filter: add filter constraint model

Add a model that keeps track of a list of filter constraint and makes
them accessible from Qt. Sadly, this is mostly repetitive boiler-plate
code, but this is due to Qt's model/view-API, which is a perfect example
of how *not* to design a reasonable modern API.

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

1 files changed, 186 insertions, 0 deletions

diff --git a/qt-models/filterconstraintmodel.cpp b/qt-models/filterconstraintmodel.cpp
new file mode 100644
index 000000000..8ccc23d81
--- /dev/null
+++ b/qt-models/filterconstraintmodel.cpp
@@ -0,0 +1,186 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "filterconstraintmodel.h"
+#include "core/qthelper.h"	// for timestamp conversions
+#include <QTime>
+
+FilterConstraintModel::~FilterConstraintModel()
+{
+}
+
+// QTime <-> seconds in integer conversion functions
+static QTime secondsToTime(int seconds)
+{
+	return QTime::fromMSecsSinceStartOfDay(seconds * 1000);
+}
+
+static int timeToSeconds(const QTime &t)
+{
+	return t.msecsSinceStartOfDay() / 1000;
+}
+
+QVariant FilterConstraintModel::data(const QModelIndex &index, int role) const
+{
+	if (!index.isValid() || index.row() >= (int)constraints.size())
+		return QVariant();
+
+	const filter_constraint &constraint = constraints[index.row()];
+
+	switch (role) {
+	case TYPE_ROLE:
+		return constraint.type;
+	case IS_STAR_WIDGET_ROLE:
+		return filter_constraint_is_star(constraint.type);
+	case HAS_DATE_WIDGET_ROLE:
+		return filter_constraint_has_date_widget(constraint.type);
+	case HAS_TIME_WIDGET_ROLE:
+		return filter_constraint_has_time_widget(constraint.type);
+	case NUM_DECIMALS_ROLE:
+		return filter_constraint_num_decimals(constraint.type);
+	case NEGATE_COMBO_ROLE:
+		return filter_constraint_negate_list_translated();
+	case STRING_MODE_COMBO_ROLE:
+		return filter_constraint_has_string_mode(constraint.type) ?
+			filter_constraint_string_mode_list_translated() : QStringList();
+	case RANGE_MODE_COMBO_ROLE:
+		return filter_constraint_has_range_mode(constraint.type) ?
+			filter_constraint_range_mode_list_translated() : QStringList();
+	case MULTIPLE_CHOICE_LIST_ROLE:
+		return filter_contraint_multiple_choice_translated(constraint.type);
+	case STRING_MODE_ROLE:
+		return static_cast<int>(constraint.string_mode);
+	case RANGE_MODE_ROLE:
+		return static_cast<int>(constraint.range_mode);
+	case TYPE_DISPLAY_ROLE:
+		return filter_constraint_type_to_string_translated(constraint.type);
+	case NEGATE_DISPLAY_ROLE:
+		return filter_constraint_negate_to_string_translated(constraint.negate);
+	case STRING_MODE_DISPLAY_ROLE:
+		return filter_constraint_string_mode_to_string_translated(constraint.string_mode);
+	case RANGE_MODE_DISPLAY_ROLE:
+		return filter_constraint_range_mode_to_string_translated(constraint.range_mode);
+	case TYPE_INDEX_ROLE:
+		return filter_constraint_type_to_index(constraint.type);
+	case NEGATE_INDEX_ROLE:
+		return static_cast<int>(constraint.negate);
+	case STRING_MODE_INDEX_ROLE:
+		return filter_constraint_string_mode_to_index(constraint.string_mode);
+	case RANGE_MODE_INDEX_ROLE:
+		return filter_constraint_range_mode_to_index(constraint.range_mode);
+	case UNIT_ROLE:
+		return filter_constraint_get_unit(constraint.type);
+	case STRING_ROLE:
+		return filter_constraint_get_string(constraint);
+	case INTEGER_FROM_ROLE:
+		return filter_constraint_get_integer_from(constraint);
+	case INTEGER_TO_ROLE:
+		return filter_constraint_get_integer_to(constraint);
+	case FLOAT_FROM_ROLE:
+		return filter_constraint_get_float_from(constraint); // Converts from integers to metric or imperial units
