您好，这是我作为 Java 和 GUI 设计新手的第一个问题。 我遇到了一个奇怪的情况，我觉得我只是在看。 我有带有一些信息的 TableView，也可以使用添加按钮添加这些信息。删除按钮在我添加 FilterList 构造函数之前起作用，因此我可以按 ID 过滤搜索结果。添加该功能后，删除按钮停止工作。我个人认为 deleteButtonClicked 类不再正确检测表，因为通过添加过滤器功能进行了更改。但是，尽管我试图同时保留两者，但其中之一通常会停止工作。我目前正在尝试在没有 Delete Button 类的情况下使其工作，也许只是将产品设为 null。
TableView 函数位于代码的顶部，而删除按钮和函数位于代码底部。
package application;
import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.collections.transformation.FilteredList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableColumn.CellEditEvent;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.VBox;
import javafx.scene.text.Font;
import javafx.stage.Stage;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.control.cell.TextFieldTableCell;
import javafx.scene.layout.HBox;
import javafx.scene.text.FontWeight;
import javafx.scene.text.Text;
public class MainApp extends Application {
TableView<Product> table = new TableView<>();
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) throws Exception {
BorderPane root = new BorderPane();
BorderPane leftPane = new BorderPane();
FilteredList<Product> filterList = new FilteredList<>(productData);
table.setEditable(true);
//table.setItems(productData); // DELETE BUTTON WORKS WHEN THIS ONE IS ONLY SET
table.setItems(filterList); // DELETE BUTTON DOESN'T WORK WHEN
// THIS IS SET BUT, IS NEEDED TO FILTER SEARCH FUNCTIONS
TableColumn<Product, String> idNumberCol = new TableColumn<>("ID Number");
idNumberCol.setMinWidth(50);
idNumberCol.setCellValueFactory(new PropertyValueFactory<>("idNumber"));
idNumberCol.setCellFactory(TextFieldTableCell.<Product>forTableColumn());
idNumberCol.setOnEditCommit(
(CellEditEvent<Product, String> t) -> {
((Product) t.getTableView().getItems().get(
t.getTablePosition().getRow())
).setIdNumber(t.getNewValue());
});
TableColumn<Product, String> desCol = new TableColumn<>("Description");
desCol.setMinWidth(150);
desCol.setCellValueFactory(new PropertyValueFactory<>("description"));
desCol.setCellFactory(TextFieldTableCell.<Product>forTableColumn());
desCol.setOnEditCommit(
(CellEditEvent<Product, String> t) -> {
((Product) t.getTableView().getItems().get(
t.getTablePosition().getRow())
).setDescription(t.getNewValue());
});
TableColumn<Product, String> expCol = new TableColumn<>("Expiration");
expCol.setMinWidth(100);
expCol.setCellValueFactory(new PropertyValueFactory<>("expiration"));
expCol.setCellFactory(TextFieldTableCell.<Product>forTableColumn());
expCol.setOnEditCommit(
(CellEditEvent<Product, String> t) -> {
((Product) t.getTableView().getItems().get(
t.getTablePosition().getRow())
).setExpiration(t.getNewValue());
});
table.getColumns().addAll(idNumberCol, desCol, expCol);
VBox leftVbox = new VBox();
leftVbox.setPadding(new Insets(10, 20, 20, 20));
leftVbox.setSpacing(10);
leftVbox.getChildren().addAll(table);
BorderPane topPane = new BorderPane();
HBox topHbox = new HBox(); //Create HBox
topHbox.setPadding(new Insets(20, 20, 10, 20)); // Set padding and spacing for the hbox
topHbox.setSpacing(10); // The hbox will appropriately space out more
Text txtSearch = new Text("Search: ");
topHbox.getChildren().add(txtSearch);
txtSearch.setFont(Font.font("Tahoma", FontWeight.NORMAL, 16));
TextField txt = new TextField(""); // Create new TextField
txt.setPrefWidth(250);
txt.setPromptText("Search A Product ID"); // Sets up hint text inside the TextField
topHbox.getChildren().add(txt); // Add the TextField to the second hbox
HBox rightHbox = new HBox(); //Create HBox
rightHbox.setPadding(new Insets(20, 20, 10, 20)); // Set padding and spacing for the hbox
rightHbox.setSpacing(10); // The hbox will appropriately space out more
Text txtDetails = new Text("Product Details");
