Mozilla/mozilla/gfx/src/nsFontList.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code, released
 * March 31, 1998.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2001
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Brian Stell <bstell@netscape.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/*
 * Implementation of nsIFontList
 */

#include "nsCOMPtr.h"
#include "nsXPCOM.h"
#include "nsFontList.h"
#include "nsGfxCIID.h"
#include "nsDependentString.h"
#include "nsIFontEnumerator.h"
#include "nsISimpleEnumerator.h"
#include "nsISupportsPrimitives.h"
#include "nsMemory.h"
#include "nsReadableUtils.h"
#include "nsXPIDLString.h"

static NS_DEFINE_IID(kCFontEnumerator, NS_FONT_ENUMERATOR_CID);

nsFontList::nsFontList()
{
}

nsFontList::~nsFontList()
{
}

NS_IMPL_ISUPPORTS1(nsFontList,nsIFontList)

/* font list enumerator */
class
nsFontListEnumerator : public nsISimpleEnumerator
{
  public:
    nsFontListEnumerator();
    virtual ~nsFontListEnumerator();

    // nsISupports interface
    NS_DECL_ISUPPORTS

    // nsISimpleEnumerator interface
    NS_DECL_NSISIMPLEENUMERATOR

    NS_IMETHOD Init(const PRUnichar *aLangGroup, const PRUnichar *aFontType);


  protected:
    PRUnichar **mFonts;
    PRUint32 mCount;
    PRUint32 mIndex;
};

nsFontListEnumerator::nsFontListEnumerator() :
  mFonts(nsnull), mCount(0), mIndex(0)
{
}

nsFontListEnumerator::~nsFontListEnumerator()
{
  if (mFonts) {
    PRUint32 i;
    for (i=0; i<mCount; i++) {
      nsMemory::Free(mFonts[i]);
    }
    nsMemory::Free(mFonts);
  }
}

NS_IMPL_ISUPPORTS1(nsFontListEnumerator, nsISimpleEnumerator)

NS_IMETHODIMP
nsFontListEnumerator::Init(const PRUnichar *aLangGroup, 
                           const PRUnichar *aFontType)
{
  nsresult rv;
  nsCOMPtr<nsIFontEnumerator> fontEnumerator;

  fontEnumerator = do_CreateInstance(kCFontEnumerator, &rv);
  if (NS_FAILED(rv))
    return rv;
 
  nsXPIDLCString langGroup;
  langGroup.Adopt(ToNewUTF8String(nsDependentString(aLangGroup)));
  nsXPIDLCString fontType;
  fontType.Adopt(ToNewUTF8String(nsDependentString(aFontType)));
  rv = fontEnumerator->EnumerateFonts(langGroup.get(), fontType.get(), 
                                        &mCount, &mFonts);
  return rv;
}

NS_IMETHODIMP
nsFontListEnumerator::HasMoreElements(PRBool *result)
{
  *result = (mIndex < mCount);
  return NS_OK;
}

NS_IMETHODIMP
nsFontListEnumerator::GetNext(nsISupports **aFont)
{
  NS_ENSURE_ARG_POINTER(aFont);
  *aFont = nsnull;
  if (mIndex >= mCount) {
    return NS_ERROR_UNEXPECTED;
  }
  PRUnichar *fontName = mFonts[mIndex++];
  nsCOMPtr<nsISupportsString> fontNameWrapper;
  nsresult rv;
  fontNameWrapper = do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID, &rv);
  NS_ENSURE_SUCCESS(rv, rv);
  NS_ENSURE_TRUE(fontNameWrapper, NS_ERROR_OUT_OF_MEMORY);
  fontNameWrapper->SetData(nsDependentString(fontName));
  *aFont = NS_STATIC_CAST(nsISupports*, fontNameWrapper);
  NS_ADDREF(*aFont);
  return NS_OK;
}

NS_IMETHODIMP
nsFontList::AvailableFonts(const PRUnichar *aLangGroup, 
                           const PRUnichar *aFontType, 
                           nsISimpleEnumerator **aFontEnumerator)
{
  NS_ENSURE_ARG(aLangGroup);
  NS_ENSURE_ARG(aFontType);
  NS_ENSURE_ARG_POINTER(aFontEnumerator);
  nsCOMPtr<nsFontListEnumerator> fontListEnum = new nsFontListEnumerator();
  NS_ENSURE_TRUE(fontListEnum.get(), NS_ERROR_OUT_OF_MEMORY);

  nsresult rv = fontListEnum->Init(aLangGroup, aFontType);
  NS_ENSURE_SUCCESS(rv, rv);

  *aFontEnumerator = NS_STATIC_CAST(nsISimpleEnumerator*, fontListEnum);
  NS_ADDREF(*aFontEnumerator);
  return NS_OK;
}