python - 如何让多个 tk.text 小部件适应内容高度？

Question

我正在 Mac OS X 10.11.5 上使用 tcl/tk 8.5.9 和 python 3.5.1 开发 gui。

我正在尝试创建一种 tk.text 小部件列表，这些小部件具有固定宽度并在更改时调整高度以适应其内容(由用户或以编程方式)。这应该考虑到真实的和包裹的显示线。

我使用 Tkinter Resize text to contents 的答案让这个工作正常进行和 here 。但是，调整用户输入仅适用于最后创建的文本小部件。添加新文本小部件后，所有先前创建的文本小部件都不再调整大小。

我认为问题可能出在处理绑定(bind)标签的行中。作为 tkinter、python 的新手，而且对于一般编程也比较陌生，我不确定我是否正确理解了绑定(bind)标签。

非常感谢任何帮助，这是我的代码:

from tkinter import *

class ResizingText(Text):

def __init__(self, parent, *args, **kwargs):
    Text.__init__(self, master=parent, wrap='word', *args, **kwargs)

    # event binding on resize because text.count method for displaylines returns a wrong number when widget is instantiated
    self.bind('<Configure>', self.update_size)

    bindtags = list(self.bindtags())
    bindtags.insert(2, "custom")
    self.bindtags(tuple(bindtags))
    self.bind_class("custom", "<Key>", self.update_size)

def update_size(self, event):

    if self.winfo_width() > 1:
        self.unbind('<Configure>')

    displaylines = self.count("1.0", "end", "displaylines")
    self.config(height=displaylines)

root = Tk()

dynamic_text_1 = ResizingText(root, width=60)
dynamic_text_1.insert('1.0', "Longer text that is long enough to be wrapped into multiple display lines")
dynamic_text_1.grid(column=0, row=0)
# this text widget does not behave as expected:
# no resizing after user inputs a line break or a line long enough to be wrapped

dynamic_text_2 = ResizingText(root, width=60)
dynamic_text_2.insert('1.0', "Longer text that is long enough to be wrapped into multiple display lines")
dynamic_text_2.grid(column=0, row=1)
# this text widget behaves as expected

root.mainloop()

Answer 1

我通过配置绑定(bind)标签并在每次文本小部件获得焦点时重置按键事件上的事件绑定(bind)(FocusIn 上的事件绑定(bind))来解决此问题。

可能不是一个干净的解决方案，但它似乎工作正常:

from tkinter import *

class ResizingText(Text):
    def __init__(self, parent, *args, **kwargs):
        Text.__init__(self, master=parent, wrap='word', *args, **kwargs)

        # event binding on resize because text.count method for displaylines returns a wrong number when widget is instantiated
        self.bind('<Configure>', self.update_size)
        self.configure_bindtags(event=None)

        # solution: additional binding that resets the binding for <Key> events whenever the text widget gets the focus
        self.bind('<FocusIn>', self.configure_bindtags)

    def configure_bindtags(self, event):
        bindtags = list(self.bindtags())
        bindtags.insert(2, "custom")
        self.bindtags(tuple(bindtags))
        self.bind_class("custom", "<Key>", self.update_size)

    def update_size(self, event):
        if self.winfo_width() > 1:
            self.unbind('<Configure>')

        displaylines = self.count("1.0", "end", "displaylines")
        self.config(height=displaylines)

root = Tk()

dynamic_text_1 = ResizingText(root, width=60)
dynamic_text_1.insert('1.0', "Longer text that is long enough to be wrapped into multiple display lines")
dynamic_text_1.grid(column=0, row=0)

dynamic_text_2 = ResizingText(root, width=60)
dynamic_text_2.insert('1.0', "Longer text that is long enough to be wrapped into multiple display lines")
dynamic_text_2.grid(column=0, row=1)

root.mainloop()