Android Open Source - holoaccent Scrubber Progress Drawable

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License

The source code is released under:

Apache License

Java Source Code

/*******************************************************************************
 * Copyright 2013 NEGU Soft//  w  w  w  .j a v a 2  s.  c  om
 * 
 * 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.negusoft.holoaccent.drawable;

import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.util.DisplayMetrics;
import android.util.TypedValue;

import com.negusoft.holoaccent.AccentPalette;

/**
 * Simple solid drawable that changes will fill the container based on the current level.
 */
public class ScrubberProgressDrawable extends Drawable {
  
  private static final float LINE_WIDTH_DP = 4f;
  
  private final ScrubberProgressConstantState mState;
  private final Paint mPaint;
  
  public ScrubberProgressDrawable(DisplayMetrics metrics, AccentPalette palette) {
    this(metrics, palette, 255);
  }
  
  public ScrubberProgressDrawable(DisplayMetrics metrics, AccentPalette palette, int alpha) {
    mState = new ScrubberProgressConstantState(metrics, palette, alpha);
    mPaint = initPaint(metrics, palette, alpha);
  }
  
  private Paint initPaint(DisplayMetrics metrics, AccentPalette palette, int alpha) {
    float width = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, LINE_WIDTH_DP, metrics);
    Paint result = new Paint();
    result.setStyle(Paint.Style.STROKE);
    result.setColor(palette.getAccentColor(alpha));
    result.setStrokeWidth(width);
    return result;
  }

  @Override
  public void draw(Canvas canvas) {
    float level = getLevel() / 10000f;
    Rect bounds = getBounds();
    float centerY = bounds.exactCenterY();
    float startX = bounds.left;
    float stopX = startX + (bounds.width() * level);

    canvas.drawLine(bounds.left, centerY, stopX, centerY, mPaint);
  }
  
  @Override
  public int getIntrinsicHeight() {
        int result = (int)mPaint.getStrokeWidth();
        return (result < 1) ? 1 : result;
  }

  @Override
  public int getOpacity() {
    return PixelFormat.TRANSLUCENT;
  }

  @Override
  public void setAlpha(int alpha) {
    float alphaPrecentage = alpha / 255f;
    float resultAlpha = mState.mBaseAlpha * alphaPrecentage;
    int color = mState.mPalette.getAccentColor((int)resultAlpha);
    mPaint.setColor(color);
  }

  @Override
  public void setColorFilter(ColorFilter cf) {
    // empty
  }

  @Override
  public final ConstantState getConstantState() {
    mState.changingConfigurationValue = super.getChangingConfigurations();
    return mState;
  }
  
  public static class ScrubberProgressConstantState extends ConstantState {

    public final DisplayMetrics mDisplayMetrics;
    public final AccentPalette mPalette;
    public final int mBaseAlpha;
    
    int changingConfigurationValue;
    
    public ScrubberProgressConstantState(DisplayMetrics metrics, AccentPalette palette, int baseAlpha) {
      mDisplayMetrics = metrics;
      mPalette = palette;
      mBaseAlpha = baseAlpha;
    }

    @Override
    public int getChangingConfigurations() {
      return changingConfigurationValue;
    }

    @Override
    public Drawable newDrawable() {
      return new ScrubberProgressDrawable(mDisplayMetrics, mPalette, mBaseAlpha);
    }
    
  }

}

Java Source Code List

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