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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from PySide6.QtCore import QDir, QFile, QIODevice, QUrl, Qt, Slot
from PySide6.QtGui import QFontDatabase
from PySide6.QtWebChannel import QWebChannel
from PySide6.QtWidgets import QDialog, QFileDialog, QMainWindow, QMessageBox
from ui_mainwindow import Ui_MainWindow
from document import Document
from previewpage import PreviewPage
class MainWindow(QMainWindow):
def __init__(self, parent=None):
super().__init__(parent)
self.m_file_path = ''
self.m_content = Document()
self._ui = Ui_MainWindow()
self._ui.setupUi(self)
font = QFontDatabase.systemFont(QFontDatabase.FixedFont)
self._ui.editor.setFont(font)
self._ui.preview.setContextMenuPolicy(Qt.NoContextMenu)
self._page = PreviewPage(self)
self._ui.preview.setPage(self._page)
self._ui.editor.textChanged.connect(self.plainTextEditChanged)
self._channel = QWebChannel(self)
self._channel.registerObject("content", self.m_content)
self._page.setWebChannel(self._channel)
self._ui.preview.setUrl(QUrl("qrc:/index.html"))
self._ui.actionNew.triggered.connect(self.onFileNew)
self._ui.actionOpen.triggered.connect(self.onFileOpen)
self._ui.actionSave.triggered.connect(self.onFileSave)
self._ui.actionSaveAs.triggered.connect(self.onFileSaveAs)
self._ui.actionExit.triggered.connect(self.close)
self._ui.editor.document().modificationChanged.connect(self._ui.actionSave.setEnabled)
defaultTextFile = QFile(":/default.md")
defaultTextFile.open(QIODevice.ReadOnly)
data = defaultTextFile.readAll()
self._ui.editor.setPlainText(data.data().decode('utf8'))
@Slot()
def plainTextEditChanged(self):
self.m_content.setText(self._ui.editor.toPlainText())
@Slot(str)
def openFile(self, path):
f = QFile(path)
name = QDir.toNativeSeparators(path)
if not f.open(QIODevice.ReadOnly):
error = f.errorString()
QMessageBox.warning(self, self.windowTitle(),
f"Could not open file {name}: {error}")
return
self.m_file_path = path
data = f.readAll()
self._ui.editor.setPlainText(data.data().decode('utf8'))
self.statusBar().showMessage(f"Opened {name}")
def isModified(self):
return self._ui.editor.document().isModified()
@Slot()
def onFileNew(self):
if self.isModified():
m = "You have unsaved changes. Do you want to create a new document anyway?"
button = QMessageBox.question(self, self.windowTitle(), m)
if button != QMessageBox.Yes:
return
self.m_file_path = ''
self._ui.editor.setPlainText("## New document")
self._ui.editor.document().setModified(False)
@Slot()
def onFileOpen(self):
if self.isModified():
m = "You have unsaved changes. Do you want to open a new document anyway?"
button = QMessageBox.question(self, self.windowTitle(), m)
if button != QMessageBox.Yes:
return
dialog = QFileDialog(self)
dialog.setWindowTitle("Open MarkDown File")
dialog.setMimeTypeFilters(["text/markdown"])
dialog.setAcceptMode(QFileDialog.AcceptOpen)
if dialog.exec() == QDialog.Accepted:
self.openFile(dialog.selectedFiles()[0])
@Slot()
def onFileSave(self):
if not self.m_file_path:
self.onFileSaveAs()
if not self.m_file_path:
return
f = QFile(self.m_file_path)
name = QDir.toNativeSeparators(self.m_file_path)
if not f.open(QIODevice.WriteOnly | QIODevice.Text):
error = f.errorString()
QMessageBox.warning(self, self.windowTitle(),
f"Could not write to file {name}: {error}")
return
text = self._ui.editor.toPlainText()
f.write(bytes(text, encoding='utf8'))
f.close()
self._ui.editor.document().setModified(False)
self.statusBar().showMessage(f"Wrote {name}")
@Slot()
def onFileSaveAs(self):
dialog = QFileDialog(self)
dialog.setWindowTitle("Save MarkDown File")
dialog.setMimeTypeFilters(["text/markdown"])
dialog.setAcceptMode(QFileDialog.AcceptSave)
dialog.setDefaultSuffix("md")
if dialog.exec() != QDialog.Accepted:
return
path = dialog.selectedFiles()[0]
self.m_file_path = path
self.onFileSave()
def closeEvent(self, event):
if self.isModified():
m = "You have unsaved changes. Do you want to exit anyway?"
button = QMessageBox.question(self, self.windowTitle(), m)
if button != QMessageBox.Yes:
event.ignore()
else:
event.accept()
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