python - 可滚动框架未填满 Canvas

Question

我使用 Python 2.7，并且有一个可滚动框架，其中 Canvas 不会缩小以适应我想要滚动的框架。

我查看了这个问题的答案，但当我运行它时它不起作用: How to resize a scrollable frame to fill the canvas?

当我打印 Canvas 内框架的宽度时，它显示为 0。

我还在我的计算机上运行了这个问题的答案中的代码: Scrollable Frame does not resize properly using tkinter in Python但它仍然会在标签左侧显示白色 Canvas ，并且删除标签时不会调整大小。

看起来像这样:

这是我的代码，基于这个问题的答案: Adding a scrollbar to a group of widgets in Tkinter

from Tkinter import *

class Scrollable_frame(Frame):

    def __init__(self, parent, title, values):

        self.parent = parent

        Frame.__init__(self, self.parent)

        self.canvas = Canvas(self, borderwidth=0, background="#ffffff")
        self.scrollbar = Scrollbar(self, command=self.canvas.yview)
        self.innerFrame = Radiobutton_frame(self.canvas,title,values)

        self.canvas.configure(yscrollcommand=self.scrollbar.set)

        self.canvas.grid(row=0, column=0, sticky= N+S)
        self.scrollbar.grid(row=0, column=1, sticky = N+S)
        self.canvas.create_window((0,0),window = self.innerFrame,anchor="nw")

        self.innerFrame.bind("<Configure>", self.set_canvas_scrollregion)

        self.grid_rowconfigure(0, weight=1)
        self.grid_columnconfigure(0, weight=1)


    def set_canvas_scrollregion(self, event):

        width = event.width - 4
        self.canvas.itemconfigure("self.innerFrame ", width=width)
        self.canvas.config(scrollregion=self.canvas.bbox("all"))


class Radiobutton_frame(LabelFrame):

    def __init__(self, parent, title, values):

        """            
        In: parent - Canvas
            title - String
            values - List of Int
        """

        self.radiobuttons = {}
        self.parent = parent

        self.selection = StringVar()
        self.selection.set("init")

        LabelFrame.__init__(self, self.parent, text = title)

        for value in values:
            self.add_radiobutton(value)


    def add_radiobutton(self, value):

        """
        Adds a radiobutton to the frame.

        In: item - String
        """

        # Associate to same variable to make them function as a group
        self.radiobuttons[value] = Radiobutton(master = self,
                                                variable = self.selection,
                                                text = value,
                                                value = value)
        self.radiobuttons[value].pack(anchor=W)

# Usage example

root = Tk()
root.grid_rowconfigure(0, weight=1)
root.grid_columnconfigure(0, weight=1)
scrollableFrame = Scrollable_frame(root, "Canvas not resizing", range(30))
scrollableFrame.grid(row=0, column=0, sticky=N+S+E+W)

if __name__ == '__main__':
    root.mainloop()

Answer 1

我认为上述问题的代码片段不适合 a Minimal, Complete, and Verifiable example但至少它是可以运行的。

<小时/>

与 How to resize a scrollable frame to fill the canvas? 相比，您有三个错误

其中最重要的是，在链接的问题中，OP 使用了您不使用的选项 tags 。替换:

self.canvas.create_window((0,0),window = self.innerFrame,anchor="nw")

与:

self.canvas.create_window((0,0),window = self.innerFrame, anchor="nw", tags="my_tag")

另一个错误是您绑定(bind)了框架调整大小的事件，而不是实际 Canvas 的调整大小事件，Bryan's comment here 中也指出了这一点。 。替换:

self.innerFrame.bind("<Configure>", self.set_canvas_scrollregion)

与:

self.canvas.bind("<Configure>", self.set_canvas_scrollregion)

最后，tkinter 似乎不接受带有标签的空格字符，替换:

self.canvas.itemconfigure("self.innerFrame ", width=width)

与:

self.canvas.itemconfigure("my_tag", width=width)

最后，您应该:

from Tkinter import *

class Scrollable_frame(Frame):

    def __init__(self, parent, title, values):

        self.parent = parent

        Frame.__init__(self, self.parent)

        self.canvas = Canvas(self, borderwidth=0, background="#ffffff")
        self.scrollbar = Scrollbar(self, command=self.canvas.yview)
        self.innerFrame = Radiobutton_frame(self.canvas,title,values)

        self.canvas.configure(yscrollcommand=self.scrollbar.set)

        self.canvas.grid(row=0, column=0, sticky= N+S)
        self.scrollbar.grid(row=0, column=1, sticky = N+S)
        self.canvas.create_window((0,0),window = self.innerFrame,anchor="nw",
                                                                tags="my_tag")

        self.canvas.bind("<Configure>", self.set_canvas_scrollregion)

        self.grid_rowconfigure(0, weight=1)
        self.grid_columnconfigure(0, weight=1)


    def set_canvas_scrollregion(self, event):

        width = event.width - 4
        self.canvas.itemconfigure("my_tag", width=width)
        self.canvas.config(scrollregion=self.canvas.bbox("all"))


class Radiobutton_frame(LabelFrame):

    def __init__(self, parent, title, values):

        """            
        In: parent - Canvas
            title - String
            values - List of Int
        """

        self.radiobuttons = {}
        self.parent = parent

        self.selection = StringVar()
        self.selection.set("init")

        LabelFrame.__init__(self, self.parent, text = title)

        for value in values:
            self.add_radiobutton(value)


    def add_radiobutton(self, value):

        """
        Adds a radiobutton to the frame.

        In: item - String
        """

        # Associate to same variable to make them function as a group
        self.radiobuttons[value] = Radiobutton(master = self,
                                                variable = self.selection,
                                                text = value,
                                                value = value)
        self.radiobuttons[value].pack(anchor=W)

# Usage example

root = Tk()
root.grid_rowconfigure(0, weight=1)
root.grid_columnconfigure(0, weight=1)
scrollableFrame = Scrollable_frame(root, "Canvas not resizing", range(30))
scrollableFrame.grid(row=0, column=0, sticky=N+S+E+W)

if __name__ == '__main__':
    root.mainloop()