Android Open Source - FPlayAndroid Bg Seek Bar

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The source code is released under:
Copyright (c) 2013-2014, Carlos Rafael Gimenes das Neves All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the followin...
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Java Source Code

//
// FPlayAndroid is distributed under the FreeBSD License
///* w w w.j  a v a 2s .  c  o m*/
// Copyright (c) 2013-2014, Carlos Rafael Gimenes das Neves
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// The views and conclusions contained in the software and documentation are those
// of the authors and should not be interpreted as representing official policies,
// either expressed or implied, of the FreeBSD Project.
//
// https://github.com/carlosrafaelgn/FPlayAndroid
//
package br.com.carlosrafaelgn.fplay.ui;

import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.SoundEffectConstants;
import android.view.View;
import android.view.ViewDebug.ExportedProperty;
import android.view.accessibility.AccessibilityEvent;

import br.com.carlosrafaelgn.fplay.ui.drawable.TextIconDrawable;

public final class BgSeekBar extends View {
  public static interface OnBgSeekBarChangeListener {
    public void onValueChanged(BgSeekBar seekBar, int value, boolean fromUser, boolean usingKeys);
    public boolean onStartTrackingTouch(BgSeekBar seekBar);
    public void onStopTrackingTouch(BgSeekBar seekBar, boolean cancelled);
  }
  
  public static interface OnBgSeekBarDrawListener {
    public void onSizeChanged(BgSeekBar seekBar, int width, int height);
    public void onDraw(Canvas canvas, BgSeekBar seekBar, Rect rect, int filledSize);
  }
  
  private String additionalContentDescription, text;
  private int width, height, filledSize, value, max, textWidth, textX, textY, textColor, textBgY, textSize, textSizeIdx, keyIncrement;
  private boolean insideList, vertical, tracking, drawTextFirst, sliderMode;
  private int state, thumbWidth, size;
  private OnBgSeekBarChangeListener listener;
  private OnBgSeekBarDrawListener drawListener;
  
  public BgSeekBar(Context context) {
    super(context);
    init();
  }
  
  public BgSeekBar(Context context, AttributeSet attrs) {
    super(context, attrs);
    init();
  }
  
  public BgSeekBar(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    init();
  }
  
  private void init() {
    state = UI.STATE_SELECTED;
    text = "";
    max = 100;
    sliderMode = false;
    thumbWidth = (UI._IconBox * 90) / 100;
    setTextSizeIndex(2);
    super.setDrawingCacheEnabled(false);
    super.setClickable(true);
    super.setFocusableInTouchMode(false);
    super.setFocusable(true);
  }
  
  public void setSliderMode(boolean sliderMode) {
    this.sliderMode = sliderMode;
    this.thumbWidth = (sliderMode ? (UI.strokeSize << 1) : ((UI._IconBox * 90) / 100));
    setTextSizeIndex(textSizeIdx);
    updateBar();
    invalidate();
  }
  
  public void setInsideList(boolean insideList) {
    this.insideList = insideList;
    updateTextX();
    invalidate();
  }
  
  public OnBgSeekBarChangeListener getOnBgSeekBarChangeListener() {
    return listener;
  }
  
  public void setOnBgSeekBarChangeListener(OnBgSeekBarChangeListener listener) {
    this.listener = listener;
  }
  
  public OnBgSeekBarDrawListener getOnBgSeekBarDrawListener() {
    return drawListener;
  }
  
  public void setOnBgSeekBarDrawListener(OnBgSeekBarDrawListener listener) {
    this.drawListener = listener;
  }
  
  public int getKeyIncrement() {
    return keyIncrement;
  }
  
  public void setKeyIncrement(int keyIncrement) {
    this.keyIncrement = keyIncrement;
  }
  
