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from PyQt5.QtCore import Qt, pyqtSignal, QPoint
from PyQt5.QtGui import QIcon
from PyQt5.QtWidgets import (QFileDialog, QHBoxLayout,
QMdiSubWindow, QMenu, QPushButton, QSizePolicy,
QSplitter, QWidget, QStyle, QSizePolicy)
from os import path
from . import dialogs
from .graphics import CustomView
from .canvas import canvas
from .tabs import CustomTabWidget
from .undo import resizeCommand
from .app import dump, loads, JSON_Typer, version
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.
"""
fileCloseEvent = pyqtSignal(int)
tabChangeEvent = pyqtSignal()
def __init__(self, parent = None, title = 'New Project', size = 'A0', ppi = '72'):
super(FileWindow, self).__init__(parent)
self._sideViewTab = None
self.index = None
self.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)
#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.mainWidget = QWidget(self)
layout = QHBoxLayout(self.mainWidget)
self.createSideViewArea() #create the side view objects
# set size policies for window
left = QSizePolicy(QSizePolicy.Preferred, QSizePolicy.Preferred)
left.setHorizontalStretch(1)
self.tabber.setSizePolicy(left)
right = QSizePolicy(QSizePolicy.Preferred, QSizePolicy.Preferred)
right.setHorizontalStretch(1)
self.sideView.setSizePolicy(right)
#build widget layout
layout.addWidget(self.tabber)
layout.addWidget(self.sideView)
self.mainWidget.setLayout(layout)
self.setWidget(self.mainWidget)
self.setWindowTitle(title)
#This is done so that a right click menu is shown on right click
self.tabber.setContextMenuPolicy(Qt.CustomContextMenu)
self.tabber.customContextMenuRequested.connect(self.contextMenu)
# self.setAttribute(Qt.WA_DeleteOnClose, True)
self.setWindowFlag(Qt.CustomizeWindowHint, True)
self.setWindowFlag(Qt.WindowMinimizeButtonHint, False)
self.setWindowFlag(Qt.WindowMaximizeButtonHint, False)
self.setWindowFlag(Qt.WindowCloseButtonHint, True)
def createSideViewArea(self):
#creates the side view widgets and sets them to invisible
self.sideView = CustomView(parent = self)
self.sideView.setInteractive(False)
self.sideViewCloseButton = QPushButton('×', self.sideView)
self.sideViewCloseButton.setObjectName("sideViewCloseButton")
self.sideViewCloseButton.setFlat(True)
self.sideViewCloseButton.setFixedSize(20, 20)
self.moveSideViewCloseButton()
self.sideViewCloseButton.clicked.connect(lambda: setattr(self, 'sideViewTab', None))
self.sideView.setVisible(False)
self.sideView.setContextMenuPolicy(Qt.CustomContextMenu)
self.sideView.customContextMenuRequested.connect(self.sideViewContextMenu)
self.sideView.resize(self.width()//2 - self.sideView.frameWidth(), self.height())
def resizeHandler(self):
