我正在用Java设计一个简单的电子邮件客户端。我使用两个FXML文件作为视图，当然还有2个Java控制器，每个都用于右视图。
我的目标是关闭WriteView选项卡，点击按钮＆＃34;删除＆＃34;在Writeview中，但我遇到了一些问题，因为我创建了新的选项卡，我在其中加载了MainVIewController中的WriteView，现在我没有任何id或类型的引用来关闭选项卡，除非＆＃34; x＆＃34;选项卡名称旁边的按钮。
以下是代码：
MainView.FXML
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.control.cell.*?>
<?import javafx.collections.*?>
<TabPane fx:id="root" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" tabClosingPolicy="ALL_TABS" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="controller.MainViewController">
<tabs>
<Tab text="Mailbox" closable="false">
<content>
<BorderPane prefHeight="200.0" prefWidth="200.0">
<top>
<ToolBar prefHeight="40.0" prefWidth="200.0" BorderPane.alignment="CENTER">
<items>
<Button fx:id="update" mnemonicParsing="false" onAction="#updateButton" text="Update" />
<Button fx:id="write" mnemonicParsing="false" onAction="#writeButton" text="Write" />
<Button fx:id="reply" mnemonicParsing="false" onAction="#replyButton" text="Reply" />
<Button fx:id="replyToAll" mnemonicParsing="false" onAction="#replyToAllButton" text="Reply to All" />
<Button fx:id="forward" mnemonicParsing="false" onAction="#forwardButton" text="Forward" />
<Button fx:id="delete" mnemonicParsing="false" onAction="#deleteButton" text="Delete" />
</items>
</ToolBar>
</top>
<bottom>
<HBox prefHeight="19.0" prefWidth="600.0" BorderPane.alignment="CENTER">
<children>
<Label text="Client Status:" />
<Label fx:id="status" text="" />
</children>
</HBox>
</bottom>
<left>
<Accordion BorderPane.alignment="CENTER">
<panes>
<TitledPane fx:id="mailboxName" animated="false" text="Inbox: ">
<content>
<VBox prefHeight="200.0" prefWidth="100.0">
<children>
<Label fx:id="inbox" text="Inbox" />
<Label fx:id="drafts" text="Drafts" />
<Label fx:id="bin" text="Bin" />
</children>
</VBox>
</content>
</TitledPane>
</panes>
</Accordion>
</left>
<center>
<TableView fx:id="table" prefHeight="200.0" prefWidth="200.0" BorderPane.alignment="CENTER">
<columns>
<TableColumn prefWidth="247.0" text="Subject">
<cellValueFactory><PropertyValueFactory property="subject" /></cellValueFactory>
</TableColumn>
<TableColumn prefWidth="131.0" text="From">
<cellValueFactory><PropertyValueFactory property="receiver" /></cellValueFactory>
</TableColumn>
<TableColumn minWidth="3.0" prefWidth="118.0" text="Date">
<cellValueFactory><PropertyValueFactory property="date" /></cellValueFactory>
</TableColumn>
</columns>
<items>
<FXCollections fx:factory="observableArrayList">
</FXCollections>
</items>
</TableView>
</center>
</BorderPane>
</content>
</Tab>
</tabs>
</TabPane>
MainViewController.java：
package controller;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.control.*;
import model.Account;
import model.Email;
import java.io.IOException;
import java.net.URL;
import java.util.Observable;
import java.util.Observer;
import java.util.ResourceBundle;
public class MainViewController implements Initializable, Observer {
// utility https://stackoverflow.com/questions/40557492/mvc-with-javafx-and-fxml
// we will follow method 1
public MainViewController() {}
@FXML // MainView components
public TabPane root;
public Button update;
public Button write;
public Button reply;
public Button replyToAll;
public Button forward;
public Button delete;
public Label status;
public TitledPane mailboxName;
public Label inbox;
public Label drafts;
public Label bin;
public TableView<Email> table;
// BUTTONS ---------------------------------------------------------------------------------------------------------
/**
* On click on Update button do something
*/
@FXML
public void updateButton() {
update.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent e) {
String mess = "You clicked: " + e.getSource() + "!";
System.out.println(mess);
status.setText(mess);
}
});
}
/**
* On click on Write button do something
*/
@FXML
public void writeButton() {
write.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent e) {
String mess = "You clicked: " + e.getSource() + "!";
System.out.println(mess);
onWriteClick();
}
});
}
/**
* On click on Reply button do something
*/
@FXML
public void replyButton() {
reply.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent e) {
String mess = "You clicked: " + e.getSource() + "!";
System.out.println(mess);
}
});
}
/**
* On click on Reply To All button do something
*/
@FXML
public void replyToAllButton() {
replyToAll.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent e) {
String mess = "You clicked: " + e.getSource() + "!";
