等到按下任何按钮？

Question

我正在用 JavaFX 编写 TicTacToe 游戏。我决定将一个面板制作成 9 (3x3) 个按钮，并更改文本：“”（如果为空）或 "X" 或 "O"。除了一件事，一切都很好......我被困在这里：

public void game() {

        while(keepPlaying) {
            if(computerTurn) {;
                computerMove();
            }else {
                while(waitForUser) {
                    //wait until any of 9 buttons is pushed!
                }
            }

            if (checkResult()) {
                keepPlaying = false;
            }
            computerTurn = !computerTurn;
        }
    }

如何等待用户按下这 9 个按钮中的任何一个，然后继续计算机转动？

我需要在控制台应用程序中等待扫描仪输入，但此输入必须是 9 个按钮之一...

我知道很少"possible duplicates"，但实际上那些问题是用我这里不能用的方法解决的，比如timer。如果我错了请纠正我。

Answer 1

不应在 JavaFX 中阻塞应用程序线程，因为它会冻结 UI。因此，这样的循环不太适合 JavaFX 应用程序。相反，您应该对用户输入做出反应：

public void game() {
    if (keepPlaying && computerTurn) {
        computerMove();
        if (checkResult()) {
            keepPlaying = false;
        }
        computerTurn = false;
    }
}

// button event handler
private void button(ActionEvent event) {
    if (keepPlaying) {
        Button source = (Button) event.getSource();

        // probably the following 2 coordinates are computed from GridPane indices
        int x = getX(source);
        int y = getY(source);

        // TODO: update state according to button pressed

        if (checkResult()) {
            keepPlaying = false;
        } else {
            computerMove();
            if (checkResult()) {
                keepPlaying = false;
            }
        }
    }

}

从 javafx 9 开始，在应用程序线程上有一个 public API for "pausing" 但是：

private static class GridCoordinates {
    int x,y;
    GridCoordinates (int x, int y) {
        this.x = x;
        this.y = y;
    }
}

private final Object loopKey = new Object();

public void game() {
    while(keepPlaying) {
        if(computerTurn) {
            computerMove();
        } else {
            // wait for call of Platform.exitNestedEventLoop(loopKey, *)
            GridCoordinates coord = (GridCoordinates)  Platform.enterNestedEventLoop(loopKey);

            // TODO: update state
        }

        if (checkResult()) {
            keepPlaying = false;
        }
        computerTurn = !computerTurn;
    }
}

private void button(ActionEvent event) {
    if (keepPlaying) {
        Button source = (Button) event.getSource();

        // probably the following 2 coordinates are computed from GridPane indices
        int x = getX(source);
        int y = getY(source);

        Platform.exitNestedEventLoop(loopKey, new GridCoordinates(x, y));
    }
}

等到按下任何按钮？

Wait until any button is pressed?

javafx

timer

button

wait

tic-tac-toe