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
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; j<selectionPaths.length; j++)
{
if(isDescendant(selectionPaths[j], path))
return true;
}
return false;
}
// tells whether given path is selected.
// if dig is true, then a path is assumed to be selected, if
// one of its ancestor is selected.
public boolean isPathSelected(TreePath path, boolean dig)
{
if(!dig)
return super.isPathSelected(path);
while(path!=null && !super.isPathSelected(path))
path = path.getParentPath();
return path!=null;
}
// is path1 descendant of path2
private boolean isDescendant(TreePath path1, TreePath path2)
{
Object obj1[] = path1.getPath();
Object obj2[] = path2.getPath();
for(int i = 0; i<obj2.length; i++)
{
if(obj1[i]!=obj2[i])
return false;
}
return true;
}
public void setSelectionPaths(TreePath[] pPaths)
{
throw new UnsupportedOperationException("not implemented yet!!!");
}
public void addSelectionPaths(TreePath[] paths)
{
// unselect all descendants of paths[]
for(int i = 0; i<paths.length; i++){
TreePath path = paths[i];
TreePath[] selectionPaths = getSelectionPaths();
if(selectionPaths==null)
break;
ArrayList toBeRemoved = new ArrayList();
for(int j = 0; j<selectionPaths.length; j++)
{
if(isDescendant(selectionPaths[j], path))
toBeRemoved.add(selectionPaths[j]);
}
super.removeSelectionPaths((TreePath[])toBeRemoved.toArray(new TreePath[0]));
}
// if all siblings are selected then unselect them and select parent recursively
// otherwize just select that path.
for(int i = 0; i<paths.length; i++)
{
TreePath path = paths[i];
TreePath temp = null;
while(areSiblingsSelected(path))
{
temp = path;
if(path.getParentPath()==null)
break;
path = path.getParentPath();
}
if(temp!=null)
{
if(temp.getParentPath()!=null)
addSelectionPath(temp.getParentPath());
else
{
if(!isSelectionEmpty())
removeSelectionPaths(getSelectionPaths());
super.addSelectionPaths(new TreePath[]{temp});
}
}
else
super.addSelectionPaths(new TreePath[]{ path});
}
}
// tells whether all siblings of given path are selected.
private boolean areSiblingsSelected(TreePath path)
{
TreePath parent = path.getParentPath();
if(parent==null)
return true;
Object node = path.getLastPathComponent();
Object parentNode = parent.getLastPathComponent();
int childCount = model.getChildCount(parentNode);
for(int i = 0; i<childCount; i++)
{
Object childNode = model.getChild(parentNode, i);
if(childNode==node)
continue;
if(!isPathSelected(parent.pathByAddingChild(childNode)))
return false;
}
return true;
}
public void removeSelectionPaths(TreePath[] paths)
{
for(int i = 0; i<paths.length; i++){
TreePath path = paths[i];
if(path.getPathCount()==1)
super.removeSelectionPaths(new TreePath[]{ path});
else
toggleRemoveSelection(path);
}
}
// if any ancestor node of given path is selected then unselect it
// and selection all its descendants except given path and descendants.
// otherwise just unselect the given path
private void toggleRemoveSelection(TreePath path)
{
Stack stack = new Stack();
TreePath parent = path.getParentPath();
while(parent!=null && !isPathSelected(parent))
{
stack.push(parent);
parent = parent.getParentPath();
}
if(parent!=null)
stack.push(parent);
else{
super.removeSelectionPaths(new TreePath[]{path});
return;
}
while(!stack.isEmpty())
{
TreePath temp = (TreePath)stack.pop();
TreePath peekPath = stack.isEmpty() ? path : (TreePath)stack.peek();
Object node = temp.getLastPathComponent();
Object peekNode = peekPath.getLastPathComponent();
int childCount = model.getChildCount(node);
for(int i = 0; i<childCount; i++){
Object childNode = model.getChild(node, i);
if(childNode!=peekNode)
super.addSelectionPaths(new TreePath[]{temp.pathByAddingChild(childNode)});
}
}
super.removeSelectionPaths(new TreePath[]{parent});
}
}
3.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呐喊教程。
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