如何修复tkinter中的键绑定

Question

我想让sprite在画布上四处移动，并尝试使用键绑定作为控件。当我运行该程序时，它不会移动，直到我尝试正确的密钥。我用鼠标按钮进行测试，它工作正常。

添加代码：

from tkinter import * 

class MainGame: 
    def __init__(self): 
     self.grid = [[""]*15 for n in range(15)] 
     self.grid[14][3] = 1 
     print(self.grid) 
     self.canvas = Canvas(root, width = 900, height = 900) 
     self.canvas.pack() 

     self.a, self.b = 45, 175 

    def noreaction(self, event): 
     print("It clicked") 
     print(self.a) 
     self.a += 50 
     self.b += 50 
     self.canvas.create_image(self.a, self.b, image = self.pl, tags = "p2Tag") 
     self.canvas.delete("p1Tag") 
     self.canvas.tag_bind("p2Tag", "<Key-q>", self.noreaction) 

    def run(self): 
     self.pl = PhotoImage(file = "player.png") 
     self.canvas.create_image(self.a, self.b, image = self.pl, tags = "p1Tag") 
     self.canvas.tag_bind("p1Tag", "<Key>", self.noreaction) 

     self.x0, self.y0, self.x1, self.y1 = -30, 150, 20, 200 

     for self.row in self.grid: 
      for self.column in self.row: 
       self.x0 += 50 
       self.x1 += 50 

       self.cell = self.canvas.create_rectangle(self.x0, self.y0, self.x1, self.y1) 
      self.y0 += 50 
      self.y1 += 50 
      self.x0 = -30 
      self.x1 = 20 

root = Tk() 
root.focus_set() 
obj = MainGame() 

obj.run() 

root.mainloop() 

Answer 1

经过一段时间搞乱你的代码后，它会缝合tag_bind只适用于鼠标点击。在查看了我在tag_bind中找到的所有文档后，没有什么说您可以将键绑定到绘制对象。因此，这里的解决方案是将根窗口绑定到键或绑定画布放置的框架。

我已将您的代码稍微更改为使其工作，但它应该可以帮助您移动正确的方向。如果没有更多的信息来说明你长期努力完成什么，很难提供一个好的答案，但我认为这会有所帮助。如果您还有其他问题，请告诉我。

from tkinter import * 

class MainGame: 
    def __init__(self, parent): 
     self.parent = parent 
     self.grid = [[""]*15 for n in range(15)] 
     self.grid[14][3] = 1 
     self.canvas = Canvas(self.parent, width = 900, height = 900) 
     self.canvas.pack()   
     self.a, self.b = 45, 175 

    #added an argument here so we can better control the player object. 
    def noreaction(self, old): 
     print("It clicked") 
     print(self.a) 
     self.a += 50 
     self.b += 50 
     self.canvas.delete(old) 
     # assigned the object to a class attribute 
     self.player_obj = self.canvas.create_image(self.a, self.b, image = self.pl, tags = "p2Tag") 
     # you will see <Key-q> and <q> work the same here. 
     self.parent.bind("<Key-q>", lambda x: self.noreaction(self.player_obj)) 

    def run(self): 
     self.pl = PhotoImage(file = "./Colors/blk.gif") 
     # assigned the object to a class attribute 
     self.player_obj = self.canvas.create_image(self.a, self.b, image = self.pl, tags = "p1Tag") 
     # you will see <Key-q> and <q> work the same here. 
     self.parent.bind("<q>", lambda x: self.noreaction(self.player_obj)) 


     self.x0, self.y0, self.x1, self.y1 = -30, 150, 20, 200 
     for self.row in self.grid: 
      for self.column in self.row: 
       self.x0 += 50 
       self.x1 += 50 

       self.cell = self.canvas.create_rectangle(self.x0, self.y0, self.x1, self.y1) 
      self.y0 += 50 
      self.y1 += 50 
      self.x0 = -30 
      self.x1 + 20 

root = Tk() 
root.focus_set() 
obj = MainGame(root) 

obj.run() 

root.mainloop() 

Answer 2

“<Key>” 不是一个事件上结合的有效键符。尝试一个有效的，对于一个完整的列表，你可以看看这里http://www.tcl.tk/man/tcl8.4/TkCmd/keysyms.htm

编辑：看来我错了，不知道这是一个有效的事件。你每天都会学到一些东西:)