rightHbox.getChildren().add(txtDetails);
txtDetails.setFont(Font.font("Tahoma", FontWeight.NORMAL, 20));
txt.textProperty().addListener((obsVal, oldValue, newValue) -> {
filterList.setPredicate(product -> product.getIdNumber().contains(newValue));
});
BorderPane rightPane = new BorderPane();
VBox rightVbox = new VBox();
rightVbox.setPadding(new Insets(20, 10, 10, 20));
rightVbox.setSpacing(30);
rightVbox.setAlignment(Pos.TOP_LEFT);
Text txtId = new Text("ID: ");
rightVbox.getChildren().add(txtId);
txtId.setFont(Font.font("Tahoma", FontWeight.NORMAL, 16));
Text txtDes = new Text("Description: ");
rightVbox.getChildren().add(txtDes);
txtDes.setFont(Font.font("Tahoma", FontWeight.NORMAL, 16));
Text txtExp = new Text("Expiration: ");
rightVbox.getChildren().add(txtExp);
txtExp.setFont(Font.font("Tahoma", FontWeight.NORMAL, 16));
Text txtStatus = new Text("Status: ");
rightVbox.getChildren().add(txtStatus);
txtStatus.setFont(Font.font("Tahoma", FontWeight.NORMAL, 16));
Text txtEnter = new Text("Entered By: ");
rightVbox.getChildren().add(txtEnter);
txtEnter.setFont(Font.font("Tahoma", FontWeight.NORMAL, 16));
//EMPTY PLACE HOLDER INFORMATION TO POPULATE THE DATA
Label lblId;
Label lblDes;
Label lblExp;
Label lblStatus;
Label lblEnter;
HBox bottomHbox2 = new HBox();
bottomHbox2.setPadding(new Insets(20, 20, 20, 20));
bottomHbox2.setSpacing(10);
bottomHbox2.setAlignment(Pos.BOTTOM_RIGHT);
Button btnNew = new Button("Add...");
bottomHbox2.getChildren().add(btnNew);
btnNew.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
Stage secondStage = new Stage();
BorderPane dialogPane = new BorderPane();
VBox dialogVbox = new VBox();
dialogVbox.setPadding(new Insets(20, 10, 20, 20));
dialogVbox.setSpacing(20);
TextField addId = new TextField();
addId.setPromptText("ID Number");
addId.setMinWidth(50);
//addId.setMaxWidth(idNumberCol.getPrefWidth());
TextField addDes = new TextField();
addDes.setPromptText("Description");
addDes.setMinWidth(100);
//addDes.setMaxWidth(desCol.getPrefWidth());
TextField addExp = new TextField();
addExp.setPromptText("Expiration Date");
addExp.setMinWidth(50);
//addExp.setMaxWidth(expCol.getPrefWidth());
dialogVbox.getChildren().addAll(addId, addDes, addExp);
VBox dialogVbox2 = new VBox();
dialogVbox2.setPadding(new Insets(20, 20, 20, 10));
dialogVbox2.setSpacing(20);
Text txtIdLabel = new Text("ID: ");
dialogVbox2.getChildren().add(txtIdLabel);
txtIdLabel.setFont(Font.font("Tahoma", FontWeight.NORMAL, 16));
Text txtDesLabel = new Text("Description: ");
dialogVbox2.getChildren().add(txtDesLabel);
txtDesLabel.setFont(Font.font("Tahoma", FontWeight.NORMAL, 16));
Text txtExpLabel = new Text("Expiration: ");
dialogVbox2.getChildren().add(txtExpLabel);
txtExpLabel.setFont(Font.font("Tahoma", FontWeight.NORMAL, 16));
HBox addHbox = new HBox();
addHbox.setPadding(new Insets(20, 10, 50, 20));
addHbox.setSpacing(10);
addHbox.setAlignment(Pos.BOTTOM_RIGHT);
Button btnAdd = new Button("Add Product");
addHbox.getChildren().add(btnAdd);
btnAdd.setOnAction((ActionEvent e) -> {
productData.add(new Product(
addId.getText(),
addDes.getText(),
addExp.getText()));
addId.clear();
addDes.clear();
addExp.clear();
});
Button btnClose = new Button("Close");
addHbox.getChildren().add(btnClose);
btnClose.setOnAction(new EventHandler<ActionEvent>(){
@Override
public void handle(ActionEvent arg0) {
secondStage.close();
}
});
dialogPane.setCenter(dialogVbox);
dialogPane.setLeft(dialogVbox2);
dialogPane.setBottom(addHbox);
Scene scene2 = new Scene(dialogPane, 400, 200);
secondStage.setTitle("Add New Product");
secondStage.setScene(scene2);
secondStage.show();
//Set position of second window, related to primary window.
