Add X/27/4 and X/27/5 compositional link editing

README.md

@@ -6,6 +6,7 @@ Features
 - Rendering of teletext pages in Levels 1, 1.5, 2.5 and 3.5
 - Rendering of Local Objects and side panels.
 - Interactive X/26 Local Enhancement Data triplet editor.
+- Editing of X/27/4 and X/27/5 compositional links to enhancement data pages.
 - Palette editor.
 - Configurable zoom.
 - View teletext pages in 4:3, 16:9 pillar-box and 16:9 stretch aspect ratios.

document.cpp

@@ -207,10 +207,26 @@ void TeletextDocument::setPageNumber(QString newPageNumberString)
 	// The LineEdit should check if a valid hex number was entered, but just in case...
 	bool newPageNumberOk;
 	int newPageNumberRead = newPageNumberString.toInt(&newPageNumberOk, 16);
-	if (newPageNumberOk && newPageNumberRead >= 0x100 && newPageNumberRead <= 0x8fe) {
+	if ((!newPageNumberOk) || newPageNumberRead < 0x100 || newPageNumberRead > 0x8fe)
-		m_pageNumber = newPageNumberRead;
+		return;
-		for (auto &subPage : m_subPages)
+
-			subPage->setPageNumber(newPageNumberRead);
+	// If the magazine number was changed, we'll need to update the relative magazine numbers in X/27
+	int oldMagazine = (m_pageNumber & 0xf00);
+	int newMagazine = (newPageNumberRead & 0xf00);
+	// Fix magazine 0 to 8
+	if (oldMagazine == 0x800)
+		oldMagazine = 0x000;
+	if (newMagazine == 0x800)
+		newMagazine = 0x000;
+	int magazineFlip = oldMagazine ^ newMagazine;
+
+	m_pageNumber = newPageNumberRead;
+
+	for (auto &subPage : m_subPages) {
+		subPage->setPageNumber(newPageNumberRead);
+		if (magazineFlip)
+			for (int i=0; i<8; i++)
+				subPage->setComposeLinkPageNumber(i, subPage->composeLinkPageNumber(i) ^ magazineFlip);
 	}
 }
 
@@ -224,8 +240,10 @@ void TeletextDocument::setFastTextLink(int linkNumber, QString newPageNumberStri
 	// The LineEdit should check if a valid hex number was entered, but just in case...
 	bool newPageNumberOk;
 	int newPageNumberRead = newPageNumberString.toInt(&newPageNumberOk, 16);
-	if (newPageNumberOk && newPageNumberRead >= 0x100 && newPageNumberRead <= 0x8ff)
+	if ((!newPageNumberOk) || newPageNumberRead < 0x100 || newPageNumberRead > 0x8ff)
-		m_fastTextLink[linkNumber] = newPageNumberRead;
+		return;
+
+	m_fastTextLink[linkNumber] = newPageNumberRead;
 }
 
 void TeletextDocument::cursorUp()

levelonepage.cpp

@@ -55,6 +55,11 @@ void LevelOnePage::clearPage()
 	for (int r=0; r<25; r++)
 		for (int c=0; c<40; c++)
 			m_level1Page[r][c] = 0x20;
+	for (int i=0; i<8; i++) {
+		setControlBit(i, false);
+		m_composeLink[i] = { (i<4) ? i : 0, false, i>=4, 0x0ff, 0x0000 };
+	}
+
 /*	m_subPageNumber = 0x0000; */
 	m_cycleValue = 8;
 	m_cycleType = CTseconds;
@@ -119,7 +124,23 @@ QByteArray LevelOnePage::packet(int packetNumber, int designationCode)
 		return result;
 	}
 
