Tree Renderer"
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Revision as of 08:18, 11 January 2022
When a tree (Tree) is assigned with a model, a default renderer is assigned too[1]. The default renderer will assume that each tree item has only one column, and it converts the data into a string directly[2]. If you want to display multiple columns or retrieve a particular field of the data, you have to implement TreeitemRenderer to handle the rendering.
For example,
public class HostTreeRenderer implements TreeitemRenderer {
public void render(Treeitem treeitem, Object data, int index) throws Exception {
Treerow row = treeitem.getTreerow();
if (row == null) { // tree row not create yet.
row = new Treerow();
treeitem.appendChild(row);
}
if (data instanceof HostTreeModel.FakeGroup) {
treeitem.getTreerow().appendChild(new Treecell(((HostTreeModel.FakeGroup)data).getName()));
} else if (data instanceof HostTreeModel.FakeHost) {
treeitem.getTreerow().appendChild(new Treecell(((HostTreeModel.FakeHost)data).getName()));
} else if (data instanceof HostTreeModel.FakeProcess) {
treeitem.getTreerow().appendChild(new Treecell(((HostTreeModel.FakeProcess)data).getName()));
}
}
}
- ↑ For the concept about component, model and renderer, please refer to the Model-driven Display section.
- ↑ If the tree is assigned a template called model, then the template will be used to render the tree. For more information, please refer to the Tree Template section.
Version History
| Version | Date | Content |
|---|---|---|
| 6.0.0 | February 2012 | The index argument was introduced. |