TITLE:JListのセルにJCheckBoxを使用する
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RIGHT:Posted by &author(aterai); at 2011-03-28
*JListのセルにJCheckBoxを使用する [#z6df133e]
JListのセルにJCheckBoxを使用して、チェックボックスの一覧を作成します。
-&jnlp;
-&jar;
-&zip;
//#screenshot
#ref(https://lh6.googleusercontent.com/_9Z4BYR88imo/TZAiQ_MSc_I/AAAAAAAAA4k/FiVk_o38jyY/s800/CheckBoxCellList.png)
**サンプルコード [#hbcc9907]
#code(link){{
class CheckBoxCellRenderer extends JCheckBox
implements ListCellRenderer, MouseListener, MouseMotionListener {
@Override public Component getListCellRendererComponent(
JList list,
Object value,
int index,
boolean isSelected,
boolean cellHasFocus) {
this.setOpaque(true);
if(isSelected) {
this.setBackground(list.getSelectionBackground());
this.setForeground(list.getSelectionForeground());
}else{
this.setBackground(list.getBackground());
this.setForeground(list.getForeground());
}
if(value instanceof CheckBoxNode) {
this.setSelected(((CheckBoxNode)value).selected);
if(index==pressedRowIndex) {
this.getModel().setArmed(true);
this.getModel().setPressed(true);
}else{
this.getModel().setRollover(index==rollOverRowIndex);
this.getModel().setArmed(false);
this.getModel().setPressed(false);
}
}
this.setText(value.toString());
return this;
}
private int rollOverRowIndex = -1;
private int pressedRowIndex = -3;
@Override public void mouseExited(MouseEvent e) {
rollOverRowIndex = -1;
JList c = (JList)e.getSource();
c.repaint();
}
@Override public void mouseClicked(MouseEvent e) {
if(e.getButton()==MouseEvent.BUTTON1) {
JList t = (JList)e.getComponent();
DefaultListModel m = (DefaultListModel)t.getModel();
Point p = e.getPoint();
int index = t.locationToIndex(p);
CheckBoxNode n = (CheckBoxNode)m.get(index);
Component c = t.getCellRenderer().getListCellRendererComponent(
t, n, index, false, false);
Dimension d = c.getPreferredSize();
if(d.width>=p.x) {
m.set(index, new CheckBoxNode(n.text, !n.selected));
t.repaint();
t.repaint(t.getCellBounds(index, index));
}
}
}
@Override public void mouseEntered(MouseEvent e) {}
private int pressStartIndex = -1;
@Override public void mousePressed(MouseEvent e) {
if(e.getButton()==MouseEvent.BUTTON1) {
JList c = (JList)e.getSource();
int row = c.locationToIndex(e.getPoint());
pressStartIndex = row;
if(row != pressedRowIndex) {
pressedRowIndex = row;
c.repaint();
}
}
}
@Override public void mouseReleased(MouseEvent e) {
pressedRowIndex = -1;
pressStartIndex = -1;
}
@Override public void mouseDragged(MouseEvent e) {
JList c = (JList)e.getSource();
int row = c.locationToIndex(e.getPoint());
if(row != rollOverRowIndex) {
rollOverRowIndex = -1;
}
if(row != pressedRowIndex) {
pressedRowIndex = -1;
}
if(row == pressStartIndex) {
pressedRowIndex = row;
}
c.repaint();
}
@Override public void mouseMoved(MouseEvent e) {
JList c = (JList)e.getSource();
int row = c.locationToIndex(e.getPoint());
if(row != rollOverRowIndex) {
rollOverRowIndex = row;
c.repaint();
}
}
}
}}
**解説 [#u07c22e4]
- 左: "JCheckBox Cell in JList"
-- JCheckBoxを継承するListCellRendererを設定
-- チェックボックスのロールオーバーなどは、JListにマウスリスナーを設定して表示
-- JList#putClientProperty("List.isFileList", Boolean.TRUE);で、クリックが有効になる領域をチェックボックスの幅に制限
- 右: "JCheckBox in Box"
-- Box.createVerticalBox()にJCheckBoxを追加
-- JCheckBox#setAlignmentX(Component.LEFT_ALIGNMENT);で左揃えに設定
----
[[JTreeの葉ノードをJCheckBoxにする>Swing/CheckBoxNodeTree]]のセルレンダラーを使ったJTreeに、JTree#setRootVisible(false)を設定しても、ほぼ同様のチェックボックスの一覧を作成することができます。
#code{{
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
public class TreeCheckBoxListTest {
public JComponent makeUI() {
DefaultMutableTreeNode root = new DefaultMutableTreeNode("JTree");
for(int i=0; i<16; i++) {
root.add(new DefaultMutableTreeNode(new CheckBoxNode("No."+i, i%2==0)));
}
JTree tree = new JTree(new DefaultTreeModel(root));
tree.setEditable(true);
tree.setRootVisible(false);
tree.setCellRenderer(new CheckBoxNodeRenderer());
tree.setCellEditor(new CheckBoxNodeEditor(tree));
return new JScrollPane(tree);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override public void run() {