  public int getTextSizeIndex() {
    return textSizeIdx;
  }
  
  public void setTextSizeIndex(int index) {
    size = UI.defaultControlSize;
    switch (index) {
    case 2:
      textSizeIdx = 2;
      textSize = UI._22sp;
      textBgY = (UI.defaultControlSize >> 1) - (UI._22spBox >> 1);
      textY = textBgY + UI._22spYinBox;
      break;
    case 1:
      textSizeIdx = 1;
      textSize = UI._18sp;
      textBgY = (UI.defaultControlSize >> 1) - (UI._18spBox >> 1);
      textY = textBgY + UI._18spYinBox;
      break;
    default:
      textSizeIdx = 0;
      textSize = UI._14sp;
      textBgY = (UI.defaultControlSize >> 1) - (UI._14spBox >> 1);
      textY = textBgY + UI._14spYinBox;
      break;
    }
    updateTextWidth();
  }
  
  public void setSize(int size, int textSize, int bgY, int y) {
    this.size = size;
    this.textSizeIdx = -1;
    this.textSize = textSize;
    this.textBgY = bgY;
    this.textY = y;
    updateTextWidth();
  }

  @Override
  public CharSequence getContentDescription() {
    String d = "";
    if (additionalContentDescription != null)
      d = additionalContentDescription;
    if (text != null) {
      if (d.length() > 0)
        d += ": ";
      d += text;
    }
    return d;
  }

  public void setAdditionalContentDescription(String additionalContentDescription) {
    this.additionalContentDescription = additionalContentDescription;
  }
  
  public String getText() {
    return text;
  }
  
  public void setText(String text) {
    this.text = text;
    updateTextWidth();
  }
  
  public void setText(int resId) {
    this.text = getContext().getText(resId).toString();
    updateTextWidth();
  }
  
  private void updateTextX() {
    final int s = (vertical ? height : width);
    if (filledSize < textWidth && filledSize < ((s >> 1) - (thumbWidth >> 1))) {
      drawTextFirst = false;
      textColor = (insideList ? UI.color_text_listitem : UI.color_text);
      textX = s - textWidth;
      if (textX < filledSize + thumbWidth)
        textX = filledSize + thumbWidth;
    } else {
      drawTextFirst = true;
      textColor = UI.color_text_selected;
      textX = UI._4dp;
    }
  }
  
  private void updateTextWidth() {
    textWidth = UI._4dp + ((text == null || text.length() == 0) ? 0 : UI.measureText(text, textSize));
    updateTextX();
    invalidate();
  }
  
  public boolean isTracking() {
    return tracking;
  }
  
  public boolean isVertical() {
    return this.vertical;
  }
  
  public void setVertical(boolean vertical) {
    this.vertical = vertical;
    updateBar();
  }
  
  public int getMax() {
    return max;
  }
  
  public void setMax(int max) {
    if (max < 1)
      max = 1;
    if (this.max != max) {
      this.max = max;
      if (value > max) {
        value = max;
        if (listener != null)
          listener.onValueChanged(this, value, false, false);
      }
      updateBar();
    }
  }
  
  public int getValue() {
    return value;
  }
  
  public void setValue(int value) {
    setValue(value, false, false);
  }

  @Override
  public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
    if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED)
      event.setEventType(32768); //AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED = 32768
    return super.dispatchPopulateAccessibilityEvent(event);
  }

  private void setValue(int value, boolean fromUser, boolean usingKeys) {
    if (value < 0)
      value = 0;
    else if (value > max)
      value = max;
    if (this.value != value) {
      this.value = value;
      if (listener != null)
        listener.onValueChanged(this, value, fromUser, usingKeys);
      updateBar();
      if (fromUser && Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN)
        sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED);
    }
  }
  
  private void updateBar() {
    final int total = (vertical ? height : width) - thumbWidth;
    //filledSize = ((total > 0) ? (int)((float)(total * value) / (float)max) : 0);
    filledSize = ((total > 0) ? (int)((float)(total * value) / (float)max) : 0);
    updateTextX();
    invalidate();
  }
  
  @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
  @Override
  public void setBackground(Drawable background) {
    super.setBackground(null);
  }
  
