1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
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.
#set layout and background color
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.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])
#set pointers to necessary parents for ease of reference
self.parentMdiArea = self.parent().parentWidget().parentWidget().parentWidget().parentWidget()
self.parentFileWindow = self.parent().parentWidget().parentWidget()
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() - 20)//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 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(),
"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)
|
