Lib/idlelib/ToolTip.py

   1 # general purpose 'tooltip' routines - currently unused in idlefork
   2 # (although the 'calltips' extension is partly based on this code)
   3 # may be useful for some purposes in (or almost in ;) the current project scope
   4 # Ideas gleaned from PySol
   5
   6 from tkinter import *
   7
   8 class ToolTipBase:
   9
  10     def __init__(self, button):
  11         self.button = button
  12         self.tipwindow = None
  13         self.id = None
  14         self.x = self.y = 0
  15         self._id1 = self.button.bind("<Enter>", self.enter)
  16         self._id2 = self.button.bind("<Leave>", self.leave)
  17         self._id3 = self.button.bind("<ButtonPress>", self.leave)
  18
  19     def enter(self, event=None):
  20         self.schedule()
  21
  22     def leave(self, event=None):
  23         self.unschedule()
  24         self.hidetip()
  25
  26     def schedule(self):
  27         self.unschedule()
  28         self.id = self.button.after(1500, self.showtip)
  29
  30     def unschedule(self):
  31         id = self.id
  32         self.id = None
  33         if id:
  34             self.button.after_cancel(id)
  35
  36     def showtip(self):
  37         if self.tipwindow:
  38             return
  39         # The tip window must be completely outside the button;
  40         # otherwise when the mouse enters the tip window we get
  41         # a leave event and it disappears, and then we get an enter
  42         # event and it reappears, and so on forever :-(
  43         x = self.button.winfo_rootx() + 20
  44         y = self.button.winfo_rooty() + self.button.winfo_height() + 1
  45         self.tipwindow = tw = Toplevel(self.button)
  46         tw.wm_overrideredirect(1)
  47         tw.wm_geometry("+%d+%d" % (x, y))
  48         self.showcontents()
  49
  50     def showcontents(self, text="Your text here"):
  51         # Override this in derived class
  52         label = Label(self.tipwindow, text=text, justify=LEFT,
  53                       background="#ffffe0", relief=SOLID, borderwidth=1)
  54         label.pack()
  55
  56     def hidetip(self):
  57         tw = self.tipwindow
  58         self.tipwindow = None
  59         if tw:
  60             tw.destroy()
  61
  62 class ToolTip(ToolTipBase):
  63     def __init__(self, button, text):
  64         ToolTipBase.__init__(self, button)
  65         self.text = text
  66     def showcontents(self):
  67         ToolTipBase.showcontents(self, self.text)
  68
  69 class ListboxToolTip(ToolTipBase):
  70     def __init__(self, button, items):
  71         ToolTipBase.__init__(self, button)
  72         self.items = items
  73     def showcontents(self):
  74         listbox = Listbox(self.tipwindow, background="#ffffe0")
  75         listbox.pack()
  76         for item in self.items:
  77             listbox.insert(END, item)
  78
  79 def main():
  80     # Test code
  81     root = Tk()
  82     b = Button(root, text="Hello", command=root.destroy)
  83     b.pack()
  84     root.update()
  85     tip = ListboxToolTip(b, ["Hello", "world"])
  86     root.mainloop()
  87
  88 if __name__ == '__main__':
  89     main()