jtree custom icons help

Question

4.00/5 (1 vote)

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i'm creeting a tree view for the file system....in order to assgin different icons to each node i'm overriding getTreeCellRendererComponent in the following manner

C#

public Component getTreeCellRendererComponent(JTree tree, Object value,boolean sel, boolean expanded, boolean leaf, int row,boolean hasFocus) 
{
  System.out.println("in cell renderer");
  FileSystemView fsv=FileSystemView.getFileSystemView();
  DefaultMutableTreeNode dmtn = (DefaultMutableTreeNode) value;
  File nodefile=(File)dmtn.getUserObject();//i'm getting below mentioned exception here
  Icon icon;
  String filename = "";
  if (nodefile != null) 
  {
    if (ismynodefilesystem(nodefile)) 
    {
       if (filename == null) 
       {
         filename = fsv.getSystemDisplayName(nodefile);
       }
    } 
    else  
    {
      filename = nodefile.getName();
    }
  }
  JLabel result = (JLabel) super.getTreeCellRendererComponent(tree,filename, sel, expanded, leaf, row, hasFocus);
  if (nodefile != null) 
  {
    icon = fsv.getSystemIcon(nodefile);
    result.setIcon(icon);
  }
  return result;
}

i have assigned a File object to each node using setUserObject()
i'm getting an exception as:

Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: java.lang.String cannot be cast to java.io.File<br />
at line:File nodefile=(File)dmtn.getUserObject();<br />

please help me with this code and do point out my mistakes
thanks

Posted 15-Jun-11 9:47am

ankit_khedekar

Updated 15-Jun-11 18:28pm

pankajupadhyay29

v3

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Comments

pankajupadhyay29 16-Jun-11 0:29am

Edited for adding pre tag and formatting

2 solutions

Solution 1

tried this?

File nodefile=new File(dmtn.getUserObject());

what happens if you do so?

PLease also check this site: Swing JTree Tutorial[^] Section 5 is about the icons on the tree.

EDIT: try this Showing the file system as a Swing JTree[^]

Both will not meet your exact problem - but with a bit of creativity lead you to a suitable solution.

Posted 15-Jun-11 19:48pm

TorstenH.

Updated 16-Jun-11 20:09pm

v2

Comments

ankit_khedekar 16-Jun-11 13:17pm

File nodefile=new File(dmtn.getUserObject());

i get a compilation error:
cannot fine symbol
symbol:constructor File(java.lang.Object)

the tutorial you mentioned is something i had already gone through.it lets you assign open-node icon,close-node icon and leaf icons i.e. all the close-nodes will have the same icon and same with open-node and leaf
whereas what want is the icon should based on the file associated with the node

ankit_khedekar 17-Jun-11 5:58am

that was solved but now i'm stuck at this:
my tree is created perfectly and is also working perfectly,but when i click on a node the node name doesn't get highlighted.the nodes do expand and collapse on clicks
why is it can u help me

i tried this like
[Code]myrenderer.setBackgroundSelectionColor(Color.blue);[/Code]

but this didnt work.
please help

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ankit_khedekar · Accepted Answer · 2011-06-16T09:34:00

dont know how but this solved my problem

MSIL

public Component getTreeCellRendererComponent(JTree tree, Object value,
                boolean sel, boolean expanded, boolean leaf, int row,
                boolean hasFocus)
     {
        System.out.println("value is :"+value.getClass());
        if ((value != null) && (value instanceof DefaultMutableTreeNode)) {
      Object userObject = ((DefaultMutableTreeNode) value)
          .getUserObject();
      System.out.println("node is dmtn");
      if(userObject instanceof File)
      {
          System.out.println("value is file");
          File tempfile=(File)userObject;
         this.setText(tempfile.getName());
          this.setIcon(fsv.getSystemIcon(tempfile));
      }
         }

        return this;
    }