createAndShowGUI();
}
});
}
public static void createAndShowGUI() {
JFrame f = new JFrame();
f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f.getContentPane().add(new TreeCheckBoxListTest().makeUI());
f.setSize(320, 240);
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}
class CheckBoxNode {
public final String text;
public final boolean selected;
public CheckBoxNode(String text, boolean selected) {
this.text = text;
this.selected = selected;
}
@Override public String toString() {
return text;
}
}
class CheckBoxNodeRenderer extends JCheckBox implements TreeCellRenderer {
private TreeCellRenderer renderer = new DefaultTreeCellRenderer();
@Override public Component getTreeCellRendererComponent(
JTree tree, Object value, boolean selected, boolean expanded,
boolean leaf, int row, boolean hasFocus) {
if(leaf && value != null && value instanceof DefaultMutableTreeNode) {
this.setOpaque(false);
Object userObject = ((DefaultMutableTreeNode)value).getUserObject();
if(userObject!=null && userObject instanceof CheckBoxNode) {
CheckBoxNode node = (CheckBoxNode)userObject;
this.setText(node.text);
this.setSelected(node.selected);
}
return this;
}
return renderer.getTreeCellRendererComponent(
tree, value, selected, expanded, leaf, row, hasFocus);
}
}
class CheckBoxNodeEditor extends JCheckBox implements TreeCellEditor {
private final JTree tree;
public CheckBoxNodeEditor(JTree tree) {
super();
this.tree = tree;
setOpaque(false);
setFocusable(false);
addActionListener(new ActionListener() {
@Override public void actionPerformed(ActionEvent e) {
stopCellEditing();
}
});
}
@Override public Component getTreeCellEditorComponent(
JTree tree, Object value, boolean isSelected, boolean expanded,
boolean leaf, int row) {
if(leaf && value != null && value instanceof DefaultMutableTreeNode) {
Object userObject = ((DefaultMutableTreeNode)value).getUserObject();
if(userObject!=null && userObject instanceof CheckBoxNode) {
this.setSelected(((CheckBoxNode)userObject).selected);
} else {
this.setSelected(false);
}
this.setText(value.toString());
}
return this;
}
@Override public Object getCellEditorValue() {
return new CheckBoxNode(getText(), isSelected());
}
@Override public boolean isCellEditable(EventObject e) {
return (e != null && e instanceof MouseEvent);
}
//Copid from AbstractCellEditor
//protected EventListenerList listenerList = new EventListenerList();
//transient protected ChangeEvent changeEvent = null;
@Override public boolean shouldSelectCell(java.util.EventObject anEvent) {
return true;
}
@Override public boolean stopCellEditing() {
fireEditingStopped();
return true;
}
@Override public void cancelCellEditing() {
fireEditingCanceled();
}
@Override public void addCellEditorListener(CellEditorListener l) {
listenerList.add(CellEditorListener.class, l);
}
@Override public void removeCellEditorListener(CellEditorListener l) {
listenerList.remove(CellEditorListener.class, l);
}
public CellEditorListener[] getCellEditorListeners() {
return listenerList.getListeners(CellEditorListener.class);
}
protected void fireEditingStopped() {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
// Process the listeners last to first, notifying
// those that are interested in this event
for(int i = listeners.length-2; i>=0; i-=2) {
if(listeners[i]==CellEditorListener.class) {
// Lazily create the event:
if(changeEvent == null) changeEvent = new ChangeEvent(this);
((CellEditorListener)listeners[i+1]).editingStopped(changeEvent);
}
}
}
protected void fireEditingCanceled() {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
// Process the listeners last to first, notifying
// those that are interested in this event
for(int i = listeners.length-2; i>=0; i-=2) {
if(listeners[i]==CellEditorListener.class) {
// Lazily create the event:
if(changeEvent == null) changeEvent = new ChangeEvent(this);
((CellEditorListener)listeners[i+1]).editingCanceled(changeEvent);
}
}
}
}
}}
//**参考リンク
**コメント [#d0ea5ae4]
#comment