在 python 2.7 中，每当 Tkinter Text 小部件中的某些内容发生更改时，我都会尝试获取回调。
该程序使用基于此处找到的代码的多个帧：在 tkinter 中的两个帧之间切换
回调部分取自以下示例：http ://code.activestate.com/recipes/464635-call-a-callback-when-a-tkintertext-is-modified/
两个代码单独工作都很好，但是将这两个代码结合起来对我来说很困难。这是我尝试使用尽可能简单的代码。
import Tkinter as tk
class Texter(tk.Tk):
def __init__(self, *args, **kwargs):
tk.Tk.__init__(self, *args, **kwargs)
container = tk.Frame(self)
container.pack()
self.frames = {}
for F in (ConnectPage, EditorPage):
frame = F(container, self)
self.frames[F] = frame
frame.grid(row=0, column=0, sticky="nsew")
page_name = EditorPage.__name__
self.frames[page_name] = frame
self.show_frame(ConnectPage)
def show_frame(self, cont):
frame = self.frames[cont]
frame.tkraise()
def get_page(self, page_name):
return self.frames[page_name]
class ConnectPage(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
button1 = tk.Button(self, text="SecondPage",
command=lambda: controller.show_frame(EditorPage))
button1.grid(row=2, column=3, padx=15)
class EditorPage(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.text = tk.Text(self, height=25, width=80)
self.text.grid(column=0, row=0, sticky="nw")
button2 = tk.Button(self, text="FirstPage",
command=lambda: controller.show_frame(ConnectPage))
button2.grid(row=2, column=3, padx=15)
self.clearModifiedFlag()
self.bind_all('<<Modified>>', self._beenModified)
def _beenModified(self, event=None):
if self._resetting_modified_flag: return
self.clearModifiedFlag()
print("Hello!")
#self.beenModified(event)
def clearModifiedFlag(self):
self._resetting_modified_flag = True
try:
self.tk.call(self._w, 'edit', 'modified', 0)
finally:
self._resetting_modified_flag = False
if __name__ == '__main__':
gui = Texter()
gui.mainloop()
我尝试仅从回调示例中获取必要的部分。当文本被修改时，代码确实会进行回调（如果 self.tk.call(self._w, 'edit', 'modified', 0)行被注释掉），但是重置修改的标志不起作用，所以只有第一次修改被注册。
目前我收到以下错误：
第 67 行，在 clearModifiedFlag self.tk.call(self._w, 'edit', 'modified', 0) _tkinter.TclError: bad option "edit": must be cget or configure
在回调示例代码“编辑”工作正常。
编辑：这是工作代码
import Tkinter as tk
class Texter(tk.Tk):
def __init__(self, *args, **kwargs):
tk.Tk.__init__(self, *args, **kwargs)
container = tk.Frame(self)
container.pack()
self.frames = {}
for F in (ConnectPage, EditorPage):
frame = F(container, self)
self.frames[F] = frame
frame.grid(row=0, column=0, sticky="nsew")
page_name = EditorPage.__name__
self.frames[page_name] = frame
self.show_frame(ConnectPage)
def show_frame(self, cont):
frame = self.frames[cont]
frame.tkraise()
def get_page(self, page_name):
return self.frames[page_name]
class ConnectPage(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
button1 = tk.Button(self, text="SecondPage",
command=lambda: controller.show_frame(EditorPage))
button1.grid(row=2, column=3, padx=15)
class EditorPage(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.text = CustomText(self, height=25, width=80)
self.text.grid(column=0, row=0, sticky="nw")
self.text.bind("<<TextModified>>", self.onModification)
button2 = tk.Button(self, text="FirstPage",
command=lambda: controller.show_frame(ConnectPage))
button2.grid(row=2, column=3, padx=15)
def onModification(self, event):
print("Yellow!")
class CustomText(tk.Text):
def __init__(self, *args, **kwargs):
"""A text widget that report on internal widget commands"""
tk.Text.__init__(self, *args, **kwargs)
# create a proxy for the underlying widget
self._orig = self._w + "_orig"
self.tk.call("rename", self._w, self._orig)
self.tk.createcommand(self._w, self._proxy)
def _proxy(self, command, *args):
cmd = (self._orig, command) + args
result = self.tk.call(cmd)
if command in ("insert", "delete", "replace"):
self.event_generate("<<TextModified>>")
return result
if __name__ == '__main__':
gui = Texter()
gui.mainloop()