禁用时 JTree 的自定义节点图标
我有一个 JTree，其中根据树中的节点深度显示不同的图标，这是使用以下代码完成的：
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);
int level = ((DefaultMutableTreeNode) value).getLevel());
JLabel label = (JLabel) this ;
if(level == 0) {
label.setIcon( new ImageIcon("icon1.gif") ) ;
}else if(level == 1) {
label.setIcon( new ImageIcon("icon2.png") ) ;
}
return this;
}
这按我的预期工作，除了如果禁用 JTree 组件，图标将恢复为（禁用）默认版本。 我是否需要创建图标的禁用版本？如果需要，如何使用此方法设置它们。我尝试添加：
if(!tree.isEnabled()) {
label.setIcon( new ImageIcon("icon1_disabled.gif") ) ;
}
...但我仍然保留禁用组件中的默认值。任何正确方向的提示将不胜感激。
I have a JTree in which I am displaying different icons according to a nodes depth in the tree, which I have done using the following code:
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);
int level = ((DefaultMutableTreeNode) value).getLevel());
JLabel label = (JLabel) this ;
if(level == 0) {
label.setIcon( new ImageIcon("icon1.gif") ) ;
}else if(level == 1) {
label.setIcon( new ImageIcon("icon2.png") ) ;
}
return this;
}
This works as I would expect, except that if the JTree component is disabled, the icons revert to the (disabled) versions of the defaults.
Do I need to create disabled versions of my icons, and if, so, how are they set using this method. I tried adding:
if(!tree.isEnabled()) {
label.setIcon( new ImageIcon("icon1_disabled.gif") ) ;
}
... but I am still left with the defaults in a disabled component. Any hints in the right direction would be appreciated.
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使用 label.setDisabledIcon(new ImageIcon("icon1_disabled.gif"));。我测试了它，似乎工作正常。
Use
label.setDisabledIcon(new ImageIcon("icon1_disabled.gif"));. I tested it and seems to work fine.