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# Copyright (C) 2023 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from __future__ import annotations
from PySide6.QtCore import QObject
from PySide6.QtWidgets import (QDialog, QMenu)
from PySide6.QtCore import Signal, Slot
from PySide6.QtPrintSupport import QPrinter, QPrintDialog
MENU_NAME = "qtFileMenu"
class AbstractViewer(QObject):
uiInitialized = Signal()
printingEnabledChanged = Signal(bool)
showMessage = Signal(str, int)
documentLoaded = Signal(str)
def __init__(self):
super().__init__()
self._file = None
self._widget = None
self._menus = []
self._toolBars = []
self._printingEnabled = False
self._actions = []
self._fileMenu = None
def __del__(self):
self.cleanup()
def viewerName(self):
return ""
def saveState(self):
return False
def restoreState(self, state):
return False
def supportedMimeTypes():
return []
def init(self, file, widget, mainWindow):
self._file = file
self._widget = widget
self._uiAssets_mainWindow = mainWindow
def isEmpty(self):
return not self.hasContent()
def isPrintingEnabled(self):
return self._printingEnabled
def hasContent(self):
return False
def supportsOverview(self):
return False
def isModified(self):
return False
def saveDocument(self):
return False
def saveDocumentAs(self):
return False
def actions(self):
return self._actions
def widget(self):
return self._widget
def menus(self):
return self._menus
def mainWindow(self):
return self._uiAssets_mainWindow
def statusBar(self):
return self.mainWindow().statusBar()
def menuBar(self):
return self.mainWindow().menuBar()
def maybeEnablePrinting(self):
self.maybeSetPrintingEnabled(True)
def disablePrinting(self):
self.maybeSetPrintingEnabled(False)
def isDefaultViewer(self):
return False
def viewer(self):
return self
def statusMessage(self, message, type="", timeout=8000):
msg = self.viewerName()
if type:
msg += "/" + type
msg += ": " + message
self.showMessage.emit(msg, timeout)
def addToolBar(self, title):
bar = self.mainWindow().addToolBar(title)
name = title.replace(' ', '')
bar.setObjectName(name)
self._toolBars.append(bar)
return bar
def addMenu(self, title):
menu = QMenu(title, self.menuBar())
menu.setObjectName(title)
self.menuBar().insertMenu(self._uiAssets_help, menu)
self._menus.append(menu)
return menu
def cleanup(self):
# delete all objects created by the viewer which need to be displayed
# and therefore parented on MainWindow
if self._file:
self._file = None
self._menus.clear()
self._toolBars.clear()
def fileMenu(self):
if self._fileMenu:
return self._fileMenu
menus = self.mainWindow().findChildren(QMenu)
for menu in menus:
if menu.objectName() == MENU_NAME:
self._fileMenu = menu
return self._fileMenu
self._fileMenu = self.addMenu("File")
self._fileMenu.setObjectName(MENU_NAME)
return self._fileMenu
@Slot()
def print_(self):
type = "Printing"
if not self.hasContent():
self.statusMessage("No content to print.", type)
return
printer = QPrinter(QPrinter.PrinterMode.HighResolution)
dlg = QPrintDialog(printer, self.mainWindow())
dlg.setWindowTitle("Print Document")
if dlg.exec() == QDialog.DialogCode.Accepted:
self.printDocument(printer)
else:
self.statusMessage("Printing canceled!", type)
return
state = printer.printerState()
message = self.viewerName() + " :"
if state == QPrinter.PrinterState.Aborted:
message += "Printing aborted."
elif state == QPrinter.PrinterState.Active:
message += "Printing active."
elif state == QPrinter.PrinterState.Idle:
message += "Printing completed."
elif state == QPrinter.PrinterState.Error:
message += "Printing error."
self.statusMessage(message, type)
def maybeSetPrintingEnabled(self, enabled):
if enabled == self._printingEnabled:
return
self._printingEnabled = enabled
self.printingEnabledChanged.emit(enabled)
def initViewer(self, back, forward, help, tabs):
self._uiAssets_back = back
self._uiAssets_forward = forward
self._uiAssets_help = help
self._uiAssets_tabs = tabs
# Tabs can be populated individually by the viewer, if it
# supports overview
tabs.clear()
tabs.setVisible(self.supportsOverview())
self.uiInitialized.emit()
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