1 files changed, 412 insertions, 0 deletions
diff --git a/vcl/source/window/dndeventdispatcher.cxx b/vcl/source/window/dndeventdispatcher.cxx
new file mode 100644
index 0000000000..c57841c1fd
--- /dev/null
+++ b/vcl/source/window/dndeventdispatcher.cxx
@@ -0,0 +1,412 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <dndeventdispatcher.hxx>
+#include <dndlistenercontainer.hxx>
+#include <sal/log.hxx>
+
+#include <osl/mutex.hxx>
+#include <vcl/svapp.hxx>
+#include <vcl/settings.hxx>
+
+using namespace ::cppu;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::datatransfer;
+using namespace ::com::sun::star::datatransfer::dnd;
+
+DNDEventDispatcher::DNDEventDispatcher( vcl::Window * pTopWindow ):
+    m_pTopWindow( pTopWindow ),
+    m_pCurrentWindow( nullptr )
+{
+}
+
+DNDEventDispatcher::~DNDEventDispatcher()
+{
+    designate_currentwindow(nullptr);
+}
+
+vcl::Window* DNDEventDispatcher::findTopLevelWindow(Point& location)
+{
+    SolarMutexGuard aSolarGuard;
+
+    // find the window that is toplevel for this coordinates
+    // because those coordinates come from outside, they must be mirrored if RTL layout is active
+    if( AllSettings::GetLayoutRTL() )
+        m_pTopWindow->ImplMirrorFramePos( location );
+    vcl::Window * pChildWindow = m_pTopWindow->ImplFindWindow( location );
+
+    if( nullptr == pChildWindow )
+        pChildWindow = m_pTopWindow;
+
+    while( pChildWindow->ImplGetClientWindow() )
+        pChildWindow = pChildWindow->ImplGetClientWindow();
+
+    if( pChildWindow->GetOutDev()->ImplIsAntiparallel() )
+    {
+        const OutputDevice *pChildWinOutDev = pChildWindow->GetOutDev();
+        pChildWinOutDev->ReMirror( location );
+    }
+
+    return pChildWindow;
+}
+
+IMPL_LINK(DNDEventDispatcher, WindowEventListener, VclWindowEvent&, rEvent, void)
+{
+    if (rEvent.GetId() == VclEventId::ObjectDying)
+    {
+        designate_currentwindow(nullptr);
+    }
+}
+
+void DNDEventDispatcher::designate_currentwindow(vcl::Window *pWindow)
+{
+    if (m_pCurrentWindow)
+        m_pCurrentWindow->RemoveEventListener(LINK(this, DNDEventDispatcher, WindowEventListener));
+    m_pCurrentWindow = pWindow;
+    if (m_pCurrentWindow)
+        m_pCurrentWindow->AddEventListener(LINK(this, DNDEventDispatcher, WindowEventListener));
+}
+
+void SAL_CALL DNDEventDispatcher::drop( const DropTargetDropEvent& dtde )
+{
+    std::scoped_lock aImplGuard( m_aMutex );
+
+    Point location( dtde.LocationX, dtde.LocationY );
+
+    vcl::Window* pChildWindow = findTopLevelWindow(location);
+
+    // handle the case that drop is in another vcl window than the last dragOver
+    if( pChildWindow != m_pCurrentWindow.get() )
+    {
+        // fire dragExit on listeners of previous window
+        fireDragExitEvent( m_pCurrentWindow );
+
+        fireDragEnterEvent( pChildWindow, static_cast < XDropTargetDragContext * > (this),
+            dtde.DropAction, location, dtde.SourceActions, m_aDataFlavorList );
+    }
+
+    // send drop event to the child window
+    sal_Int32 nListeners = fireDropEvent( pChildWindow, dtde.Context, dtde.DropAction,
+        location, dtde.SourceActions, dtde.Transferable );
+
+    // reject drop if no listeners found
+    if( nListeners == 0 ) {
+        SAL_WARN( "vcl", "rejecting drop due to missing listeners." );
+        dtde.Context->rejectDrop();
+    }
+
+    // this is a drop -> no further drag overs
+    designate_currentwindow(nullptr);
+    m_aDataFlavorList.realloc( 0 );
+}
+
+void SAL_CALL DNDEventDispatcher::dragEnter( const DropTargetDragEnterEvent& dtdee )
+{
+    std::scoped_lock aImplGuard( m_aMutex );
+    Point location( dtdee.LocationX, dtdee.LocationY );
+
+    vcl::Window * pChildWindow = findTopLevelWindow(location);
+
+    // assume pointer write operation to be atomic
+    designate_currentwindow(pChildWindow);
+    m_aDataFlavorList = dtdee.SupportedDataFlavors;
+
+    // fire dragEnter on listeners of current window
+    sal_Int32 nListeners = fireDragEnterEvent( pChildWindow, dtdee.Context, dtdee.DropAction, location,
+        dtdee.SourceActions, dtdee.SupportedDataFlavors );
+
+    // reject drag if no listener found
+    if( nListeners == 0 ) {
+        SAL_WARN( "vcl", "rejecting drag enter due to missing listeners." );
+        dtdee.Context->rejectDrag();
+    }
