| /* |
| * 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.view.MotionEvent; |
| import android.text.*; |
| import android.widget.TextView; |
| import android.view.View; |
| |
| /** |
| * A movement method that interprets movement keys by scrolling the text buffer. |
| */ |
| public class ScrollingMovementMethod extends BaseMovementMethod implements MovementMethod { |
| @Override |
| protected boolean left(TextView widget, Spannable buffer) { |
| return scrollLeft(widget, buffer, 1); |
| } |
| |
| @Override |
| protected boolean right(TextView widget, Spannable buffer) { |
| return scrollRight(widget, buffer, 1); |
| } |
| |
| @Override |
| protected boolean up(TextView widget, Spannable buffer) { |
| return scrollUp(widget, buffer, 1); |
| } |
| |
| @Override |
| protected boolean down(TextView widget, Spannable buffer) { |
| return scrollDown(widget, buffer, 1); |
| } |
| |
| @Override |
| protected boolean pageUp(TextView widget, Spannable buffer) { |
| return scrollPageUp(widget, buffer); |
| } |
| |
| @Override |
| protected boolean pageDown(TextView widget, Spannable buffer) { |
| return scrollPageDown(widget, buffer); |
| } |
| |
| @Override |
| protected boolean top(TextView widget, Spannable buffer) { |
| return scrollTop(widget, buffer); |
| } |
| |
| @Override |
| protected boolean bottom(TextView widget, Spannable buffer) { |
| return scrollBottom(widget, buffer); |
| } |
| |
| @Override |
| protected boolean lineStart(TextView widget, Spannable buffer) { |
| return scrollLineStart(widget, buffer); |
| } |
| |
| @Override |
| protected boolean lineEnd(TextView widget, Spannable buffer) { |
| return scrollLineEnd(widget, buffer); |
| } |
| |
| @Override |
| protected boolean home(TextView widget, Spannable buffer) { |
| return top(widget, buffer); |
| } |
| |
| @Override |
| protected boolean end(TextView widget, Spannable buffer) { |
| return bottom(widget, buffer); |
| } |
| |
| @Override |
| public boolean onTouchEvent(TextView widget, Spannable buffer, MotionEvent event) { |
| return Touch.onTouchEvent(widget, buffer, event); |
| } |
| |
| @Override |
| public void onTakeFocus(TextView widget, Spannable text, int dir) { |
| Layout layout = widget.getLayout(); |
| |
| if (layout != null && (dir & View.FOCUS_FORWARD) != 0) { |
| widget.scrollTo(widget.getScrollX(), |
| layout.getLineTop(0)); |
| } |
| if (layout != null && (dir & View.FOCUS_BACKWARD) != 0) { |
| int padding = widget.getTotalPaddingTop() + |
| widget.getTotalPaddingBottom(); |
| int line = layout.getLineCount() - 1; |
| |
| widget.scrollTo(widget.getScrollX(), |
| layout.getLineTop(line+1) - |
| (widget.getHeight() - padding)); |
| } |
| } |
| |
| public static MovementMethod getInstance() { |
| if (sInstance == null) |
| sInstance = new ScrollingMovementMethod(); |
| |
| return sInstance; |
| } |
| |
| private static ScrollingMovementMethod sInstance; |
| } |