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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "private/qdeclarativeimage_p.h"
#include "private/qdeclarativeimage_p_p.h"
#include <QKeyEvent>
#include <QPainter>
QT_BEGIN_NAMESPACE
/*!
\qmlclass Image QDeclarativeImage
\since 4.7
\brief The Image element allows you to add bitmaps to a scene.
\inherits Item
The Image element supports untransformed, stretched and tiled.
For an explanation of stretching and tiling, see the fillMode property description.
Examples:
\table
\row
\o \image declarative-qtlogo1.png
\o Untransformed
\qml
Image { source: "pics/qtlogo.png" }
\endqml
\row
\o \image declarative-qtlogo2.png
\o fillMode: Stretch (default)
\qml
Image {
width: 160
height: 160
source: "pics/qtlogo.png"
}
\endqml
\row
\o \image declarative-qtlogo3.png
\o fillMode: Tile
\qml
Image {
fillMode: Image.Tile
width: 160; height: 160
source: "pics/qtlogo.png"
}
\endqml
\row
\o \image declarative-qtlogo6.png
\o fillMode: TileVertically
\qml
Image {
fillMode: Image.TileVertically
width: 160; height: 160
source: "pics/qtlogo.png"
}
\endqml
\row
\o \image declarative-qtlogo5.png
\o fillMode: TileHorizontally
\qml
Image {
fillMode: Image.TileHorizontally
width: 160; height: 160
source: "pics/qtlogo.png"
}
\endqml
\endtable
*/
/*!
\internal
\class QDeclarativeImage Image
\brief The QDeclarativeImage class provides an image item that you can add to a QDeclarativeView.
\ingroup group_coreitems
Example:
\qml
Image { source: "pics/star.png" }
\endqml
A QDeclarativeImage object can be instantiated in Qml using the tag \l Image.
*/
QDeclarativeImage::QDeclarativeImage(QDeclarativeItem *parent)
: QDeclarativeImageBase(*(new QDeclarativeImagePrivate), parent)
{
}
QDeclarativeImage::QDeclarativeImage(QDeclarativeImagePrivate &dd, QDeclarativeItem *parent)
: QDeclarativeImageBase(dd, parent)
{
}
QDeclarativeImage::~QDeclarativeImage()
{
}
/*!
\qmlproperty QPixmap Image::pixmap
This property holds the QPixmap image to display.
This is useful for displaying images provided by a C++ implementation,
for example, a model may provide a data role of type QPixmap.
*/
QPixmap QDeclarativeImage::pixmap() const
{
Q_D(const QDeclarativeImage);
return d->pix;
}
void QDeclarativeImage::setPixmap(const QPixmap &pix)
{
Q_D(QDeclarativeImage);
if (!d->url.isEmpty())
return;
d->setPixmap(pix);
}
void QDeclarativeImagePrivate::setPixmap(const QPixmap &pixmap)
{
Q_Q(QDeclarativeImage);
pix = pixmap;
q->setImplicitWidth(pix.width());
q->setImplicitHeight(pix.height());
status = pix.isNull() ? QDeclarativeImageBase::Null : QDeclarativeImageBase::Ready;
q->update();
q->pixmapChange();
}
/*!
\qmlproperty enumeration Image::fillMode
Set this property to define what happens when the image set for the item is smaller
than the size of the item.
\list
\o Stretch - the image is scaled to fit
\o PreserveAspectFit - the image is scaled uniformly to fit without cropping
\o PreserveAspectCrop - the image is scaled uniformly to fill, cropping if necessary
\o Tile - the image is duplicated horizontally and vertically
\o TileVertically - the image is stretched horizontally and tiled vertically
\o TileHorizontally - the image is stretched vertically and tiled horizontally
\endlist
\image declarative-image_fillMode.gif
*/
QDeclarativeImage::FillMode QDeclarativeImage::fillMode() const
{
Q_D(const QDeclarativeImage);
return d->fillMode;
}
void QDeclarativeImage::setFillMode(FillMode mode)
{
Q_D(QDeclarativeImage);
if (d->fillMode == mode)
return;
d->fillMode = mode;
update();
updatePaintedGeometry();
emit fillModeChanged();
}
qreal QDeclarativeImage::paintedWidth() const
{
Q_D(const QDeclarativeImage);
return d->paintedWidth;
}
qreal QDeclarativeImage::paintedHeight() const
{
Q_D(const QDeclarativeImage);
return d->paintedHeight;
}
/*!
\qmlproperty enum Image::status
This property holds the status of image loading. It can be one of:
\list
\o Null - no image has been set
\o Ready - the image has been loaded
\o Loading - the image is currently being loaded
\o Error - an error occurred while loading the image
\endlist
Note that a change in the status property does not cause anything to happen
(although it reflects what has happened with the image internally). If you wish
to react to the change in status you need to do it yourself, for example in one
of the following ways:
\list
\o Create a state, so that a state change occurs, e.g. State{name: 'loaded'; when: image.status = Image.Ready;}
\o Do something inside the onStatusChanged signal handler, e.g. Image{id: image; onStatusChanged: if(image.status == Image.Ready) console.log('Loaded');}
\o Bind to the status variable somewhere, e.g. Text{text: if(image.status!=Image.Ready){'Not Loaded';}else{'Loaded';}}
\endlist
\sa progress
*/
/*!
\qmlproperty real Image::progress
This property holds the progress of image loading, from 0.0 (nothing loaded)
to 1.0 (finished).
\sa status
*/
/*!
