src/com/android/music/VerticalTextSpinner.java - platform/packages/apps/Music - Git at Google

 /*
  * Copyright (C) 2008 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 com.android.music;

 import android.content.Context;
 import android.graphics.Canvas;
 import android.graphics.Paint;
 import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
 import android.graphics.drawable.NinePatchDrawable;
 import android.text.TextPaint;
 import android.util.AttributeSet;
 import android.util.Log;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
 import android.view.View;


 public class VerticalTextSpinner extends View {

     private static final int SELECTOR_ARROW_HEIGHT = 15;

     private static int TEXT_SPACING;
     private static int TEXT_MARGIN_RIGHT;
     private static int TEXT_SIZE;
     private static int TEXT1_Y;
     private static int TEXT2_Y;
     private static int TEXT3_Y;
     private static int TEXT4_Y;
     private static int TEXT5_Y;
     private static int SCROLL_DISTANCE;

     private static final int SCROLL_MODE_NONE = 0;
     private static final int SCROLL_MODE_UP = 1;
     private static final int SCROLL_MODE_DOWN = 2;

     private static final long DEFAULT_SCROLL_INTERVAL_MS = 400;
     private static final int MIN_ANIMATIONS = 4;

     private final Drawable mBackgroundFocused;
     private final Drawable mSelectorFocused;
     private final Drawable mSelectorNormal;
     private final int mSelectorDefaultY;
     private final int mSelectorMinY;
     private final int mSelectorMaxY;
     private final int mSelectorHeight;
     private final TextPaint mTextPaintDark;
     private final TextPaint mTextPaintLight;

     private int mSelectorY;
     private Drawable mSelector;
     private int mDownY;
     private boolean isDraggingSelector;
     private int mScrollMode;
     private long mScrollInterval;
     private boolean mIsAnimationRunning;
     private boolean mStopAnimation;
     private boolean mWrapAround = true;

     private int mTotalAnimatedDistance;
     private int mNumberOfAnimations;
     private long mDelayBetweenAnimations;
     private int mDistanceOfEachAnimation;

     private String[] mTextList;
     private int mCurrentSelectedPos;
     private OnChangedListener mListener;

     private String mText1;
     private String mText2;
     private String mText3;
     private String mText4;
     private String mText5;

     public interface OnChangedListener {
         void onChanged(
                 VerticalTextSpinner spinner, int oldPos, int newPos, String[] items);
     }

     public VerticalTextSpinner(Context context) {
         this(context, null);
     }

     public VerticalTextSpinner(Context context, AttributeSet attrs) {
         this(context, attrs, 0);
     }

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

         float scale = getResources().getDisplayMetrics().density;
         TEXT_SPACING = (int)(18 * scale);
         TEXT_MARGIN_RIGHT = (int)(25 * scale);
         TEXT_SIZE = (int)(22 * scale);
         SCROLL_DISTANCE = TEXT_SIZE + TEXT_SPACING;
         TEXT1_Y = (TEXT_SIZE * (-2 + 2)) + (TEXT_SPACING * (-2 + 1));
         TEXT2_Y = (TEXT_SIZE * (-1 + 2)) + (TEXT_SPACING * (-1 + 1));
         TEXT3_Y = (TEXT_SIZE * (0 + 2)) + (TEXT_SPACING * (0 + 1));
         TEXT4_Y = (TEXT_SIZE * (1 + 2)) + (TEXT_SPACING * (1 + 1));
         TEXT5_Y = (TEXT_SIZE * (2 + 2)) + (TEXT_SPACING * (2 + 1));

         mBackgroundFocused = context.getResources().getDrawable(R.drawable.pickerbox_background);
         mSelectorFocused = context.getResources().getDrawable(R.drawable.pickerbox_selected);
         mSelectorNormal = context.getResources().getDrawable(R.drawable.pickerbox_unselected);

         mSelectorHeight = mSelectorFocused.getIntrinsicHeight();
         mSelectorDefaultY = (mBackgroundFocused.getIntrinsicHeight() - mSelectorHeight) / 2;
         mSelectorMinY = 0;
         mSelectorMaxY = mBackgroundFocused.getIntrinsicHeight() - mSelectorHeight;

