Quelle nsNativeDragSource.cpp Sprache: C

/* -*- 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 "nsServiceManagerUtils.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) {
    nsCOMPtr<nsIDragSession> session;
    dragService->GetCurrentSession(nullptr, getter_AddRefs(session));
    if (session) {
      DWORD pos = ::GetMessagePos();
      session->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;
}

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