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"""A simple completer for the qtconsole"""
# Copyright (c) Jupyter Development Team.
# Distributed under the terms of the Modified BSD License.
from qtpy import QtCore, QtGui, QtWidgets
from .util import columnize
class CompletionPlain(QtWidgets.QWidget):
""" A widget for tab completion, navigable by arrow keys """
#--------------------------------------------------------------------------
# 'QObject' interface
#--------------------------------------------------------------------------
def __init__(self, console_widget):
""" Create a completion widget that is attached to the specified Qt
text edit widget.
"""
assert isinstance(console_widget._control, (QtWidgets.QTextEdit, QtWidgets.QPlainTextEdit))
super().__init__()
self._text_edit = console_widget._control
self._console_widget = console_widget
self._text_edit.installEventFilter(self)
def eventFilter(self, obj, event):
""" Reimplemented to handle keyboard input and to auto-hide when the
text edit loses focus.
"""
if obj == self._text_edit:
etype = event.type()
if etype in( QtCore.QEvent.KeyPress, QtCore.QEvent.FocusOut ):
self.cancel_completion()
return super().eventFilter(obj, event)
#--------------------------------------------------------------------------
# 'CompletionPlain' interface
#--------------------------------------------------------------------------
def cancel_completion(self):
"""Cancel the completion, reseting internal variable, clearing buffer """
self._console_widget._clear_temporary_buffer()
def show_items(self, cursor, items, prefix_length=0):
""" Shows the completion widget with 'items' at the position specified
by 'cursor'.
"""
if not items :
return
self.cancel_completion()
strng = columnize(items)
# Move cursor to start of the prefix to replace it
# when a item is selected
cursor.movePosition(QtGui.QTextCursor.Left, n=prefix_length)
self._console_widget._fill_temporary_buffer(cursor, strng, html=False)
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