Add reload from disk

This is typically mapped to the F5 key, so the "secret force refresh"
key has been temporarily moved to F6.

document.cpp

@@ -94,6 +94,25 @@ bool TeletextDocument::isEmpty() const
 	return true;
 }
 
+void TeletextDocument::clear()
+{
+	LevelOnePage *blankSubPage = new LevelOnePage;
+
+	m_subPages.insert(m_subPages.begin(), blankSubPage);
+
+	emit aboutToChangeSubPage();
+	m_currentSubPageIndex = 0;
+	m_clutModel->setSubPage(m_subPages[0]);
+	emit subPageSelected();
+	cancelSelection();
+	m_undoStack->clear();
+
+	for (int i=m_subPages.size()-1; i>0; i--) {
+		delete(m_subPages[i]);
+		m_subPages.erase(m_subPages.begin()+i);
+	}
+}
+
 /*
 void TeletextDocument::setPageFunction(PageFunctionEnum newPageFunction)
 {

document.h

@@ -56,6 +56,7 @@ public:
 	~TeletextDocument();
 
 	bool isEmpty() const;
+	void clear();
 
 	PageFunctionEnum pageFunction() const { return m_pageFunction; }
 //	void setPageFunction(PageFunctionEnum);

mainwidget.cpp

@@ -386,7 +386,7 @@ void TeletextWidget::keyPressEvent(QKeyEvent *event)
 		case Qt::Key_PageDown:
 			m_teletextDocument->selectSubPagePrevious();
 			break;
-		case Qt::Key_F5:
+		case Qt::Key_F6:
 			m_pageDecode.decodePage();
 			m_pageRender.renderPage(true);
 			update();

mainwindow.cpp

@@ -149,6 +149,34 @@ bool MainWindow::saveAs()
 	return saveFile(fileName);
 }
 
+void MainWindow::reload()
+{
+	if (m_isUntitled)
+		return;
+
+	if (!m_textWidget->document()->undoStack()->isClean()) {
+		const QMessageBox::StandardButton ret = QMessageBox::warning(this, QApplication::applicationDisplayName(), tr("The document \"%1\" has been modified.\nDo you want to discard your changes?").arg(QFileInfo(m_curFile).fileName()), QMessageBox::Discard | QMessageBox::Cancel);
+
+		if (ret != QMessageBox::Discard)
+			return;
+	} else {
+		const QMessageBox::StandardButton ret = QMessageBox::warning(this, QApplication::applicationDisplayName(), tr("Do you want to reload the document \"%1\" from disk?").arg(QFileInfo(m_curFile).fileName()), QMessageBox::Yes | QMessageBox::No);
+
+		if (ret != QMessageBox::Yes)
+			return;
+	}
+
+	int subPageIndex = m_textWidget->document()->currentSubPageIndex();
+
+	m_textWidget->document()->clear();
+	loadFile(m_curFile);
+
+	if (subPageIndex >= m_textWidget->document()->numberOfSubPages())
+		subPageIndex = m_textWidget->document()->numberOfSubPages()-1;
+
+	m_textWidget->document()->selectSubPageIndex(subPageIndex, true);
+}
+
 void MainWindow::exportPNG()
 {
 	QString exportFileName = QFileDialog::getSaveFileName(this, tr("Export PNG"), QString(), "PNG image (*.png)");
@@ -328,6 +356,11 @@ void MainWindow::createActions()
 	saveAsAct->setShortcuts(QKeySequence::SaveAs);
 	saveAsAct->setStatusTip(tr("Save the document under a new name"));
 
+	const QIcon reloadIcon = QIcon::fromTheme("document-revert");
+	QAction *reloadAct = fileMenu->addAction(reloadIcon, tr("Reload"), this, &MainWindow::reload);
+	reloadAct->setShortcuts(QKeySequence::Refresh);
+	reloadAct->setStatusTip(tr("Reload the document from disk"));
+
 	fileMenu->addSeparator();
 
 	QMenu *recentMenu = fileMenu->addMenu(tr("Recent"));

mainwindow.h

@@ -59,6 +59,7 @@ private slots:
 	void open();
 	bool save();
 	bool saveAs();
+	void reload();
 	void exportT42();
 	void exportZXNet();
 	void exportEditTF();