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204 lines
6.2 KiB
C++
204 lines
6.2 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the QtGui module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see http://www.qt.io/terms-conditions. For further
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** information use the contact form at http://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 or version 3 as published by the Free
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** Software Foundation and appearing in the file LICENSE.LGPLv21 and
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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** following information to ensure the GNU Lesser General Public License
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** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** As a special exception, The Qt Company gives you certain additional
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** rights. These rights are described in The Qt Company LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qiconengine.h"
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#include "qpainter.h"
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QT_BEGIN_NAMESPACE
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/*!
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\class QIconEngine
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\brief The QIconEngine class provides an abstract base class for QIcon renderers.
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\ingroup painting
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An icon engine provides the rendering functions for a QIcon. Each icon has a
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corresponding icon engine that is responsible for drawing the icon with a
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requested size, mode and state.
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The icon is rendered by the paint() function, and the icon can additionally be
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obtained as a pixmap with the pixmap() function (the default implementation
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simply uses paint() to achieve this). The addPixmap() function can be used to
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add new pixmaps to the icon engine, and is used by QIcon to add specialized
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custom pixmaps.
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The paint(), pixmap(), and addPixmap() functions are all virtual, and can
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therefore be reimplemented in subclasses of QIconEngine.
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\sa QIconEnginePlugin
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*/
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/*!
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\fn virtual void QIconEngine::paint(QPainter *painter, const QRect &rect, QIcon::Mode mode, QIcon::State state) = 0;
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Uses the given \a painter to paint the icon with the required \a mode and
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\a state into the rectangle \a rect.
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*/
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/*! Returns the actual size of the icon the engine provides for the
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requested \a size, \a mode and \a state. The default implementation
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returns the given \a size.
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*/
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QSize QIconEngine::actualSize(const QSize &size, QIcon::Mode /*mode*/, QIcon::State /*state*/)
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{
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return size;
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}
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/*!
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Destroys the icon engine.
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*/
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QIconEngine::~QIconEngine()
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{
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}
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/*!
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Returns the icon as a pixmap with the required \a size, \a mode,
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and \a state. The default implementation creates a new pixmap and
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calls paint() to fill it.
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*/
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QPixmap QIconEngine::pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state)
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{
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QPixmap pm(size);
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{
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QPainter p(&pm);
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paint(&p, QRect(QPoint(0,0),size), mode, state);
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}
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return pm;
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}
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/*!
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Called by QIcon::addPixmap(). Adds a specialized \a pixmap for the given
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\a mode and \a state. The default pixmap-based engine stores any supplied
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pixmaps, and it uses them instead of scaled pixmaps if the size of a pixmap
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matches the size of icon requested. Custom icon engines that implement
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scalable vector formats are free to ignores any extra pixmaps.
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*/
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void QIconEngine::addPixmap(const QPixmap &/*pixmap*/, QIcon::Mode /*mode*/, QIcon::State /*state*/)
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{
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}
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/*! Called by QIcon::addFile(). Adds a specialized pixmap from the
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file with the given \a fileName, \a size, \a mode and \a state. The
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default pixmap-based engine stores any supplied file names, and it
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loads the pixmaps on demand instead of using scaled pixmaps if the
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size of a pixmap matches the size of icon requested. Custom icon
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engines that implement scalable vector formats are free to ignores
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any extra files.
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*/
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void QIconEngine::addFile(const QString &/*fileName*/, const QSize &/*size*/, QIcon::Mode /*mode*/, QIcon::State /*state*/)
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{
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}
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/*!
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Returns a key that identifies this icon engine.
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*/
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QString QIconEngine::key() const
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{
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return QString();
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}
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/*!
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Returns a clone of this icon engine.
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*/
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QIconEngine *QIconEngine::clone() const
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{
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return 0;
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}
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/*!
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Reads icon engine contents from the QDataStream \a in. Returns
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true if the contents were read; otherwise returns false.
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QIconEngine's default implementation always return false.
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*/
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bool QIconEngine::read(QDataStream &)
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{
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return false;
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}
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/*!
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Writes the contents of this engine to the QDataStream \a out.
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Returns true if the contents were written; otherwise returns false.
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QIconEngine's default implementation always return false.
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*/
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bool QIconEngine::write(QDataStream &) const
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{
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return false;
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}
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/*!
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\since 4.5
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Returns sizes of all images that are contained in the engine for the
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specific \a mode and \a state.
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\note This is a helper method and depends on icon engine support, it
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may not work with all icon engines.
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*/
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QList<QSize> QIconEngine::availableSizes(QIcon::Mode mode, QIcon::State state) const
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{
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return QList<QSize>();
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}
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/*!
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\since 4.7
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Returns the name used to create the engine, if available.
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\note This is a helper method and depends on icon engine support, it
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may not work with all icon engines.
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*/
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QString QIconEngine::iconName() const
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{
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return QString();
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}
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QT_END_NAMESPACE
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