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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 "qdeclarativeview.h"
#include <qdeclarative.h>
#include <qdeclarativeitem.h>
#include <qdeclarativeengine.h>
#include <qdeclarativecontext.h>
#include <qdeclarativedebug_p.h>
#include <qdeclarativedebugservice_p.h>
#include <qdeclarativeglobal_p.h>
#include <qdeclarativeguard_p.h>
#include <qscriptvalueiterator.h>
#include <qdebug.h>
#include <qtimer.h>
#include <qevent.h>
#include <qdir.h>
#include <qcoreapplication.h>
#include <qfontdatabase.h>
#include <qicon.h>
#include <qurl.h>
#include <qboxlayout.h>
#include <qbasictimer.h>
#include <QtCore/qabstractanimation.h>
#include <private/qgraphicsview_p.h>
QT_BEGIN_NAMESPACE
DEFINE_BOOL_CONFIG_OPTION(frameRateDebug, QML_SHOW_FRAMERATE)
class QDeclarativeViewDebugServer;
class FrameBreakAnimation : public QAbstractAnimation
{
public:
FrameBreakAnimation(QDeclarativeViewDebugServer *s)
: QAbstractAnimation((QObject*)s), server(s)
{
start();
}
virtual int duration() const { return -1; }
virtual void updateCurrentTime(int msecs);
private:
QDeclarativeViewDebugServer *server;
};
class QDeclarativeViewDebugServer : public QDeclarativeDebugService
{
public:
QDeclarativeViewDebugServer(QObject *parent = 0) : QDeclarativeDebugService(QLatin1String("CanvasFrameRate"), parent), breaks(0)
{
timer.start();
new FrameBreakAnimation(this);
}
void addTiming(int pe, int tbf)
{
if (!isEnabled())
return;
bool isFrameBreak = breaks > 1;
breaks = 0;
int e = timer.elapsed();
QByteArray data;
QDataStream ds(&data, QIODevice::WriteOnly);
ds << (int)pe << (int)tbf << (int)e
<< (bool)isFrameBreak;
sendMessage(data);
}
void frameBreak() { ++breaks; }
private:
QTime timer;
int breaks;
};
Q_GLOBAL_STATIC(QDeclarativeViewDebugServer, qfxViewDebugServer);
void FrameBreakAnimation::updateCurrentTime(int msecs)
{
Q_UNUSED(msecs);
server->frameBreak();
}
class QDeclarativeViewPrivate
{
public:
QDeclarativeViewPrivate(QDeclarativeView *view)
: q(view), root(0), component(0), resizeMode(QDeclarativeView::SizeViewToRootObject) {}
~QDeclarativeViewPrivate() { delete root; }
void execute();
QDeclarativeView *q;
QDeclarativeGuard<QGraphicsObject> root;
QDeclarativeGuard<QDeclarativeItem> qmlRoot;
QUrl source;
QDeclarativeEngine engine;
QDeclarativeComponent *component;
QBasicTimer resizetimer;
mutable QSize initialSize;
QDeclarativeView::ResizeMode resizeMode;
QTime frameTimer;
void init();
QGraphicsScene scene;
};
void QDeclarativeViewPrivate::execute()
{
delete root;
delete component;
component = new QDeclarativeComponent(&engine, source, q);
if (!component->isLoading()) {
q->continueExecute();
} else {
QObject::connect(component, SIGNAL(statusChanged(QDeclarativeComponent::Status)), q, SLOT(continueExecute()));
}
}
/*!
\class QDeclarativeView
\since 4.7
\brief The QDeclarativeView class provides a widget for displaying a Qt Declarative user interface.
Any QGraphicsObject or QDeclarativeItem
created via QML can be placed on a standard QGraphicsScene and viewed with a standard
QGraphicsView.
QDeclarativeView is a QGraphicsView subclass provided as a convenience for displaying QML
files, and connecting between QML and C++ Qt objects.
QDeclarativeView performs the following functions:
\list
\o Manages QDeclarativeComponent loading and object creation.
\o Initializes QGraphicsView for optimal performance with QML:
\list
\o QGraphicsView::setOptimizationFlags(QGraphicsView::DontSavePainterState);
\o QGraphicsView::setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
\o QGraphicsScene::setItemIndexMethod(QGraphicsScene::NoIndex);
\endlist
\o Initializes QGraphicsView for QML key handling:
\list
\o QGraphicsView::viewport()->setFocusPolicy(Qt::NoFocus);
\o QGraphicsView::setFocusPolicy(Qt::StrongFocus);
\o QGraphicsScene::setStickyFocus(true);
\endlist
\endlist
Typical usage:
\code
...
QDeclarativeView *view = new QDeclarativeView(this);
vbox->addWidget(view);
QUrl url(fileName);
view->setSource(url);
view->show();
\endcode
To receive errors related to loading and executing QML with QDeclarativeView,
you can connect to the statusChanged() signal and monitor for QDeclarativeView::Error.
The errors are available via QDeclarativeView::errors().