+	case FLOAT_TO_ROLE:
+		return filter_constraint_get_float_to(constraint); // Converts from integers to metric or imperial units
+	case TIMESTAMP_FROM_ROLE:
+		return timestampToDateTime(filter_constraint_get_timestamp_from(constraint));
+	case TIMESTAMP_TO_ROLE:
+		return timestampToDateTime(filter_constraint_get_timestamp_to(constraint));
+	case TIME_FROM_ROLE:
+		return secondsToTime(filter_constraint_get_integer_from(constraint));
+	case TIME_TO_ROLE:
+		return secondsToTime(filter_constraint_get_integer_from(constraint));
+	case MULTIPLE_CHOICE_ROLE:
+		return (qulonglong)filter_constraint_get_multiple_choice(constraint);
+	}
+	return QVariant();
+}
+
+bool FilterConstraintModel::setData(const QModelIndex &index, const QVariant &value, int role)
+{
+	if (!index.isValid() || index.row() > (int)constraints.size())
+		return false;
+	filter_constraint &constraint = constraints[index.row()];
+
+	switch (role) {
+	case NEGATE_INDEX_ROLE:
+		constraint.negate = value.value<bool>();
+		break;
+	case STRING_ROLE:
+		filter_constraint_set_stringlist(constraint, value.value<QString>());
+		break;
+	case STRING_MODE_INDEX_ROLE:
+		constraint.string_mode = filter_constraint_string_mode_from_index(value.value<int>());
+		break;
+	case RANGE_MODE_INDEX_ROLE:
+		constraint.range_mode = filter_constraint_range_mode_from_index(value.value<int>());
+		break;
+	case INTEGER_FROM_ROLE:
+		filter_constraint_set_integer_from(constraint, value.value<int>());
+		break;
+	case INTEGER_TO_ROLE:
+		filter_constraint_set_integer_to(constraint, value.value<int>());
+		break;
+	case FLOAT_FROM_ROLE:
+		filter_constraint_set_float_from(constraint, value.value<double>());
+		break;
+	case FLOAT_TO_ROLE:
+		filter_constraint_set_float_to(constraint, value.value<double>());
+		break;
+	case TIMESTAMP_FROM_ROLE:
+		filter_constraint_set_timestamp_from(constraint, dateTimeToTimestamp(value.value<QDateTime>()));
+		break;
+	case TIMESTAMP_TO_ROLE:
+		filter_constraint_set_timestamp_to(constraint, dateTimeToTimestamp(value.value<QDateTime>()));
+		break;
+	case TIME_FROM_ROLE:
+		filter_constraint_set_integer_from(constraint, timeToSeconds(value.value<QTime>()));
+		break;
+	case TIME_TO_ROLE:
+		filter_constraint_set_integer_to(constraint, timeToSeconds(value.value<QTime>()));
+		break;
+	case MULTIPLE_CHOICE_ROLE:
+		filter_constraint_set_multiple_choice(constraint, value.value<uint64_t>());
+		break;
+	default:
+		return false;
+	}
+	emit dataChanged(index, index, QVector<int> { role });
+	return true;
+}
+
+int FilterConstraintModel::rowCount(const QModelIndex&) const
+{
+	return constraints.size();
+}
+
+void FilterConstraintModel::reload(const std::vector<filter_constraint> &constraintsIn)
+{
+	beginResetModel();
+	constraints = constraintsIn;
+	endResetModel();
+}
+
+std::vector<filter_constraint> FilterConstraintModel::getConstraints() const
+{
+	std::vector<filter_constraint> res;
+	res.reserve(constraints.size());
+	for (const filter_constraint &c: constraints) {
+		if (filter_constraint_is_valid(&c))
+			res.push_back(c);
+	}
+	return res;
+}
+
+void FilterConstraintModel::addConstraint(filter_constraint_type type)
+{
+	int count = (int)constraints.size();
+	beginInsertRows(QModelIndex(), count, count);
+	constraints.emplace_back(type);
+	endInsertRows();
+}
+
+void FilterConstraintModel::deleteConstraint(int row)
+{
+	if (row < 0 || row >= (int)constraints.size())
+		return;
+	beginRemoveRows(QModelIndex(), row, row);
+	constraints.erase(constraints.begin() + row);
+	endRemoveRows();
+}