1 files changed, 109 insertions, 0 deletions
diff --git a/widget/windows/nsNativeDragSource.cpp b/widget/windows/nsNativeDragSource.cpp
new file mode 100644
index 000000000..857907076
--- /dev/null
+++ b/widget/windows/nsNativeDragSource.cpp
@@ -0,0 +1,109 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include "nsNativeDragSource.h"
+#include <stdio.h>
+#include "nsISupportsImpl.h"
+#include "nsString.h"
+#include "nsIServiceManager.h"
+#include "nsToolkit.h"
+#include "nsWidgetsCID.h"
+#include "nsIDragService.h"
+
+/*
+ * class nsNativeDragSource
+ */
+nsNativeDragSource::nsNativeDragSource(nsIDOMDataTransfer* aDataTransfer) :
+  m_cRef(0),
+  m_hCursor(nullptr),
+  mUserCancelled(false)
+{
+  mDataTransfer = do_QueryInterface(aDataTransfer);
+}
+
+nsNativeDragSource::~nsNativeDragSource()
+{
+}
+
+STDMETHODIMP
+nsNativeDragSource::QueryInterface(REFIID riid, void** ppv)
+{
+  *ppv=nullptr;
+
+  if (IID_IUnknown==riid || IID_IDropSource==riid)
+    *ppv=this;
+
+  if (nullptr!=*ppv) {
+    ((LPUNKNOWN)*ppv)->AddRef();
+    return S_OK;
+  }
+
+  return E_NOINTERFACE;
+}
+
+STDMETHODIMP_(ULONG)
+nsNativeDragSource::AddRef(void)
+{
+  ++m_cRef;
+  NS_LOG_ADDREF(this, m_cRef, "nsNativeDragSource", sizeof(*this));
+  return m_cRef;
+}
+
+STDMETHODIMP_(ULONG)
+nsNativeDragSource::Release(void)
+{
+  --m_cRef;
+  NS_LOG_RELEASE(this, m_cRef, "nsNativeDragSource");
+  if (0 != m_cRef)
+    return m_cRef;
+
+  delete this;
+  return 0;
+}
+
+STDMETHODIMP
+nsNativeDragSource::QueryContinueDrag(BOOL fEsc, DWORD grfKeyState)
+{
+  static NS_DEFINE_IID(kCDragServiceCID,  NS_DRAGSERVICE_CID);
+
+  nsCOMPtr<nsIDragService> dragService = do_GetService(kCDragServiceCID);
+  if (dragService) {
+    DWORD pos = ::GetMessagePos();
+    dragService->DragMoved(GET_X_LPARAM(pos), GET_Y_LPARAM(pos));
+  }
+
+  if (fEsc) {
+    mUserCancelled = true;
+    return DRAGDROP_S_CANCEL;
+  }
+
+  if (!(grfKeyState & MK_LBUTTON) || (grfKeyState & MK_RBUTTON))
+    return DRAGDROP_S_DROP;
+
+  return S_OK;
+}
+
+STDMETHODIMP
+nsNativeDragSource::GiveFeedback(DWORD dwEffect)
+{
+  // For drags involving tabs, we do some custom work with cursors. 
+  if (mDataTransfer) {
+    nsAutoString cursor;
+    mDataTransfer->GetMozCursor(cursor);
+    if (cursor.EqualsLiteral("default")) {
+      m_hCursor = ::LoadCursor(0, IDC_ARROW);
+    } else {
+      m_hCursor =  nullptr;
+    }
+  }
+
+  if (m_hCursor) {
+    ::SetCursor(m_hCursor);
+    return S_OK;
+  }
+  
+  // Let the system choose which cursor to apply.
+  return DRAGDROP_S_USEDEFAULTCURSORS;
+}