         mSelector = mSelectorNormal;
         mSelectorY = mSelectorDefaultY;

         mTextPaintDark = new TextPaint(Paint.ANTI_ALIAS_FLAG);
         mTextPaintDark.setTextSize(TEXT_SIZE);
         mTextPaintDark.setColor(context.getResources()
             .getColor(android.R.color.primary_text_light));

         mTextPaintLight = new TextPaint(Paint.ANTI_ALIAS_FLAG);
         mTextPaintLight.setTextSize(TEXT_SIZE);
         mTextPaintLight.setColor(context.getResources()
             .getColor(android.R.color.secondary_text_dark));

         mScrollMode = SCROLL_MODE_NONE;
         mScrollInterval = DEFAULT_SCROLL_INTERVAL_MS;
         calculateAnimationValues();
     }

     public void setOnChangeListener(OnChangedListener listener) {
         mListener = listener;
     }

     public void setItems(String[] textList) {
         mTextList = textList;
         calculateTextPositions();
     }

     public void setSelectedPos(int selectedPos) {
         mCurrentSelectedPos = selectedPos;
         calculateTextPositions();
         postInvalidate();
     }

     public void setScrollInterval(long interval) {
         mScrollInterval = interval;
         calculateAnimationValues();
     }

     public void setWrapAround(boolean wrap) {
         mWrapAround = wrap;
     }

     @Override
     public boolean onKeyDown(int keyCode, KeyEvent event) {

         /* This is a bit confusing, when we get the key event
          * DPAD_DOWN we actually roll the spinner up. When the
          * key event is DPAD_UP we roll the spinner down.
          */
         if ((keyCode == KeyEvent.KEYCODE_DPAD_UP) && canScrollDown()) {
             mScrollMode = SCROLL_MODE_DOWN;
             scroll();
             mStopAnimation = true;
             return true;
         } else if ((keyCode == KeyEvent.KEYCODE_DPAD_DOWN) && canScrollUp()) {
             mScrollMode = SCROLL_MODE_UP;
             scroll();
             mStopAnimation = true;
             return true;
         }
         return super.onKeyDown(keyCode, event);
     }

     private boolean canScrollDown() {
         return (mCurrentSelectedPos > 0) || mWrapAround;
     }

     private boolean canScrollUp() {
         return ((mCurrentSelectedPos < (mTextList.length - 1)) || mWrapAround);
     }

     @Override
     protected void onFocusChanged(boolean gainFocus, int direction,
             Rect previouslyFocusedRect) {
         if (gainFocus) {
             setBackgroundDrawable(mBackgroundFocused);
             mSelector = mSelectorFocused;
         } else {
             setBackgroundDrawable(null);
             mSelector = mSelectorNormal;
             mSelectorY = mSelectorDefaultY;
         }
     }

     @Override
     public boolean onTouchEvent(MotionEvent event) {
         final int action = event.getAction();
         final int y = (int) event.getY();

         switch (action) {
         case MotionEvent.ACTION_DOWN:
             requestFocus();
             mDownY = y;
             isDraggingSelector = (y >= mSelectorY) &&
                     (y <= (mSelectorY + mSelector.getIntrinsicHeight()));
             break;

         case MotionEvent.ACTION_MOVE:
             if (isDraggingSelector) {
                 int top = mSelectorDefaultY + (y - mDownY);
                 if (top <= mSelectorMinY && canScrollDown()) {
                     mSelectorY = mSelectorMinY;
                     mStopAnimation = false;
                     if (mScrollMode != SCROLL_MODE_DOWN) {
                         mScrollMode = SCROLL_MODE_DOWN;
                         scroll();
                     }
                 } else if (top >= mSelectorMaxY && canScrollUp()) {
                     mSelectorY = mSelectorMaxY;
                     mStopAnimation = false;
                     if (mScrollMode != SCROLL_MODE_UP) {
                         mScrollMode = SCROLL_MODE_UP;
                         scroll();
                     }
                 } else {
                     mSelectorY = top;
                     mStopAnimation = true;
                 }
             }
             break;

         case MotionEvent.ACTION_UP:
         case MotionEvent.ACTION_CANCEL:
         default:
             mSelectorY = mSelectorDefaultY;
             mStopAnimation = true;
             invalidate();
             break;
         }
         return true;
     }

