• 追加された行はこの色です。
  • 削除された行はこの色です。
---
category: swing
folder: ButtonInComboEditor
title: JComboBoxのEditorComponentにJButtonを配置
tags: [JComboBox, LayoutManager, JButton, JLabel, Icon, RGBImageFilter, RescaleOp]
author: aterai
pubdate: 2009-08-17T12:55:55+09:00
description: JComboBoxのEditorComponentにJButtonやJLabelなどを配置します。
image: https://lh6.googleusercontent.com/_9Z4BYR88imo/TQTIT4iCWGI/AAAAAAAAASk/pFFcvRBoyIg/s800/ButtonInComboEditor.png
hreflang:
    href: https://java-swing-tips.blogspot.com/2009/08/jbutton-in-comboeditor.html
    lang: en
---
* 概要 [#j9d62836]
* 概要 [#summary]
`JComboBox`の`EditorComponent`に`JButton`や`JLabel`などを配置します。

#download(https://lh6.googleusercontent.com/_9Z4BYR88imo/TQTIT4iCWGI/AAAAAAAAASk/pFFcvRBoyIg/s800/ButtonInComboEditor.png)

* サンプルコード [#o63272a1]
* サンプルコード [#sourcecode]
#code(link){{
combo02.setLayout(new LayoutManager() {
  @Override public void addLayoutComponent(String name, Component comp) {}
  @Override public void removeLayoutComponent(Component comp) {}
class SiteComboBoxLayout implements LayoutManager {
  private final JLabel favicon;
  private final JButton feedButton;

  protected SiteComboBoxLayout(JLabel favicon, JButton feedButton) {
    this.favicon = favicon;
    this.feedButton = feedButton;
  }

  @Override public void addLayoutComponent(String name, Component comp) {
    /* not needed */
  }

  @Override public void removeLayoutComponent(Component comp) {
    /* not needed */
  }

  @Override public Dimension preferredLayoutSize(Container parent) {
    return parent.getPreferredSize();
  }

  @Override public Dimension minimumLayoutSize(Container parent) {
    return parent.getMinimumSize();
  }

  @Override public void layoutContainer(Container parent) {
    if(!(parent instanceof JComboBox)) return;
    JComboBox cb   = (JComboBox)parent;
    int width    = cb.getWidth();
    int height     = cb.getHeight();
    Insets insets  = cb.getInsets();
    int buttonHeight = height - (insets.top + insets.bottom);
    int buttonWidth  = buttonHeight;
    int labelWidth   = buttonHeight;
    int loupeWidth   = buttonHeight;
    if (!(parent instanceof JComboBox)) {
      return;
    }
    JComboBox<?> cb = (JComboBox<?>) parent;
    int width = cb.getWidth();
    int height = cb.getHeight();
    Insets insets = cb.getInsets();
    int arrowHeight = height - insets.top - insets.bottom;
    int arrowWidth = arrowHeight;
    int faviconWidth = arrowHeight;
    int feedWidth; // = arrowHeight;

    JButton arrowButton = (JButton)cb.getComponent(0);
    if(arrowButton != null) {
    // Arrow Icon JButton
    JButton arrowButton = (JButton) cb.getComponent(0);
    if (Objects.nonNull(arrowButton)) {
      Insets arrowInsets = arrowButton.getInsets();
      buttonWidth = arrowButton.getPreferredSize().width
      arrowWidth = arrowButton.getPreferredSize().width
        + arrowInsets.left + arrowInsets.right;
      arrowButton.setBounds(width - (insets.right + buttonWidth),
                            insets.top, buttonWidth, buttonHeight);
      arrowButton.setBounds(width - insets.right - arrowWidth, insets.top,
                            arrowWidth, arrowHeight);
    }
    if(label != null) {
      Insets labelInsets = label.getInsets();
      labelWidth = label.getPreferredSize().width
        + labelInsets.left + labelInsets.right;
      label.setBounds(insets.left, insets.top, labelWidth, buttonHeight);

    // Favicon JLabel
    if (Objects.nonNull(favicon)) {
      Insets faviconInsets = favicon.getInsets();
      faviconWidth = favicon.getPreferredSize().width
          + faviconInsets.left + faviconInsets.right;
      favicon.setBounds(insets.left, insets.top, faviconWidth, arrowHeight);
    }
    JButton rssButton = button;
    if(rssButton != null && rssButton.isVisible()) {
      Insets loupeInsets = rssButton.getInsets();
      loupeWidth = rssButton.getPreferredSize().width
        + loupeInsets.left + loupeInsets.right;
      rssButton.setBounds(width - (insets.right + loupeWidth + buttonWidth),
                          insets.top, loupeWidth, buttonHeight);
    }else{
      loupeWidth = 0;

    // Feed Icon JButton
    if (Objects.nonNull(feedButton) && feedButton.isVisible()) {
      Insets feedInsets = feedButton.getInsets();
      feedWidth = feedButton.getPreferredSize().width
          + feedInsets.left + feedInsets.right;
      feedButton.setBounds(width - insets.right - feedWidth - arrowWidth, insets.top,
                           feedWidth, arrowHeight);
    } else {
      feedWidth = 0;
    }

