Question

无法实现倒计时器。下面的代码工作，但创建和额外的，不需要的窗口。如果没有TK作为类参数和Tk .__ init行，我会收到关于“after”函数的错误。错误是：

AttributeError：'MakeGUI'对象没有'after'后面的属性

思想？

    class MakeGUI(Tk):
        def __init__(self,master,width,height,color):
        Tk.__init__(self)
        self.master = master
        self.master.title("Falling Squares Game")
        # window not resizable either x or y
        self.master.resizable(0, 0)
        # make sure window on top
        self.master.wm_attributes("-topmost", 1)
        #self.master.after(1, lambda: self.master.focus_force())
        self.width = width
        self.height = height
        self.color = color
        self.canvas0 = Canvas(self.master,width=750,height=30,bg="light green")
        self.canvas0.pack()
        self.canvas1 = Canvas(self.master, width = self.width, height = self.height, bg = self.color)
        self.canvas1.pack()
        self.remaining = 0
        # set length of game to n seconds
        self.countdown(100)

    # count down timer
    def countdown(self, remaining = None):
        if remaining is not None:
            self.remaining = remaining
        if self.remaining <= 0:
            pass
        else:
            self.remaining = self.remaining - 1
            self.after(1000, self.countdown)

    def main():
    # create a Tk window
        win1 = Tk()
        win1x = 750
        win1y = 750
        # create the GUI
        c1 = MakeGUI(win1,win1x,win1y,"light blue")

Answer 1

代码不会产生你说的错误。

至于两个窗口，它会创建两个窗口，因为你告诉它创建两个窗口。第一个是这行代码：

    void kstrextend(kstring *strp, size_t nbytes)
    {
        char *data1;
        int len=strp->length;
        if(len < nbytes)
        {
            //allocate a new array with larger size
            data1 = realloc(strp->data, nbytes);
            if(data1 == NULL)
            {
                abort();
            }
            strp->data = data1;
            strp->length = nbytes;
            //remaining space of new array is filled with '\0'
            for (int i = len; i < nbytes; i++)
            {
                strp->data[i] = '\0';
            }
       }
   }

第二个是这行代码，因为win1 = Tk()继承自MakeGUI：

Tk

使用倒计时器和调色器

1 个答案: