python - 标准ttk方式提供具有编辑功能的列表框

Question

我需要一个具有多项选择功能的列表控件以及一种供用户编辑显示列表的方法。

根据Python - python-list - ttk Listbox判断，ttk.Treeview 是显示列表的新黑色方式，也是 Tkinter.Listbox 的替代品。

是否也提供了一些常用/推荐的方法来合并列表编辑？

这通常是通过控件周围某处的三个按钮“添加”/“编辑”/“删除”来完成的(前两个按钮可能会弹出一个带有编辑控件的小窗口)，或者列表条目本身变成一个编辑器例如双击。手动实现任一逻辑都非常重要。

Answer 1

Tk 和 Tkinter 仅提供基本小部件；它们的可重复使用的组合超出了它们的范围。被遗弃的Tix包提供了一种机制和这些组件的集合，称为“mega-widgets”，但这个想法显然没有流行起来。

我按照以下方式按我的方式完成了它(使用模型- View -演示者设计模式)。

看起来像这样:

import tkinter
from tkinter import ttk
from tkinter import W, E


class View_EditableList(object):
    def __init__(self,root,root_row):
        """ List with buttons to edit its contents.
        :param root: parent widget
        :param roow_row: row in `root'. The section takes 2 rows.
        """

        self.list = tkinter.Listbox(root, selectmode=tkinter.EXTENDED)
        self.list.grid(row=root_row, sticky=(W, E))
        root.rowconfigure(root_row, weight=1)

        self.frame = ttk.Frame(root)
        self.frame.grid(row=root_row+1, sticky=(W, E))

        self.add = ttk.Button(self.frame, text="+", width=5)
        self.add.grid(row=0, column=1)
        self.edit = ttk.Button(self.frame, text="*", width=5)
        self.edit.grid(row=0, column=2)
        self.del_ = ttk.Button(self.frame, text="-", width=5)
        self.del_.grid(row=0, column=3)
        self.up = ttk.Button(self.frame, text=u"↑", width=5)
        self.up.grid(row=0, column=4)
        self.down = ttk.Button(self.frame, text=u"↓", width=5)
        self.down.grid(row=0, column=5)
        self.frame.grid_columnconfigure(0, weight=1)
        self.frame.grid_columnconfigure(6, weight=1)


class Presenter_EditableList(object):
    def __init__(self,view,root):
        """

        :param view: View_EditableList
        :param root: root widget to be used as parent for modal windows
        """
        self.root = root
        self.view = view
        view.add.configure(command=self.add)
        view.edit.configure(command=self.edit)
        view.del_.configure(command=self.del_)
        view.up.configure(command=self.up)
        view.down.configure(command=self.down)

    def add(self):
        w=View_AskText(self.root)
        self.root.wait_window(w.top)
        if w.value:
            self.view.list.insert(self.view.list.size(),w.value)

    def edit(self):
        l=self.view.list
        try:
            [index]=l.curselection()
        except ValueError:
            return
        w=View_AskText(self.root,l.get(index))
        self.root.wait_window(w.top)
        if w.value:
            l.delete(index)
            l.insert(index,w.value)

    def del_(self):
        l=self.view.list
        try:
            [index]=l.curselection()
        except ValueError:
            return
        l.delete(index)
        l.select_set(max(index,l.size()-1))

    def up(self):
        l = self.view.list
        try:
            [index] = l.curselection()
        except ValueError:
            return
        if index>0:
            v = l.get(index)
            l.delete(index)
            l.insert(index-1,v)
            l.select_set(index-1)

    def down(self):
        l = self.view.list
        try:
            [index] = l.curselection()
        except ValueError:
            return
        if index<l.size()-1:
            v = l.get(index)
            l.delete(index)
            l.insert(index+1,v)
            l.select_set(index+1)

    def getlist(self):
        return [self.view.list.get(i) for i in range(self.view.list.size())]

    def setlist(self,list_):
        self.view.list.delete(0,tkinter.END)
        for i,v in enumerate(list_):
            self.view.list.insert(i,v)

# supplemental class; it's in another file in my actual code
class View_AskText(object):
    """
    A simple dialog that asks for a text value.
    """
    def __init__(self, master, value=u""):
        self.value = None

        top = self.top = tkinter.Toplevel(master)
        top.grab_set()
        self.l = ttk.Label(top, text=u"Value:")
        self.l.pack()
        self.e = ttk.Entry(top)
        self.e.pack()
        self.b = ttk.Button(top, text='Ok', command=self.save)
        self.b.pack()

        if value: self.e.insert(0, value)
        self.e.focus_set()
        top.bind('<Return>', self.save)

    def save(self, *_):
        self.value = self.e.get()
        self.top.destroy()


root = tkinter.Tk()
view = View_EditableList(root, 5)
Presenter_EditableList(view, root)
root.mainloop()