System.out.println(mess);
}
});
}
/**
* On click on Forward button do something
*/
@FXML
public void forwardButton() {
forward.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent e) {
String mess = "You clicked: " + e.getSource() + "!";
System.out.println(mess);
}
});
}
/**
* On click on Delete label do something
*/
@FXML
public void deleteButton() {
delete.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent e) {
String mess = "You clicked: " + e.getSource() + "!";
System.out.println(mess);
}
});
}
/**
* Sets the name of the account in the MainView
*/
@FXML
public void setMailboxName() {
}
// TODO: implementare lo stato nelle email, perche così possiamo discriminare se sono inbox, bin, drafts
/**
* On click on Inbox label do something
*/
@FXML
public void inboxLabel() {
}
/**
* On click on Drafts label do something
*/
@FXML
public void draftsLabel() {
}
/**
* On click on Bin label do something
*/
@FXML
public void binLabel() {
}
// INITIALIZING ----------------------------------------------------------------------------------------------------
/**
* It initialize all the event of the buttons
*/
private void initializeButtons(){
updateButton();
writeButton();
replyButton();
replyToAllButton();
forwardButton();
deleteButton();
}
/**
* It calls all the methods that initialize a category of components
*/
private void initializeAll() {
initializeButtons();
loadEmails();
}
// IMPLEMENTATIONS -------------------------------------------------------------------------------------------------
/**
* It initialize all the necessary for the GUI
* @param location: The location used to resolve relative paths for the root object, or null if the location is not known.
* @param resources: The resources used to localize the root object, or null if the root object was not localized.
*/
@Override
public void initialize(URL location, ResourceBundle resources) {
initializeAll();
System.out.println("GUI Loaded"); // DEBUG
}
/**
* Implementation of update method in Observer interface
* @param o: the observable object.
* @param arg: (optional) an argument passed to the notifyObservers method.
*/
@Override
public void update(Observable o, Object arg) {
}
// ON CLICK --------------------------------------------------------------------------------------------------------
/**
* It opens a new Tab with WriteView loaded. It is used to write a new email.
*/
private void onWriteClick(){
try{
Tab tab = new Tab("Write");
tab.setContent(FXMLLoader.load(getClass().getResource("/view/WriteView.fxml"))); // load the GUI for the Write tab
tab.setId("writeroot");
root.getTabs().add(tab); // Add the new tab beside the "Inbox" tab
root.getSelectionModel().select(tab); // Switch to Write tab
} catch (IOException e) {
e.printStackTrace();
}
}
// POPULATING MAIN VIEW --------------------------------------------------------------------------------------------
/**
* It populates the main view with all the email with a specific status
*/
private void loadEmails() {
}
} // end class
WriteView.fxml：
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.text.*?>
<?import java.lang.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<VBox fx:id="root" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="controller.WriteViewController">
<children>
<GridPane fx:id="table">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" maxWidth="296.0" minWidth="10.0" prefWidth="57.0" />
<ColumnConstraints hgrow="SOMETIMES" maxWidth="543.0" minWidth="10.0" prefWidth="543.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<Label text="To:" />
<Label text="From:" GridPane.rowIndex="1" />
<Label text="Subject:" GridPane.rowIndex="2" />
<TextField fx:id="to" GridPane.columnIndex="1" />
<TextField fx:id="from" GridPane.columnIndex="1" GridPane.rowIndex="1" />
<TextField fx:id="subject" GridPane.columnIndex="1" GridPane.rowIndex="2" />
</children>
</GridPane>
<Pane prefHeight="272.0" prefWidth="600.0">
<children>
<TextArea fx:id="text" prefHeight="277.0" prefWidth="600.0" />
</children>
</Pane>
<ToolBar fx:id="toolbar" nodeOrientation="RIGHT_TO_LEFT" prefHeight="40.0" prefWidth="200.0">
<items>
<Button fx:id="send" mnemonicParsing="false" onAction="#sendButton" text="Send" />
<Button fx:id="saveAsDraft" mnemonicParsing="false" onAction="#saveButton" text="Save as draft" />
<Button fx:id="delete" mnemonicParsing="false" onAction="#deleteButton" text="Delete" />
</items>
</ToolBar>
</children>
</VBox>
WriteViewController.java：
