python - 调用命令后 Tkinter 按钮突出显示功能停止工作

Question

我一直在 tkinter 中开发我的第一个 GUI - 我使用的是 Windows。我现在的目标是拥有可以实现这些目标的按钮:

1. 当鼠标悬停在按钮上时，按钮会突出显示。
2. 如果单击该按钮，该按钮将保持突出显示状态。
3. 一次只能“选择”(点击突出显示)一个按钮。

我最初以为我已经完成了这个!但我现在意识到我的工作还没有完成。

这是我所看到的:

1. 我将鼠标悬停在按钮 A 上。它会突出显示! (好)
2. 我点击按钮 A。它保持突出显示! (好)
3. 我将鼠标悬停在按钮 B 上。它会突出显示! (好)
4. 我点击按钮 B。它保持突出显示! A 的高亮部分被删除! (好)
5. 我将鼠标悬停在按钮 A 上。它没有突出显示。 (不好)

当我单击按钮 B 时，我正在调用按钮 A 上的 default_coloring 类函数。但是，这似乎关闭了按钮 A 的突出显示功能，并且根据我在顶部。

即使在调用命令之后，如何确保按钮继续正常工作？我是否以错误的方式处理这个问题？

  import tkinter as tk

  blue = '#0000BB'
  white = '#FFFFFF'

  class HoverButton(tk.Button):
        def __init__(self, master, position = None, **kw):
              tk.Button.__init__(self,master=master,**kw)
              self.defaultBackground = self["background"]
              self.defaultForeground = self["foreground"]
              self.bind("<Enter>", self.on_enter)
              self.bind("<Leave>", self.on_leave)
              self.bind("<Button-1>", self.hover_click)
              self.state = 0
              self.position = position

        def on_enter(self, e):
              if self.state == 0:
                    self['background'] = self['activebackground']
                    self['foreground'] = self['activeforeground']

        def on_leave(self, e):
              if self.state == 2:
                    self.state = 0
              if self.state == 0:
                    self['background'] = self.defaultBackground
                    self['foreground'] = self.defaultForeground

        def hover_click(self, e):
              self.state += 1
              self.state = self.state % 3
              if self.state == 2:
                    self['background'] = self.defaultBackground
                    self['foreground'] = self.defaultForeground

        def default_coloring(self):
              self['background'] = self.defaultBackground
              self['foreground'] = self.defaultForeground

  class AddOnFrame(tk.Frame):
        def __init__(self, master):
              self.selectedbutton = None
              super().__init__(master)
              games = ['A','B','C']
              self.objs = list()
              self['bg'] = blue
              for i in range(3):
                    self.objs.append(HoverButton(self,position = i, text = games[i].upper(), activebackground = white,activeforeground = blue,fg = white, bg = blue, borderwidth=0, relief = 'flat', highlightbackground = white))
                    self.objs[i]['command'] = lambda c=i: self._hover_button_clicked(self.objs[c])
                    self.objs[i].grid(row = i, column = 0, sticky = tk.W + tk.E)
              self.blanklabel = tk.Label(self, text = '', background = white)
              self.blanklabel.grid(row = 0, column = 1,rowspan = 10, sticky = tk.N + tk.E + tk.W + tk.S)
              self.grid_columnconfigure(1, weight=1, minsize=10)
              self.grid_columnconfigure(2, weight=1, minsize=500)
              self.grid_columnconfigure(3, weight=1, minsize=500)
              self.grid_columnconfigure(4, weight=1, minsize=500)
              self.pack(expand = True)

        def _hover_button_clicked(self, HoverButton):
              self.lastbutton = self.selectedbutton
              if self.lastbutton != None:
                    self.objs[self.lastbutton].default_coloring()
              self.selectedbutton = HoverButton.position

  window = tk.Tk()
  window.geometry('1750x950')
  window['bg'] = blue
  window.title('Testing')
  lf = AddOnFrame(window)
  lf['bg'] = blue

  window.mainloop()

Answer 1

我想我找到了问题的主要根源。单击另一个按钮时，您将恢复上次单击的按钮的颜色，但不会重置其状态。将 default_coloring 函数更改为:

def default_coloring(self):
          self.state = 0
          self['background'] = self.defaultBackground
          self['foreground'] = self.defaultForeground

但是如果再次按下相同的按钮，您还应该防止default_coloring:

def _hover_button_clicked(self, HoverButton):
          self.lastbutton = self.selectedbutton
          if (self.lastbutton != None) and (self.lastbutton != HoverButton.position):
                self.objs[self.lastbutton].default_coloring()
          self.selectedbutton = HoverButton.position