-	// TODO packet 27
+	// TODO packet 27/0
+
+	if (packetNumber == 27 && (designationCode == 4 || designationCode == 5)) {
+		for (int i=0; i<(designationCode == 4 ? 6 : 2); i++) {
+			int pageLinkNumber = i+(designationCode == 4 ? 0 : 6);
+
+			result[i*6+1] = (m_composeLink[pageLinkNumber].level3p5 << 3) | (m_composeLink[pageLinkNumber].level2p5 << 2) | m_composeLink[pageLinkNumber].function;
+			result[i*6+2] = ((m_composeLink[pageLinkNumber].pageNumber & 0x100) >> 3) | 0x10 | (m_composeLink[pageLinkNumber].pageNumber & 0x00f);
+			result[i*6+3] = ((m_composeLink[pageLinkNumber].pageNumber & 0x0f0) >> 2) | ((m_composeLink[pageLinkNumber].pageNumber & 0x600) >> 9);
+
+			result[i*6+4] = ((m_composeLink[pageLinkNumber].subPageCodes & 0x000f) << 2);
+			result[i*6+5] = ((m_composeLink[pageLinkNumber].subPageCodes & 0x03f0) >> 4);
+			result[i*6+6] = ((m_composeLink[pageLinkNumber].subPageCodes & 0xfc00) >> 10);
+		}
+
+		return result;
+	}
 
 	if (packetNumber == 28 && (designationCode == 0 || designationCode == 4)) {
 		int CLUToffset = (designationCode == 0) ? 16 : 0;
@@ -184,7 +205,26 @@ bool LevelOnePage::setPacket(int packetNumber, int designationCode, QByteArray p
 		return true;
 	}
 
-	// TODO packet 27
+	// TODO packet 27/0
+
+	if (packetNumber == 27 && (designationCode == 4 || designationCode == 5)) {
+		for (int i=0; i<(designationCode == 4 ? 6 : 2); i++) {
+			int pageLinkNumber = i+(designationCode == 4 ? 0 : 6);
+			int pageFunction = packetContents.at(i*6+1) & 0x03;
+			if (i >= 4)
+				m_composeLink[pageLinkNumber].function = pageFunction;
+			else if (i != pageFunction)
+				qDebug("X/27/4 link number %d fixed at function %d. Attempted to set to %d.", pageLinkNumber, pageLinkNumber, pageFunction);
+
+			m_composeLink[pageLinkNumber].level2p5 = packetContents.at(i*6+1) & 0x04;
+			m_composeLink[pageLinkNumber].level3p5 = packetContents.at(i*6+1) & 0x08;
+
+			m_composeLink[pageLinkNumber].pageNumber = ((packetContents.at(i*6+3) & 0x03) << 9) | ((packetContents.at(i*6+2) & 0x20) << 3) | ((packetContents.at(i*6+3) & 0x3c) << 2) | (packetContents.at(i*6+2) & 0x0f);
+
+			m_composeLink[pageLinkNumber].subPageCodes = (packetContents.at(i*6+4) >> 2) | (packetContents.at(i*6+5) << 4) | (packetContents.at(i*6+6) << 10);
+		}
+		return true;
+	}
 
 	if (packetNumber == 28 && (designationCode == 0 || designationCode == 4)) {
 		int CLUToffset = (designationCode == 0) ? 16 : 0;
@@ -226,7 +266,16 @@ bool LevelOnePage::packetNeeded(int packetNumber, int designationCode) const
 	if (packetNumber == 26)
 		return ((localEnhance.size()+12) / 13) > designationCode;
 
-	// TODO packet 27
+	// TODO packet 27/0
+
+	if (packetNumber == 27 && (designationCode == 4 || designationCode == 5)) {
+		for (int i=0; i<(designationCode == 4 ? 6 : 2); i++) {
+			int pageLinkNumber = i+(designationCode == 4 ? 0 : 6);
+			if ((m_composeLink[pageLinkNumber].pageNumber & 0x0ff) != 0x0ff)
+				return true;
+		}
+		return false;
+	}
 
 	if (packetNumber == 28) {
 		if (designationCode == 0) {
@@ -425,6 +474,31 @@ void LevelOnePage::setRightSidePanelDisplayed(bool newRightSidePanelDisplayed) {
 void LevelOnePage::setSidePanelColumns(int newSidePanelColumns) { m_sidePanelColumns = newSidePanelColumns; }
 void LevelOnePage::setSidePanelStatusL25(bool newSidePanelStatusL25) { m_sidePanelStatusL25 = newSidePanelStatusL25; }
 
