I am trying to make simple Setting GUI in Java (IDE Eclipse).
On the left is JTree (7 nodes), on the right is layeredPane with 7 panels (JPanel). I want to browse panels by simple clicking on nodes in JTree.
But how to do it? Especially i do not know how to link node with this appropriate Panel. I do not know how to tag it, or to assign it as an object to the node.
P.S
1. I do not know, if there is more efficient way to do it.
2. I am new in Java, but not in programming. In Delphi there is no problem for me...
Thanx a lot
Each TreeNode has index which you can use to link to your panel.
If you use MutableTreeNode (default implementation is DefaultMutableTreeNode) you can assign custom user object to each node - see JavaDoc for MutableTreeNode and DefaultMutableTreeNode.
Related
I read the method here to create the label of node through embedded Java Api. But in my problem the label is dynamic because of correction. So, is there a way to change the label?
Without this facility the alternate solution I have thought is to create nodes of 'labels' and create edge from entity node to that 'label' node. But this may lead to some disadvantages as not able to make use of index over the label.
You can remove labels from nodes using:
node.removeLabel(DynamicLabel.label("MyLabel"));
And you can find all the nodes with the incorrect label using the global operations:
GlobalGraphOperations.at(graphDB).getAllNodesWithLabel( DynamicLabel.label("MyLabel") );
Iam studying about JTree right now.
But i don´t know how to render content of choosen JTrees node in e.g. bottom part of my application.
Lets say i would make application with content - see my picture.
I know how to make JTree, but how to manage - if i click on e.g. SUV just bottom part of my application will change the content, JTree remains and upper part as well. still just bottom part changes its content. e.g. suv - info about SUV, CABRIO - info abou cabrio.
Do I need another JPanels for upper part which will be stable?
Do I need another JPanels for botton part which will not be stable?
I really need help with this issue, or some link, where can i find answer on my question
Thanks
You need two separate components:
A JTree
A separate JPanel
You need to add a TreeSelectionListener to the JTree. That will let you know when the user has selected one of the values in the JTree, and you can use that selection to change the contents of the JPanel.
You'll need another JPanel for your area labeled, "This part remains the same". You will probably want to put the two JPanels in a JSplitPane with a VERTICAL_SPLIT.
I'm intentionally leaving out some of the implementation details because it looks like you're completing a homework assignment.
Compound JTree Node allowing events to pass through to objects underneath
I went through the answer by #Jakub Zaverka ,which was pretty lucid.But what I could not understand is where is the code to create tree nodes (JTree ,food,sports,colors).
Could someone explain how the nodes are created.
If I create a Node extending JPanel having a JButton and JLabel as fields ,can I set the node using the constructor of JTree which would be rendered and edited by the same custom renderer and editor.
The default JTree constructor "Returns a JTree with a sample model." To get the sample model, the constructor invokes the protected method getDefaultTreeModel(), which returns a sample model that is "Used primarily for beanbuilders to show something interesting." The values you see are contained in the source. A related example is seen here.
I need help on JavaHelp. The context-sensitive help offers, window-level, field-level (as in passing the component).
But i need to activate the JavaHelp when user press the HelpKey F1 or JavaHelp button from the tree node (the application built-in : Eclipse).
Since the tree node is not a component, so it cannot directly call the enableHelpKey or enableHelpOnButton. Furthermore, i need to open the selected JavaHelp content based on selected tree node (example there 3 node courseware : Science, Math, English)
Really appreciate for ideas and help on this.
Thanks.
The tree nodes are not JComponents but they are hosted in a JTree or other JComponent (JPanel). I would try to add a selection listener to the JTree and adjust the help topic for the JTree or JPanel.
I have a question about how to dynamically generate JTrees. Is there a way to set the Root Node invisible without making its children invisible too? I have tried to do the following but it shows all nodes as invisible. Keep in mind that I want to add and remove children of the Root Node at any point in time. I've added comments so you can follow what I intend to do. Let me know if they are doing something I dont need, as I am new to JTrees and don't know the conventions. I would also like to be able to select multiple children for the listener.
DefaultMutableTreeNode rootNode;
rootNode = new DefaultMutableTreeNode(); //I want this invisible.
DefaultTreeModel treeModel = new DefaultTreeModel(rootNode);
JTree tree = new JTree(treeModel);
treeModel.addTreeModelListener(this);
tree.setRootVisible(false); // Sets everything invisible
tree.setEditable(true); //makes tree dynamic
tree.setShowsRootHandles(true); //supposedly allows you to see the children of the nodes.
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
//I would like the line above to be multi-select; however, this doesn't seem to be an option.
DefaultMutableTreeNode table = new DefaultMutableTreeNode( "table1");
rootNode.add(book);
DefaultMutableTreeNode value = new DefaultMutableTreeNode( "value");
table.add(value);
In the above example. Nothing is shown and when I remove the "tree.setRootVisible(false)" everything is visible including the node.
A very late answer, but I have just had the same problem.
Ensure to expand your root node, so that its children become visible :
yourTree.expandPath(new TreePath(root.getPath()))
I'd say the difference between the code in the question and in the TreeDemo is that the tree demo creates and adds all its nodes before creating the actual tree. If the nodes are to be added dynamically (after the tree is created) it should be done through the TreeModel. Otherwise no events saying the tree has changed will be generated. At least that is what the tutorial seems to say about editing the node's "content", might be the same issue:
Note that although DefaultMutableTreeNode has methods for changing a
node's content, changes should go through the DefaultTreeModel cover
methods. Otherwise, the tree model events would not be generated, and
listeners such as the tree would not know about the updates.
Someone's solution
Works fine for me. I based my tests on the TreeDemo from the Swing tutorial on How to Use Trees. Compare your code with the tutorial code to see what the difference is.
A very late answer also, I'm a java beginner and had the same problem so it may help.
setRootVisible(false) also hides all nodes for me so I added setShowsRootHandles(true) to show all nodes :
tree.setRootVisible(false);
tree.setShowsRootHandles(true)
I hope it helps !
https://docs.oracle.com/javase/tutorial/uiswing/components/tree.html#display