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#------------------------------------------------------------------------------
#
# Copyright (c) 2005, Enthought, Inc.
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in enthought/LICENSE.txt and may be redistributed only
# under the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
#
# Author: David C. Morrill
# Date: 10/29/2004
#
#------------------------------------------------------------------------------
""" Defines a wxPython ImageControl widget that is used by various trait
editors to display trait values iconically.
"""
#-------------------------------------------------------------------------------
# Imports:
#-------------------------------------------------------------------------------
import wx
#-------------------------------------------------------------------------------
# 'ImageControl' class:
#-------------------------------------------------------------------------------
class ImageControl ( wx.Window ):
""" A wxPython control that displays an image, which can be selected or
unselected by mouse clicks.
"""
# Pens used to draw the 'selection' marker:
_selectedPenDark = wx.Pen(
wx.SystemSettings_GetColour( wx.SYS_COLOUR_3DSHADOW ), 1,
wx.SOLID )
_selectedPenLight = wx.Pen(
wx.SystemSettings_GetColour( wx.SYS_COLOUR_3DHIGHLIGHT ), 1,
wx.SOLID )
#---------------------------------------------------------------------------
# Initializes the object:
#---------------------------------------------------------------------------
def __init__ ( self, parent, bitmap, selected = None, handler = None,
padding = 10 ):
""" Initializes the object.
"""
wx.Window.__init__( self, parent, -1,
size = wx.Size( bitmap.GetWidth() + padding,
bitmap.GetHeight() + padding ) )
self._bitmap = bitmap
self._selected = selected
self._handler = handler
self._mouse_over = False
self._button_down = False
# Set up the 'paint' event handler:
wx.EVT_PAINT( self, self._on_paint )
# Set up mouse event handlers:
wx.EVT_LEFT_DOWN( self, self._on_left_down )
wx.EVT_LEFT_UP( self, self._on_left_up )
wx.EVT_ENTER_WINDOW( self, self._on_enter )
wx.EVT_LEAVE_WINDOW( self, self._on_leave )
#---------------------------------------------------------------------------
# Gets/Sets the current selection state of the image:
#---------------------------------------------------------------------------
def Selected ( self, selected = None ):
""" Gets or sets the selection state of the image.
"""
if selected is not None:
selected = (selected != 0)
if selected != self._selected:
if selected:
for control in self.GetParent().GetChildren():
if (isinstance( control, ImageControl ) and
control.Selected()):
control.Selected( False )
break
self._selected = selected
self.Refresh()
return self._selected
#---------------------------------------------------------------------------
# Gets/Sets the current bitmap image:
#---------------------------------------------------------------------------
def Bitmap ( self, bitmap = None ):
""" Gets or sets the bitmap image.
"""
if bitmap is not None:
if bitmap != self._bitmap:
self._bitmap = bitmap
self.Refresh()
return self._bitmap
#---------------------------------------------------------------------------
# Gets/Sets the current click handler:
#---------------------------------------------------------------------------
def Handler ( self, handler = None ):
""" Gets or sets the click handler.
"""
if handler is not None:
if handler != self._handler:
self._handler = handler
self.Refresh()
return self._handler
#---------------------------------------------------------------------------
# Handles the mouse entering the control:
#---------------------------------------------------------------------------
def _on_enter ( self, event = None ):
""" Handles the mouse entering the control.
"""
if self._selected is not None:
self._mouse_over = True
self.Refresh()
#---------------------------------------------------------------------------
# Handles the mouse leaving the control:
#---------------------------------------------------------------------------
def _on_leave ( self, event = None ):
""" Handles the mouse leaving the control.
"""
if self._mouse_over:
self._mouse_over = False
self.Refresh()
#---------------------------------------------------------------------------
# Handles the user pressing the mouse button:
#---------------------------------------------------------------------------
def _on_left_down ( self, event = None ):
""" Handles the user pressing the mouse button.
"""
if self._selected is not None:
self.CaptureMouse()
self._button_down = True
self.Refresh()
#---------------------------------------------------------------------------
# Handles the user clicking the control:
#---------------------------------------------------------------------------
def _on_left_up ( self, event = None ):
""" Handles the user clicking the control.
"""
need_refresh = self._button_down
if need_refresh:
self.ReleaseMouse()
self._button_down = False
if self._selected is not None:
wdx, wdy = self.GetClientSizeTuple()
x = event.GetX()
y = event.GetY()
if (0 <= x < wdx) and (0 <= y < wdy):
if self._selected != -1:
self.Selected( True )
elif need_refresh:
self.Refresh()
if self._handler is not None:
self._handler( self )
return
if need_refresh:
self.Refresh()
#---------------------------------------------------------------------------
# Handles the control being re-painted:
#---------------------------------------------------------------------------
def _on_paint ( self, event = None ):
""" Handles the control being re-painted.
"""
wdc = wx.PaintDC( self )
wdx, wdy = self.GetClientSizeTuple()
bitmap = self._bitmap
bdx = bitmap.GetWidth()
bdy = bitmap.GetHeight()
wdc.DrawBitmap( bitmap, (wdx - bdx) / 2, (wdy - bdy) / 2, True )
pens = [ self._selectedPenLight, self._selectedPenDark ]
bd = self._button_down
if self._mouse_over:
wdc.SetBrush( wx.TRANSPARENT_BRUSH )
wdc.SetPen( pens[ bd ] )
wdc.DrawLine( 0, 0, wdx, 0 )
wdc.DrawLine( 0, 1, 0, wdy )
wdc.SetPen( pens[ 1 - bd ] )
wdc.DrawLine( wdx - 1, 1, wdx - 1, wdy )
wdc.DrawLine( 1, wdy - 1, wdx - 1, wdy - 1 )
if self._selected is True:
wdc.SetBrush( wx.TRANSPARENT_BRUSH )
wdc.SetPen( pens[ bd ] )
wdc.DrawLine( 1, 1, wdx - 1, 1 )
wdc.DrawLine( 1, 1, 1, wdy - 1 )
wdc.DrawLine( 2, 2, wdx - 2, 2 )
wdc.DrawLine( 2, 2, 2, wdy - 2 )
wdc.SetPen( pens[ 1 - bd ] )
wdc.DrawLine( wdx - 2, 2, wdx - 2, wdy - 1 )
wdc.DrawLine( 2, wdy - 2, wdx - 2, wdy - 2 )
wdc.DrawLine( wdx - 3, 3, wdx - 3, wdy - 2 )
wdc.DrawLine( 3, wdy - 3, wdx - 3, wdy - 3 )
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