java - 逆乘法表javafx

Question

对于这个应用程序，我需要输入一个数字并显示这些数字，当这些数字相乘时就会得到所讨论的数字。例如，如果您输入 42，则 6*7 和 7*6 的标签会改变颜色。我想出了如何得到答案，但我不太明白如何操纵乘法表中的标签来改变颜色。给你一个想法，

主类

package application;

import java.util.List;

import javafx.application.Application;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) {
        BorderPane pane = new BorderPane();
        pane.setTop(getHbox1());

        HBox prompt = new HBox(15);
        prompt.setPadding(new Insets(15, 15, 15, 15));
        prompt.setAlignment(Pos.TOP_CENTER);
        prompt.getStyleClass().add("hbox2");

        Label lblProblem = new Label("Enter problem: ");
        prompt.getChildren().add(lblProblem);

        TextField tfProblem = new TextField();
        prompt.getChildren().add(tfProblem);

        Button btnFindAnswer = new Button("Find answers");
        btnFindAnswer.addEventHandler(MouseEvent.MOUSE_CLICKED, new EventHandler<Event>() {

            @Override
            public void handle(Event arg0) {
                int x = showFactors(tfProblem);

            }

        });

        prompt.getChildren().add(btnFindAnswer);

        pane.setCenter(prompt);
        pane.setBottom(setUpGrid());

        Scene scene = new Scene(pane, 550, 650);
        scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
        primaryStage.setTitle("lab 7");
        primaryStage.setScene(scene);
        primaryStage.show();

    }

    private HBox getHbox1() {
        HBox hbox = new HBox(15);
        hbox.setPadding(new Insets(15, 15, 15, 15));
        hbox.setAlignment(Pos.TOP_CENTER);
        hbox.getStyleClass().add("hbox1");

        Label lblProblem = new Label("Reverse Multiplication Table");
        hbox.getChildren().add(lblProblem);

        return hbox;
    }

    public GridPane setUpGrid() {
        GridPane pane = new GridPane();
        Label[][] labels = new Label[11][11];

        for (int row = 0; row < 11; row++)
            for (int col = 0; col < 11; col++) {
                Label l = new Label();
                setUpLabel(l, col, row);
                labels[row][col] = l;
                pane.add(l, col, row);
            }

        return pane;
    }

    public void setUpLabel(final Label l, final int col, final int row) {
        l.setPrefHeight(50);
        l.setPrefWidth(50);
        l.setAlignment(Pos.CENTER);
        l.setStyle("-fx-stroke-border: black; -fx-border-width: 1;");
        String a = String.valueOf(row);
        String b = String.valueOf(col);

        if (row == 0 || col == 0) {
            l.getStyleClass().add("gridBorders");

            if(row == 0) 
                l.setText(b);
            else if (col == 0) 
                l.setText(a);
        } else {
            l.setText(a + " * " + b);   
            l.getStyleClass().add("gridInside");

        }
    }

    public int showFactors(TextField problem) {
        FactorCalculator calc = new FactorCalculator();
        int number = Integer.parseInt(problem.getText());
        List<Integer> factors = calc.findFactor(number);

        for(int i = 0; i < factors.size() - 1; i++) {
            return factors.get(i);

        }

        return 0;
    }

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

}

factorCalculator 类

package application;

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

public class FactorCalculator {
    public List<Integer> list = new ArrayList<Integer>();

    public List<Integer> findFactor(int problem) {

        int incrementer = 1;

        if(problem % 2 != 0) {
            incrementer = 2;
        }

        while(incrementer <= problem) {
            if(problem % incrementer == 0) {
                list.add(incrementer);
            }

            incrementer++;
        }
        return list;
    }

}

应用程序 CSS

{
    -fx-text-alignment: center;
}

.hbox1 {
    -fx-background-color: gray;


}

.hbox2 {
    -fx-background-color: white;

}

.gridBorders {
    -fx-background-color: gray;
    -fx-text-fill:#A3FF47;
    -fx-border-style: solid;
    -fx-border-width: 1;
    -fx-stroke-border: black;

}

.gridInside {
    -fx-background-color: red;
    -fx-text-fill: white;
    -fx-border-style: solid;
    -fx-border-width: 1;
    -fx-stroke-border: black;
}

.gridAnswer {
    -fx-background-color: white;
    -fx-text-fill: black;

}

Answer 1

只需使用您的样式“gridAnswer”并进行设置

l.getStyleClass().add( "gridAnswer");

或删除它

l.getStyleClass().remove( "gridAnswer");

根据您的需要。

---

编辑:我可以建议一种不同的方法吗？

只需创建一个包含您需要的所有信息的自定义单元格。像这样:

private class AnswerCell extends Label {

    int a;
    int b;
    int value;

    public AnswerCell( int a, int b) {
        this.a = a;
        this.b = b;
        this.value = a * b;
        setText( a + " * " + b);
    }

    public boolean matches( int matchValue) {
        return value == matchValue;
    }

    public void highlight() {
        getStyleClass().add( "gridAnswer");
    }

    public void unhighlight() {
        getStyleClass().remove( "gridAnswer");
    }
}

在您的设置方法中，您只需添加单元格并将它们放入全局列表中:

List<AnswerCell> answerCells = new ArrayList<>();

要找到答案，您可以这样做:

for( AnswerCell cell: answerCells) {
    cell.unhighlight();
}

for( AnswerCell cell: answerCells) {
    if( cell.matches(number)) {
        cell.highlight();
    } 
}