Swing/ElementAttribute の変更点

---
category: swing
folder: ElementAttribute
title: JEditorPaneのHTMLタグにToolTipTextを設定する
tags: [JEditorPane, JTextPane, HTMLDocument, JToolTip, HyperlinkListener]
author: aterai
pubdate: 2011-08-08T15:04:19+09:00
description: JEditorPaneでdivやspanタグのtitle属性をToolTipで表示できるように設定します。
image: https://lh4.googleusercontent.com/-3HQ42PjgBfs/Tj97O_2VS6I/AAAAAAAABAc/EnrOPXrJxfE/s800/ElementAttribute.png
---
* Summary [#summary]
`JEditorPane`で`div`や`span`タグの`title`属性を`ToolTip`で表示できるように設定します。

#download(https://lh4.googleusercontent.com/-3HQ42PjgBfs/Tj97O_2VS6I/AAAAAAAABAc/EnrOPXrJxfE/s800/ElementAttribute.png)

* Source Code Examples [#sourcecode]
#code(link){{
JTextPane editor1 = new JTextPane() {
  private transient Position.Bias[] bias = new Position.Bias[1];
  @Override public String getToolTipText(MouseEvent e) {
    String title = super.getToolTipText(e);
    JEditorPane editor = (JEditorPane) e.getSource();
    if (!editor.isEditable()) {
      Point pt = new Point(e.getX(), e.getY());
      int pos = editor.getUI().viewToModel(editor, pt, bias);
      if (bias[0] == Position.Bias.Backward && pos > 0) {
        pos--;
      }
      if (pos >= 0 &&(editor.getDocument() instanceof HTMLDocument)) {
        HTMLDocument hdoc = (HTMLDocument) editor.getDocument();
        Element elem = hdoc.getCharacterElement(pos);
        if (elem != null) {
          AttributeSet a = elem.getAttributes();
          AttributeSet span = (AttributeSet) a.getAttribute(HTML.Tag.SPAN);
          if (span != null) {
            title = (String) span.getAttribute(HTML.Attribute.TITLE);
          }
        }
      }
    }
    return title;
  }
};
editor1.setEditorKit(new HTMLEditorKit());
}}

* Description [#explanation]
* Description [#description]
上記のサンプルでは、`JEditorPane`で`HTMLEditorKit`を使った場合の`ToolTip`表示についてテストしています。`img`タグの`alt`属性は自動的に`ToolTip`表示され、リンクは`HyperlinkListener`を追加することで`ToolTip`を変更できます。

#code{{
private final String htmlText =
  "<html><body>" +
  "<span style='background:#88ff88;' title='tooltip: span[@title]'>span</span><br />" +
  "<div title='tooltip: div[@title]'>div tag: div div div div</div>" +
  "<div style='padding: 2 24;'><img src='"+ image +"' alt='16x16 favicon' />&nbsp;" +
  "<a href='https://ateraimemo.com/'>Java Swing Tips</a></div>" +
  "</body></html>";
}}

- 上: `span`タグの`title`属性を`ToolTip`で表示
-- `HTMLEditorKit`の`LinkController`クラスを参考に`JEditorPane#getToolTipText(MouseEvent)`メソッドをオーバーライド
- 下: `div`タグの`title`属性を`ToolTip`で表示
-- `ImageView#getToolTipText(...)`を参考
-- `HyperlinkListener`を追加
#code{{
class TooltipEditorKit extends HTMLEditorKit {
  @Override public ViewFactory getViewFactory() {
    return new HTMLFactory() {
      @Override public View create(Element elem) {
        AttributeSet attrs = elem.getAttributes();
        Object elementName = attrs.getAttribute(
            AbstractDocument.ElementNameAttribute);
        Object o = (elementName != null)
          ? null : attrs.getAttribute(StyleConstants.NameAttribute);
        if (o instanceof HTML.Tag) {
          HTML.Tag kind = (HTML.Tag) o;
          if (kind == HTML.Tag.DIV) {
            return new BlockView(elem, View.Y_AXIS) {
              @Override public String getToolTipText(
                  float x, float y, Shape allocation) {
                String s = super.getToolTipText(x, y, allocation);
                if (s == null) {
                  s = (String) getElement().getAttributes().getAttribute(
                      HTML.Attribute.TITLE);
                }
                return s;
              }
            };
          }
        }
        return super.create(elem);
      }
    };
  }
}
}}

* Reference [#reference]
- [[JEditorPaneにリンクを追加>Swing/HyperlinkListener]]
- [https://bugs.openjdk.org/browse/JDK-8218674 &#91;JDK-8218674&#93; HTML Tooltip with "img src=" on component doesn't show - Java Bug System]

* Comment [#comment]
#comment
#comment