ScrollingMovementMethod.java revision 8f34567c71003505456a9b1a0d461a4e62883d70
19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2006 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.text.method; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.MotionEvent; 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.text.*; 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.widget.TextView; 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.View; 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2467b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown/** 2567b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown * A movement method that interprets movement keys by scrolling the text buffer. 2667b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown */ 2767b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brownpublic class ScrollingMovementMethod extends BaseMovementMethod implements MovementMethod { 2867b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown @Override 2967b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown protected boolean left(TextView widget, Spannable buffer) { 308f34567c71003505456a9b1a0d461a4e62883d70Jeff Brown return scrollLeft(widget, buffer, 1); 3167b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown } 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3367b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown @Override 3467b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown protected boolean right(TextView widget, Spannable buffer) { 358f34567c71003505456a9b1a0d461a4e62883d70Jeff Brown return scrollRight(widget, buffer, 1); 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3867b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown @Override 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected boolean up(TextView widget, Spannable buffer) { 408f34567c71003505456a9b1a0d461a4e62883d70Jeff Brown return scrollUp(widget, buffer, 1); 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4367b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown @Override 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected boolean down(TextView widget, Spannable buffer) { 458f34567c71003505456a9b1a0d461a4e62883d70Jeff Brown return scrollDown(widget, buffer, 1); 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4867b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown @Override 4967b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown protected boolean pageUp(TextView widget, Spannable buffer) { 508f34567c71003505456a9b1a0d461a4e62883d70Jeff Brown return scrollPageUp(widget, buffer); 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5367b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown @Override 5467b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown protected boolean pageDown(TextView widget, Spannable buffer) { 558f34567c71003505456a9b1a0d461a4e62883d70Jeff Brown return scrollPageDown(widget, buffer); 5667b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown } 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5867b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown @Override 5967b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown protected boolean top(TextView widget, Spannable buffer) { 608f34567c71003505456a9b1a0d461a4e62883d70Jeff Brown return scrollTop(widget, buffer); 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6367b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown @Override 6467b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown protected boolean bottom(TextView widget, Spannable buffer) { 658f34567c71003505456a9b1a0d461a4e62883d70Jeff Brown return scrollBottom(widget, buffer); 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6867b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown @Override 6967b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown protected boolean lineStart(TextView widget, Spannable buffer) { 708f34567c71003505456a9b1a0d461a4e62883d70Jeff Brown return scrollLineStart(widget, buffer); 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7267b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown 7367b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown @Override 7467b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown protected boolean lineEnd(TextView widget, Spannable buffer) { 758f34567c71003505456a9b1a0d461a4e62883d70Jeff Brown return scrollLineEnd(widget, buffer); 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7767b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown 7867b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown @Override 7967b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown protected boolean home(TextView widget, Spannable buffer) { 8067b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown return top(widget, buffer); 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8367b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown @Override 8467b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown protected boolean end(TextView widget, Spannable buffer) { 8567b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown return bottom(widget, buffer); 8667b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown } 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8867b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown @Override 8967b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown public boolean onTouchEvent(TextView widget, Spannable buffer, MotionEvent event) { 9067b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown return Touch.onTouchEvent(widget, buffer, event); 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9367b6ab72ae96a9f2be929de2c32c110df5390fddJeff Brown @Override 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void onTakeFocus(TextView widget, Spannable text, int dir) { 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Layout layout = widget.getLayout(); 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (layout != null && (dir & View.FOCUS_FORWARD) != 0) { 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project widget.scrollTo(widget.getScrollX(), 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project layout.getLineTop(0)); 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (layout != null && (dir & View.FOCUS_BACKWARD) != 0) { 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int padding = widget.getTotalPaddingTop() + 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project widget.getTotalPaddingBottom(); 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int line = layout.getLineCount() - 1; 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project widget.scrollTo(widget.getScrollX(), 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project layout.getLineTop(line+1) - 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (widget.getHeight() - padding)); 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static MovementMethod getInstance() { 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (sInstance == null) 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project sInstance = new ScrollingMovementMethod(); 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return sInstance; 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static ScrollingMovementMethod sInstance; 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 121