Move QBasicDrag and QSimpleDrag to QtGui.

These are useful as default implementations of
QPlatformIntegration::drag(), instead of having it return 0 which will
lead to crashes in Qt Quick 2 and widgets applications that use drag
and drop.

Task-number: QTBUG-31288

Change-Id: I70efa139306ced5d879def0f74e3a72d3bcd64f7
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>

src/gui/kernel/kernel.pri

@@ -31,6 +31,8 @@ HEADERS += \
         kernel/qplatformclipboard.h \
         kernel/qplatformnativeinterface.h \
         kernel/qplatformmenu.h \
+        kernel/qshapedpixmapdndwindow_p.h \
+        kernel/qsimpledrag_p.h \
         kernel/qsurfaceformat.h \
         kernel/qguiapplication.h \
         kernel/qguiapplication_p.h \
@@ -89,6 +91,8 @@ SOURCES += \
         kernel/qplatformclipboard.cpp \
         kernel/qplatformnativeinterface.cpp \
         kernel/qsessionmanager.cpp \
+        kernel/qshapedpixmapdndwindow.cpp \
+        kernel/qsimpledrag.cpp \
         kernel/qsurfaceformat.cpp \
         kernel/qguiapplication.cpp \
         kernel/qwindow.cpp \

src/gui/kernel/qplatformintegration.cpp

@@ -49,6 +49,7 @@
 #include <QtGui/private/qpixmap_raster_p.h>
 #include <qpa/qplatformscreen_p.h>
 #include <private/qdnd_p.h>
+#include <private/qsimpledrag_p.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -99,7 +100,11 @@ QPlatformClipboard *QPlatformIntegration::clipboard() const
 */
 QPlatformDrag *QPlatformIntegration::drag() const
 {
-    return 0;
+    static QSimpleDrag *drag = 0;
+    if (!drag) {
+        drag = new QSimpleDrag;
+    }
+    return drag;
 }
 #endif
 

src/gui/kernel/qsimpledrag.cpp

@@ -62,7 +62,7 @@
 #include <private/qguiapplication_p.h>
 #include <private/qdnd_p.h>
 
-#include <QtPlatformSupport/private/qshapedpixmapdndwindow_p.h>
+#include <private/qshapedpixmapdndwindow_p.h>
 
 QT_BEGIN_NAMESPACE
 

src/gui/kernel/qsimpledrag_p.h

@@ -56,7 +56,7 @@ class QEventLoop;
 class QDropData;
 class QShapedPixmapWindow;
 
-class QBasicDrag : public QPlatformDrag, public QObject
+class Q_GUI_EXPORT QBasicDrag : public QPlatformDrag, public QObject
 {
 public:
     virtual ~QBasicDrag();
@@ -99,7 +99,7 @@ private:
     QShapedPixmapWindow *m_drag_icon_window;
 };
 
-class QSimpleDrag : public QBasicDrag
+class Q_GUI_EXPORT QSimpleDrag : public QBasicDrag
 {
 public:
     QSimpleDrag();

src/platformsupport/dnd/dnd.pri

@@ -1,6 +0,0 @@
-HEADERS += \
-    $$PWD/qsimpledrag_p.h \
-    $$PWD/qshapedpixmapdndwindow_p.h
-SOURCES += \
-    $$PWD/qsimpledrag.cpp \
-    $$PWD/qshapedpixmapdndwindow.cpp

src/platformsupport/platformsupport.pro

@@ -9,7 +9,6 @@ PRECOMPILED_HEADER = ../corelib/global/qt_pch.h
 
 include(cfsocketnotifier/cfsocketnotifier.pri)
 include(cglconvenience/cglconvenience.pri)
-include(dnd/dnd.pri)
 include(eglconvenience/eglconvenience.pri)
 include(eventdispatchers/eventdispatchers.pri)
 include(fbconvenience/fbconvenience.pri)

src/plugins/platforms/cocoa/qcocoadrag.h

@@ -45,7 +45,7 @@
 #include <Cocoa/Cocoa.h>
 #include <QtGui>
 #include <qpa/qplatformdrag.h>
-#include <QtPlatformSupport/private/qsimpledrag_p.h>
+#include <private/qsimpledrag_p.h>
 
 #include <QtGui/private/qdnd_p.h>
 

src/plugins/platforms/qnx/qqnxintegration.cpp

@@ -89,7 +89,7 @@
 #include <QtGui/QOpenGLContext>
 #endif
 
-#include <QtPlatformSupport/private/qsimpledrag_p.h>
+#include <private/qsimpledrag_p.h>
 
 #include <QtCore/QDebug>
 #include <QtCore/QHash>

src/plugins/platforms/xcb/qxcbdrag.cpp

@@ -57,8 +57,8 @@
 
 #include <qpa/qwindowsysteminterface.h>
 
-#include <QtPlatformSupport/private/qshapedpixmapdndwindow_p.h>
-#include <QtPlatformSupport/private/qsimpledrag_p.h>
+#include <private/qshapedpixmapdndwindow_p.h>
+#include <private/qsimpledrag_p.h>
 
 QT_BEGIN_NAMESPACE
 

src/plugins/platforms/xcb/qxcbdrag.h

@@ -43,7 +43,7 @@
 #define QXCBDRAG_H
 
 #include <qpa/qplatformdrag.h>
-#include <QtPlatformSupport/private/qsimpledrag_p.h>
+#include <private/qsimpledrag_p.h>
 #include <qxcbobject.h>
 #include <xcb/xcb.h>
 #include <qlist.h>