# resize Handler to handle resize cases.
parentRect = self.mdiArea().size()
current = self.tabber.currentWidget()
width, height = current.dimensions
if self.sideViewTab:
width2, height2 = self.sideViewTab.dimensions
width = min(parentRect.width(), width + width2)
height = min(parentRect.height(), height + height2)
else:
width = min(parentRect.width(), width + 100)
height = min(parentRect.height(), height + 150)
if len(self.parent().parent().subWindowList()) > 1:
height -= 20
# set element dimensions
self.setFixedSize(width, height)
current.adjustView()
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.addAction("Remove Side View" if self.sideViewTab == self.tabber.currentWidget() else "View Side-By-Side",
self.sideViewMode)
menu.addAction("Reset Zoom", lambda : setattr(self.tabber.currentWidget().view, 'zoom', 1))
if self.tabber.currentWidget().streamTable is None:
menu.addAction("Add Stream Table", lambda x=self, pos=point: x.tabber.currentWidget().addStreamTable(pos))
menu.exec_(self.tabber.mapToGlobal(point))
def sideViewMode(self):
#helper context menu function to toggle side view
self.sideViewTab = self.tabber.currentWidget()
def adjustCanvasDialog(self):
#helper context menu function to the context menu dialog box
currentTab = self.tabber.currentWidget()
result = dialogs.paperDims(self, currentTab._canvasSize, currentTab._ppi, currentTab.objectName(), currentTab.landscape).exec_()
if result is not None:
currentTab.painter.undoStack.push(resizeCommand(result, currentTab, self))
def sideViewToggle(self):
#Function checks if current side view tab is set, and toggles view as required
if self.sideViewTab:
self.sideView.setVisible(True)
self.sideView.setScene(self.tabber.currentWidget().painter)
self.resizeHandler()
return True
else:
self.sideView.setVisible(False)
self.resizeHandler()
return False
def moveSideViewCloseButton(self):
# used to place side view close button at appropriate position
self.sideViewCloseButton.move(5, 5)
def sideViewContextMenu(self, point):
# context menu for side view
menu = QMenu("Context Menu", self.sideView)
menu.addAction("Reset Zoom", lambda : setattr(self.sideView, 'zoom', 1))
menu.addSection('Change Side View Tab')
if self.tabCount > 5:
# just show switch dialog box, if there are 6 or more tabs open
menu.addAction("Show switch menu", self.sideViewSwitchTab)
else:
# enumerate all tabs from side view.
for i in range(self.tabCount):
j = self.tabber.widget(i)
if j == self.sideViewTab:
continue
# evaluate i as index, weird lambda behaviour
#see https://stackoverflow.com/a/33984811/7799568
menu.addAction(f'{i}. {j.objectName()}', lambda index=i: self.sideViewSwitchCMenu(index))
menu.addAction("Remove side view", lambda : setattr(self, 'sideViewTab', None))
menu.exec_(self.sideView.mapToGlobal(point))
def sideViewSwitchCMenu(self, index):
# helper function to swtich side view tab
self.sideViewTab = self.tabber.widget(index)
def sideViewSwitchTab(self):
# displays a side view switch dialog box
tabList = [f'{i}. {j.objectName()}' for i, j in enumerate(self.tabList)] #names and index of all tabs
initial = self.tabList.index(self.sideViewTab) # current side view tab
result = dialogs.sideViewSwitchDialog(self.tabber, tabList, initial).exec_() #call dialog box
if result != initial:
self.sideViewTab = self.tabber.widget(result) if result<self.tabCount else None
@property
def sideViewTab(self):
#returns current active if sideViewTab otherwise None
return self._sideViewTab
@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()
@sideViewTab.setter
def sideViewTab(self, tab):
#setter for side view. Also toggles view as necessary
self._sideViewTab = None if tab == self.sideViewTab else tab
return self.sideViewToggle()
def changeTab(self, currentIndex):
#placeholder function to detect tab change
self.resizeHandler()
self.tabChangeEvent.emit()
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, objectName = "New"):
# helper function to add a new tab on pressing new tab button, using the add tab method on QTabWidget
diagram = canvas(self.tabber, parentMdiArea = self.mdiArea(), parentFileWindow = self)
diagram.setObjectName(objectName)
index = self.tabber.addTab(diagram, objectName)
self.tabber.setCurrentIndex(index)
return diagram
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[0]:
self.setObjectName(path.basename(name[0]).split(".")[0])
self.setWindowTitle(self.objectName())
with open(name[0],'w') as file:
dump(self, file, indent=4, cls=JSON_Typer)
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()
self.fileCloseEvent.emit(self.index)
else:
event.ignore()
#following 2 methods are defined for correct serialization of the scene.
def __getstate__(self) -> dict:
return {
"_classname_": self.__class__.__name__,
"version": version,
"ObjectName": self.objectName(),
"tabs": [i.__getstate__() for i in self.tabList]
}
def __setstate__(self, dict):
self.setObjectName(dict['ObjectName'])
self.setWindowTitle(dict['ObjectName'])
for i in dict['tabs']:
diagram = self.newDiagram(i['ObjectName'])
diagram.__setstate__(i)
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