反向乘法表javafx
对于这个应用程序，我需要输入一个数字并显示数字，当它们相乘时会给你相关的数字。例如，如果输入42，那么6 * 7和7 * 6的标签将改变颜色。我想出了如何得到答案，但我不知道如何操纵乘法表中的标签来改变颜色。为了给你一个想法，
主要课程
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 class
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;
}
}
申请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;
}
3 个答案:
答案 0 :(得分：2)
只需使用你的风格＆＃34; gridAnswer＆＃34;并设置它
l.getStyleClass().add( "gridAnswer");
或将其删除
l.getStyleClass().remove( "gridAnswer");
取决于您的需求。
修改：我可以建议采用不同的方法吗？
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，你可以这样做：
for( AnswerCell cell: answerCells) {
cell.unhighlight();
}
for( AnswerCell cell: answerCells) {
if( cell.matches(number)) {
cell.highlight();
}
}
答案 1 :(得分：1)
ReverseMultiplication.java
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package reversemultiplication;
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.Node;
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;
/**
*
* @author reegan
*/
public class ReverseMultiplication 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);
GridPane gridPane = setUpGrid();
GridpaneHelper gh = new GridpaneHelper(gridPane);
Button btnFindAnswer = new Button("Find answers");
btnFindAnswer.addEventHandler(MouseEvent.MOUSE_CLICKED, new EventHandler<Event>() {
@Override
public void handle(Event arg0) {
List<int[]> x = showFactors(tfProblem);
for (int[] x1 : x) {
Node node = gh.getChildren()[x1[0]][x1[1]];
node.setStyle("-fx-background-color: green");
}
}
});
prompt.getChildren().add(btnFindAnswer);
pane.setCenter(prompt);
pane.setBottom(gridPane);
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 List<int[]> showFactors(TextField problem) {
FactorCalculator calc = new FactorCalculator();
int number = Integer.parseInt(problem.getText());
System.out.println(number);
List<int[]> factors = calc.findFactor(number, 10);
System.out.println(factors);
return factors;
}
public static void main(String[] args) {
launch(args);
}
}
GridpaneHelper.java帮助gridpane节点访问。
package reversemultiplication;
import javafx.scene.Node;
import javafx.scene.layout.GridPane;
public class GridpaneHelper {
GridPane gridPane;
public GridpaneHelper(GridPane gridPane) {
this.gridPane = gridPane;
}
private int size() {
return gridPane.getChildren().size();
}
public int getColumnSize() {
int numRows = gridPane.getRowConstraints().size();
for (int i = 0; i < gridPane.getChildren().size(); i++) {
Node child = gridPane.getChildren().get(i);
if (child.isManaged()) {
int columnIndex = GridPane.getColumnIndex(child);
int columnEnd = GridPane.getColumnIndex(child);
numRows = Math.max(numRows, (columnEnd != GridPane.REMAINING ? columnEnd : columnIndex) + 1);
}
}
return numRows;
}
public int getRowSize() {
int numRows = gridPane.getRowConstraints().size();
for (int i = 0; i < gridPane.getChildren().size(); i++) {
Node child = gridPane.getChildren().get(i);
if (child.isManaged()) {
int rowIndex = GridPane.getRowIndex(child);
int rowEnd = GridPane.getRowIndex(child);
numRows = Math.max(numRows, (rowEnd != GridPane.REMAINING ? rowEnd : rowIndex) + 1);
}
}
return numRows;
}
public Node[] getColumnChilds(int columnNo) {
if (columnNo < getRowSize()) {
return getChildren()[columnNo];
}
return null;
}
public Node[] getRowChilds(int rowNo) {
Node n[] = new Node[getRowSize()];
if (rowNo <= getRowSize()) {
for (int i = 0; i < getRowSize(); i++) {
n[i] = getColumnChilds(i)[rowNo];
}
return n;
}
return null;
}
public Node[] getChildRowVia() {
Node n[] = new Node[size()];
int col = getColumnSize();
int arrIncre = 0;
for (int i = 0; i < col; i++) {
for (Node n1 : getRowChilds(i)) {
if (n1 != null) {
n[arrIncre] = n1;
arrIncre++;
}
}
}
return n;
}
public Node[][] getChildren() {
Node[][] nodes = new Node[getRowSize()][getColumnSize()];
for (Node node : gridPane.getChildren()) {
int row = gridPane.getRowIndex(node);
int column = gridPane.getColumnIndex(node);
nodes[row][column] = node;
}
return nodes;
}
public Integer postion(Node node, Pos pos) {
if (node != null) {
switch (pos) {
case Row:
return gridPane.getRowIndex(node);
case Column:
return gridPane.getColumnIndex(node);
}
}
return null;
}
enum Pos {
Row,
Column;
}
}
向FactorCalculator.java类文件添加了一个新方法，这有助于实现多少组合。
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package reversemultiplication;
import java.util.ArrayList;
import java.util.List;
/**
*
* @author reegan
*/
class FactorCalculator {
public List<Integer> list = new ArrayList<Integer>();
private int problem = 0;
public List<int[]> findFactor(int problem, int limit) {
int incrementer = 1;
this.problem = problem;
while (incrementer <= limit) {
if (problem % incrementer == 0) {
list.add(incrementer);
}
incrementer++;
}
return combinational();
}
public List<int[]> combinational() {
List<int[]> arrays = new ArrayList<>();
for (int i = 0; i < list.size(); i++) {
for (int j = 0; j < list.size(); j++) {
if (list.get(i) * list.get(j) == problem) {
int[] inx = new int[2];
inx[0] = list.get(i);
inx[1] = list.get(j);
arrays.add(inx);
}
}
}
return arrays;
}
}
在您的项目中添加您的css文件，但此示例代码在之前的设置样式中不明确。之后我会告诉您。
答案 2 :(得分：1)
Roland / ItachiUchiha的答案很好：这是另一种方法。
定义IntegerProperty以保存当前值：
public class Main extends Application {
private final IntegerProperty value = new SimpleIntegerProperty();
// ...
}
现在让每个标签都观察到值：
public void setUpLabel(final Label l, final int col, final int row) {
value.addListener((obs, oldValue, newValue) -> {
if (col * row == newValue.intValue()) {
l.getStyleClass().add("gridAnswer");
} else {
l.getStyleClass().remove("gridAnswer");
}
});
// all previous code...
}
最后，只需在按下按钮时设置值：
btnFindAnswer.addEventHandler(ActionEvent.ACTION, new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent arg0) {
// you probably don't need this any more:
int x = showFactors(tfProblem);
value.set(Integer.parseInt(tfProblem.getText()));
}
});
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