src/android/src/com/google/android/inputmethod/japanese/view/ThreeDotsIconDrawable.java

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package org.mozc.android.inputmethod.japanese.view;

import android.graphics.BlurMaskFilter;
import android.graphics.BlurMaskFilter.Blur;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.Drawable;

/**
 * Three-dots overlay icon for keys which accept long-press. e.g., space.
 */
public class ThreeDotsIconDrawable extends Drawable {

  private final float bottomOffset;
  private final float rightOffset;

  private final float width;
  private final float span;

  private static final int DOT_NUMBER = 3;
  private static final float BLUR_RADIUS = 0.5f;

  private final RectF[] dotRects = new RectF[DOT_NUMBER];

  private final Paint basePaint = new Paint(Paint.ANTI_ALIAS_FLAG);

  public ThreeDotsIconDrawable(float bottomOffset, float rightOffset,
                               int color, float width, float span) {
    this.bottomOffset = bottomOffset;
    this.rightOffset = rightOffset;
    this.width = width;
    this.span = span;

    basePaint.setColor(color);
    basePaint.setStyle(Style.FILL);
    basePaint.setMaskFilter(new BlurMaskFilter(BLUR_RADIUS, Blur.NORMAL));

    for (int i = 0; i < DOT_NUMBER; ++i) {
      dotRects[i] = new RectF();
    }
  }

  @Override
  public void draw(Canvas canvas) {
    for (RectF rect : dotRects) {
      canvas.drawRect(rect, basePaint);
    }
  }

  @Override
  protected void onBoundsChange(Rect bound) {
    super.onBoundsChange(bound);

    for (int i = 0; i < dotRects.length; ++i) {
      float right = bound.right - (width + span) * i - rightOffset;
      float bottom = bound.bottom - bottomOffset;
      dotRects[i].set(right - width, bottom - width, right, bottom);
    }
  }

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

  @Override
  public void setAlpha(int alpha) {
  }

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