我正在制作一个MenuBar,而且我无法按下菜单的功能：“File”,然后执行一个动作.就像打开一个其他的fxml,或者是一些写出一些输出的例子.
我想要一个MenuItem(在“About”)的功能,如“File”菜单.
package model;
import static java.lang.System.out;
import javafx.application.Application;
import javafx.beans.property.ReadOnlyDoubleProperty;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.geometry.Side;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyCodeCombination;
import javafx.scene.input.KeyCombination;
import javafx.scene.layout.borderpane;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
/**
* Example of creating menus in JavaFX.
*
* @author Dustin
*/
public class JavaFxMenus extends Application
{
/**
* Build menu bar with included menus for this demonstration.
*
* @param menuWidthProperty Width to be bound to menu bar width.
* @return Menu Bar with menus included.
*/
private MenuBar buildMenuBarWithMenus(final ReadOnlyDoubleProperty menuWidthProperty)
{
final MenuBar menuBar = new MenuBar();
// Prepare left-most 'File' drop-down menu
final Menu fileMenu = new Menu("File");
menuBar.getMenus().add(fileMenu);
//menuBar.getonMouseClicked().handle(this);
// Prepare 'Examples' drop-down menu
final Menu examplesMenu = new Menu("JavaFX 2.0 Examples");
examplesMenu.getItems().add(new MenuItem("Text Example"));
examplesMenu.getItems().add(new MenuItem("Objects Example"));
examplesMenu.getItems().add(new MenuItem("Animation Example"));
menuBar.getMenus().add(examplesMenu);
// Prepare 'Help' drop-down menu
final Menu helpMenu = new Menu("Help");
helpMenu.setonAction(null);
final MenuItem searchMenuItem = new MenuItem("Search");
searchMenuItem.setdisable(true);
helpMenu.getItems().add(searchMenuItem);
final MenuItem onlineManualMenuItem = new MenuItem("Online Manual");
onlineManualMenuItem.setVisible(false);
helpMenu.getItems().add(onlineManualMenuItem);
helpMenu.getItems().add(new SeparatorMenuItem());
final MenuItem aboutMenuItem =
MenuItemBuilder.create()
.text("About")
.onAction(
new EventHandler<ActionEvent>()
{
@Override public void handle(ActionEvent e)
{
out.println("You clicked on About!");
}
})
.accelerator(
new KeyCodeCombination(
KeyCode.A,KeyCombination.CONTROL_DOWN))
.build();
helpMenu.getItems().add(aboutMenuItem);
menuBar.getMenus().add(helpMenu);
// bind width of menu bar to width of associated stage
menuBar.prefWidthproperty().bind(menuWidthProperty);
return menuBar;
}
/**
* Start of JavaFX application demonstrating menu support.
*
* @param stage Primary stage.
*/
@Override
public void start(final Stage stage)
{
stage.setTitle("Creating Menus with JavaFX 2.0");
final Group rootGroup = new Group();
final Scene scene = new Scene(rootGroup,800,400,Color.WHEAT);
final MenuBar menuBar = buildMenuBarWithMenus(stage.widthproperty());
rootGroup.getChildren().add(menuBar);
stage.setScene(scene);
stage.show();
}
/**
* Main executable function for running examples.
*
* @param arguments Command-line arguments: none expected.
*/
public static void main(final String[] arguments)
{
Application.launch(arguments);
}
}
解决方法
AFAIK,A菜单,如果没有任何添加子菜单或Menuitems,则不会在点击,显示或隐藏上触发事件.但是,解决方法是设置其图形,其中该图形节点将处理鼠标点击,例如,
Label menuLabel = new Label("File");
menuLabel.setonMouseClicked(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
Stage myDialog = new Stage();
myDialog.initModality(Modality.WINDOW_MODAL);
Scene myDialogScene = new Scene(VBoxBuilder.create()
.children(new Text("Hello! it's My Dialog."))
.alignment(Pos.CENTER)
.padding(new Insets(10))
.build());
myDialog.setScene(myDialogScene);
myDialog.show();
}
});
Menu fileMenuButton = new Menu();
fileMenuButton.setGraphic(menuLabel);
menuBar.getMenus().add(fileMenuButton);
这种方法的一个缺点是标签不覆盖菜单的所有空格,从而点击菜单边缘不会触发鼠标事件.通过取消注释menuLabel.setStyle行,看到这一点.但是,这可以通过使用我认为的CSS样式来解决.
代码部分取自Create Dialog using Stage.您还可以使用FXMLLoader将FXML文件加载到myDialog阶段.网上有很多例子.