将图标设置为Jtree中的每个节点 [英] Set icon to each node in Jtree
问题描述
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,使用while,我将每个图标设置为root,leaf或parent。像这样:
I want to set for each node in my JTree a different icon, actually I'm loading each node from a data base, with a "while", I set each icon like a root, leaf or parent. Like this:
我的所有声明都是全局的:
All my declarations are global:
private ResultSet myResultSet;
protected DefaultTreeModel treeModel;
private DefaultMutableTreeNode rootNode,childNode,parent1,parent2;
这是我设置节点的代码:
And this is the code where I set my nodes:
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:
The method makeNode is this:
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 :
After to fill the treemodel with my nodes, I set the model to my 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:
But the problem is. when I try to set the icons. I create a subclass called myTreeRenderer, and I use this:
myJTree.setCellRenderer(new treeRenderer());
但它没有设置我想要的图标,子类是:
But it doesn't set the icons as I want, the subclass is:
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都有相同的图标,每次我在jtree中选择一个节点,getTreeCellRendererComponent运行,我不想这样。
How I can set the icon for each node without using his name? The code of the subclass, as is, set all the nodes with the same icon, and each time I selected a node in the jtree, the getTreeCellRendererComponent runs, I don´t want this.
推荐答案
您可以在没有任何自定义渲染器的情况下更改 JTree
节点图标的默认UI值:
You can change default UI values for icons of JTree
nodes without any custom renderer:
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。
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