     @Override
     protected void onDraw(Canvas canvas) {

         /* The bounds of the selector */
         final int selectorLeft = 0;
         final int selectorTop = mSelectorY;
         final int selectorRight = getWidth();
         final int selectorBottom = mSelectorY + mSelectorHeight;

         /* Draw the selector */
         mSelector.setBounds(selectorLeft, selectorTop, selectorRight, selectorBottom);
         mSelector.draw(canvas);

         if (mTextList == null) {

             /* We're not setup with values so don't draw anything else */
             return;
         }

         final TextPaint textPaintDark = mTextPaintDark;
         if (hasFocus()) {

             /* The bounds of the top area where the text should be light */
             final int topLeft = 0;
             final int topTop = 0;
             final int topRight = selectorRight;
             final int topBottom = selectorTop + SELECTOR_ARROW_HEIGHT;

             /* Assign a bunch of local finals for performance */
             final String text1 = mText1;
             final String text2 = mText2;
             final String text3 = mText3;
             final String text4 = mText4;
             final String text5 = mText5;
             final TextPaint textPaintLight = mTextPaintLight;

             /*
              * Draw the 1st, 2nd and 3rd item in light only, clip it so it only
              * draws in the area above the selector
              */
             canvas.save();
             canvas.clipRect(topLeft, topTop, topRight, topBottom);
             drawText(canvas, text1, TEXT1_Y
                     + mTotalAnimatedDistance, textPaintLight);
             drawText(canvas, text2, TEXT2_Y
                     + mTotalAnimatedDistance, textPaintLight);
             drawText(canvas, text3,
                     TEXT3_Y + mTotalAnimatedDistance, textPaintLight);
             canvas.restore();

             /*
              * Draw the 2nd, 3rd and 4th clipped to the selector bounds in dark
              * paint
              */
             canvas.save();
             canvas.clipRect(selectorLeft, selectorTop + SELECTOR_ARROW_HEIGHT,
                     selectorRight, selectorBottom - SELECTOR_ARROW_HEIGHT);
             drawText(canvas, text2, TEXT2_Y
                     + mTotalAnimatedDistance, textPaintDark);
             drawText(canvas, text3,
                     TEXT3_Y + mTotalAnimatedDistance, textPaintDark);
             drawText(canvas, text4,
                     TEXT4_Y + mTotalAnimatedDistance, textPaintDark);
             canvas.restore();

             /* The bounds of the bottom area where the text should be light */
             final int bottomLeft = 0;
             final int bottomTop = selectorBottom - SELECTOR_ARROW_HEIGHT;
             final int bottomRight = selectorRight;
             final int bottomBottom = getMeasuredHeight();

             /*
              * Draw the 3rd, 4th and 5th in white text, clip it so it only draws
              * in the area below the selector.
              */
             canvas.save();
             canvas.clipRect(bottomLeft, bottomTop, bottomRight, bottomBottom);
             drawText(canvas, text3,
                     TEXT3_Y + mTotalAnimatedDistance, textPaintLight);
             drawText(canvas, text4,
                     TEXT4_Y + mTotalAnimatedDistance, textPaintLight);
             drawText(canvas, text5,
                     TEXT5_Y + mTotalAnimatedDistance, textPaintLight);
             canvas.restore();

