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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()
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