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"""A CallTip window class for Tkinter/IDLE. After ToolTip.py, which uses ideas gleaned from PySol Used by the CallTips IDLE extension. """ from Tkinter import * HIDE_VIRTUAL_EVENT_NAME = "<<calltipwindow-hide>>" HIDE_SEQUENCES = ("<Key-Escape>", "<FocusOut>") CHECKHIDE_VIRTUAL_EVENT_NAME = "<<calltipwindow-checkhide>>" CHECKHIDE_SEQUENCES = ("<KeyRelease>", "<ButtonRelease>") CHECKHIDE_TIME = 100 # miliseconds MARK_RIGHT = "calltipwindowregion_right" class CallTip: def __init__(self, widget): self.widget = widget self.tipwindow = self.label = None self.parenline = self.parencol = None self.lastline = None self.hideid = self.checkhideid = None self.checkhide_after_id = None def position_window(self): """Check if needs to reposition the window, and if so - do it.""" curline = int(self.widget.index("insert").split('.')[0]) if curline == self.lastline: return self.lastline = curline self.widget.see("insert") if curline == self.parenline: box = self.widget.bbox("%d.%d" % (self.parenline, self.parencol)) else: box = self.widget.bbox("%d.0" % curline) if not box: box = list(self.widget.bbox("insert")) # align to left of window box[0] = 0 box[2] = 0 x = box[0] + self.widget.winfo_rootx() + 2 y = box[1] + box[3] + self.widget.winfo_rooty() self.tipwindow.wm_geometry("+%d+%d" % (x, y)) def showtip(self, text, parenleft, parenright): """Show the calltip, bind events which will close it and reposition it. """ # truncate overly long calltip if len(text) >= 79: textlines = text.splitlines() for i, line in enumerate(textlines): if len(line) > 79: textlines[i] = line[:75] + ' ...' text = '\n'.join(textlines) self.text = text if self.tipwindow or not self.text: return self.widget.mark_set(MARK_RIGHT, parenright) self.parenline, self.parencol = map( int, self.widget.index(parenleft).split(".")) self.tipwindow = tw = Toplevel(self.widget) self.position_window() # remove border on calltip window tw.wm_overrideredirect(1) try: # This command is only needed and available on Tk >= 8.4.0 for OSX # Without it, call tips intrude on the typing process by grabbing # the focus. tw.tk.call("::tk::unsupported::MacWindowStyle", "style", tw._w, "help", "noActivates") except TclError: pass self.label = Label(tw, text=self.text, justify=LEFT, background="#ffffe0", relief=SOLID, borderwidth=1, font = self.widget['font']) self.label.pack() self.checkhideid = self.widget.bind(CHECKHIDE_VIRTUAL_EVENT_NAME, self.checkhide_event) for seq in CHECKHIDE_SEQUENCES: self.widget.event_add(CHECKHIDE_VIRTUAL_EVENT_NAME, seq) self.widget.after(CHECKHIDE_TIME, self.checkhide_event) self.hideid = self.widget.bind(HIDE_VIRTUAL_EVENT_NAME, self.hide_event) for seq in HIDE_SEQUENCES: self.widget.event_add(HIDE_VIRTUAL_EVENT_NAME, seq) def checkhide_event(self, event=None): if not self.tipwindow: # If the event was triggered by the same event that unbinded # this function, the function will be called nevertheless, # so do nothing in this case. return curline, curcol = map(int, self.widget.index("insert").split('.')) if curline < self.parenline or \ (curline == self.parenline and curcol <= self.parencol) or \ self.widget.compare("insert", ">", MARK_RIGHT): self.hidetip() else: self.position_window() if self.checkhide_after_id is not None: self.widget.after_cancel(self.checkhide_after_id) self.checkhide_after_id = \ self.widget.after(CHECKHIDE_TIME, self.checkhide_event) def hide_event(self, event): if not self.tipwindow: # See the explanation in checkhide_event. return self.hidetip() def hidetip(self): if not self.tipwindow: return for seq in CHECKHIDE_SEQUENCES: self.widget.event_delete(CHECKHIDE_VIRTUAL_EVENT_NAME, seq) self.widget.unbind(CHECKHIDE_VIRTUAL_EVENT_NAME, self.checkhideid) self.checkhideid = None for seq in HIDE_SEQUENCES: self.widget.event_delete(HIDE_VIRTUAL_EVENT_NAME, seq) self.widget.unbind(HIDE_VIRTUAL_EVENT_NAME, self.hideid) self.hideid = None self.label.destroy() self.label = None self.tipwindow.destroy() self.tipwindow = None self.widget.mark_unset(MARK_RIGHT) self.parenline = self.parencol = self.lastline = None def is_active(self): return bool(self.tipwindow) ############################### # # Test Code # class container: # Conceptually an editor_window def __init__(self): root = Tk() text = self.text = Text(root) text.pack(side=LEFT, fill=BOTH, expand=1) text.insert("insert", "string.split") root.update() self.calltip = CallTip(text) text.event_add("<<calltip-show>>", "(") text.event_add("<<calltip-hide>>", ")") text.bind("<<calltip-show>>", self.calltip_show) text.bind("<<calltip-hide>>", self.calltip_hide) text.focus_set() root.mainloop() def calltip_show(self, event): self.calltip.showtip("Hello world") def calltip_hide(self, event): self.calltip.hidetip() def main(): # Test code c=container() if __name__=='__main__': main()