Interface TreeCellRenderer
- All Known Implementing Classes:
DefaultTreeCellRenderer
public interface TreeCellRenderer
Defines the requirements for an object that displays a tree node. See How to Use Trees in The Java Tutorial for an example of implementing a tree cell renderer that displays custom icons.
Method Summary
Modifier and Type | Method | Description |
---|---|---|
Component | getTreeCellRendererComponent(JTree tree,
Object value,
boolean selected,
boolean expanded,
boolean leaf,
int row,
boolean hasFocus) | Sets the value of the current tree cell to |
Method Detail
getTreeCellRendererComponent
Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus)
Sets the value of the current tree cell to value
. If selected
is true, the cell will be drawn as if selected. If expanded
is true the node is currently expanded and if leaf
is true the node represents a leaf and if hasFocus
is true the node currently has focus. tree
is the JTree
the receiver is being configured for. Returns the Component
that the renderer uses to draw the value.
The TreeCellRenderer
is also responsible for rendering the the cell representing the tree's current DnD drop location if it has one. If this renderer cares about rendering the DnD drop location, it should query the tree directly to see if the given row represents the drop location:
JTree.DropLocation dropLocation = tree.getDropLocation(); if (dropLocation != null && dropLocation.getChildIndex() == -1 && tree.getRowForPath(dropLocation.getPath()) == row) { // this row represents the current drop location // so render it specially, perhaps with a different color }
- Parameters:
-
tree
- the receiver is being configured for -
value
- the value to render -
selected
- whether node is selected -
expanded
- whether node is expanded -
leaf
- whether node is a lead node -
row
- row index -
hasFocus
- whether node has focus - Returns:
- the
Component
that the renderer uses to draw the value