Interface TreeCellRenderer

All Known Implementing Classes:

DefaultTreeCellRenderer

public interface TreeCellRenderer

Port of TreeCellRenderer. Returns Component so the renderer hands back our emulator's Component hierarchy — JDK's java.awt.Component return type is incompatible with our hierarchy and is the central reason this interface is ported wholesale rather than reused (D_event_port_policy + the cell-renderer carve-out; mirrors ListCellRenderer and TableCellRenderer).

The tree parameter is typed JTree; the D_jtree_renderer_registry bridge passes the emulator JTree, so renderers down-casting or reading tree.convertValueToText(...) (the DefaultTreeCellRenderer pattern) work as written. null is tolerated for renderers invoked from a pure-surrogate context.

Method Summary

Modifier and Type	Method	Description
Component	getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus)	Build the rendering component for value.

Method Details

getTreeCellRendererComponent

Component getTreeCellRendererComponent(JTree tree,
 Object value,
 boolean selected,
 boolean expanded,
 boolean leaf,
 int row,
 boolean hasFocus)

Build the rendering component for value.

Parameters:

tree - the rendering host — the emulator JTree in emulator flow, null from pure-surrogate contexts.

value - the node to render. null is valid.

selected - whether the node is currently selected.

expanded - whether the node is currently expanded.

leaf - whether the node is a leaf per the model.

row - the node's visible-row index, or -1 when the node isn't currently displayed.

hasFocus - always false from the D_jtree_renderer_registry bridge — Vaadin TreeGrid has no per-cell focus signal at render time (R_vaadin_first sub-bucket (c)).