.extendRight(buffer, layout); |
| } |
| } else { |
| if (alt) { |
| return Selection.moveToRightEdge(buffer, layout); |
| } else { |
| return Selection.moveRight(buffer, layout); |
| } |
| } |
| } |
| |
| private int getOffset(int x, int y, TextView widget){ |
| // Converts the absolute X,Y coordinates to the character offset for the |
| // character whose position is closest to the specified |
| // horizontal position. |
| x -= widget.getTotalPaddingLeft(); |
| y -= widget.getTotalPaddingTop(); |
| |
| // Clamp the position to inside of the view. |
| if (x < 0) { |
| x = 0; |
| } else if (x >= (widget.getWidth()-widget.getTotalPaddingRight())) { |
| x = widget.getWidth()-widget.getTotalPaddingRight() - 1; |
| } |
| if (y < 0) { |
| y = 0; |
| } else if (y >= (widget.getHeight()-widget.getTotalPaddingBottom())) { |
| y = widget.getHeight()-widget.getTotalPaddingBottom() - 1; |
| } |
| |
| x += widget.getScrollX(); |
| y += widget.getScrollY(); |
| |
| Layout layout = widget.getLayout(); |
| int line = layout.getLineForVertical(y); |
| |
| int offset = layout.getOffsetForHorizontal(line, x); |
| return offset; |
| } |
| |
| public boolean onKeyDown(TextView widget, Spannable buffer, int keyCode, KeyEvent event) { |
| if (executeDown(widget, buffer, keyCode)) { |
| MetaKeyKeyListener.adjustMetaAfterKeypress(buffer); |
| MetaKeyKeyListener.resetLockedMeta(buffer); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| private boolean executeDown(TextView widget, Spannable buffer, int keyCode) { |
| boolean handled = false; |
| |
| switch (keyCode) { |
| case KeyEvent.KEYCODE_DPAD_UP: |
| handled |= up(widget, buffer); |
| break; |
| |
| case KeyEvent.KEYCODE_DPAD_DOWN: |
| handled |= down(widget, buffer); |
| break; |
| |
| case KeyEvent.KEYCODE_DPAD_LEFT: |
| handled |= left(widget, buffer); |
| break; |
| |
| case KeyEvent.KEYCODE_DPAD_RIGHT: |
| handled |= right(widget, buffer); |
| break; |
| |
| case KeyEvent.KEYCODE_DPAD_CENTER: |
| if (MetaKeyKeyListener.getMetaState(buffer, MetaKeyKeyListener.META_SELECTING) != 0) { |
| if (widget.showContextMenu()) { |
| handled = true; |
| } |
| } |
| } |
| |
| if (handled) { |
| MetaKeyKeyListener.adjustMetaAfterKeypress(buffer); |
| MetaKeyKeyListener.resetLockedMeta(buffer); |
| } |
| |
| return handled; |
| } |
| |
| public boolean onKeyUp(TextView widget, Spannable buffer, int keyCode, KeyEvent event) { |
| return false; |
| } |
| |
| public boolean onKeyOther(TextView view, Spannable text, KeyEvent event) { |
| int code = event.getKeyCode(); |
| if (code != KeyEvent.KEYCODE_UNKNOWN |
| && event.getAction() == KeyEvent.ACTION_MULTIPLE) { |
| int repeat = event.getRepeatCount(); |
| boolean handled = false; |
| while ((--repeat) > 0) { |
| handled |= executeDown(view, text, code); |
| } |
| return handled; |
| } |
| return false; |
| } |
| |
| public boolean onTrackballEvent(TextView widget, Spannable text, |
| MotionEvent event) { |
| return false; |
| } |
| |
| public boolean onTouchEvent(TextView widget, Spannable buffer, |
| MotionEvent event) { |
| int initialScrollX = -1, initialScrollY = -1; |
| if (event.getAction() == MotionEvent.ACTION_UP) { |
| initialScrollX = Touch.getInitialScrollX(widget, buffer); |
| initialScrollY = Touch.getInitialScrollY(widget, buffer); |
| } |
| |
