202 lines
7.0 KiB
Python
202 lines
7.0 KiB
Python
"""A call-tip window class for Tkinter/IDLE.
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After tooltip.py, which uses ideas gleaned from PySol.
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Used by calltip.py.
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"""
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from tkinter import Label, LEFT, SOLID, TclError
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from idlelib.tooltip import TooltipBase
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HIDE_EVENT = "<<calltipwindow-hide>>"
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HIDE_SEQUENCES = ("<Key-Escape>", "<FocusOut>")
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CHECKHIDE_EVENT = "<<calltipwindow-checkhide>>"
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CHECKHIDE_SEQUENCES = ("<KeyRelease>", "<ButtonRelease>")
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CHECKHIDE_TIME = 100 # milliseconds
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MARK_RIGHT = "calltipwindowregion_right"
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class CalltipWindow(TooltipBase):
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"""A call-tip widget for tkinter text widgets."""
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def __init__(self, text_widget):
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"""Create a call-tip; shown by showtip().
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text_widget: a Text widget with code for which call-tips are desired
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"""
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# Note: The Text widget will be accessible as self.anchor_widget
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super(CalltipWindow, self).__init__(text_widget)
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self.label = self.text = None
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self.parenline = self.parencol = self.lastline = None
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self.hideid = self.checkhideid = None
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self.checkhide_after_id = None
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def get_position(self):
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"""Choose the position of the call-tip."""
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curline = int(self.anchor_widget.index("insert").split('.')[0])
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if curline == self.parenline:
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anchor_index = (self.parenline, self.parencol)
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else:
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anchor_index = (curline, 0)
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box = self.anchor_widget.bbox("%d.%d" % anchor_index)
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if not box:
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box = list(self.anchor_widget.bbox("insert"))
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# align to left of window
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box[0] = 0
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box[2] = 0
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return box[0] + 2, box[1] + box[3]
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def position_window(self):
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"Reposition the window if needed."
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curline = int(self.anchor_widget.index("insert").split('.')[0])
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if curline == self.lastline:
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return
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self.lastline = curline
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self.anchor_widget.see("insert")
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super(CalltipWindow, self).position_window()
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def showtip(self, text, parenleft, parenright):
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"""Show the call-tip, bind events which will close it and reposition it.
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text: the text to display in the call-tip
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parenleft: index of the opening parenthesis in the text widget
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parenright: index of the closing parenthesis in the text widget,
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or the end of the line if there is no closing parenthesis
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"""
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# Only called in calltip.Calltip, where lines are truncated
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self.text = text
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if self.tipwindow or not self.text:
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return
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self.anchor_widget.mark_set(MARK_RIGHT, parenright)
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self.parenline, self.parencol = map(
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int, self.anchor_widget.index(parenleft).split("."))
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super(CalltipWindow, self).showtip()
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self._bind_events()
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def showcontents(self):
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"""Create the call-tip widget."""
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self.label = Label(self.tipwindow, text=self.text, justify=LEFT,
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background="#ffffd0", foreground="black",
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relief=SOLID, borderwidth=1,
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font=self.anchor_widget['font'])
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self.label.pack()
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def checkhide_event(self, event=None):
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"""Handle CHECK_HIDE_EVENT: call hidetip or reschedule."""
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if not self.tipwindow:
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# If the event was triggered by the same event that unbound
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# this function, the function will be called nevertheless,
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# so do nothing in this case.
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return None
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# Hide the call-tip if the insertion cursor moves outside of the
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# parenthesis.
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curline, curcol = map(int, self.anchor_widget.index("insert").split('.'))
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if curline < self.parenline or \
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(curline == self.parenline and curcol <= self.parencol) or \
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self.anchor_widget.compare("insert", ">", MARK_RIGHT):
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self.hidetip()
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return "break"
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# Not hiding the call-tip.
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self.position_window()
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# Re-schedule this function to be called again in a short while.
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if self.checkhide_after_id is not None:
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self.anchor_widget.after_cancel(self.checkhide_after_id)
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self.checkhide_after_id = \
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self.anchor_widget.after(CHECKHIDE_TIME, self.checkhide_event)
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return None
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def hide_event(self, event):
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"""Handle HIDE_EVENT by calling hidetip."""
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if not self.tipwindow:
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# See the explanation in checkhide_event.
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return None
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self.hidetip()
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return "break"
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def hidetip(self):
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"""Hide the call-tip."""
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if not self.tipwindow:
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return
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try:
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self.label.destroy()
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except TclError:
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pass
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self.label = None
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self.parenline = self.parencol = self.lastline = None
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try:
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self.anchor_widget.mark_unset(MARK_RIGHT)
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except TclError:
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pass
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try:
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self._unbind_events()
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except (TclError, ValueError):
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# ValueError may be raised by MultiCall
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pass
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super(CalltipWindow, self).hidetip()
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def _bind_events(self):
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"""Bind event handlers."""
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self.checkhideid = self.anchor_widget.bind(CHECKHIDE_EVENT,
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self.checkhide_event)
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for seq in CHECKHIDE_SEQUENCES:
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self.anchor_widget.event_add(CHECKHIDE_EVENT, seq)
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self.anchor_widget.after(CHECKHIDE_TIME, self.checkhide_event)
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self.hideid = self.anchor_widget.bind(HIDE_EVENT,
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self.hide_event)
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for seq in HIDE_SEQUENCES:
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self.anchor_widget.event_add(HIDE_EVENT, seq)
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def _unbind_events(self):
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"""Unbind event handlers."""
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for seq in CHECKHIDE_SEQUENCES:
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self.anchor_widget.event_delete(CHECKHIDE_EVENT, seq)
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self.anchor_widget.unbind(CHECKHIDE_EVENT, self.checkhideid)
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self.checkhideid = None
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for seq in HIDE_SEQUENCES:
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self.anchor_widget.event_delete(HIDE_EVENT, seq)
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self.anchor_widget.unbind(HIDE_EVENT, self.hideid)
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self.hideid = None
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def _calltip_window(parent): # htest #
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from tkinter import Toplevel, Text, LEFT, BOTH
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top = Toplevel(parent)
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top.title("Test call-tips")
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x, y = map(int, parent.geometry().split('+')[1:])
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top.geometry("250x100+%d+%d" % (x + 175, y + 150))
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text = Text(top)
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text.pack(side=LEFT, fill=BOTH, expand=1)
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text.insert("insert", "string.split")
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top.update()
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calltip = CalltipWindow(text)
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def calltip_show(event):
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calltip.showtip("(s='Hello world')", "insert", "end")
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def calltip_hide(event):
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calltip.hidetip()
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text.event_add("<<calltip-show>>", "(")
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text.event_add("<<calltip-hide>>", ")")
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text.bind("<<calltip-show>>", calltip_show)
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text.bind("<<calltip-hide>>", calltip_hide)
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text.focus_set()
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if __name__ == '__main__':
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from unittest import main
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main('idlelib.idle_test.test_calltip_w', verbosity=2, exit=False)
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from idlelib.idle_test.htest import run
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run(_calltip_window)
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