Resolves: tdf#93054 gtk3: implement drag and drop

Change-Id: Ib644ea36b8a9e68e023e465ef159b9a4890e5d37

2 files changed, 73 insertions, 0 deletions

diff --git a/vcl/inc/unx/gtk/gtkframe.hxx b/vcl/inc/unx/gtk/gtkframe.hxx
index 584a2ab96922..6c7058a6c784 100644
--- a/vcl/inc/unx/gtk/gtkframe.hxx
+++ b/vcl/inc/unx/gtk/gtkframe.hxx
@@ -40,6 +40,9 @@
 #include "tools/link.hxx"
 
 #include <com/sun/star/awt/XTopWindow.hpp>
+#include <com/sun/star/datatransfer/DataFlavor.hpp>
+#include <com/sun/star/datatransfer/dnd/XDragSource.hpp>
+#include <com/sun/star/datatransfer/dnd/XDropTarget.hpp>
 
 #include <list>
 #include <vector>
@@ -55,6 +58,7 @@ typedef ::Window GdkNativeWindow;
 #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 GtkDragSource;
 class GtkDnDTransferable;
 #endif
 
@@ -209,6 +213,7 @@ class GtkSalFrame : public SalFrame
     long                            m_nHeightRequest;
     cairo_region_t*                 m_pRegion;
     GtkDropTarget*                  m_pDropTarget;
+    GtkDragSource*                  m_pDragSource;
     bool                            m_bInDrag;
     GtkDnDTransferable*             m_pFormatConversionRequest;
 #else
@@ -249,6 +254,13 @@ class GtkSalFrame : public SalFrame
     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);
+
+    static gboolean     signalDragFailed(GtkWidget *widget, GdkDragContext *context, GtkDragResult result, gpointer frame);
+    static void         signalDragDelete(GtkWidget *widget, GdkDragContext *context, gpointer frame);
+    static void         signalDragEnd(GtkWidget *widget, GdkDragContext *context, gpointer frame);
+    static void         signalDragDataGet(GtkWidget* widget, GdkDragContext* context, GtkSelectionData *data, guint info,
+                                          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);
@@ -385,11 +397,26 @@ public:
         m_pDropTarget = nullptr;
     }
 
+    void registerDragSource(GtkDragSource* pDragSource)
+    {
+        assert(!m_pDragSource);
+        m_pDragSource = pDragSource;
+    }
+
+    void deregisterDragSource(GtkDragSource* pDragSource)
+    {
+        assert(m_pDragSource == pDragSource); (void)pDragSource;
+        m_pDragSource = nullptr;
+    }
+
     void SetFormatConversionRequest(GtkDnDTransferable *pRequest)
     {
         m_pFormatConversionRequest = pRequest;
     }
 
+    void startDrag(gint nButton, gint nDragOriginX, gint nDragOriginY,
+                   GdkDragAction sourceActions, GtkTargetList* pTargetList);
+
 #endif
     virtual ~GtkSalFrame();
 
diff --git a/vcl/inc/unx/gtk/gtkinst.hxx b/vcl/inc/unx/gtk/gtkinst.hxx
index a649f620e223..93a041b7982a 100644
--- a/vcl/inc/unx/gtk/gtkinst.hxx
+++ b/vcl/inc/unx/gtk/gtkinst.hxx
@@ -24,6 +24,7 @@
 #include <unx/gensys.h>
 #include <headless/svpinst.hxx>
 #include <com/sun/star/datatransfer/DataFlavor.hpp>
+#include <com/sun/star/datatransfer/dnd/XDragSource.hpp>
 #include <com/sun/star/datatransfer/dnd/XDropTarget.hpp>
 #include <com/sun/star/lang/XInitialization.hpp>
 #include <com/sun/star/lang/XServiceInfo.hpp>
@@ -56,6 +57,8 @@ struct VclToGtkHelper
 {
     std::vector<css::datatransfer::DataFlavor> aInfoToFlavor;
     std::vector<GtkTargetEntry> FormatsToGtk(const css::uno::Sequence<css::datatransfer::DataFlavor> &rFormats);
+    void setSelectionData(const css::uno::Reference<css::datatransfer::XTransferable> &rTrans,
+                          GtkSelectionData *selection_data, guint info);
 private:
     GtkTargetEntry makeGtkTargetEntry(const css::datatransfer::DataFlavor& rFlavor);
 };
@@ -123,6 +126,48 @@ public:
     void fire_drop(const css::datatransfer::dnd::DropTargetDropEvent& dtde);
     void fire_dragExit(const css::datatransfer::dnd::DropTargetEvent& dte);
 };
+
+class GtkDragSource : public cppu::WeakComponentImplHelper<css::datatransfer::dnd::XDragSource,
+                                                           css::lang::XInitialization,
+                                                           css::lang::XServiceInfo>
+{
+    osl::Mutex m_aMutex;
+    GtkSalFrame* m_pFrame;
+    css::uno::Reference<css::datatransfer::dnd::XDragSourceListener> m_xListener;
+    css::uno::Reference<css::datatransfer::XTransferable> m_xTrans;
+    VclToGtkHelper m_aConversionHelper;
+public:
+    GtkDragSource() : WeakComponentImplHelper( m_aMutex ) {}
+    virtual ~GtkDragSource();
+
+    // XDragSource
+    virtual sal_Bool    SAL_CALL isDragImageSupported() throw(std::exception) override;
+    virtual sal_Int32   SAL_CALL getDefaultCursor(sal_Int8 dragAction) throw(std::exception) override;
+    virtual void        SAL_CALL startDrag(
+        const css::datatransfer::dnd::DragGestureEvent& trigger, sal_Int8 sourceActions, sal_Int32 cursor, sal_Int32 image,
+        const css::uno::Reference< css::datatransfer::XTransferable >& transferable,
+        const css::uno::Reference< css::datatransfer::dnd::XDragSourceListener >& listener) throw(std::exception) override;
+
+    // XInitialization
+    virtual void        SAL_CALL initialize(const css::uno::Sequence<css::uno::Any >& rArguments)
+        throw (css::uno::Exception, std::exception) override;
+            void        deinitialize();
+
+    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 dragFailed();
+    void dragDelete();
+    void dragEnd(GdkDragContext* context);
+    void dragDataGet(GtkSelectionData *data, guint info);
+};
+
 #endif
 
 class GtkSalTimer;
@@ -175,6 +220,7 @@ public:
 
 #if GTK_CHECK_VERSION(3,0,0)
     virtual css::uno::Reference< css::uno::XInterface > CreateClipboard( const css::uno::Sequence< css::uno::Any >& i_rArguments ) override;
+    virtual css::uno::Reference< css::uno::XInterface > CreateDragSource() override;
     virtual css::uno::Reference< css::uno::XInterface > CreateDropTarget() override;
 #endif