滚动树视图时如何移动弹出窗口ttk.Combobox？

Question

这个问题是this的扩展。

当用户双击树视图时，我将组合框创建为弹出窗口。当我在树视图上滚动鼠标时，带有箭头的输入框移动正常。但是，关联的下拉列表框不会移动。我可以看到ttk组合框实际上是Entry和listbox/PopdownWindow的组合。但我找不到关于如何访问和移动列表框部分的适当文档。

import tkinter as tk
from tkinter import ttk

class ComboPopup(ttk.Combobox):
    def __init__(self, parent, itemId, col, **kw):
        super().__init__(parent, **kw)
        self.tv = parent
        self.iId = itemId
        self.column = col
        choices = ["option1", "option2", "option3"]
        v = tk.StringVar()
        self.config(state="readonly", textvariable=v, values=choices, width=9)

        self.focus_force()

        existingChoice = 1
        self.current(existingChoice)
        #self.set(self.choices[existingChoice])

        self.bind("<Return>", self.onReturn)
        self.bind("<Escape>", self.onEscape)
        #self.bind("<FocusOut>", self.onFocusOut)        

    def saveCombo(self):    
        self.tv.set(self.iId, column=self.column, value=self.get())
        print("EntryPopup::saveEdit---{}".format(self.iId))

    def onEscape(self, event):
        print("ComboPopup::onEscape")
        # give focus back to the treeview.
        self.tv.focus_set()

        self.destroy()
    def onReturn(self, event):
        self.tv.focus_set()
        self.saveCombo()
        self.destroy()

class EditableDataTable(tk.Frame):
    def __init__(self, parent):
        tk.Frame.__init__(self, parent)

        self.parent = parent
        self.tree = None
        self.comboPopup = None
        self.curSelectedRowId = ""
        columns = ("Col1", "Col2")
        # Create a treeview with vertical scrollbar.
        self.tree = ttk.Treeview(self, columns=columns, show="headings")
        self.tree.grid(column=0, row=0, sticky='news')
        self.tree.heading("#1", text="col1")
        self.tree.heading("#2", text="col2")
        self.vsb = ttk.Scrollbar(self, orient="vertical", command=self.tree.yview)
        self.tree.configure(yscrollcommand=self.vsb.set)
        self.vsb.grid(column=1, row=0, sticky='ns')

        self.grid_columnconfigure(0, weight=1)
        self.grid_rowconfigure(0, weight=1)

        col1 = []
        col2 = []
        for r in range(50):
            col1.append("data 1-{}".format(r))
            col2.append("data 2-{}".format(r))

        for i in range(min(len(col1),len(col2))):
            self.tree.insert('', i, values=(col1[i], col2[i]))

        self.tree.bind('<Double-1>', self.onDoubleClick)
        self.tree.bind("<MouseWheel>", self.onMousewheel)

    def onMousewheel(self, event):
        popupWindow = None
        #TODO: Fix the scroll of combobox (the associated listbox)        
        if self.comboPopup != None:
            if ttk.Combobox.winfo_exists(self.comboPopup):
                popupWindow = self.comboPopup

                pd = popupWindow.tk.call('ttk::combobox::PopdownWindow', popupWindow)
                lb = popupWindow.tk.eval('return {}.f.l'.format(pd))
                print("pw: {}".format(popupWindow))
                print("pd: {}".format(pd))
                print("lb: {}".format(lb))

        if popupWindow != None:
            def _move():
                try:
                    iid = popupWindow.iId
                    x, y, width, height = self.tree.bbox(iid, column="#2") #hardcoded to col2
                    popupWindow.place(x=x, y=y+height//2, anchor='w', width=width)
                except ValueError:
                    popupWindow.place_forget()
                except tk.TclError:
                    pass

            popupWindow.after(5, _move)
            if ttk.Combobox.winfo_exists(self.comboPopup):
                #pd.after(5, _move) # does not work
                #lb.after(5, _move) # does not work
                pass

    def createPopup(self, row, column):
        x, y, width, height = self.tree.bbox(row, column)

        # y-axis offset
        pady = height // 2
        self.comboPopup = ComboPopup(self.tree, row, column)
        self.comboPopup.x = x
        self.comboPopup.y = y+pady
        self.comboPopup.place(x=x, y=y+pady, anchor='w', width=width)

    def onDoubleClick(self, event):
        rowid = self.tree.identify_row(event.y)
        column = self.tree.identify_column(event.x)
        self.createPopup(rowid, column)

root = tk.Tk()

for row in range(2):
    root.grid_rowconfigure(row, weight=1)
root.grid_columnconfigure(0, weight=1)

label = tk.Label(root, text="Double-click to edit and press 'Enter'")
label.grid(row=0, column=0, sticky='news', padx=10, pady=5)

dataTable = EditableDataTable(root)
dataTable.grid(row=1, column=0, sticky="news", pady=10, padx=10)

root.geometry("450x300")
root.mainloop()

如何访问“列表框”并将其与“条目”一起移动？我在 Python 3 上使用 tkinter 8.6 版。

Answer 1

正如我之前在帖子How to move popup window when scrolling a tkinter treeview? 中所说，您需要移动小部件，这意味着进行数学计算并跟踪它。我不确定为什么在编辑过程中您需要一个以上的活动弹出窗口小部件。我对树视图进行内联编辑的解决方案是一次只允许编辑一个单元格。这样做可以降低支持这种事情所需的代码的复杂性。我在 github 上发布了一个工作演示，我会在这里发布代码，但演示中有很多代码。如果您想涵盖所有内容，Treeview 是一个非常难以处理的野兽。无论如何，我会在下面发布链接，试一试它可能适合您的需求。该代码目前正在处理中，但可以按原样使用。代码在一个文件中，无需导入。

https://github.com/unodan/TkInter-Treeview-Example-Demo