+void LevelOnePage::setComposeLinkFunction(int linkNumber, int newFunction)
+{
+	m_composeLink[linkNumber].function = newFunction;
+}
+
+void LevelOnePage::setComposeLinkLevel2p5(int linkNumber, bool newRequired)
+{
+	m_composeLink[linkNumber].level2p5 = newRequired;
+}
+
+void LevelOnePage::setComposeLinkLevel3p5(int linkNumber, bool newRequired)
+{
+	m_composeLink[linkNumber].level3p5 = newRequired;
+}
+
+void LevelOnePage::setComposeLinkPageNumber(int linkNumber, int newPageNumber)
+{
+	m_composeLink[linkNumber].pageNumber = newPageNumber;
+}
+
+void LevelOnePage::setComposeLinkSubPageCodes(int linkNumber, int newSubPageCodes)
+{
+	m_composeLink[linkNumber].subPageCodes = newSubPageCodes;
+}
+
 QString LevelOnePage::colourHash(int whichCLUT)
 {
 	QString resultHash;

levelonepage.h

@@ -86,6 +86,17 @@ public:
 	void setSidePanelColumns(int);
 	bool sidePanelStatusL25() const { return m_sidePanelStatusL25; }
 	void setSidePanelStatusL25(bool);
+	int composeLinkFunction(int linkNumber) const { return m_composeLink[linkNumber].function; }
+	void setComposeLinkFunction(int, int);
+	bool composeLinkLevel2p5(int linkNumber) const { return m_composeLink[linkNumber].level2p5; }
+	void setComposeLinkLevel2p5(int, bool);
+	bool composeLinkLevel3p5(int linkNumber) const { return m_composeLink[linkNumber].level3p5; }
+	void setComposeLinkLevel3p5(int, bool);
+	int composeLinkPageNumber(int linkNumber) const { return m_composeLink[linkNumber].pageNumber; }
+	void setComposeLinkPageNumber(int, int);
+	int composeLinkSubPageCodes(int linkNumber) const { return m_composeLink[linkNumber].subPageCodes; }
+	void setComposeLinkSubPageCodes(int, int);
+
 	QString colourHash(int);
 	QList<X26Triplet> localEnhance;
 
@@ -101,6 +112,12 @@ private:
 	int m_defaultScreenColour, m_defaultRowColour, m_colourTableRemap, m_sidePanelColumns;
 	bool m_blackBackgroundSubst, m_leftSidePanelDisplayed, m_rightSidePanelDisplayed, m_sidePanelStatusL25;
 	int m_CLUT[32];
+	struct composeLink {
+		int function;
+		bool level2p5, level3p5;
+		int pageNumber, subPageCodes;
+	} m_composeLink[8];
+
 	X26Triplet m_paddingX26Triplet;
 
 	const int defaultCLUT[32] = {

pageenhancementsdockwidget.cpp

@@ -20,22 +20,32 @@
 #include <QCheckBox>
 #include <QComboBox>
 #include <QGridLayout>
+#include <QGroupBox>
 #include <QLabel>
+#include <QLineEdit>
+#include <QMap>
+#include <QPair>
 #include <QSpinBox>
+#include <QString>
 
 #include "pageenhancementsdockwidget.h"
 
