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Diffstat (limited to 'examples/webenginewidgets/markdowneditor/mainwindow.py')
| -rw-r--r-- | examples/webenginewidgets/markdowneditor/mainwindow.py | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/examples/webenginewidgets/markdowneditor/mainwindow.py b/examples/webenginewidgets/markdowneditor/mainwindow.py new file mode 100644 index 000000000..4f19f4323 --- /dev/null +++ b/examples/webenginewidgets/markdowneditor/mainwindow.py @@ -0,0 +1,173 @@ +############################################################################# +## +## Copyright (C) 2021 The Qt Company Ltd. +## Contact: http://www.qt.io/licensing/ +## +## This file is part of the Qt for Python examples of the Qt Toolkit. +## +## $QT_BEGIN_LICENSE:BSD$ +## You may use this file under the terms of the BSD license as follows: +## +## "Redistribution and use in source and binary forms, with or without +## modification, are permitted provided that the following conditions are +## met: +## * Redistributions of source code must retain the above copyright +## notice, this list of conditions and the following disclaimer. +## * Redistributions in binary form must reproduce the above copyright +## notice, this list of conditions and the following disclaimer in +## the documentation and/or other materials provided with the +## distribution. +## * Neither the name of The Qt Company Ltd nor the names of its +## contributors may be used to endorse or promote products derived +## from this software without specific prior written permission. +## +## +## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +## +## $QT_END_LICENSE$ +## +############################################################################# + + +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(str) + 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(tr("## 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, windowTitle(), + f"Could not write to file {name}: {error}") + return + text = self._ui.editor.toPlainText() + f.write(bytes(text, encoding='utf8')) + f.close() + self.statusBar().showMessage(f"Wrote {name}") + + @Slot() + def onFileSaveAs(self): + dialog = QFileDialog(self) + dialog.setWindowTitle("Open 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() |