         } else {
             drawText(canvas, mText3, TEXT3_Y, textPaintDark);
         }
         if (mIsAnimationRunning) {
             if ((Math.abs(mTotalAnimatedDistance) + mDistanceOfEachAnimation) > SCROLL_DISTANCE) {
                 mTotalAnimatedDistance = 0;
                 if (mScrollMode == SCROLL_MODE_UP) {
                     int oldPos = mCurrentSelectedPos;
                     int newPos = getNewIndex(1);
                     if (newPos >= 0) {
                         mCurrentSelectedPos = newPos;
                         if (mListener != null) {
                             mListener.onChanged(this, oldPos, mCurrentSelectedPos, mTextList);
                         }
                     }
                     if (newPos < 0 || ((newPos >= mTextList.length - 1) && !mWrapAround)) {
                         mStopAnimation = true;
                     }
                     calculateTextPositions();
                 } else if (mScrollMode == SCROLL_MODE_DOWN) {
                     int oldPos = mCurrentSelectedPos;
                     int newPos = getNewIndex(-1);
                     if (newPos >= 0) {
                         mCurrentSelectedPos = newPos;
                         if (mListener != null) {
                             mListener.onChanged(this, oldPos, mCurrentSelectedPos, mTextList);
                         }
                     }
                     if (newPos < 0 || (newPos == 0 && !mWrapAround)) {
                         mStopAnimation = true;
                     }
                     calculateTextPositions();
                 }
                 if (mStopAnimation) {
                     final int previousScrollMode = mScrollMode;

                     /* No longer scrolling, we wait till the current animation
                      * completes then we stop.
                      */
                     mIsAnimationRunning = false;
                     mStopAnimation = false;
                     mScrollMode = SCROLL_MODE_NONE;

                     /* If the current selected item is an empty string
                      * scroll past it.
                      */
                     if ("".equals(mTextList[mCurrentSelectedPos])) {
                        mScrollMode = previousScrollMode;
                        scroll();
                        mStopAnimation = true;
                     }
                 }
             } else {
                 if (mScrollMode == SCROLL_MODE_UP) {
                     mTotalAnimatedDistance -= mDistanceOfEachAnimation;
                 } else if (mScrollMode == SCROLL_MODE_DOWN) {
                     mTotalAnimatedDistance += mDistanceOfEachAnimation;
                 }
             }
             if (mDelayBetweenAnimations > 0) {
                 postInvalidateDelayed(mDelayBetweenAnimations);
             } else {
                 invalidate();
             }
         }
     }

     /**
      * Called every time the text items or current position
      * changes. We calculate store we don't have to calculate
      * onDraw.
      */
     private void calculateTextPositions() {
         mText1 = getTextToDraw(-2);
         mText2 = getTextToDraw(-1);
         mText3 = getTextToDraw(0);
         mText4 = getTextToDraw(1);
         mText5 = getTextToDraw(2);
     }

     private String getTextToDraw(int offset) {
         int index = getNewIndex(offset);
         if (index < 0) {
             return "";
         }
         return mTextList[index];
     }

     private int getNewIndex(int offset) {
         int index = mCurrentSelectedPos + offset;
         if (index < 0) {
             if (mWrapAround) {
                 index += mTextList.length;
             } else {
                 return -1;
             }
         } else if (index >= mTextList.length) {
             if (mWrapAround) {
                 index -= mTextList.length;
             } else {
                 return -1;
             }
         }
         return index;
     }

     private void scroll() {
         if (mIsAnimationRunning) {
             return;
         }
         mTotalAnimatedDistance = 0;
         mIsAnimationRunning = true;
         invalidate();
     }

     private void calculateAnimationValues() {
         mNumberOfAnimations = (int) mScrollInterval / SCROLL_DISTANCE;
         if (mNumberOfAnimations < MIN_ANIMATIONS) {
             mNumberOfAnimations = MIN_ANIMATIONS;
             mDistanceOfEachAnimation = SCROLL_DISTANCE / mNumberOfAnimations;
             mDelayBetweenAnimations = 0;
         } else {
             mDistanceOfEachAnimation = SCROLL_DISTANCE / mNumberOfAnimations;
             mDelayBetweenAnimations = mScrollInterval / mNumberOfAnimations;
         }
     }

     private void drawText(Canvas canvas, String text, int y, TextPaint paint) {
         int width = (int) paint.measureText(text);
         int x = getMeasuredWidth() - width - TEXT_MARGIN_RIGHT;
         canvas.drawText(text, x, y, paint);
     }

