TTK Notebook 选项卡关闭方法

Question

我有一个 TTK Notebook，其中选项卡上有关闭按钮，类似于 Internet 浏览器选项卡有关闭按钮的方式，但我希望能够将自定义方法绑定到各个关闭按钮，以便我可以显示提示，例如“您要在关闭前保存吗？”或“您确定要关闭此选项卡吗？”取决于关闭的选项卡。

我遇到的问题是我不确定如何为各个按钮创建自定义关闭方法，因为虽然可以使用 tkMessageBox 进行一般化是/否提示，但我不确定如何创建特殊方法对于每个选项卡。

例如，一个表单会有一个个性化的方法，询问用户是否要保存所做的更改，然后调用适当的方法来保存表单，而通用选项卡可能没有与何时保存相关的方法完全关闭了。

我目前用来在标签页上创建关闭按钮的代码如下：

try:
    import Tkinter as tk
    import ttk
except ImportError:  # Python 3
    import tkinter as tk
    from tkinter import ttk

class CustomNotebook(ttk.Notebook):
    """A ttk Notebook with close buttons on each tab"""
    __initialized = False

    def __init__(self, *args, **kwargs):
        if not self.__initialized:
            self.__initialize_custom_style()
            self.__inititialized = True

        kwargs["style"] = "CustomNotebook"
        ttk.Notebook.__init__(self, *args, **kwargs)

        self._active = None

        self.bind("<ButtonPress-1>", self.on_close_press, True)
        self.bind("<ButtonRelease-1>", self.on_close_release)

    def on_close_press(self, event):
        """Called when the button is pressed over the close button"""

        element = self.identify(event.x, event.y)

        if "close" in element:
            index = self.index("@%d,%d" % (event.x, event.y))
            self.state(['pressed'])
            self._active = index

    def on_close_release(self, event):
        """Called when the button is released over the close button"""
        if not self.instate(['pressed']):
            return

        element =  self.identify(event.x, event.y)
        index = self.index("@%d,%d" % (event.x, event.y))

        if "close" in element and self._active == index:
            self.forget(index)
            self.event_generate("<<NotebookTabClosed>>")

        self.state(["!pressed"])
        self._active = None

    def __initialize_custom_style(self):
        style = ttk.Style()
        self.images = (
            tk.PhotoImage("img_close", data='''
            R0lGODlhCAAIAMIBAAAAADs7O4+Pj9nZ2Ts7Ozs7Ozs7Ozs7OyH+EUNyZWF0ZWQg
            d2l0aCBHSU1QACH5BAEKAAQALAAAAAAIAAgAAAMVGDBEA0qNJyGw7AmxmuaZhWEU
            5kEJADs=
            '''),
            tk.PhotoImage("img_closeactive", data='''
            R0lGODlhCAAIAMIEAAAAAP/SAP/bNNnZ2cbGxsbGxsbGxsbGxiH5BAEKAAQALAAA
            AAAIAAgAAAMVGDBEA0qNJyGw7AmxmuaZhWEU5kEJADs=
            '''),
            tk.PhotoImage("img_closepressed", data='''
            R0lGODlhCAAIAMIEAAAAAOUqKv9mZtnZ2Ts7Ozs7Ozs7Ozs7OyH+EUNyZWF0ZWQg
            d2l0aCBHSU1QACH5BAEKAAQALAAAAAAIAAgAAAMVGDBEA0qNJyGw7AmxmuaZhWEU
            5kEJADs=
        ''')
    )

        style.element_create("close", "image", "img_close",
                        ("active", "pressed", "!disabled", "img_closepressed"),
                        ("active", "!disabled", "img_closeactive"), border=8, sticky='')
        style.layout("CustomNotebook", [("CustomNotebook.client", {"sticky": "nswe"})])
        style.layout("CustomNotebook.Tab", [
        ("CustomNotebook.tab", {
            "sticky": "nswe", 
            "children": [
                ("CustomNotebook.padding", {
                    "side": "top", 
                    "sticky": "nswe",
                    "children": [
                        ("CustomNotebook.focus", {
                            "side": "top", 
                            "sticky": "nswe",
                            "children": [
                                ("CustomNotebook.label", {"side": "left", "sticky": ''}),
                                ("CustomNotebook.close", {"side": "left", "sticky": ''}),
                            ]
                    })
                ]
            })
        ]
    })
])
if __name__ == "__main__":
    root = tk.Tk()
    notebook = CustomNotebook(width=200, height=200)
    notebook.pack(side="top", fill="both", expand=True)
    for color in ("red", "orange", "green", "blue", "violet"):
        frame = tk.Frame(notebook, background=color)
        notebook.add(frame, text=color)
    root.mainloop()

Answer 1

只需在 on_close_release 中打开一个 tkMessageBox 并检查结果：

#make sure to use 
import tkMessageBox

#[...]
        # ask the question
        result = tkMessageBox.askyesno("Really?", "Really really?")

        # check result as well
        if "close" in element and self._active == index and result:
            self.forget(index)
            self.event_generate("&lt&ltNotebookTabClosed>>")