##########################################################################
#
#  Copyright (c) 2012, John Haddon. All rights reserved.
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#  met:
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#        the distribution.
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##########################################################################

import imath

import Gaffer
import GafferUI

from Qt import QtCore
from Qt import QtGui

class PopupWindow( GafferUI.Window ) :

	def __init__( self, title = "GafferUI.Window", borderWidth = 8, child = None, **kw ) :

		GafferUI.Window.__init__( self, title, borderWidth, child = child, sizeMode = GafferUI.Window.SizeMode.Automatic, **kw )

		self._qtWidget().setWindowFlags( QtCore.Qt.Popup )
		self._qtWidget().setAttribute( QtCore.Qt.WA_TranslucentBackground )
		self._qtWidget().paintEvent = Gaffer.WeakMethod( self.__paintEvent )

		self.keyPressSignal().connect( Gaffer.WeakMethod( self.__keyPress ), scoped = False )

	def popup( self, center = None ) :

		if center is None :
			center = GafferUI.Widget.mousePosition()

		self.setVisible( True )
		size = self._qtWidget().sizeHint()
		self.setPosition( center - imath.V2i( size.width() / 2, size.height() / 2 ) )

	def __paintEvent( self, event ) :

		painter = QtGui.QPainter( self._qtWidget() )
		painter.setRenderHint( QtGui.QPainter.Antialiasing )

		painter.setBrush( QtGui.QColor( 35, 35, 35 ) )
		painter.setPen( QtGui.QColor( 0, 0, 0, 0 ) )

		radius = self._qtWidget().layout().contentsMargins().left()
		size = self.size()
		painter.drawRoundedRect( QtCore.QRectF( 0, 0, size.x, size.y ), radius, radius )

	def __keyPress( self, widget, event ) :

		if event.key == "Return" :
			self.close()
