The Tor Browser: widget/windows/nsNativeDragSource.cpp@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #include "nsNativeDragSource.h"

     7 #include <stdio.h>

     8 #include "nsISupportsImpl.h"

     9 #include "nsString.h"

    10 #include "nsIServiceManager.h"

    11 #include "nsToolkit.h"

    12 #include "nsWidgetsCID.h"

    13 #include "nsIDragService.h"

    15 /*

    16  * class nsNativeDragSource

    17  */

    18 nsNativeDragSource::nsNativeDragSource(nsIDOMDataTransfer* aDataTransfer) :

    19   m_cRef(0),

    20   m_hCursor(nullptr),

    21   mUserCancelled(false)

    22 {

    23   mDataTransfer = do_QueryInterface(aDataTransfer);

    24 }

    26 nsNativeDragSource::~nsNativeDragSource()

    27 {

    28 }

    30 STDMETHODIMP

    31 nsNativeDragSource::QueryInterface(REFIID riid, void** ppv)

    32 {

    33   *ppv=nullptr;

    35   if (IID_IUnknown==riid || IID_IDropSource==riid)

    36     *ppv=this;

    38   if (nullptr!=*ppv) {

    39     ((LPUNKNOWN)*ppv)->AddRef();

    40     return S_OK;

    41   }

    43   return E_NOINTERFACE;

    44 }

    46 STDMETHODIMP_(ULONG)

    47 nsNativeDragSource::AddRef(void)

    48 {

    49   ++m_cRef;

    50   NS_LOG_ADDREF(this, m_cRef, "nsNativeDragSource", sizeof(*this));

    51   return m_cRef;

    52 }

    54 STDMETHODIMP_(ULONG)

    55 nsNativeDragSource::Release(void)

    56 {

    57   --m_cRef;

    58   NS_LOG_RELEASE(this, m_cRef, "nsNativeDragSource");

    59   if (0 != m_cRef)

    60     return m_cRef;

    62   delete this;

    63   return 0;

    64 }

    66 STDMETHODIMP

    67 nsNativeDragSource::QueryContinueDrag(BOOL fEsc, DWORD grfKeyState)

    68 {

    69   static NS_DEFINE_IID(kCDragServiceCID,  NS_DRAGSERVICE_CID);

    71   nsCOMPtr<nsIDragService> dragService = do_GetService(kCDragServiceCID);

    72   if (dragService) {

    73     DWORD pos = ::GetMessagePos();

    74     dragService->DragMoved(GET_X_LPARAM(pos), GET_Y_LPARAM(pos));

    75   }

    77   if (fEsc) {

    78     mUserCancelled = true;

    79     return DRAGDROP_S_CANCEL;

    80   }

    82   if (!(grfKeyState & MK_LBUTTON) || (grfKeyState & MK_RBUTTON))

    83     return DRAGDROP_S_DROP;

    85   return S_OK;

    86 }

    88 STDMETHODIMP

    89 nsNativeDragSource::GiveFeedback(DWORD dwEffect)

    90 {

    91   // For drags involving tabs, we do some custom work with cursors.

    92   if (mDataTransfer) {

    93     nsAutoString cursor;

    94     mDataTransfer->GetMozCursor(cursor);

    95     if (cursor.EqualsLiteral("default")) {

    96       m_hCursor = ::LoadCursor(0, IDC_ARROW);

    97     } else {

    98       m_hCursor =  nullptr;

    99     }

   100   }

   102   if (m_hCursor) {

   103     ::SetCursor(m_hCursor);

   104     return S_OK;

   105   }

   107   // Let the system choose which cursor to apply.

   108   return DRAGDROP_S_USEDEFAULTCURSORS;

   109 }

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