Dive site: add proximity field to dive site list

Merging dive sites is currently only possible if dive sites are at
the exact same position.

Introduce a field where the user can enter a distance up to which all
dive sites should be listed. These can then be merged.

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

desktop-widgets/locationinformation.cpp

@@ -11,6 +11,7 @@
 #include "core/subsurface-qt/DiveListNotifier.h"
 #include "command.h"
 #include "core/taxonomy.h"
+#include "core/settings/qPrefUnit.h"
 
 #include <QDebug>
 #include <QShowEvent>
@@ -20,7 +21,7 @@
 #include <QDesktopWidget>
 #include <QScrollBar>
 
-LocationInformationWidget::LocationInformationWidget(QWidget *parent) : QGroupBox(parent), diveSite(nullptr)
+LocationInformationWidget::LocationInformationWidget(QWidget *parent) : QGroupBox(parent), diveSite(nullptr), closeDistance(0)
 {
 	ui.setupUi(this);
 	ui.diveSiteMessage->setCloseButtonVisible(false);
@@ -35,6 +36,8 @@ LocationInformationWidget::LocationInformationWidget(QWidget *parent) : QGroupBo
 	ui.diveSiteCoordinates->installEventFilter(this);
 
 	connect(&diveListNotifier, &DiveListNotifier::diveSiteChanged, this, &LocationInformationWidget::diveSiteChanged);
+	connect(qPrefUnits::instance(), &qPrefUnits::unit_systemChanged, this, &LocationInformationWidget::unitsChanged);
+	unitsChanged();
 
 	ui.diveSiteListView->setModel(&filter_model);
 	ui.diveSiteListView->setModelColumn(LocationInformationModel::NAME);
@@ -112,6 +115,17 @@ void LocationInformationWidget::updateLabels()
 	ui.locationTags->setText(constructLocationTags(&diveSite->taxonomy, false));
 }
 
+void LocationInformationWidget::unitsChanged()
+{
+	if (prefs.units.length == units::METERS) {
+		ui.diveSiteDistanceUnits->setText("m");
+		ui.diveSiteDistance->setText(QString::number(lrint(closeDistance / 1000.0)));
+	} else {
+		ui.diveSiteDistanceUnits->setText("ft");
+		ui.diveSiteDistance->setText(QString::number(lrint(mm_to_feet(closeDistance))));
+	}
+}
+
 void LocationInformationWidget::diveSiteChanged(struct dive_site *ds, int field)
 {
 	if (diveSite != ds)
@@ -222,6 +236,16 @@ void LocationInformationWidget::on_diveSiteNotes_editingFinished()
 		Command::editDiveSiteNotes(diveSite, ui.diveSiteNotes->toPlainText());
 }
 
+void LocationInformationWidget::on_diveSiteDistance_textChanged(const QString &s)
+{
+	bool ok;
+	uint64_t d = s.toLongLong(&ok);
+	if (!ok)
+		d = 0;
+	closeDistance = prefs.units.length == units::METERS ? d * 1000 : feet_to_mm(d);
+	filter_model.setDistance(closeDistance);
+}
+
 void LocationInformationWidget::reverseGeocode()
 {
 	location_t location = parseGpsText(ui.diveSiteCoordinates->text());

desktop-widgets/locationinformation.h

@@ -27,17 +27,20 @@ public slots:
 	void on_diveSiteDescription_editingFinished();
 	void on_diveSiteName_editingFinished();
 	void on_diveSiteNotes_editingFinished();
+	void on_diveSiteDistance_textChanged(const QString &s);
 	void reverseGeocode();
 	void mergeSelectedDiveSites();
 private slots:
 	void updateLabels();
 	void diveSiteChanged(struct dive_site *ds, int field);
+	void unitsChanged();
 private:
 	void keyPressEvent(QKeyEvent *e) override;
 	void clearLabels();
 	Ui::LocationInformation ui;
 	GPSLocationInformationModel filter_model;
 	dive_site *diveSite;
+	int64_t closeDistance; // Distance of "close" dive sites in mm
 };
 
 class DiveLocationFilterProxyModel : public QSortFilterProxyModel {

desktop-widgets/locationinformation.ui

@@ -94,9 +94,30 @@
    <item row="9" column="0" colspan="5">
     <widget class="QGroupBox" name="diveSiteGroupBox">
      <property name="title">
-      <string>Dive sites on same coordinates</string>
+      <string>Near dive sites</string>
      </property>
      <layout class="QVBoxLayout" name="verticalLayout">
+      <item>
+       <layout class="QHBoxLayout" name="horizontalLayout">
+        <item>
+         <widget class="QLabel" name="label_8">
+          <property name="text">
+           <string>Show dive sites in the range of:</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QLineEdit" name="diveSiteDistance"/>
+        </item>
+        <item>
+         <widget class="QLabel" name="diveSiteDistanceUnits">
+          <property name="text">
+           <string></string>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </item>
       <item>
        <widget class="QListView" name="diveSiteListView">
         <property name="sizePolicy">

qt-models/divelocationmodel.cpp

@@ -302,15 +302,17 @@ GeoReferencingOptionsModel::GeoReferencingOptionsModel(QObject *parent) : QStrin
 bool GPSLocationInformationModel::filterAcceptsRow(int sourceRow, const QModelIndex &parent) const
 {
 	struct dive_site *ds = sourceModel()->index(sourceRow, LocationInformationModel::DIVESITE, parent).data().value<dive_site *>();
-	if (ds == ignoreDs || ds == RECENTLY_ADDED_DIVESITE)
+	if (!ds || ds == ignoreDs || ds == RECENTLY_ADDED_DIVESITE)
 		return false;
 
-	return ds && same_location(&ds->location, &location);
+	return distance <= 0 ? same_location(&ds->location, &location)
+			     : (int64_t)get_distance(&ds->location, &location) * 1000 <= distance; // We need 64 bit to represent distances in mm
 }
 
 GPSLocationInformationModel::GPSLocationInformationModel(QObject *parent) : QSortFilterProxyModel(parent),
 	ignoreDs(nullptr),
-	location({{0},{0}})
+	location({{0},{0}}),
+	distance(0)
 {
 	setSourceModel(LocationInformationModel::instance());
 }
@@ -327,3 +329,9 @@ void GPSLocationInformationModel::setCoordinates(const location_t &locationIn)
 	location = locationIn;
 	invalidate();
 }
+
+void GPSLocationInformationModel::setDistance(int64_t dist)
+{
+	distance = dist;
+	invalidate();
+}

qt-models/divelocationmodel.h

@@ -62,11 +62,13 @@ class GPSLocationInformationModel : public QSortFilterProxyModel {
 private:
 	const struct dive_site *ignoreDs;
 	location_t location;
+	int64_t distance;
 	bool filterAcceptsRow(int sourceRow, const QModelIndex &source_parent) const override;
 public:
 	GPSLocationInformationModel(QObject *parent = nullptr);
 	void set(const struct dive_site *ignoreDs, const location_t &);
 	void setCoordinates(const location_t &);
+	void setDistance(int64_t dist); // Distance from coordinates in mm
 };
 
 class GeoReferencingOptionsModel : public QStringListModel {