JavaFX

Question

我希望这是最后一次 post 我打开这个..除了我在 GridPane 上的坐标，我已经尝试了所有方法 return 总是 null 而不是 Integer...

这不是这样的话题，这是一个具体的问题，所以请不要关闭或进行其他操作。我必须解决这个问题。

我的实际情况：这是我的代码。我的问题是.. 为什么当我点击 myGrid(GridPane) 时它总是 returns 'null'？谢谢..

这是我的 FXML 控制器：

Answer 1

您是否正在向您的 GridPane 添加某种类型的 Node？在此示例应用程序中，每个 Grid 添加了 StackPane。在所有 StackPane 上注册了相同的事件处理程序。

Main

package javafxapplication147;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

/**
 *
 * @author blj0011
 */
public class JavaFXApplication147 extends Application
{

    @Override
    public void start(Stage stage) throws Exception
    {
        Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));

        Scene scene = new Scene(root);

        stage.setScene(scene);
        stage.show();
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args)
    {
        launch(args);
    }

}

Controller

import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.Node;
import javafx.scene.control.Label;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.GridPane;

/**
 *
 * @author blj0011
 */
public class FXMLDocumentController implements Initializable
{

    @FXML
    private Label lblMain;

    @FXML
    private void handleOnMouseClicked(MouseEvent event)
    {
        Node source = (Node)event.getSource();
        Integer colIndex = (GridPane.getColumnIndex(source) == null) ?  0 : (GridPane.getColumnIndex(source));
        Integer colRow = (GridPane.getRowIndex(source) == null) ? 0 : (GridPane.getRowIndex(source));
        lblMain.setText(colIndex + " : " + colRow);
    }

    @Override
    public void initialize(URL url, ResourceBundle rb)
    {
        // TODO
    }    

}

FXML

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.RowConstraints?>
<?import javafx.scene.layout.StackPane?>
<?import javafx.scene.layout.VBox?>

<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="600.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="javafxapplication147.FXMLDocumentController">
   <children>
      <VBox layoutX="48.0" layoutY="14.0" prefHeight="200.0" prefWidth="100.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="50.0" AnchorPane.rightAnchor="50.0" AnchorPane.topAnchor="0.0">
         <children>
            <GridPane gridLinesVisible="true" style="-fx-background-color: green;">
              <columnConstraints>
                <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
                  <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
                  <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
                  <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
              </columnConstraints>
              <rowConstraints>
                  <RowConstraints minHeight="100.0" prefHeight="100.0" vgrow="SOMETIMES" />
                <RowConstraints minHeight="100.0" prefHeight="100.0" vgrow="SOMETIMES" />
                <RowConstraints minHeight="100.0" prefHeight="100.0" vgrow="SOMETIMES" />
                <RowConstraints minHeight="100.0" prefHeight="100.0" vgrow="SOMETIMES" />
                  <RowConstraints minHeight="100.0" prefHeight="100.0" vgrow="SOMETIMES" />
              </rowConstraints>
               <VBox.margin>
                  <Insets top="10.0" />
               </VBox.margin>
               <children>
                  <StackPane onMouseClicked="#handleOnMouseClicked" prefHeight="150.0" prefWidth="200.0" />
                  <StackPane onMouseClicked="#handleOnMouseClicked" prefHeight="150.0" prefWidth="200.0" GridPane.columnIndex="1" />
                  <StackPane onMouseClicked="#handleOnMouseClicked" prefHeight="150.0" prefWidth="200.0" GridPane.columnIndex="2" />
                  <StackPane onMouseClicked="#handleOnMouseClicked" prefHeight="150.0" prefWidth="200.0" GridPane.columnIndex="3" />
                  <StackPane onMouseClicked="#handleOnMouseClicked" prefHeight="150.0" prefWidth="200.0" GridPane.rowIndex="1" />
                  <StackPane onMouseClicked="#handleOnMouseClicked" prefHeight="150.0" prefWidth="200.0" GridPane.columnIndex="1" GridPane.rowIndex="1" />
                  <StackPane onMouseClicked="#handleOnMouseClicked" prefHeight="150.0" prefWidth="200.0" GridPane.columnIndex="2" GridPane.rowIndex="1" />
                  <StackPane onMouseClicked="#handleOnMouseClicked" prefHeight="150.0" prefWidth="200.0" GridPane.columnIndex="3" GridPane.rowIndex="1" />
                  <StackPane onMouseClicked="#handleOnMouseClicked" prefHeight="150.0" prefWidth="200.0" GridPane.rowIndex="2" />
                  <StackPane onMouseClicked="#handleOnMouseClicked" prefHeight="150.0" prefWidth="200.0" GridPane.columnIndex="1" GridPane.rowIndex="2" />
                  <StackPane onMouseClicked="#handleOnMouseClicked" prefHeight="150.0" prefWidth="200.0" GridPane.columnIndex="2" GridPane.rowIndex="2" />
                  <StackPane onMouseClicked="#handleOnMouseClicked" prefHeight="150.0" prefWidth="200.0" GridPane.columnIndex="3" GridPane.rowIndex="2" />
                  <StackPane onMouseClicked="#handleOnMouseClicked" prefHeight="150.0" prefWidth="200.0" GridPane.rowIndex="3" />
                  <StackPane onMouseClicked="#handleOnMouseClicked" prefHeight="150.0" prefWidth="200.0" GridPane.columnIndex="1" GridPane.rowIndex="3" />
                  <StackPane onMouseClicked="#handleOnMouseClicked" prefHeight="150.0" prefWidth="200.0" GridPane.columnIndex="2" GridPane.rowIndex="3" />
                  <StackPane onMouseClicked="#handleOnMouseClicked" prefHeight="150.0" prefWidth="200.0" GridPane.columnIndex="3" GridPane.rowIndex="3" />
                  <StackPane onMouseClicked="#handleOnMouseClicked" prefHeight="150.0" prefWidth="200.0" GridPane.rowIndex="4" />
                  <StackPane onMouseClicked="#handleOnMouseClicked" prefHeight="150.0" prefWidth="200.0" GridPane.columnIndex="1" GridPane.rowIndex="4" />
                  <StackPane onMouseClicked="#handleOnMouseClicked" prefHeight="150.0" prefWidth="200.0" GridPane.columnIndex="2" GridPane.rowIndex="4" />
                  <StackPane onMouseClicked="#handleOnMouseClicked" prefHeight="150.0" prefWidth="200.0" GridPane.columnIndex="3" GridPane.rowIndex="4" />
               </children>
            </GridPane>
            <StackPane prefHeight="150.0" prefWidth="200.0">
               <children>
                  <Label fx:id="lblMain" text="Label" />
               </children>
            </StackPane>
         </children>
      </VBox>
   </children>
</AnchorPane>

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