Address Qt 5 to-do comment for QColorDialog.

- change customColor() to return QColor instead of QRgb.
- change setCustomColor() and setStandardColor() to take
  a QColor instead of QRgb.
- add missing standardColor() getter method.

Task-number: QTBUG-25087
Change-Id: Ic6adb2031ef47f5e9b15fa3560a5322e6847c0bb
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>

dist/changes-5.0.0

@@ -255,6 +255,10 @@ information about a particular change.
 - qMacVersion() has been removed. Use QSysInfo::macVersion() or
   QSysInfo::MacintoshVersion instead.
 
+- QColorDialog::customColor() now returns a QColor value instead of QRgb.
+  QColorDialog::setCustomColor() and QColorDialog::setStandardColor() now
+  take a QColor value for their second parameter instead of QRgb.
+
 ****************************************************************************
 *                           General                                        *
 ****************************************************************************

src/widgets/dialogs/qcolordialog.cpp

@@ -433,36 +433,45 @@ int QColorDialog::customCount()
 /*!
     \since 4.5
 
-    Returns the custom color at the given \a index as a QRgb value.
+    Returns the custom color at the given \a index as a QColor value.
 */
-QRgb QColorDialog::customColor(int index)
+QColor QColorDialog::customColor(int index)
 {
-    return QColorDialogOptions::customColor(index);
+    return QColor(QColorDialogOptions::customColor(index));
 }
 
 /*!
-    Sets the custom color at \a index to the QRgb \a color value.
+    Sets the custom color at \a index to the QColor \a color value.
 
     \note This function does not apply to the Native Color Dialog on the Mac
     OS X platform. If you still require this function, use the
     QColorDialog::DontUseNativeDialog option.
 */
-void QColorDialog::setCustomColor(int index, QRgb color)
+void QColorDialog::setCustomColor(int index, QColor color)
 {
-    QColorDialogOptions::setCustomColor(index, color);
+    QColorDialogOptions::setCustomColor(index, color.rgba());
 }
 
 /*!
-    Sets the standard color at \a  index to the QRgb \a color value.
+    \since 5.0
+
+    Returns the standard color at the given \a index as a QColor value.
+*/
+QColor QColorDialog::standardColor(int index)
+{
+    return QColor(QColorDialogOptions::standardColor(index));
+}
+
+/*!
+    Sets the standard color at \a index to the QColor \a color value.
 
     \note This function does not apply to the Native Color Dialog on the Mac
     OS X platform. If you still require this function, use the
     QColorDialog::DontUseNativeDialog option.
 */
-
-void QColorDialog::setStandardColor(int index, QRgb color)
+void QColorDialog::setStandardColor(int index, QColor color)
 {
-    QColorDialogOptions::setStandardColor(index, color);
+    QColorDialogOptions::setStandardColor(index, color.rgba());
 }
 
 static inline void rgb2hsv(QRgb rgb, int &h, int &s, int &v)

src/widgets/dialogs/qcolordialog.h

@@ -102,12 +102,11 @@ public:
     // obsolete
     static QRgb getRgba(QRgb rgba = 0xffffffff, bool *ok = 0, QWidget *parent = 0);
 
-    // ### Qt 5: use QColor in signatures
     static int customCount();
-    static QRgb customColor(int index);
-    static void setCustomColor(int index, QRgb color);
-    static void setStandardColor(int index, QRgb color);
-
+    static QColor customColor(int index);
+    static void setCustomColor(int index, QColor color);
+    static QColor standardColor(int index);
+    static void setStandardColor(int index, QColor color);
 
 Q_SIGNALS:
     void currentColorChanged(const QColor &color);