+Boolean wxMacDataViewDataBrowserListViewControl::DataBrowserAcceptDragProc(DragReference dragRef, DataBrowserItemID itemID)
+{
+ UInt16 noOfDraggedItems;
+
+ wxDataViewCtrl* dataViewCtrlPtr;
+
+
+ dataViewCtrlPtr = dynamic_cast<wxDataViewCtrl*>(this->GetWXPeer());
+ wxCHECK_MSG(dataViewCtrlPtr != NULL, false,_("Pointer to data view control not set correctly."));
+ wxCHECK_MSG(dataViewCtrlPtr->GetModel() != NULL,false,_("Pointer to model not set correctly."));
+
+ // send a drag possible event for each available item and proceed with it unless the event is vetoed:
+ ::CountDragItems(dragRef,&noOfDraggedItems);
+ for (UInt16 indexDraggedItem=1; indexDraggedItem<=noOfDraggedItems; ++indexDraggedItem)
+ {
+ // collect native information:
+ ItemReference itemRef;
+ wxDataObjectComposite* dataObjects;
+ wxMemoryBuffer buffer;
+
+ ::GetDragItemReferenceNumber(dragRef,indexDraggedItem,&itemRef); // the index begins with 1!
+ dataObjects = this->GetDnDDataObjects(dragRef,itemRef);
+ // create wxWidget's event:
+ wxDataViewEvent dataViewEvent(wxEVT_COMMAND_DATAVIEW_ITEM_DROP_POSSIBLE,dataViewCtrlPtr->GetId());
+
+ dataViewEvent.SetEventObject(dataViewCtrlPtr);
+ dataViewEvent.SetItem(reinterpret_cast<void*>(itemID)); // this is the item that receives the event
+ // (can be an invalid item ID, this is especially useful if the dataview does not contain any items)
+ dataViewEvent.SetModel(dataViewCtrlPtr->GetModel());
+ dataViewEvent.SetDataObject(dataObjects);
+ dataViewEvent.SetDataFormat(this->GetDnDDataFormat(dataObjects));
+ if (dataViewEvent.GetDataFormat().GetType() != wxDF_INVALID)
+ {
+ dataViewEvent.SetDataSize(dataObjects->GetDataSize(dataViewEvent.GetDataFormat().GetType()));
+ dataObjects->GetDataHere(dataViewEvent.GetDataFormat().GetType(),buffer.GetWriteBuf(dataViewEvent.GetDataSize()));
+ buffer.UngetWriteBuf(dataViewEvent.GetDataSize());
+ dataViewEvent.SetDataBuffer(buffer.GetData());
+ }
+
+ // send event:
+ if (!(dataViewCtrlPtr->HandleWindowEvent(dataViewEvent) && dataViewEvent.IsAllowed()))
+ return false;
+ }
+ return true;
+} /* wxMacDataViewDataBrowserListViewControl::DataBrowserAcceptDragProc(DragReference, DataBrowserItemID) */
+
+Boolean wxMacDataViewDataBrowserListViewControl::DataBrowserAddDragItemProc(DragReference dragRef, DataBrowserItemID itemID, ItemReference* itemRef)
+{
+ wxDataViewCtrl* dataViewCtrlPtr;
+
+ wxDataViewItem dataViewItem;
+
+
+ dataViewCtrlPtr = dynamic_cast<wxDataViewCtrl*>(this->GetWXPeer());
+ wxCHECK_MSG(dataViewCtrlPtr != NULL, false,_("Pointer to data view control not set correctly."));
+ wxCHECK_MSG(dataViewCtrlPtr->GetModel() != NULL,false,_("Pointer to model not set correctly."));
+ dataViewItem = reinterpret_cast<void*>(itemID);
+ wxCHECK_MSG(dataViewItem.IsOk(),false,_("Invalid data view item"));
+
+ // send a begin drag event and proceed with dragging unless the event is vetoed:
+ wxDataViewEvent dataViewEvent(wxEVT_COMMAND_DATAVIEW_ITEM_BEGIN_DRAG,dataViewCtrlPtr->GetId());
