1 files changed, 97 insertions, 0 deletions
diff --git a/widget/windows/nsNativeDragSource.cpp b/widget/windows/nsNativeDragSource.cpp
new file mode 100644
index 0000000000..1b02a6273c
--- /dev/null
+++ b/widget/windows/nsNativeDragSource.cpp
@@ -0,0 +1,97 @@
+/* -*- 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 "nsToolkit.h"
+#include "nsWidgetsCID.h"
+#include "nsIDragService.h"
+#include "mozilla/dom/DataTransfer.h"
+
+/*
+ * class nsNativeDragSource
+ */
+nsNativeDragSource::nsNativeDragSource(
+    mozilla::dom::DataTransfer* aDataTransfer)
+    : m_cRef(0), m_hCursor(nullptr), mUserCancelled(false) {
+  mDataTransfer = 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) {
+  nsCOMPtr<nsIDragService> dragService =
+      do_GetService("@mozilla.org/widget/dragservice;1");
+  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;
+}