本文实例为大家分享了java JTree JCheckBox树复选框展示的具体代码，供大家参考，具体内容如下
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1.CheckTreeManager.java
public class CheckTreeManager extends MouseAdapter implements TreeSelectionListener
{
private CheckTreeSelectionModel selectionModel = null;
// private JTree tree = new JTree();
private JTree tree = null;
int hotspot = new JCheckBox().getPreferredSize().width;
public CheckTreeManager(JTree tree)
{
this.tree = tree;
selectionModel = new CheckTreeSelectionModel(tree.getModel());
tree.setCellRenderer(new CheckTreeCellRenderer(tree.getCellRenderer(), selectionModel));
tree.addMouseListener(this); //鼠标监听
selectionModel.addTreeSelectionListener(this); //树选择监听
}
public void mouseClicked(MouseEvent me)
{
TreePath path = tree.getPathForLocation(me.getX(), me.getY());
if(path==null)
return;
if(me.getX()>tree.getPathBounds(path).x+hotspot)
return;
boolean selected = selectionModel.isPathSelected(path, true);
selectionModel.removeTreeSelectionListener(this);
try
{
if(selected)
selectionModel.removeSelectionPath(path);
else
selectionModel.addSelectionPath(path);
}
finally
{
selectionModel.addTreeSelectionListener(this);
tree.treeDidChange();
}
}
public CheckTreeSelectionModel getSelectionModel()
{
return selectionModel;
}
public void valueChanged(TreeSelectionEvent e)
{
tree.treeDidChange();
}
}
2.CheckTreeSelectionModel.java
public class CheckTreeSelectionModel extends DefaultTreeSelectionModel
{
private TreeModel model;
public CheckTreeSelectionModel(TreeModel model)
{
this.model = model;
setSelectionMode(TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION);
}
// tests whether there is any unselected node in the subtree of given path
public boolean isPartiallySelected(TreePath path){
if(isPathSelected(path, true))
return false;
TreePath[] selectionPaths = getSelectionPaths();
if(selectionPaths==null)
return false;
for(int j = 0; j3.CheckTreeCellRenderer .java
public class CheckTreeCellRenderer extends JPanel implements TreeCellRenderer
{
private CheckTreeSelectionModel selectionModel;
private TreeCellRenderer delegate;
// private TristateCheckBox checkBox = new TristateCheckBox();
private JCheckBox checkBox = new JCheckBox();
public CheckTreeCellRenderer(TreeCellRenderer delegate, CheckTreeSelectionModel selectionModel){
this.delegate = delegate;
this.selectionModel = selectionModel;
setLayout(new BorderLayout());
setOpaque(false);
checkBox.setOpaque(false);
}
public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus){
Component renderer = delegate.getTreeCellRendererComponent(tree, value, selected, expanded, leaf, row, hasFocus);
TreePath path = tree.getPathForRow(row);
if(path!=null)
{
System.out.println(path);
if(selectionModel.isPathSelected(path, true))
checkBox.setSelected(true);
else
{
System.out.println(selectionModel.isPartiallySelected(path));
checkBox.setSelected(selectionModel.isPartiallySelected(path) ? true : false);
}
}
removeAll();
add(checkBox, BorderLayout.WEST);
add(renderer, BorderLayout.CENTER);
return this;
}
}
4.用法
CheckTreeManager checkTreeManager = new CheckTreeManager(jTree);
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持创新互联。