+
+ dataViewEvent.SetEventObject(dataViewCtrlPtr);
+ dataViewEvent.SetItem(dataViewItem);
+ dataViewEvent.SetModel(dataViewCtrlPtr->GetModel());
+ // the dataview event object is also initialized with a default set of data; as it is a set of data and the user should be able to easily complete
+ // the object a wxDataObjectComposite object is used;
+ // currently, the composite object only contains a TAB concatenated string of all data:
+ wxDataObjectComposite* dataObject(new wxDataObjectComposite());
+ wxString dataString; // contains the TAB concatenated data
+
+ for (size_t i=0; i<dataViewCtrlPtr->GetColumnCount(); i++)
+ {
+ // variable definition:
+ wxVariant dataValue;
+
+ dataViewCtrlPtr->GetModel()->GetValue(dataValue,dataViewItem,dataViewCtrlPtr->GetColumn(i)->GetModelColumn());
+ if (i > 0)
+ dataString << wxT('\t');
+ dataString << dataValue.MakeString();
+ }
+ dataObject->Add(new wxTextDataObject(dataString));
+ dataViewEvent.SetDataObject(dataObject);
+ // check if event has not been vetoed:
+ if (dataViewCtrlPtr->HandleWindowEvent(dataViewEvent) && dataViewEvent.IsAllowed())
+ {
+ // for the internal drag & drop functions create two flavors:
+ // - the data browser's item id;
+ // - the data contained the dataview event object (if available).
+ // Definition: a flavor is the type dependent representation of identical data.
+ // Example: a number can be represented by its value and by its value converted to a string. In this case the flavor
+ // of the number's internal representation is typeSInt32 while its string representation has got the flavor 'TEXT'.
+ // Item id is one of the flavors:
+ wxCHECK_MSG(::AddDragItemFlavor(dragRef,*itemRef,typeUInt32,&itemID,sizeof(itemID),0) == noErr,false,_("Unable to handle native drag&drop data"));
+ // if the dataview event object contains data it is used for additional flavors; all natively known flavors are supported:
+ if (dataViewEvent.GetDataObject() != NULL)
+ {
+ // constant definition for abbreviational purposes:
+ size_t const noOfFormats = dataViewEvent.GetDataObject()->GetFormatCount();
+
+ if (noOfFormats > 0)
+ {
+ // variable definition:
+ wxDataFormat* dataFormats;
+
+ dataFormats = new wxDataFormat[noOfFormats];
+ dataViewEvent.GetDataObject()->GetAllFormats(dataFormats,wxDataObject::Get);
+ for (size_t i=0; i<noOfFormats; ++i)
+ switch (dataFormats[i].GetType())
+ {
+ case wxDF_INVALID:
+ wxFAIL_MSG(_("Data object has invalid data format"));
+ break;
+ case wxDF_TEXT:
+ {
+ // constant definition for abbreviational purposes:
+ size_t const dataSize = dataViewEvent.GetDataObject()->GetDataSize(wxDF_TEXT);
+ // variable definition and initialization:
+ wxMemoryBuffer dataObject(dataSize);
+
+ dataViewEvent.GetDataObject()->GetDataHere(wxDF_TEXT,dataObject.GetWriteBuf(dataSize));
+ dataObject.UngetWriteBuf(dataSize);
+ if (::AddDragItemFlavor(dragRef,*itemRef,'TEXT',dataObject.GetData(),dataSize,0) != noErr)
+ wxFAIL_MSG(_("Adding flavor TEXT failed"));
