QML UI: keep QML manager and the UI in sync about selected dive

The manager can now directly update the index of the selected dive, and
the UI tells the manager the timestamp of the currently selected dive.
This allows the manager to pick the best possible dive as selected dive
if things change (for example if the dive list gets reloaded because it
changed in cloud storage).

Fixes #1009

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

mobile-widgets/qml/DiveDetails.qml

@@ -9,6 +9,7 @@ import org.kde.kirigami 1.0 as Kirigami
 Kirigami.Page {
 	id: diveDetailsPage
 	property alias currentIndex: diveDetailsListView.currentIndex
+	property alias currentItem: diveDetailsListView.currentItem
 	property alias dive_id: detailsEdit.dive_id
 	property alias number: detailsEdit.number
 	property alias date: detailsEdit.dateText
@@ -25,6 +26,7 @@ Kirigami.Page {
 	property alias startpressure: detailsEdit.startpressureText
 	property alias endpressure: detailsEdit.endpressureText
 	property alias gasmix: detailsEdit.gasmixText
+	property int updateCurrentIdx: manager.updateSelectedDive
 
 	title: diveDetailsListView.currentItem ? diveDetailsListView.currentItem.modelData.dive.location : "Dive details"
 	state: "view"
@@ -108,6 +110,17 @@ Kirigami.Page {
 		// if we were in view mode, don't accept the event and pop the page
 	}
 
+	onUpdateCurrentIdxChanged: {
+		if (diveDetailsListView.currentIndex != updateCurrentIdx) {
+			diveDetailsListView.currentIndex = updateCurrentIdx
+			manager.selectedDiveTimestamp = diveDetailsListView.currentItem.modelData.dive.timestamp
+		}
+	}
+
+	onCurrentItemChanged: {
+		manager.selectedDiveTimestamp = diveDetailsListView.currentItem.modelData.dive.timestamp
+	}
+
 	function showDiveIndex(index) {
 		currentIndex = index;
 		diveDetailsListView.positionViewAtIndex(index, ListView.Beginning);

mobile-widgets/qmlmanager.cpp

@@ -385,6 +385,8 @@ void QMLManager::loadDivesWithValidCredentials()
 		return;
 	}
 	appendTextToLog("Cloud sync brought newer data, reloading the dive list");
+	timestamp_t currentDiveTimestamp = selectedDiveTimestamp();
+
 	clear_dive_file_data();
 	if (git != dummy_git_repository) {
 		appendTextToLog(QString("have repository and branch %1").arg(branch));
@@ -414,6 +416,7 @@ void QMLManager::loadDivesWithValidCredentials()
 	DiveListModel::instance()->clear();
 	process_dives(false, false);
 	DiveListModel::instance()->addAllDives();
+	setUpdateSelectedDive(dlSortModel->getIdxForId(get_dive_id_closest_to(currentDiveTimestamp)));
 	appendTextToLog(QStringLiteral("%1 dives loaded").arg(dive_table.nr));
 	if (dive_table.nr == 0)
 		setStartPageText(tr("Cloud storage open successfully. No dives in dive list."));
@@ -1128,6 +1131,28 @@ void QMLManager::setSyncToCloud(bool status)
 	emit syncToCloudChanged();
 }
 
+int QMLManager::updateSelectedDive() const
+{
+	return m_updateSelectedDive;
+}
+
+void QMLManager::setUpdateSelectedDive(int idx)
+{
+	m_updateSelectedDive = idx;
+	emit updateSelectedDiveChanged();
+}
+
+int QMLManager::selectedDiveTimestamp() const
+{
+	return m_selectedDiveTimestamp;
+}
+
+void QMLManager::setSelectedDiveTimestamp(int when)
+{
+	m_selectedDiveTimestamp = when;
+	emit selectedDiveTimestampChanged();
+}
+
 qreal QMLManager::lastDevicePixelRatio()
 {
 	return m_lastDevicePixelRatio;

mobile-widgets/qmlmanager.h

@@ -26,6 +26,8 @@ class QMLManager : public QObject {
 	Q_PROPERTY(credentialStatus_t oldStatus READ oldStatus WRITE setOldStatus NOTIFY oldStatusChanged)
 	Q_PROPERTY(int accessingCloud READ accessingCloud WRITE setAccessingCloud NOTIFY accessingCloudChanged)
 	Q_PROPERTY(bool syncToCloud READ syncToCloud WRITE setSyncToCloud NOTIFY syncToCloudChanged)
+	Q_PROPERTY(int updateSelectedDive READ updateSelectedDive WRITE setUpdateSelectedDive NOTIFY updateSelectedDiveChanged)
+	Q_PROPERTY(int selectedDiveTimestamp READ selectedDiveTimestamp WRITE setSelectedDiveTimestamp NOTIFY selectedDiveTimestampChanged)
 
 public:
 	QMLManager();
@@ -81,6 +83,12 @@ public:
 	bool syncToCloud() const;
 	void setSyncToCloud(bool status);
 
+	int updateSelectedDive() const;
+	void setUpdateSelectedDive(int idx);
+
+	int selectedDiveTimestamp() const;
+	void setSelectedDiveTimestamp(int when);
+
 	typedef void (QMLManager::*execute_function_type)();
 	DiveListSortModel *dlSortModel;
 
@@ -144,6 +152,8 @@ private:
 	struct dive_trip *deletedTrip;
 	int m_accessingCloud;
 	bool m_syncToCloud;
+	int m_updateSelectedDive;
+	int m_selectedDiveTimestamp;
 	credentialStatus_t m_credentialStatus;
 	credentialStatus_t m_oldStatus;
 	qreal m_lastDevicePixelRatio;
@@ -164,6 +174,8 @@ signals:
 	void oldStatusChanged();
 	void accessingCloudChanged();
 	void syncToCloudChanged();
+	void updateSelectedDiveChanged();
+	void selectedDiveTimestampChanged();
 	void sendScreenChanged(QScreen *screen);
 };