Implement initial try of wxDropTarget.

The drop target needs to use an event filter to capture drag-and-drop events from the window.

src/qt/window.cpp

@@ -31,12 +31,12 @@
 #endif // WX_PRECOMP
 
 #include "wx/window.h"
+#include "wx/dnd.h"
 #include "wx/tooltip.h"
 #include "wx/qt/private/utils.h"
 #include "wx/qt/private/converter.h"
 #include "wx/qt/private/winevent.h"
 
-
 #define VERT_SCROLLBAR_POSITION 0, 1
 #define HORZ_SCROLLBAR_POSITION 1, 0
 
@@ -193,9 +193,6 @@ static const char WINDOW_POINTER_PROPERTY_NAME[] = "wxWindowPointer";
     return const_cast< wxWindowQt * >( ( variant.value< const wxWindow * >() ));
 }
 
-
-
-
 static wxWindowQt *s_capturedWindow = NULL;
 
 /* static */ wxWindowQt *wxWindowBase::DoFindFocus()
@@ -225,6 +222,8 @@ void wxWindowQt::Init()
 #endif
     m_qtWindow = NULL;
     m_qtContainer = NULL;
+
+    m_dropTarget = NULL;
 }
 
 wxWindowQt::wxWindowQt()
@@ -688,9 +687,9 @@ void wxWindowQt::ScrollWindow( int dx, int dy, const wxRect *rect )
 
 
 #if wxUSE_DRAG_AND_DROP
-void wxWindowQt::SetDropTarget( wxDropTarget * WXUNUSED( dropTarget ) )
+void wxWindowQt::SetDropTarget( wxDropTarget *dropTarget )
 {
-    wxMISSING_IMPLEMENTATION( __FUNCTION__ );
+    dnd_event_adapter.SetDropTarget(dropTarget, m_qtWindow);
 }
 #endif
 
@@ -1543,3 +1542,60 @@ QPainter *wxWindowQt::QtGetPainter()
 {
     return m_qtPainter;
 }
+
+//##############################################################################
+// DnDEventAdapter
+//##############################################################################
+
+wxWindow::DnDEventAdapter::DnDEventAdapter() : m_dropTarget(NULL)
+{
+}
+
+bool wxWindow::DnDEventAdapter::eventFilter(QObject* watched, QEvent* event)
+{
+    if ( m_dropTarget != NULL )
+    {
+        switch ( event->type() )
+        {
+            case QEvent::Drop:
+                m_dropTarget->OnQtDrop(event);
+                return true;
+
+            case QEvent::DragEnter:
+                m_dropTarget->OnQtEnter(event);
+                return true;
+
+            case QEvent::DragMove:
+                m_dropTarget->OnQtMove(event);
+                return true;
+
+            case QEvent::DragLeave:
+                m_dropTarget->OnQtLeave(event);
+                return true;
+
+            default:
+                break;
+        }
+    }
+
+    return QObject::eventFilter(watched, event);
+}
+
+void wxWindow::DnDEventAdapter::SetDropTarget(wxDropTarget* dropTarget, QWidget* window)
+{
+    if ( m_dropTarget == dropTarget )
+        return;
+
+    m_dropTarget = dropTarget;
+
+    if ( m_dropTarget == NULL )
+    {
+        window->removeEventFilter(this);
+        window->setAcceptDrops(false);
+    }
+    else
+    {
+        window->installEventFilter(this);
+        window->setAcceptDrops(true);
+    }
+}