+ } /* block */
+ break;
+ case wxDF_UNICODETEXT:
+ {
+ // constant definition for abbreviational purposes:
+ size_t const dataSize = dataViewEvent.GetDataObject()->GetDataSize(wxDF_TEXT);
+ // as there is no direct access to the data copy it to a memory buffer:
+ wxMemoryBuffer dataObject(dataSize);
+
+ dataViewEvent.GetDataObject()->GetDataHere(wxDF_TEXT,dataObject.GetWriteBuf(dataSize));
+ dataObject.UngetWriteBuf(dataSize);
+ // if the data is stored in unicode format the internal representation is utf-8 (not mentioned in the documentation but in the source code);
+ // DnD uses fixed utf-16 representation -> use the OSX functions for a conversion:
+ CFDataRef osxData (::CFDataCreateWithBytesNoCopy(kCFAllocatorDefault,reinterpret_cast<UInt8*>(dataObject.GetData()),dataSize,kCFAllocatorNull));
+ CFStringRef osxString(::CFStringCreateFromExternalRepresentation(kCFAllocatorDefault,osxData,kCFStringEncodingUTF8));
+
+ // the osxString contains now the data and therefore the previously occupied memory can be released and re-used:
+ ::CFRelease(osxData);
+ osxData = ::CFStringCreateExternalRepresentation(kCFAllocatorDefault,osxString,kCFStringEncodingUTF16,32);
+ if (::AddDragItemFlavor(dragRef,*itemRef,'utxt',::CFDataGetBytePtr(osxData),::CFDataGetLength(osxData),0) != noErr)
+ wxFAIL_MSG(_("Adding flavor utxt failed"));
+ // clean up:
+ ::CFRelease(osxData);
+ ::CFRelease(osxString);
+ } /* block */
+ break;
+ case wxDF_BITMAP:
+ case wxDF_METAFILE:
+ case wxDF_SYLK:
+ case wxDF_DIF:
+ case wxDF_TIFF:
+ case wxDF_OEMTEXT:
+ case wxDF_DIB:
+ case wxDF_PALETTE:
+ case wxDF_PENDATA:
+ case wxDF_RIFF:
+ case wxDF_WAVE:
+ case wxDF_ENHMETAFILE:
+ case wxDF_FILENAME:
+ case wxDF_LOCALE:
+ case wxDF_PRIVATE:
+ case wxDF_HTML:
+ break; // not (yet) supported data formats
+ default:
+ wxFAIL_MSG(_("Unknown data format"));
+ }
+ delete[] dataFormats;
+ }
+ }
+ return true;
+ }
+ else
+ return false;
+} /* wxMacDataViewDataBrowserListViewControl::DataBrowserAddDragItemProc(DragReference, DataBrowserItemID, ItemReference*) */
+
+Boolean wxMacDataViewDataBrowserListViewControl::DataBrowserReceiveDragProc(DragReference dragRef, DataBrowserItemID itemID)
+{
+ UInt16 noOfDraggedItems;
+
+ wxDataViewCtrl* dataViewCtrlPtr;
+
+
+ dataViewCtrlPtr = dynamic_cast<wxDataViewCtrl*>(this->GetWXPeer());
+ wxCHECK_MSG(dataViewCtrlPtr != NULL, false,_("Pointer to data view control not set correctly."));
+ wxCHECK_MSG(dataViewCtrlPtr->GetModel() != NULL,false,_("Pointer to model not set correctly."));
+
+ // send a drag possible event for each available and item und proceed with it unless the event is vetoed:
+ ::CountDragItems(dragRef,&noOfDraggedItems);
+ for (UInt16 indexDraggedItem=1; indexDraggedItem<=noOfDraggedItems; ++indexDraggedItem)
+ {
+ // collect native information:
+ ItemReference itemRef;
+ wxDataObjectComposite* dataObjects;
+ wxMemoryBuffer buffer;
+
+ ::GetDragItemReferenceNumber(dragRef,indexDraggedItem,&itemRef); // the index begins with 1!