package controller;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.*;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.VBox;
import model.Account;
import model.Email;
import java.net.URL;
import java.util.Observable;
import java.util.Observer;
import java.util.ResourceBundle;
public class WriteViewController implements Initializable, Observer{
public WriteViewController() {
}
@FXML
public VBox root;
public GridPane table;
public TextField to;
public TextField from;
public TextField subject;
public TextArea text;
public ToolBar toolbar;
public Button send;
public Button saveAsDraft;
public Button delete;
// BUTTONS ---------------------------------------------------------------------------------------------------------
/**
* On click on Update button do something
*/
@FXML
public void sendButton() {
send.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
Account reciver = new Account(to.getText());
Account sender = new Account(from.getText());
Email toSend = new Email(sender, reciver, subject.getText(), text.getText());
toSend.writeEmail(reciver, subject.getText(), text.getText());
// Is not necessary to set the state, because, when a new Email is created, it has already the
// state of new (2). For further information, see Email constructor.
}
});
}
@FXML
public void saveButton() {
saveAsDraft.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
Account reciver = new Account(to.getText());
Account sender = new Account(from.getText());
Email toSend = new Email(sender, reciver, subject.getText(), text.getText());
toSend.setState(0); // the email is a draft
}
});
}
@FXML
public void deleteButton() {
delete.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
Account reciver = new Account(to.getText());
Account sender = new Account(from.getText());
Email toSend = new Email(sender, reciver, subject.getText(), text.getText());
// here is the problem, Goal: close this tab!
System.out.println(root.getParent()); // DEBUG
}
});
}
// INITIALIZING ----------------------------------------------------------------------------------------------------
/**
* It initialize all the event of the buttons
*/
private void initializeButtons(){
sendButton();
saveButton();
deleteButton();
}
/**
* It call all the methods that initialize a category of components
*/
private void initializeAll() {
initializeButtons();
}
// IMPLEMENTATIONS -------------------------------------------------------------------------------------------------
/**
* It initialize all the necessary for the GUI
* @param location: The location used to resolve relative paths for the root object, or null if the location is not known.
* @param resources: The resources used to localize the root object, or null if the root object was not localized.
*/
@Override
public void initialize(URL location, ResourceBundle resources) {
initializeAll();
}
/**
* Implementation of update method in Observer interface
* @param o: the observable object.
* @param arg: (optional) an argument passed to the notifyObservers method.
*/
@Override
public void update(Observable o, Object arg) {
}
}
Client.java：
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
import java.io.IOException;
/**
*
* @author lorenzotabasso
*/
public class Client extends Application{
@Override
public void start(Stage primaryStage) throws IOException{
Parent root = FXMLLoader.load(getClass().getResource("view/MainView.fxml"));
Scene scene = new Scene(root);
primaryStage.setScene(scene);
primaryStage.show();
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}
答案 0 :(得分：1)
您可以将事件处理程序传递给单击删除按钮时触发的控制器：
private Runnable tabCloseHandler;
public void setTabCloseHandler(Runnable handler) {
tabCloseHandler = handler;
}
@FXML
public void deleteButton(ActionEvent e) {
// you don't set the handler here; this method is invoked as handler
String mess = "You clicked: " + e.getSource() + "!";
System.out.println(mess);
if (handler != null) {
handler.run();
}
}
final Tab tab = new Tab("Write");
FXMLLoader loader = new FXMLLoader(getClass().getResource("/view/WriteView.fxml"));
tab.setContent(loader.load());
loader.<WriteViewController>getController().setTabCloseHandler(() -> root.getTabs().remove(tab));
或者，您可以迭代到场景的根目录，并在找到TabPane后立即关闭显示的标签
public static TabPane findEnclosingTabPane(Node n) {
while (n != null && !(n instanceof TabPane)) {
n = n.getParent();
}
return (TabPane) n;
}
TabPane tabPane = findEnclosingTabPane(root);
tabPane.getTabs().remove(tabPane.getSelectionModel().getSelectedItem());