我在与两个控制器通信时遇到问题。
其中之一是MainPanelController,第二个是AddUserController。
在AddUserController中单击UserNameOkButton之后,我想在mainControl.getTopPanelController()。getUserSplitMenuButton()中创建新项目。
但是我在这方面有错误。
package simplygoals.control;
import simplygoals.model.*;
import simplygoals.control.AddUserController;
import java.util.ArrayList;
import javafx.scene.control.MenuItem;
import java.net.URL;
import java.sql.SQLException;
import java.util.ResourceBundle;
import simplygoals.model.MySQLAccess;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.SplitMenuButton;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Modality;
import javafx.stage.Stage;
import javafx.stage.StageStyle;
public class MainPanelController extends MainController implements Initializable {
@FXML
private AddUserController addUserController;
@FXML
private TopPanelController topPanelController;
@FXML
private MenuPanelController menuPanelController;
@FXML
private LeftPanelTimeModeController leftPanelTimeModeController;
@FXML
private CenterPanelTableController centerPanelTableController;
@Override
public void initialize(URL location, ResourceBundle resources) {
//if there is no database create it, otherwise not
getAppModel().getMySQL().createDatabase();
getAppModel().copyUsersfromMySqlToAllUsers();
createNewUserTopPanel();
showUsersTopPanel();
}
public void showUsersTopPanel(){
SplitMenuButton splitMenuButton = getTopPanelController().getUserSplitMenuButton();
for(String t:getAppModel().getAllUsers().getUsersString()){
final MenuItem menuItem = new MenuItem(t);
menuItem.setText(t);
splitMenuButton.getItems().add(menuItem);
}
}
public void createNewUserTopPanel(){
MenuItem menuItem = getTopPanelController().getUserSplitMenuItem();
menuItem.setOnAction(new EventHandler<ActionEvent>(){
public void handle(ActionEvent event) {
try {
FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("/simplygoals/view/AddUser.fxml"));
Parent root1 = (Parent) fxmlLoader.load();
Stage stage = new Stage();
stage.setScene(new Scene(root1));
stage.show();
} catch(Exception e) {
e.printStackTrace();
}
}
});
}
public TopPanelController getTopPanelController() {
return topPanelController;
}
}
还有第二个控制器:
package simplygoals.control;
import java.net.URL;
import javafx.fxml.Initializable;
import java.util.ResourceBundle;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.MenuItem;
import javafx.scene.control.SplitMenuButton;
import javafx.scene.control.TextField;
import javafx.scene.layout.AnchorPane;
import simplygoals.control.MainPanelController;
public class AddUserController extends MainController implements Initializable {
private MainPanelController mainControl;
@FXML
private Button UserNameOkButton;
@FXML
private AnchorPane AddUserAnchor;
@FXML
private TextField UserNameTextField;
@Override
public void initialize(URL arg0, ResourceBundle arg1) {
UserNameOkButton.setOnAction(x->{
getAppModel().addNewUserToMySql(UserNameTextField.getText());
getAppModel().copyUsersfromMySqlToAllUsers();
SplitMenuButton splitMenuButton = mainControl.getTopPanelController().getUserSplitMenuButton();
splitMenuButton.getItems().clear();
for(String t:getAppModel().getAllUsers().getUsersString()){
final MenuItem menuItem = new MenuItem(t);
menuItem.setText(t);
splitMenuButton.getItems().add(menuItem);
}
});
}
AddUserController是新窗口中的控制器。那里我有一个文本框和确定按钮。单击此菜单后,我想在menusplitbutton中创建新项,但是我必须使用MainPanelController。
如何在不同的窗口中通信两个控制器?
感谢帮助。
这里有错误:
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
at simplygoals.control.AddUserController.lambda$0(AddUserController.java:30)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Node.fireEvent(Node.java:8411)
at javafx.scene.control.Button.fire(Button.java:185)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:380)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:294)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:416)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:415)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
at java.lang.Thread.run(Unknown Source)
最佳答案
您尚未在任何地方初始化mainControl
。
在setMainControl()
中定义一个AddUserController
方法以对其进行初始化,并在加载AddUser.fxml
时调用它:
menuItem.setOnAction(event -> {
try {
FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("/simplygoals/view/AddUser.fxml"));
Parent root1 = (Parent) fxmlLoader.load();
Stage stage = new Stage();
stage.setScene(new Scene(root1));
AddUserController addUserController = fxmlLoader.getController();
addUserController.setMainControl(this);
stage.show();
} catch(Exception e) {
e.printStackTrace();
}
});