| boolean handled = Touch.onTouchEvent(widget, buffer, event); |
| |
| if (widget.isFocused() && !widget.didTouchFocusSelect()) { |
| if (event.getAction() == MotionEvent.ACTION_DOWN) { |
| boolean cap = (MetaKeyKeyListener.getMetaState(buffer, |
| KeyEvent.META_SHIFT_ON) == 1) || |
| (MetaKeyKeyListener.getMetaState(buffer, |
| MetaKeyKeyListener.META_SELECTING) != 0); |
| int x = (int) event.getX(); |
| int y = (int) event.getY(); |
| int offset = getOffset(x, y, widget); |
| |
| if (cap) { |
| buffer.setSpan(LAST_TAP_DOWN, offset, offset, |
| Spannable.SPAN_POINT_POINT); |
| |
| // Disallow intercepting of the touch events, so that |
| // users can scroll and select at the same time. |
| // without this, users would get booted out of select |
| // mode once the view detected it needed to scroll. |
| widget.getParent().requestDisallowInterceptTouchEvent(true); |
| } else { |
| OnePointFiveTapState[] tap = buffer.getSpans(0, buffer.length(), |
| OnePointFiveTapState.class); |
| |
| if (tap.length > 0) { |
| if (event.getEventTime() - tap[0].mWhen <= |
| ViewConfiguration.getDoubleTapTimeout() && |
| sameWord(buffer, offset, Selection.getSelectionEnd(buffer))) { |
| |
| tap[0].active = true; |
| MetaKeyKeyListener.startSelecting(widget, buffer); |
| widget.getParent().requestDisallowInterceptTouchEvent(true); |
| buffer.setSpan(LAST_TAP_DOWN, offset, offset, |
| Spannable.SPAN_POINT_POINT); |
| } |
| |
| tap[0].mWhen = event.getEventTime(); |
| } else { |
| OnePointFiveTapState newtap = new OnePointFiveTapState(); |
| newtap.mWhen = event.getEventTime(); |
| newtap.active = false; |
| buffer.setSpan(newtap, 0, buffer.length(), |
| Spannable.SPAN_INCLUSIVE_INCLUSIVE); |
| } |
| } |
| } else if (event.getAction() == MotionEvent.ACTION_MOVE) { |
| boolean cap = (MetaKeyKeyListener.getMetaState(buffer, |
| KeyEvent.META_SHIFT_ON) == 1) || |
| (MetaKeyKeyListener.getMetaState(buffer, |
| MetaKeyKeyListener.META_SELECTING) != 0); |
| |
| if (cap && handled) { |
| // Before selecting, make sure we've moved out of the "slop". |
| // handled will be true, if we're in select mode AND we're |
| // OUT of the slop |
| |
| // Turn long press off while we're selecting. User needs to |
| // re-tap on the selection to enable longpress |
| widget.cancelLongPress(); |
| |
| // Update selection as we're moving the selection area. |
| |
| // Get the current touch position |
| int x = (int) event.getX(); |
| int y = (int) event.getY(); |
| int offset = getOffset(x, y, widget); |
| |
| final OnePointFiveTapState[] tap = buffer.getSpans(0, buffer.length(), |
| OnePointFiveTapState.class); |
| |
| if (tap.length > 0 && tap[0].active) { |
| // Get the last down touch position (the position at which the |
| // user started the selection) |
| int lastDownOffset = buffer.getSpanStart(LAST_TAP_DOWN); |
| |
| // Compute the selection boundaries |
| int spanstart; |
| int spanend; |
| if (offset >= lastDownOffset) { |
| // Expand from word start of the original tap to new word |
| // end, since we are selecting "forwards" |
| spanstart = findWordStart(buffer, lastDownOffset); |
| spanend = findWordEnd(buffer, offset); |
| } else { |
| // Expand to from new word start to word end of the original |
| // tap since we are selecting "backwards". |
