mobile/summary: implement firstDiveDate and lastDiveDate

Instead of transporting the global first and last dive date
in the dive summary, calculate it in an external function.
Since we already have time and date functions in qthelper.cpp
implement those functions there. Provide a stub in QMLInterface
so that QML can access these standalone functions.

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

2 files changed, 19 insertions, 0 deletions

diff --git a/core/qthelper.cpp b/core/qthelper.cpp
index 0ad112124..ea5514824 100644
--- a/core/qthelper.cpp
+++ b/core/qthelper.cpp
@@ -948,6 +948,23 @@ char *get_dive_date_c_string(timestamp_t when)
 	return copy_qstring(text);
 }
 
+static QString get_dive_only_date_string(timestamp_t when)
+{
+	QDateTime ts;
+	ts.setMSecsSinceEpoch(when * 1000L);
+	return loc.toString(ts.toUTC(), QString(prefs.date_format));
+}
+
+QString get_first_dive_date_string()
+{
+	return dive_table.nr > 0 ? get_dive_only_date_string(dive_table.dives[0]->when) : gettextFromC::tr("no dives");
+}
+
+QString get_last_dive_date_string()
+{
+	return dive_table.nr > 0 ? get_dive_only_date_string(dive_table.dives[dive_table.nr - 1]->when) : gettextFromC::tr("no dives");
+}
+
 extern "C" char *get_current_date()
 {
 	QDateTime ts(QDateTime::currentDateTime());;
diff --git a/core/qthelper.h b/core/qthelper.h
index 090f4fc6f..bd205228b 100644
--- a/core/qthelper.h
+++ b/core/qthelper.h
@@ -72,6 +72,8 @@ QString render_seconds_to_string(int seconds);
 QString get_dive_duration_string(timestamp_t when, QString hoursText, QString minutesText, QString secondsText = gettextFromC::tr("sec"), QString separator = ":", bool isFreeDive = false);
 QString get_dive_surfint_string(timestamp_t when, QString daysText, QString hoursText, QString minutesText, QString separator = " ", int maxdays = 4);
 QString get_dive_date_string(timestamp_t when);
+QString get_first_dive_date_string();
+QString get_last_dive_date_string();
 QString get_short_dive_date_string(timestamp_t when);
 QString get_trip_date_string(timestamp_t when, int nr, bool getday);
 QString uiLanguage(QLocale *callerLoc);