Add Screen attached object

Use this to get details of the screen such as size and current
orientation.

As well as adding its own example, this commit updates Calculator to
use Screen instead of Runtime for orientation.

Change-Id: I1b73d2ee22a92b1dee827de1bd893eebec9f5817
Reviewed-by: Michael Brasser <michael.brasser@nokia.com>

examples/declarative/calculator/calculator.qml

@@ -40,6 +40,7 @@
 ****************************************************************************/
 
 import QtQuick 2.0
+import QtQuick.Window 2.0
 import "Core"
 import "Core/calculator.js" as CalcEngine
 
@@ -61,7 +62,7 @@ Rectangle {
 
     Item {
         id: main
-        state: "orientation " + runtime.orientation
+        state: "orientation " + Screen.currentOrientation
 
         property bool landscapeWindow: window.width > window.height 
         property real baseWidth: landscapeWindow ? window.height : window.width
@@ -139,15 +140,15 @@ Rectangle {
 
         states: [
             State {
-                name: "orientation " + Orientation.Landscape
+                name: "orientation " + Qt.LandscapeOrientation
                 PropertyChanges { target: main; rotation: 90 + rotationDelta; width: main.baseHeight; height: main.baseWidth }
             },
             State {
-                name: "orientation " + Orientation.PortraitInverted
+                name: "orientation " + Qt.InvertedPortraitOrientation
                 PropertyChanges { target: main; rotation: 180 + rotationDelta; }
             },
             State {
-                name: "orientation " + Orientation.LandscapeInverted
+                name: "orientation " + Qt.InvertedLandscapeOrientation
                 PropertyChanges { target: main; rotation: 270 + rotationDelta; width: main.baseHeight; height: main.baseWidth }
             }
         ]

examples/declarative/window/screen/ruler.qml

@@ -0,0 +1,123 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+**     the names of its contributors may be used to endorse or promote
+**     products derived from this software without specific prior written
+**     permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.0
+import QtQuick.Window 2.0 as Window
+
+Item {
+    id: root
+    width: 800
+    height: dpi + dpcm
+    property real dpcm: Window.Screen.physicalDotsPerInch / 2.54
+    property real dpi: Window.Screen.physicalDotsPerInch
+    Item {
+        id: main
+        state: "orientation " + Window.Screen.currentOrientation
+
+        property bool landscapeWindow: Window.Screen.primaryOrientation == Qt.LandscapeOrientation
+        property real baseWidth: landscapeWindow ? root.height : root.width
+        property real baseHeight: landscapeWindow ? root.width : root.height
+        property real rotationDelta: landscapeWindow ? -90 : 0
+
+        rotation: rotationDelta
+        width: main.baseWidth
+        height: main.baseHeight
+        anchors.centerIn: parent
+
+        Repeater {
+            model: Math.ceil(main.width/ dpcm) + 1
+            delegate: Rectangle{
+                border.width: 1
+                color: "goldenrod"
+                width: dpcm
+                height: dpcm
+                x: dpcm * (index - 1)
+                Text {
+                    anchors.right: parent.right
+                    anchors.bottom: parent.bottom
+                    anchors.margins: 2
+                    font.pointSize: 6
+                    text: index + " cm"
+                }
+            }
+        }
+
+        Repeater {
+            model: Math.ceil(main.width / dpi) + 1
+            delegate: Rectangle{
+                border.width: 1
+                color: "goldenrod"
+                width: dpi
+                height: dpi
+                x: dpi * (index - 1)
+                y: dpcm
+                Text {
+                    anchors.right: parent.right
+                    anchors.bottom: parent.bottom
+                    anchors.margins: 2
+                    font.pointSize: 8
+                    text: index + " in"
+                }
+            }
+        }
+
+        states: [
+            State {
+                name: "orientation " + Qt.LandscapeOrientation
+                PropertyChanges { target: main; rotation: 90 + rotationDelta; width: main.baseHeight; height: main.baseWidth }
+            },
+            State {
+                name: "orientation " + Qt.InvertedPortraitOrientation
+                PropertyChanges { target: main; rotation: 180 + rotationDelta; }
+            },
+            State {
+                name: "orientation " + Qt.InvertedLandscapeOrientation
+                PropertyChanges { target: main; rotation: 270 + rotationDelta; width: main.baseHeight; height: main.baseWidth }
+            }
+        ]
+
+        transitions: Transition {
+            SequentialAnimation {
+                RotationAnimation { direction: RotationAnimation.Shortest; duration: 300; easing.type: Easing.InOutQuint  }
+                NumberAnimation { properties: "x,y,width,height"; duration: 300; easing.type: Easing.InOutQuint }
+            }
+        }
+    }
+}

src/quick/items/items.pri

@@ -67,6 +67,7 @@ HEADERS += \
     $$PWD/qquickmultipointtoucharea_p.h \
     $$PWD/qquickitemview_p.h \
     $$PWD/qquickitemview_p_p.h \
+    $$PWD/qquickscreen_p.h \
     $$PWD/qquickwindowmodule_p.h \
     $$PWD/qquickwindowmanager_p.h
 
@@ -116,6 +117,7 @@ SOURCES += \
     $$PWD/qquickmultipointtoucharea.cpp \
     $$PWD/qquickitemview.cpp \
     $$PWD/qquickwindowmodule.cpp \
+    $$PWD/qquickscreen.cpp \
     $$PWD/qquickwindowmanager.cpp
 
