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Fix race condition in javascript kernel message processing...
Fix race condition in javascript kernel message processing Because the binary messages are now deserialized using the asynchronous FileReader API, we need to have some way to force the messages to still be processed in the order they are received. This patch implements a simple processing queue using promises.

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completion_widget.py
139 lines | 5.2 KiB | text/x-python | PythonLexer
"""A dropdown completer widget for the qtconsole."""
# System library imports
from IPython.external.qt import QtCore, QtGui
class CompletionWidget(QtGui.QListWidget):
""" A widget for GUI tab completion.
"""
#--------------------------------------------------------------------------
# 'QObject' interface
#--------------------------------------------------------------------------
def __init__(self, console_widget):
""" Create a completion widget that is attached to the specified Qt
text edit widget.
"""
text_edit = console_widget._control
assert isinstance(text_edit, (QtGui.QTextEdit, QtGui.QPlainTextEdit))
super(CompletionWidget, self).__init__()
self._text_edit = text_edit
self.setAttribute(QtCore.Qt.WA_StaticContents)
self.setWindowFlags(QtCore.Qt.ToolTip | QtCore.Qt.WindowStaysOnTopHint)
# Ensure that the text edit keeps focus when widget is displayed.
self.setFocusProxy(self._text_edit)
self.setFrameShadow(QtGui.QFrame.Plain)
self.setFrameShape(QtGui.QFrame.StyledPanel)
self.itemActivated.connect(self._complete_current)
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 == QtCore.QEvent.KeyPress:
key, text = event.key(), event.text()
if key in (QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter,
QtCore.Qt.Key_Tab):
self._complete_current()
return True
elif key == QtCore.Qt.Key_Escape:
self.hide()
return True
elif key in (QtCore.Qt.Key_Up, QtCore.Qt.Key_Down,
QtCore.Qt.Key_PageUp, QtCore.Qt.Key_PageDown,
QtCore.Qt.Key_Home, QtCore.Qt.Key_End):
self.keyPressEvent(event)
return True
elif etype == QtCore.QEvent.FocusOut:
self.hide()
return super(CompletionWidget, self).eventFilter(obj, event)
#--------------------------------------------------------------------------
# 'QWidget' interface
#--------------------------------------------------------------------------
def hideEvent(self, event):
""" Reimplemented to disconnect signal handlers and event filter.
"""
super(CompletionWidget, self).hideEvent(event)
self._text_edit.cursorPositionChanged.disconnect(self._update_current)
self._text_edit.removeEventFilter(self)
def showEvent(self, event):
""" Reimplemented to connect signal handlers and event filter.
"""
super(CompletionWidget, self).showEvent(event)
self._text_edit.cursorPositionChanged.connect(self._update_current)
self._text_edit.installEventFilter(self)
#--------------------------------------------------------------------------
# 'CompletionWidget' interface
#--------------------------------------------------------------------------
def show_items(self, cursor, items):
""" Shows the completion widget with 'items' at the position specified
by 'cursor'.
"""
text_edit = self._text_edit
point = text_edit.cursorRect(cursor).bottomRight()
point = text_edit.mapToGlobal(point)
height = self.sizeHint().height()
screen_rect = QtGui.QApplication.desktop().availableGeometry(self)
if screen_rect.size().height() - point.y() - height < 0:
point = text_edit.mapToGlobal(text_edit.cursorRect().topRight())
point.setY(point.y() - height)
self.move(point)
self._start_position = cursor.position()
self.clear()
self.addItems(items)
self.setCurrentRow(0)
self.show()
#--------------------------------------------------------------------------
# Protected interface
#--------------------------------------------------------------------------
def _complete_current(self):
""" Perform the completion with the currently selected item.
"""
self._current_text_cursor().insertText(self.currentItem().text())
self.hide()
def _current_text_cursor(self):
""" Returns a cursor with text between the start position and the
current position selected.
"""
cursor = self._text_edit.textCursor()
if cursor.position() >= self._start_position:
cursor.setPosition(self._start_position,
QtGui.QTextCursor.KeepAnchor)
return cursor
def _update_current(self):
""" Updates the current item based on the current text.
"""
prefix = self._current_text_cursor().selection().toPlainText()
if prefix:
items = self.findItems(prefix, (QtCore.Qt.MatchStartsWith |
QtCore.Qt.MatchCaseSensitive))
if items:
self.setCurrentItem(items[0])
else:
self.hide()
else:
self.hide()
def cancel_completion(self):
self.hide()