     public int getCurrentSelectedPos() {
         return mCurrentSelectedPos;
     }
 }
	/*
	* Copyright (C) 2008 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 com.android.music;

	import android.content.Context;
	import android.graphics.Canvas;
	import android.graphics.Paint;
	import android.graphics.Rect;
	import android.graphics.drawable.Drawable;
	import android.graphics.drawable.NinePatchDrawable;
	import android.text.TextPaint;
	import android.util.AttributeSet;
	import android.util.Log;
	import android.view.KeyEvent;
	import android.view.MotionEvent;
	import android.view.View;


	public class VerticalTextSpinner extends View {

	private static final int SELECTOR_ARROW_HEIGHT = 15;

	private static int TEXT_SPACING;
	private static int TEXT_MARGIN_RIGHT;
	private static int TEXT_SIZE;
	private static int TEXT1_Y;
	private static int TEXT2_Y;
	private static int TEXT3_Y;
	private static int TEXT4_Y;
	private static int TEXT5_Y;
	private static int SCROLL_DISTANCE;

	private static final int SCROLL_MODE_NONE = 0;
	private static final int SCROLL_MODE_UP = 1;
	private static final int SCROLL_MODE_DOWN = 2;

	private static final long DEFAULT_SCROLL_INTERVAL_MS = 400;
	private static final int MIN_ANIMATIONS = 4;

	private final Drawable mBackgroundFocused;
	private final Drawable mSelectorFocused;
	private final Drawable mSelectorNormal;
	private final int mSelectorDefaultY;
	private final int mSelectorMinY;
	private final int mSelectorMaxY;
	private final int mSelectorHeight;
	private final TextPaint mTextPaintDark;
	private final TextPaint mTextPaintLight;

	private int mSelectorY;
	private Drawable mSelector;
	private int mDownY;
	private boolean isDraggingSelector;
	private int mScrollMode;
	private long mScrollInterval;
	private boolean mIsAnimationRunning;
	private boolean mStopAnimation;
	private boolean mWrapAround = true;

	private int mTotalAnimatedDistance;
	private int mNumberOfAnimations;
	private long mDelayBetweenAnimations;
	private int mDistanceOfEachAnimation;

	private String[] mTextList;
	private int mCurrentSelectedPos;
	private OnChangedListener mListener;

	private String mText1;
	private String mText2;
	private String mText3;
	private String mText4;
	private String mText5;

	public interface OnChangedListener {
	void onChanged(
	VerticalTextSpinner spinner, int oldPos, int newPos, String[] items);
	}

	public VerticalTextSpinner(Context context) {
	this(context, null);
	}

	public VerticalTextSpinner(Context context, AttributeSet attrs) {
	this(context, attrs, 0);
	}

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

	float scale = getResources().getDisplayMetrics().density;
	TEXT_SPACING = (int)(18 * scale);
	TEXT_MARGIN_RIGHT = (int)(25 * scale);
	TEXT_SIZE = (int)(22 * scale);
	SCROLL_DISTANCE = TEXT_SIZE + TEXT_SPACING;
	TEXT1_Y = (TEXT_SIZE * (-2 + 2)) + (TEXT_SPACING * (-2 + 1));
	TEXT2_Y = (TEXT_SIZE * (-1 + 2)) + (TEXT_SPACING * (-1 + 1));
	TEXT3_Y = (TEXT_SIZE * (0 + 2)) + (TEXT_SPACING * (0 + 1));
	TEXT4_Y = (TEXT_SIZE * (1 + 2)) + (TEXT_SPACING * (1 + 1));
	TEXT5_Y = (TEXT_SIZE * (2 + 2)) + (TEXT_SPACING * (2 + 1));

	mBackgroundFocused = context.getResources().getDrawable(R.drawable.pickerbox_background);
	mSelectorFocused = context.getResources().getDrawable(R.drawable.pickerbox_selected);
	mSelectorNormal = context.getResources().getDrawable(R.drawable.pickerbox_unselected);

