您好，我正在尝试实现一个 TreeView，它能够通过 TreeView 中的 ContextMenu 创建一个新元素。但是，我希望新元素能够集中调用 startEdit() 方法并自己给它起一个名字。有没有什么办法可以做到...
这是我的代码：
public class NotesBrowser extends TreeView<String>
{
public NotesBrowser()
{
this.setEditable(true);
IconView rootIcon = new IconView(Resources.rootImage);
rootIcon.setSize(28.5, 28.5);
ExtendedTreeItem treeRoot = new ExtendedTreeItem("Notes", true);
treeRoot.setGraphic(rootIcon);
treeRoot.setIsRoot(true);
setRoot(treeRoot);
this.setId("menubar_Notes");
this.setShowRoot(true);
this.setRoot(treeRoot);
this.setCellFactory(new Callback<TreeView<String>, TreeCell<String>>()
{
@Override
public TreeCell<String> call(TreeView<String> p)
{
return new TextFieldTreeCellImpl();
}
});
treeRoot.setIsRoot(true);
treeRoot.setExpanded(true);
}
/**
* TextFieldTreeCellImpl handles actions on TreeView items Core functions: -
* Right Click on Folder -> create Folder, add Note, delete, rename - Right
* Click on Note -> add Note, delete, rename
*
* @author Googles
* @credits Oracle TreeView
* Samples(http://docs.oracle.com/javafx/2/ui_controls
* /TreeViewSample.java.html)
*
*/
public final class TextFieldTreeCellImpl extends TreeCell<String>
{
private TextField textField;
private ContextMenu noteMenu = new ContextMenu();
private ContextMenu folderMenu = new ContextMenu();
@SuppressWarnings({ "rawtypes", "unchecked" })
public TextFieldTreeCellImpl()
{
// Initialize MenuItems
MenuItem addFolder = new MenuItem("Create Folder");
MenuItem addNote = new MenuItem("Create Note");
MenuItem delete = new MenuItem("Delete");
MenuItem rename = new MenuItem("Rename");
// Add MenuItem to dedicated ContextMenus
noteMenu.getItems().addAll(rename, delete);
folderMenu.getItems().addAll(addNote, addFolder, rename, delete);
// Set MenuItem actions
addNote.setOnAction(new EventHandler()
{
public void handle(Event t)
{
ExtendedTreeItem newNote = new ExtendedTreeItem("New Note", false);
getTreeItem().getChildren().add(newNote);
getTreeItem().setExpanded(true);
}
});
rename.setOnAction(new EventHandler()
{
@Override
public void handle(Event t)
{
startEdit();
}
});
}
/**
* Creates TextField on TreeCell Element to rename it
*/
@Override
public void startEdit()
{
if (!((ExtendedTreeItem) getTreeItem()).isRoot())
{
super.startEdit();
if (textField == null)
{
createTextField();
}
setText(null);
setGraphic(textField);
textField.selectAll();
}
}
/**
* Cancel Edit; obvious comment is obvious...
*/
@Override
public void cancelEdit()
{
super.cancelEdit();
setText((String) getItem());
setGraphic(getTreeItem().getGraphic());
}
/**
* Updates TreeCell to new name and attach ContextMenus to different
* TreeCells
*/
@Override
public void updateItem(String item, boolean empty)
{
super.updateItem(item, empty);
if (empty)
{
setText(null);
setGraphic(null);
}
else
{
if (isEditing())
{
if (textField != null)
{
textField.setText(getString());
}
setText(null);
setGraphic(textField);
}
else
{
setText(getString());
setGraphic(getTreeItem().getGraphic());
if (((ExtendedTreeItem) getTreeItem()).isDirectory())
{
setContextMenu(folderMenu);
}
else if (!((ExtendedTreeItem) getTreeItem()).isDirectory())
{
setContextMenu(noteMenu);
}
}
}
}
/**
* Initializes TextField and adds onClick actions to handle commit /
* cancel
*/
private void createTextField()
{
textField = new TextField(getString());
textField.setOnKeyReleased(new EventHandler<KeyEvent>()
{
@Override
public void handle(KeyEvent t)
{
if (t.getCode() == KeyCode.ENTER)
{
commitEdit(textField.getText());
}
else if (t.getCode() == KeyCode.ESCAPE)
{
cancelEdit();
}
}
});
}
private String getString()
{
return getItem() == null ? "" : getItem().toString();
}
}
}