note description: "Screen device context." legal: "See notice at end of class." status: "See notice at end of class." date: "$Date$" revision: "$Revision$" class WEL_SCREEN_DC inherit WEL_DISPLAY_DC redefine destroy_item end feature -- Basic operations get -- Get the device context local a_default_pointer: POINTER do if item = a_default_pointer then item := cwin_get_dc (a_default_pointer) end end release -- Release the device context local a_default_pointer: POINTER do if item /= a_default_pointer then unselect_all cwin_release_dc (a_default_pointer, item) item := a_default_pointer end end quick_release -- Release the device context local a_default_pointer: POINTER do if item /= a_default_pointer then cwin_release_dc (a_default_pointer, item) item := a_default_pointer end end feature {NONE} -- Implementation destroy_item -- Delete the current device context. local a_default_pointer: POINTER -- Default_pointer do -- Protect the call to DeleteDC, because `destroy_item' can -- be called by the GC so without assertions. if item /= a_default_pointer then unselect_all cwin_release_dc (a_default_pointer, item) item := a_default_pointer end end note copyright: "Copyright (c) 1984-2006, Eiffel Software and others" license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)" source: "[ Eiffel Software 356 Storke Road, Goleta, CA 93117 USA Telephone 805-685-1006, Fax 805-685-6869 Website http://www.eiffel.com Customer support http://support.eiffel.com ]" end -- class WEL_SCREEN_DC