gecko-dev/widget/windows/nsNativeDragSource.cpp

142 строки
3.8 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsNativeDragSource.h"
#include <stdio.h>
#include "nsISupportsImpl.h"
#include "nsString.h"
#include "nsIServiceManager.h"
#include "nsToolkit.h"
#include "nsWidgetsCID.h"
#include "nsIDragService.h"
static NS_DEFINE_IID(kCDragServiceCID, NS_DRAGSERVICE_CID);
/*
* class nsNativeDragSource
*/
nsNativeDragSource::nsNativeDragSource(nsIDOMDataTransfer* aDataTransfer) :
m_cRef(0),
m_hCursor(nsnull),
mUserCancelled(false)
{
mDataTransfer = do_QueryInterface(aDataTransfer);
}
nsNativeDragSource::~nsNativeDragSource()
{
}
STDMETHODIMP
nsNativeDragSource::QueryInterface(REFIID riid, void** ppv)
{
*ppv=NULL;
if (IID_IUnknown==riid || IID_IDropSource==riid)
*ppv=this;
if (NULL!=*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(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 = nsnull;
}
}
if (m_hCursor) {
::SetCursor(m_hCursor);
return S_OK;
}
// Let the system choose which cursor to apply.
return DRAGDROP_S_USEDEFAULTCURSORS;
}