tdf#120772: implement file manager -> LibO DnD

not sure if we should support also other than URL list mimetypes

Change-Id: Ida3f65637247822198b04682a3d1a7c196a24e0c
Reviewed-on: https://gerrit.libreoffice.org/66997
Tested-by: Jenkins
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>

vcl/inc/qt5/Qt5DragAndDrop.hxx

@@ -11,6 +11,7 @@
 #pragma once
 
 #include <cppuhelper/compbase.hxx>
+#include <Qt5Clipboard.hxx>
 
 #include <com/sun/star/datatransfer/dnd/XDragSource.hpp>
 #include <com/sun/star/datatransfer/dnd/XDropTarget.hpp>
@@ -18,6 +19,20 @@
 #include <com/sun/star/lang/XServiceInfo.hpp>
 
 class Qt5Frame;
+class QMimeData;
+
+class Qt5DnDTransferable : public Qt5Transferable
+{
+public:
+    Qt5DnDTransferable(const QMimeData* pMimeData);
+    virtual css::uno::Any SAL_CALL
+    getTransferData(const css::datatransfer::DataFlavor& rFlavor) override;
+
+    virtual std::vector<css::datatransfer::DataFlavor> getTransferDataFlavorsAsVector() override;
+
+private:
+    const QMimeData* m_pMimeData;
+};
 
 class Qt5DragSource
     : public cppu::WeakComponentImplHelper<css::datatransfer::dnd::XDragSource,

vcl/inc/qt5/Qt5Frame.hxx

@@ -37,6 +37,7 @@ class QWidget;
 class Qt5MainWindow;
 class Qt5DragSource;
 class Qt5DropTarget;
+class QMimeData;
 class QPaintDevice;
 class QScreen;
 class QImage;
@@ -136,8 +137,8 @@ public:
     virtual void deregisterDragSource(Qt5DragSource const* pDragSource);
     virtual void registerDropTarget(Qt5DropTarget* pDropTarget);
     virtual void deregisterDropTarget(Qt5DropTarget const* pDropTarget);
-    void draggingStarted(const int x, const int y);
-    void dropping(const int x, const int y);
+    void draggingStarted(const int x, const int y, const QMimeData* pQMimeData);
+    void dropping(const int x, const int y, const QMimeData* pQMimeData);
 
     virtual void SetExtendedFrameStyle(SalExtStyle nExtStyle) override;
     virtual void Show(bool bVisible, bool bNoActivate = false) override;

vcl/qt5/Qt5DragAndDrop.cxx

@@ -14,6 +14,9 @@
 #include <cppuhelper/supportsservice.hxx>
 #include <sal/log.hxx>
 
+#include <QtCore/QMimeData>
+#include <QtCore/QUrl>
+
 #include <Qt5DragAndDrop.hxx>
 #include <Qt5Frame.hxx>
 #include <Qt5Widget.hxx>
@@ -22,6 +25,65 @@ using namespace com::sun::star;
 using namespace com::sun::star::uno;
 using namespace com::sun::star::lang;
 
+Qt5DnDTransferable::Qt5DnDTransferable(const QMimeData* pMimeData)
+    : m_pMimeData(pMimeData)
+{
+}
+
+css::uno::Any Qt5DnDTransferable::getTransferData(const css::datatransfer::DataFlavor& rFlavor)
+{
+    uno::Any aAny;
+    assert(m_pMimeData);
+
+    // FIXME: not sure if we should support more mimetypes here
+    // (how to carry out external DnD with anything else than [file] URL?)
+    if (m_pMimeData->hasUrls())
+    {
+        QList<QUrl> urlList = m_pMimeData->urls();
+
+        if (urlList.size() > 0)
+        {
+            //FIXME: multiple URLs, here we take only 1st one
+            QString url = urlList.at(0).path();
+            std::string aStr = url.toStdString();
+            Sequence<sal_Int8> aSeq(reinterpret_cast<const sal_Int8*>(aStr.c_str()), aStr.length());
+            aAny <<= aSeq;
+        }
+    }
+    return aAny;
+}
+
+std::vector<css::datatransfer::DataFlavor> Qt5DnDTransferable::getTransferDataFlavorsAsVector()
+{
+    std::vector<css::datatransfer::DataFlavor> aVector;
+    css::datatransfer::DataFlavor aFlavor;
+
+    if (m_pMimeData)
+    {
+        for (QString& rMimeType : m_pMimeData->formats())
+        {
+            // filter out non-MIME types such as TARGETS, MULTIPLE, TIMESTAMP
+            if (rMimeType.indexOf('/') == -1)
+                continue;
+
+            if (rMimeType.startsWith("text/plain"))
+            {
+                aFlavor.MimeType = "text/plain;charset=utf-16";
+                aFlavor.DataType = cppu::UnoType<OUString>::get();
+                aVector.push_back(aFlavor);
+            }
+            else
+            {
+                aFlavor.MimeType = toOUString(rMimeType);
+                aFlavor.DataType = cppu::UnoType<Sequence<sal_Int8>>::get();
+                aVector.push_back(aFlavor);
+            }
+        }
+    }
+
+    return aVector;
+}
+
 Qt5DragSource::~Qt5DragSource()
 {
     //if (m_pFrame)