*/
/*! \fn void QDeclarativeView::sceneResized(QSize size)
This signal is emitted when the view is resized to \a size.
*/
/*! \fn void QDeclarativeView::statusChanged(QDeclarativeView::Status status)
This signal is emitted when the component's current \a status changes.
*/
/*!
\fn QDeclarativeView::QDeclarativeView(QWidget *parent)
Constructs a QDeclarativeView with the given \a parent.
*/
QDeclarativeView::QDeclarativeView(QWidget *parent)
: QGraphicsView(parent), d(new QDeclarativeViewPrivate(this))
{
setSizePolicy(QSizePolicy::Preferred,QSizePolicy::Preferred);
d->init();
}
/*!
\fn QDeclarativeView::QDeclarativeView(const QUrl &source, QWidget *parent)
Constructs a QDeclarativeView with the given QML \a source and \a parent.
*/
QDeclarativeView::QDeclarativeView(const QUrl &source, QWidget *parent)
: QGraphicsView(parent), d(new QDeclarativeViewPrivate(this))
{
setSizePolicy(QSizePolicy::Preferred,QSizePolicy::Preferred);
d->init();
setSource(source);
}
void QDeclarativeViewPrivate::init()
{
q->setScene(&scene);
q->setOptimizationFlags(QGraphicsView::DontSavePainterState);
q->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
q->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
q->setFrameStyle(0);
// These seem to give the best performance
q->setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
scene.setItemIndexMethod(QGraphicsScene::NoIndex);
q->viewport()->setFocusPolicy(Qt::NoFocus);
q->setFocusPolicy(Qt::StrongFocus);
scene.setStickyFocus(true); //### needed for correct focus handling
}
/*!
The destructor clears the view's \l {QGraphicsObject} {items} and
deletes the internal representation.
*/
QDeclarativeView::~QDeclarativeView()
{
delete d;
}
/*! \property QDeclarativeView::source
\brief The URL of the source of the QML component.
Changing this property causes the QML component to be reloaded.
*/
/*!
Sets the source to the \a url, loads the QML component and instantiates it.
Calling this methods multiple times with the same url will result
in the QML being reloaded.
*/
void QDeclarativeView::setSource(const QUrl& url)
{
d->source = url;
d->execute();
}
/*!
Returns the source URL, if set.
\sa setSource()
*/
QUrl QDeclarativeView::source() const
{
return d->source;
}
/*!
Returns a pointer to the QDeclarativeEngine used for instantiating
QML Components.
*/
QDeclarativeEngine* QDeclarativeView::engine()
{
return &d->engine;
}
/*!
This function returns the root of the context hierarchy. Each QML
component is instantiated in a QDeclarativeContext. QDeclarativeContext's are
essential for passing data to QML components. In QML, contexts are
arranged hierarchically and this hierarchy is managed by the
QDeclarativeEngine.
*/
QDeclarativeContext* QDeclarativeView::rootContext()
{
return d->engine.rootContext();
}
/*!
\enum QDeclarativeView::Status
Specifies the loading status of the QDeclarativeView.
\value Null This QDeclarativeView has no source set.
\value Ready This QDeclarativeView has loaded and created the QML component.
\value Loading This QDeclarativeView is loading network data.
\value Error An error has occured. Calling errorDescription() to retrieve a description.
*/
/*! \enum QDeclarativeView::ResizeMode
This enum specifies how to resize the view.
\value SizeViewToRootObject
\value SizeRootObjectToView
*/
/*!
\property QDeclarativeView::status
The component's current \l{QDeclarativeView::Status} {status}.
*/
QDeclarativeView::Status QDeclarativeView::status() const
{
if (!d->component)
return QDeclarativeView::Null;
return QDeclarativeView::Status(d->component->status());
}
/*!
Return the list of errors that occured during the last compile or create
operation. An empty list is returned if isError() is not set.
*/
QList<QDeclarativeError> QDeclarativeView::errors() const
{
if (d->component)
return d->component->errors();
return QList<QDeclarativeError>();
}
/*!
\property QDeclarativeView::resizeMode
\brief whether the view should resize the canvas contents
If this property is set to SizeViewToRootObject (the default), the view
resizes with the root item in the QML.
If this property is set to SizeRootObjectToView, the view will
automatically resize the root item.
Regardless of this property, the sizeHint of the view
is the initial size of the root item. Note though that
since QML may load dynamically, that size may change.
*/
void QDeclarativeView::setResizeMode(ResizeMode mode)
{
if (d->resizeMode == mode)
return;
d->resizeMode = mode;
if (d->qmlRoot) {
if (d->resizeMode == SizeRootObjectToView) {
d->qmlRoot->setWidth(width());
d->qmlRoot->setHeight(height());
} else {
d->qmlRoot->setWidth(d->initialSize.width());
d->qmlRoot->setHeight(d->initialSize.height());
}
}
}
QDeclarativeView::ResizeMode QDeclarativeView::resizeMode() const
{
return d->resizeMode;
}
/*!
