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# Copyright 2008 Nanorex, Inc. See LICENSE file for details.
"""
JoinStrands_By_DND_RequestCommand
This is a request command called whenever a user wants to join two strands by
drag and drop. (DND = Drag and Drop). During singletLeftDown of the current
graphicsMode, it calls this request command and then during left up, this
request command is exited.
@author: Ninad
@copyright: 2008 Nanorex, Inc. See LICENSE file for details.
@version:$Id$
History:
Created to fix this bug reported by Mark:
1. Insert DNA.
2. Nick one of the strands using "Break Strands"
3. Heal nick using "Join Strands" (using drag-and-drop). This causes
the premature exit from "Join Strands".
TODO:
"""
from utilities.constants import CL_REQUEST
from dna.commands.JoinStrands.JoinStrands_GraphicsMode import JoinStrands_GraphicsMode
from dna.commands.JoinStrands.JoinStrands_Command import JoinStrands_Command
class JoinStrands_By_DND_RequestCommand(JoinStrands_Command):
"""
Example: In this BuildDna_EditCommand (graphicsMode), if you want to
join two strands, upon 'singletLeftDown' it enters
JoinStrands_Command , also calling leftDown method of its graphicsmode.
Now, when user releases theLMB, it calls
JoinStrands_GraphicsMode.leftUp() which in turn exits that command
if the flag 'exit_command_on_leftUp' is set to True(to go back to the
previous command user was in) .
A lot of code that does bondpoint dragging is available in
BuildAtoms_GraphicsMode, but it isn't in BuildDna_GraphicsMode
(as it is a SelectChunks_GraphicsMode superclass for lots of reasons)
So, for some significant amount of time, we may continue to use
this flag to temporarily enter/exit this command.
@see: BuildDna_GraphicsMode.singletLeftDown()
@see: ClickToJoinStrands_GraphicsMode.
"""
command_level = CL_REQUEST
commandName = 'JoinStrands_By_DND'
featurename = 'JoinStrands By DND RequestCommand'
GraphicsMode_class = JoinStrands_GraphicsMode
command_should_resume_prevMode = True
command_has_its_own_PM = False
pass
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