+
+}
+
+void SAL_CALL DNDEventDispatcher::dragExit( const DropTargetEvent& /*dte*/ )
+{
+    std::scoped_lock aImplGuard( m_aMutex );
+
+    fireDragExitEvent( m_pCurrentWindow );
+
+    // reset member values
+    designate_currentwindow(nullptr);
+    m_aDataFlavorList.realloc( 0 );
+}
+
+void SAL_CALL DNDEventDispatcher::dragOver( const DropTargetDragEvent& dtde )
+{
+    std::scoped_lock aImplGuard( m_aMutex );
+
+    Point location( dtde.LocationX, dtde.LocationY );
+    sal_Int32 nListeners;
+
+    vcl::Window * pChildWindow = findTopLevelWindow(location);
+
+    if( pChildWindow != m_pCurrentWindow.get() )
+    {
+        // fire dragExit on listeners of previous window
+        fireDragExitEvent( m_pCurrentWindow );
+
+        // remember new window
+        designate_currentwindow(pChildWindow);
+
+        // fire dragEnter on listeners of current window
+        nListeners = fireDragEnterEvent( pChildWindow, dtde.Context, dtde.DropAction, location,
+            dtde.SourceActions, m_aDataFlavorList );
+    }
+    else
+    {
+        // fire dragOver on listeners of current window
+        nListeners = fireDragOverEvent( pChildWindow, dtde.Context, dtde.DropAction, location,
+            dtde.SourceActions );
+    }
+
+    // reject drag if no listener found
+    if( nListeners == 0 )
+    {
+        SAL_WARN( "vcl", "rejecting drag over due to missing listeners." );
+        dtde.Context->rejectDrag();
+    }
+}
+
+void SAL_CALL DNDEventDispatcher::dropActionChanged( const DropTargetDragEvent& dtde )
+{
+    std::scoped_lock aImplGuard( m_aMutex );
+
+    Point location( dtde.LocationX, dtde.LocationY );
+    sal_Int32 nListeners;
+
+    vcl::Window* pChildWindow = findTopLevelWindow(location);
+
+    if( pChildWindow != m_pCurrentWindow.get() )
+    {
+        // fire dragExit on listeners of previous window
+        fireDragExitEvent( m_pCurrentWindow );
+
+        // remember new window
+        designate_currentwindow(pChildWindow);
+
+        // fire dragEnter on listeners of current window
+        nListeners = fireDragEnterEvent( pChildWindow, dtde.Context, dtde.DropAction, location,
+            dtde.SourceActions, m_aDataFlavorList );
+    }
+    else
+    {
+        // fire dropActionChanged on listeners of current window
+        nListeners = fireDropActionChangedEvent( pChildWindow, dtde.Context, dtde.DropAction, location,
+            dtde.SourceActions );
+    }
+
+    // reject drag if no listener found
+    if( nListeners == 0 )
+    {
+        SAL_WARN( "vcl", "rejecting dropActionChanged due to missing listeners." );
+        dtde.Context->rejectDrag();
+    }
+}
+
+void SAL_CALL DNDEventDispatcher::dragGestureRecognized( const DragGestureEvent& dge )
+{
+    std::scoped_lock aImplGuard( m_aMutex );
+
+    Point origin( dge.DragOriginX, dge.DragOriginY );
+
+    vcl::Window* pChildWindow = findTopLevelWindow(origin);
+
+    fireDragGestureEvent( pChildWindow, dge.DragSource, dge.Event, origin, dge.DragAction );
+}
+
+void SAL_CALL DNDEventDispatcher::disposing( const EventObject& )
+{
+}
+
+void SAL_CALL DNDEventDispatcher::acceptDrag( sal_Int8 /*dropAction*/ )
+{
+}
+
+void SAL_CALL DNDEventDispatcher::rejectDrag()
+{
+}
+
+sal_Int32 DNDEventDispatcher::fireDragEnterEvent( vcl::Window *pWindow,
+    const Reference< XDropTargetDragContext >& xContext, const sal_Int8 nDropAction,
+    const Point& rLocation, const sal_Int8 nSourceActions, const Sequence< DataFlavor >& aFlavorList
+)
+{
+    sal_Int32 n = 0;
+
+    if( pWindow && pWindow->IsInputEnabled() && ! pWindow->IsInModalMode() )
+    {
+        SolarMutexClearableGuard aSolarGuard;
+
+        // query DropTarget from window
+        Reference< XDropTarget > xDropTarget = pWindow->GetDropTarget();
+
+        if( xDropTarget.is() )
+        {
+            // retrieve relative mouse position
+            Point relLoc = pWindow->ScreenToOutputPixel( rLocation );
+            aSolarGuard.clear();
+
+            n = static_cast < DNDListenerContainer * > ( xDropTarget.get() )->fireDragEnterEvent(
+                xContext, nDropAction, relLoc.X(), relLoc.Y(), nSourceActions, aFlavorList );
+        }
+    }
+
+    return n;
+}
+
+sal_Int32 DNDEventDispatcher::fireDragOverEvent( vcl::Window *pWindow,
+    const Reference< XDropTargetDragContext >& xContext, const sal_Int8 nDropAction,