\internal
*/
void QDeclarativeView::continueExecute()
{
disconnect(d->component, SIGNAL(statusChanged(QDeclarativeComponent::Status)), this, SLOT(continueExecute()));
if (d->component->isError()) {
QList<QDeclarativeError> errorList = d->component->errors();
foreach (const QDeclarativeError &error, errorList) {
qWarning() << error;
}
emit statusChanged(status());
return;
}
QObject *obj = d->component->create();
if(d->component->isError()) {
QList<QDeclarativeError> errorList = d->component->errors();
foreach (const QDeclarativeError &error, errorList) {
qWarning() << error;
}
emit statusChanged(status());
return;
}
setRootObject(obj);
emit statusChanged(status());
}
/*!
\internal
*/
void QDeclarativeView::setRootObject(QObject *obj)
{
if (QDeclarativeItem *item = qobject_cast<QDeclarativeItem *>(obj)) {
d->scene.addItem(item);
d->root = item;
d->qmlRoot = item;
connect(item, SIGNAL(widthChanged()), this, SLOT(sizeChanged()));
connect(item, SIGNAL(heightChanged()), this, SLOT(sizeChanged()));
if (d->initialSize.height() <= 0 && d->qmlRoot->width() > 0)
d->initialSize.setWidth(d->qmlRoot->width());
if (d->initialSize.height() <= 0 && d->qmlRoot->height() > 0)
d->initialSize.setHeight(d->qmlRoot->height());
resize(d->initialSize);
if (d->resizeMode == SizeRootObjectToView) {
d->qmlRoot->setWidth(width());
d->qmlRoot->setHeight(height());
} else {
QSize sz(d->qmlRoot->width(),d->qmlRoot->height());
emit sceneResized(sz);
resize(sz);
}
updateGeometry();
} else if (QGraphicsObject *item = qobject_cast<QGraphicsObject *>(obj)) {
d->scene.addItem(item);
qWarning() << "QDeclarativeView::resizeMode is not honored for components of type QGraphicsObject";
} else if (QWidget *wid = qobject_cast<QWidget *>(obj)) {
window()->setAttribute(Qt::WA_OpaquePaintEvent, false);
window()->setAttribute(Qt::WA_NoSystemBackground, false);
if (!layout()) {
setLayout(new QVBoxLayout);
layout()->setContentsMargins(0, 0, 0, 0);
} else if (layout()->count()) {
// Hide the QGraphicsView in GV mode.
QLayoutItem *item = layout()->itemAt(0);
if (item->widget())
item->widget()->hide();
}
layout()->addWidget(wid);
emit sceneResized(wid->size());
}
}
/*!
\internal
*/
void QDeclarativeView::sizeChanged()
{
// delay, so we catch both width and height changing.
d->resizetimer.start(0,this);
}
/*!
\internal
If the \l {QTimerEvent} {timer event} \a e is this
view's resize timer, sceneResized() is emitted.
*/
void QDeclarativeView::timerEvent(QTimerEvent* e)
{
if (!e || e->timerId() == d->resizetimer.timerId()) {
if (d->qmlRoot) {
QSize sz(d->qmlRoot->width(),d->qmlRoot->height());
emit sceneResized(sz);
//if (!d->resizable)
//resize(sz);
}
d->resizetimer.stop();
updateGeometry();
}
}
/*!
\internal
The size hint is the size of the root item.
*/
QSize QDeclarativeView::sizeHint() const
{
if (d->qmlRoot) {
if (d->initialSize.width() <= 0)
d->initialSize.setWidth(d->qmlRoot->width());
if (d->initialSize.height() <= 0)
d->initialSize.setHeight(d->qmlRoot->height());
}
return d->initialSize;
}
/*!
Returns the view's root \l {QGraphicsObject} {item}.
*/
QGraphicsObject *QDeclarativeView::rootObject() const
{
return d->root;
}
/*!
\internal
This function handles the \l {QResizeEvent} {resize event}
\a e.
*/
void QDeclarativeView::resizeEvent(QResizeEvent *e)
{
if (d->resizeMode == SizeRootObjectToView && d->qmlRoot) {
d->qmlRoot->setWidth(width());
d->qmlRoot->setHeight(height());
}
if (d->qmlRoot) {
setSceneRect(QRectF(0, 0, d->qmlRoot->width(), d->qmlRoot->height()));
} else if (d->root) {
setSceneRect(d->root->boundingRect());
} else {
setSceneRect(rect());
}
QGraphicsView::resizeEvent(e);
}
/*!
\internal
*/
void QDeclarativeView::paintEvent(QPaintEvent *event)
{
int time = 0;
if (frameRateDebug() || QDeclarativeViewDebugServer::isDebuggingEnabled())
time = d->frameTimer.restart();
QGraphicsView::paintEvent(event);
if (QDeclarativeViewDebugServer::isDebuggingEnabled())
qfxViewDebugServer()->addTiming(d->frameTimer.elapsed(), time);
if (frameRateDebug())
qDebug() << "paintEvent:" << d->frameTimer.elapsed() << "time since last frame:" << time;
}
QT_END_NAMESPACE
|