    // JComboBox Editor
    Component editor = cb.getEditor().getEditorComponent();
    if ( editor != null ) {
      editor.setBounds(insets.left + labelWidth, insets.top,
        width -(insets.left+insets.right+buttonWidth+labelWidth+loupeWidth),
        height-(insets.top +insets.bottom));
    if (Objects.nonNull(editor)) {
      editor.setBounds(insets.left + faviconWidth, insets.top,
          width  - insets.left - insets.right - arrowWidth - faviconWidth - feedWidth,
          height - insets.top  - insets.bottom);
    }
  }
});
}
}}

* 解説 [#g2c763e2]
上記のサンプルでは、`JComboBox`に独自のレイアウトマネージャーを設定して、`JButton`や`JLabel`を配置しています。
* 解説 [#explanation]
上記のサンプルでは、`JComboBox`に独自のレイアウトマネージャーを設定して、そのエディタ内部にデフォルトの`ArrowButton`とは異なる`JButton`や`JLabel`を追加で配置しています。

- `JButton`に`Feed`アイコンを設定して`ArrowButton`の左側に追加配置
-- `EditorComponent`にフォーカスがある場合この`FeedButton`は非表示
- `JLabel`に`Favicon`を設定して左端に追加配置

----
`RolloverIcon`は、元のアイコンに以下のようなフィルタを掛けて作成しています。
- `RolloverIcon`は元のアイコンに以下のようなフィルタを掛けて作成している

- `RGBImageFilter`を使用

#code{{
// RGBImageFilter を使用
private static ImageIcon makeFilteredImage(ImageIcon srcIcon) {
  RGBImageFilter filter = new SelectedImageFilter();
  FilteredImageSource fis = new FilteredImageSource(srcIcon.getImage().getSource(), filter);
  FilteredImageSource fis = new FilteredImageSource(
      srcIcon.getImage().getSource(), filter);
  return new ImageIcon(Toolkit.getDefaultToolkit().createImage(fis));
}
static class SelectedImageFilter extends RGBImageFilter {
  public SelectedImageFilter() {
    canFilterIndexColorModel = false;

class SelectedImageFilter extends RGBImageFilter {
  private static final float SCALE = 1.2f;
  @Override public int filterRGB(int x, int y, int argb) {
    // int a = (argb >> 24) & 0xFF;
    int r = (int) Math.min(0xFF, ((argb >> 16) & 0xFF) * SCALE);
    int g = (int) Math.min(0xFF, ((argb >>  8) & 0xFF) * SCALE);
    int b = (int) Math.min(0xFF, ((argb)       & 0xFF) * SCALE);
    return (argb & 0xFF_00_00_00) | (r << 16) | (g << 8) | (b);
  }
  private final float scale = 1.2f;
  public int filterRGB(int x, int y, int argb) {
    //int a = (argb >> 24) & 0xff;
    int r = (argb >> 16) & 0xff;
    int g = (argb >> 8)  & 0xff;
    int b = (argb)       & 0xff;
    r = (int)(r*scale);
    g = (int)(g*scale);
    b = (int)(b*scale);
    if(r > 255) r = 255;
    if(g > 255) g = 255;
    if(b > 255) b = 255;
    return (argb & 0xff000000) | (r<<16) | (g<<8) | (b);
  }
}
}}

- `RescaleOp`を使用

#code{{
// RescaleOp を使用
private static ImageIcon makeFilteredImage2(ImageIcon srcIcon) {
  RescaleOp op = new RescaleOp(
      new float[] { 1.2f,1.2f,1.2f,1.0f },
      new float[] { 0f,0f,0f,0f }, null);
      new float[] { 1.2f, 1.2f, 1.2f, 1f },
      new float[] { 0f, 0f, 0f, 0f }, null);
  BufferedImage img = new BufferedImage(
      srcIcon.getIconWidth(), srcIcon.getIconHeight(), BufferedImage.TYPE_INT_ARGB);
  Graphics g = img.getGraphics();
  //g.drawImage(srcIcon.getImage(), 0, 0, null);
  srcIcon.paintIcon(null, g, 0, 0);
  g.dispose();
  return new ImageIcon(op.filter(img, null));
}
}}

* 参考リンク [#eb8b8cf3]
* 参考リンク [#reference]
- [http://feedicons.com/ Feed Icons - Home of the Standard Web Feed Icon]
- [[JComboBoxにアイコンを表示>Swing/IconComboBox]]
- [[JTextField内にアイコンを追加>Swing/IconTextField]]

* コメント [#i9c7403d]
* コメント [#comment]
#comment
- `EditorComponent`に追加した`JButton`をクリックすると例外が発生する場合があるバグを修正 -- &user(aterai); &new{2009-08-28 (金) 16:42:47};

#comment