[英]Change JTree icons based on custom Object states
我有一个基于几个自定义类的JTree。 我想给几个节点一个特定的图标。 因此,我基于此链接执行了以下代码: 动态更改JTree中特定节点的图标
DefaultTreeCellRenderer renderer = new DefaultTreeCellRenderer() {
private static final long serialVersionUID = 1L;
private Icon good = new ImageIcon(getClass().getResource("/good.png"));
private Icon dunno = new ImageIcon(getClass().getResource("/dunno.png"));
private Icon bad = new ImageIcon(getClass().getResource("/bad.png"));
@Override
public Component getTreeCellRendererComponent(JTree tree,
Object value, boolean selected, boolean expanded,
boolean isLeaf, int row, boolean focused) {
Component c = super.getTreeCellRendererComponent(tree, value, selected, expanded, isLeaf, row, focused);
// JTreePanelNode node = (JTreePanelNode)c; - not possible
return c;
}
};
this.getTree().setCellRenderer(renderer);
我的每个节点都是JTreePanelNode(自定义类)的对象,该对象保存可以通过setState(String s)设置并通过getState()获取的特定状态。 所以我想要的是这样的事情:
if(node.getState().equals("good")) ..
else if(node.getState.equals("bad")) ..
else ..
我怎样才能实现这样的目标? 据我了解,渲染器使用getTreeCellRendererComponent遍历每个节点,并应用一个特定的图标,我可以使用setIcon和多个ifs()进行选择。 但是我无法转换为JTreePanelNode。 有什么办法吗? 谢谢 :)
全部取决于您的JTreePanelNode类。 如果它实现了TreeNode接口,那么您可以选择:
public Component getTreeCellRendererComponent(JTree tree, Object value,
boolean sel, boolean expanded, boolean leaf, int row,
boolean hasFocus) {
Component comp = super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf,
row, hasFocus);
TreeNode current = (TreeNode)value;
if (leaf) {
//set leaf icon
} else if (expanded) {
//set expanded icon
} else {
// set default state
}
if (hasFocus)
//set what it looks like if focused
else if (selected)
//set what it looks like if selected
else
//set default l&f
comp.setIcon(whatevericonset in above conditions);
return comp;
}
当然,您可以根据节点class.getState()添加更多状态。
您可以访问该树中表示的对象:
@Override
public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean isLeaf, int row, boolean focused) {
Component c = super.getTreeCellRendererComponent(tree, value, selected, expanded, isLeaf, row, focused);
DefaultMutableTreeNode node = (DefaultMutableTreeNode ) value;
Object representedObject = node.getUserObject();
JLabel superLabel = super.getTreeCellRendererComponent();
String text = label.getText();
if(object.isGood() ){ //i don't know your code
superLabel .setText (text +"goooooooood");
}else{
superLabel .setText (text +"badbadbabd");
}
return superLabel ;
}
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