add drag and drop to AppletInfo

add tests for AppletInfo drag and drop support

svn path=/trunk/KDE/kdebase/workspace/plasma/lib/; revision=467639

appletinfo.cpp

@@ -19,7 +19,10 @@ the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 Boston, MA 02110-1301, USA.
 ******************************************************************/
 
-#include <qfileinfo.h>
+#include <QBuffer>
+#include <QFileInfo>
+#include <QMimeData>
+
 #include <kdesktopfile.h>
 #include <kapplication.h>
 
@@ -210,4 +213,36 @@ bool AppletInfo::operator<=(const AppletInfo& rhs) const
     return name().lower() <= rhs.name().lower();
 }
 
+void AppletInfo::populateMimeData(QMimeData* mimeData)
+{
+    QByteArray a;
+    QDataStream s(&a, QIODevice::WriteOnly);
+    s << desktopFilePath();
+    mimeData->setData("application/plasmaAppletInfo", a);
+}
+
+bool AppletInfo::canDecode(const QMimeData* mimeData)
+{
+    return mimeData->hasFormat("application/plasmaAppletInfo");
+}
+
+AppletInfo AppletInfo::fromMimeData(const QMimeData* mimeData)
+{
+    QByteArray a = mimeData->data("application/plasmaAppletInfo");
+
+    if (a.isEmpty())
+    {
+        return AppletInfo();
+    }
+
+    QBuffer buff(&a);
+    buff.open(QIODevice::ReadOnly);
+    QDataStream s(&buff);
+
+    QString desktopFile;
+    s >> desktopFile;
+    AppletInfo info(desktopFile);
+    return info;
+}
+
 } // Plasma namespace

appletinfo.h

@@ -145,6 +145,35 @@ class KDE_EXPORT AppletInfo
          */
         bool operator==(const AppletInfo& rhs) const;
 
+        /**
+         * Part of the drag and drop support for AppletInfo.
+         * Populates a QMimeData object with the necessary data to create an
+         * equivalent AppletInfo object on the receiving end.
+         * @param mimeData a pointer to a QMimeData object. Any Applet Info
+         *                 previously added to this object will be overwritten.
+         */
+        void populateMimeData(QMimeData* mimeData);
+
+        /**
+         * Part of the drag and drop support for AppletInfo.
+         * Returns true if the QMimeData object passed in contains the proper
+         * mimetype for an AppletInfo
+         * @param mimeData a pointer to a QMimeData object which may contain
+         *                 AppletInfo data
+         */
+        static bool canDecode(const QMimeData* mimeData);
+
+        /**
+         * Part of the drag and drop support for AppletInfo.
+         * Given a QMimeData object that contains an AppletInfo, returns a
+         * corresponding AppletInfo object
+         * @param mimeData a pointer to a QMimeData object which should contain
+         *                 AppletInfo data.
+         * @see canDecode
+         */
+        static AppletInfo fromMimeData(const QMimeData* mimeData);
+
+
     private:
         void setName(const QString& name);
         void setComment(const QString& comment);

tests/testAppletInfo.cpp

@@ -19,6 +19,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
 
 #include <QDir>
+#include <QMimeData>
 
 #include <kaboutdata.h>
 #include <kinstance.h>
@@ -245,5 +246,15 @@ void TestAppletInfo::copyConstructor()
     COMPARE(copied.hidden(), notUniqueNative->hidden());
 }
 
+void TestAppletInfo::dragAndDrop()
+{
+    QMimeData* data = new QMimeData;
+    notUniqueNative->populateMimeData(data);
+    VERIFY(Plasma::AppletInfo::canDecode(data));
+    Plasma::AppletInfo dropped = Plasma::AppletInfo::fromMimeData(data);
+    COMPARE(dropped.desktopFile(), notUniqueNative->desktopFile());
+    delete data;
+}
+
 QTTEST_MAIN(TestAppletInfo)
 #include "testAppletInfo.moc"

tests/testAppletInfo.h

@@ -58,6 +58,7 @@ class TestAppletInfo: public QObject
         void hidden();
         void assignment();
         void copyConstructor();
+        void dragAndDrop();
 
     private:
         Plasma::AppletInfo* notUniqueNative;