 PageEnhancementsDockWidget::PageEnhancementsDockWidget(TeletextWidget *parent): QDockWidget(parent)
 {
-	QGridLayout *pageEnhancementsLayout = new QGridLayout;
+	QVBoxLayout *pageEnhancementsLayout = new QVBoxLayout;
 	QWidget *pageEnhancementsWidget = new QWidget;
 
 	m_parentMainWidget = parent;
 
 	this->setObjectName("PageEnhancementsDockWidget");
 	this->setWindowTitle("Page enhancements");
-	pageEnhancementsLayout->addWidget(new QLabel(tr("Default screen colour")), 0, 0, 1, 1);
+
-	pageEnhancementsLayout->addWidget(new QLabel(tr("Default row colour")), 1, 0, 1, 1);
+	QGroupBox *x28GroupBox = new QGroupBox(tr("X/28 enhancements"));
+	QGridLayout *x28Layout = new QGridLayout;
+
+	// Default screen and default row colours
+	x28Layout->addWidget(new QLabel(tr("Default screen colour")), 0, 0, 1, 1);
+	x28Layout->addWidget(new QLabel(tr("Default row colour")), 1, 0, 1, 1);
 	m_defaultScreenColourCombo = new QComboBox;
 	m_defaultRowColourCombo = new QComboBox;
 	for (int r=0; r<=3; r++)
@@ -43,11 +53,13 @@ PageEnhancementsDockWidget::PageEnhancementsDockWidget(TeletextWidget *parent):
 			m_defaultScreenColourCombo->addItem(tr("CLUT %1:%2").arg(r).arg(c));
 			m_defaultRowColourCombo->addItem(tr("CLUT %1:%2").arg(r).arg(c));
 		}
-	pageEnhancementsLayout->addWidget(m_defaultScreenColourCombo, 0, 1, 1, 1, Qt::AlignTop);
+	x28Layout->addWidget(m_defaultScreenColourCombo, 0, 1, 1, 1, Qt::AlignTop);
 	connect(m_defaultScreenColourCombo, QOverload<int>::of(&QComboBox::currentIndexChanged), [=](int index){ m_parentMainWidget->setDefaultScreenColour(index); });
-	pageEnhancementsLayout->addWidget(m_defaultRowColourCombo, 1, 1, 1, 1, Qt::AlignTop);
+	x28Layout->addWidget(m_defaultRowColourCombo, 1, 1, 1, 1, Qt::AlignTop);
 	connect(m_defaultRowColourCombo, QOverload<int>::of(&QComboBox::currentIndexChanged), [=](int index){ m_parentMainWidget->setDefaultRowColour(index); });
-	pageEnhancementsLayout->addWidget(new QLabel(tr("Colour remapping")), 2, 0, 1, 1);
+
+	// CLUT remapping
+	x28Layout->addWidget(new QLabel(tr("CLUT remapping")), 2, 0, 1, 1);
 	m_colourTableCombo = new QComboBox;
 	m_colourTableCombo->addItem("Fore 0  Back 0");
 	m_colourTableCombo->addItem("Fore 0  Back 1");
@@ -57,29 +69,92 @@ PageEnhancementsDockWidget::PageEnhancementsDockWidget(TeletextWidget *parent):
 	m_colourTableCombo->addItem("Fore 2  Back 1");
 	m_colourTableCombo->addItem("Fore 2  Back 2");
 	m_colourTableCombo->addItem("Fore 2  Back 3");
-	pageEnhancementsLayout->addWidget(m_colourTableCombo, 2, 1, 1, 1, Qt::AlignTop);
+	x28Layout->addWidget(m_colourTableCombo, 2, 1, 1, 1, Qt::AlignTop);
 	connect(m_colourTableCombo, QOverload<int>::of(&QComboBox::currentIndexChanged), [=](int index){ m_parentMainWidget->setColourTableRemap(index); });
+
+	// Black background colour substitution
 	m_blackBackgroundSubstAct = new QCheckBox("Black background colour substitution");
-	pageEnhancementsLayout->addWidget(m_blackBackgroundSubstAct, 3, 0, 1, 2, Qt::AlignTop);
+	x28Layout->addWidget(m_blackBackgroundSubstAct, 3, 0, 1, 2, Qt::AlignTop);
 	connect(m_blackBackgroundSubstAct, &QCheckBox::stateChanged, m_parentMainWidget, &TeletextWidget::setBlackBackgroundSubst);
 
