src/android/src/com/google/android/inputmethod/japanese/keyboard/Keyboard.java

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

import com.google.common.base.Optional;
import com.google.common.base.Preconditions;

import java.util.Collections;
import java.util.List;

/**
 * A simple model class of a keyboard.
 * A keyboard can contain a sequence of {@code Row}s.
 *
 */
public class Keyboard {

  private final Optional<String> contentDescription;
  private final float flickThreshold;
  private final List<Row> rowList;

  public final int contentLeft;
  public final int contentRight;
  public final int contentTop;
  public final int contentBottom;

  public Keyboard(Optional<String> contentDescription,
                  List<? extends Row> rowList, float flickThreshold) {
    this.contentDescription = Preconditions.checkNotNull(contentDescription);
    this.flickThreshold = flickThreshold;
    this.rowList = Collections.unmodifiableList(rowList);

    int left = Integer.MAX_VALUE, right = Integer.MIN_VALUE,
        top = Integer.MAX_VALUE, bottom = Integer.MIN_VALUE;
    for (Row row : this.rowList) {
      for (Key key : row.getKeyList()) {
        left = Math.min(left, key.getX());
        right = Math.max(right, key.getX() + key.getWidth());
        top = Math.min(top, key.getY());
        bottom = Math.max(bottom, key.getY() + key.getHeight());
      }
    }
    this.contentLeft = left;
    this.contentRight = right;
    this.contentTop = top;
    this.contentBottom = bottom;
  }

  public Optional<String> getContentDescription() {
    return contentDescription;
  }

  public float getFlickThreshold() {
    return flickThreshold;
  }

  public List<Row> getRowList() {
    return rowList;
  }
}