  @Override
  @Deprecated
  public void setBackgroundDrawable(Drawable background) {
    super.setBackgroundDrawable(null);
  }
  
  @Override
  public void setBackgroundResource(int resid) {
    super.setBackgroundResource(0);
  }
  
  @Override
  public void setBackgroundColor(int color) {
    super.setBackgroundResource(0);
  }
  
  @Override
  public Drawable getBackground() {
    return null;
  }
  
  @Override
  @ExportedProperty(category = "drawing")
  public boolean isOpaque() {
    return false;
  }
  
  @Override
  protected void drawableStateChanged() {
    super.drawableStateChanged();
    state = UI.handleStateChanges(state, isPressed(), isFocused(), this);
  }
  
  @Override
  public int getPaddingLeft() {
    return 0;
  }
  
  @Override
  public int getPaddingTop() {
    return 0;
  }
  
  @Override
  public int getPaddingRight() {
    return 0;
  }
  
  @Override
  public int getPaddingBottom() {
    return 0;
  }
  
  @Override
  public void setPadding(int left, int top, int right, int bottom) {
  }
  
  @Override
  protected int getSuggestedMinimumWidth() {
    return size;
  }
  
  @Override
  public int getMinimumWidth() {
    return size;
  }
  
  @Override
  protected int getSuggestedMinimumHeight() {
    return size;
  }
  
  @Override
  public int getMinimumHeight() {
    return size;
  }
  
  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
     setMeasuredDimension(resolveSize(size, widthMeasureSpec), resolveSize(size, heightMeasureSpec));
  }
  
  @Override
  protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);
    width = w;
    height = h;
    updateBar();
    if (drawListener != null)
      drawListener.onSizeChanged(this, w, h);
  }
  
  private void trackTouchEvent(float position) {
    final float total = (vertical ? height : width) - thumbWidth;
    if (total <= 0)
      return;
    if (vertical)
      position = (float)(height - (thumbWidth >> 1)) - position;
    else
      position -= (float)(thumbWidth >> 1);
    setValue((int)(((float)max * position) / total), true, false);
  }

  @Override
  public boolean onTouchEvent(MotionEvent event) {
    if (!isEnabled())
      return false;
    
    //Based on: http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/2.3.3_r1/android/widget/AbsSeekBar.java#AbsSeekBar.onTouchEvent%28android.view.MotionEvent%29
    switch (event.getAction()) {
    case MotionEvent.ACTION_DOWN:
      tracking = false;
      if (listener != null) {
        if (!listener.onStartTrackingTouch(this))
          return true;
      }
      tracking = true;
      setPressed(true);
      trackTouchEvent(vertical ? event.getY() : event.getX());
      if (getParent() != null)
        getParent().requestDisallowInterceptTouchEvent(true);
      playSoundEffect(SoundEffectConstants.CLICK);
      break;
    case MotionEvent.ACTION_MOVE:
      if (!tracking)
        return true;
      trackTouchEvent(vertical ? event.getY() : event.getX());
      break;
    case MotionEvent.ACTION_UP:
      setPressed(false);
      if (tracking) {
        trackTouchEvent(vertical ? event.getY() : event.getX());
        if (listener != null)
          listener.onStopTrackingTouch(this, false);
        tracking = false;
      }
      break;
    case MotionEvent.ACTION_CANCEL:
      setPressed(false);
      invalidate();
      if (tracking) {
        if (listener != null)
          listener.onStopTrackingTouch(this, true);
        tracking = false;
      }
      break;
    }
    return true;
  }
  