-	pageEnhancementsLayout->addWidget(new QLabel(tr("Left side panel columns")), 4, 0, 1, 1);
+	// Side panel columns
+	x28Layout->addWidget(new QLabel(tr("Left side panel columns")), 4, 0, 1, 1);
 	m_leftSidePanelSpinBox = new QSpinBox(this);
 	m_leftSidePanelSpinBox->setMaximum(16);
-	pageEnhancementsLayout->addWidget(m_leftSidePanelSpinBox, 4, 1, 1, 1, Qt::AlignTop);
+	x28Layout->addWidget(m_leftSidePanelSpinBox, 4, 1, 1, 1, Qt::AlignTop);
 	connect(m_leftSidePanelSpinBox, QOverload<int>::of(&QSpinBox::valueChanged), [=](int index){ setLeftSidePanelWidth(index); });
 
-	pageEnhancementsLayout->addWidget(new QLabel(tr("Right side panel columns")), 5, 0, 1, 1);
+	x28Layout->addWidget(new QLabel(tr("Right side panel columns")), 5, 0, 1, 1);
 	m_rightSidePanelSpinBox = new QSpinBox(this);
 	m_rightSidePanelSpinBox->setMaximum(16);
-	pageEnhancementsLayout->addWidget(m_rightSidePanelSpinBox, 5, 1, 1, 1, Qt::AlignTop);
+	x28Layout->addWidget(m_rightSidePanelSpinBox, 5, 1, 1, 1, Qt::AlignTop);
 	connect(m_rightSidePanelSpinBox, QOverload<int>::of(&QSpinBox::valueChanged), [=](int index){ setRightSidePanelWidth(index); });
 
+	// Side panels status
 	m_sidePanelStatusAct = new QCheckBox("Side panels at level 3.5 only");
-	pageEnhancementsLayout->addWidget(m_sidePanelStatusAct, 6, 0, 1, 2, Qt::AlignTop);
+	x28Layout->addWidget(m_sidePanelStatusAct, 6, 0, 1, 2, Qt::AlignTop);
 	connect(m_sidePanelStatusAct, &QCheckBox::stateChanged, m_parentMainWidget, &TeletextWidget::setSidePanelAtL35Only);
 
