michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "nsNativeDragSource.h"
michael@0: #include <stdio.h>
michael@0: #include "nsISupportsImpl.h"
michael@0: #include "nsString.h"
michael@0: #include "nsIServiceManager.h"
michael@0: #include "nsToolkit.h"
michael@0: #include "nsWidgetsCID.h"
michael@0: #include "nsIDragService.h"
michael@0: 
michael@0: /*
michael@0:  * class nsNativeDragSource
michael@0:  */
michael@0: nsNativeDragSource::nsNativeDragSource(nsIDOMDataTransfer* aDataTransfer) :
michael@0:   m_cRef(0),
michael@0:   m_hCursor(nullptr),
michael@0:   mUserCancelled(false)
michael@0: {
michael@0:   mDataTransfer = do_QueryInterface(aDataTransfer);
michael@0: }
michael@0: 
michael@0: nsNativeDragSource::~nsNativeDragSource()
michael@0: {
michael@0: }
michael@0: 
michael@0: STDMETHODIMP
michael@0: nsNativeDragSource::QueryInterface(REFIID riid, void** ppv)
michael@0: {
michael@0:   *ppv=nullptr;
michael@0: 
michael@0:   if (IID_IUnknown==riid || IID_IDropSource==riid)
michael@0:     *ppv=this;
michael@0: 
michael@0:   if (nullptr!=*ppv) {
michael@0:     ((LPUNKNOWN)*ppv)->AddRef();
michael@0:     return S_OK;
michael@0:   }
michael@0: 
michael@0:   return E_NOINTERFACE;
michael@0: }
michael@0: 
michael@0: STDMETHODIMP_(ULONG)
michael@0: nsNativeDragSource::AddRef(void)
michael@0: {
michael@0:   ++m_cRef;
michael@0:   NS_LOG_ADDREF(this, m_cRef, "nsNativeDragSource", sizeof(*this));
michael@0:   return m_cRef;
michael@0: }
michael@0: 
michael@0: STDMETHODIMP_(ULONG)
michael@0: nsNativeDragSource::Release(void)
michael@0: {
michael@0:   --m_cRef;
michael@0:   NS_LOG_RELEASE(this, m_cRef, "nsNativeDragSource");
michael@0:   if (0 != m_cRef)
michael@0:     return m_cRef;
michael@0: 
michael@0:   delete this;
michael@0:   return 0;
michael@0: }
michael@0: 
michael@0: STDMETHODIMP
michael@0: nsNativeDragSource::QueryContinueDrag(BOOL fEsc, DWORD grfKeyState)
michael@0: {
michael@0:   static NS_DEFINE_IID(kCDragServiceCID,  NS_DRAGSERVICE_CID);
michael@0: 
michael@0:   nsCOMPtr<nsIDragService> dragService = do_GetService(kCDragServiceCID);
michael@0:   if (dragService) {
michael@0:     DWORD pos = ::GetMessagePos();
michael@0:     dragService->DragMoved(GET_X_LPARAM(pos), GET_Y_LPARAM(pos));
michael@0:   }
michael@0: 
michael@0:   if (fEsc) {
michael@0:     mUserCancelled = true;
michael@0:     return DRAGDROP_S_CANCEL;
michael@0:   }
michael@0: 
michael@0:   if (!(grfKeyState & MK_LBUTTON) || (grfKeyState & MK_RBUTTON))
michael@0:     return DRAGDROP_S_DROP;
michael@0: 
michael@0:   return S_OK;
michael@0: }
michael@0: 
michael@0: STDMETHODIMP
michael@0: nsNativeDragSource::GiveFeedback(DWORD dwEffect)
michael@0: {
michael@0:   // For drags involving tabs, we do some custom work with cursors. 
michael@0:   if (mDataTransfer) {
michael@0:     nsAutoString cursor;
michael@0:     mDataTransfer->GetMozCursor(cursor);
michael@0:     if (cursor.EqualsLiteral("default")) {
michael@0:       m_hCursor = ::LoadCursor(0, IDC_ARROW);
michael@0:     } else {
michael@0:       m_hCursor =  nullptr;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   if (m_hCursor) {
michael@0:     ::SetCursor(m_hCursor);
michael@0:     return S_OK;
michael@0:   }
michael@0:   
michael@0:   // Let the system choose which cursor to apply.
michael@0:   return DRAGDROP_S_USEDEFAULTCURSORS;
michael@0: }