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"""
This module contains the smart backspace mode
"""
from pyqode.qt import QtCore, QtGui
from pyqode.core.api import Mode
class SmartBackSpaceMode(Mode):
""" Improves backspace behaviour.
When you press backspace and there are spaces on the left of the cursor,
those spaces will be deleted (at most tab_len spaces).
Basically this turns backspace into Shitf+Tab
"""
def on_state_changed(self, state):
if state:
self.editor.key_pressed.connect(self._on_key_pressed)
else:
self.editor.key_pressed.disconnect(self._on_key_pressed)
def _on_key_pressed(self, event):
no_modifiers = int(event.modifiers()) == QtCore.Qt.NoModifier
if event.key() == QtCore.Qt.Key_Backspace and no_modifiers:
if self.editor.textCursor().atBlockStart():
return
tab_len = self.editor.tab_length
tab_len = self.editor.textCursor().positionInBlock() % tab_len
if tab_len == 0:
tab_len = self.editor.tab_length
# count the number of spaces deletable, stop at tab len
spaces = 0
cursor = QtGui.QTextCursor(self.editor.textCursor())
while spaces < tab_len or cursor.atBlockStart():
pos = cursor.position()
cursor.movePosition(cursor.Left, cursor.KeepAnchor)
char = cursor.selectedText()
if char == " ":
spaces += 1
else:
break
cursor.setPosition(pos - 1)
cursor = self.editor.textCursor()
if spaces == 0:
return
cursor.beginEditBlock()
for _ in range(spaces):
cursor.deletePreviousChar()
cursor.endEditBlock()
self.editor.setTextCursor(cursor)
event.accept()
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