-	pageEnhancementsLayout->setRowStretch(6, 1);
+	x28GroupBox->setLayout(x28Layout);
+	pageEnhancementsLayout->addWidget(x28GroupBox);
+
+	QGroupBox *x27GroupBox = new QGroupBox(tr("X/27 links - Level 2.5 and 3.5"));
+	QGridLayout *x27Layout = new QGridLayout;
+
+	// Link functions
+	x27Layout->addWidget(new QLabel(tr("GPOP")),  1, 0, 1, 1);
+	x27Layout->addWidget(new QLabel(tr("POP")),   2, 0, 1, 1);
+	x27Layout->addWidget(new QLabel(tr("GDRCS")), 3, 0, 1, 1);
+	x27Layout->addWidget(new QLabel(tr("DRCS")),  4, 0, 1, 1);
+
+	// Labels across the top
+	x27Layout->addWidget(new QLabel(tr("L2.5")), 0, 1, 1, 1);
+	x27Layout->addWidget(new QLabel(tr("L3.5")),  0, 2, 1, 1);
+	x27Layout->addWidget(new QLabel(tr("Page no")), 0, 3, 1, 1);
+	x27Layout->addWidget(new QLabel(tr("Sub pages required")), 0, 4, 1, 1);
+
+	QLabel *level3p5OnlyLabel = new QLabel(tr("Level 3.5 only"));
+	level3p5OnlyLabel->setAlignment(Qt::AlignCenter);
+	x27Layout->addWidget(level3p5OnlyLabel, 5, 0, 1, 5);
+
+	for (int i=0; i<8; i++) {
+		if (i < 4) {
+			// Required at which Levels
+			m_composeLinkLevelCheckbox[i][0] = new QCheckBox(this);
+			x27Layout->addWidget(m_composeLinkLevelCheckbox[i][0], i+1, 1, 1, 1);
+			connect(m_composeLinkLevelCheckbox[i][0], &QCheckBox::stateChanged, [=](bool active) { m_parentMainWidget->document()->currentSubPage()->setComposeLinkLevel2p5(i, active); });
+			m_composeLinkLevelCheckbox[i][1] = new QCheckBox(this);
+			x27Layout->addWidget(m_composeLinkLevelCheckbox[i][1], i+1, 2, 1, 1);
+			connect(m_composeLinkLevelCheckbox[i][1], &QCheckBox::stateChanged, [=](bool active) { m_parentMainWidget->document()->currentSubPage()->setComposeLinkLevel3p5(i, active); });
+		} else {
+			// Selectable link functions for Level 3.5
+			m_composeLinkFunctionComboBox[i-4] = new QComboBox;
+			m_composeLinkFunctionComboBox[i-4]->addItem("GPOP");
+			m_composeLinkFunctionComboBox[i-4]->addItem("POP");
+			m_composeLinkFunctionComboBox[i-4]->addItem("GDRCS");
+			m_composeLinkFunctionComboBox[i-4]->addItem("DRCS");
+			x27Layout->addWidget(m_composeLinkFunctionComboBox[i-4], i+2, 0, 1, 1, Qt::AlignTop);
+			connect(m_composeLinkFunctionComboBox[i-4], QOverload<int>::of(&QComboBox::currentIndexChanged), [=](int index) { m_parentMainWidget->document()->currentSubPage()->setComposeLinkFunction(i, index); } );
+		}
+		// Page link
+		m_composeLinkPageNumberLineEdit[i] = new QLineEdit("100");
+		m_composeLinkPageNumberLineEdit[i]->setMaxLength(3);
+		m_composeLinkPageNumberLineEdit[i]->setInputMask("DHH");
+		// TODO restrict first digit of page number to 1-8
+		x27Layout->addWidget(m_composeLinkPageNumberLineEdit[i], i+(i<4 ? 1 : 2), 3, 1, 1);
+		connect(m_composeLinkPageNumberLineEdit[i], &QLineEdit::textEdited, [=](QString value) { setComposeLinkPageNumber(i, value); } );
+
+		// Sub page numbers required
+		m_composeLinkSubPageNumbersLineEdit[i] = new QLineEdit(this);
+		x27Layout->addWidget(m_composeLinkSubPageNumbersLineEdit[i], i+(i<4 ? 1 : 2), 4, 1, 1);
+		connect(m_composeLinkSubPageNumbersLineEdit[i], &QLineEdit::textEdited, [=](QString value) { setComposeLinkSubPageNumbers(i, value); } );
+	}
+
+	x27GroupBox->setLayout(x27Layout);
+	pageEnhancementsLayout->addWidget(x27GroupBox);
+
+	pageEnhancementsLayout->addStretch(1);
+
 	pageEnhancementsWidget->setLayout(pageEnhancementsLayout);
 	this->setWidget(pageEnhancementsWidget);
 }
@@ -106,6 +181,60 @@ void PageEnhancementsDockWidget::setRightSidePanelWidth(int newRightPanelSize)
 	m_parentMainWidget->setSidePanelWidths(m_leftSidePanelSpinBox->value(), newRightPanelSize);
 }
 
