JavaFX：如何从 GridPane 中动态创建的文本字段的值计算平均值？

Question

我正在 JavaFx 中创建一个应用程序，其中我正在动态创建两个具有相同行数的 GridPanes，两个 GridPanes 都有文本字段，并且下面有一个这样的按钮：

用户可以像这样在 GridPane A 的动态创建的 TextField 中写入任意数字：

我想要的是当用户按下提交按钮时，程序应该计算每行中存在的值的总和，然后将每一行计算的总和除以整个 GridPane 的 TextFields 总和，并根据 GridPane 在第二个 GridPane 的 TextFields 中显示结果 A 行位置，例如 GridPane第 0 行的计算结果应该显示在 GridPane B 第 0 行中，如下所示：

我正在创建这样的 GridPane A：

public static GridPane tableA(int rows, Button button){
    GridPane table = new GridPane();

    rowValidationBindings = new BooleanBinding[rows];

    for(int i=0; i<rows; i++){
        TextField textField1 = new TextField();
        textField1.setAlignment(Pos.CENTER);
        TextField textField2 = new TextField();
        textField2.setAlignment(Pos.CENTER);
        TextField textField3 = new TextField();
        textField3.setAlignment(Pos.CENTER);

        rowValidationBindings[i] = Bindings.createBooleanBinding(
            () -> {
                if (textField1.getText().matches("\\d+") &&
                    textField2.getText().matches("\\d+") &&
                    textField1.getText().matches("\\d+") {
                    return true ;
                } else {
                    return false ;
                }
            }, textField1.textProperty(), textField2.textProperty(), textField3.textProperty()
        );

        table.add(textField1, 0, i+1);
        table.add(textField2, 1, i+1);
        table.add(textField3, 2, i+1);
    }

    button.disableProperty().bind(Bindings.createBooleanBinding(
        () -> ! Stream.of(rowValidationBindings).allMatch(BooleanBinding::get),
        rowValidationBindings
    ));

    return table;
}

网格窗格 B

public static GridPane tableB(int rows, Button button){
    GridPane table = new GridPane();

    rowValidationBindings = new BooleanBinding[rows];

    for(int i=0; i<rows; i++){
        TextField textField1 = new TextField();
        textField1.setAlignment(Pos.CENTER);

        rowValidationBindings[i] = Bindings.createBooleanBinding(
            () -> {
                if (textField1.getText().matches("\\d+") {
                    return true ;
                } else {
                    return false ;
                }
            }, textField1.textProperty()
        );

        table.add(textField1, 0, i+1);
    }

    button.disableProperty().bind(Bindings.createBooleanBinding(
    () -> ! Stream.of(rowValidationBindings).allMatch(BooleanBinding::get),
    rowValidationBindings
));
    return table;
}

从表中特定行和列返回组件的方法：

public static Node getComponent (int row, int column, GridPane table) {
         for (Node component : table.getChildren()) { // loop through every node in the table
             if(GridPane.getRowIndex(component) == row && 
                             GridPane.getColumnIndex(component) == column) {
                 return component;
             }
         }

         return null;
     }

按钮点击实现：

    @FXML
    private void calcul() {
        GridPane table = (GridPane) anchorPane.getChildren().get(0);
        for(int i=1 ; i<=comboxBox.getValue(); i++){
            String text0 = ((TextField) getComponent (i, 0, table)).getText();
            String text1 = ((TextField) getComponent (i, 1, table)).getText();
            String text2 = ((TextField) getComponent (i, 2, table)).getText();

              System.out.println(text0 + " " + text1 + " " + text2);
              System.out.println("Next Row");

    }

Answer 1

我认为您的方法是实现这一目标的正确方法，您可以尝试一下，当单击按钮时（即用其动作侦听器包装它）（NB . 未经测试）：

// pass the numberOfRows which is comboxBox.getValue()
// pass tableA and tableB.
// fetch the numbers (in a String format) from all TextFields at every row in tableA
// and caclulate the result after parsing the Strings from each as double values
// set the result in the corresponding TextField in tableB in every loop
private void calcul(GridePane tableA, GridPane tableB, int numberOfRows) {
     double result = 0;
     for(int i=0 ; i<numberOfRows; i++){
        result = (Double.parseDouble(((TextField) getComponent (i, 0, tableA)).getText()) +
                  Double.parseDouble(((TextField) getComponent (i, 1, tableA)).getText()) +
                  Double.parseDouble(((TextField) getComponent (i, 2, tableA)).getText()))
                                            / (numberOfRows*3);

        ((TextField) getComponent (i, 0, tableB)).setText(String.valueOf(result));

     }
}

更新

在OP在下面的cmets中提供了更多的解释之后，上面的代码需要做一些调整：

// pass the numberOfRows which is comboxBox.getValue()
// pass tableA and tableB.
private void calcul(GridePane tableA, GridPane tableB, int numberOfRows) {
    // first get the total and store it in a variable
    double total =0;
    for(Node node : tableA){
      if(node instanceof TextField){
         total += Double.parseDouble(((TextField)node).getText());
      }
    }

    // fetch the numbers (in a String format) from all TextFields at every row in tableA
    // and calculate the average after parsing the Strings from each as double values
    // set the average in the corresponding TextField in tableB in every loop
    double average = 0;
    for(int i=0 ; i<numberOfRows; i++){
       average = (Double.parseDouble(((TextField) getComponent (i, 0, tableA)).getText()) +
                  Double.parseDouble(((TextField) getComponent (i, 1, tableA)).getText()) +
                  Double.parseDouble(((TextField) getComponent (i, 2, tableA)).getText()))
                                           / (total);

       ((TextField) getComponent (i, 0, tableB)).setText(String.valueOf(average));

    }
}