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java - Javafx右键编辑listView项及类似方法

问题描述

我正在构建一个 JavaFX 待办事项列表，但不确定如何继续。右键单击弹出菜单工作正常，但我不知道如何编辑/更改其他内容，ListView而不仅仅是删除它们。

LocalEvent e = a string somehow?

我试图在 Javafx 的右键弹出菜单中做 4 件事：

  1. 完成的是在项目旁边放置一个复选标记并删除该项目。
  2. Nest 是从列表项创建嵌套列表（完全不知道如何）。
  3. 编辑是使列表项可编辑并保存更改。
  4. 删除作品:)

我通过将以下内容添加到 fxml 文件来完成此操作：

<JFXListView fx:id="eventList" editable="true" layoutX="24.0" layoutY="106.0" prefHeight="354.0" prefWidth="939.0">

<contextMenu>
        <ContextMenu>
          <items>
            <MenuItem fx:id="popUp" mnemonicParsing="false" onAction="#Done" text="Done" />
              <MenuItem fx:id="popUp3" mnemonicParsing="false" onAction="#Remove" text="Remove" />
              <MenuItem fx:id="popUp1" mnemonicParsing="false" onAction="#Nest" text="Nest" />
              <MenuItem fx:id="popUp2" mnemonicParsing="false" onAction="#Edit" text="Edit" />
          </items>
        </ContextMenu>
     </contextMenu></JFXListView>`

这是我的 Controller.java 文件：

package application;

import java.net.URL;
import java.time.LocalDate;
import java.util.ResourceBundle;

import com.jfoenix.controls.JFXButton;
import com.jfoenix.controls.JFXListView;
import com.jfoenix.controls.JFXTextField;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.DatePicker;
import javafx.scene.control.MenuItem;
import javafx.scene.input.MouseEvent;

public class Controller implements Initializable{

    @Override
    public void initialize(URL url, ResourceBundle rb) {
        datePicker.setValue(LocalDate.now());
        eventList.setExpanded(true);
        eventList.depthProperty().set(1);   
    }

    @FXML
    private MenuItem popUp;

    @FXML
    private JFXTextField textBox;

    @FXML
    private JFXListView<LocalEvent> eventList;
    ObservableList<LocalEvent> list = FXCollections.observableArrayList();

    @FXML
    private JFXButton AddButton;

    @FXML
    private DatePicker datePicker;


    @FXML
    void Submit(ActionEvent event) {
        list.add(new LocalEvent(datePicker.getValue(), textBox.getText()));
        eventList.setItems(list);
        datePicker.setValue(LocalDate.now());
        textBox.setText("");

    }

    @FXML
    public void onEnter(ActionEvent event){
        list.add(new LocalEvent(datePicker.getValue(), textBox.getText()));
        eventList.setItems(list);
        datePicker.setValue(LocalDate.now());
        textBox.setText("");    
    }

    @FXML
    void Done(ActionEvent event) {
        int index = eventList.getSelectionModel().getSelectedIndex();
        String str = list.get(index).toString();
        str = "[✓] " +  str;
        LocalEvent e = null;    // <- how to put a string in here?
        list.set(index, e);
        eventList.setItems(list);
        //eventList.setItems(list.set(index, element));
    }

    @FXML 
    void Remove(ActionEvent event) {
        // remove selected task
        list.remove(eventList.getSelectionModel().getSelectedIndex());
    }

    @FXML
    void Nest(ActionEvent event) {
        System.out.println("How the hell do I do that? lol");
        // check for nested level
        // create a nested list item

    }

    @FXML
    void Edit(ActionEvent e) {
        System.out.println("Edit selection");
        eventList.setEditable(true);
        int index = eventList.getSelectionModel().getSelectedIndex(); 
        eventList.scrollTo(index);
        eventList.layout();
        eventList.edit(index); 
        eventList.layout();
    }
}

LocalEvent是一个java类文件如下：

package application;

import java.time.LocalDate;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;

import javafx.beans.InvalidationListener;
import javafx.collections.ListChangeListener;
import javafx.collections.ObservableList;

public class LocalEvent implements ObservableList<LocalEvent> {
    private String description;
    private LocalDate date;

    public String getDescription() {
        return description;
    }
    public void setDescription(String description) {
        this.description = description;
    }
    public LocalDate getDate() {
        return date;
    }
    public void setDate(LocalDate date) {
        this.date = date;
    }

    public LocalEvent(LocalDate date, String description) {
        this.setDate(date);
        this.setDescription(description);
    }

    @Override
    public String toString() {
        return "At " + this.getDate() + ": " + this.getDescription();
    }
    @Override
    public int size() {
        // TODO Auto-generated method stub
        return 0;
    }
    @Override
    public boolean isEmpty() {
        // TODO Auto-generated method stub
        return false;
    }
    @Override
    public boolean contains(Object o) {
        // TODO Auto-generated method stub
        return false;
    }
    @Override
    public Iterator<LocalEvent> iterator() {
        // TODO Auto-generated method stub
        return null;
    }
    @Override
    public Object[] toArray() {
        // TODO Auto-generated method stub
        return null;
    }
    @Override
    public <T> T[] toArray(T[] a) {
        // TODO Auto-generated method stub
        return null;
    }
    @Override
    public boolean add(LocalEvent e) {
        // TODO Auto-generated method stub
        return false;
    }
    @Override
    public boolean remove(Object o) {
        // TODO Auto-generated method stub
        return false;
    }
    @Override
    public boolean containsAll(Collection<?> c) {
        // TODO Auto-generated method stub
        return false;
    }
    @Override
    public boolean addAll(Collection<? extends LocalEvent> c) {
        // TODO Auto-generated method stub
        return false;
    }
    @Override
    public boolean addAll(int index, Collection<? extends LocalEvent> c) {
        // TODO Auto-generated method stub
        return false;
    }
    @Override
    public boolean removeAll(Collection<?> c) {
        // TODO Auto-generated method stub
        return false;
    }
    @Override
    public boolean retainAll(Collection<?> c) {
        // TODO Auto-generated method stub
        return false;
    }
    @Override
    public void clear() {
        // TODO Auto-generated method stub

