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""" A generic Emacs-style kill ring, as well as a Qt-specific version.
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"""
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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# System library imports
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from IPython.external.qt import QtCore, QtGui
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#-----------------------------------------------------------------------------
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# Classes
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#-----------------------------------------------------------------------------
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class KillRing(object):
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""" A generic Emacs-style kill ring.
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"""
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def __init__(self):
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self.clear()
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def clear(self):
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""" Clears the kill ring.
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"""
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self._index = -1
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self._ring = []
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def kill(self, text):
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""" Adds some killed text to the ring.
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"""
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self._ring.append(text)
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def yank(self):
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""" Yank back the most recently killed text.
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Returns
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-------
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A text string or None.
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"""
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self._index = len(self._ring)
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return self.rotate()
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def rotate(self):
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""" Rotate the kill ring, then yank back the new top.
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Returns
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-------
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A text string or None.
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"""
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self._index -= 1
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if self._index >= 0:
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return self._ring[self._index]
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return None
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class QtKillRing(QtCore.QObject):
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""" A kill ring attached to Q[Plain]TextEdit.
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"""
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#--------------------------------------------------------------------------
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# QtKillRing interface
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#--------------------------------------------------------------------------
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def __init__(self, text_edit):
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""" Create a kill ring attached to the specified Qt text edit.
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"""
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assert isinstance(text_edit, (QtGui.QTextEdit, QtGui.QPlainTextEdit))
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super(QtKillRing, self).__init__()
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self._ring = KillRing()
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self._prev_yank = None
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self._skip_cursor = False
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self._text_edit = text_edit
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text_edit.cursorPositionChanged.connect(self._cursor_position_changed)
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def clear(self):
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""" Clears the kill ring.
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"""
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self._ring.clear()
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self._prev_yank = None
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def kill(self, text):
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""" Adds some killed text to the ring.
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"""
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self._ring.kill(text)
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def kill_cursor(self, cursor):
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""" Kills the text selected by the give cursor.
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"""
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text = cursor.selectedText()
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if text:
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cursor.removeSelectedText()
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self.kill(text)
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def yank(self):
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""" Yank back the most recently killed text.
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"""
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text = self._ring.yank()
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if text:
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self._skip_cursor = True
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cursor = self._text_edit.textCursor()
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cursor.insertText(text)
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self._prev_yank = text
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def rotate(self):
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""" Rotate the kill ring, then yank back the new top.
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"""
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if self._prev_yank:
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text = self._ring.rotate()
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if text:
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self._skip_cursor = True
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cursor = self._text_edit.textCursor()
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cursor.movePosition(QtGui.QTextCursor.Left,
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QtGui.QTextCursor.KeepAnchor,
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n = len(self._prev_yank))
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cursor.insertText(text)
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self._prev_yank = text
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#--------------------------------------------------------------------------
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# Protected interface
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#--------------------------------------------------------------------------
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#------ Signal handlers ----------------------------------------------------
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def _cursor_position_changed(self):
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if self._skip_cursor:
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self._skip_cursor = False
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else:
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self._prev_yank = None
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