1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.inputmethod.keyboard.internal; 18 19 import android.content.Context; 20 import android.util.AttributeSet; 21 import android.widget.ScrollView; 22 23 /** 24 * This is an extended {@link ScrollView} that can notify 25 * {@link ScrollView#onScrollChanged(int,int,int,int} and 26 * {@link ScrollView#onOverScrolled(int,int,int,int)} to a content view. 27 */ 28 public class ScrollViewWithNotifier extends ScrollView { 29 private ScrollListener mScrollListener = EMPTY_LISTER; 30 31 public interface ScrollListener { notifyScrollChanged(int scrollX, int scrollY, int oldX, int oldY)32 public void notifyScrollChanged(int scrollX, int scrollY, int oldX, int oldY); notifyOverScrolled(int scrollX, int scrollY, boolean clampedX, boolean clampedY)33 public void notifyOverScrolled(int scrollX, int scrollY, boolean clampedX, 34 boolean clampedY); 35 } 36 37 private static final ScrollListener EMPTY_LISTER = new ScrollListener() { 38 @Override 39 public void notifyScrollChanged(int scrollX, int scrollY, int oldX, int oldY) {} 40 @Override 41 public void notifyOverScrolled(int scrollX, int scrollY, boolean clampedX, 42 boolean clampedY) {} 43 }; 44 ScrollViewWithNotifier(final Context context, final AttributeSet attrs)45 public ScrollViewWithNotifier(final Context context, final AttributeSet attrs) { 46 super(context, attrs); 47 } 48 49 @Override onScrollChanged(final int scrollX, final int scrollY, final int oldX, final int oldY)50 protected void onScrollChanged(final int scrollX, final int scrollY, final int oldX, 51 final int oldY) { 52 super.onScrollChanged(scrollX, scrollY, oldX, oldY); 53 mScrollListener.notifyScrollChanged(scrollX, scrollY, oldX, oldY); 54 } 55 56 @Override onOverScrolled(final int scrollX, final int scrollY, final boolean clampedX, final boolean clampedY)57 protected void onOverScrolled(final int scrollX, final int scrollY, final boolean clampedX, 58 final boolean clampedY) { 59 super.onOverScrolled(scrollX, scrollY, clampedX, clampedY); 60 mScrollListener.notifyOverScrolled(scrollX, scrollY, clampedX, clampedY); 61 } 62 setScrollListener(final ScrollListener listener)63 public void setScrollListener(final ScrollListener listener) { 64 mScrollListener = listener; 65 } 66 } 67