From 377470da47e421dafb5d3bfb9ad356730a081ca7 Mon Sep 17 00:00:00 2001
From: "G.K.MacGregor" <gkthemac@gmail.com>
Date: Sun, 20 Dec 2020 19:38:23 +0000
Subject: [PATCH] Auto-select level when loading

---
 document.cpp     | 13 +++++++++++
 document.h       |  1 +
 levelonepage.cpp | 61 ++++++++++++++++++++++++++++++++++++++++++++++++
 levelonepage.h   |  1 +
 mainwindow.cpp   | 31 +++++++++++++-----------
 mainwindow.h     |  1 +
 6 files changed, 95 insertions(+), 13 deletions(-)

diff --git a/document.cpp b/document.cpp
index b50faaa..68861bc 100644
--- a/document.cpp
+++ b/document.cpp
@@ -225,3 +225,16 @@ void TeletextDocument::cancelSelection()
 {
 	m_selectionSubPage = nullptr;
 }
+
+int TeletextDocument::levelRequired() const
+{
+	int levelSeen = 0;
+
+	for (auto &subPage : m_subPages) {
+		levelSeen = qMax(levelSeen, subPage->levelRequired());
+		if (levelSeen == 3)
+			break;
+	}
+
+	return levelSeen;
+}
diff --git a/document.h b/document.h
index 0b58a90..5adb9c5 100644
--- a/document.h
+++ b/document.h
@@ -78,6 +78,7 @@ public:
 	bool selectionActive() const { return m_selectionSubPage == currentSubPage(); }
 	void setSelection(int, int, int, int);
 	void cancelSelection();
+	int levelRequired() const;
 
 signals:
 	void cursorMoved();
diff --git a/levelonepage.cpp b/levelonepage.cpp
index 5d35155..9ac33c8 100644
--- a/levelonepage.cpp
+++ b/levelonepage.cpp
@@ -446,6 +446,67 @@ bool LevelOnePage::isPaletteDefault(int fromColour, int toColour) const
 	return true;
 }
 
+int LevelOnePage::levelRequired() const
+{
+	if (!isPaletteDefault(0, 15))
+		return 3;
+
+	// TODO Check for X/28/1 for DCLUT for mode 1-3 DRCS characters - return 3
+
+	int levelSeen = (!isPaletteDefault(16,31) || m_leftSidePanelDisplayed || m_rightSidePanelDisplayed || m_defaultScreenColour !=0 || m_defaultRowColour !=0 || m_blackBackgroundSubst || m_colourTableRemap !=0 || m_defaultCharSet != 0 || m_secondCharSet != 0xf) ? 2 : 0;
+
+	if (localEnhance.isEmpty())
+		return levelSeen;
+
+	for (int i=0; i<localEnhance.size(); i++) {
+		if (localEnhance.at(i).modeExt() == 0x2e) // Font style
+			return 3;
+
+		if (levelSeen == 0)
+			// Check for Level 1.5 triplets
+			switch (localEnhance.at(i).modeExt()) {
+				case 0x04: // Set Active Position
+				case 0x07: // Address Row 0
+				case 0x1f: // Termination
+				case 0x22: // G3 character @ Level 1.5
+				case 0x2f: // G2 character
+				case 0x30 ... 0x3f: // G0 character with diacritical
+					levelSeen = qMax(levelSeen, 1);
+					break;
+			}
+		if (levelSeen < 2)
+			switch (localEnhance.at(i).modeExt()) {
+				// Check for Level 2.5 triplets
+				case 0x00: // Full screen colour
+				case 0x01: // Full row colour
+				case 0x10 ... 0x13: // Origin Modifer and Object Invocation
+				case 0x15 ... 0x17: // Object Definition
+					// Check if Object Defition is required only at Level 3.5
+					if ((localEnhance.at(i).address() & 0x18) == 0x10)
+						return 3;
+					else
+						levelSeen = qMax(levelSeen, 2);
+					break;
+				case 0x18: // DRCS Mode
+					// Check if DRCS is required only at Level 3.5
+					if ((localEnhance.at(i).data() & 0x30) == 0x20)
+						return 3;
+					else
+						levelSeen = qMax(levelSeen, 2);
+					break;
+				case 0x20: // Foreground colour
+				case 0x21: // G1 character
+				case 0x23: // Background colour
+				case 0x27 ... 0x29: // Flash functions, G0 and G2 charset designation, G0 character @ Level 2.5
+				case 0x2b ... 0x2d: // G3 character @ Level 2.5, display attributes, DRCS character
+					levelSeen = qMax(levelSeen, 2);
+					break;
+			}
+	}
+
+	return levelSeen;
+}
+
 void LevelOnePage::setLeftSidePanelDisplayed(bool newLeftSidePanelDisplayed) { m_leftSidePanelDisplayed = newLeftSidePanelDisplayed; }
 void LevelOnePage::setRightSidePanelDisplayed(bool newRightSidePanelDisplayed) { m_rightSidePanelDisplayed = newRightSidePanelDisplayed; }
 void LevelOnePage::setSidePanelColumns(int newSidePanelColumns) { m_sidePanelColumns = newSidePanelColumns; }
diff --git a/levelonepage.h b/levelonepage.h
index f719aae..ce39060 100644
--- a/levelonepage.h
+++ b/levelonepage.h
@@ -83,6 +83,7 @@ public:
 	void setCLUT(int, int);
 	bool isPaletteDefault(int) const;
 	bool isPaletteDefault(int, int) const;
+	int levelRequired() const;
 	bool leftSidePanelDisplayed() const { return m_leftSidePanelDisplayed; }
 	void setLeftSidePanelDisplayed(bool);
 	bool rightSidePanelDisplayed() const { return m_rightSidePanelDisplayed; }
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 3a60f80..7b9783e 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -629,19 +629,19 @@ void MainWindow::createStatusBar()
 
