As yet unused code for tool tips.

Tools/idle/ToolTip.py

@@ -0,0 +1,87 @@
+# Ideas gleaned from PySol
+
+import os
+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() # not in idle
+
+main()