Python tkinter绑定鼠标滚轮到滚动条

Question

我有这个可滚动的框架(实际上是画布内的框架).

import Tkinter as tk
class Scrollbarframe():
    def __init__(self, parent,xsize,ysize,xcod,ycod):
        def ScrollAll(event):
                canvas1.configure(scrollregion=canvas1.bbox("all"),width=xsize,height=ysize,bg='white')
        self.parent=parent
        self.frame1=tk.Frame(parent,bg='white')
        self.frame1.place(x=xcod,y=ycod)
        canvas1=tk.Canvas(self.frame1)
        self.frame2=tk.Frame(canvas1,bg='white',relief='groove',bd=1,width=1230,height=430)
        scrollbar1=tk.Scrollbar(self.frame1,orient="vertical",command=canvas1.yview)
        canvas1.configure(yscrollcommand=scrollbar1.set)
        scrollbar1.pack(side="right",fill="y")
        canvas1.pack(side="left")
        canvas1.create_window((0,0),window=self.frame2,anchor='nw')
        self.frame2.bind("<Configure>",ScrollAll)

我想将鼠标滚轮绑定到滚动条,以便用户可以向下滚动框架,而无需使用滚动条上的箭头按钮.环顾四周后,我添加了一个canvas1像我这样的绑定

self.frame1.bind("<MouseWheel>", self.OnMouseWheel)

这是功能:

def OnMouseWheel(self,event):
    self.scrollbar1.yview("scroll",event.delta,"units")
    return "break" 

但是当我使用鼠标滚轮时,滚动条不会移动.谁能帮我这个？我想要的只是当用户使用鼠标滚轮(在框架区域内/滚动条上)时,画布应自动向上或向下滚动.

Answer 1

也许最简单的解决方案是为鼠标滚轮进行全局绑定.然后无论鼠标下的哪个小部件或哪个小部件具有键盘焦点,它都会触发.然后,您可以无条件地滚动画布,或者您可以很聪明并找出哪些窗口应该滚动.

例如,在Windows上你会做这样的事情:

self.canvas = Canvas(...)
self.canvas.bind_all("<MouseWheel>", self._on_mousewheel)
...
def _on_mousewheel(self, event):
    self.canvas.yview_scroll(-1*(event.delta/120), "units")

请注意,self.canvas.bind_all这有点误导 - 您应该更正确地调用,root.bind_all但我不知道您定义根窗口的内容或方式.无论如何,这两个电话都是同义词.

平台差异:

• 在Windows上,你绑定到<MouseWheel>,你需要除以event.delta120(或一些其他因素取决于你想要滚动的速度)
• 在OSX上,你绑定到<MouseWheel>,你需要使用event.delta而无需修改
• 在X11系统上你需要绑定到<Button-4>和<Button-5>,你需要除以event.delta120(或一些其他因素取决于你想要滚动的速度)

有更多精确的解决方案涉及虚拟事件,并确定哪个窗口具有焦点或在鼠标下,或通过绑定传递画布窗口引用,但希望这将使您开始.

Answer 2

基于@ BryanOakley的回答,这里是一种仅滚动聚焦小部件的方法(即当前鼠标光标所在的小部件).

绑定到<Enter>与<Leave>事件的发生,其位于画布内的滚动框上,通过以下方式(scrollframe是画布内框):

    ....

    self.scrollframe.bind('<Enter>', self._bound_to_mousewheel)
    self.scrollframe.bind('<Leave>', self._unbound_to_mousewheel)

    return

def _bound_to_mousewheel(self, event):
    self.canv.bind_all("<MouseWheel>", self._on_mousewheel)   

def _unbound_to_mousewheel(self, event):
    self.canv.unbind_all("<MouseWheel>") 

def _on_mousewheel(self, event):
    self.canv.yview_scroll(int(-1*(event.delta/120)), "units")

Answer 3

此链接为您提供了如何使用滚轮的示例.

http://www.daniweb.com/software-development/python/code/217059/using-the-mouse-wheel-with-tkinter-python

我希望这有帮助!

# explore the mouse wheel with the Tkinter GUI toolkit
# Windows and Linux generate different events
# tested with Python25
import Tkinter as tk
def mouse_wheel(event):
    global count
    # respond to Linux or Windows wheel event
    if event.num == 5 or event.delta == -120:
        count -= 1
    if event.num == 4 or event.delta == 120:
        count += 1
    label['text'] = count
count = 0
root = tk.Tk()
root.title('turn mouse wheel')
root['bg'] = 'darkgreen'
# with Windows OS
root.bind("<MouseWheel>", mouse_wheel)
# with Linux OS
root.bind("<Button-4>", mouse_wheel)
root.bind("<Button-5>", mouse_wheel)
label = tk.Label(root, font=('courier', 18, 'bold'), width=10)
label.pack(padx=40, pady=40)
root.mainloop()

Answer 4

为了摆脱奇怪的因素120,我们可以看一下event.delta值的符号.这使得在Windows,Linux和Mac OS下使用相同的处理程序变得容易.

# Mouse wheel handler for Mac, Windows and Linux
# Windows, Mac: Binding to <MouseWheel> is being used
# Linux: Binding to <Button-4> and <Button-5> is being used

def MouseWheelHandler(event):
    global count

    def delta(event):
        if event.num == 5 or event.delta < 0:
            return -1 
        return 1 

    count += delta(event)
    print(count)

import tkinter
root = tkinter.Tk()
count = 0
root.bind("<MouseWheel>",MouseWheelHandler)
root.bind("<Button-4>",MouseWheelHandler)
root.bind("<Button-5>",MouseWheelHandler)
root.mainloop()