filter: add (very primitive) filterpresetmodel

Implement a trivial model to provide the filter preset names
to the UI. Sadly, for now this features the QWidget/QML
column / name dichotomy. However, in this simple case that
shouldn't be too much of an issue.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

packaging/ios/Subsurface-mobile.pro

@@ -146,6 +146,7 @@ SOURCES += ../../subsurface-mobile-main.cpp \
 	../../qt-models/models.cpp \
 	../../qt-models/weightsysteminfomodel.cpp \
 	../../qt-models/filterconstraintmodel.cpp \
+	../../qt-models/filterpresetmodel.cpp \
 	../../profile-widget/qmlprofile.cpp \
 	../../profile-widget/divecartesianaxis.cpp \
 	../../profile-widget/diveeventitem.cpp \
@@ -297,6 +298,7 @@ HEADERS += \
 	../../qt-models/models.h \
 	../../qt-models/weightsysteminfomodel.h \
 	../../qt-models/filterconstraintmodel.h \
+	../../qt-models/filterpresetmodel.h \
 	../../profile-widget/qmlprofile.h \
 	../../profile-widget/diveprofileitem.h \
 	../../profile-widget/profilewidget2.h \

qt-models/CMakeLists.txt

@@ -21,6 +21,8 @@ set(SUBSURFACE_GENERIC_MODELS_LIB_SRCS
 	divetripmodel.h
 	filterconstraintmodel.cpp
 	filterconstraintmodel.h
+	filterpresetmodel.cpp
+	filterpresetmodel.h
 	maplocationmodel.cpp
 	maplocationmodel.h
 	models.cpp

qt-models/filterpresetmodel.cpp

@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "filterpresetmodel.h"
+#include "core/filterconstraint.h"
+#include "core/filterpreset.h"
+#include "core/qthelper.h"
+#include "core/subsurface-qt/divelistnotifier.h"
+
+FilterPresetModel::FilterPresetModel()
+{
+	setHeaderDataStrings(QStringList{ "", tr("Name") });
+	connect(&diveListNotifier, &DiveListNotifier::dataReset, this, &FilterPresetModel::reset);
+}
+
+FilterPresetModel::~FilterPresetModel()
+{
+}
+
+FilterPresetModel *FilterPresetModel::instance()
+{
+	static FilterPresetModel self;
+	return &self;
+}
+
+QVariant FilterPresetModel::data(const QModelIndex &index, int role) const
+{
+	if (!index.isValid() || index.row() >= filter_presets_count())
+		return QVariant();
+
+	switch (role) {
+	case Qt::DisplayRole:
+		if (index.column() == NAME)
+			return filter_preset_name_qstring(index.row());
+		break;
+	case Qt::DecorationRole:
+		if (index.column() == REMOVE)
+			return trashIcon();
+		break;
+	case Qt::SizeHintRole:
+		if (index.column() == REMOVE)
+			return trashIcon().size();
+		break;
+	case Qt::ToolTipRole:
+		if (index.column() == REMOVE)
+			return tr("Clicking here will remove this filter set.");
+		break;
+	}
+	return QVariant();
+}
+
+int FilterPresetModel::rowCount(const QModelIndex &parent) const
+{
+	return filter_presets_count();
+}
+
+void FilterPresetModel::reset()
+{
+	beginResetModel();
+	endResetModel();
+}

qt-models/filterpresetmodel.h

@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0
+#ifndef FILTERPRESETMODEL_H
+#define FILTERPRESETMODEL_H
+
+#include "cleanertablemodel.h"
+#include "core/filterpreset.h"
+
+class FilterPresetModel : public CleanerTableModel {
+	Q_OBJECT
+public:
+	// For QML we will have to define roles
+	enum Column {
+		REMOVE,
+		NAME
+	};
+private
+slots:
+	void reset();
+public:
+	// there is one global filter preset list, therefore this model is a singleton
+	static FilterPresetModel *instance();
+private:
+	FilterPresetModel();
+	~FilterPresetModel();
+	QVariant data(const QModelIndex &index, int role) const override;
+	int rowCount(const QModelIndex &parent) const override;
+	std::vector<filter_constraint> constraints;
+};
+
+#endif