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import pickle
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QBrush, QPalette
from PyQt5.QtWidgets import (QFileDialog, QApplication,
QGraphicsScene, QGraphicsView, QHBoxLayout, QMenu,
QTabWidget, QWidget, QSpacerItem, QStyle)
from . import graphics, dialogs
from .sizes import paperSizes, ppiList, sheetDimensionList
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
# self.setFixedSize(parent.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.setBackgroundBrush(QBrush(Qt.white)) #set white background
self.view = QGraphicsView(self.painter) #create a viewport for the canvas board
self.layout = QHBoxLayout(self) #create the layout of the canvas, the canvas could just subclass QGView instead
self.layout.addWidget(self.view, alignment=Qt.AlignCenter)
# self.spacer = QSpacerItem(1, self.height()) #Horizonatal spacer to force view to not expand to fill widget
# self.layout.addSpacerItem(self.spacer)
# self.layout.addSpacing(0)
self.layout.setContentsMargins(0, 0, 0 ,0)
self.layout.setSpacing(0)
#set layout and background color
self.setLayout(self.layout)
self.painter.setSceneRect(0, 0, *paperSizes[self.canvasSize][self.ppi])
# ensure that the scene is always aligned on the left, instead of being
# centered (the default)
# self.view.setAlignment(Qt.AlignLeft|Qt.AlignTop)
def resizeView(self, w, h):
#helper function to resize canvas
self.painter.setSceneRect(0, 0, w, h)
# self.view.setSceneRect(0, 0, w - self.view.frameWidth() * 2, h)
# self.adjustView()
def adjustView(self):
#update view size
width, height = self.dimensions
frameWidth = self.view.frameWidth()
self.view.setSceneRect(0, 0, width - frameWidth*2, height)
# give the view some time to adjust itself
prect = self.parent().parentWidget().parentWidget().parentWidget().rect()
width = width + 50
height = height + 100
if self.view.verticalScrollBar().isVisible():
width += self.style().pixelMetric(QStyle.PM_ScrollBarExtent)
if self.view.horizontalScrollBar().isVisible():
height += self.style().pixelMetric(QStyle.PM_ScrollBarExtent)
self.view.setFixedWidth(min(prect.width() - 50, width))
self.view.setFixedHeight(min(prect.height() - 100, height))
# self.resize(width + frameWidth * 2, height + frameWidth * 2)
def resizeEvent(self, event):
#overloaded function to also view size on window update
self.adjustView()
# pass
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.resizeView(*paperSizes[self.canvasSize][self.ppi])
@ppi.setter
def ppi(self, ppi):
self._ppi = ppi
if self.painter:
self.resizeView(*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()
#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)
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