Android Open Source - android-gskbyte-utils Indexable List View

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License

The source code is released under:

GNU Lesser General Public License

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Java Source Code

/*
 * Copyright 2011 woozzu// w  ww  .jav a 2s .c o m
 *
 * Modified in 2013 by Jos? Alcal? Correa
 * 
 * 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 com.woozzu.android.widget;

import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.widget.ListAdapter;
import android.widget.ListView;

public class IndexableListView extends ListView
{
    
private boolean mIsFastScrollEnabled = false;
private IndexScroller mScroller = null;
private GestureDetector mGestureDetector = null;

public IndexableListView(Context context) {
    super(context);
}

public IndexableListView(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public IndexableListView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
}

@Override
public boolean isFastScrollEnabled() {
    return mIsFastScrollEnabled;
}

@Override
public void setFastScrollEnabled(boolean enabled) {
    mIsFastScrollEnabled = enabled;
    if (mIsFastScrollEnabled) {
        if (mScroller == null)
            mScroller = new IndexScroller(getContext(), this);
    } else {
        if (mScroller != null) {
            mScroller.hide();
            mScroller = null;
        }
    }
}

@Override
public void draw(Canvas canvas) {
    super.draw(canvas);
    
    // Overlay index bar
    if (mScroller != null)
        mScroller.draw(canvas);
}

@Override
public boolean onTouchEvent(MotionEvent ev) {
    // Intercept ListView's touch event
    if (mScroller != null && mScroller.onTouchEvent(ev))
        return true;
    
    if (mGestureDetector == null) {
        mGestureDetector = new GestureDetector(getContext(), new GestureDetector.SimpleOnGestureListener() {

            @Override
            public boolean onFling(MotionEvent e1, MotionEvent e2,
                    float velocityX, float velocityY) {
                // If fling happens, index bar shows
                mScroller.show();
                return super.onFling(e1, e2, velocityX, velocityY);
            }
            
        });
    }
    mGestureDetector.onTouchEvent(ev);
    
    return super.onTouchEvent(ev);
}

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    return true;
}

@Override
public void setAdapter(ListAdapter adapter) {
    super.setAdapter(adapter);
    if (mScroller != null)
        mScroller.setAdapter(adapter);
}

@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);
    if (mScroller != null)
        mScroller.onSizeChanged(w, h, oldw, oldh);
}

}

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