我本来会写故障，但是我知道我将要学习一个我不知道的Javafx函数。
当我使用PauseTransition和SequentialTransition的组合来制作一个由四个网格的按钮组成的四连体游戏时，每个按钮都会向下浮动。在一个非常特定的用例下，我有一个非常意外的结果。
这里是运行和复制经编辑后的错误的所有代码，这些错误使它们独立且简单，同时仍保留基本的游戏逻辑。
import javafx.animation.PauseTransition;
import javafx.animation.SequentialTransition;
import javafx.application.Application;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;
import javafx.util.Duration;
public class ConnectFourApplication extends Application {
public static final int NUM_COLUMNS = 8;
public static final int NUM_ROWS = 8;
private Button[][] buttons;
private int row =0;
private int column = 0;
private PauseTransition buttonGravityPause;
private Scene scene;
private BorderPane border;
private ConnectEnum turnColor=ConnectEnum.RED;
public enum ConnectEnum{
RED ("Red"), BLACK ("Black");
private String turn;
ConnectEnum( String value) {
this.turn = value;
}
}
@Override
public void start(Stage primaryStage) {
buttons = new Button[NUM_ROWS][NUM_COLUMNS];
GridPane gridpane = new GridPane();
Button turn = new Button("Take turn");
for(int i=0; i<NUM_ROWS; i++){
for(int j = 0; j<NUM_COLUMNS; j++){
buttons[i][j] = new Button("Empty");
buttons[i][j].setMinHeight(20);
buttons[i][j].setMaxWidth(Double.MAX_VALUE);
buttons[i][j].setOnAction(new ButtonHandler<>(i,j));
gridpane.add(buttons[i][j], j, (NUM_ROWS-1)-i);
}
}
buttonGravityPause = new PauseTransition(new Duration(700));
buttonGravityPause.setOnFinished(event-> {
if (this.row>0) {
buttons[this.row - 1][this.column].setStyle("-fx-background-color:blue");
buttons[this.row][this.column].setStyle("");
this.row = this.row - 1;
}else System.out.println("THis should never happen, row is: "+this.row);
});
SequentialTransition s = new SequentialTransition(buttonGravityPause);
s.setOnFinished(floatDown-> {
System.out.println("The button " +row+ " " +column+" has been chosen");
buttons[this.row][this.column].setText(""+getTurn());
buttons[this.row][this.column].setStyle("-fx-background-color:"+getTurn());
changeTurn();
});
turn.setOnAction(e->{
System.out.println("The button " +row+ " " +column+" has been chosen");
int i =0;
while(this.row-i>0 && buttons[this.row-(i+1)][this.column].getText().equals("Empty"))i++;
s.setCycleCount(i);
System.out.println("i is: "+i+" but cycle count is: "+s.getCycleCount());
if(i>0)s.play(); else{
System.out.println("The button " +row+ " " +column+" has been chosen");
buttons[this.row][this.column].setText(""+getTurn());
buttons[this.row][this.column].setStyle("-fx-background-color:"+getTurn());
changeTurn();
}
});
border = new BorderPane();
border.setCenter(gridpane);
border.setBottom(turn);
scene = new Scene(border, 510, 380);
primaryStage.setTitle("Connect Four");
primaryStage.setScene(scene);
primaryStage.show();
}
private ConnectEnum getTurn(){return this.turnColor;}
private void changeTurn(){this.turnColor = this.turnColor==ConnectEnum.RED? ConnectEnum.BLACK:ConnectEnum.RED;}
private void setRowColumn(int row, int column){
this.row=row;
this.column=column;
}
private int getRow(){
return this.row;
}
private int getColumn(){
return this.column;
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
class ButtonHandler<T extends Event> implements EventHandler<T> {
private int row;
private int col;
ButtonHandler(int row, int column){
this.row=row;
this.col=column;
}
@Override
public void handle(T event){
if (buttons[getRow()][getColumn()].getText().equals("Empty")) buttons[getRow()][getColumn()].setStyle("");
if (buttons[this.row][this.col].getText().equals("Empty")) {
setRowColumn(this.row, this.col);
buttons[row][col].setStyle("-fx-background-color:blue");
}else System.out.println("This space is occupied");
}
}
}
在所有情况下，此功能都能正常运行 1.选择一个紧接在已放置按钮上方的按钮，然后2.选择下一个选择（如果将其放置在几个空白点上方）将导致以下控制台输出（包括前几个行为良好和预期的语句）：
The button2 1has been chosen i is: 2 but cycle count is: 2 The button 0 1 has been chosen false The button1 1has been chosen i is: 0 but cycle count is: 0 false The button4 2has been chosen i is: 4 but cycle count is: 4 THis should never happen, row is: 0 THis should never happen, row is: 0 THis should never happen, row is: 0 THis should never happen, row is: 0 THis should never happen, row is: 0 THis should never happen, row is: 0 THis should never happen, row is: 0 THis should never happen, row is: 0 THis should never happen, row is: 0 THis should never happen, row is: 0 THis should never happen, row is: 0 THis should never happen, row is: 0 THis should never happen, row is: 0 THis should never happen, row is: 0 THis should never happen, row is: 0 ... ... The button 0 2 has been chosen
要重现错误/竞赛条件： 1.选择任何按钮，然后按一下。 2.选择立即变色的按钮上方的按钮，然后按转弯。 3.选择一个不在按钮底部行中的按钮，然后观察魔术的发生。
以前，这会导致数组超出范围，但是我添加了一个if语句，这样我就可以避免错误并尝试阐明正在发生的事情。
如果有人对JavaFX的这一领域有任何经验，我会很感激，因为我很茫然。