TableView JAVAFX 2.1中的上下文菜单

Question

我想在tableview中添加一个上下文菜单，更具体地说，我想在右键单击时在表行上显示上下文菜单。

我试着用这个代码

 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JavaFX2.0中工作正常，右键单击时我得到了一个上下文菜单，当我用JavaFX2.1上下文菜单运行我的代码时，它是如何工作的。

我尝试使用showingProperty（）方法获取上下文菜单的显示属性，它在JavaFX2.1中返回false，在JavaFX2.0中返回true

此外，我还尝试制作了自定义的cellfactory类，下面是我的代码（我从正式的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();
    }
}

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

};
col.setCellFactory(cellFactory);

Answer 1

官方的TreeView和TableView教程都可以很好地使用JavaFX2.1。问题是，您正在混合这些代码示例。当TableColumn的单元格工厂需要TableCell时，不能返回TreeCell。只需遵循TableView教程，并将EditingCell替换为以下具有ContextMenu的内容：

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();
    }
}