Add palette() and further hints to QtGui/QPlatformTheme.

- Move palette() from deprecated QtWidgets/QGuiPlatformPlugin
  to  QtGui/QPlatformTheme, Make it return a const * since
  QPalette does not have isNull().
- Initialize QGuiApplication::palette() and
  QApplication::systemPalette() from it.
- Do not initialize QPalette from QGuiApplication::palette()
  unless app_pal is non-null (default to Qt::black if it is 0).
  This avoids initialization order crashes/recursions in the
  QPA plugin. Streamline initialization function.
- Remove styleName(), systemIconThemeName() and iconSearchPaths()
  from QGuiPlatformPlugin and re-add them as
  QPlatformTheme::themeHint().
- Remove styleHint() from QGuiPlatformPlugin, add it to
  QPlatformTheme::themeHint().
- Add UNIX themes with factory function (Generic,
  KDE, Gnome), taking it from Qt 4.8 code (stripping the
  KDE 3 code).
- Implement Windows palettes.

Task-number: QTBUG-24204

Change-Id: Ie27ec035df4f84c42deaffc4816b2e53ce705462
Reviewed-by: Morten Johan Sørvig <morten.sorvig@nokia.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/src/plugins/platforms/windows/qtwindowsglobal.h b/src/plugins/platforms/windows/qtwindowsglobal.h
index 3445a3c7a8..27cfbdc662 100644
--- a/src/plugins/platforms/windows/qtwindowsglobal.h
+++ b/src/plugins/platforms/windows/qtwindowsglobal.h
@@ -60,7 +60,8 @@ enum
     KeyDownEventFlag = 0x200000,
     TouchEventFlag = 0x400000,
     ClipboardEventFlag = 0x800000,
-    ApplicationEventFlag = 0x1000000
+    ApplicationEventFlag = 0x1000000,
+    ThemingEventFlag = 0x2000000
 };
 
 enum WindowsEventType // Simplify event types
@@ -97,6 +98,7 @@ enum WindowsEventType // Simplify event types
     InputMethodOpenCandidateWindowEvent = InputMethodEventFlag + 4,
     InputMethodCloseCandidateWindowEvent = InputMethodEventFlag + 5,
     InputMethodRequest = InputMethodEventFlag + 6,
+    ThemeChanged = ThemingEventFlag + 1,
     DisplayChangedEvent = 437,
     UnknownEvent = 542
 };
@@ -178,6 +180,8 @@ inline QtWindows::WindowsEventType windowsEventType(UINT message, WPARAM wParamI
         return QtWindows::FocusOutEvent;
     case WM_DISPLAYCHANGE:
         return QtWindows::DisplayChangedEvent;
+    case WM_THEMECHANGED:
+        return QtWindows::ThemeChanged;
     default:
         break;
     }