\qmlproperty bool Image::smooth
Set this property if you want the image to be smoothly filtered when scaled or
transformed. Smooth filtering gives better visual quality, but is slower. If
the image is displayed at its natural size, this property has no visual or
performance effect.
\note Generally scaling artifacts are only visible if the image is stationary on
the screen. A common pattern when animating an image is to disable smooth
filtering at the beginning of the animation and reenable it at the conclusion.
*/
/*!
\qmlproperty QSize Image::sourceSize
This properties is the size of the loaded image, in pixels.
If you set this property explicitly, you can to control the storage
used by a loaded image. The image will be scaled down if its intrinsic size
is greater than this value.
If only one dimension of the size is set (and the other left at 0), the
unset dimension will be set in proportion to the set dimension to preserve
the source image aspect ratio. The fillMode is independent of this.
Unlike setting the width and height properties, which merely scale the painting
of the image, this property affects the number of pixels stored.
\e{Changing this property dynamically will lead to the image source being reloaded,
potentially even from the network if it is not in the disk cache.}
If the source is an instrinsically scalable image (eg. SVG), this property
determines the size of the loaded image regardless of intrinsic size. You should
avoid changing this property dynamically - rendering an SVG is \e slow compared
to an image.
If the source is a non-scalable image (eg. JPEG), the loaded image will
be no greater than this property specifies. For some formats (currently only JPEG),
the whole image will never actually be loaded into memory.
*/
void QDeclarativeImage::updatePaintedGeometry()
{
Q_D(QDeclarativeImage);
if (d->fillMode == PreserveAspectFit) {
if (!d->pix.width() || !d->pix.height())
return;
qreal widthScale = width() / qreal(d->pix.width());
qreal heightScale = height() / qreal(d->pix.height());
if (widthScale <= heightScale) {
d->paintedWidth = width();
d->paintedHeight = widthScale * qreal(d->pix.height());
} else if(heightScale < widthScale) {
d->paintedWidth = heightScale * qreal(d->pix.width());
d->paintedHeight = height();
}
if (widthValid() && !heightValid()) {
setImplicitHeight(d->paintedHeight);
}
if (heightValid() && !widthValid()) {
setImplicitWidth(d->paintedWidth);
}
} else {
d->paintedWidth = width();
d->paintedHeight = height();
}
emit paintedGeometryChanged();
}
void QDeclarativeImage::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry)
{
QDeclarativeImageBase::geometryChanged(newGeometry, oldGeometry);
updatePaintedGeometry();
}
/*!
\qmlproperty url Image::source
Image can handle any image format supported by Qt, loaded from any URL scheme supported by Qt.
The URL may be absolute, or relative to the URL of the component.
*/
/*!
\qmlproperty bool Image::asynchronous
Specifies that images on the local filesystem should be loaded
asynchronously in a separate thread. The default value is
false, causing the user interface thread to block while the
image is loaded. Setting \a asynchronous to true is useful where
maintaining a responsive user interface is more desireable
than having images immediately visible.
Note that this property is only valid for images read from the
local filesystem. Images loaded via a network resource (e.g. HTTP)
are always loaded asynchonously.
*/
void QDeclarativeImage::paint(QPainter *p, const QStyleOptionGraphicsItem *, QWidget *)
{
Q_D(QDeclarativeImage);
if (d->pix.isNull())
return;
bool oldAA = p->testRenderHint(QPainter::Antialiasing);
bool oldSmooth = p->testRenderHint(QPainter::SmoothPixmapTransform);
if (d->smooth)
p->setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform, d->smooth);
if (width() != d->pix.width() || height() != d->pix.height()) {
if (d->fillMode >= Tile) {
if (d->fillMode == Tile)
p->drawTiledPixmap(QRectF(0,0,width(),height()), d->pix);
else if (d->fillMode == TileVertically)
p->drawTiledPixmap(QRectF(0,0,d->pix.width(),height()), d->pix);
else
p->drawTiledPixmap(QRectF(0,0,width(),d->pix.height()), d->pix);
} else {
qreal widthScale = width() / qreal(d->pix.width());
qreal heightScale = height() / qreal(d->pix.height());
QTransform scale;
if (d->fillMode == PreserveAspectFit) {
if (widthScale <= heightScale) {
heightScale = widthScale;
scale.translate(0, (height() - heightScale * d->pix.height()) / 2);
} else if(heightScale < widthScale) {
widthScale = heightScale;
scale.translate((width() - widthScale * d->pix.width()) / 2, 0);
}
} else if (d->fillMode == PreserveAspectCrop) {
if (widthScale < heightScale) {
widthScale = heightScale;
scale.translate((width() - widthScale * d->pix.width()) / 2, 0);
} else if(heightScale < widthScale) {
heightScale = widthScale;
scale.translate(0, (height() - heightScale * d->pix.height()) / 2);
}
}
if (clip()) {
p->save();
p->setClipRect(boundingRect(), Qt::IntersectClip);
}
scale.scale(widthScale, heightScale);
QTransform old = p->transform();
p->setWorldTransform(scale * old);
p->drawPixmap(0, 0, d->pix);
p->setWorldTransform(old);
if (clip()) {
p->restore();
}
}
} else {
p->drawPixmap(0, 0, d->pix);
}
if (d->smooth) {
p->setRenderHint(QPainter::Antialiasing, oldAA);
p->setRenderHint(QPainter::SmoothPixmapTransform, oldSmooth);
}
}
void QDeclarativeImage::pixmapChange()
{
updatePaintedGeometry();
emit pixmapChanged();
}
QT_END_NAMESPACE
|