import os

import sys

import threading

import urllib

from PyQt4 import QtCore

from PyQt4 import QtGui

from PyQt4.QtCore import (Qt, SIGNAL,QUrl, pyqtSlot, pyqtSignal, QPoint, QPointF,QRectF,QString)

from PyQt4.QtGui import (QApplication, QDialog, QHBoxLayout, QIcon, QColor, QPainterPath,

QPainter, QPolygonF, QPen, QBrush, QGraphicsObject,

QListWidget, QListWidgetItem, QSplitter, QTableWidget, QPushButton, QCursor)

from PyQt4 import QtDeclarative

# globals used to aid visualization. Below is a table of input and output offset values depending on the type of the

# workstep. The Segment class uses this to determine where to draw the edges since the edge just knows which operation

# it is attached to. This table must be coordinated with the icon artwork.

outputOffsets = {QString(u'DataIntegrator') : [140,130], QString(u'endpoint') : [0,0], QString(u'FitContinuous') : [160,105], QString(u'TreeTransform') : [140,105], QString(u'TreeFromFile') : [155,125], QString(u'OpenTreeOfLife') : [155,125], QString(u'CharacterMatrix') : [155,125]}

inputOffsets = {QString(u'DataIntegrator') : [0,70], 'endpoint' : [0,0], QString(u'FitContinuous') : [5,95], QString(u'TreeTransform') : [5,115]}

# A table of operation types is needed to look back by name to find out the proper operation type and then lookup the index

# This dictionary is filled out as objects are added to the scene. The Segment class uses this cross-reference to find the

# types to lookup in the global offset table above.

operationsType = {}

# Switch convenience class definition of a switch statement for python. This lets us use

# c-like switch options in python methods

class switch(object):

return False

# This represents the connection segment used. There has to be a sourceObject

# and destination object instantiated in order to set positions correctly.

class Segment(QtDeclarative.QDeclarativeItem):

self.update(self.boundingRect())

#------------------------------------------------------------------------------------------------

# This class, the WorkspaceManager, handles the logic of adding and connecting workspace steps.

# A list of steps and connecting edges, along with the dynamic objects names, is maintained and

# this class manages the QML display of the workspace itself.

#------------------------------------------------------------------------------------------------

class workflowManager(QtCore.QObject):