在可滚动框架上使用鼠标滚轮

Question

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......我必须点击滑块并让它滑动。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

我发现了这个话题： 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。

有谁知道如何调整我的可滚动框架以使鼠标滚轮工作？ 提前致谢！！

Answer 1

好的，我找到了答案，所以我在这里发布解决方案：

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地方滚动条！

这里是完整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._bound_to_mousewheel)
        self.viewPort.bind('<Leave>', self._unbound_to_mousewheel)

    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")

    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)

如果您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")

希望对某人有所帮助；）