cola/qtcompat.py

   1 from __future__ import division, absolute_import, unicode_literals
   2
   3 from qtpy import PYQT4
   4 from qtpy import QtCore
   5 from qtpy import QtGui
   6 from qtpy import QtWidgets
   7 from qtpy.QtCore import Qt
   8
   9 from . import hotkeys
  10
  11
  12 def patch(obj, attr, value):
  13     if not hasattr(obj, attr):
  14         setattr(obj, attr, value)
  15
  16
  17 def install():
  18     patch(QtWidgets.QGraphicsItem, 'mapRectToScene', _map_rect_to_scene)
  19     patch(QtGui.QKeySequence, 'Preferences', hotkeys.PREFERENCES)
  20
  21
  22 def add_search_path(prefix, path):
  23     if hasattr(QtCore.QDir, 'addSearchPath'):
  24         QtCore.QDir.addSearchPath(prefix, path)
  25
  26
  27 def set_common_dock_options(window):
  28     if not hasattr(window, 'setDockOptions'):
  29         return
  30     nested = QtWidgets.QMainWindow.AllowNestedDocks
  31     tabbed = QtWidgets.QMainWindow.AllowTabbedDocks
  32     animated = QtWidgets.QMainWindow.AnimatedDocks
  33     window.setDockOptions(nested | tabbed | animated)
  34
  35
  36 def _map_rect_to_scene(self, rect):
  37     """Only available in newer PyQt4 versions"""
  38     return self.sceneTransform().mapRect(rect)
  39
  40
  41 def wheel_translation(event):
  42     """Return the Tx Ty translation delta for a pan"""
  43     if PYQT4:
  44         tx = event.delta()
  45         ty = 0.0
  46         if event.orientation() == Qt.Vertical:
  47             (tx, ty) = (ty, tx)
  48     else:
  49         angle = event.angleDelta()
  50         tx = angle.x()
  51         ty = angle.y()
  52     return (tx, ty)
  53
  54
  55 def wheel_delta(event):
  56     """Return a single wheel delta"""
  57     if PYQT4:
  58         delta = event.delta()
  59     else:
  60         angle = event.angleDelta()
  61         x = angle.x()
  62         y = angle.y()
  63         if abs(x) > abs(y):
  64             delta = x
  65         else:
  66             delta = y
  67     return delta