| // The spanend will always need to be associated with the touch |
| // up position, so that refining the selection with the |
| // trackball will work as expected. |
| spanstart = findWordEnd(buffer, lastDownOffset); |
| spanend = findWordStart(buffer, offset); |
| } |
| Selection.setSelection(buffer, spanstart, spanend); |
| } else { |
| Selection.extendSelection(buffer, offset); |
| } |
| return true; |
| } |
| } else if (event.getAction() == MotionEvent.ACTION_UP) { |
| // If we have scrolled, then the up shouldn't move the cursor, |
| // but we do need to make sure the cursor is still visible at |
| // the current scroll offset to avoid the scroll jumping later |
| // to show it. |
| if ((initialScrollY >= 0 && initialScrollY != widget.getScrollY()) || |
| (initialScrollX >= 0 && initialScrollX != widget.getScrollX())) { |
| widget.moveCursorToVisibleOffset(); |
| return true; |
| } |
| |
| int x = (int) event.getX(); |
| int y = (int) event.getY(); |
| int off = getOffset(x, y, widget); |
| |
| // XXX should do the same adjust for x as we do for the line. |
| |
| OnePointFiveTapState[] onepointfivetap = buffer.getSpans(0, buffer.length(), |
| OnePointFiveTapState.class); |
| if (onepointfivetap.length > 0 && onepointfivetap[0].active && |
| Selection.getSelectionStart(buffer) == Selection.getSelectionEnd(buffer)) { |
| // If we've set select mode, because there was a onepointfivetap, |
| // but there was no ensuing swipe gesture, undo the select mode |
| // and remove reference to the last onepointfivetap. |
| MetaKeyKeyListener.stopSelecting(widget, buffer); |
| for (int i=0; i < onepointfivetap.length; i++) { |
| buffer.removeSpan(onepointfivetap[i]); |
| } |
| buffer.removeSpan(LAST_TAP_DOWN); |
| } |
| boolean cap = (MetaKeyKeyListener.getMetaState(buffer, |
| KeyEvent.META_SHIFT_ON) == 1) || |
| (MetaKeyKeyListener.getMetaState(buffer, |
| MetaKeyKeyListener.META_SELECTING) != 0); |
| |
| DoubleTapState[] tap = buffer.getSpans(0, buffer.length(), |
| DoubleTapState.class); |
| boolean doubletap = false; |
| |
| if (tap.length > 0) { |
| if (event.getEventTime() - tap[0].mWhen <= |
| ViewConfiguration.getDoubleTapTimeout() && |
| sameWord(buffer, off, Selection.getSelectionEnd(buffer))) { |
| |
| doubletap = true; |
| } |
| |
| tap[0].mWhen = event.getEventTime(); |
| } else { |
| DoubleTapState newtap = new DoubleTapState(); |
| newtap.mWhen = event.getEventTime(); |
| buffer.setSpan(newtap, 0, buffer.length(), |
| Spannable.SPAN_INCLUSIVE_INCLUSIVE); |
| } |
| |
| if (cap) { |
| buffer.removeSpan(LAST_TAP_DOWN); |
| if (onepointfivetap.length > 0 && onepointfivetap[0].active) { |
| // If we selecting something with the onepointfivetap-and |
| // swipe gesture, stop it on finger up. |
| MetaKeyKeyListener.stopSelecting(widget, buffer); |
| } else { |
| Selection.extendSelection(buffer, off); |
| } |
| } else if (doubletap) { |
| Selection.setSelection(buffer, |
| findWordStart(buffer, off), |
| findWordEnd(buffer, off)); |
| } else { |
| Selection.setSelection(buffer, off); |
| } |
| |
| MetaKeyKeyListener.adjustMetaAfterKeypress(buffer); |
| MetaKeyKeyListener.resetLockedMeta(buffer); |
| |
| return true; |
| } |
| } |
| |
| return handled; |
| } |
| |
| private static class DoubleTapState implements NoCopySpan { |
| long mWhen; |
