third_party/WebKit/Source/core/clipboard/DataTransferItem.cpp

/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
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#include "core/clipboard/DataTransferItem.h"

#include "bindings/core/v8/V8Binding.h"
#include "core/clipboard/DataObjectItem.h"
#include "core/clipboard/DataTransfer.h"
#include "core/dom/StringCallback.h"
#include "core/dom/TaskRunnerHelper.h"
#include "core/inspector/InspectorInstrumentation.h"
#include "public/platform/WebTraceLocation.h"
#include "wtf/StdLibExtras.h"
#include "wtf/text/WTFString.h"

namespace blink {

DataTransferItem* DataTransferItem::create(DataTransfer* dataTransfer,
                                           DataObjectItem* item) {
  return new DataTransferItem(dataTransfer, item);
}

String DataTransferItem::kind() const {
  DEFINE_STATIC_LOCAL(const String, kindString, ("string"));
  DEFINE_STATIC_LOCAL(const String, kindFile, ("file"));
  if (!m_dataTransfer->canReadTypes())
    return String();
  switch (m_item->kind()) {
    case DataObjectItem::StringKind:
      return kindString;
    case DataObjectItem::FileKind:
      return kindFile;
  }
  ASSERT_NOT_REACHED();
  return String();
}

String DataTransferItem::type() const {
  if (!m_dataTransfer->canReadTypes())
    return String();
  return m_item->type();
}

static void runGetAsStringTask(ExecutionContext* context,
                               StringCallback* callback,
                               const String& data) {
  probe::AsyncTask asyncTask(context, callback);
  if (context)
    callback->handleEvent(data);
}

void DataTransferItem::getAsString(ScriptState* scriptState,
                                   StringCallback* callback) const {
  if (!m_dataTransfer->canReadData())
    return;
  if (!callback || m_item->kind() != DataObjectItem::StringKind)
    return;

  ExecutionContext* context = scriptState->getExecutionContext();
  probe::asyncTaskScheduled(context, "DataTransferItem.getAsString", callback);
  TaskRunnerHelper::get(TaskType::UserInteraction, scriptState)
      ->postTask(BLINK_FROM_HERE,
                 WTF::bind(&runGetAsStringTask, wrapWeakPersistent(context),
                           wrapPersistent(callback), m_item->getAsString()));
}

File* DataTransferItem::getAsFile() const {
  if (!m_dataTransfer->canReadData())
    return nullptr;

  return m_item->getAsFile();
}

DataTransferItem::DataTransferItem(DataTransfer* dataTransfer,
                                   DataObjectItem* item)
    : m_dataTransfer(dataTransfer), m_item(item) {}

DEFINE_TRACE(DataTransferItem) {
  visitor->trace(m_dataTransfer);
  visitor->trace(m_item);
}

}  // namespace blink