问题描述
所以我想在窗口上有一个垂直和水平滚动条,它会根据画布的大小自动更新。我在那里得到了一部分,现在代码为每次更新创建额外的滚动条,并且水平滚动条不会跨越整个画布的长度。这是我创建的一个示例来说明这一点:
import tkinter
from tkinter import ttk
root = tkinter.Tk()
root.state("zoomed")
bigframe = tkinter.Frame(root)
bigframe.pack(fill="both",expand=1)
canvas = tkinter.Canvas(bigframe)
canvas.pack(side="left",fill="both",expand=1)
scrollbarv = ttk.Scrollbar(bigframe,orient="vertical",command=canvas.yview)
scrollbarh = ttk.Scrollbar(bigframe,orient="horizontal",command=canvas.xview)
scrollbarv.pack(side="right",fill="y")
scrollbarh.pack(side="bottom",fill="x")
canvas.configure(yscrollcommand=scrollbarv.set,xscrollcommand=scrollbarh.set)
canvas.bind("<Configure>",lambda e: canvas.configure(scrollregion=canvas.bBox("all")))
mainframe = tkinter.Frame(canvas)
canvas.create_window((0,0),window=mainframe,anchor="nw")
i = 1
text = "Hello World! "
def click():
global i
global text
for t in range(10):
i += 1
text += "Hello World! "
tkinter.Label(mainframe,text=text).pack()
scrollbar = ttk.Scrollbar(bigframe,command=canvas.yview)
scrollbar.pack(side="right",fill="y")
button = tkinter.Button(mainframe,text="Click me!",command=click)
button.pack()
root.mainloop()
我相信水平滚动条很小是因为我说 canvas.pack(side="left",expand=1)
,但如果我说 side="top
,那么垂直滚动条不会跨越画布的高度。
是否有一些特定的代码导致了多个滚动条问题或水平条问题?如果是这样,我应该如何解决它?
解决方法
在添加新滚动条之前,您必须先销毁旧滚动条。只需将 scrollbar.destroy() 添加到您的点击函数中,就像我在下面所做的那样:
def click():
global i
global text
for t in range(10):
i += 1
text += "Hello World! "
tkinter.Label(mainframe,text=text).pack()
scrollbar = ttk.Scrollbar(bigframe,orient="vertical",command=canvas.yview)
scrollbar.destroy()
scrollbar.pack(side="right",fill="y")
我对您的代码进行了以下更改。起初它不起作用,但是如果我调整窗口大小,它就可以正常工作。
import tkinter
from tkinter import ttk
root = tkinter.Tk()
root.state("zoomed")
bigframe = tkinter.Frame(root)
bigframe.pack(fill="both",expand=1)
canvas = tkinter.Canvas(bigframe)
canvas.pack(side="left",fill="both",expand=1)
scrollbarv = ttk.Scrollbar(bigframe,command=canvas.yview)
scrollbarh = ttk.Scrollbar(root,orient="horizontal",command=canvas.xview)
scrollbarv.pack(side="right",fill="y")
scrollbarh.pack(side="bottom",fill="x")
canvas.configure(yscrollcommand=scrollbarv.set,xscrollcommand=scrollbarh.set)
canvas.bind("<Configure>",lambda e:
canvas.configure(scrollregion=canvas.bbox("all")))
mainframe = tkinter.Frame(canvas)
canvas.create_window((0,0),window=mainframe,anchor="nw")
i = 1
text = "Hello World! "
def updateScrollRegion():
canvas.update_idletasks()
canvas.config(scrollregion=mainframe.bbox())
def click():
global i,scrollbarv,text
for t in range(10):
i += 1
text += "Hello World! "
tkinter.Label(mainframe,text=text).pack()
button = tkinter.Button(mainframe,text="Click me!",command=click)
button.pack()
root.mainloop()