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

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

import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;

/**
 * Selected tab highlight implementation.
 *
 */
public class TabSelectedBackgroundDrawable extends BaseBackgroundDrawable {
  private final int highlightHeight;
  private final Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);

  public TabSelectedBackgroundDrawable(int highlightHeight, int highlightColor) {
    // No padding.
    super(0, 0, 0, 0);
    this.highlightHeight = highlightHeight;
    paint.setColor(highlightColor);
  }

  @Override
  public void draw(Canvas canvas) {
    if (isCanvasRectEmpty()) {
      return;
    }

    // Paint the rectangle.
    Rect bounds = getBounds();
    canvas.drawRect(0, bounds.bottom - highlightHeight, bounds.right, bounds.bottom, paint);
  }
}