Fixes #10437 (wxDataObjectComposite::Add may add objects having data formats that...

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@58549 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

diff --git a/include/wx/dataobj.h b/include/wx/dataobj.h
index 1dc04bef5512771e2098c7bfd8a149761e1cb6d7..ec7b0d76a4bcf2f10a37b6af40b281408215b1f2 100644 (file)
--- a/include/wx/dataobj.h
+++ b/include/wx/dataobj.h
@@ -297,7 +297,7 @@ public:
 
 protected:
     // returns the pointer to the object which supports this format or NULL
-    wxDataObjectSimple *GetObject(const wxDataFormat& format) const;
+    wxDataObjectSimple *GetObject(const wxDataFormat& format, wxDataObjectBase::Direction dir=Get) const;
 
 private:
     // the list of all (simple) data objects whose formats we support

diff --git a/src/common/dobjcmn.cpp b/src/common/dobjcmn.cpp
index 4929160986a53a6d05e3d01ab98f532cab16e4d9..20d6b2999c29e7630b98f07667439eb80bedc6c0 100644 (file)
--- a/src/common/dobjcmn.cpp
+++ b/src/common/dobjcmn.cpp
@@ -94,29 +94,48 @@ wxDataObjectComposite::~wxDataObjectComposite()
 }
 
 wxDataObjectSimple *
-wxDataObjectComposite::GetObject(const wxDataFormat& format) const
+wxDataObjectComposite::GetObject(const wxDataFormat& format, wxDataObjectBase::Direction dir) const
 {
     wxSimpleDataObjectList::compatibility_iterator node = m_dataObjects.GetFirst();
+
     while ( node )
     {
         wxDataObjectSimple *dataObj = node->GetData();
 
-        if ( dataObj->GetFormat() == format )
-        {
-            return dataObj;
-        }
-
+        if (dataObj->IsSupported(format,dir))
+          return dataObj;
         node = node->GetNext();
     }
-
     return NULL;
 }
 
 void wxDataObjectComposite::Add(wxDataObjectSimple *dataObject, bool preferred)
 {
+   // check if the data format of the passed object already exists in the composite data object, if this is the case
+   // do not add the data object and display a message in debug mode (otherwise this method fails silently):
+   // start checking if the data format exists for the 'GET' direction:
+    size_t indexFormats;
+    size_t noOfFormats;
+    wxDataFormat* formats;
+    
+    noOfFormats = dataObject->GetFormatCount(wxDataObjectBase::Get);
+    formats = new wxDataFormat[noOfFormats];
+    for (indexFormats=0; indexFormats<noOfFormats; ++indexFormats)
+      wxCHECK_RET(this->GetObject(formats[indexFormats],wxDataObjectBase::Get) == NULL,
+                  _("The data format for the GET-direction of the to be added data object already exists"));
+    delete[] formats;
+   // do the same with the 'SET' direction:
+    noOfFormats = dataObject->GetFormatCount(wxDataObjectBase::Set);
+    
+    formats = new wxDataFormat[noOfFormats];
+    for (indexFormats=0; indexFormats<noOfFormats; ++indexFormats)
+      wxCHECK_RET(this->GetObject(formats[indexFormats],wxDataObjectBase::Set) == NULL,
+                  _("The data format for the SET-direction of the to be added data object already exists"));
+    delete[] formats;
+
+   // if we reach this location the data object can simply be appended:
     if ( preferred )
         m_preferred = m_dataObjects.GetCount();
-
     m_dataObjects.Append( dataObject );
 }