是否可以使按钮在 canvas 内滚动？

Question

我一直在尝试在 canvas 中制作一个可滚动的按钮，但它不会滚动。

我试过将它放在 ListBox 中，canvas，frame 没用。我已经尝试了一切，但此时仍然不知道该怎么做。

from tkinter import *

FrameU = Tk()
frameN=Frame(FrameU,width=540,height=800,bg="#A0522D")
frameN.place(x=0,y=0,relx=.2,rely=.2)
canvas=Canvas(frameN,bg="#A0522D",width=400,height=800)
scrollbar = Scrollbar(frameN, orient = VERTICAL,width=20,relief=SUNKEN)
scrollbar.pack(side=RIGHT, fill=Y)
scrollbar.config(command=canvas.yview)
canvas.config(width=540,height=800,relief=SUNKEN)
canvas.config(yscrollcommand=scrollbar.set)



mylist=Listbox(canvas,bg="#A0522D",width=100,height=41,bd=5,highlightthickness=0,yscrollcommand=scrollbar.set )
for i in range(100):
    mylist.insert(END, i)

b = Button(canvas,bg="blue",width=5,height=5)
b.place(rely=.5,relx=.5)

mylist.config(yscrollcommand=scrollbar.set)
mylist.pack(side=LEFT,fill=BOTH)
canvas.pack(side=LEFT)

我没有收到任何错误或任何错误，但是如果我将它放在我的列表框中，它会显示在 "for i in range(100):" 中它会显示在 canvas ".!frame.![=19= 中.!listbox.!button

Answer 1

可滚动按钮。你的意思是按钮的位置随着滚动条滑块的移动而变化？在最简单的情况下乍一看似乎是不可能的。

但是你可以给你的滚动条绑定一个回调函数，这个函数会随着鼠标移动滚动条滑块同步改变按钮的位置。这是一个工作示例：

from tkinter import *
from tkinter import ttk

rx, ry = 0.45, 0.45           # the button position (relative)

root=Tk()

wCanvas, hCanvas = 400, 350   # size of canvas
w1, h1 = 800, 700             # size of scrollable area

vBar = ttk.Scrollbar(root, orient = VERTICAL)
can1 = Canvas(root, scrollregion = (0,0,w1,h1), width = wCanvas, height = hCanvas, yscrollcommand = vBar.set)
vBar['command'] = can1.yview

vBar.pack(side=RIGHT,fill=Y)
can1.pack()

can1.create_line(10, 10, 100, 100)   # for canvas scrolling confirmation only

but1 = Button(can1)
but1.place(relx = rx, rely = ry)

def VscrollBarMove(event):  # callback function
    but1.place(relx = rx, rely = ry + vBar.get()[0])  # Scrollbar.get() returns a tuple with relative positions of upper (for vertical scrollbar) and lower edges of a slider

vBar.bind('<B1-Motion>', VscrollBarMove)

root.mainloop()

2 键案例的回调函数版本：

def VscrollBarMove(event):  # callback function
    but1.place(relx = rx, rely=ry+vBar.get()[0])
    but2.place(rely = ry2 + vBar.get()[0])  # You can set the only desirable coordinate if You want

是否可以使按钮在 canvas 内滚动？

Is it possible to make a button scrollable inside a canvas?

tkinter

python-3.x

tkinter-canvas