Swing/CellHighlight のバックアップの現在との差分(No.9)
TITLE:JTableのセルのハイライト
JTableのセルのハイライト
編集者:Terai Atsuhiro~
作成日:2004-03-21
更新日:2021-11-18 (木) 11:29:54
- category: swing folder: CellHighlight title: JTableのセルのハイライト tags: [JTable, TableCellRenderer, MouseListener, MouseMotionListener] author: aterai pubdate: 2005-03-21T07:27:38+09:00 description: JTableのセル上にマウスカーソルが存在する場合、その背景色を変更します。 image:
概要
JTableのセル上にマウスカーソルが存在する場合、その背景色を変更します。
概要
セル上にマウスがある場合、その色を変更します。Screenshot
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#screenshot
サンプルコード
#spanend
#spandel
class TestRenderer extends DefaultTableCellRenderer
#spanend
implements MouseListener, MouseMotionListener {
private final JTable table;
#spanadd
* サンプルコード [#sourcecode]
#spanend
#spanadd
#code(link){{
#spanend
#spanadd
class HighlightListener extends MouseAdapter {
#spanend
private int row = -1;
private int col = -1;
public TestRenderer(JTable table) {
super();
private final JTable table;
#spanadd
#spanend
public HighlightListener(JTable table) {
this.table = table;
table.addMouseListener(this);
table.addMouseMotionListener(this);
}
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus,
int row, int column) {
super.getTableCellRendererComponent(table, value, isSelected, hasFocus,
row, column);
setHorizontalAlignment((value instanceof Number)?RIGHT:LEFT);
if(this.row==row && this.col==column) {
setBackground(Color.RED);
}else{
setBackground(isSelected?table.getSelectionBackground()
:table.getBackground());
}
return this;
#spanadd
#spanend
public boolean isHighlightableCell(int row, int column) {
return this.row == row && this.col == column;
}
public void mouseMoved(MouseEvent e) {
#spanadd
#spanend
@Override public void mouseMoved(MouseEvent e) {
Point pt = e.getPoint();
row = table.rowAtPoint(pt);
col = table.columnAtPoint(pt);
if(row<0 || col<0) {
if (row < 0 || col < 0) {
row = -1;
col = -1;
}
table.repaint();
}
public void mouseExited(MouseEvent e) {
#spanadd
#spanend
@Override public void mouseExited(MouseEvent e) {
row = -1;
col = -1;
table.repaint();
}
public void mouseDragged(MouseEvent e) {}
public void mouseClicked(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mousePressed(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
}
#spandel
- &jnlp;
- &jar;
- &zip;
解説
MouseListener、MouseMotionListenerをimplementsしたセルレンダラーを作成し、マウスカーソルが乗っているセルの色を変更しています。 class HighlightRenderer extends DefaultTableCellRenderer { private final HighlightListener highlighter;
JTable#prepareRendererをオーバーライドする場合も、同様の方法が使用できます。
#spanend
#spandel
class MyTable extends JTable implements MouseListener, MouseMotionListener {
#spanend
private int row = -1;
private int col = -1;
public MyTable() {
public HighlightRenderer(JTable table) {
super();
addMouseListener(this);
addMouseMotionListener(this);
highlighter = new HighlightListener(table);
table.addMouseListener(highlighter);
table.addMouseMotionListener(highlighter);
}
public MyTable(TableModel model) {
#spanadd
#spanend
@Override public Component getTableCellRendererComponent(JTable table,
Object value, boolean isSelected, boolean hasFocus,
int row, int column) {
super.getTableCellRendererComponent(
table, value, isSelected, hasFocus, row, column);
setHorizontalAlignment((value instanceof Number) ? RIGHT : LEFT);
if (highlighter.isHighlightableCell(row, column)) {
setBackground(Color.RED);
} else {
setBackground(isSelected ? table.getSelectionBackground()
: table.getBackground());
}
return this;
}
#spanadd
}
#spanend
#spanadd
解説
上記のサンプルでは、JTableにMouseListener、MouseMotionListenerを追加してマウスカーソルが乗っているセルを取得し、セルレンダラーでこれを参照してその背景色を変更しています。
-
JTable#prepareRenderer(...)メソッドをオーバーライドする方法もある#spanend #spanadd class HighlightableTable extends JTable { #spanend private final HighlightListener highlighter; #spanadd #spanend public HighlightableTable(TableModel model) { super(model); addMouseListener(this); addMouseMotionListener(this); highlighter = new HighlightListener(this); addMouseListener(highlighter); addMouseMotionListener(highlighter); } public Component prepareRenderer(TableCellRenderer renderer, int row, int column) { Component c = super.prepareRenderer(renderer, row, column); if(this.row==row && this.col==column) { #spanadd #spanend @Override public Component prepareRenderer( TableCellRenderer r, int row, int column) { Component c = super.prepareRenderer(r, row, column); if (highlighter.isHighlightableCell(row, column)) { c.setBackground(Color.RED); }else if(isRowSelected(row)) { } else if (isRowSelected(row)) { c.setBackground(getSelectionBackground()); }else{ } else { c.setBackground(Color.WHITE); } return c; } public void mouseMoved(MouseEvent e) { Point pt = e.getPoint(); row = rowAtPoint(pt); col = columnAtPoint(pt); if(row<0 || col<0) { row = -1; col = -1; } repaint(); } public void mouseExited(MouseEvent e) { row = -1; col = -1; repaint(); } public void mouseDragged(MouseEvent e) {} public void mouseClicked(MouseEvent e) {} public void mouseEntered(MouseEvent e) {} public void mousePressed(MouseEvent e) {} public void mouseReleased(MouseEvent e) {} }