vcl/qt5/Qt5Frame.cxx

@@ -1059,7 +1059,7 @@ void Qt5Frame::deregisterDropTarget(Qt5DropTarget const* pDropTarget)
     m_pDropTarget = nullptr;
 }
 
-void Qt5Frame::draggingStarted(const int x, const int y)
+void Qt5Frame::draggingStarted(const int x, const int y, const QMimeData* pQMimeData)
 {
     assert(m_pDropTarget);
 
@@ -1072,7 +1072,10 @@ void Qt5Frame::draggingStarted(const int x, const int y)
     aEvent.SourceActions = css::datatransfer::dnd::DNDConstants::ACTION_MOVE;
 
     css::uno::Reference<css::datatransfer::XTransferable> xTransferable;
-    xTransferable = Qt5DragSource::m_ActiveDragSource->GetTransferable();
+    if (pQMimeData)
+        xTransferable = new Qt5DnDTransferable(pQMimeData);
+    else
+        xTransferable = Qt5DragSource::m_ActiveDragSource->GetTransferable();
 
     if (!m_bInDrag && xTransferable.is())
     {
@@ -1087,7 +1090,7 @@ void Qt5Frame::draggingStarted(const int x, const int y)
         m_pDropTarget->fire_dragOver(aEvent);
 }
 
-void Qt5Frame::dropping(const int x, const int y)
+void Qt5Frame::dropping(const int x, const int y, const QMimeData* pQMimeData)
 {
     assert(m_pDropTarget);
 
@@ -1101,7 +1104,10 @@ void Qt5Frame::dropping(const int x, const int y)
     aEvent.SourceActions = css::datatransfer::dnd::DNDConstants::ACTION_MOVE;
 
     css::uno::Reference<css::datatransfer::XTransferable> xTransferable;
-    xTransferable = Qt5DragSource::m_ActiveDragSource->GetTransferable();
+    if (pQMimeData)
+        xTransferable = new Qt5DnDTransferable(pQMimeData);
+    else
+        xTransferable = Qt5DragSource::m_ActiveDragSource->GetTransferable();
     aEvent.Transferable = xTransferable;
 
     m_pDropTarget->fire_drop(aEvent);

vcl/qt5/Qt5Widget.cxx

@@ -204,14 +204,15 @@ void Qt5Widget::dragEnterEvent(QDragEnterEvent* event)
 {
     if (event->mimeData()->hasFormat(m_InternalMimeType))
         event->accept();
-    // else FIXME: external drag source
+    else
+        event->acceptProposedAction();
 }
 
 void Qt5Widget::dragMoveEvent(QDragMoveEvent* event)
 {
     QPoint point = event->pos();
 
-    m_pFrame->draggingStarted(point.x(), point.y());
+    m_pFrame->draggingStarted(point.x(), point.y(), event->mimeData());
     QWidget::dragMoveEvent(event);
 }
 
@@ -219,7 +220,7 @@ void Qt5Widget::dropEvent(QDropEvent* event)
 {
     QPoint point = event->pos();
 
-    m_pFrame->dropping(point.x(), point.y());
+    m_pFrame->dropping(point.x(), point.y(), event->mimeData());
     QWidget::dropEvent(event);
 }