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, 5 insertions, 0 deletions

diff --git a/src/widgets/dialogs/qcolordialog_p.h b/src/widgets/dialogs/qcolordialog_p.h
index b2413f1418..39d7192b1d 100644
--- a/src/widgets/dialogs/qcolordialog_p.h
+++ b/src/widgets/dialogs/qcolordialog_p.h
@@ -75,6 +75,9 @@ class QColorDialogPrivate : public QDialogPrivate
     Q_DECLARE_PUBLIC(QColorDialog)
 
 public:
+    QPlatformColorDialogHelper *platformColorDialogHelper() const
+        { return static_cast<QPlatformColorDialogHelper *>(platformHelper()); }
+
     void init(const QColor &initial);
     QRgb currentColor() const;
     QColor currentQColor() const;
@@ -133,6 +136,8 @@ public:
     void _q_macRunNativeAppModalPanel();
     void mac_nativeDialogModalHelp();
 #endif
+private:
+    virtual void initHelper(QPlatformDialogHelper *h);
 };
 
 #endif // QT_NO_COLORDIALOG