libs: drop the automatic update feature of Plasma::Calendar

only Plasma::ClockApplet uses the Plasma::Calendar class and it disables
automatic updates (because the date comes from data engine). also due to
7819796c55 the date is updated once a second
which was updating the currently selected date thus interfering with date
selection every second so the check that was removed in
d7d63a156b had to be brought back

Signed-off-by: Ivailo Monev <xakepa10@gmail.com>

libs/plasmaclock/calendar.cpp

@@ -70,8 +70,7 @@ class CalendarPrivate
             : q(calendar),
               calendarWidget(nullptr),
               layout(nullptr),
-              currentDate(QDate::currentDate()),
-              automaticUpdates(true)
+              currentDate(QDate::currentDate())
         {
         }
 
@@ -83,7 +82,6 @@ class CalendarPrivate
         Plasma::CalendarWidget *calendarWidget;
         QGraphicsLinearLayout *layout;
         QDate currentDate;
-        bool automaticUpdates;
 };
 
 Calendar::Calendar(const QDate &date, QGraphicsWidget *parent)
@@ -122,30 +120,12 @@ void CalendarPrivate::init(const QDate &initialDate)
     updateSize();
 }
 
-void Calendar::showEvent(QShowEvent * event)
-{
-    if (d->automaticUpdates) {
-        d->currentDate = QDate::currentDate();
-    }
-    QGraphicsWidget::showEvent(event);
-}
-
 void Calendar::focusInEvent(QFocusEvent* event)
 {
     Q_UNUSED(event);
     d->calendarWidget->setFocus();
 }
 
-void Calendar::setAutomaticUpdateEnabled(bool automatic)
-{
-    d->automaticUpdates = automatic;
-}
- 
-bool Calendar::isAutomaticUpdateEnabled() const
-{
-    return d->automaticUpdates;
-}
-
 void Calendar::setDate(const QDate &toDate)
 {
     // New date must be valid one
@@ -156,10 +136,9 @@ void Calendar::setDate(const QDate &toDate)
         return;
     }
 
-    // NOTE: this method is called by Plasma::ClockApplet::popupEvent() on show so updating as if
-    // show event ocurred
-    if (d->automaticUpdates) {
-        d->currentDate = QDate::currentDate();
+    // If new date is the same as old date don't actually need to do anything
+    if (toDate == d->currentDate) {
+        return;
     }
 
     d->calendarWidget->setSelectedDate(toDate);

libs/plasmaclock/calendar.h

@@ -57,7 +57,6 @@ Q_SIGNALS:
     void dateChanged(const QDate &newDate);
 
 protected:
-    void showEvent(QShowEvent * event);
     void focusInEvent(QFocusEvent* event);
 
 private Q_SLOTS:

libs/plasmaclock/clockapplet.cpp

@@ -124,7 +124,6 @@ public:
         if (q->config().readEntry("ShowCalendarPopup", true)) {
             if (!calendarWidget) {
                 calendarWidget = new Plasma::Calendar();
-                calendarWidget->setAutomaticUpdateEnabled(false);
                 calendarWidget->setFlag(QGraphicsItem::ItemIsFocusable);
             }
         } else {
@@ -257,12 +256,7 @@ void ClockApplet::updateClockApplet()
 void ClockApplet::updateClockApplet(const Plasma::DataEngine::Data &data)
 {
     if (d->calendarWidget) {
-        bool updateSelectedDate = (d->calendarWidget->currentDate() == d->calendarWidget->date());
-        d->calendarWidget->setCurrentDate(data["Date"].toDate());
-
-        if (updateSelectedDate){
-            d->calendarWidget->setDate(d->calendarWidget->currentDate());
-        }
+        d->calendarWidget->setDate(data["Date"].toDate());
     }
 
     d->lastTimeSeen = data["Time"].toTime();
@@ -506,7 +500,10 @@ void ClockApplet::popupEvent(bool show)
 {
     if (show && d->calendarWidget) {
         Plasma::DataEngine::Data data = dataEngine("time")->query(currentTimezone());
-        d->calendarWidget->setDate(data["Date"].toDate());
+        const QDate date = data["Date"].toDate();
+        d->calendarWidget->setCurrentDate(date.addDays(-1));
+        d->calendarWidget->setDate(date);
+        d->calendarWidget->setCurrentDate(date);
     }
 }