Quelle nsDataObjCollection.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 <shlobj.h>

#include "nsDataObjCollection.h"
#include "nsClipboard.h"
#include "IEnumFE.h"

#include <ole2.h>

// {25589C3E-1FAC-47b9-BF43-CAEA89B79533}
const IID IID_IDataObjCollection = {
    0x25589c3e,
    0x1fac,
    0x47b9,
    {0xbf, 0x43, 0xca, 0xea, 0x89, 0xb7, 0x95, 0x33}};

/*
* Class nsDataObjCollection
*/

nsDataObjCollection::nsDataObjCollection() {}

nsDataObjCollection::~nsDataObjCollection() { mDataObjects.Clear(); }

// IUnknown interface methods - see iunknown.h for documentation
STDMETHODIMP nsDataObjCollection::QueryInterface(REFIID riid, void** ppv) {
  *ppv = nullptr;

  if ((IID_IUnknown == riid) || (IID_IDataObject == riid)) {
    *ppv = static_cast<IDataObject*>(this);
    AddRef();
    return NOERROR;
  }

  if (IID_IDataObjCollection == riid) {
    *ppv = static_cast<nsIDataObjCollection*>(this);
    AddRef();
    return NOERROR;
  }
  // offer to operate asynchronously (required by nsDragService)
  if (IID_IDataObjectAsyncCapability == riid) {
    *ppv = static_cast<IDataObjectAsyncCapability*>(this);
    AddRef();
    return NOERROR;
  }

  return E_NOINTERFACE;
}

STDMETHODIMP_(ULONG) nsDataObjCollection::AddRef() { return ++m_cRef; }

STDMETHODIMP_(ULONG) nsDataObjCollection::Release() {
  if (0 != --m_cRef) return m_cRef;

  delete this;

  return 0;
}

// IDataObject methods
STDMETHODIMP nsDataObjCollection::GetData(LPFORMATETC pFE, LPSTGMEDIUM pSTM) {
  static CLIPFORMAT fileDescriptorFlavorA =
      ::RegisterClipboardFormat(CFSTR_FILEDESCRIPTORA);
  static CLIPFORMAT fileDescriptorFlavorW =
      ::RegisterClipboardFormat(CFSTR_FILEDESCRIPTORW);
  static CLIPFORMAT fileFlavor = ::RegisterClipboardFormat(CFSTR_FILECONTENTS);

  switch (pFE->cfFormat) {
    case CF_TEXT:
    case CF_UNICODETEXT:
      return GetText(pFE, pSTM);
    case CF_HDROP:
      return GetFile(pFE, pSTM);
    default:
      if (pFE->cfFormat == fileDescriptorFlavorA ||
          pFE->cfFormat == fileDescriptorFlavorW) {
        return GetFileDescriptors(pFE, pSTM);
      }
      if (pFE->cfFormat == fileFlavor) {
        return GetFileContents(pFE, pSTM);
      }
  }
  return GetFirstSupporting(pFE, pSTM);
}

STDMETHODIMP nsDataObjCollection::GetDataHere(LPFORMATETC pFE,
                                              LPSTGMEDIUM pSTM) {
  return E_FAIL;
}

// Other objects querying to see if we support a particular format
STDMETHODIMP nsDataObjCollection::QueryGetData(LPFORMATETC pFE) {
  UINT format = nsClipboard::GetFormat(MULTI_MIME);

  if (format == pFE->cfFormat) {
    return S_OK;
  }

  for (uint32_t i = 0; i < mDataObjects.Length(); ++i) {
    IDataObject* dataObj = mDataObjects.ElementAt(i);
    if (S_OK == dataObj->QueryGetData(pFE)) {
      return S_OK;
    }
  }

  return DV_E_FORMATETC;
}

STDMETHODIMP nsDataObjCollection::SetData(LPFORMATETC pFE, LPSTGMEDIUM pSTM,
                                          BOOL fRelease) {
  // Set arbitrary data formats on the first object in the collection and let
  // it handle the heavy lifting
  if (mDataObjects.Length() == 0) return E_FAIL;
  return mDataObjects.ElementAt(0)->SetData(pFE, pSTM, fRelease);
}

// Registers a DataFlavor/FE pair
void nsDataObjCollection::AddDataFlavor(const char* aDataFlavor,
                                        LPFORMATETC aFE) {
  // Add the FormatEtc to our list if it's not already there.  We don't care
  // about the internal aDataFlavor because nsDataObj handles that.
  IEnumFORMATETC* ifEtc;
  FORMATETC fEtc;
  ULONG num;
  if (S_OK != this->EnumFormatEtc(DATADIR_GET, &ifEtc)) return;
  while (S_OK == ifEtc->Next(1, &fEtc, &num)) {
    NS_ASSERTION(
        1 == num,
        "Bit off more than we can chew in nsDataObjCollection::AddDataFlavor");
    if (FormatsMatch(fEtc, *aFE)) {
      ifEtc->Release();
      return;
    }
  }  // If we didn't find a matching format, add this one
  ifEtc->Release();
  m_enumFE->AddFormatEtc(aFE);
}

