Related: tdf#93054 gtk3: implement enough dnd to be dragged into...

from another application, e.g. text from gedit or a standalone
image (view image) from firefox

Change-Id: I68b82217eb2513cedc096f5ff653fb7c75b48052

2 files changed, 111 insertions, 0 deletions

diff --git a/vcl/inc/unx/gtk/gtkframe.hxx b/vcl/inc/unx/gtk/gtkframe.hxx
index fbf84e053147..584a2ab96922 100644
--- a/vcl/inc/unx/gtk/gtkframe.hxx
+++ b/vcl/inc/unx/gtk/gtkframe.hxx
@@ -54,6 +54,8 @@ typedef ::Window GdkNativeWindow;
 #define GDK_WINDOW_XWINDOW(o) GDK_WINDOW_XID(o)
 #define gdk_set_sm_client_id(i) gdk_x11_set_sm_client_id(i)
 #define gdk_window_foreign_new_for_display(a,b) gdk_x11_window_foreign_new_for_display(a,b)
+class GtkDropTarget;
+class GtkDnDTransferable;
 #endif
 
 #if !(GLIB_MAJOR_VERSION > 2 || GLIB_MINOR_VERSION >= 26)
@@ -206,6 +208,9 @@ class GtkSalFrame : public SalFrame
     long                            m_nWidthRequest;
     long                            m_nHeightRequest;
     cairo_region_t*                 m_pRegion;
+    GtkDropTarget*                  m_pDropTarget;
+    bool                            m_bInDrag;
+    GtkDnDTransferable*             m_pFormatConversionRequest;
 #else
     GdkRegion*                      m_pRegion;
 #endif
@@ -237,6 +242,13 @@ class GtkSalFrame : public SalFrame
     static gboolean     signalTooltipQuery(GtkWidget*, gint x, gint y,
                                      gboolean keyboard_mode, GtkTooltip *tooltip,
                                      gpointer frame);
+    static gboolean     signalDragMotion(GtkWidget *widget, GdkDragContext *context, gint x, gint y,
+                                         guint time, gpointer frame);
+    static gboolean     signalDragDrop(GtkWidget* widget, GdkDragContext *context, gint x, gint y,
+                                       guint time, gpointer frame);
+    static void         signalDragDropReceived(GtkWidget *widget, GdkDragContext *context, gint x, gint y,
+                                               GtkSelectionData *data, guint ttype, guint time, gpointer frame);
+    static void         signalDragLeave(GtkWidget *widget, GdkDragContext *context, guint time, gpointer frame);
 #if GTK_CHECK_VERSION(3,14,0)
     static void         gestureSwipe(GtkGestureSwipe* gesture, gdouble velocity_x, gdouble velocity_y, gpointer frame);
     static void         gestureLongPress(GtkGestureLongPress* gesture, gpointer frame);
@@ -360,6 +372,24 @@ public:
     cairo_t* getCairoContext() const;
     void damaged(sal_Int32 nExtentsLeft, sal_Int32 nExtentsTop,
                  sal_Int32 nExtentsRight, sal_Int32 nExtentsBottom) const;
+
+    void registerDropTarget(GtkDropTarget* pDropTarget)
+    {
+        assert(!m_pDropTarget);
+        m_pDropTarget = pDropTarget;
+    }
+
+    void deregisterDropTarget(GtkDropTarget* pDropTarget)
+    {
+        assert(m_pDropTarget == pDropTarget); (void)pDropTarget;
+        m_pDropTarget = nullptr;
+    }
+
+    void SetFormatConversionRequest(GtkDnDTransferable *pRequest)
+    {
+        m_pFormatConversionRequest = pRequest;
+    }
+
 #endif
     virtual ~GtkSalFrame();
 
diff --git a/vcl/inc/unx/gtk/gtkinst.hxx b/vcl/inc/unx/gtk/gtkinst.hxx
index adcb142e21ac..a2f8f78943dc 100644
--- a/vcl/inc/unx/gtk/gtkinst.hxx
+++ b/vcl/inc/unx/gtk/gtkinst.hxx
@@ -23,6 +23,11 @@
 #include <unx/salinst.h>
 #include <unx/gensys.h>
 #include <headless/svpinst.hxx>
+#include <com/sun/star/datatransfer/DataFlavor.hpp>
+#include <com/sun/star/datatransfer/dnd/XDropTarget.hpp>
+#include <com/sun/star/lang/XInitialization.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <cppuhelper/compbase.hxx>
 #include <gtk/gtk.h>
 
 namespace vcl
@@ -44,6 +49,82 @@ public:
     void ThreadsLeave();
 };
 
