既然JTree和TreeModel不能直接提供开箱即用的工具提示,那么您认为为JTree提供特定于项目的工具提示的最佳方式是什么呢?
编辑:(稍后回答我自己的问题。)
@Zarkonnen:谢谢你的getTooltipText点子。
我发现了另一种覆盖DefaultTreeCellRenderer的方法(可能还是更好),并想分享一下:
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);
}
}
发布于 2008-11-07 14:15:21
请参阅JTree上的getTooltipText。这应该允许您根据悬停在树上的内容来显示工具提示。(不过,一定要阅读文档,您需要向ToolTipManager注册JTree。)
发布于 2009-11-21 13:33:06
是的,你可以使用onMouseMoved
,然后使用一个方法(我不记得名字了)来告诉你你所在的节点。如果你得到null,很明显你不是在一个节点上。
发布于 2017-09-07 05:43:34
在处理特定的TreeNode
子类时,根据您自己的回答和评论,我为我的TreeNode
提出了一个接口来实现。
注意我们如何检查value
是否是TreeCellRenderer
中的Tooltipable
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);
}
https://stackoverflow.com/questions/272124
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