+ dataObjects = this->GetDnDDataObjects(dragRef,itemRef);
+ // create wxWidget's event:
+ wxDataViewEvent dataViewEvent(wxEVT_COMMAND_DATAVIEW_ITEM_DROP,dataViewCtrlPtr->GetId());
+
+ dataViewEvent.SetEventObject(dataViewCtrlPtr);
+ dataViewEvent.SetItem(reinterpret_cast<void*>(itemID)); // this is the item that receives the event
+ // (can be an invalid item ID, this is especially useful if the dataview does not contain any items)
+ dataViewEvent.SetModel(dataViewCtrlPtr->GetModel());
+ dataViewEvent.SetDataObject(dataObjects);
+ dataViewEvent.SetDataFormat(this->GetDnDDataFormat(dataObjects));
+ if (dataViewEvent.GetDataFormat().GetType() != wxDF_INVALID)
+ {
+ dataViewEvent.SetDataSize(dataObjects->GetDataSize(dataViewEvent.GetDataFormat().GetType()));
+ dataObjects->GetDataHere(dataViewEvent.GetDataFormat().GetType(),buffer.GetWriteBuf(dataViewEvent.GetDataSize()));
+ buffer.UngetWriteBuf(dataViewEvent.GetDataSize());
+ dataViewEvent.SetDataBuffer(buffer.GetData());
+ }
+
+ // send event:
+ if (!(dataViewCtrlPtr->HandleWindowEvent(dataViewEvent) && dataViewEvent.IsAllowed()))
+ return false;
+ }
+ return true;
+} /* wxMacDataViewDataBrowserListViewControl::DataBrowserReceiveDragProc(DragReference, DataBrowserItemID) */
+
+//
+// drag & drop helper methods
+//
+wxDataFormat wxMacDataViewDataBrowserListViewControl::GetDnDDataFormat(wxDataObjectComposite* dataObjects)
+{
+ wxDataFormat resultFormat;
+
+
+ if (dataObjects != NULL)
+ {
+ bool compatible(true);
+
+ size_t const noOfFormats = dataObjects->GetFormatCount();
+ size_t indexFormat;
+
+ wxDataFormat* formats;
+
+ // get all formats and check afterwards if the formats are compatible; if they are compatible the preferred format is returned otherwise
+ // wxDF_INVALID is returned;
+ // currently compatible types (ordered by priority are):
+ // - wxDF_UNICODETEXT - wxDF_TEXT
+ formats = new wxDataFormat[noOfFormats];
+ dataObjects->GetAllFormats(formats);
+ indexFormat = 0;
+ while ((indexFormat < noOfFormats) && compatible)
+ {
+ switch (resultFormat.GetType())
+ {
+ case wxDF_INVALID:
+ resultFormat.SetType(formats[indexFormat].GetType()); // first format (should only be reached if indexFormat == 0
+ break;
+ case wxDF_TEXT:
+ if (formats[indexFormat].GetType() == wxDF_UNICODETEXT)
+ resultFormat.SetType(wxDF_UNICODETEXT);
+ else // incompatible
+ {
+ resultFormat.SetType(wxDF_INVALID);
+ compatible = false;
+ }
+ break;
+ case wxDF_UNICODETEXT:
+ if (formats[indexFormat].GetType() != wxDF_TEXT)
+ {
+ resultFormat.SetType(wxDF_INVALID);
+ compatible = false;
+ }
+ break;
+ default:
+ resultFormat.SetType(wxDF_INVALID); // not (yet) supported format
+ compatible = false;
+ }
+ ++indexFormat;
+ } /* while */
+ // clean up:
+ delete[] formats;
+ }
+ return resultFormat;
+} /* wxMacDataViewDataBrowserListViewControl::GetDnDDataFormat(wxDataObjectComposite*) */
+
+wxDataObjectComposite* wxMacDataViewDataBrowserListViewControl::GetDnDDataObjects(DragReference dragRef, ItemReference itemRef) const
+{
+ UInt16 noOfFlavors;
+
+ wxDataObjectComposite* dataObject;
+
+
+ ::CountDragItemFlavors(dragRef,itemRef,&noOfFlavors);
+ if (noOfFlavors > 0)
+ {
+ // as the native drag data can be separated into TEXT and UTXT a pointer to a wxTextDataObject is used to track the existence of 'TEXT' and 'utxt' flavors:
+ wxTextDataObject* textDataObject(NULL);
+
+ dataObject = new wxDataObjectComposite();
+ for (UInt16 indexFlavor=1; indexFlavor<=noOfFlavors; ++indexFlavor)
+ {
+ // variable definition:
+ FlavorType flavorDataObject;
+
+ if (::GetFlavorType(dragRef,itemRef,indexFlavor,&flavorDataObject) == noErr) // GetFlavorType uses a 1 based index!
