Question

我想在tableview中添加一个上下文菜单，更具体地说，我想在右键单击表格行上显示上下文菜单。

我尝试使用此代码

 final EventHandler click = new EventHandler() {
           public void handle(MouseEvent t) {

           }

                @Override
                public void handle(Event arg0) {
                }
     };
            final Context menu = new ContextMenu();
     MenuItem item = new MenuItem("Add Image");
     item.setOnAction(new EventHandler() {
          public void handle(ActionEvent t) 
          {
           }
                @Override
                public void handle(Event arg0)
                {
                  //some code here   
          }});
     menu.getItems().addAll(item);
     EditingCell cellFactory = new EditingCell(click,menu); 
      TableColumn col = new TableColumn("column1");
     col.setCellFactory(cellFactory);

上面的代码在JAVAFX 2.0中正常工作，我正在右键单击上下文菜单，当我用JAVAFX 2.1运行代码时，上下文菜单无效。

我尝试使用showsProperty（）方法获取上下文菜单显示属性，它在JAVAFX 2.1中返回false，在JAVAFX 2.0中返回true

此外，我还尝试制作我的自定义cellfactory类，这是我的代码（我从官方的JAVAFX TreeView上下文菜单示例中获取）

import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.scene.control.*;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;

class TextFieldTreeCellImpl extends TableCell<String,String> {

    private TextField textField;
    private ContextMenu addMenu = new ContextMenu();

    public TextFieldTreeCellImpl() {
        MenuItem addMenuItem = new MenuItem("Add Employee");
        addMenu.getItems().add(addMenuItem);
        addMenuItem.setOnAction(new EventHandler() {
            public void handle(Event t) {

            }
        });
        setContextMenu(addMenu);
    }

    @Override
    public void startEdit() {
        super.startEdit();

        if (textField == null) {
            createTextField();
        }
        setText(null);
        setGraphic(textField);
        textField.selectAll();
    }

    @Override
    public void cancelEdit() {
        super.cancelEdit();

        setText((String) getItem());
        //setGraphic(getTableCell().getGraphic());
    }

    @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());



            }
        }
    }

    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();
    }
}

我将此自定义cellfactory添加为：

 final Callback<TableColumn, TableCell> cellFactory = 
new Callback<TableColumn, TableCell>() {
    public TableCell call(TableColumn p) {
        return new TextFieldTreeCellImpl();
}

};
col.setCellFactory(cellFactory);

在JAVAFX 2.0中仍然可以正常工作，但在JAVAFX 2.1中却没有。

请帮助我，我很难......

Answer 1

官方TreeView和TableView教程都适用于JavaFX 2.1。问题是，您正在混合这些代码示例。当TreeCell的单元格工厂需要TableColumn时，您无法返回TableCell。只需单独使用TableView教程，并将EditingCell替换为具有contextMenu的下一个：

import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.scene.control.ContextMenu;
import javafx.scene.control.MenuItem;
import javafx.scene.control.TableCell;
import javafx.scene.control.TextField;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;

class EditingCell extends TableCell<Person, String> {

    private TextField textField;
    private ContextMenu addMenu = new ContextMenu();

    public EditingCell() {
        MenuItem addMenuItem = new MenuItem("Print Me");
        addMenu.getItems().add(addMenuItem);
        addMenuItem.setOnAction(new EventHandler() {

            public void handle(Event t) {
                // Do something with current row
                Person curr = getTableView().getItems().get(getIndex());
                System.out.println(curr.getFirstName() + " " + curr.getLastName());
            }
        });
    }

    @Override
    public void startEdit() {
        super.startEdit();

        if (textField == null) {
            createTextField();
        }
        setText(null);
        setGraphic(textField);
        textField.selectAll();
    }

    @Override
    public void cancelEdit() {
        super.cancelEdit();
        setText((String) getItem());
        setGraphic(null);
    }

    @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(null);
                setContextMenu(addMenu);
            }
        }
    }

    private void createTextField() {

        textField = new TextField(getString());
        textField.setMinWidth(this.getWidth() - this.getGraphicTextGap() * 2);
        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();
    }
}

Answer 2

即使使用setContextMenu（）方法，我也没有得到任何响应。

然而，这就是我解决问题的方法

我刚刚注册了一个鼠标事件，并在指定位置（鼠标单击）显示了上下文菜单

this.setContextMenu(menu);
   this.getContextMenu().setAutoHide(true);

      EventHandler event = new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent me) {
    if (me.getButton() == MouseButton.SECONDARY) {
  tableView.getContextMenu().show(tableView, me.getSceneX(), me.getSceneY());
    }
 }
};    
      this.addEventHandler(MouseEvent.MOUSE_CLICKED,event);

TableView JAVAFX 2.1中的上下文菜单

2 个答案: