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import unittest

import GafferTest
import GafferUI

class SliderTest( unittest.TestCase ) :

	def testConstructor( self ) :
	
		s = GafferUI.Slider()
		self.assertEqual( s.getPosition(), 0.5 )
		self.assertEqual( s.getPositions(), [ 0.5 ] )
		
		s = GafferUI.Slider( position = 1 )
		self.assertEqual( s.getPosition(), 1 )
		self.assertEqual( s.getPositions(), [ 1 ] )
		
		s = GafferUI.Slider( positions = [ 0, 1 ] )
		self.assertRaises( ValueError, s.getPosition )
		self.assertEqual( s.getPositions(), [ 0, 1 ] )
		
		self.assertRaises( Exception, GafferUI.Slider, position = 1, positions = [ 1, 2 ] )
	
	def testPositionAccessors( self ) :
	
		s = GafferUI.Slider( position = 1 )
		
		self.assertEqual( s.getPosition(), 1 )
		self.assertEqual( s.getPositions(), [ 1 ] )
		
		s.setPosition( 2 )
		
		self.assertEqual( s.getPosition(), 2 )
		self.assertEqual( s.getPositions(), [ 2 ] )
		
		s.setPositions( [ 2, 3 ] )

		self.assertRaises( ValueError, s.getPosition )
		self.assertEqual( s.getPositions(), [ 2, 3 ] )
	
	def testSelectedIndex( self ) :
	
		s = GafferUI.Slider( positions = [ 1, 2 ] )		
		self.assertEqual( s.getSelectedIndex(), None )
		
		s.setSelectedIndex( 0 )
		self.assertEqual( s.getSelectedIndex(), 0 )
		s.setSelectedIndex( 1 )
		self.assertEqual( s.getSelectedIndex(), 1 )
		
		self.assertRaises( IndexError, s.setSelectedIndex, -1 )
		self.assertRaises( IndexError, s.setSelectedIndex, 2 )
		
		s.setSelectedIndex( None )
		self.assertEqual( s.getSelectedIndex(), None )
		
		cs = GafferTest.CapturingSlot( s.selectedIndexChangedSignal() )
		
		s.setSelectedIndex( 1 )
		self.assertEqual( len( cs ), 1 )
		self.assertTrue( cs[0][0] is s )
		
		s.setSelectedIndex( 1 )
		self.assertEqual( len( cs ), 1 )
		self.assertTrue( cs[0][0] is s )

		s.setSelectedIndex( 0 )
		self.assertEqual( len( cs ), 2 )
		self.assertTrue( cs[0][0] is s )
		self.assertTrue( cs[1][0] is s )
		
if __name__ == "__main__":
	unittest.main()
