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import pickle
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QBrush
from PyQt5.QtWidgets import (QComboBox, QDialog, QFileDialog, QFormLayout,
QGraphicsScene, QGraphicsView, QHBoxLayout,
QLabel, QMainWindow, QMdiSubWindow, QMenu,
QMessageBox, QTabWidget, QWidget)
from . import graphics, dialogs
from .sizes import paperSizes, ppiList, sheetDimensionList
from .tabs import customTabWidget
class canvas(QWidget):
"""
Defines the work area for a single sheet. Contains a QGraphicScene along with necessary properties
for context menu and dialogs.
"""
def __init__(self, parent=None, size= 'A4', ppi= '72'):
super(canvas, self).__init__(parent)
#Store values for the canvas dimensions for ease of access, these are here just to be
# manipulated by the setters and getters
self._ppi = ppi
self._canvasSize = size
#Create area for the graphic items to be placed, this is just here right now for the future
# when we will draw items on this, this might be changed if QGraphicScene is subclassed.
self.painter = QGraphicsScene()
self.painter.setSceneRect(0, 0, *paperSizes[self.canvasSize][self.ppi])
self.painter.setBackgroundBrush(QBrush(Qt.white)) #set white background
self.view = QGraphicsView(self.painter) #create a viewport for the canvas board
self.view.setMinimumSize(595, 842) #experimentation for the viewport overflow
self.view.setSceneRect(0, 0, *paperSizes[self.canvasSize][self.ppi]) # use the dimensions set previously
self.layout = QHBoxLayout(self) #create the layout of the canvas, the canvas could just subclass QGView instead
self.layout.addWidget(self.view)
self.setLayout(self.layout)
#This is done so that a right click menu is shown on right click
self.setContextMenuPolicy(Qt.CustomContextMenu)
self.customContextMenuRequested.connect(self.contextMenu)
def setCanvasSize(self, size):
"""
extended setter for dialog box
"""
self.canvasSize = size
def setCanvasPPI(self, ppi):
"""
extended setter for dialog box
"""
self.ppi = ppi
@property
def canvasSize(self):
return self._canvasSize
@property
def ppi(self):
return self._ppi
@canvasSize.setter
def canvasSize(self, size):
self._canvasSize = size
if self.painter:
self.painter.setSceneRect(0, 0, *paperSizes[self.canvasSize][self.ppi])
self.view.setSceneRect(0, 0, *paperSizes[self.canvasSize][self.ppi])
@ppi.setter
def ppi(self, ppi):
self._ppi = ppi
if self.painter:
self.painter.setSceneRect(0, 0, *paperSizes[self.canvasSize][self.ppi])
self.view.setSceneRect(0, 0, *paperSizes[self.canvasSize][self.ppi])
@property
def dimensions(self):
#returns the dimension of the current scene
return self.painter.sceneRect().width(), self.painter.sceneRect().height()
def contextMenu(self, point):
#function to display the right click menu at point of right click
menu = QMenu("Context Menu", self)
menu.addAction("Adjust Canvas", self.adjustCanvasDialog)
menu.exec_(self.mapToGlobal(point))
def adjustCanvasDialog(self):
#helper function to the context menu dialog box
self.canvasSize, self.ppi = dialogs.paperDims(self, self._canvasSize, self._ppi, self.objectName).exec_()
#following 2 methods are defined for correct pickling of the scene. may be changed to json or xml later so as
# to not have a binary file.
def __getstate__(self) -> dict:
return {
"_classname_": self.__class__.__name__,
"ppi": self._ppi,
"canvasSize": self._canvasSize,
"ObjectName": self.objectName(),
"items": [i.__getState__() for i in self.painter.items()]
}
def __setstate__(self, dict):
self.__init__()
self._ppi = dict['ppi']
self._canvasSize = dict['canvasSize']
self.setObjectName(dict['ObjectName'])
for item in dict['items']:
graphic = getattr(graphics, dict['_classname_'])
graphic.__setstate__(item)
self.painter.addItem(graphic)
class fileWindow(QMdiSubWindow):
"""
This defines a single file, inside the application, consisting of multiple tabs that contain
canvases. Pre-Defined so that a file can be instantly created without defining the structure again.
"""
def __init__(self, parent = None, title = 'New Project', size = 'A4', ppi = '72'):
super(fileWindow, self).__init__(parent)
#Uses a custom QTabWidget that houses a custom new Tab Button, used to house the seperate
# diagrams inside a file
self.tabber = customTabWidget(self)
self.tabber.setObjectName(title) #store title as object name for pickling
self.tabber.tabCloseRequested.connect(self.closeTab) # Show save alert on tab close
self.tabber.currentChanged.connect(self.changeTab) # placeholder just to detect tab change
self.tabber.plusClicked.connect(self.newDiagram) #connect the new tab button to add a new tab
#assign layout to widget
self.setWidget(self.tabber)
self.setWindowTitle(title)
def changeTab(self, currentIndex):
#placeholder function to detect tab change
pass
def closeTab(self, currentIndex):
#show save alert on tab close
if dialogs.saveEvent(self):
self.tabber.widget(currentIndex).deleteLater()
self.tabber.removeTab(currentIndex)
def newDiagram(self):
# helper function to add a new tab on pressing new tab button, using the add tab method on QTabWidget
diagram = canvas(self.tabber)
diagram.setObjectName("New")
self.tabber.addTab(diagram, "New")
def resizeHandler(self, parent = None):
# experimental resize Handler to handle resize on parent resize.
parentRect = parent.rect() if parent else self.parent().rect()
self.resize(parentRect.width(), parentRect.height())
self.setMaximumHeight(parentRect.height())
self.tabber.setMaximumHeight(parentRect.height())
for i in self.tabList:
i.setMaximumHeight(parentRect.height())
@property
def tabList(self):
#returns a list of tabs in the given window
return [self.tabber.widget(i) for i in range(self.tabCount)]
@property
def tabCount(self):
#returns the number of tabs in the given window only
return self.tabber.count()
def saveProject(self, name = None):
# called by dialog.saveEvent, saves the current file
name = QFileDialog.getSaveFileName(self, 'Save File', f'New Diagram', 'Process Flow Diagram (*.pfd)') if not name else name
if name:
with open(name[0],'wb') as file:
pickle.dump(self, file)
return True
else:
return False
def closeEvent(self, event):
# handle save alert on file close, check if current file has no tabs aswell.
if self.tabCount==0 or dialogs.saveEvent(self):
event.accept()
self.deleteLater()
else:
event.ignore()
#following 2 methods are defined for correct pickling of the scene. may be changed to json or xml later so as
# to not have a binary file.
def __getstate__(self) -> dict:
return {
"_classname_": self.__class__.__name__,
"ObjectName": self.objectName(),
"ppi": self._ppi,
"canvasSize": self._canvasSize,
"tabs": [i.__getstate__() for i in self.tabList]
}
def __setstate__(self, dict):
self.__init__(title = dict['ObjectName'])
for i in dict['tabs']:
diagram = canvas(self.tabber, size = dict['canvasSize'], ppi = dict['ppi'])
diagram.__setstate__(i)
self.tabber.addTab(diagram, i['ObjectName'])
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