Introduce Qt.application.active property

Replaces qmlviewer's runtime.activeWindow property.

Task-number: QTBUG-13351
Reviewed-by: Martin Jones

1 files changed, 118 insertions, 0 deletions

diff --git a/src/declarative/util/qdeclarativeapplication.cpp b/src/declarative/util/qdeclarativeapplication.cpp
new file mode 100644
index 0000000..53d196f
--- /dev/null
+++ b/src/declarative/util/qdeclarativeapplication.cpp
@@ -0,0 +1,118 @@
+/****************************************************************************
+**
+** 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 "qdeclarativeapplication_p.h"
+#include <private/qobject_p.h>
+#include <QtGui/QApplication>
+
+class QDeclarativeApplicationPrivate : public QObjectPrivate
+{
+    Q_DECLARE_PUBLIC(QDeclarativeApplication)
+public:
+    QDeclarativeApplicationPrivate() : active(QApplication::activeWindow() != 0) {}
+    bool active;
+};
+
+/*!
+    \qmlclass Application QDeclarativeApplication
+    \since QtQuick 1.1
+    \ingroup qml-utility-elements
+    \brief The Application element provides access to global application
+    state properties shared by many QML components.
+
+    These properties include application activity property \c active.
+
+    \section1 Example Usage
+
+    The following example shows the simplest usage of the Application element.
+
+    \snippet doc/src/snippets/declarative/application.qml document
+
+*/
+
+QDeclarativeApplication::QDeclarativeApplication(QObject *parent) : QObject(*new QDeclarativeApplicationPrivate(), parent)
+{
+    if (qApp)
+        qApp->installEventFilter(this);
+}
+
+QDeclarativeApplication::~QDeclarativeApplication()
+{
+}
+
+/*!
+    \qmlproperty bool Application::active
+
+    This property indicates whether the application is the top-most and focused
+    application, and user is able to interact with the application. The property
+    is false when the application is on the background, device keylock or screen
+    saver is active, the screen backlight is turned off, or global system dialog
+    is being displayed on top of the application. It can be used for stopping and
+    pausing animations, timers, active processing of data to save device battery
+    and free device memory and processor load when the application is not active.
+    This property is readonly.
+
+*/
+bool QDeclarativeApplication::active() const
+{
+    Q_D(const QDeclarativeApplication);
+    return d->active;
+}
+
+bool QDeclarativeApplication::eventFilter(QObject *obj, QEvent *event)
+{
+    Q_UNUSED(obj)
+    Q_D(QDeclarativeApplication);
+    if (event->type() == QEvent::ApplicationActivate
+     || event->type() == QEvent::ApplicationDeactivate) {
+        bool active = d->active;
+        if (event->type() == QEvent::ApplicationActivate)
+            active  = true;
+        else if (event->type() == QEvent::ApplicationDeactivate)
+            active  = false;
+
+        if (d->active != active) {
+            d->active = active;
+            emit activeChanged();
+        }
+    }
+    return false;
+}