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from PyQt5.QtCore import Qt, QPointF
from PyQt5.QtGui import QBrush, QPalette
from PyQt5.QtWidgets import (QFileDialog, QApplication, QHBoxLayout, QMenu,
QTabWidget, QWidget, QSpacerItem, QStyle)
from . import dialogs
from .graphics import customView, customScene
from .data import paperSizes, ppiList, sheetDimensionList
from .app import dumps, loads, JSON_Typer, shapeGrips, lines
import shapes
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' , parentMdiArea = None, parentFileWindow = None):
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.
#set layout and background color
self.painter = customScene()
self.painter.setBackgroundBrush(QBrush(Qt.white)) #set white background
self.view = customView(self.painter, self) #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.layout.setContentsMargins(0, 0, 0, 0)
self.setLayout(self.layout)
#set initial paper size for the scene
self.painter.setSceneRect(0, 0, *paperSizes[self._canvasSize][self._ppi])
self.parentMdiArea = parentMdiArea
self.parentFileWindow = parentFileWindow
def resizeView(self, w, h):
#helper function to resize canvas
self.painter.setSceneRect(0, 0, w, h)
def adjustView(self):
#utitily to adjust current diagram view
width, height = self.dimensions
frameWidth = self.view.frameWidth()
#update view size
self.view.setSceneRect(0, 0, width - frameWidth*2, height)
# use the available mdi area, also add padding
prect = self.parentMdiArea.rect()
width = width + 20
height = height + 60
# add scrollbar size to width and height if they are visible, avoids clipping
if self.view.verticalScrollBar().isVisible():
width += self.style().pixelMetric(QStyle.PM_ScrollBarExtent)
if self.view.horizontalScrollBar().isVisible():
height += self.style().pixelMetric(QStyle.PM_ScrollBarExtent)
#if view is visible use half of available width
factor = 2 if self.parentFileWindow.sideViewTab is not None else 1
#use minimum width required to fit the view
width = min((prect.width() - 40)//factor, width)
height = min(prect.height() - 80, height)
#set view dims
self.view.setFixedWidth(width)
self.view.setFixedHeight(height)
def resizeEvent(self, event):
#overloaded function to also view size on window update
self.adjustView()
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 dimensions(self):
#returns the dimension of the current scene
return self.painter.sceneRect().width(), self.painter.sceneRect().height()
@property
def items(self):
# generator to filter out certain items
for i in self.painter.items():
yield i
@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])
#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(),
"symbols": [i for i in self.painter.items() if isinstance(i, shapes.NodeItem)],
"lines": sorted([i for i in self.painter.items() if isinstance(i, shapes.Line)], key = lambda x: 1 if x.refLine else 0),
# "lineLabels": [i.__getstate__() for i in self.painter.items() if isinstance(i, shapes.LineLabel)],
# "itemLabels": [i.__getstate__() for i in self.painter.items() if isinstance(i, shapes.itemLabel)]
}
def __setstate__(self, dict):
self._ppi = dict['ppi']
self._canvasSize = dict['canvasSize']
self.setObjectName(dict['ObjectName'])
for item in dict['symbols']:
graphic = getattr(shapes, item['_classname_'])()
graphic.__setstate__(dict = item)
self.painter.addItem(graphic)
graphic.setPos(*item['pos'])
for gripitem in item['lineGripItems']:
shapeGrips[gripitem[0]] = (graphic, gripitem[1])
for item in dict['lines']:
line = shapes.Line(QPointF(*item['startPoint']), QPointF(*item['endPoint']))
lines[item['id']] = line
line.__setstate__(dict = item)
graphic, index = shapeGrips[item['startGripItem']]
line.setStartGripItem = graphic.lineGripItems[index]
graphic.lineGripItems[index].line = line
if item['endGripItem']:
graphic, index = shapeGrips[item['endGripItem']]
line.setEndGripItem = graphic.lineGripItems[index]
graphic.lineGripItems[index].line = line
else:
line.refLine = lines[item['refLine']]
line.refIndex = item['refIndex']
self.painter.addItem(line)
# line.addGrabber()
shapeGrips.clear()
lines.clear()
self.painter.advance()
# for item in dict['lineLabels']:
# pass
# for item in dict['itemLabels']:
# pass
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