    }
    @Override
    public LocalEvent get(int index) {
        // TODO Auto-generated method stub
        return null;
    }
    @Override
    public LocalEvent set(int index, LocalEvent element) {
        // TODO Auto-generated method stub
        return null;
    }
    @Override
    public void add(int index, LocalEvent element) {
        // TODO Auto-generated method stub

    }
    @Override
    public LocalEvent remove(int index) {
        // TODO Auto-generated method stub
        return null;
    }
    @Override
    public int indexOf(Object o) {
        // TODO Auto-generated method stub
        return 0;
    }
    @Override
    public int lastIndexOf(Object o) {
        // TODO Auto-generated method stub
        return 0;
    }
    @Override
    public ListIterator<LocalEvent> listIterator() {
        // TODO Auto-generated method stub
        return null;
    }
    @Override
    public ListIterator<LocalEvent> listIterator(int index) {
        // TODO Auto-generated method stub
        return null;
    }
    @Override
    public List<LocalEvent> subList(int fromIndex, int toIndex) {
        // TODO Auto-generated method stub
        return null;
    }
    @Override
    public void addListener(InvalidationListener listener) {
        // TODO Auto-generated method stub

    }
    @Override
    public void removeListener(InvalidationListener listener) {
        // TODO Auto-generated method stub

    }
    @Override
    public void addListener(ListChangeListener<? super LocalEvent> listener) {
        // TODO Auto-generated method stub

    }
    @Override
    public void removeListener(ListChangeListener<? super LocalEvent> listener) {
        // TODO Auto-generated method stub

    }
    @Override
    public boolean addAll(LocalEvent... elements) {
        // TODO Auto-generated method stub
        return false;
    }
    @Override
    public boolean setAll(LocalEvent... elements) {
        // TODO Auto-generated method stub
        return false;
    }
    @Override
    public boolean setAll(Collection<? extends LocalEvent> col) {
        // TODO Auto-generated method stub
        return false;
    }
    @Override
    public boolean removeAll(LocalEvent... elements) {
        // TODO Auto-generated method stub
        return false;
    }
    @Override
    public boolean retainAll(LocalEvent... elements) {
        // TODO Auto-generated method stub
        return false;
    }
    @Override
    public void remove(int from, int to) {
        // TODO Auto-generated method stub

    }
}

任何帮助都表示赞赏。

标签： javajavafx

解决方案

评论中提到的第一件事是：你LocalEvent不应该实现ObservableList，它只是一个数据持有者。您可能还希望它还持有一个boolean以查看它是否已完成：

public class LocalEvent {

    private String description;
    private LocalDate date;
    private boolean completed = false;

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public LocalDate getDate() {
        return date;
    }

    public void setDate(LocalDate date) {
        this.date = date;
    }

    public void setCompleted(boolean completed) {
        this.completed= completed;
    }

    public LocalEvent(LocalDate date, String description) {
        this.setDate(date);
        this.setDescription(description);
    }

    @Override
    public String toString() {
        String base = "At " + this.getDate() + ": " + this.getDescription();
        return completed ? "[✓] " + base : base;
    }
}

我不知道jfoenix控件是什么，但我假设它们与 JavaFX 标准控件足够接近。ListView应该绑定到事件列表：

ObservableList<LocalEvent> list = FXCollections.observableArrayList();
ListView<LocalEvent> eventList = new ListView<>(list);

（我还将列表重命名为更有意义的名称。）

现在任何更改list都将反映在中，eventList因此您无需触摸eventList。这使您的done方法看起来像：

@FXML
void done(ActionEvent event) {
    int index = eventList.getSelectionModel().getSelectedIndex();
    LocalEvent localEvent = list.get(index);
    localEvent.setCompleted(true);
    list.set(index, localEvent);
}

请注意，我们需要重置列表中的项目，因为它不知道LocalEvent实例的字段已更改。您可以使用提取器使字段也报告更改，请参见此处以及此处的许多其他答案。

编辑取决于 使用的单元格ListView，我建议在此处阅读文档和其他问题。请注意，您可能希望能够单独编辑描述和日期，而不是整个toString值，因此您必须为此提供一种机制，例如恢复DatePicker.

嵌套取决于您希望它的外观。您可能需要定义自己的单元工厂，但考虑只添加一个缩进，通过"\t"s，这将使它看起来嵌套。如果你真的需要在数据模型中嵌套，那么每个LocalEvent都必须拥有自己的ObservableList<LocalEvent> nestedEvents.

此外，方法名称应以小写字母开头。

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