| } |
| |
| /* We check for a onepointfive tap. This is similar to |
| * doubletap gesture (where a finger goes down, up, down, up, in a short |
| * time period), except in the onepointfive tap, a users finger only needs |
| * to go down, up, down in a short time period. We detect this type of tap |
| * to implement the onepointfivetap-and-swipe selection gesture. |
| * This gesture allows users to select a segment of text without going |
| * through the "select text" option in the context menu. |
| */ |
| private static class OnePointFiveTapState implements NoCopySpan { |
| long mWhen; |
| boolean active; |
| } |
| |
| private static boolean sameWord(CharSequence text, int one, int two) { |
| int start = findWordStart(text, one); |
| int end = findWordEnd(text, one); |
| |
| if (end == start) { |
| return false; |
| } |
| |
| return start == findWordStart(text, two) && |
| end == findWordEnd(text, two); |
| } |
| |
| // TODO: Unify with TextView.getWordForDictionary() |
| private static int findWordStart(CharSequence text, int start) { |
| for (; start > 0; start--) { |
| char c = text.charAt(start - 1); |
| int type = Character.getType(c); |
| |
| if (c != '\'' && |
| type != Character.UPPERCASE_LETTER && |
| type != Character.LOWERCASE_LETTER && |
| type != Character.TITLECASE_LETTER && |
| type != Character.MODIFIER_LETTER && |
| type != Character.DECIMAL_DIGIT_NUMBER) { |
| break; |
| } |
| } |
| |
| return start; |
| } |
| |
| // TODO: Unify with TextView.getWordForDictionary() |
| private static int findWordEnd(CharSequence text, int end) { |
| int len = text.length(); |
| |
| for (; end < len; end++) { |
| char c = text.charAt(end); |
| int type = Character.getType(c); |
| |
| if (c != '\'' && |
| type != Character.UPPERCASE_LETTER && |
| type != Character.LOWERCASE_LETTER && |
| type != Character.TITLECASE_LETTER && |
| type != Character.MODIFIER_LETTER && |
| type != Character.DECIMAL_DIGIT_NUMBER) { |
| break; |
| } |
| } |
| |
| return end; |
| } |
| |
| public boolean canSelectArbitrarily() { |
| return true; |
| } |
| |
| public void initialize(TextView widget, Spannable text) { |
| Selection.setSelection(text, 0); |
| } |
| |
| public void onTakeFocus(TextView view, Spannable text, int dir) { |
| if ((dir & (View.FOCUS_FORWARD | View.FOCUS_DOWN)) != 0) { |
| Layout layout = view.getLayout(); |
| |
| if (layout == null) { |
| /* |
| * This shouldn't be null, but do something sensible if it is. |
| */ |
| Selection.setSelection(text, text.length()); |
| } else { |
| /* |
| * Put the cursor at the end of the first line, which is |
| * either the last offset if there is only one line, or the |
| * offset before the first character of the second line |
| * if there is more than one line. |
| */ |
| if (layout.getLineCount() == 1) { |
| Selection.setSelection(text, text.length()); |
| } else { |
| Selection.setSelection(text, layout.getLineStart(1) - 1); |
| } |
| } |
| } else { |
| Selection.setSelection(text, text.length()); |
| } |
| } |
| |
| public static MovementMethod getInstance() { |
| if (sInstance == null) |
| sInstance = new ArrowKeyMovementMethod(); |
| |
| return sInstance; |
| } |
| |
| |
| private static final Object LAST_TAP_DOWN = new Object(); |
| private static ArrowKeyMovementMethod sInstance; |
| } |