问题描述
我使用此处提供的可滚动框架类在 tkinter 上工作: https://gist.github.com/mp035/9f2027c3ef9172264532fcd6262f3b01
这个类的实际代码是:
class ScrollFrame(ttk.Frame):
def __init__(self,parent):
super().__init__(parent) # create a frame (self)
s=ttk.Style()
s.configure('TFrame',background="#eff0f1")
#place canvas on self
self.canvas = tk.Canvas(self,borderwidth=0,background="#eff0f1",height = appHeight)
#place a frame on the canvas,this frame will hold the child widgets
self.viewPort = ttk.Frame(self.canvas,style='TFrame')
#place a scrollbar on self
self.vsb = ttk.Scrollbar(self,orient="vertical",command=self.canvas.yview)
#attach scrollbar action to scroll of canvas
self.canvas.configure(yscrollcommand=self.vsb.set)
#pack scrollbar to right of self
self.vsb.pack(side="right",fill="y")
#pack canvas to left of self and expand to fil
self.canvas.pack(side="left",fill="both",expand=True)
self.canvas_window = self.canvas.create_window((4,4),#add view port frame to canvas
window=self.viewPort,anchor="nw",tags="self.viewPort")
#bind an event whenever the size of the viewPort frame changes.
self.viewPort.bind("<Configure>",self.onFrameConfigure)
#bind an event whenever the size of the viewPort frame changes.
self.canvas.bind("<Configure>",self.onCanvasConfigure)
#perform an initial stretch on render,otherwise the scroll region has a tiny border until the first resize
self.onFrameConfigure(None)
def onFrameConfigure(self,event):
'''Reset the scroll region to encompass the inner frame'''
#whenever the size of the frame changes,alter the scroll region respectively.
self.canvas.configure(scrollregion=self.canvas.bBox("all"))
def onCanvasConfigure(self,event):
'''Reset the canvas window to encompass inner frame when required'''
canvas_width = event.width
#whenever the size of the canvas changes alter the window region respectively.
self.canvas.itemconfig(self.canvas_window,width = canvas_width)
它实际上工作得很好,除了我不能让鼠标滚轮在滚动条上工作……我必须点击滑块让它滑动。每当我尝试使用鼠标滚轮滚动时,控制台中都会出现此错误:
Traceback (most recent call last):
File "D:\Anaconda\lib\tkinter\__init__.py",line 1705,in __call__
return self.func(*args)
File "D:\Anaconda\lib\tkinter\__init__.py",line 1739,in yview
res = self.tk.call(self._w,'yview',*args)
_tkinter.TclError: unkNown option "": must be moveto or scroll
我找到了这个话题: tkinter: binding mousewheel to scrollbar
但为适应我的课程而给出的答案似乎都不起作用。
有谁知道我如何调整我的可滚动框架以使鼠标滚轮工作? 提前致谢!!
解决方法
好的,我找到了答案,所以我在这里发布了解决方案:
在 init 的末尾,我添加了这个:
self.viewPort.bind('<Enter>',self._bound_to_mousewheel)
self.viewPort.bind('<Leave>',self._unbound_to_mousewheel)
然后在我添加这个之后:
def _bound_to_mousewheel(self,event):
self.canvas.bind_all("<MouseWheel>",self._on_mousewheel)
def _unbound_to_mousewheel(self,event):
self.canvas.unbind_all("<MouseWheel>")
def _on_mousewheel(self,event):
self.canvas.yview_scroll(int(-1*(event.delta/120)),"units")
我现在可以用鼠标滚轮在指针所在的位置滚动条!
这里是完全工作的可滚动框架类代码:
class ScrollFrame(ttk.Frame):
def __init__(self,parent):
super().__init__(parent) # create a frame (self)
s=ttk.Style()
s.configure('TFrame',background="#eff0f1")
#place canvas on self
self.canvas = tk.Canvas(self,borderwidth=0,background="#eff0f1",height = appHeight)
#place a frame on the canvas,this frame will hold the child widgets
self.viewPort = ttk.Frame(self.canvas,style='TFrame')
#place a scrollbar on self
self.vsb = ttk.Scrollbar(self,orient="vertical")
#attach scrollbar action to scroll of canvas
self.canvas.configure(yscrollcommand=self.vsb.set)
#pack scrollbar to right of self
self.vsb.pack(side="right",fill="y")
#pack canvas to left of self and expand to fil
self.canvas.pack(side="left",fill="both",expand=True)
self.canvas_window = self.canvas.create_window((4,4),#add view port frame to canvas
window=self.viewPort,anchor="nw",tags="self.viewPort")
#bind an event whenever the size of the viewPort frame changes.
self.viewPort.bind("<Configure>",self.onFrameConfigure)
#bind an event whenever the size of the viewPort frame changes.
self.canvas.bind("<Configure>",self.onCanvasConfigure)
#perform an initial stretch on render,otherwise the scroll region has a tiny border until the first resize
self.onFrameConfigure(None)
self.viewPort.bind('<Enter>',self._unbound_to_mousewheel)
def _bound_to_mousewheel(self,"units")
def onFrameConfigure(self,event):
'''Reset the scroll region to encompass the inner frame'''
#whenever the size of the frame changes,alter the scroll region respectively.
self.canvas.configure(scrollregion=self.canvas.bbox("all"))
def onCanvasConfigure(self,event):
'''Reset the canvas window to encompass inner frame when required'''
canvas_width = event.width
#whenever the size of the canvas changes alter the window region respectively.
self.canvas.itemconfig(self.canvas_window,width = canvas_width)
当你想在 tkinter 中创建一个页面时,你所要做的就是这样调用它:
class NewPage(ttk.Frame):
def __init__(self,parent,controller):
ttk.Frame.__init__(self,parent)
self.scrollFrame = ScrollFrame(self)
如果你想在其中添加小部件,只需像这样使用“self.scrollFrame.viewPort”构建它们:
label = ttk.Label(self.scrollFrame.viewPort,text = "Label",anchor = "center")
希望它会帮助某人;)