git.maemo.org Git - gonvert/blob - gonvert/util/qml_utils.py

   1 #!/usr/bin/env python
   2
   3 """
   4 QML Tips:
   5         Large images:
   6                 QML asynchronous = true; cache = false; [1]
   7         Insert properties at top of element declarations [1]
   8         Non-visible items: set opacity to 0 [2]
   9         Use Loader [1]
  10         Keep QML files small [1]
  11
  12 [1] http://sf2011.meego.com/program/sessions/performance-tips-and-tricks-qtqml-applications-0
  13 [2] http://doc.qt.nokia.com/4.7/qdeclarativeperformance.html
  14 """
  15
  16 from __future__ import with_statement
  17 from __future__ import division
  18
  19 import logging
  20
  21 import util.qt_compat as qt_compat
  22 QtCore = qt_compat.QtCore
  23 QtGui = qt_compat.import_module("QtGui")
  24 QtDeclarative = qt_compat.import_module("QtDeclarative")
  25
  26
  27 _moduleLogger = logging.getLogger(__name__)
  28
  29
  30 class DeclarativeView(QtDeclarative.QDeclarativeView):
  31
  32         def __init__(self):
  33                 QtDeclarative.QDeclarativeView.__init__(self)
  34
  35         closing = qt_compat.Signal()
  36
  37         def closeEvent(self, event):
  38                 self.closing.emit()
  39                 event.ignore()
  40
  41
  42 def disable_default_window_painting(view):
  43         """
  44         See http://doc.qt.nokia.com/4.7-snapshot/qdeclarativeperformance.html
  45         """
  46         view.setAttribute(QtCore.Qt.WA_OpaquePaintEvent)
  47         view.setAttribute(QtCore.Qt.WA_NoSystemBackground)
  48         view.viewport().setAttribute(QtCore.Qt.WA_OpaquePaintEvent)
  49         view.viewport().setAttribute(QtCore.Qt.WA_NoSystemBackground)
  50
  51
  52 if __name__ == "__main__":
  53         pass
  54