+void PageEnhancementsDockWidget::setComposeLinkPageNumber(int linkNumber, const QString &newPageNumberString)
+{
+	// The LineEdit should check if a valid hex number was entered, but just in case...
+	bool newPageNumberOk;
+	int newPageNumberRead = newPageNumberString.toInt(&newPageNumberOk, 16);
+	if ((!newPageNumberOk) || newPageNumberRead < 0x100 || newPageNumberRead > 0x8ff)
+		return;
+
+	// Stored as page link with relative magazine number, convert from absolute page number that was entered
+	newPageNumberRead ^= (m_parentMainWidget->document()->pageNumber() & 0x700);
+	m_parentMainWidget->document()->currentSubPage()->setComposeLinkPageNumber(linkNumber, newPageNumberRead);
+}
+
+void PageEnhancementsDockWidget::setComposeLinkSubPageNumbers(int linkNumber, const QString &newSubPagesString)
+{
+	int newSubPageCodes = 0x0000;
+
+	if (!newSubPagesString.isEmpty()) {
+		// Turn user-entered comma separated subpages and subpage-ranges into bits
+		// First we do the "comma separated"
+		const QStringList items = newSubPagesString.split(QLatin1Char(','), QString::SkipEmptyParts);
+		// Now see if there's valid single numbers or ranges between the commas
+		for (const QString &item : items) {
+			if (item.isEmpty())
+				return;
+			if (item.contains(QLatin1Char('-'))) {
+				// Dash found, should be a range of subpages: check for two things either side of dash
+				const QStringList rangeItems = item.split('-');
+				if (rangeItems.count() != 2)
+					return;
+				// Now check if the two things are valid numbers 0-15, with first number less than second
+				bool ok1, ok2;
+				const int number1 = rangeItems[0].toInt(&ok1);
+				const int number2 = rangeItems[1].toInt(&ok2);
+				if (!ok1 || !ok2 || number1 < 0 || number2 < 0 || number1 > 15 || number2 > 15 || number2 < number1)
+					return;
+				// Yes, it is a valid range. Apply it to the result
+				for (int i=number1; i<=number2; i++)
+					newSubPageCodes |= (1 << i);
+			} else {
+				// A single thing (maybe extracted between commas): check if the thing is a number 0-15
+				bool ok;
+				const int number = item.toInt(&ok);
+				if (!ok || number < 0 || number > 15)
+					return;
+				// Yes, it is a valid number. Apply it to the result
+				newSubPageCodes |= (1 << number);
+			}
+		}
+	}
+
+	m_parentMainWidget->document()->currentSubPage()->setComposeLinkSubPageCodes(linkNumber, newSubPageCodes);
+}
+
 void PageEnhancementsDockWidget::updateWidgets()
 {
 	int leftSidePanelColumnsResult = 0;
@@ -139,4 +268,64 @@ void PageEnhancementsDockWidget::updateWidgets()
 	m_sidePanelStatusAct->blockSignals(true);
 	m_sidePanelStatusAct->setChecked(!m_parentMainWidget->document()->currentSubPage()->sidePanelStatusL25());
 	m_sidePanelStatusAct->blockSignals(false);
+
+	for (int i=0; i<8; i++) {
+		if (i >= 4) {
+			m_composeLinkFunctionComboBox[i-4]->blockSignals(true);
+			m_composeLinkFunctionComboBox[i-4]->setCurrentIndex(m_parentMainWidget->document()->currentSubPage()->composeLinkFunction(i));
+			m_composeLinkFunctionComboBox[i-4]->blockSignals(false);
+		} else {
+			m_composeLinkLevelCheckbox[i][0]->blockSignals(true);
+			m_composeLinkLevelCheckbox[i][0]->setChecked(m_parentMainWidget->document()->currentSubPage()->composeLinkLevel2p5(i));
+			m_composeLinkLevelCheckbox[i][0]->blockSignals(false);
+			m_composeLinkLevelCheckbox[i][1]->blockSignals(true);
+			m_composeLinkLevelCheckbox[i][1]->setChecked(m_parentMainWidget->document()->currentSubPage()->composeLinkLevel3p5(i));
+			m_composeLinkLevelCheckbox[i][1]->blockSignals(false);
+		}
+		// Stored as page link with relative magazine number, convert to absolute page number for display
+		int absoluteLinkPageNumber = m_parentMainWidget->document()->currentSubPage()->composeLinkPageNumber(i) ^ (m_parentMainWidget->document()->pageNumber() & 0x700);
+		// Fix magazine 0 to 8
+		if ((absoluteLinkPageNumber & 0x700) == 0x000)
+			absoluteLinkPageNumber |= 0x800;
+		m_composeLinkPageNumberLineEdit[i]->blockSignals(true);
+		m_composeLinkPageNumberLineEdit[i]->setText(QString::number(absoluteLinkPageNumber, 16).toUpper());
+		m_composeLinkPageNumberLineEdit[i]->blockSignals(false);
+
+		// Turn subpage bits into user-friendly comma separated numbers and number-ranges
+		QString rangeString;
+
+		if (m_parentMainWidget->document()->currentSubPage()->composeLinkSubPageCodes(i) != 0x0000) {
+			// First build a list of consecutive ranges seen
+			// The "b-index" is based on https://codereview.stackexchange.com/a/90074
+			QMap<int, QPair<int, int>> ranges;
+			int index = 0;
+			for (int b=0; b<16; b++)
+				if ((m_parentMainWidget->document()->currentSubPage()->composeLinkSubPageCodes(i) >> b) & 0x01) {
+					if (!ranges.contains(b-index))
+						ranges.insert(b-index, qMakePair(b, b));
+					else
+						ranges[b-index].second = b;
+					index++;
+				}
+			// Now go through the list and add single numbers or ranges as appropriate
+			QPair<int, int> range;
+			foreach (range, ranges) {
+				// For second and subsequent entries only, append a comma first
+				if (!rangeString.isEmpty())
+					rangeString.append(',');
+				// Append the single number or the first number of the range
+				rangeString.append(QString("%1").arg(range.first));
+				// If that was part of a range and not a single orphaned number
+				if (range.first != range.second) {
+					// Ranges of 3 or more use a dash. A range of 2 can make do with a comma
+					rangeString.append((range.first+1 == range.second) ? ',' : '-');
+					// Append the second number of the range
+					rangeString.append(QString("%1").arg(range.second));
+				}
+			}
+		}
+		m_composeLinkSubPageNumbersLineEdit[i]->blockSignals(true);
+		m_composeLinkSubPageNumbersLineEdit[i]->setText(rangeString);
+		m_composeLinkSubPageNumbersLineEdit[i]->blockSignals(false);
+	}
 }

