java - 如何使 ListView 可选择但不可编辑

Question

所以我正在编写一个 javafx 应用程序，我需要能够从 ListView 中选择单元格(用于复制粘贴目的)，但我不想让它可编辑，我的意思是，内容无法更改除非我想(例如，通过按钮允许它)。

所以我有以下代码:

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.scene.Scene;
import javafx.scene.control.ListView;
import javafx.scene.control.cell.TextFieldListCell;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        List<String> contacts = new ArrayList<>(Arrays.asList("968787522","3424234234","2343234324"));
        ListView<String> contactsList = new ListView();
        contactsList.setItems(FXCollections.observableArrayList(contacts));
        //this gives me the ability to edit the row as text field but I want this text field to not be editable
        contactsList.setCellFactory(TextFieldListCell.forListView());
        StackPane pane = new StackPane();
        pane.getChildren().add(contactsList);
        primaryStage.setScene(new Scene(pane, 300, 275));
        primaryStage.show();    }


    public static void main(String[] args) {
        launch(args);
    }
}

如果我将“contactsList”设置为不可编辑，我将无法编辑，也无法选择。

如您所见(下图)，我正在编辑单元格，但我希望能够选择文本(而不是项目)，但我不希望能够删除字符(可选择文本但不可编辑)。

Answer 1

因此，在经过大量研究和阅读 API 后，我想出了一个解决方案。这正是我想做的。如果有人需要，这里是演示 ;)所以这个想法是，每次我们想要选择一行的内容时，我们需要选择该行，获取 textField 并将编辑设置为 true 或 false，(每次)。因此，在我制作的演示中，我放置了一个按钮，以便您可以将编辑切换为 true 或 false，以确保它正在运行，以及运行情况如何。

干杯。

我评论了一些代码以便更好地理解，如果您对此有任何疑问，请告诉我。

package sample;

import com.sun.javafx.scene.control.skin.VirtualFlow;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.collections.FXCollections;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.control.cell.TextFieldListCell;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;


public class Main extends Application {
private boolean editable = false;

public static  IndexedCell getCell(final Control control, final int index) {
    return getVirtualFlow(control).getCell(index);
}

public static VirtualFlow<?> getVirtualFlow(Control control) {
    Group group = new Group();
    Scene scene = new Scene(group);
    Stage stage = new Stage();

    if(control.getScene() == null) {
        group.getChildren().setAll(control);
        stage.setScene(scene);
        stage.show();
    }

    VirtualFlow<?>flow = (VirtualFlow<?>) control.lookup("#virtual-flow");
    return flow;
}

public void setEditable(ListView contactsList){
        //this needs to be done since we need to run our code after the text field was rendered
        //so we need to invoke our code after this happens, if not it will throw a null pointer...
        Platform.runLater(() -> {
            //this is one of the most important guys because javafx api says that
            //TextFieldListCell.forListView() allows editing of the cell content when the cell is double-clicked,
            // or when {@link ListView#edit(int)} is called.
            int rowIndex = contactsList.getSelectionModel().getSelectedIndex();
            contactsList.edit(rowIndex);
            ListCell rootCell = (ListCell) getCell(contactsList, rowIndex);
            TextField textField = (TextField) rootCell.getGraphic();
            textField.setEditable(editable);
        });
}

@Override
public void start(Stage primaryStage) throws Exception{
    List<String> contacts = new ArrayList<>(Arrays.asList("968787522","3424234234","2343234324"));
    ListView<String> contactsList = new ListView();
    contactsList.setItems(FXCollections.observableArrayList(contacts));
    contactsList.setEditable(true);

    //this gives me the ability to edit the row as text field but I want this text field to not be editable
    contactsList.setCellFactory(TextFieldListCell.forListView());
    contactsList.setOnEditStart(e -> {
        setEditable(contactsList);
    });

    StackPane pane = new StackPane();
    Button editBtn = new Button("Toggle edit");
    editBtn.setOnAction(event -> {
        editable = !editable;
        editBtn.setText("Editing = " + editable);
        //to cancel any editing that might be occuring
        contactsList.getSelectionModel().clearSelection();
    });
    pane.getChildren().addAll(contactsList,editBtn);
    primaryStage.setScene(new Scene(pane, 300, 275));
    primaryStage.show();
}

public static void main(String[] args) {
    launch(args);
}
}