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/***************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Qt Software Information (qt-info@nokia.com)
**
**
** Non-Open Source Usage
**
** Licensees may use this file in accordance with the Qt Beta Version
** License Agreement, Agreement version 2.2 provided with the Software or,
** alternatively, in accordance with the terms contained in a written
** agreement between you and Nokia.
**
** GNU General Public License Usage
**
** Alternatively, this file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the packaging
** of this file. Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
**
** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
** http://www.gnu.org/copyleft/gpl.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt GPL Exception
** version 1.3, included in the file GPL_EXCEPTION.txt in this package.
**
***************************************************************************/
#include "fileiconprovider.h"
#include <QtGui/QApplication>
#include <QtGui/QStyle>
#include <QtGui/QPainter>
using namespace Core;
/*!
\class FileIconProvider
Provides icons based on file suffixes.
The class is a singleton: It's instance can be accessed via the static instance() method.
Plugins can register custom icons via registerIconSuffix(), and retrieve icons via the icon()
method.
*/
FileIconProvider *FileIconProvider::m_instance = 0;
FileIconProvider::FileIconProvider()
: m_unknownFileIcon(qApp->style()->standardIcon(QStyle::SP_FileIcon))
{
}
FileIconProvider::~FileIconProvider()
{
m_instance = 0;
}
/*!
Returns the icon associated with the file suffix in fileInfo. If there is none,
the default icon of the operating system is returned.
*/
QIcon FileIconProvider::icon(const QFileInfo &fileInfo)
{
const QString suffix = fileInfo.suffix();
QIcon icon = iconForSuffix(suffix);
if (icon.isNull()) {
// Get icon from OS and store it in the cache
// Disabled since for now we'll make sure that all icons fit with our
// own custom icons by returning an empty one if we don't know it.
#ifdef Q_OS_WIN
// This is incorrect if the OS does not always return the same icon for the
// same suffix (Mac OS X), but should speed up the retrieval a lot ...
icon = m_systemIconProvider.icon(fileInfo);
if (!suffix.isEmpty())
registerIconOverlayForSuffix(icon, suffix);
#else
if (fileInfo.isDir()) {
icon = m_systemIconProvider.icon(fileInfo);
} else {
icon = m_unknownFileIcon;
}
#endif
}
return icon;
}
// Creates a pixmap with baseicon at size and overlayous overlayIcon over it.
QPixmap FileIconProvider::overlayIcon(QStyle::StandardPixmap baseIcon, const QIcon &overlayIcon, const QSize &size) const
{
QPixmap iconPixmap = qApp->style()->standardIcon(baseIcon).pixmap(size);
QPainter painter(&iconPixmap);
painter.drawPixmap(0, 0, overlayIcon.pixmap(size));
painter.end();
return iconPixmap;
}
/*!
Registers an icon for a given suffix, overlaying the system file icon
*/
void FileIconProvider::registerIconOverlayForSuffix(const QIcon &icon, const QString &suffix)
{
QPixmap fileIconPixmap = overlayIcon(QStyle::SP_FileIcon, icon, QSize(16, 16));
// delete old icon, if it exists
QList<QPair<QString,QIcon> >::iterator iter = m_cache.begin();
for (; iter != m_cache.end(); ++iter) {
if ((*iter).first == suffix) {
iter = m_cache.erase(iter);
break;
}
}
QPair<QString,QIcon> newEntry(suffix, fileIconPixmap);
m_cache.append(newEntry);
}
/*!
Returns an icon for the given suffix, or an empty one if none registered.
*/
QIcon FileIconProvider::iconForSuffix(const QString &suffix) const
{
QIcon icon;
#ifndef Q_OS_WIN // On windows we use the file system icons
if (suffix.isEmpty())
return icon;
QList<QPair<QString,QIcon> >::const_iterator iter = m_cache.constBegin();
for (; iter != m_cache.constEnd(); ++iter) {
if ((*iter).first == suffix) {
icon = (*iter).second;
break;
}
}
#endif
return icon;
}
/*!
Returns the sole instance of FileIconProvider.
*/
FileIconProvider *FileIconProvider::instance()
{
if (!m_instance)
m_instance = new FileIconProvider;
return m_instance;
}
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