+#if GTK_CHECK_VERSION(3,0,0)
+class GtkSalFrame;
+
+struct VclToGtkHelper
+{
+    std::vector<css::datatransfer::DataFlavor> aInfoToFlavor;
+    std::vector<GtkTargetEntry> FormatsToGtk(const css::uno::Sequence<css::datatransfer::DataFlavor> &rFormats);
+private:
+    GtkTargetEntry makeGtkTargetEntry(const css::datatransfer::DataFlavor& rFlavor);
+};
+
+class GtkTransferable : public cppu::WeakImplHelper<css::datatransfer::XTransferable>
+{
+protected:
+    std::map<OUString, GdkAtom> m_aMimeTypeToAtom;
+
+    std::vector<css::datatransfer::DataFlavor> getTransferDataFlavorsAsVector(GdkAtom *targets, gint n_targets);
+public:
+
+    virtual css::uno::Any SAL_CALL getTransferData(const css::datatransfer::DataFlavor& rFlavor)
+        throw(css::datatransfer::UnsupportedFlavorException,
+              css::io::IOException,
+              css::uno::RuntimeException, std::exception) override = 0;
+
+    virtual std::vector<css::datatransfer::DataFlavor> getTransferDataFlavorsAsVector() = 0;
+
+    virtual css::uno::Sequence<css::datatransfer::DataFlavor> SAL_CALL getTransferDataFlavors()
+        throw(css::uno::RuntimeException, std::exception) override;
+    virtual sal_Bool SAL_CALL isDataFlavorSupported(const css::datatransfer::DataFlavor& rFlavor)
+        throw(css::uno::RuntimeException, std::exception) override;
+};
+
+class GtkDropTarget : public cppu::WeakComponentImplHelper<css::datatransfer::dnd::XDropTarget,
+                                                           css::lang::XInitialization,
+                                                           css::lang::XServiceInfo>
+{
+    osl::Mutex m_aMutex;
+    GtkSalFrame* m_pFrame;
+    bool m_bActive;
+    sal_Int8 m_nDefaultActions;
+    std::list<css::uno::Reference<css::datatransfer::dnd::XDropTargetListener>> m_aListeners;
+public:
+    GtkDropTarget();
+    virtual ~GtkDropTarget();
+
+    // XInitialization
+    virtual void        SAL_CALL initialize(const css::uno::Sequence<css::uno::Any>& rArgs)
+                                    throw (css::uno::Exception, std::exception) override;
+            void        deinitialize();
+
+    // XDropTarget
+    virtual void        SAL_CALL addDropTargetListener(const css::uno::Reference<css::datatransfer::dnd::XDropTargetListener>&)
+                                    throw (std::exception) override;
+    virtual void        SAL_CALL removeDropTargetListener(const css::uno::Reference<css::datatransfer::dnd::XDropTargetListener>&)
+                                    throw (std::exception) override;
+    virtual sal_Bool    SAL_CALL isActive() throw(std::exception) override;
+    virtual void        SAL_CALL setActive(sal_Bool active) throw(std::exception) override;
+    virtual sal_Int8    SAL_CALL getDefaultActions() throw(std::exception) override;
+    virtual void        SAL_CALL setDefaultActions(sal_Int8 actions) throw(std::exception) override;
+
+    OUString SAL_CALL getImplementationName()
+                throw (css::uno::RuntimeException, std::exception) override;
+
+    sal_Bool SAL_CALL supportsService(OUString const & ServiceName)
+                throw (css::uno::RuntimeException, std::exception) override;
+
+    css::uno::Sequence<OUString> SAL_CALL getSupportedServiceNames()
+                throw (css::uno::RuntimeException, std::exception) override;
+
+    void fire_dragEnter(const css::datatransfer::dnd::DropTargetDragEnterEvent& dtdee);
+    void fire_dragOver(const css::datatransfer::dnd::DropTargetDragEvent& dtde);
+    void fire_drop(const css::datatransfer::dnd::DropTargetDropEvent& dtde);
+    void fire_dragExit(const css::datatransfer::dnd::DropTargetEvent& dte);
+};
+#endif
+
 class GtkSalTimer;
 #if GTK_CHECK_VERSION(3,0,0)
 class GtkInstance : public SvpSalInstance