	mSelectorHeight = mSelectorFocused.getIntrinsicHeight();
	mSelectorDefaultY = (mBackgroundFocused.getIntrinsicHeight() - mSelectorHeight) / 2;
	mSelectorMinY = 0;
	mSelectorMaxY = mBackgroundFocused.getIntrinsicHeight() - mSelectorHeight;

	mSelector = mSelectorNormal;
	mSelectorY = mSelectorDefaultY;

	mTextPaintDark = new TextPaint(Paint.ANTI_ALIAS_FLAG);
	mTextPaintDark.setTextSize(TEXT_SIZE);
	mTextPaintDark.setColor(context.getResources()
	.getColor(android.R.color.primary_text_light));

	mTextPaintLight = new TextPaint(Paint.ANTI_ALIAS_FLAG);
	mTextPaintLight.setTextSize(TEXT_SIZE);
	mTextPaintLight.setColor(context.getResources()
	.getColor(android.R.color.secondary_text_dark));

	mScrollMode = SCROLL_MODE_NONE;
	mScrollInterval = DEFAULT_SCROLL_INTERVAL_MS;
	calculateAnimationValues();
	}

	public void setOnChangeListener(OnChangedListener listener) {
	mListener = listener;
	}

	public void setItems(String[] textList) {
	mTextList = textList;
	calculateTextPositions();
	}

	public void setSelectedPos(int selectedPos) {
	mCurrentSelectedPos = selectedPos;
	calculateTextPositions();
	postInvalidate();
	}

	public void setScrollInterval(long interval) {
	mScrollInterval = interval;
	calculateAnimationValues();
	}

	public void setWrapAround(boolean wrap) {
	mWrapAround = wrap;
	}

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {

	/* This is a bit confusing, when we get the key event
	* DPAD_DOWN we actually roll the spinner up. When the
	* key event is DPAD_UP we roll the spinner down.
	*/
	if ((keyCode == KeyEvent.KEYCODE_DPAD_UP) && canScrollDown()) {
	mScrollMode = SCROLL_MODE_DOWN;
	scroll();
	mStopAnimation = true;
	return true;
	} else if ((keyCode == KeyEvent.KEYCODE_DPAD_DOWN) && canScrollUp()) {
	mScrollMode = SCROLL_MODE_UP;
	scroll();
	mStopAnimation = true;
	return true;
	}
	return super.onKeyDown(keyCode, event);
	}

	private boolean canScrollDown() {
	return (mCurrentSelectedPos > 0) \|\| mWrapAround;
	}

	private boolean canScrollUp() {
	return ((mCurrentSelectedPos < (mTextList.length - 1)) \|\| mWrapAround);
	}

	@Override
	protected void onFocusChanged(boolean gainFocus, int direction,
	Rect previouslyFocusedRect) {
	if (gainFocus) {
	setBackgroundDrawable(mBackgroundFocused);
	mSelector = mSelectorFocused;
	} else {
	setBackgroundDrawable(null);
	mSelector = mSelectorNormal;
	mSelectorY = mSelectorDefaultY;
	}
	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {
	final int action = event.getAction();
	final int y = (int) event.getY();

	switch (action) {
	case MotionEvent.ACTION_DOWN:
	requestFocus();
	mDownY = y;
	isDraggingSelector = (y >= mSelectorY) &&
	(y <= (mSelectorY + mSelector.getIntrinsicHeight()));
	break;

	case MotionEvent.ACTION_MOVE:
	if (isDraggingSelector) {
	int top = mSelectorDefaultY + (y - mDownY);
	if (top <= mSelectorMinY && canScrollDown()) {
	mSelectorY = mSelectorMinY;
	mStopAnimation = false;
	if (mScrollMode != SCROLL_MODE_DOWN) {
	mScrollMode = SCROLL_MODE_DOWN;
	scroll();
	}
	} else if (top >= mSelectorMaxY && canScrollUp()) {
	mSelectorY = mSelectorMaxY;
	mStopAnimation = false;
	if (mScrollMode != SCROLL_MODE_UP) {
	mScrollMode = SCROLL_MODE_UP;
	scroll();
	}
	} else {
	mSelectorY = top;
	mStopAnimation = true;
	}
	}
	break;

	case MotionEvent.ACTION_UP:
	case MotionEvent.ACTION_CANCEL:
	default:
	mSelectorY = mSelectorDefaultY;
	mStopAnimation = true;
	invalidate();
	break;
	}
	return true;
	}