pageenhancementsdockwidget.h

@@ -23,7 +23,9 @@
 #include <QCheckBox>
 #include <QComboBox>
 #include <QDockWidget>
+#include <QLineEdit>
 #include <QSpinBox>
+#include <QString>
 
 #include "mainwidget.h"
 
@@ -38,11 +40,17 @@ public:
 private:
 	void setLeftSidePanelWidth(int);
 	void setRightSidePanelWidth(int);
+	void setComposeLinkPageNumber(int, const QString &);
+	void setComposeLinkSubPageNumbers(int, const QString &);
 
 	TeletextWidget *m_parentMainWidget;
 	QComboBox *m_defaultScreenColourCombo, *m_defaultRowColourCombo, *m_colourTableCombo;
 	QCheckBox *m_blackBackgroundSubstAct, *m_sidePanelStatusAct;
 	QSpinBox *m_leftSidePanelSpinBox, *m_rightSidePanelSpinBox;
+
+	QCheckBox *m_composeLinkLevelCheckbox[4][2]; // For links 0-3
+	QComboBox *m_composeLinkFunctionComboBox[4]; // For links 4-7; remember to subtract 4!
+	QLineEdit *m_composeLinkPageNumberLineEdit[8], *m_composeLinkSubPageNumbersLineEdit[8];
 };
 
 #endif