// We accept ownership of the nsDataObj which we free on destruction
void nsDataObjCollection::AddDataObject(IDataObject* aDataObj) {
  nsDataObj* dataObj = reinterpret_cast<nsDataObj*>(aDataObj);
  mDataObjects.AppendElement(dataObj);
}

// Methods for getting data
HRESULT nsDataObjCollection::GetFile(LPFORMATETC pFE, LPSTGMEDIUM pSTM) {
  STGMEDIUM workingmedium;
  FORMATETC fe = *pFE;
  HGLOBAL hGlobalMemory;
  HRESULT hr;
  // Make enough space for the header and the trailing null
  uint32_t buffersize = sizeof(DROPFILES) + sizeof(char16_t);
  uint32_t alloclen = 0;
  char16_t* realbuffer;
  nsAutoString filename;

  hGlobalMemory = GlobalAlloc(GHND, buffersize);

  for (uint32_t i = 0; i < mDataObjects.Length(); ++i) {
    nsDataObj* dataObj = mDataObjects.ElementAt(i);
    hr = dataObj->GetData(&fe, &workingmedium);
    if (hr != S_OK) {
      switch (hr) {
        case DV_E_FORMATETC:
          continue;
        default:
          return hr;
      }
    }
    // Now we need to pull out the filename
    char16_t* buffer = (char16_t*)GlobalLock(workingmedium.hGlobal);
    if (buffer == nullptr) return E_FAIL;
    buffer += sizeof(DROPFILES) / sizeof(char16_t);
    filename = buffer;
    GlobalUnlock(workingmedium.hGlobal);
    ReleaseStgMedium(&workingmedium);
    // Now put the filename into our buffer
    alloclen = (filename.Length() + 1) * sizeof(char16_t);
    hGlobalMemory = ::GlobalReAlloc(hGlobalMemory, buffersize + alloclen, GHND);
    if (hGlobalMemory == nullptr) return E_FAIL;
    realbuffer = (char16_t*)((char*)GlobalLock(hGlobalMemory) + buffersize);
    if (!realbuffer) return E_FAIL;
    realbuffer--;  // Overwrite the preceding null
    memcpy(realbuffer, filename.get(), alloclen);
    GlobalUnlock(hGlobalMemory);
    buffersize += alloclen;
  }
  // We get the last null (on the double null terminator) for free since we used
  // the zero memory flag when we allocated.  All we need to do is fill the
  // DROPFILES structure
  DROPFILES* df = (DROPFILES*)GlobalLock(hGlobalMemory);
  if (!df) return E_FAIL;
  df->pFiles = sizeof(DROPFILES);  // Offset to start of file name string
  df->fNC = 0;
  df->pt.x = 0;
  df->pt.y = 0;
  df->fWide = TRUE;  // utf-16 chars
  GlobalUnlock(hGlobalMemory);
  // Finally fill out the STGMEDIUM struct
  pSTM->tymed = TYMED_HGLOBAL;
  pSTM->pUnkForRelease = nullptr;  // Caller gets to free the data
  pSTM->hGlobal = hGlobalMemory;
  return S_OK;
}

HRESULT nsDataObjCollection::GetText(LPFORMATETC pFE, LPSTGMEDIUM pSTM) {
  STGMEDIUM workingmedium;
  FORMATETC fe = *pFE;
  HGLOBAL hGlobalMemory;
  HRESULT hr;
  uint32_t buffersize = 1;
  uint32_t alloclen = 0;

  hGlobalMemory = GlobalAlloc(GHND, buffersize);

  if (pFE->cfFormat == CF_TEXT) {
    nsAutoCString text;
    for (uint32_t i = 0; i < mDataObjects.Length(); ++i) {
      nsDataObj* dataObj = mDataObjects.ElementAt(i);
      hr = dataObj->GetData(&fe, &workingmedium);
      if (hr != S_OK) {
        switch (hr) {
          case DV_E_FORMATETC:
            continue;
          default:
            return hr;
        }
      }
      // Now we need to pull out the text
      char* buffer = (char*)GlobalLock(workingmedium.hGlobal);
      if (buffer == nullptr) return E_FAIL;
      text = buffer;
      GlobalUnlock(workingmedium.hGlobal);
      ReleaseStgMedium(&workingmedium);
      // Now put the text into our buffer
      alloclen = text.Length();
      hGlobalMemory =
          ::GlobalReAlloc(hGlobalMemory, buffersize + alloclen, GHND);
      if (hGlobalMemory == nullptr) return E_FAIL;
      buffer = ((char*)GlobalLock(hGlobalMemory) + buffersize);
      if (!buffer) return E_FAIL;
      buffer--;  // Overwrite the preceding null
      memcpy(buffer, text.get(), alloclen);
      GlobalUnlock(hGlobalMemory);
      buffersize += alloclen;
    }
    pSTM->tymed = TYMED_HGLOBAL;
    pSTM->pUnkForRelease = nullptr;  // Caller gets to free the data
    pSTM->hGlobal = hGlobalMemory;
    return S_OK;
  }
  if (pFE->cfFormat == CF_UNICODETEXT) {
    buffersize = sizeof(char16_t);
    nsAutoString text;
    for (uint32_t i = 0; i < mDataObjects.Length(); ++i) {
      nsDataObj* dataObj = mDataObjects.ElementAt(i);
      hr = dataObj->GetData(&fe, &workingmedium);
      if (hr != S_OK) {
        switch (hr) {
          case DV_E_FORMATETC:
            continue;
          default:
            return hr;
        }
      }
      // Now we need to pull out the text
      char16_t* buffer = (char16_t*)GlobalLock(workingmedium.hGlobal);
      if (buffer == nullptr) return E_FAIL;
      text = buffer;
      GlobalUnlock(workingmedium.hGlobal);
      ReleaseStgMedium(&workingmedium);
      // Now put the text into our buffer
      alloclen = text.Length() * sizeof(char16_t);
      hGlobalMemory =
          ::GlobalReAlloc(hGlobalMemory, buffersize + alloclen, GHND);
      if (hGlobalMemory == nullptr) return E_FAIL;
      buffer = (char16_t*)((char*)GlobalLock(hGlobalMemory) + buffersize);
      if (!buffer) return E_FAIL;
      buffer--;  // Overwrite the preceding null
      memcpy(buffer, text.get(), alloclen);
      GlobalUnlock(hGlobalMemory);
      buffersize += alloclen;
    }
    pSTM->tymed = TYMED_HGLOBAL;
    pSTM->pUnkForRelease = nullptr;  // Caller gets to free the data
    pSTM->hGlobal = hGlobalMemory;
    return S_OK;
  }

