MyProgressBarDrawable.java

/*
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

package licola.demo.com.huabandemo.Widget;

import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;

import com.facebook.drawee.drawable.DrawableUtils;

/**
* Drawable that displays a progress bar based on the level.
 * 来自Fresco的 自定义Drawable
*/
public class MyProgressBarDrawable extends Drawable {

  private final Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  private int mBackgroundColor = 0xE91E63ff;
  private int mColor = 0xE91E63ff;
  private int mPadding = 10;
  private int mBarWidth = 20;
  private int mLevel = 0;
  private boolean mHideWhenZero = false;

  /** Sets the progress bar color. */
  public void setColor(int color) {
    if (mColor != color) {
      mColor = color;
      invalidateSelf();
    }
  }

  /** Gets the progress bar color. */
  public int getColor() {
    return mColor;
  }

  /** Sets the progress bar background color. */
  public void setBackgroundColor(int backgroundColor) {
    if (mBackgroundColor != backgroundColor) {
      mBackgroundColor = backgroundColor;
      invalidateSelf();
    }
  }

  /** Gets the progress bar background color. */
  public int getBackgroundColor() {
    return mBackgroundColor;
  }

  /** Sets the progress bar padding. */
  public void setPadding(int padding) {
    if (mPadding != padding) {
      mPadding = padding;
      invalidateSelf();
    }
  }

  /** Gets the progress bar padding. */
  @Override
  public boolean getPadding(Rect padding) {
    padding.set(mPadding, mPadding, mPadding, mPadding);
    return mPadding != 0;
  }

  /** Sets the progress bar width. */
  public void setBarWidth(int barWidth) {
    if (mBarWidth != barWidth) {
      mBarWidth = barWidth;
      invalidateSelf();
    }
  }

  /** Gets the progress bar width. */
  public int getBarWidth() {
    return mBarWidth;
  }

  /** Sets whether the progress bar should be hidden when the progress is 0. */
  public void setHideWhenZero(boolean hideWhenZero) {
    mHideWhenZero = hideWhenZero;
  }

  /** Gets whether the progress bar should be hidden when the progress is 0. */
  public boolean getHideWhenZero() {
    return mHideWhenZero;
  }

  @Override
  protected boolean onLevelChange(int level) {
    mLevel = level;
    invalidateSelf();
    return true;
  }

  @Override
  public void setAlpha(int alpha) {
    mPaint.setAlpha(alpha);
  }

  @Override
  public void setColorFilter(ColorFilter cf) {
    mPaint.setColorFilter(cf);
  }

  @Override
  public int getOpacity() {
    return DrawableUtils.getOpacityFromColor(mPaint.getColor());
  }

  @Override
  public void draw(Canvas canvas) {
    if (mHideWhenZero && mLevel == 0) {
      return;
    }
    drawBar(canvas, 10000, mBackgroundColor);
    drawBar(canvas, mLevel, mColor);
  }

  private void drawBar(Canvas canvas, int level, int color) {
    Rect bounds = getBounds();
    int length = (bounds.width() - 2 * mPadding) * level / 10000;
    int xpos = bounds.left + mPadding;
    int ypos = bounds.bottom - mPadding - mBarWidth;
    mPaint.setColor(color);
    canvas.drawRect(xpos, ypos, xpos + length, ypos + mBarWidth, mPaint);
  }
}