 SOURCES += \

src/quick/items/qquickitem.cpp

@@ -46,6 +46,7 @@
 #include "qquickcanvas_p.h"
 
 #include "qquickevents_p_p.h"
+#include "qquickscreen_p.h"
 
 #include <QtDeclarative/qdeclarativeengine.h>
 #include <QtDeclarative/qdeclarativecomponent.h>
@@ -2136,6 +2137,8 @@ void QQuickItemPrivate::initCanvas(InitializationState *state, QQuickCanvas *c)
 
     dirty(Canvas);
 
+    if (screenAttached)
+        screenAttached->canvasChanged(c);
     itemChange(QQuickItem::ItemSceneChange, c);
 }
 
@@ -2264,6 +2267,7 @@ QQuickItemPrivate::QQuickItemPrivate()
 
   itemNodeInstance(0), opacityNode(0), clipNode(0), rootNode(0), groupNode(0), paintNode(0)
   , beforePaintNode(0), effectRefCount(0), hideRefCount(0)
+  , screenAttached(0)
 {
 }
 

src/quick/items/qquickitem_p.h

@@ -83,6 +83,7 @@ QT_BEGIN_NAMESPACE
 class QNetworkReply;
 class QQuickItemKeyFilter;
 class QQuickLayoutMirroringAttached;
+class QQuickScreenAttached;
 
 class QQuickContents : public QQuickItemChangeListener
 {
@@ -445,6 +446,8 @@ class Q_QUICK_EXPORT QQuickItemPrivate : public QObjectPrivate
 
     virtual void mirrorChange() {}
 
+    QQuickScreenAttached *screenAttached;
+
     static qint64 consistentTime;
     static void setConsistentTime(qint64 t);
     static void start(QElapsedTimer &);

src/quick/items/qquickscreen.cpp

@@ -0,0 +1,176 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** 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.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qquickscreen_p.h"
+
+#include "qquickitem.h"
+#include "qquickitem_p.h"
+#include "qquickcanvas.h"
+
+#include <QScreen>
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \qmlclass Screen QQuickScreenAttached
+    \inqmlmodule QtQuick.Window 2
+    \brief The Screen attached object provides information about the Screen an Item is displayed on.
+
+    The Screen attached object is only valid inside Item or Item derived elements. Inside these elements
+    it refers to the screen that the element is currently being displayed on.
+*/
+
+/*!
+    \qmlattachedproperty int QtQuickWindow2::Screen::width
+    \readonly
+
+    This contains the width of the screen in pixels.
+*/
+/*!
+    \qmlattachedproperty int QtQuickWindow2::Screen::height
+    \readonly
+
+    This contains the height of the screen in pixels.
+*/
+/*!
+    \qmlattachedproperty Qt::ScreenOrientation QtQuickWindow2::Screen::primaryOrientation
+    \readonly
+
+    This contains the primary orientation of the screen. This can only change if the screen changes.
+*/
+/*!
+    \qmlattachedproperty Qt::ScreenOrientation QtQuickWindow2::Screen::currentOrientation
+    \readonly
+
+    This contains the current orientation of the screen.
+*/
+/*!
+    \qmlattachedmethod int QtQuickWindow2::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(0)
+{
+    m_attachee = qobject_cast<QQuickItem*>(attachee);
+
+    if (m_attachee) {
+        QQuickItemPrivate::get(m_attachee)->screenAttached = this;
+
+        if (m_attachee->canvas()) //It might not be assigned to a canvas yet
+            canvasChanged(m_attachee->canvas());
+    }
+}
+
+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::UnknownOrientation;
+    return m_screen->primaryOrientation();
+}
+
+Qt::ScreenOrientation QQuickScreenAttached::currentOrientation() const
+{
+    if (!m_screen)
+        return Qt::UnknownOrientation;
+    return m_screen->currentOrientation();
+}
+
+int QQuickScreenAttached::angleBetween(Qt::ScreenOrientation a, Qt::ScreenOrientation b)
+{
+    return QScreen::angleBetween(a,b);
+}
+
+void QQuickScreenAttached::canvasChanged(QQuickCanvas* c)//Called by QQuickItemPrivate::initCanvas
+{
+    QScreen* screen = c ? c->screen() : 0;
+    if (screen != m_screen) {
+        QScreen* oldScreen = m_screen;
+        m_screen = screen;
+
+        if (oldScreen) {
+            disconnect(oldScreen, SIGNAL(sizeChanged(QSize)),
+                    this, SIGNAL(widthChanged()));
+            disconnect(oldScreen, SIGNAL(sizeChanged(QSize)),
+                    this, SIGNAL(heightChanged()));
+            disconnect(oldScreen, SIGNAL(currentOrientationChanged(Qt::ScreenOrientation)),
+                    this, SIGNAL(currentOrientationChanged()));
+        }
+
+        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->currentOrientation() != oldScreen->currentOrientation())
+            emit currentOrientationChanged();
+        if (!oldScreen || screen->primaryOrientation() != oldScreen->primaryOrientation())
+            emit primaryOrientationChanged();
+
+
+        connect(screen, SIGNAL(sizeChanged(QSize)),
+                this, SIGNAL(widthChanged()));
+        connect(screen, SIGNAL(sizeChanged(QSize)),
+                this, SIGNAL(heightChanged()));
+        connect(screen, SIGNAL(currentOrientationChanged(Qt::ScreenOrientation)),
+                this, SIGNAL(currentOrientationChanged()));
+    }
+}
+
+QT_END_NAMESPACE