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

import org.mozc.android.inputmethod.japanese.protobuf.ProtoCandidates.CandidateList;
import com.google.common.base.Optional;

/**
 * Layouts the candidates to the view.
 *
 */
public interface CandidateLayouter {

  /**
   * Sets the current view's width and height (i.e. the suggestion size of a page).
   * @return {@code true} if the size change invalidates already layouted candidates.
   * In other words, if this method returns {@code true}, callers have the responsibility
   * to re-layout candidates, by invoking {@link #layout} method.
   */
  public boolean setViewSize(int width, int height);

  /** @return the width of the page. It should be smaller or equal to the view's width. */
  public int getPageWidth();

  /** @return the height of the page. It should be smaller or equal to the view's height. */
  public int getPageHeight();

  /** Layouts the given {@code candidateList}. */
  public Optional<CandidateLayout> layout(CandidateList candidateList);
}
