Swing/ButtonInTableHeader の変更点

---
category: swing
folder: ButtonInTableHeader
title: JTableHeaderにJButtonを追加する
tags: [JTable, JTableHeader, JButton, JPopupMenu, MouseListener]
author: aterai
pubdate: 2011-11-07T22:14:09+09:00
description: JTableHeaderにクリックするとポップアップメニューを表示するJButtonを追加します。
image: https://lh3.googleusercontent.com/-ccZ08VSXYwE/Trd27UaeD2I/AAAAAAAABEk/1NAYoZ1NGV0/s800/ButtonInTableHeader.png
hreflang:
    href: https://java-swing-tips.blogspot.com/2011/12/dropdown-menu-button-in-jtableheader.html
    lang: en
---
* Summary [#summary]
`JTableHeader`にクリックするとポップアップメニューを表示する`JButton`を追加します。

#download(https://lh3.googleusercontent.com/-ccZ08VSXYwE/Trd27UaeD2I/AAAAAAAABEk/1NAYoZ1NGV0/s800/ButtonInTableHeader.png)

* Source Code Examples [#sourcecode]
#code(link){{
@Override public void mouseClicked(MouseEvent e) {
  JTableHeader header = (JTableHeader) e.getSource();
  JTable table = header.getTable();
  TableColumnModel columnModel = table.getColumnModel();
  int vci = columnModel.getColumnIndexAtX(e.getX());
  int mci = table.convertColumnIndexToModel(vci);
  TableColumn column = table.getColumnModel().getColumn(mci);
  Rectangle r = header.getHeaderRect(vci);
  Container c = (Container) getTableCellRendererComponent(table, "", true, true, -1, vci);
  // if (!isNimbus) {
  //   Insets i = c.getInsets();
  //   r.translate(r.width - i.right, 0);
  // } else {
  r.translate(r.width - BUTTON_WIDTH, 0);
  r.setSize(BUTTON_WIDTH, r.height);
  Point pt = e.getPoint();
  if (c.getComponentCount() > 0 && r.contains(pt) && pop != null) {
    pop.show(header, r.x, r.height);
    JButton b = (JButton) c.getComponent(0);
    b.doClick();
    e.consume();
  }
}

@Override public void mouseExited(MouseEvent e) {
  rolloverIndex = -1;
}

@Override public void mouseMoved(MouseEvent e) {
  JTableHeader header = (JTableHeader) e.getSource();
  JTable table = header.getTable();
  TableColumnModel columnModel = table.getColumnModel();
  int vci = columnModel.getColumnIndexAtX(e.getX());
  int mci = table.convertColumnIndexToModel(vci);
  rolloverIndex = mci;
}
}}

* Description [#explanation]
* Description [#description]
- `JTableHeader`の各カラムにマウスカーソルがある場合、`HeaderRenderer#getTableCellRendererComponent(...)`内で右端に`JButton`を追加表示
-- この`JButton`がクリックされると`JPopupMenu`を開く
-- `JPopupMenu`の表示位置は`JTableHeader`に追加した`MouseListener`で取得して設定

* Reference [#reference]
- [https://docs.oracle.com/javase/jp/8/docs/api/javax/swing/table/TableColumnModel.html#getColumnIndexAtX-int- TableColumnModel#getColumnIndexAtX(int) (Java Platform SE 8)]

* Comment [#comment]
#comment
- `NimbusLookAndFeel`で`JPopupMenu`が表示されないバグを修正。 -- &user(aterai); &new{2011-11-07 (月) 22:15:02};

#comment