text: # -*- coding: utf-8 -*-
  
  # standard library
  import logging
  # local library
  from gr.pygr.base import GRViewPort
  from qtgr.backend import QtCore
  from qtgr.events.base import MouseLocationEventMeta
  from gr import __version__, __revision__
  
  __author__ = "Christian Felder <c.felder@fz-juelich.de>"
  __copyright__ = """Copyright (c) 2012-2015: Josef Heinen, Florian Rhiem,
  Christian Felder, and other contributors:
  
  http://gr-framework.org/credits.html
  
  Permission is hereby granted, free of charge, to any person obtaining
  a copy of this software and associated documentation files (the
  "Software"), to deal in the Software without restriction, including
  without limitation the rights to use, copy, modify, merge, publish,
  distribute, sublicense, and/or sell copies of the Software, and to
  permit persons to whom the Software is furnished to do so, subject to
  the following conditions:
  
  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  """
  
  _log = logging.getLogger(__name__)
  
  
  class MouseEvent(MouseLocationEventMeta):
  
      MOUSE_MOVE = QtCore.QEvent.registerEventType()
      MOUSE_PRESS = QtCore.QEvent.registerEventType()
      MOUSE_RELEASE = QtCore.QEvent.registerEventType()
  
      NO_BUTTON = 0x0
      LEFT_BUTTON = 0x1
      RIGHT_BUTTON = 0x2
  
      NO_MODIFIER = 0x00
      SHIFT_MODIFIER = 0x02
      CONTROL_MODIFIER = 0x04
      ALT_MODIFIER = 0x08
      META_MODIFIER = 0x10
      KEYPAD_MODIFIER = 0x20
      GROUP_SWITCH_MODIFIER = 0x40
  
      def __init__(self, type, width, height, x, y, buttons, modifiers,
                   window=None, scale=None):
          super(MouseEvent, self).__init__(type, width, height, x, y,
                                           window=window, scale=scale)
          self._buttons = buttons
          self._modifiers = modifiers
  
      def type(self):
          return self._type
  
      def getButtons(self):
          return self._buttons
  
      def getModifiers(self):
          return self._modifiers
  
  
  class WheelEvent(MouseLocationEventMeta):
  
      WHEEL_MOVE = QtCore.QEvent.registerEventType()
  
      def __init__(self, type, width, height, x, y, buttons, delta):
          super(WheelEvent, self).__init__(type, width, height, x, y)
          self._buttons = buttons
          self._delta = delta
  
      def getDelta(self):
          return self._delta
  
      def getDegree(self):
          return self.getDelta() / 8.
  
      def getSteps(self):
          return self.getDegree() / 15.
  
      def getButtons(self):
          return self._buttons
  
  
  class PickEvent(MouseLocationEventMeta, GRViewPort):
  
      PICK_MOVE = QtCore.QEvent.registerEventType()
      PICK_PRESS = QtCore.QEvent.registerEventType()
  
      def __init__(self, type, width, height, x, y, viewport, window=None,
                   scale=None, sizex=1., sizey=1.):
          super(PickEvent, self).__init__(type, width, height, x, y,
                                          window=window, scale=scale)
          GRViewPort.__init__(self, viewport, sizex, sizey)
  
  
  class ROIEvent(MouseEvent):
  
      ROI_CLICKED = QtCore.QEvent.registerEventType()
      ROI_OVER = QtCore.QEvent.registerEventType()
  
      def __init__(self, type, width, height, x, y, buttons, modifiers, roi):
          super(ROIEvent, self).__init__(type, width, height, x, y, buttons,
                                         modifiers)
          self._roi = roi
  
      @property
      def roi(self):
          """Get RegionOfInterest instance."""
          return self._roi
  
  
  class LegendEvent(ROIEvent):
  
      def __init__(self, type, width, height, x, y, buttons, modifiers, roi):
          super(LegendEvent, self).__init__(type, width, height, x, y, buttons,
                                            modifiers, roi)
  
      @property
      def curve(self):
          """Get PlotCurve instance referenced by this legend item."""
          return self._roi.reference
  
  
  class MouseGestureEvent(MouseEvent):
  
      MOUSE_PAN = QtCore.QEvent.registerEventType()
      MOUSE_SELECT = QtCore.QEvent.registerEventType()
  
      def __init__(self, type, width, height, x, y, buttons, modifiers, offset,
                   finish=None):
          MouseEvent.__init__(self, type, width, height, x, y, buttons, modifiers)
          self._offset = offset
          self._finish = finish
  
      def getOffset(self):
          """Get current offset in NDC space."""
          return self._offset
  
      def isFinished(self):
          return self._finish
  