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, 7 insertions, 0 deletions

diff --git a/src/widgets/dialogs/qfontdialog_p.h b/src/widgets/dialogs/qfontdialog_p.h
index 8b423f92d8..ef4e933624 100644
--- a/src/widgets/dialogs/qfontdialog_p.h
+++ b/src/widgets/dialogs/qfontdialog_p.h
@@ -57,6 +57,7 @@
 #include "private/qdialog_p.h"
 #include "qfontdatabase.h"
 #include "qfontdialog.h"
+#include "qplatformdialoghelper_qpa.h"
 
 #ifndef QT_NO_FONTDIALOG
 
@@ -80,6 +81,9 @@ public:
         : writingSystem(QFontDatabase::Any)
     { }
 
+    QPlatformFontDialogHelper *platformFontDialogHelper() const
+        { return static_cast<QPlatformFontDialogHelper *>(platformHelper()); }
+
     void updateFamilies();
     void updateStyles();
     void updateSizes();
@@ -156,6 +160,9 @@ public:
 
     static bool sharedFontPanelAvailable;
 #endif
+
+private:
+    virtual void initHelper(QPlatformDialogHelper *);
 };
 
 #endif // QT_NO_FONTDIALOG