	@Override
	protected void onDraw(Canvas canvas) {

	/* The bounds of the selector */
	final int selectorLeft = 0;
	final int selectorTop = mSelectorY;
	final int selectorRight = getWidth();
	final int selectorBottom = mSelectorY + mSelectorHeight;

	/* Draw the selector */
	mSelector.setBounds(selectorLeft, selectorTop, selectorRight, selectorBottom);
	mSelector.draw(canvas);

	if (mTextList == null) {

	/* We're not setup with values so don't draw anything else */
	return;
	}

	final TextPaint textPaintDark = mTextPaintDark;
	if (hasFocus()) {

	/* The bounds of the top area where the text should be light */
	final int topLeft = 0;
	final int topTop = 0;
	final int topRight = selectorRight;
	final int topBottom = selectorTop + SELECTOR_ARROW_HEIGHT;

	/* Assign a bunch of local finals for performance */
	final String text1 = mText1;
	final String text2 = mText2;
	final String text3 = mText3;
	final String text4 = mText4;
	final String text5 = mText5;
	final TextPaint textPaintLight = mTextPaintLight;

	/*
	* Draw the 1st, 2nd and 3rd item in light only, clip it so it only
	* draws in the area above the selector
	*/
	canvas.save();
	canvas.clipRect(topLeft, topTop, topRight, topBottom);
	drawText(canvas, text1, TEXT1_Y
	+ mTotalAnimatedDistance, textPaintLight);
	drawText(canvas, text2, TEXT2_Y
	+ mTotalAnimatedDistance, textPaintLight);
	drawText(canvas, text3,
	TEXT3_Y + mTotalAnimatedDistance, textPaintLight);
	canvas.restore();

	/*
	* Draw the 2nd, 3rd and 4th clipped to the selector bounds in dark
	* paint
	*/
	canvas.save();
	canvas.clipRect(selectorLeft, selectorTop + SELECTOR_ARROW_HEIGHT,
	selectorRight, selectorBottom - SELECTOR_ARROW_HEIGHT);
	drawText(canvas, text2, TEXT2_Y
	+ mTotalAnimatedDistance, textPaintDark);
	drawText(canvas, text3,
	TEXT3_Y + mTotalAnimatedDistance, textPaintDark);
	drawText(canvas, text4,
	TEXT4_Y + mTotalAnimatedDistance, textPaintDark);
	canvas.restore();

	/* The bounds of the bottom area where the text should be light */
	final int bottomLeft = 0;
	final int bottomTop = selectorBottom - SELECTOR_ARROW_HEIGHT;
	final int bottomRight = selectorRight;
	final int bottomBottom = getMeasuredHeight();

	/*
	* Draw the 3rd, 4th and 5th in white text, clip it so it only draws
	* in the area below the selector.
	*/
	canvas.save();
	canvas.clipRect(bottomLeft, bottomTop, bottomRight, bottomBottom);
	drawText(canvas, text3,
	TEXT3_Y + mTotalAnimatedDistance, textPaintLight);
	drawText(canvas, text4,
	TEXT4_Y + mTotalAnimatedDistance, textPaintLight);
	drawText(canvas, text5,
	TEXT5_Y + mTotalAnimatedDistance, textPaintLight);
	canvas.restore();

