1
我创建了一个TreeView,应该有不同的图形树结构的不同层次。它是一个三层结构,其中根是隐藏的。JavaFX TreeView:setGraphic()为不同层次的树项目
的可扩展节点的图形: http://i.imgur.com/wv00CEi.png
图形叶节点:
只是在横向盒标签。
这是我到目前为止已经试过,但我得到一个NullPointerException基本上说getTreeView为空:
CustomTreeCellFactory
public final class CustomTreeCellFactory extends TreeCell<String>{
private TextField textField;
private HBox hBox;
public CustomTreeCellFactory(){
super();
if (getTreeView()==null){
System.out.println("Her er problem");
}
if (getTreeView().getTreeItemLevel(getTreeItem())==1){
try {
hBox = (HBox) FXMLLoader.load(getClass().getResource("/Views/TreCell.fxml"));
} catch (IOException e) {
System.out.println("This didn't work");
e.printStackTrace();
}
}
else if (getTreeView().getTreeItemLevel(getTreeItem())==2){
try {
hBox = (HBox) FXMLLoader.load(getClass().getResource("/Views/TreCellLowestLevel.fxml"));
} catch (IOException e) {
System.out.println("This didn't work");
e.printStackTrace();
}
}
}
代码段从哪里设置单元格工厂
TreeView<String> tree = (TreeView) parent.getChildren().get(0);
tree.setRoot(root);
tree.setShowRoot(false);
tree.setEditable(true);
tree.setCellFactory(new Callback<TreeView<String>, TreeCell<String>>() {
@Override
public TreeCell<String> call(TreeView<String> param) {
return new CustomTreeCellFactory();
}
});