TTK筆記本標簽關閉方法

Question

我有一個 TTK 筆記本，其中選項卡上有關閉按鈕，類似於 Internet 瀏覽器選項卡上的關閉按鈕，但我希​​望能夠將自定義方法綁定到各個關閉按鈕，以便我可以顯示諸如“您是嗎？希望在關閉前保存”或“您確定要關閉此選項卡嗎？” 取決於關閉的選項卡。

我遇到的問題是我不確定如何為單個按鈕創建自定義關閉方法，因為雖然可以使用 tkMessageBox 制作通用的是/否提示，但我不確定如何為每個選項卡創建特殊方法.

例如，一個表單會有一個個性化的方法詢問用戶他們是否想要保存所做的更改，然后調用適當的方法來保存表單，而一個常規選項卡可能沒有與它何時關閉相關的方法所有。

我目前用於在選項卡上創建關閉按鈕的代碼如下：

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 中打開一個 tkMessageBox 並檢查結果：

#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>>")