	} else {
	drawText(canvas, mText3, TEXT3_Y, textPaintDark);
	}
	if (mIsAnimationRunning) {
	if ((Math.abs(mTotalAnimatedDistance) + mDistanceOfEachAnimation) > SCROLL_DISTANCE) {
	mTotalAnimatedDistance = 0;
	if (mScrollMode == SCROLL_MODE_UP) {
	int oldPos = mCurrentSelectedPos;
	int newPos = getNewIndex(1);
	if (newPos >= 0) {
	mCurrentSelectedPos = newPos;
	if (mListener != null) {
	mListener.onChanged(this, oldPos, mCurrentSelectedPos, mTextList);
	}
	}
	if (newPos < 0 \|\| ((newPos >= mTextList.length - 1) && !mWrapAround)) {
	mStopAnimation = true;
	}
	calculateTextPositions();
	} else if (mScrollMode == SCROLL_MODE_DOWN) {
	int oldPos = mCurrentSelectedPos;
	int newPos = getNewIndex(-1);
	if (newPos >= 0) {
	mCurrentSelectedPos = newPos;
	if (mListener != null) {
	mListener.onChanged(this, oldPos, mCurrentSelectedPos, mTextList);
	}
	}
	if (newPos < 0 \|\| (newPos == 0 && !mWrapAround)) {
	mStopAnimation = true;
	}
	calculateTextPositions();
	}
	if (mStopAnimation) {
	final int previousScrollMode = mScrollMode;

	/* No longer scrolling, we wait till the current animation
	* completes then we stop.
	*/
	mIsAnimationRunning = false;
	mStopAnimation = false;
	mScrollMode = SCROLL_MODE_NONE;

	/* If the current selected item is an empty string
	* scroll past it.
	*/
	if ("".equals(mTextList[mCurrentSelectedPos])) {
	mScrollMode = previousScrollMode;
	scroll();
	mStopAnimation = true;
	}
	}
	} else {
	if (mScrollMode == SCROLL_MODE_UP) {
	mTotalAnimatedDistance -= mDistanceOfEachAnimation;
	} else if (mScrollMode == SCROLL_MODE_DOWN) {
	mTotalAnimatedDistance += mDistanceOfEachAnimation;
	}
	}
	if (mDelayBetweenAnimations > 0) {
	postInvalidateDelayed(mDelayBetweenAnimations);
	} else {
	invalidate();
	}
	}
	}

	/**
	* Called every time the text items or current position
	* changes. We calculate store we don't have to calculate
	* onDraw.
	*/
	private void calculateTextPositions() {
	mText1 = getTextToDraw(-2);
	mText2 = getTextToDraw(-1);
	mText3 = getTextToDraw(0);
	mText4 = getTextToDraw(1);
	mText5 = getTextToDraw(2);
	}

	private String getTextToDraw(int offset) {
	int index = getNewIndex(offset);
	if (index < 0) {
	return "";
	}
	return mTextList[index];
	}

	private int getNewIndex(int offset) {
	int index = mCurrentSelectedPos + offset;
	if (index < 0) {
	if (mWrapAround) {
	index += mTextList.length;
	} else {
	return -1;
	}
	} else if (index >= mTextList.length) {
	if (mWrapAround) {
	index -= mTextList.length;
	} else {
	return -1;
	}
	}
	return index;
	}

	private void scroll() {
	if (mIsAnimationRunning) {
	return;
	}
	mTotalAnimatedDistance = 0;
	mIsAnimationRunning = true;
	invalidate();
	}

	private void calculateAnimationValues() {
	mNumberOfAnimations = (int) mScrollInterval / SCROLL_DISTANCE;
	if (mNumberOfAnimations < MIN_ANIMATIONS) {
	mNumberOfAnimations = MIN_ANIMATIONS;
	mDistanceOfEachAnimation = SCROLL_DISTANCE / mNumberOfAnimations;
	mDelayBetweenAnimations = 0;
	} else {
	mDistanceOfEachAnimation = SCROLL_DISTANCE / mNumberOfAnimations;
	mDelayBetweenAnimations = mScrollInterval / mNumberOfAnimations;
	}
	}

	private void drawText(Canvas canvas, String text, int y, TextPaint paint) {
	int width = (int) paint.measureText(text);
	int x = getMeasuredWidth() - width - TEXT_MARGIN_RIGHT;
	canvas.drawText(text, x, y, paint);
	}

	public int getCurrentSelectedPos() {
	return mCurrentSelectedPos;
	}
	}