Adds Cylinder helper class for cylinder info access in grantlee templates

to allow grantlee to access individual fields of the cylinder_t struct
rather than a string representation of the whole cylinder info using a
grantlee structure like this one:
	<table class="table_class">
		<tr>
			<td>Cylinder</td>
			<td>Start press.</td>
			<td>End press.</td>
			<td>Gas mix</td>
		</tr>
		{% for cylinderObject in dive.cylinderObjects %}
		<tr>
			<td>{{ cylinderObject.description }}</td>
			<td>{{ cylinderObject.startPressure }}</td>
			<td>{{ cylinderObject.endPressure }}</td>
			<td>{{ cylinderObject.gasMix }}</td>
		</tr>
		{% endfor %}
	</table>

Signed-off-by: Tim Wootton <tim@tee-jay.org.uk>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

core/CMakeLists.txt

@@ -86,6 +86,7 @@ set(SUBSURFACE_CORE_LIB_SRCS
 
 	#Subsurface Qt have the Subsurface structs QObjectified for easy access via QML.
 	subsurface-qt/DiveObjectHelper.cpp
+	subsurface-qt/CylinderObjectHelper.cpp
 	subsurface-qt/SettingsObjectWrapper.cpp
 	${SERIAL_FTDI}
 	${PLATFORM_SRC}

core/subsurface-qt/CylinderObjectHelper.cpp

@@ -0,0 +1,37 @@
+#include "CylinderObjectHelper.h"
+#include "../helpers.h"
+
+static QString EMPTY_CYLINDER_STRING = QStringLiteral("");
+CylinderObjectHelper::CylinderObjectHelper(cylinder_t *cylinder) :
+	m_cyl(cylinder) {
+}
+
+CylinderObjectHelper::~CylinderObjectHelper() {
+}
+
+QString CylinderObjectHelper::description() const {
+	if (!m_cyl->type.description)
+		return QString(EMPTY_CYLINDER_STRING);
+	else
+		return QString(m_cyl->type.description);
+}
+
+QString CylinderObjectHelper::size() const {
+	return get_volume_string(m_cyl->type.size, true);
+}
+
+QString CylinderObjectHelper::workingPressure() const {
+	return get_pressure_string(m_cyl->type.workingpressure, true);
+}
+
+QString CylinderObjectHelper::startPressure() const {
+	return get_pressure_string(m_cyl->start, true);
+}
+
+QString CylinderObjectHelper::endPressure() const {
+	return get_pressure_string(m_cyl->end, true);
+}
+
+QString CylinderObjectHelper::gasMix() const {
+	return get_gas_string(m_cyl->gasmix);
+}

core/subsurface-qt/CylinderObjectHelper.h

@@ -0,0 +1,31 @@
+#ifndef CYLINDER_QOBJECT_H
+#define CYLINDER_QOBJECT_H
+
+#include "../dive.h"
+#include <QObject>
+#include <QString>
+
+class CylinderObjectHelper : public QObject {
+	Q_OBJECT
+	Q_PROPERTY(QString description READ description CONSTANT)
+	Q_PROPERTY(QString size READ size CONSTANT)
+	Q_PROPERTY(QString workingPressure READ workingPressure CONSTANT)
+	Q_PROPERTY(QString startPressure READ startPressure CONSTANT)
+	Q_PROPERTY(QString endPressure READ endPressure CONSTANT)
+	Q_PROPERTY(QString gasMix READ gasMix CONSTANT)
+public:
+	CylinderObjectHelper(cylinder_t *cylinder = NULL);
+	~CylinderObjectHelper();
+	QString description() const;
+	QString size() const;
+	QString workingPressure() const;
+	QString startPressure() const;
+	QString endPressure() const;
+	QString gasMix() const;
+
+private:
+	cylinder_t *m_cyl;
+};
+
+	Q_DECLARE_METATYPE(CylinderObjectHelper *)
+#endif

core/subsurface-qt/DiveObjectHelper.cpp

@@ -55,10 +55,18 @@ static QString getPressures(struct dive *dive, enum returnPressureSelector ret)
 DiveObjectHelper::DiveObjectHelper(struct dive *d) :
 	m_dive(d)
 {
+	m_cyls.clear();
+	for (int i = 0; i < MAX_CYLINDERS; i++) {
+		//Don't add blank cylinders, only those that have been defined.
+		if (m_dive->cylinder[i].type.description)
+			m_cyls.append(new CylinderObjectHelper(&m_dive->cylinder[i]));
+	}
 }
 
 DiveObjectHelper::~DiveObjectHelper()
 {
+while (!m_cyls.isEmpty())
+    delete m_cyls.takeFirst();
 }
 
 int DiveObjectHelper::number() const
@@ -275,6 +283,11 @@ QString DiveObjectHelper::cylinder(int idx) const
 	return getFormattedCylinder(m_dive, idx);
 }
 
+QList<CylinderObjectHelper*> DiveObjectHelper::cylinderObjects() const
+{
+	return m_cyls;
+}
+
 QString DiveObjectHelper::trip() const
 {
 	return m_dive->divetrip ? m_dive->divetrip->location : EMPTY_DIVE_STRING;

core/subsurface-qt/DiveObjectHelper.h

@@ -2,6 +2,7 @@
 #define DIVE_QOBJECT_H
 
 #include "../dive.h"
+#include "CylinderObjectHelper.h"
 #include <QObject>
 #include <QString>
 #include <QStringList>
@@ -34,6 +35,7 @@ class DiveObjectHelper : public QObject {
 	Q_PROPERTY(QString suit READ suit CONSTANT)
 	Q_PROPERTY(QString cylinderList READ cylinderList CONSTANT)
 	Q_PROPERTY(QStringList cylinders READ cylinders CONSTANT)
+	Q_PROPERTY(QList<CylinderObjectHelper*> cylinderObjects READ cylinderObjects CONSTANT)
 	Q_PROPERTY(QString trip READ trip CONSTANT)
 	Q_PROPERTY(QString tripMeta READ tripMeta CONSTANT)
 	Q_PROPERTY(int maxcns READ maxcns CONSTANT)
@@ -77,6 +79,7 @@ public:
 	QString cylinderList() const;
 	QStringList cylinders() const;
 	QString cylinder(int idx) const;
+	QList<CylinderObjectHelper*> cylinderObjects() const;
 	QString trip() const;
 	QString tripMeta() const;
 	int maxcns() const;
@@ -92,6 +95,7 @@ public:
 
 private:
 	struct dive *m_dive;
+	QList<CylinderObjectHelper*> m_cyls;
 };
 	Q_DECLARE_METATYPE(DiveObjectHelper *)