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/*
* 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.Spannable;
import android.view.MotionEvent;
import android.view.View;
import android.widget.TextView;
/**
* 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;
}
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