  return E_FAIL;
}

HRESULT nsDataObjCollection::GetFileDescriptors(LPFORMATETC pFE,
                                                LPSTGMEDIUM pSTM) {
  STGMEDIUM workingmedium;
  FORMATETC fe = *pFE;
  HGLOBAL hGlobalMemory;
  HRESULT hr;
  uint32_t buffersize = sizeof(UINT);
  uint32_t alloclen = sizeof(FILEDESCRIPTOR);

  hGlobalMemory = GlobalAlloc(GHND, buffersize);

  for (uint32_t i = 0; i < mDataObjects.Length(); ++i) {
    nsDataObj* dataObj = mDataObjects.ElementAt(i);
    hr = dataObj->GetData(&fe, &workingmedium);
    if (hr != S_OK) {
      switch (hr) {
        case DV_E_FORMATETC:
          continue;
        default:
          return hr;
      }
    }
    // Now we need to pull out the filedescriptor
    FILEDESCRIPTOR* buffer =
        (FILEDESCRIPTOR*)((char*)GlobalLock(workingmedium.hGlobal) +
                          sizeof(UINT));
    if (buffer == nullptr) return E_FAIL;
    hGlobalMemory = ::GlobalReAlloc(hGlobalMemory, buffersize + alloclen, GHND);
    if (hGlobalMemory == nullptr) return E_FAIL;
    FILEGROUPDESCRIPTOR* realbuffer =
        (FILEGROUPDESCRIPTOR*)GlobalLock(hGlobalMemory);
    if (!realbuffer) return E_FAIL;
    FILEDESCRIPTOR* copyloc = (FILEDESCRIPTOR*)((char*)realbuffer + buffersize);
    memcpy(copyloc, buffer, alloclen);
    realbuffer->cItems++;
    GlobalUnlock(hGlobalMemory);
    GlobalUnlock(workingmedium.hGlobal);
    ReleaseStgMedium(&workingmedium);
    buffersize += alloclen;
  }
  pSTM->tymed = TYMED_HGLOBAL;
  pSTM->pUnkForRelease = nullptr;  // Caller gets to free the data
  pSTM->hGlobal = hGlobalMemory;
  return S_OK;
}

HRESULT nsDataObjCollection::GetFileContents(LPFORMATETC pFE,
                                             LPSTGMEDIUM pSTM) {
  ULONG num = 0;
  ULONG numwanted = (pFE->lindex == -1) ? 0 : pFE->lindex;
  FORMATETC fEtc = *pFE;
  fEtc.lindex = -1;  // We're lying to the data object so it thinks it's alone

  // The key for this data type is to figure out which data object the index
  // corresponds to and then just pass it along
  for (uint32_t i = 0; i < mDataObjects.Length(); ++i) {
    nsDataObj* dataObj = mDataObjects.ElementAt(i);
    if (dataObj->QueryGetData(&fEtc) != S_OK) continue;
    if (num == numwanted) return dataObj->GetData(pFE, pSTM);
    num++;
  }
  return DV_E_LINDEX;
}

HRESULT nsDataObjCollection::GetFirstSupporting(LPFORMATETC pFE,
                                                LPSTGMEDIUM pSTM) {
  // There is no way to pass more than one of this, so just find the first data
  // object that supports it and pass it along
  for (uint32_t i = 0; i < mDataObjects.Length(); ++i) {
    if (mDataObjects.ElementAt(i)->QueryGetData(pFE) == S_OK)
      return mDataObjects.ElementAt(i)->GetData(pFE, pSTM);
  }
  return DV_E_FORMATETC;
}

quality90%

¤ Dauer der Verarbeitung: 0.16 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.