TTK笔记本标签关闭方法

Question

我有一个 TTK 笔记本，其中选项卡上有关闭按钮，类似于 Internet 浏览器选项卡上的关闭按钮，但我希​​望能够将自定义方法绑定到各个关闭按钮，以便我可以显示诸如“您是吗？希望在关闭前保存”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单个按钮创建自定义关闭方法，因为虽然可以使用 tkMessageBox 制作通用的是/否提示，但我不确定如何为每个选项卡创建特殊方法.

例如，一个表单会有一个个性化的方法询问用户他们是否想要保存所做的更改，然后调用适当的方法来保存表单，而一个常规选项卡可能没有与它何时关闭相关的方法所有。

我目前用于在选项卡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("<&ltNotebookTabClosed>>")