Python Tkinter canvas.xview 单位

Question

Tkinter Canvas 滚动方法 xview(SCROLL, step, what) 和 yview(SCROLL, step,什么) 定义？它是以像素为单位定义的吗？是否可以更改它(例如，为了更慢的滚动)？

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提前致谢。

Answer 1

对于较慢的滚动，您可以使用 Canvas 的 xscrollincrement 和 yscrollincrement 选项:

from Tkinter import *

root = Tk()
c = Canvas(root, scrollregion=(0,0,500,500), height=200, width=200)
s = Scrollbar(root, command=c.yview)
c.pack(side=LEFT)
s.pack(side=RIGHT, fill=Y)
c.configure(yscrollcommand=s.set)


c.configure(yscrollincrement='2')
##yscrollincrement - increment for vertical scrolling, in pixels,
##millimeters '2m', centimeters '2c', or inches '2i'

c.create_rectangle(10,10,100,100)
c.create_rectangle(10,200,100,300)

def rollWheel(event):
    direction = 0
    if event.num == 5 or event.delta == -120:
     direction = 1
    if event.num == 4 or event.delta == 120:
     direction = -1
    event.widget.yview_scroll(direction, UNITS)

c.bind('<MouseWheel>', lambda event: rollWheel(event))
c.bind('<Button-4>', lambda event: rollWheel(event))
c.bind('<Button-5>', lambda event: rollWheel(event))

c.focus_set()

root.mainloop()