Python tkinter，使两个文本小部件的滚动同步

Question

我正在尝试使两个文本小部件的滚动同步。到目前为止，我已经实现了使用滚动条，当使用滚动条时它工作正常。但是，例如，当我将焦点放在其中一个文本小部件上并使用鼠标滚轮滚动时，只有具有焦点的文本小部件会滚动，滚动条也会更新，但其他文本保持不变。当使用向下翻页或向上翻页键时，以及据我所知，对于不使用滚动条的每种滚动形式，同样的行为会发生。

这是我的代码，我认为只有 init 是我绑定(bind)事件的相关部分，但以防万一我决定将所有代码放在一起:

## HexText class
#
#
class HexText (tkk.Frame):

    __POS_TEXT = "00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F"
    __OFFSET_TEXT = "0x00000000"
    __LINE_LENGTH = len(__POS_TEXT)

    def __init__(self, master):

        super(HexText, self).__init__(master)

        self.__create_widgets()
        self.__organize_widgets()

    def __scrolls(self, *args):
        self.__data.yview(*args)
        self.__offset.yview(*args)

    def __create_widgets(self):

        self.__scrollbar = tkk.Scrollbar(self)
        self.__scrollbar["orient"] = tk.VERTICAL
        self.__scrollbar["command"] = self.__scrolls

        self.__data = tk.Text(self)
        self.__data["height"] = 8
        self.__data["width"] = HexText.__LINE_LENGTH
        self.__data["state"] = tk.DISABLED
        self.__data["relief"] = tk.GROOVE
        self.__data["yscrollcommand"] = self.__scrollbar.set

        self.__offset = tk.Text(self)
        self.__offset["height"] = 8
        self.__offset["width"] = len(HexText.__OFFSET_TEXT)
        self.__offset["state"] = tk.DISABLED
        self.__offset["relief"] = tk.FLAT
        self.__offset["bg"] = self.winfo_toplevel()["bg"]
        self.__offset["yscrollcommand"] = self.__scrollbar.set

        self.__pos = tk.Text(self)
        self.__pos.insert(tk.CURRENT, HexText.__POS_TEXT)
        self.__pos["height"] = 1
        self.__pos["width"] = HexText.__LINE_LENGTH
        self.__pos["state"] = tk.DISABLED
        self.__pos["relief"] = tk.FLAT
        self.__pos["bg"] = self.winfo_toplevel()["bg"]

    def __organize_widgets(self):

        self.__pos.grid(row = 0, column = 1, sticky = tk.N + tk.E + tk.W + tk.S)
        self.__offset.grid(row = 1, column = 0, sticky = tk.N + tk.E + tk.W + tk.S)
        self.__data.grid(row = 1, column = 1, sticky = tk.N + tk.E + tk.W + tk.S)
        self.__scrollbar.grid(row = 1, column = 2, sticky = tk.N + tk.E + tk.W + tk.S)

    @staticmethod
    def __get_char_index(string):
        i = str.find(string, '.')

        if i >= 0:
            i = int(string[i+1:])
        else:
            raise ValueError

        return i

    @staticmethod
    def __get_line_index(string):
        i = str.find(string, '.')

        if i >= 0:
            i = int(string[:i])
        else:
            raise ValueError

        return i

    @staticmethod
    def __get_hex_value(string):

        if (len(string) != 1):
            raise ValueError

        i = "%02X" % ord(string)

        return i

    def __update_offset(self, line_index):

        i = "0x%08X\n" % ((line_index) * 0x10)
        self.__offset["state"] = tk.NORMAL
        self.__offset.insert(tk.CURRENT, i)
        self.__offset["state"] = tk.DISABLED

    def __append(self, string):
        self.__data["state"] = tk.NORMAL
        self.__data.insert(tk.CURRENT, string)
        self.__data["state"] = tk.DISABLED

    def __write_char(self, string):
        str_index = self.__data.index(tk.CURRENT)
        i = HexText.__get_char_index(str_index)

        if (len(string) != 1):
            raise ValueError

        if (i == 0):
            self.__update_offset(HexText.__get_line_index(str_index) - 1)

        if (i == HexText.__LINE_LENGTH - 2):
            self.__append(HexText.__get_hex_value(string) + '\n')
        else:
            self.__append(HexText.__get_hex_value(string) + ' ')

    def write_str(self, string):

        for chars in string:
            self.__write_char(chars)

这是我尝试创建的小部件的图像，一个简单的十六进制查看器(两个文本小部件的行数相同):

http://i.stack.imgur.com/Yb8IH.png

所以我的问题是，我是否应该独立处理所有向上翻页、向下翻页、鼠标滚轮和所有其他形式的滚动？有没有更简单的方法让两个文本小部件始终具有相同的滚动效果？

Answer 1

我知道这有点旧，但这个解决方案非常有效。默认情况下，文本小部件会响应滚动鼠标滚轮，因此无需绑定(bind)任何内容。

import sys
if sys.version[0] < '3':
    from Tkinter import *
else:
    from tkinter import *


class ScrolledTextPair(Frame):
    '''Two Text widgets and a Scrollbar in a Frame'''

    def __init__(self, master, **kwargs):
        Frame.__init__(self, master) # no need for super

        # Different default width
        if 'width' not in kwargs:
            kwargs['width'] = 30

        # Creating the widgets
        self.left = Text(self, **kwargs)
        self.left.pack(side=LEFT, fill=BOTH, expand=True)
        self.right = Text(self, **kwargs)
        self.right.pack(side=LEFT, fill=BOTH, expand=True)
        self.scrollbar = Scrollbar(self)
        self.scrollbar.pack(side=RIGHT, fill=Y)

        # Changing the settings to make the scrolling work
        self.scrollbar['command'] = self.on_scrollbar
        self.left['yscrollcommand'] = self.on_textscroll
        self.right['yscrollcommand'] = self.on_textscroll

    def on_scrollbar(self, *args):
        '''Scrolls both text widgets when the scrollbar is moved'''
        self.left.yview(*args)
        self.right.yview(*args)

    def on_textscroll(self, *args):
        '''Moves the scrollbar and scrolls text widgets when the mousewheel
        is moved on a text widget'''
        self.scrollbar.set(*args)
        self.on_scrollbar('moveto', args[0])


# Example
if __name__ == '__main__':
    root = Tk()

    t = ScrolledTextPair(root, bg='white', fg='black')
    t.pack(fill=BOTH, expand=True)
    for i in range(50):
        t.left.insert(END,"foo %s\n" % i)
        t.right.insert(END,"bar %s\n" % i)

    root.title("Text scrolling example")
    root.mainloop()