+ switch (flavorDataObject)
+ {
+ case 'TEXT':
+ if (textDataObject == NULL) // otherwise a 'utxt' flavor has already been found that gets priority compared to the 'TEXT' flavor
+ {
+ // variable definitions:
+ Size nativeDataSize;
+ wxMemoryBuffer nativeData;
+
+ if ((::GetFlavorDataSize(dragRef,itemRef,'TEXT',&nativeDataSize) == noErr) &&
+ (::GetFlavorData(dragRef,itemRef,'TEXT',nativeData.GetWriteBuf(nativeDataSize),&nativeDataSize,0) == noErr))
+ {
+ nativeData.UngetWriteBuf(nativeDataSize);
+ textDataObject = new wxTextDataObject();
+ if (textDataObject->SetData(nativeData.GetDataLen(),nativeData.GetData()))
+ dataObject->Add(textDataObject);
+ else
+ {
+ delete textDataObject;
+ textDataObject = NULL;
+ }
+ }
+ } /* block */
+ break;
+ case 'utxt':
+ {
+ // variable definition:
+ Size nativeDataSize;
+
+ if (::GetFlavorDataSize(dragRef,itemRef,'utxt',&nativeDataSize) == noErr)
+ {
+ CFMutableDataRef draggedData;
+
+ draggedData = ::CFDataCreateMutable(kCFAllocatorDefault,nativeDataSize);
+ ::CFDataSetLength(draggedData,nativeDataSize);
+ if (::GetFlavorData(dragRef,itemRef,'utxt',::CFDataGetMutableBytePtr(draggedData),&nativeDataSize,0) == noErr)
+ {
+ // convert internally used UTF-16 representation to a UTF-8 representation:
+ CFDataRef osxData;
+ CFStringRef osxString;
+
+ osxString = ::CFStringCreateFromExternalRepresentation(kCFAllocatorDefault,draggedData,kCFStringEncodingUTF16); // BOM character is handled by this function automatically
+ osxData = ::CFStringCreateExternalRepresentation(kCFAllocatorDefault,osxString,kCFStringEncodingUTF8,32);
+ if (textDataObject == NULL)
+ {
+ textDataObject = new wxTextDataObject();
+ if (textDataObject->SetData(::CFDataGetLength(osxData),::CFDataGetBytePtr(osxData)))
+ dataObject->Add(textDataObject);
+ else
+ {
+ delete textDataObject;
+ textDataObject = NULL;
+ }
+ }
+ else // overwrite data because the 'utxt' flavor has priority over the 'TEXT' flavor
+ (void) textDataObject->SetData(::CFDataGetLength(osxData),::CFDataGetBytePtr(osxData));
+ // clean up:
+ ::CFRelease(osxData);
+ ::CFRelease(osxString);
+ }
+ // clean up:
+ ::CFRelease(draggedData);
+ }
+ } /* block */
+ break;
+ }
+ }
+ }
+ else
+ dataObject = NULL;
+ return dataObject;
+} /* wxMacDataViewDataBrowserListViewControl::GetDnDDataObjects(DragReference, ItemReference) const */
+
projects / wxWidgets.git / commitdiff
