将图标设置为Jtree中的每个节点
我想为我的JTree中的每个节点设置一个不同的图标,实际上我是从数据库加载每个节点,用“while”,我将每个图标设置为root,leaf或parent。 喜欢这个:
我的所有声明都是全球性的:
private ResultSet myResultSet; protected DefaultTreeModel treeModel; private DefaultMutableTreeNode rootNode,childNode,parent1,parent2;
这是我设置节点的代码:
myResultSet=rtnNodes(); /*Method that returns a RS with my nodes*/ while(myResultSet.next()){ switch(myResultSet.getInt(1)){ /*The first column is the type of node: root, parent, leaf...*/ case 0: treeModel = new DefaultTreeModel((rootNode=new DefaultMutableTreeNode(myResultSet.getString(2)))); break; /*root node*/ case 1: case 4: parent1 = parent2 = makeNode(rootNode); break; /*parent node*/ case 2: makeNode(parent2); break; /*leaf node*/ case 3: parent2 = makeNode(parent1); break; /*sub patern node*/ } /*makeNode is the method where I create the nodes*/ }
方法makeNode是这样的:
public DefaultMutableTreeNode makeNode(DefaultMutableTreeNode parent){ //The second column in the RS is the name of the node treeModel.insertNodeInto((childNode=new DefaultMutableTreeNode(myResultSet.getString(2))),parent,parent.getChildCount()); return childNode; }
在用我的节点填充树模型之后,我将模型设置为我的JTree:
myJTree.setModel(treeModel); myJTree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
但问题是。 当我尝试设置图标时。 我创建了一个名为myTreeRenderer的子类,我使用它:
myJTree.setCellRenderer(new treeRenderer());
但它没有按我的意愿设置图标,子类是:
private ImageIcon root,parent,leaf; public myTreeRenderer() { root=setIcons(2); /*setIcons is a method that I dont publish in this post, that helps me to set the path of the icons*/ parent=setIcons(3); leaf=setIcons(4); } @Override public Component getTreeCellRendererComponent(JTree tree,Object value,boolean selected,boolean expanded,boolean leaf,int row,boolean hasFocus){ super.getTreeCellRendererComponent(tree,value,selected,expanded,leaf,row,hasFocus); DefaultMutableTreeNode nodo = (DefaultMutableTreeNode)value; TreeNode t = nodo.getParent(); if(t!=null){ setIcon(root); } return this; }
如何在不使用他的名字的情况下为每个节点设置图标? 子类的代码,按原样设置所有节点具有相同的图标,每次我在jtree中选择一个节点,getTreeCellRendererComponent运行,我不想这样。
您可以更改JTree
节点图标的默认UI值,而无需任何自定义渲染器:
URL resource = logaff.class.getResource(IMAGE); Icon icon = new ImageIcon(resource); UIManager.put("Tree.closedIcon", icon); UIManager.put("Tree.openIcon", icon); UIManager.put("Tree.leafIcon", icon);
或使用下一个:
@Override public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) { super.getTreeCellRendererComponent(tree, value, selected,expanded, leaf, row, hasFocus); DefaultMutableTreeNode nodo = (DefaultMutableTreeNode) value; if (tree.getModel().getRoot().equals(nodo)) { setIcon(root); } else if (nodo.getChildCount() > 0) { setIcon(parent); } else { setIcon(leaf); } return this; }
另请阅读渲染机制 。
您可以使用它,一种较短的方式。 “tree”是我的JTree组件。
DefaultTreeCellRenderer renderer = (DefaultTreeCellRenderer) tree.getCellRenderer(); Icon closedIcon = new ImageIcon("closed.png"); Icon openIcon = new ImageIcon("open.png"); Icon leafIcon = new ImageIcon("leaf.png"); renderer.setClosedIcon(closedIcon); renderer.setOpenIcon(openIcon); renderer.setLeafIcon(leafIcon);