QPlatformDialogHelper: Split class hierarchy, decouple from Dialog

- Introduce hierarchy of QPlatformDialogHelper-derived classes
  for font, color and file dialogs.
- Start reducing dependencies on QDialog:
  * Remove QDialog-specifics from interface, introduce enumeration
    for DialogCode
  * Make the helpers Q_OBJECTS to be able to add the signals
    passed on to the QDialogs
  * Remove QDialogPrivate pointer
- Split setVisible_sys() in show_sys() (factory method for native
  dialogs) and hide_sys(). Pass parent window to  show_sys(),
  removing the necessity to query the QDialog for it
- Introduce a styleHint() similar to QGuiApplication's for
  platform-specific
- Fix compile in cocoa/windows, reduce depency on QDialog
  (-private) classes.

Change-Id: Ic1cb715e1edf767f2cb18b9780341d189339ef1d
Reviewed-by: Morten Johan Sørvig <morten.sorvig@nokia.com>

1 files changed, 41 insertions, 2 deletions

diff --git a/src/widgets/kernel/qplatformdialoghelper_qpa.cpp b/src/widgets/kernel/qplatformdialoghelper_qpa.cpp
index 4ad3118053..daf864ff30 100644
--- a/src/widgets/kernel/qplatformdialoghelper_qpa.cpp
+++ b/src/widgets/kernel/qplatformdialoghelper_qpa.cpp
@@ -41,11 +41,50 @@
 
 #include "qplatformdialoghelper_qpa.h"
 
-QPlatformDialogHelper::QPlatformDialogHelper() :
-    d_ptr(0)
+#include <QtCore/QVariant>
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QPlatformDialogHelper
+    \since 5.0
+    \internal
+    \brief The QPlatformDialogHelper class allows for platform-specific customization of dialogs.
+
+*/
+
+/*!
+    \enum QPlatformDialogHelper::StyleHint
+
+    This enum type specifies platform-specific style hints.
+
+    \value SnapToDefaultButton Snap the mouse to the center of the default
+                               button. There is corresponding system
+                               setting on Windows.
+
+    \sa styleHint()
+*/
+
+QPlatformDialogHelper::QPlatformDialogHelper()
 {
 }
 
 QPlatformDialogHelper::~QPlatformDialogHelper()
 {
 }
+
+QVariant QPlatformDialogHelper::styleHint(StyleHint hint) const
+{
+    return QPlatformDialogHelper::defaultStyleHint(hint);
+}
+
+QVariant  QPlatformDialogHelper::defaultStyleHint(QPlatformDialogHelper::StyleHint hint)
+{
+    switch (hint) {
+    case QPlatformDialogHelper::SnapToDefaultButton:
+        return QVariant(false);
+    }
+    return QVariant();
+}
+
+QT_END_NAMESPACE