Doc: Clean up widget snippets project

The main snippets project must be a subdirs project.
Move some files and update the affected documentation.

Task-number: QTBUG-86497
Change-Id: I60073d1b8bd53aa09600eeccf06ba8457ac7c708
Reviewed-by: Venugopal Shivashankar <[email protected]>
(cherry picked from commit e7c15a6)
Reviewed-by: Qt Cherry-pick Bot <[email protected]>

src/widgets/dialogs/qfiledialog.cpp

@@ -410,7 +410,7 @@ QFileDialog::~QFileDialog()
 
     For instance:
 
-    \snippet filedialogurls.cpp 0
+    \snippet filedialogurls/filedialogurls.cpp 0
 
     The file dialog will then look like this:
 

src/widgets/doc/snippets/filedialogurls.cpp → src/widgets/doc/snippets/filedialogurls/filedialogurls.cpp

@@ -48,8 +48,8 @@
 **
 ****************************************************************************/
 
-#include <QtGui>
 #include <QFileDialog>
+#include <QtGui>
 
 int loadFileDialog()
 {

src/widgets/doc/snippets/graphicssceneadditemsnippet.cpp → src/widgets/doc/snippets/graphicssceneadditem/graphicssceneadditemsnippet.cpp

@@ -48,10 +48,10 @@
 **
 ****************************************************************************/
 
-#include <QtGui>
-#include <QGraphicsScene>
 #include <QGraphicsEllipseItem>
+#include <QGraphicsScene>
 #include <QStyleOptionGraphicsItem>
+#include <QtGui>
 
 class CustomScene : public QGraphicsScene
 {

src/widgets/doc/snippets/graphicsview.cpp → src/widgets/doc/snippets/graphicsview/graphicsview.cpp

@@ -47,14 +47,14 @@
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/
+#include <QDrag>
+#include <QGraphicsSceneMouseEvent>
 #include <QGraphicsView>
+#include <QMimeData>
 #include <QOpenGLWidget>
-#include <QPrinter>
 #include <QPrintDialog>
+#include <QPrinter>
 #include <QStandardItem>
-#include <QMimeData>
-#include <QDrag>
-#include <QGraphicsSceneMouseEvent>
 
 void graphicsview_snippet_main()
 {

src/widgets/doc/snippets/snippets.pro

@@ -4,11 +4,11 @@ TARGET = widgets_snippets
 
 QT += widgets printsupport
 
-SOURCES += customviewstyle.cpp \
-           filedialogurls.cpp \
-           graphicssceneadditemsnippet.cpp \
-           graphicsview.cpp \
-           mdiareasnippets.cpp \
-           myscrollarea.cpp
+SOURCES += customviewstyle/customviewstyle.cpp \
+           filedialogurls/filedialogurls.cpp \
+           graphicssceneadditem/graphicssceneadditemsnippet.cpp \
+           graphicsview/graphicsview.cpp \
+           mdiarea/mdiareasnippets.cpp \
+           myscrollarea/myscrollarea.cpp
 
 load(qt_common)

src/widgets/doc/src/graphicsview.qdoc

@@ -89,7 +89,7 @@
         descending stacking order (i.e., the first returned item is topmost,
         and the last item is bottom-most).
 
-        \snippet graphicsview.cpp 0
+        \snippet graphicsview/graphicsview.cpp 0
 
         QGraphicsScene's event propagation architecture schedules scene events
         for delivery to items, and also manages propagation between items. If
@@ -120,7 +120,7 @@
         enable OpenGL support, you can set a QOpenGLWidget as the viewport by
         calling QGraphicsView::setViewport().
 
-        \snippet graphicsview.cpp 1
+        \snippet graphicsview/graphicsview.cpp 1
 
         The view receives input events from the keyboard and mouse, and
         translates these to scene events (converting the coordinates used
@@ -327,7 +327,7 @@
         Here is an example of how to implement zoom and rotate slots in a
         subclass of QGraphicsView:
 
-        \snippet graphicsview_snippet.cpp 2
+        \snippet graphicsview/graphicsview_snippet.cpp 2
 
         The slots could be connected to \l{QToolButton}{QToolButtons} with
         \l{QAbstractButton::autoRepeat}{autoRepeat} enabled.
@@ -347,7 +347,7 @@
         a QPainter to either of the rendering functions. This example shows
         how to print the whole scene into a full page, using QPrinter.
 
-        \snippet graphicsview.cpp 3
+        \snippet graphicsview/graphicsview.cpp 3
 
         The difference between the scene and view rendering functions is that
         one operates in scene coordinates, and the other in view coordinates.
@@ -358,7 +358,7 @@
         is to render the exact contents of the viewport using the provided
         painter.
 
-        \snippet graphicsview.cpp 4
+        \snippet graphicsview/graphicsview.cpp 4
 
         When the source and target areas' sizes do not match, the source
         contents are stretched to fit into the target area. By passing a
@@ -384,7 +384,7 @@
         so in mousePressEvent() or mouseMoveEvent(), you can get the
         originating widget pointer from the event. For example:
 
-        \snippet graphicsview.cpp 5
+        \snippet graphicsview/graphicsview.cpp 5
 
         To intercept drag and drop events for the scene, you reimplement
         QGraphicsScene::dragEnterEvent() and whichever event handlers your
@@ -443,7 +443,7 @@
 
         Example:
 
-        \snippet graphicsview.cpp 6
+        \snippet graphicsview/graphicsview.cpp 6
 
       \section2 Item Groups
 

src/widgets/graphicsview/qgraphicsscene.cpp

@@ -5362,7 +5362,7 @@ void QGraphicsScenePrivate::processDirtyItemsRecursive(QGraphicsItem *item, bool
 
     Example:
 
-    \snippet graphicssceneadditemsnippet.cpp 0
+    \snippet graphicssceneadditem/graphicssceneadditemsnippet.cpp 0
 
     Since Qt 4.6, this function is not called anymore unless
     the QGraphicsView::IndirectPainting flag is given as an Optimization

src/widgets/styles/qstyle.cpp

@@ -372,7 +372,7 @@ static int unpackControlTypes(QSizePolicy::ControlTypes controls, QSizePolicy::C
     We include a small example where we customize the drawing of item
     backgrounds.
 
-    \snippet customviewstyle.cpp 0
+    \snippet customviewstyle/customviewstyle.cpp 0
 
     The primitive element PE_PanelItemViewItem is responsible for
     painting the background of items, and is called from

src/widgets/widgets/qabstractscrollarea.cpp

@@ -127,13 +127,13 @@ QT_BEGIN_NAMESPACE
     QWidget::move(). When the area contents or the viewport size
     changes, we do the following:
 
-    \snippet myscrollarea.cpp 1
+    \snippet myscrollarea/myscrollarea.cpp 1
 
     When the scroll bars change value, we need to update the widget
     position, i.e., find the part of the widget that is to be drawn in
     the viewport:
 
-    \snippet myscrollarea.cpp 0
+    \snippet myscrollarea/myscrollarea.cpp 0
 
     In order to track scroll bar movements, reimplement the virtual
     function scrollContentsBy(). In order to fine-tune scrolling

src/widgets/widgets/qmdiarea.cpp

@@ -51,7 +51,7 @@
     applications, but can also be placed in any layout. The following
     code adds an area to a main window:
 
-    \snippet mdiareasnippets.cpp 0
+    \snippet mdiarea/mdiareasnippets.cpp 0
 
     Unlike the window managers for top-level windows, all window flags
     (Qt::WindowFlags) are supported by QMdiArea as long as the flags
@@ -1950,7 +1950,7 @@ void QMdiArea::activatePreviousSubWindow()
     \note Once the subwindow has been added, its parent will be the
     \e{viewport widget} of the QMdiArea.
 
-    \snippet mdiareasnippets.cpp 1
+    \snippet mdiarea/mdiareasnippets.cpp 1
 
     When you create your own subwindow, you must set the
     Qt::WA_DeleteOnClose widget attribute if you want the window to be