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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.QtWidgets import (QDialog, QFileDialog, QMainWindow, QMessageBox)
from PySide6.QtCore import (QDir, QFile, QFileInfo, QSettings, Slot)
from ui_mainwindow import Ui_MainWindow
from viewerfactory import ViewerFactory
from recentfiles import RecentFiles
from recentfilemenu import RecentFileMenu
settingsDir = "WorkingDir"
settingsMainWindow = "MainWindow"
settingsViewers = "Viewers"
settingsFiles = "RecentFiles"
ABOUT_TEXT = """A Widgets application to display and print JSON,
text and PDF files. Demonstrates various features to use
in widget applications: Using QSettings, query and save
user preferences, manage file histories and control cursor
behavior when hovering over widgets.
"""
class MainWindow(QMainWindow):
def __init__(self, parent=None):
super().__init__(parent)
self.ui = Ui_MainWindow()
self._currentDir = QDir()
self._viewer = None
self._recentFiles = RecentFiles()
self.ui.setupUi(self)
self.ui.actionOpen.triggered.connect(self.onActionOpenTriggered)
self.ui.actionAbout.triggered.connect(self.onActionAboutTriggered)
self.ui.actionAboutQt.triggered.connect(self.onActionAboutQtTriggered)
self._recentFiles = RecentFiles(self.ui.actionRecent)
self._recentFiles.countChanged.connect(self._recentFilesCountChanged)
self.readSettings()
self._factory = ViewerFactory(self.ui.viewArea, self)
viewers = ", ".join(self._factory.viewerNames())
self.statusBar().showMessage(f'Available viewers: {viewers}')
menu = RecentFileMenu(self, self._recentFiles)
self.ui.actionRecent.setMenu(menu)
menu.fileOpened.connect(self.openFile)
button = self.ui.mainToolBar.widgetForAction(self.ui.actionRecent)
if button:
self.ui.actionRecent.triggered.connect(button.showMenu)
@Slot(int)
def _recentFilesCountChanged(self, count):
self.ui.actionRecent.setText(f"{count} recent files")
def closeEvent(self, event):
self.saveSettings()
@Slot(int)
def onActionOpenTriggered(self):
fileDialog = QFileDialog(self, "Open Document",
self._currentDir.absolutePath())
while (fileDialog.exec() == QDialog.DialogCode.Accepted
and not self.openFile(fileDialog.selectedFiles()[0])):
pass
@Slot(str)
def openFile(self, fileName):
file = QFile(fileName)
if not file.exists():
nf = QDir.toNativeSeparators(fileName)
self.statusBar().showMessage(f"File {nf} could not be opened")
return False
fileInfo = QFileInfo(file)
self._currentDir = fileInfo.dir()
self._recentFiles.addFile(fileInfo.absoluteFilePath())
# If a viewer is already open, clean it up and save its settings
self.resetViewer()
self._viewer = self._factory.viewer(file)
if not self._viewer:
nf = QDir.toNativeSeparators(fileName)
self.statusBar().showMessage(f"File {nf} can't be opened.")
return False
self.ui.actionPrint.setEnabled(self._viewer.hasContent())
self._viewer.printingEnabledChanged.connect(self.ui.actionPrint.setEnabled)
self.ui.actionPrint.triggered.connect(self._viewer.print_)
self._viewer.showMessage.connect(self.statusBar().showMessage)
self._viewer.initViewer(self.ui.actionBack, self.ui.actionForward,
self.ui.menuHelp.menuAction(),
self.ui.tabWidget)
self.restoreViewerSettings()
self.ui.scrollArea.setWidget(self._viewer.widget())
return True
@Slot()
def onActionAboutTriggered(self):
viewerNames = ", ".join(self._factory.viewerNames())
mimeTypes = '\n'.join(self._factory.supportedMimeTypes())
text = ABOUT_TEXT
text += f"\nThis version has loaded the following plugins:\n{viewerNames}\n"
text += f"\n\nIt supports the following mime types:\n{mimeTypes}"
defaultViewer = self._factory.defaultViewer()
if defaultViewer:
n = defaultViewer.viewerName()
text += f"\n\nOther mime types will be displayed with {n}."
QMessageBox.about(self, "About Document Viewer Demo", text)
@Slot()
def onActionAboutQtTriggered(self):
QMessageBox.aboutQt(self)
def readSettings(self):
settings = QSettings()
# Restore working directory
if settings.contains(settingsDir):
self._currentDir = QDir(settings.value(settingsDir))
else:
self._currentDir = QDir.current()
# Restore QMainWindow state
if settings.contains(settingsMainWindow):
mainWindowState = settings.value(settingsMainWindow)
self.restoreState(mainWindowState)
# Restore recent files
self._recentFiles.restoreFromSettings(settings, settingsFiles)
def saveSettings(self):
settings = QSettings()
# Save working directory
settings.setValue(settingsDir, self._currentDir.absolutePath())
# Save QMainWindow state
settings.setValue(settingsMainWindow, self.saveState())
# Save recent files
self._recentFiles.saveSettings(settings, settingsFiles)
settings.sync()
def saveViewerSettings(self):
if not self._viewer:
return
settings = QSettings()
settings.beginGroup(settingsViewers)
settings.setValue(self._viewer.viewerName(), self._viewer.saveState())
settings.endGroup()
settings.sync()
def resetViewer(self):
if not self._viewer:
return
self.saveViewerSettings()
self._viewer.cleanup()
def restoreViewerSettings(self):
if not self._viewer:
return
settings = QSettings()
settings.beginGroup(settingsViewers)
viewerSettings = settings.value(self._viewer.viewerName())
settings.endGroup()
if viewerSettings:
self._viewer.restoreState(viewerSettings)
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