gecko-dev/widget/xpwidgets/nsBaseClipboard.cpp

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#include "nsBaseClipboard.h"

#include "nsIClipboardOwner.h"
#include "nsCOMPtr.h"
#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"

nsBaseClipboard::nsBaseClipboard()
{
  mClipboardOwner          = nsnull;
  mTransferable            = nsnull;
  mIgnoreEmptyNotification = false;

}

nsBaseClipboard::~nsBaseClipboard()
{
  EmptyClipboard(kSelectionClipboard);
  EmptyClipboard(kGlobalClipboard);
}

NS_IMPL_ISUPPORTS1(nsBaseClipboard, nsIClipboard)

/**
  * Sets the transferable object
  *
  */
NS_IMETHODIMP nsBaseClipboard::SetData(nsITransferable * aTransferable, nsIClipboardOwner * anOwner,
                                        PRInt32 aWhichClipboard)
{
  NS_ASSERTION ( aTransferable, "clipboard given a null transferable" );

  if (aTransferable == mTransferable && anOwner == mClipboardOwner)
    return NS_OK;
  bool selectClipPresent;
  SupportsSelectionClipboard(&selectClipPresent);
  if ( !selectClipPresent && aWhichClipboard != kGlobalClipboard )
    return NS_ERROR_FAILURE;

  EmptyClipboard(aWhichClipboard);

  mClipboardOwner = anOwner;
  if ( anOwner )
    NS_ADDREF(mClipboardOwner);

  mTransferable = aTransferable;
  
  nsresult rv = NS_ERROR_FAILURE;

  if ( mTransferable ) {
    NS_ADDREF(mTransferable);
    if (!mPrivacyHandler) {
      rv = NS_NewClipboardPrivacyHandler(getter_AddRefs(mPrivacyHandler));
      NS_ENSURE_SUCCESS(rv, rv);
    }
    rv = mPrivacyHandler->PrepareDataForClipboard(mTransferable);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = SetNativeClipboardData(aWhichClipboard);
  }
  
  return rv;
}

/**
  * Gets the transferable object
  *
  */
NS_IMETHODIMP nsBaseClipboard::GetData(nsITransferable * aTransferable, PRInt32 aWhichClipboard)
{
  NS_ASSERTION ( aTransferable, "clipboard given a null transferable" );
  
  bool selectClipPresent;
  SupportsSelectionClipboard(&selectClipPresent);
  if ( !selectClipPresent && aWhichClipboard != kGlobalClipboard )
    return NS_ERROR_FAILURE;

  if ( aTransferable )
    return GetNativeClipboardData(aTransferable, aWhichClipboard);

  return NS_ERROR_FAILURE;
}

NS_IMETHODIMP nsBaseClipboard::EmptyClipboard(PRInt32 aWhichClipboard)
{
  bool selectClipPresent;
  SupportsSelectionClipboard(&selectClipPresent);
  if ( !selectClipPresent && aWhichClipboard != kGlobalClipboard )
    return NS_ERROR_FAILURE;

  if (mIgnoreEmptyNotification)
    return NS_OK;

  if ( mClipboardOwner ) {
    mClipboardOwner->LosingOwnership(mTransferable);
    NS_RELEASE(mClipboardOwner);
  }

  NS_IF_RELEASE(mTransferable);

  return NS_OK;
}

NS_IMETHODIMP
nsBaseClipboard::HasDataMatchingFlavors(const char** aFlavorList,
                                        PRUint32 aLength,
                                        PRInt32 aWhichClipboard,
                                        bool* outResult) 
{
  *outResult = true;  // say we always do.
  return NS_OK;
}

NS_IMETHODIMP
nsBaseClipboard::SupportsSelectionClipboard(bool* _retval)
{
  *_retval = false;   // we don't support the selection clipboard by default.
  return NS_OK;
}