secondStage.setX(primaryStage.getX() + 250);
secondStage.setY(primaryStage.getY() + 100);
secondStage.show();
}
});
// DELETE BUTTON & EVENT HANDLER
Button btnDelete = new Button("Delete");
bottomHbox2.getChildren().add(btnDelete);
btnDelete.setOnAction(new EventHandler<ActionEvent>(){
@Override
public void handle(ActionEvent arg0) {
deleteButtonClicked();
}
});
Button btnSave = new Button("Save & Exit");
bottomHbox2.getChildren().add(btnSave);
btnSave.setOnAction(new EventHandler<ActionEvent>(){
@Override
public void handle(ActionEvent arg0) {
primaryStage.close();
}
});
rightVbox.getChildren().add(bottomHbox2);
topPane.setLeft(topHbox);
topPane.setCenter(rightHbox);
leftPane.setLeft(leftVbox);
rightPane.setLeft(rightVbox);
//rightPane.setCenter(bottomHbox2);
root.setTop(topPane);
root.setLeft(leftPane);
root.setCenter(rightPane);
Scene scene = new Scene(root, 650, 500);
primaryStage.setTitle("Perishables Application");
primaryStage.setScene(scene);
primaryStage.show();
}
// DELETE BUTTON FUNCTION
public void deleteButtonClicked() {
ObservableList<Product> productSelected, productData;
productData = table.getItems();
productSelected = table.getSelectionModel().getSelectedItems();
productSelected.forEach(productData::remove);
}
public ObservableList<Product> productData = FXCollections.observableArrayList(
new Product("001", "Cereal", "1/1/2017"),
new Product("002", "Dog Food", "3/3/2017"),
new Product("003", "Juice", "1/1/2018")
);
}
非常感谢任何建议。感谢阅读。
最佳答案
你有这个错误:
Exception in thread "JavaFX Application Thread" java.lang.UnsupportedOperationException at java.util.AbstractList.remove(AbstractList.java:161) at java.util.AbstractList$Itr.remove(AbstractList.java:374) at java.util.AbstractCollection.remove(AbstractCollection.java:293) at application.MainApp.deleteButtonClicked(MainApp.java:297) at application.MainApp$2.handle(MainApp.java:255) at application.MainApp$2.handle(MainApp.java:1)
尝试替换 productSelected.forEach(productData::remove);与:
productSelected.forEach(this.productData::remove);
|
提及您要从 ObservableList 中删除数据不是 FilteredList ，当从 ObservableList 中删除它们时它将自动从 FilteredList<Product> 中删除
如果你想用最少的代码编写你的方法:
// DELETE BUTTON FUNCTION
public void deleteButtonClicked() {
table.getSelectionModel().getSelectedItems().forEach(this.productData::remove);
}
关于JavaFX GUI - 为什么删除按钮功能不适用于 TableView？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40901292/