如何使上下文菜单在javaFX中的树视图上工作? [英] How to make a context menu work on a treeview in javaFX?
问题描述
我想在TreeView项上有一个上下文菜单. 我期望事件处理程序的ActionEvent为我提供有关单击哪个TreeView项的信息,但是我只是发现getSource和getTarget返回一个Menu Item.如何找出已单击哪个TreeView项?我可以在单独的选项卡中有多个treevIews.
I want to have a context menu on a TreeView item. I am expecting that the ActionEvent of the event handler gives me information about which TreeView item is clicked, but I just find that getSource and getTarget return a Menu Item. How can I find out which TreeView Item has been clicked? I can have multiple treevIews in separate Tabs.
FileContextMenu cm = new FileContextMenu(new EventHandler<ActionEvent>() {
public void handle(ActionEvent e) {
System.out.println("Open File");
//MenuItem mi = (MenuItem)e.getSource();
EventTarget et = e.getTarget();
//File editorFile = new File(mi.getId());
System.out.println(et);
//mainWindowController.openEditor(editorFile);
}
}, new EventHandler<ActionEvent>() {
public void handle(ActionEvent e) {
System.out.println("Create Project From Template");
}
});
这叫做
public class FileContextMenu extends ContextMenu
{
public FileContextMenu(EventHandler<ActionEvent> ehOpenFile,
EventHandler<ActionEvent> ehProjectFromTemplate)
{
MenuItem item1 = new MenuItem("Open File");
item1.setOnAction(ehOpenFile);
MenuItem item2 = new MenuItem("Create Project From Template");
item2.setOnAction(ehProjectFromTemplate);
this.getItems().addAll(item1, item2);
}
}
我在这里附上菜单:
private void addFilesTab(FXMLLoader loader, String sRoot, ContextMenu cm) throws IOException
{
AnchorPane fileView = loader.load();
FileViewController fileViewController = loader.getController();
FileShort fsRoot = new FileShort(sRoot);
if(fsRoot.exists()) {
fileViewController.setRootFolder(fsRoot);
fileViewController.setContextMenu(cm);
ObservableList<Tab> tabs = navigationTabPane.getTabs();
tabs.add(new Tab(sRoot));
// Connect the FileView with last tab of the Navigation TabPane.
tabs.get(tabs.size()-1).setContent(fileView);
}
}
这叫做
public void setContextMenu(ContextMenu cm)
{
fileTreeView.setContextMenu(cm);
}
我现在尝试使用cellfactory,但是我不了解如何使用p参数来查找cell值.我的代码是:
I now try to use a cellfactory, but I don't understand how to use the p parameter to find a cells value . My code for this is:
this.fileTreeView.setCellFactory(new Callback<TreeView<FileShort>,TreeCell<FileShort>>(){
@Override
public TreeCell<FileShort> call(TreeView<FileShort> p) {
TreeCell<FileShort> cell = new TreeCell<FileShort>();
cell.setContextMenu(cm);
return cell;
}
});
推荐答案
您必须为每个单元格创建一个不同的上下文菜单:
You have to create a different context menu for each cell:
this.fileTreeView.setCellFactory(new Callback<TreeView<FileShort>,TreeCell<FileShort>>(){
@Override
public TreeCell<FileShort> call(TreeView<FileShort> p) {
TreeCell<FileShort> cell = new TreeCell<FileShort>() {
@Override
protected void updateItem(FileShort file, boolean empty) {
super.updateItem(file, empty);
if (empty) {
setText(null);
} else {
// maybe use a more appropriate string for display here
// e.g. if you were using a regular java.io.File you would
// likely want file.getName()
setText(file.toString());
}
}
};
ContextMenu cm = createContextMenu(cell);
cell.setContextMenu(cm);
return cell;
}
});
private ContextMenu createContextMenu(TreeCell<FileShort> cell) {
ContextMenu cm = new ContextMenu();
MenuItem openItem = new MenuItem("Open File");
openItem.setOnAction(event -> {
FileShort file = cell.getItem();
if (file != null) {
// open the file...
}
});
cm.getItems().add(openItem);
// other menu items...
return cm ;
}
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