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
|
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)
#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)
|
