图形故障 ttk 小部件

如何解决图形故障 ttk 小部件

这一切都始于正常 tk.Scale 没有被正确恐惧的事实（我使用的是自定义主题）。
然后我切换到 ttk.Scale 但是当我改变它时它没有显示滑块上方的值。
然后我发现了 ttkwidget，它似乎可以工作，但有图形故障。有人有什么想法要解决吗？
代码：https://pastebin.com/bxgvsjSF
截图：https://ibb.co/tLdjLrx
附注此外，有问题的小部件加载小部件的速度非常慢

编辑：解决方案在最佳答案的评论中

解决方法

我找到了一种方法来消除 ttk.LabeledScale 中的故障。我认为问题在于整个 Label 小部件的重绘，所以我改用了 Canvas。使用 Canvas，当文本移动时，无需重新绘制背景，因此动画更流畅。

以下代码基于 ttk.LabeledScale 的源代码（来自 Python 3.9.1，您可以在 tkinter/ttk.py 中找到它）。但是小部件现在基于 Canvas，其中使用 create_window() 和 ćreate_text() 添加比例和文本。我修改了 __init__() 和 _adjust() 方法，并添加了一个 _on_theme_change() 方法，当主题更改时调用该方法以更新画布的样式并调整元素的位置。

import tkinter as tk
from tkinter import ttk


class LabeledScale(tk.Canvas):

    def __init__(self,master=None,variable=None,from_=0,to=10,**kw):
        self._label_top = kw.pop('compound','top') == 'top'

        tk.Canvas.__init__(self,master,**kw)
        self._variable = variable or tk.IntVar(master)
        self._variable.set(from_)
        self._last_valid = from_

        # use style to set the Canvas background color
        self._style = ttk.Style(self)
        self.configure(bg=self._style.lookup('Horizontal.TScale','background'))
        # create the scale
        self.scale = ttk.Scale(self,variable=self._variable,from_=from_,to=to)
        self.scale.bind('<<RangeChanged>>',self._adjust)

        # put scale in canvas
        self._scale = self.create_window(0,window=self.scale,anchor='nw')
        # put label in canvas (the position will be updated later)
        self._label = self.create_text(0,text=self._variable.get(),fill=self._style.lookup('TLabel','foreground'),anchor='s' if self._label_top else 'n')
        # adjust canvas height to fit the whole content
        bbox = self.bbox(self._label)
        self.configure(width=self.scale.winfo_reqwidth(),height=self.scale.winfo_reqheight() + bbox[3] - bbox[1])
        # bindings and trace to update the label
        self.__tracecb = self._variable.trace_variable('w',self._adjust)
        self.bind('<Configure>',self._adjust)
        self.bind('<Map>',self._adjust)
        # update sizes,positions and appearances on theme change
        self.bind('<<ThemeChanged>>',self._on_theme_change)

    def destroy(self):
        """Destroy this widget and possibly its associated variable."""
        try:
            self._variable.trace_vdelete('w',self.__tracecb)
        except AttributeError:
            pass
        else:
            del self._variable
        super().destroy()
        self.label = None
        self.scale = None

    def _on_theme_change(self,*args):
        """Update position and appearance on theme change."""
        def adjust_height():
            bbox = self.bbox(self._label)
            self.configure(height=self.scale.winfo_reqheight() + bbox[3] - bbox[1])

        self.configure(bg=self._style.lookup('Horizontal.TScale','background'))
        self.itemconfigure(self._label,'foreground'))
        self._adjust()
        self.after_idle(adjust_height)

    def _adjust(self,*args):
        """Adjust the label position according to the scale."""
        def adjust_label():
            self.update_idletasks() # "force" scale redraw
            x,y = self.scale.coords()
            if self._label_top:
                y = 0
            else:
                y = self.scale.winfo_reqheight()
            # avoid that the label goes off the canvas
            bbox = self.bbox(self._label)
            x = min(max(x,0),self.winfo_width() - (bbox[2] - bbox[0])/2)
            self.coords(self._label,x,y)  # move label
            self.configure(scrollregion=self.bbox('all'))
            self.yview_moveto(0)  # make sure everything is visible

        self.itemconfigure(self._scale,width=self.winfo_width())
        from_ = ttk._to_number(self.scale['from'])
        to = ttk._to_number(self.scale['to'])
        if to < from_:
            from_,to = to,from_
        newval = self._variable.get()
        if not from_ <= newval <= to:
            # value outside range,set value back to the last valid one
            self.value = self._last_valid
            return

        self._last_valid = newval
        self.itemconfigure(self._label,text=newval)
        self.after_idle(adjust_label)

    @property
    def value(self):
        """Return current scale value."""
        return self._variable.get()

    @value.setter
    def value(self,val):
        """Set new scale value."""
        self._variable.set(val)

root = tk.Tk()
style = ttk.Style(root)
style.theme_use('alt')

scale = LabeledScale(root,to=100,compound='bottom')
scale.pack(expand=True,fill='x')

root.mainloop()