QBasicTimer: replace new qint64 overloads with chrono ones

Found in API review.

As per "chrono first" initiative[1], implement the int overload via the
chrono one, not vice versa

[1] https://lists.qt-project.org/pipermail/development/2023-January/043563.html

Pick-to: 6.5
Change-Id: I65fe7039ad8ae5f9eb21d9c59a46b9c5c152fac3
Reviewed-by: Anton Kudryavtsev <antkudr@mail.ru>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

src/corelib/compat/removed_api.cpp

@@ -270,17 +270,7 @@ QT_WARNING_POP
 
 #if QT_CORE_REMOVED_SINCE(6, 5)
 
-#include "qbasictimer.h"
-
-void QBasicTimer::start(int msec, QObject *obj)
-{
-    start(qint64(msec), obj);
-}
-
-void QBasicTimer::start(int msec, Qt::TimerType timerType, QObject *obj)
-{
-    start(qint64(msec), timerType, obj);
-}
+#include "qbasictimer.h" // inlined API
 
 #include "qbuffer.h" // inline removed API
 

src/corelib/kernel/qbasictimer.cpp

@@ -102,42 +102,50 @@ QT_BEGIN_NAMESPACE
 */
 
 /*!
-    \fn void QBasicTimer::start(qint64 msec, QObject *object)
+    \fn void QBasicTimer::start(int msec, QObject *object)
 
-    Starts (or restarts) the timer with a \a msec milliseconds timeout. The
+    \obsolete Use chrono overload instead.
+*/
+
+/*!
+    \since 6.5
+
+    Starts (or restarts) the timer with a \a duration timeout. The
     timer will be a Qt::CoarseTimer. See Qt::TimerType for information on the
     different timer types.
 
     The given \a object will receive timer events.
 
-    \note In Qt versions prior to 6.5, \a msec was \c{int}, not
-    \c{qint64}.
-
     \sa stop(), isActive(), QObject::timerEvent(), Qt::CoarseTimer
  */
-void QBasicTimer::start(qint64 msec, QObject *obj)
+void QBasicTimer::start(std::chrono::milliseconds duration, QObject *object)
 {
-    start(msec, Qt::CoarseTimer, obj);
+    start(duration, Qt::CoarseTimer, object);
 }
 
 /*!
+    \fn QBasicTimer::start(int msec, Qt::TimerType timerType, QObject *obj)
     \overload
+    \obsolete
 
-    Starts (or restarts) the timer with a \a msec milliseconds timeout and the
+    Use chrono overload instead.
+*/
+
+/*!
+    \since 6.5
+
+    Starts (or restarts) the timer with a \a duration timeout and the
     given \a timerType. See Qt::TimerType for information on the different
     timer types.
 
     \a obj will receive timer events.
 
-    \note In Qt versions prior to 6.5, \a msec was \c{int}, not
-    \c{qint64}.
-
     \sa stop(), isActive(), QObject::timerEvent(), Qt::TimerType
  */
-void QBasicTimer::start(qint64 msec, Qt::TimerType timerType, QObject *obj)
+void QBasicTimer::start(std::chrono::milliseconds duration, Qt::TimerType timerType, QObject *obj)
 {
     QAbstractEventDispatcher *eventDispatcher = QAbstractEventDispatcher::instance();
-    if (Q_UNLIKELY(msec < 0)) {
+    if (Q_UNLIKELY(duration.count() < 0)) {
         qWarning("QBasicTimer::start: Timers cannot have negative timeouts");
         return;
     }
@@ -151,7 +159,7 @@ void QBasicTimer::start(qint64 msec, Qt::TimerType timerType, QObject *obj)
     }
     stop();
     if (obj)
-        id = eventDispatcher->registerTimer(msec, timerType, obj);
+        id = eventDispatcher->registerTimer(duration.count(), timerType, obj);
 }
 
 /*!

src/corelib/kernel/qbasictimer.h

@@ -7,6 +7,8 @@
 #include <QtCore/qglobal.h>
 #include <QtCore/qnamespace.h>
 
+#include <chrono>
+
 QT_BEGIN_NAMESPACE
 
 
@@ -31,16 +33,28 @@ public:
 
     bool isActive() const noexcept { return id != 0; }
     int timerId() const noexcept { return id; }
-#if QT_CORE_REMOVED_SINCE(6, 5)
+    QT_CORE_INLINE_SINCE(6, 5)
     void start(int msec, QObject *obj);
+    QT_CORE_INLINE_SINCE(6, 5)
     void start(int msec, Qt::TimerType timerType, QObject *obj);
-#endif
-    void start(qint64 msec, QObject *obj);
-    void start(qint64 msec, Qt::TimerType timerType, QObject *obj);
+    void start(std::chrono::milliseconds duration, QObject *obj);
+    void start(std::chrono::milliseconds duration, Qt::TimerType timerType, QObject *obj);
     void stop();
 };
 Q_DECLARE_TYPEINFO(QBasicTimer, Q_RELOCATABLE_TYPE);
 
+#if QT_CORE_INLINE_IMPL_SINCE(6, 5)
+void QBasicTimer::start(int msec, QObject *obj)
+{
+    start(std::chrono::milliseconds{msec}, obj);
+}
+
+void QBasicTimer::start(int msec, Qt::TimerType t, QObject *obj)
+{
+    start(std::chrono::milliseconds{msec}, t, obj);
+}
+#endif
+
 inline void swap(QBasicTimer &lhs, QBasicTimer &rhs) noexcept { lhs.swap(rhs); }
 
 QT_END_NAMESPACE