cola/qtcompat.py

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