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

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

import com.google.common.base.Preconditions;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.ImageView;

/**
 * A ImageView which accepts mozc drawable as src.
 * <p>
 * In addition to ImageView, following XML attributes are supported:
 * <ul>
 * <li>maxImageWidth(dimension): If set, additional padding (left and right) are automatically
 * set in order to make drawn image thinner than given width.
 * {@code setPadding} and {@code setPaddingRelative} are disabled
 *  (UnsupportedOperationException will be thrown}.
 * <li>maxImageHeight(dimension): Same as maxImageWidth.
 * </ul>
 * <p>
 * This class is not intended to be changed its padding.
 * There was a warning code for it but on old Android framework setPadding() is always called
 * so the warning code has been removed.
 */
public class MozcImageView extends ImageView implements MozcImageCapableView {

  private final MozcImageCapableViewDelegate delegate = new MozcImageCapableViewDelegate(this);

  public MozcImageView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    Preconditions.checkArgument(
        MozcImageCapableViewDelegate.assertSrcAttribute(getResources(), attrs));
    delegate.loadMozcImageSource(attrs);
  }

  public MozcImageView(Context context, AttributeSet attrs) {
    super(context, attrs);
    Preconditions.checkArgument(
        MozcImageCapableViewDelegate.assertSrcAttribute(getResources(), attrs));
    delegate.loadMozcImageSource(attrs);
  }

  public MozcImageView(Context context) {
    super(context);
  }

  public void setRawId(int rawId) {
    delegate.setRawId(rawId);
  }

  public void setSkin(Skin skin) {
    delegate.setSkin(skin);
  }

  @Override
  protected void onSizeChanged(int width, int height, int oldWidth, int oldHeight) {
    super.onSizeChanged(width, height, oldWidth, oldHeight);
    delegate.updateAdditionalPadding();
  }

  @Override
  public void setMaxImageWidth(int maxImageWidth) {
    delegate.setMaxImageWidth(maxImageWidth);
  }

  @Override
  public void setMaxImageHeight(int maxImageHeight) {
    delegate.setMaxImageHeight(maxImageHeight);
  }

  @Override
  public ImageView asImageView() {
    return this;
  }
}