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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** 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, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 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 the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qquickscreen_p.h"
#include "qquickitem.h"
#include "qquickitem_p.h"
#include "qquickwindow.h"
#include <QScreen>
QT_BEGIN_NAMESPACE
/*!
\qmltype Screen
\instantiates QQuickScreenAttached
\inqmlmodule QtQuick.Window 2
\ingroup qtquick-visual-utility
\brief The Screen attached object provides information about the Screen an Item or Window is displayed on.
The Screen attached object is valid inside Item or Item derived types,
after component completion. Inside these items it refers to the screen that
the item is currently being displayed on.
The attached object is also valid inside Window or Window derived types,
after component completion. In that case it refers to the screen where the
Window was created. It is generally better to access the Screen from the
relevant Item instead, because on a multi-screen desktop computer, the user
can drag a Window into a position where it spans across multiple screens.
In that case some Items will be on one screen, and others on a different
screen.
To use this type, you will need to import the module with the following line:
\code
import QtQuick.Window 2.0
\endcode
It is a separate import in order to allow you to have a QML environment
without access to window system features.
Note that the Screen type is not valid at Component.onCompleted, because
the Item or Window has not been displayed on a screen by this time.
*/
/*!
\qmlattachedproperty int QtQuick.Window2::Screen::width
\readonly
This contains the width of the screen in pixels.
*/
/*!
\qmlattachedproperty int QtQuick.Window2::Screen::height
\readonly
This contains the height of the screen in pixels.
*/
/*!
\qmlattachedproperty Qt::ScreenOrientation QtQuick.Window2::Screen::primaryOrientation
\readonly
This contains the primary orientation of the screen. If the
screen's height is greater than its width, then the orientation is
Qt.PortraitOrientation; otherwise it is Qt.LandscapeOrientation.
If you are designing an application which changes its layout depending on
device orientation, you probably want to use primaryOrientation to
determine the layout. That is because on a desktop computer, you can expect
primaryOrientation to change when the user rotates the screen via the
operating system's control panel, even if the computer does not contain an
accelerometer. Likewise on most handheld computers which do have
accelerometers, the operating system will rotate the whole screen
automatically, so again you will see the primaryOrientation change.
*/
/*!
\qmlattachedproperty Qt::ScreenOrientation QtQuick.Window2::Screen::orientation
\readonly
This contains the current orientation of the screen, from the accelerometer
(if any). On a desktop computer, this value typically does not change.
If primaryOrientation == orientation, it means that the screen
automatically rotates all content which is displayed, depending on how you
hold it. But if orientation changes while primaryOrientation does NOT
change, then probably you are using a device which does not rotate its own
display. In that case you may need to use \l Item.rotation or
\l Item.transform to rotate your content.
*/
/*!
\qmlattachedmethod int QtQuick.Window2::Screen::angleBetween(Qt::ScreenOrientation a, Qt::ScreenOrientation b)
Returns the rotation angle, in degrees, between the two specified angles.
*/
QQuickScreenAttached::QQuickScreenAttached(QObject* attachee)
: QObject(attachee)
, m_screen(NULL)
, m_window(NULL)
{
m_attachee = qobject_cast<QQuickItem*>(attachee);
if (m_attachee) {
QQuickItemPrivate::get(m_attachee)->extra.value().screenAttached = this;
if (m_attachee->window()) //It might not be assigned to a window yet
windowChanged(m_attachee->window());
} else {
QQuickWindow *window = qobject_cast<QQuickWindow*>(attachee);
if (window)
windowChanged(window);
}
}
int QQuickScreenAttached::width() const
{
if (!m_screen)
return 0;
return m_screen->size().width();
}
int QQuickScreenAttached::height() const
{
if (!m_screen)
return 0;
return m_screen->size().height();
}
Qt::ScreenOrientation QQuickScreenAttached::primaryOrientation() const
{
if (!m_screen)
return Qt::PrimaryOrientation;
return m_screen->primaryOrientation();
}
Qt::ScreenOrientation QQuickScreenAttached::orientation() const
{
if (!m_screen)
return Qt::PrimaryOrientation;
return m_screen->orientation();
}
int QQuickScreenAttached::angleBetween(int a, int b)
{
if (!m_screen)
return Qt::PrimaryOrientation;
return m_screen->angleBetween((Qt::ScreenOrientation)a,(Qt::ScreenOrientation)b);
}
void QQuickScreenAttached::windowChanged(QQuickWindow* c)
{
if (m_window)
disconnect(m_window, SIGNAL(screenChanged(QScreen*)), this, SLOT(screenChanged(QScreen*)));
m_window = c;
screenChanged(c ? c->screen() : NULL);
if (c)
connect(c, SIGNAL(screenChanged(QScreen*)), this, SLOT(screenChanged(QScreen*)));
}
void QQuickScreenAttached::screenChanged(QScreen *screen)
{
//qDebug() << "QQuickScreenAttached::screenChanged" << (screen ? screen->name() : QString::fromLatin1("null"));
if (screen != m_screen) {
QScreen* oldScreen = m_screen;
m_screen = screen;
if (oldScreen)
oldScreen->disconnect(this);
if (!screen)
return; //Don't bother emitting signals, because the new values are garbage anyways
if (!oldScreen || screen->size() != oldScreen->size()) {
emit widthChanged();
emit heightChanged();
}
if (!oldScreen || screen->orientation() != oldScreen->orientation())
emit orientationChanged();
if (!oldScreen || screen->primaryOrientation() != oldScreen->primaryOrientation())
emit primaryOrientationChanged();
connect(screen, SIGNAL(geometryChanged(QRect)),
this, SIGNAL(widthChanged()));
connect(screen, SIGNAL(geometryChanged(QRect)),
this, SIGNAL(heightChanged()));
connect(screen, SIGNAL(orientationChanged(Qt::ScreenOrientation)),
this, SIGNAL(orientationChanged()));
connect(screen, SIGNAL(primaryOrientationChanged(Qt::ScreenOrientation)),
this, SIGNAL(primaryOrientationChanged()));
}
}
QT_END_NAMESPACE
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