Question

我的程序包括鼠标绘图：在顶层窗口上同时再现绘制的曲线。我的目标是将垂直和水平滚动条设置到顶层窗口。

绘图按照我的预期工作，除了我没有看到滚动条以及我收到此错误（但不会停止程序）：

Exception in Tkinter callback
Traceback (most recent call last):
   File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1489, in __call__
            return self.func(*args)
   File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1523, in yview
             res = self.tk.call(self._w, 'yview', *args)
TclError: unknown option "0.0": must be moveto or scroll

该计划包括以下几行：

from Tkinter import *
import numpy as np
import cv2
import Image, ImageTk

class Test:
    def __init__(self, parent):
        self.parent = parent
        self.b1="up"
        self.xold=None
        self.yold=None
        self.liste=[]
        self.top = TopLevelWindow()
        self.s=400,400,3
        self.im=np.zeros(self.s,dtype=np.uint8)
        cv2.imshow("hello",self.im)
    def test(self):
        self.drawingArea=Canvas(self.parent,width=400,height=400)
        self.drawingArea.pack() 
        self.drawingArea.bind("<Motion>",self.motion)
        self.drawingArea.bind("<ButtonPress-1>",self.b1down)
        self.drawingArea.bind("<ButtonRelease-1>",self.b1up)
    def b1down(self,event):
        self.b1="down"
    def b1up(self,event):
        self.b1="up"
        self.xold=None
        self.yold=None
        self.liste.append((self.xold,self.yold))
    def motion(self,event):
        if self.b1=="down":
            if self.xold is not None and self.yold is not None:
                event.widget.create_line(self.xold,self.yold,event.x,event.y,fill="red",width=3,smooth=TRUE)
                self.top.draw_line(self.xold,self.yold,event.x,event.y)
            self.xold=event.x
            self.yold=event.y
            self.liste.append((self.xold,self.yold))

class TopLevelWindow(Frame):
    def __init__(self):   
        Frame.__init__(self)
        self.top=Toplevel()
        self.top.wm_title("Second Window")
        self.canvas=Canvas(self.top,width=400,height=400)
        self.canvas.grid(row=0,column=0,sticky=N+E+S+W)

        self.sbarv=Scrollbar(self,orient=VERTICAL)
        self.sbarh=Scrollbar(self,orient=HORIZONTAL)
        self.sbarv.config(command=self.canvas.yview)
        self.sbarh.config(command=self.canvas.xview)
        self.canvas.config(yscrollcommand=self.canvas.yview)
        self.canvas.config(xscrollcommand=self.canvas.xview)
        self.sbarv.grid(row=0,column=1,sticky=N+S)
        self.sbarh.grid(row=1,column=0,sticky=W+E)
        self.canvas.config(scrollregion=(0,0,400,400))


    def draw_line(self, xold, yold, x, y):
        self.canvas.create_line(xold,yold,x,y,fill="blue",width=3,smooth=TRUE)


if __name__=="__main__":
    root = Tk()
    root.wm_title("Main Window")
    v = Test(root)
    v.test()
    root.mainloop()

Answer 1

这些行不正确：

self.canvas.config(yscrollcommand=self.canvas.yview)
self.canvas.config(xscrollcommand=self.canvas.xview)

当画布滚动时，您告诉画布滚动画布。 yscrollcommand和xscrollcommand选项通常需要调用滚动条的set方法：

self.canvas.config(yscrollcommand=self.sbarv.set)
self.canvas.config(xscrollcommand=self.sbarh.set)

Answer 2

我想分享我发现的解决方案，以防将来有人遇到这个问题：

我只将两个滚动条包围到与画布本身相同的父窗口小部件中。我的意思是：

self.sbarv=Scrollbar(self.top,orient=VERTICAL)
self.sbarh=Scrollbar(self.top,orient=HORIZONTAL)

TclError：未知选项“0.0”：必须移动到或滚动

2 个答案: