Doc: Make Qt Gui snippets compilable - clipboard

Task-number: QTBUG-81486
Change-Id: I41b0c5f021ea9fbbe384f224443608f4397dec24
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

src/gui/doc/snippets/clipboard/clipboard.pro

@@ -1,3 +1,10 @@
-HEADERS     = clipwindow.h
-SOURCES     = clipwindow.cpp \
-              main.cpp
+TEMPLATE = lib
+TARGET = clipboard_snippets
+QT += core gui widgets
+
+HEADERS = \
+    clipwindow.h
+
+SOURCES = \
+    clipwindow.cpp \
+    main.cpp

src/gui/doc/snippets/clipboard/clipwindow.cpp

@@ -49,6 +49,7 @@
 ****************************************************************************/
 
 #include <QtWidgets>
+#include <QMimeData>
 
 #include "clipwindow.h"
 
@@ -70,8 +71,6 @@ ClipWindow::ClipWindow(QWidget *parent)
     connect(clipboard, &QClipboard::dataChanged,
             this, &ClipWindow::updateClipboard);
 //! [0]
-    connect(mimeTypeCombo, QOverload<QString>::of(&QComboBox::activated),
-            this, &ClipWindow::updateData);
 
     QVBoxLayout *currentLayout = new QVBoxLayout(currentItem);
     currentLayout->addWidget(mimeTypeLabel);
@@ -92,20 +91,20 @@ ClipWindow::ClipWindow(QWidget *parent)
 void ClipWindow::updateClipboard()
 {
     QStringList formats = clipboard->mimeData()->formats();
-    QByteArray data = clipboard->mimeData()->data(format);
+    for (const auto &format : formats) {
+        QByteArray data = clipboard->mimeData()->data(format);
+        // ...
+    }
 //! [1]
 
     mimeTypeCombo->clear();
-    mimeTypeCombo->insertStringList(formats);
 
     int size = clipboard->mimeData()->data(formats[0]).size();
     QListWidgetItem *newItem = new QListWidgetItem(previousItems);
     newItem->setText(tr("%1 (%2 bytes)").arg(formats[0]).arg(size));
 
     updateData(formats[0]);
-//! [2]
 }
-//! [2]
 
 void ClipWindow::updateData(const QString &format)
 {

src/gui/doc/snippets/snippets.pro

@@ -4,6 +4,7 @@ SUBDIRS =
 contains(QT_BUILD_PARTS, tests) {
     SUBDIRS += \
         brush \
+        clipboard \
         code \
         draganddrop \
         qfontdatabase \

src/gui/doc/src/dnd.qdoc

@@ -377,8 +377,6 @@
     using one of the MIME types that can be used to represent it:
 
     \snippet clipboard/clipwindow.cpp 1
-    \dots
-    \snippet clipboard/clipwindow.cpp 2
 
     The \l{QClipboard::selectionChanged()}{selectionChanged()} signal can
     be used on X11 to monitor the mouse selection.