| /* |
| * 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.text.Layout; |
| import android.text.Selection; |
| import android.text.Spannable; |
| import android.view.KeyEvent; |
| import android.view.MotionEvent; |
| import android.view.View; |
| import android.widget.TextView; |
| import android.widget.TextView.CursorController; |
| |
| // 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 { |
| /** |
| * An optional controller for the cursor. |
| * Use {@link #setCursorController(CursorController)} to set this field. |
| */ |
| protected CursorController mCursorController; |
| |
| private boolean isCap(Spannable buffer) { |
| return ((MetaKeyKeyListener.getMetaState(buffer, KeyEvent.META_SHIFT_ON) == 1) || |
| (MetaKeyKeyListener.getMetaState(buffer, MetaKeyKeyListener.META_SELECTING) != 0)); |
| } |
| |
| private boolean isAlt(Spannable buffer) { |
| return MetaKeyKeyListener.getMetaState(buffer, KeyEvent.META_ALT_ON) == 1; |
| } |
| |
| private boolean up(TextView widget, Spannable buffer) { |
| boolean cap = isCap(buffer); |
| boolean alt = isAlt(buffer); |
| 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 = isCap(buffer); |
| boolean alt = isAlt(buffer); |
| 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 = isCap(buffer); |
| boolean alt = isAlt(buffer); |
| 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 = isCap(buffer); |
| boolean alt = isAlt(buffer); |
| 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); |
| } |
| } |
| } |
| |
| 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) && |
| (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) { |
| if (mCursorController != null) { |
| mCursorController.hide(); |
| } |
| return false; |
| } |
| |
| public boolean onTouchEvent(TextView widget, Spannable buffer, MotionEvent event) { |
| if (mCursorController != null) { |
| return onTouchEventCursor(widget, buffer, event); |
| } else { |
| return onTouchEventStandard(widget, buffer, event); |
| } |
| } |
| |
| private boolean onTouchEventStandard(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 = isCap(buffer); |
| if (cap) { |
| int offset = widget.getOffset((int) event.getX(), (int) event.getY()); |
| |
| 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 if (event.getAction() == MotionEvent.ACTION_MOVE) { |
| boolean cap = isCap(buffer); |
| |
| 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 long press |
| widget.cancelLongPress(); |
| |
| // Update selection as we're moving the selection area. |
| |
| // Get the current touch position |
| int offset = widget.getOffset((int) event.getX(), (int) event.getY()); |
| |
| 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 offset = widget.getOffset((int) event.getX(), (int) event.getY()); |
| if (isCap(buffer)) { |
| buffer.removeSpan(LAST_TAP_DOWN); |
| Selection.extendSelection(buffer, offset); |
| } else { |
| Selection.setSelection(buffer, offset); |
| } |
| |
| MetaKeyKeyListener.adjustMetaAfterKeypress(buffer); |
| MetaKeyKeyListener.resetLockedMeta(buffer); |
| |
| return true; |
| } |
| } |
| |
| return handled; |
| } |
| |
| private boolean onTouchEventCursor(TextView widget, Spannable buffer, MotionEvent event) { |
| if (widget.isFocused() && !widget.didTouchFocusSelect()) { |
| switch (event.getActionMasked()) { |
| case MotionEvent.ACTION_MOVE: |
| widget.cancelLongPress(); |
| |
| // Offset the current touch position (from controller to cursor) |
| final float x = event.getX() + mCursorController.getOffsetX(); |
| final float y = event.getY() + mCursorController.getOffsetY(); |
| int offset = widget.getOffset((int) x, (int) y); |
| mCursorController.updatePosition(offset); |
| return true; |
| |
| case MotionEvent.ACTION_UP: |
| case MotionEvent.ACTION_CANCEL: |
| mCursorController = null; |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Defines the cursor controller. |
| * |
| * When set, this object can be used to handle events, that can be translated in cursor updates. |
| * @param cursorController A cursor controller implementation |
| */ |
| public void setCursorController(CursorController cursorController) { |
| mCursorController = cursorController; |
| } |
| |
| 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; |
| } |