 	statusBar()->addPermanentWidget(new QLabel("Level"));
 
-	QRadioButton *level1 = new QRadioButton("1");
-	QRadioButton *level15 = new QRadioButton("1.5");
-	QRadioButton *level25 = new QRadioButton("2.5");
-	QRadioButton *level35 = new QRadioButton("3.5");
-	statusBar()->addPermanentWidget(level1);
-	statusBar()->addPermanentWidget(level15);
-	statusBar()->addPermanentWidget(level25);
-	statusBar()->addPermanentWidget(level35);
-	level1->toggle();
-	connect(level1, &QAbstractButton::clicked, [=]() { m_textWidget->pageRender()->setRenderLevel(0); m_textWidget->update(); });
-	connect(level15, &QAbstractButton::clicked, [=]() { m_textWidget->pageRender()->setRenderLevel(1); m_textWidget->update(); });
-	connect(level25, &QAbstractButton::clicked, [=]() { m_textWidget->pageRender()->setRenderLevel(2); m_textWidget->update(); });
-	connect(level35, &QAbstractButton::clicked, [=]() { m_textWidget->pageRender()->setRenderLevel(3); m_textWidget->update(); });
+	m_levelRadioButton[0] = new QRadioButton("1");
+	m_levelRadioButton[1] = new QRadioButton("1.5");
+	m_levelRadioButton[2] = new QRadioButton("2.5");
+	m_levelRadioButton[3] = new QRadioButton("3.5");
+	statusBar()->addPermanentWidget(m_levelRadioButton[0]);
+	statusBar()->addPermanentWidget(m_levelRadioButton[1]);
+	statusBar()->addPermanentWidget(m_levelRadioButton[2]);
+	statusBar()->addPermanentWidget(m_levelRadioButton[3]);
+	m_levelRadioButton[0]->toggle();
+	connect(m_levelRadioButton[0], &QAbstractButton::clicked, [=]() { m_textWidget->pageRender()->setRenderLevel(0); m_textWidget->update(); });
+	connect(m_levelRadioButton[1], &QAbstractButton::clicked, [=]() { m_textWidget->pageRender()->setRenderLevel(1); m_textWidget->update(); });
+	connect(m_levelRadioButton[2], &QAbstractButton::clicked, [=]() { m_textWidget->pageRender()->setRenderLevel(2); m_textWidget->update(); });
+	connect(m_levelRadioButton[3], &QAbstractButton::clicked, [=]() { m_textWidget->pageRender()->setRenderLevel(3); m_textWidget->update(); });
 	statusBar()->showMessage(tr("Ready"));
 }
 
@@ -717,6 +717,8 @@ bool MainWindow::maybeSave()
 
 void MainWindow::loadFile(const QString &fileName)
 {
+	int levelSeen;
+
 	QFile file(fileName);
 	if (!file.open(QFile::ReadOnly | QFile::Text)) {
 		QMessageBox::warning(this, tr("QTeletextMaker"), tr("Cannot read file %1:\n%2.").arg(QDir::toNativeSeparators(fileName), file.errorString()));
@@ -726,6 +728,9 @@ void MainWindow::loadFile(const QString &fileName)
 
 	QApplication::setOverrideCursor(Qt::WaitCursor);
 	loadTTI(&file, m_textWidget->document());
+	levelSeen = m_textWidget->document()->levelRequired();
+	m_levelRadioButton[levelSeen]->toggle();
+	m_textWidget->pageRender()->setRenderLevel(levelSeen);
 	updatePageWidgets();
 
 	QApplication::restoreOverrideCursor();
diff --git a/mainwindow.h b/mainwindow.h
index d4e2458..b807c67 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -115,6 +115,7 @@ private:
 
 	QLabel *m_subPageLabel, *m_cursorPositionLabel;
 	QToolButton *m_previousSubPageButton, *m_nextSubPageButton;
+	QRadioButton *m_levelRadioButton[4];
 
 	QString m_curFile;
 	bool m_isUntitled;