列表視圖單元格加載空白而不是自定義單元格我試過重建 fxml 文件，使用調試工具，這些都沒有幫助。我在網上廣泛查看但只能找到舊版本 javafx listview 的指南。在有人告訴我 updateItem 代碼錯誤之前，請先幫我讓它工作，然后至少可以從某個地方開始優化它package Test;import java.io.IOException;import javafx.fxml.FXML;import javafx.fxml.FXMLLoader;import javafx.scene.control.Label;import javafx.scene.control.ListCell;import javafx.scene.layout.Pane;import org.controlsfx.glyphfont.Glyph;/** * FXML Controller class * * @author james */public class ListCellController2 extends ListCell<Student>{ FXMLLoader loader; @FXML private Glyph attendenceSymbolGlyph; @FXML private Label studentDetailsLabel; @FXML private Pane entryPane; @Override protected void updateItem(Student student, boolean empty) { super.updateItem(student, empty); if (empty || student == null) { setText(null); setGraphic(null); } else { loader = new FXMLLoader(getClass().getResource("ListCell2.fxml")); try { loader.load(); studentDetailsLabel.setText(student.toString()); setGraphic(entryPane); } catch (IOException ex) { ex.printStackTrace(); } } }}<?xml version="1.0" encoding="UTF-8"?><?import javafx.scene.control.Label?><?import javafx.scene.layout.Pane?><?import org.controlsfx.glyphfont.Glyph?><Pane fx:id="entryPane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="95.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="Test.ListCellController2"> <children> <Glyph id="attendenceSymbolGlyph" fx:id="attendenceSymbolGlyph" layoutX="5.0" layoutY="8.0" prefHeight="80.0" prefWidth="87.0" /> <Label id="studentDetailsLabel" fx:id="studentDetailsLabel" layoutX="113.0" layoutY="5.0" prefHeight="88.0" prefWidth="482.0" text="Label" /> </children></Pane>我的預期結果是它將我的數據加載到自定義單元格中然后顯示它，它實際上做的是給我一個空白單元格
1 回答
慕標5832272
TA貢獻1966條經驗 獲得超4個贊
看起來你創建了你的ListCellController2 類的兩個實例。
您在列表視圖單元工廠中創建第一個實例
第二個實例是在加載 FXML 時創建的，因為在 FXML 中給出了控制器類
我還建議您只在創建單元格時加載列表單元格組件一次，而不是每次顯示新值時都加載一次。
控制器由單元工廠創建，實例由 FXML 加載器使用。這樣，帶注釋的字段@FXML就可以正確初始化。
這是我的代碼：
MainController.java
import java.net.URL;
import java.util.ResourceBundle;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.ListView;
public class MainController implements Initializable {
@FXML
public ListView<Student> myListView;
public ObservableList<Student> studentList;
public MainController() {
studentList = FXCollections.observableArrayList();
studentList.add(new Student("Jimmy", "u0764987", "ef937b3"));
studentList.add(new Student("John", "u0762809", "543jh32"));
}
@Override
public void initialize(URL location, ResourceBundle resources) {
if (!studentList.isEmpty()) {
setupListView();
} else {
System.out.println("student list is empty");
}
}
private void setupListView() {
myListView.setItems(studentList);
myListView.setCellFactory((listView) -> new ListCellController2());
}
}
ListCellController2
import java.io.IOException;
import org.controlsfx.glyphfont.Glyph;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.control.Label;
import javafx.scene.control.ListCell;
import javafx.scene.layout.Pane;
public class ListCellController2 extends ListCell<Student> {
@FXML
private Glyph attendenceSymbolGlyph;
@FXML
private Label studentDetailsLabel;
@FXML
private Pane entryPane;
public ListCellController2() {
try {
FXMLLoader loader = new FXMLLoader();
loader.setController(this);
loader.setLocation(getClass().getResource("ListCell2.fxml"));
loader.load();
} catch (IOException e) {
throw new RuntimeException("Creating UI component failed", e);
}
}
@Override
protected void updateItem(Student student, boolean empty) {
super.updateItem(student, empty);
if (empty || student == null) {
setText(null);
setGraphic(null);
} else {
studentDetailsLabel.setText(student.toString());
setGraphic(entryPane);
}
}
}
ListCell2.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.Pane?>
<?import org.controlsfx.glyphfont.Glyph?>
<Pane fx:id="entryPane" prefHeight="95.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1">
<children>
<Glyph id="attendenceSymbolGlyph" fx:id="attendenceSymbolGlyph" layoutX="5.0" layoutY="8.0" prefHeight="80.0" prefWidth="87.0" />
<Label id="studentDetailsLabel" fx:id="studentDetailsLabel" layoutX="113.0" layoutY="5.0" prefHeight="88.0" prefWidth="482.0" text="Label" />
</children>
</Pane>
添加回答
舉報
0/150
提交
取消