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