# general purpose 'tooltip' routines - currently unused in idlefork

# (although the 'calltips' extension is partly based on this code)

# may be useful for some purposes in (or almost in ;) the current project scope

# Ideas gleaned from PySol

from Tkinter import *

class ToolTipBase:

    def __init__(self, button):

        self.button = button

        self.tipwindow = None

        self.id = None

        self.x = self.y = 0

        self._id1 = self.button.bind("<Enter>", self.enter)

        self._id2 = self.button.bind("<Leave>", self.leave)

        self._id3 = self.button.bind("<ButtonPress>", self.leave)

    def enter(self, event=None):

        self.schedule()

    def leave(self, event=None):

        self.unschedule()

        self.hidetip()

    def schedule(self):

        self.unschedule()

        self.id = self.button.after(1500, self.showtip)

    def unschedule(self):

        id = self.id

        self.id = None

        if id:

            self.button.after_cancel(id)

    def showtip(self):

        if self.tipwindow:

            return

        # The tip window must be completely outside the button;

        # otherwise when the mouse enters the tip window we get

        # a leave event and it disappears, and then we get an enter

        # event and it reappears, and so on forever :-(

        x = self.button.winfo_rootx() + 20

        y = self.button.winfo_rooty() + self.button.winfo_height() + 1

        self.tipwindow = tw = Toplevel(self.button)

        tw.wm_overrideredirect(1)

        tw.wm_geometry("+%d+%d" % (x, y))

        self.showcontents()

    def showcontents(self, text="Your text here"):

        # Override this in derived class

        label = Label(self.tipwindow, text=text, justify=LEFT,

                      background="#ffffe0", relief=SOLID, borderwidth=1)

        label.pack()

    def hidetip(self):

        tw = self.tipwindow

        self.tipwindow = None

        if tw:

            tw.destroy()

class ToolTip(ToolTipBase):

    def __init__(self, button, text):

        ToolTipBase.__init__(self, button)

        self.text = text

    def showcontents(self):

        ToolTipBase.showcontents(self, self.text)

class ListboxToolTip(ToolTipBase):

    def __init__(self, button, items):

        ToolTipBase.__init__(self, button)

        self.items = items

    def showcontents(self):

        listbox = Listbox(self.tipwindow, background="#ffffe0")

        listbox.pack()

        for item in self.items:

            listbox.insert(END, item)

def main():

    # Test code

    root = Tk()

    b = Button(root, text="Hello", command=root.destroy)

    b.pack()

    root.update()

    tip = ListboxToolTip(b, ["Hello", "world"])

    root.mainloop()

if __name__ == '__main__':

    main()