Doc: Compile dropevents snippets

Done-with: Nico Vertriest <nico.vertriest@qt.io>
Task-number: QTBUG-81486
Change-Id: I8d2eebcd82f47c500a215e310b5828f9b7e303c6
Reviewed-by: Topi Reiniö <topi.reinio@qt.io>

src/gui/doc/snippets/dropevents/dropevents.pro

@@ -1,3 +1,6 @@
-HEADERS     = window.h
-SOURCES     = main.cpp \
-              window.cpp
+TEMPLATE = lib
+TARGET = dropevents_snippets
+QT += core gui widgets
+
+SOURCES = \
+    window.cpp

src/gui/doc/snippets/dropevents/window.cpp

@@ -47,10 +47,31 @@
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/
+#include <QComboBox>
+#include <QDragEnterEvent>
+#include <QLabel>
+#include <QMimeData>
+#include <QTextBrowser>
+#include <QVBoxLayout>
+#include <QWidget>
 
-#include <QtGui>
+namespace dropevents {
+class Window : public QWidget
+{
 
-#include "window.h"
+public:
+    explicit Window(QWidget *parent = nullptr);
+
+protected:
+    void dragEnterEvent(QDragEnterEvent *event) override;
+    void dropEvent(QDropEvent *event) override;
+
+private:
+    QComboBox *mimeTypeCombo = nullptr;
+    QTextBrowser *textBrowser = nullptr;
+    QString oldText;
+    QStringList oldMimeTypes;
+};
 
 //! [0]
 Window::Window(QWidget *parent)
@@ -95,3 +116,5 @@ void Window::dropEvent(QDropEvent *event)
     event->acceptProposedAction();
 }
 //! [4]
+
+} // dropevents

src/gui/doc/snippets/snippets.pro

@@ -8,6 +8,7 @@ contains(QT_BUILD_PARTS, tests) {
         code \
         draganddrop \
         droparea \
+        dropevents \
         qfontdatabase \
         textblock-formats \
         textblock-fragments \