+    const Point& rLocation, const sal_Int8 nSourceActions
+)
+{
+    sal_Int32 n = 0;
+
+    if( pWindow && pWindow->IsInputEnabled() && ! pWindow->IsInModalMode() )
+    {
+        SolarMutexClearableGuard aSolarGuard;
+
+        // query DropTarget from window
+        Reference< XDropTarget > xDropTarget = pWindow->GetDropTarget();
+
+        if( xDropTarget.is() )
+        {
+            // retrieve relative mouse position
+            Point relLoc = pWindow->ScreenToOutputPixel( rLocation );
+            aSolarGuard.clear();
+
+            n = static_cast < DNDListenerContainer * > ( xDropTarget.get() )->fireDragOverEvent(
+                xContext, nDropAction, relLoc.X(), relLoc.Y(), nSourceActions );
+        }
+    }
+
+    return n;
+}
+
+sal_Int32 DNDEventDispatcher::fireDragExitEvent( vcl::Window *pWindow )
+{
+    sal_Int32 n = 0;
+
+    if( pWindow && pWindow->IsInputEnabled() && ! pWindow->IsInModalMode() )
+    {
+        SolarMutexClearableGuard aGuard;
+
+        // query DropTarget from window
+        Reference< XDropTarget > xDropTarget = pWindow->GetDropTarget();
+
+        aGuard.clear();
+
+        if( xDropTarget.is() )
+            n = static_cast < DNDListenerContainer * > ( xDropTarget.get() )->fireDragExitEvent();
+    }
+
+    return n;
+}
+
+sal_Int32 DNDEventDispatcher::fireDropActionChangedEvent( vcl::Window *pWindow,
+    const Reference< XDropTargetDragContext >& xContext, const sal_Int8 nDropAction,
+    const Point& rLocation, const sal_Int8 nSourceActions
+)
+{
+    sal_Int32 n = 0;
+
+    if( pWindow && pWindow->IsInputEnabled() && ! pWindow->IsInModalMode() )
+    {
+        SolarMutexClearableGuard aGuard;
+
+        // query DropTarget from window
+        Reference< XDropTarget > xDropTarget = pWindow->GetDropTarget();
+
+        if( xDropTarget.is() )
+        {
+            // retrieve relative mouse position
+            Point relLoc = pWindow->ScreenToOutputPixel( rLocation );
+            aGuard.clear();
+
+            n = static_cast < DNDListenerContainer * > ( xDropTarget.get() )->fireDropActionChangedEvent(
+                xContext, nDropAction, relLoc.X(), relLoc.Y(), nSourceActions );
+        }
+    }
+
+    return n;
+}
+
+sal_Int32 DNDEventDispatcher::fireDropEvent( vcl::Window *pWindow,
+    const Reference< XDropTargetDropContext >& xContext, const sal_Int8 nDropAction, const Point& rLocation,
+    const sal_Int8 nSourceActions, const Reference< XTransferable >& xTransferable
+)
+{
+    sal_Int32 n = 0;
+
+    if( pWindow && pWindow->IsInputEnabled() && ! pWindow->IsInModalMode() )
+    {
+        SolarMutexClearableGuard aGuard;
+
+        // query DropTarget from window
+        Reference< XDropTarget > xDropTarget = pWindow->GetDropTarget();
+
+        // window may be destroyed in drop event handler
+        VclPtr<vcl::Window> xPreventDelete = pWindow;
+
+        if( xDropTarget.is() )
+        {
+            // retrieve relative mouse position
+            Point relLoc = pWindow->ScreenToOutputPixel( rLocation );
+            aGuard.clear();
+
+            n = static_cast < DNDListenerContainer * > ( xDropTarget.get() )->fireDropEvent(
+                xContext, nDropAction, relLoc.X(), relLoc.Y(), nSourceActions, xTransferable );
+        }
+    }
+
+    return n;
+}
+
+sal_Int32 DNDEventDispatcher::fireDragGestureEvent( vcl::Window *pWindow,
+    const Reference< XDragSource >& xSource, const Any& event,
+    const Point& rOrigin, const sal_Int8 nDragAction
+)
+{
+    sal_Int32 n = 0;
+
+    if( pWindow && pWindow->IsInputEnabled() && ! pWindow->IsInModalMode() )
+    {
+        SolarMutexClearableGuard aGuard;
+
+        // query DropTarget from window
+        Reference< XDragGestureRecognizer > xDragGestureRecognizer = pWindow->GetDragGestureRecognizer();
+
+        if( xDragGestureRecognizer.is() )
+        {
+            // retrieve relative mouse position
+            Point relLoc = pWindow->ScreenToOutputPixel( rOrigin );
+            aGuard.clear();
+
+            n = static_cast < DNDListenerContainer * > ( xDragGestureRecognizer.get() )->fireDragGestureEvent(
+                nDragAction, relLoc.X(), relLoc.Y(), xSource, event );
+        }
+    }
+
+    return n;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */