Android Open Source - yammp Slider View

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Back to project page yammp.

License

The source code is released under:

GNU Lesser General Public License

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Java Source Code

package org.yammp.view;
// w  ww  . j a  va  2 s .co m
import android.content.Context;
import android.graphics.Color;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;

public class SliderView extends View implements OnGestureListener, OnTouchListener {

  private int mHeight = 0;

  private int mMaxValue = 16;
  private float mDelta = 0;
  private int mColor = Color.WHITE;
  private GestureDetector mGestureDetector;

  private OnValueChangeListener mListener;

  public SliderView(Context context) {
    super(context);
    init(context);
  }

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

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

  @Override
  public boolean onDown(MotionEvent e) {
    mDelta = 0;
    return false;
  }

  @Override
  public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
    return false;
  }

  @Override
  public void onLongPress(MotionEvent e) {
    mDelta = 0;
  }

  @Override
  public boolean onScroll(MotionEvent event1, MotionEvent event2, float distanceX, float distanceY) {

    if (mDelta >= 1 || mDelta <= -1) {
      if (mListener != null) {
        mListener.onValueChanged((int) mDelta);
      }
      mDelta = 0;
    } else {
      mDelta += mMaxValue * distanceY / mHeight * 2;
    }
    return false;
  }

  @Override
  public void onShowPress(MotionEvent e) {

  }

  @Override
  public boolean onSingleTapUp(MotionEvent e) {
    return false;
  }

  @Override
  public void onSizeChanged(int w, int h, int oldw, int oldh) {
    mHeight = getHeight();
  }

  @Override
  public boolean onTouch(View v, MotionEvent event) {

    int action = event.getAction();
    if (action == MotionEvent.ACTION_DOWN) {
      v.setBackgroundColor(Color.argb(0x33, Color.red(mColor), Color.green(mColor),
          Color.blue(mColor)));
    } else if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) {
      v.setBackgroundColor(Color.TRANSPARENT);
    }
    mGestureDetector.onTouchEvent(event);
    return true;
  }

  public void setColor(int color) {
    mColor = color;
  }

  public void setMax(int max) {
    mMaxValue = max;
  }

  public void setOnValueChangeListener(OnValueChangeListener listener) {
    mListener = listener;
  }

  private void init(Context context) {
    setOnTouchListener(this);
    mGestureDetector = new GestureDetector(context, this);
    mHeight = getHeight();
  }

  public interface OnValueChangeListener {

    void onValueChanged(int value);
  }

}

Java Source Code List