src/android/src/com/google/android/inputmethod/japanese/ui/SpanFactory.java

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

import org.mozc.android.inputmethod.japanese.protobuf.ProtoCandidates.CandidateWord;
import org.mozc.android.inputmethod.japanese.ui.CandidateLayout.Span;
import org.mozc.android.inputmethod.japanese.util.CandidateDescriptionUtil;
import com.google.common.base.Optional;
import com.google.common.base.Preconditions;
import com.google.common.base.Strings;

import android.graphics.Paint;

import java.util.List;

/**
 * Factory to create Span instances based on given CandidateWord instances.
 */
public class SpanFactory {

  /** Paint to measure value width in pixels */
  private final Paint valuePaint = new Paint();

  /** Paint to measure description width in pixels. */
  private final Paint descriptionPaint = new Paint();

  /** Delimiter characters for descriptions. */
  private Optional<String> descriptionDelimiter = Optional.absent();

  public void setValueTextSize(float valueTextSize) {
    valuePaint.setTextSize(valueTextSize);
  }

  public void setDescriptionTextSize(float descriptionTextSize) {
    descriptionPaint.setTextSize(descriptionTextSize);
  }

  public void setDescriptionDelimiter(String descriptionDelimiter) {
    this.descriptionDelimiter = Optional.of(descriptionDelimiter);
  }

  public Span newInstance(CandidateWord candidateWord) {
    Preconditions.checkNotNull(candidateWord);

    float valueWidth = valuePaint.measureText(candidateWord.getValue());
    String description = candidateWord.getAnnotation().getDescription();
    List<String> splitDescriptionList = CandidateDescriptionUtil.extractDescriptions(
        Strings.nullToEmpty(description), descriptionDelimiter);
    float descriptionWidth = 0;
    for (String line : splitDescriptionList) {
      float width = descriptionPaint.measureText(line);
      if (width > descriptionWidth) {
        descriptionWidth = width;
      }
    }
    return new Span(Optional.of(candidateWord), valueWidth, descriptionWidth,
                    splitDescriptionList);
  }
}