  @Override
  public boolean onKeyDown(int keyCode, KeyEvent event) {
    //Base on: http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/2.3.3_r1/android/widget/AbsSeekBar.java#AbsSeekBar.onKeyDown%28int%2Candroid.view.KeyEvent%29
    if (isEnabled()) {
      int value = getValue();
      switch (keyCode) {
      case KeyEvent.KEYCODE_DPAD_LEFT:
        if (vertical || keyIncrement <= 0)
          break;
        if (value > 0) {
          if (value >= keyIncrement)
            value -= keyIncrement;
          else
            value = 0;
          setValue(value, true, true);
        }
        return true;
      case KeyEvent.KEYCODE_DPAD_DOWN:
        if (!vertical || keyIncrement <= 0)
          break;
        if (value > 0) {
          if (value >= keyIncrement)
            value -= keyIncrement;
          else
            value = 0;
          setValue(value, true, true);
        }
        return true;
      case KeyEvent.KEYCODE_DPAD_RIGHT:
        if (vertical || keyIncrement <= 0)
          break;
        if (value < max) {
          if ((value + keyIncrement) <= max)
            value += keyIncrement;
          else
            value = max;
          setValue(value, true, true);
        }
        return true;
      case KeyEvent.KEYCODE_DPAD_UP:
        if (!vertical || keyIncrement <= 0)
          break;
        if (value < max) {
          if ((value + keyIncrement) <= max)
            value += keyIncrement;
          else
            value = max;
          setValue(value, true, true);
        }
        return true;
      }
    }
    return super.onKeyDown(keyCode, event);
  }
  
  @Override
  protected void onDraw(Canvas canvas) {
    getDrawingRect(UI.rect);
    if (vertical) {
      canvas.save();
      canvas.translate(0, height);
      canvas.rotate(-90);
      final int tmp = UI.rect.right;
      UI.rect.right = UI.rect.bottom;
      UI.rect.bottom = tmp;
    }
    if (drawListener != null) {
      drawListener.onDraw(canvas, this, UI.rect, filledSize);
    } else {
      final int right = UI.rect.right;
      final int bottom = UI.rect.bottom;
      final int color = UI.getBorderColor(state);
      UI.rect.top = UI._8dp;
      UI.rect.bottom -= UI._8dp;
      UI.strokeRect(canvas, color, UI.strokeSize);
      UI.rect.left = UI.strokeSize;
      UI.rect.top += UI.strokeSize;
      UI.rect.bottom -= UI.strokeSize;
      UI.rect.right = UI.strokeSize + filledSize;
      UI.drawBgBorderless(canvas, state, false);
      if (drawTextFirst)
        UI.drawText(canvas, text, textColor, textSize, textX, textY);
      UI.rect.left = UI.rect.right;
      UI.rect.right = right - UI.strokeSize;
      if (!drawTextFirst)
        UI.drawText(canvas, text, textColor, textSize, textX, textY);
      if (sliderMode) {
        TextIconDrawable.drawIcon(canvas, UI.ICON_SLIDERTOP, filledSize + (thumbWidth >> 1) - UI._8dp, 0, UI._16dp, color);
        TextIconDrawable.drawIcon(canvas, UI.ICON_SLIDERBOTTOM, filledSize + (thumbWidth >> 1) - UI._8dp, bottom - UI._8dp, UI._16dp, color);
      } else {
        UI.rect.left = filledSize;
        UI.rect.top = 0;
        UI.rect.right = filledSize + thumbWidth;
        UI.rect.bottom = bottom;
        UI.fillRect(canvas, color);
        UI.rect.left += UI.strokeSize;
        UI.rect.top += UI.strokeSize;
        UI.rect.right -= UI.strokeSize;
        UI.rect.bottom -= UI.strokeSize;
        UI.drawBgBorderless(canvas, state, false);
        TextIconDrawable.drawIcon(canvas, UI.ICON_GRIP, filledSize + (thumbWidth >> 1) - (UI._22sp >> 1), (bottom >> 1) - (UI._22sp >> 1), UI._22sp, color);
      }
    }
    if (vertical)
      canvas.restore();
  }

  @Override
  protected void onDetachedFromWindow() {
    additionalContentDescription = null;
    text = null;
    listener = null;
    drawListener = null;
    super.onDetachedFromWindow();
  }
}
Java Source Code List
