自JTree& TreeModel不提供直接开箱即用的工具提示,您认为什么是为JTree提供特定于项目的工具提示的最佳方式?
编辑:(之后回答我自己的问题。)
@Zarkonnen:感谢getTooltipText的想法。
我发现了覆盖DefaultTreeCellRenderer并考虑分享它的另一种方式(可能还是更好一点):
public class JTreeWithToolTips {
private static class OwnRenderer extends DefaultTreeCellRenderer {
@Override
public Component getTreeCellRendererComponent(JTree tree, Object value,
boolean sel, boolean expanded, boolean leaf, int row,
boolean hasFocus) {
setToolTipText("foobar" + row);
return super.getTreeCellRendererComponent(tree, value, sel,
expanded, leaf, row, hasFocus);
}
}
public static void main(String[] args) {
JTree tree = new JTree(new Object[] { "foo", "bar", "foobar" });
tree.setCellRenderer(new OwnRenderer());
ToolTipManager.sharedInstance().registerComponent(tree);
JFrame frame = new JFrame();
frame.getContentPane().add(tree);
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
答案 0 :(得分:15)
请参阅JTree上的getTooltipText。这应该允许您根据树中悬停的内容显示工具提示。 (但是,请阅读文档,您需要使用ToolTipManager注册JTree。)
答案 1 :(得分:1)
是的,你可以使用onMouseMoved
,然后使用一种方法(我不记得名字)告诉你你在哪个节点结束。如果你得到null,那么显然你不是在一个节点上。
答案 2 :(得分:0)
在处理特定的TreeNode
子类时,根据您自己的答案和评论,我想出了一个用于TreeNode
实现的界面。
请注意我们如何检查value
Tooltipable
中TreeCellRenderer
是否属于public static interface Tooltipable {
public String getToolTip();
}
public static class TheNode extends DefaultMutableTreeNode implements Tooltipable {
private String shortDesc, longDesc;
public TheNode(String shortDesc, String longDesc) {
super();
this.shortDesc = shortDesc;
this.longDesc = longDesc;
}
@Override
public String getToolTip() {
return longDesc;
}
@Override
public String toString() {
return shortDesc;
}
}
public static class TheModel extends DefaultTreeModel {
public TheModel() {
super(new TheNode("Root", "The base of everything"));
TheNode root = (TheNode)getRoot();
root.add(new TheNode("Second", "I am a number two"));
TheNode node = new TheNode("Third", "Another one bites the dust");
root.add(node);
node.add(new TheNode("Last", null)); // No tooltip for this one
}
}
public static class TreeTooltipRenderer extends DefaultTreeCellRenderer {
@Override
public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus) {
if (value instanceof Tooltipable)
setToolTipText(((Tooltipable)value).getToolTip());
return super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus);
}
}
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setBounds(100, 100, 300, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTree tree = new JTree(new TheModel());
ToolTipManager.sharedInstance().registerComponent(tree);
tree.setCellRenderer(new TreeTooltipRenderer());
frame.add(new JScrollPane(tree), BorderLayout.CENTER);
frame.setVisible(true);
}
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