Doc: Gesture API documentation review and improvements.

Reviewed-by: Trust Me

10 files changed, 95 insertions, 1884 deletions

diff --git a/doc/src/frameworks-technologies/gestures.qdoc b/doc/src/frameworks-technologies/gestures.qdoc
index 158a273..e5947a2 100644
--- a/doc/src/frameworks-technologies/gestures.qdoc
+++ b/doc/src/frameworks-technologies/gestures.qdoc
@@ -59,176 +59,115 @@
 
     \section1 Overview
 
-    QGesture is the central class in Qt's gesture framework, providing
-    the API used by classes that represent specific gestures, such as
-    QPanGesture, QPinchGesture, and QSwipeGesture. These standard
-    classes are ready to use, and each exposes functions and
-    properties that give gesture-specific information about the user's
-    input. This is described in the \l{Using Standard Gestures With Widgets}
-    section.
-
-    QGesture is also designed to be subclassed and extended so that
-    support for new gestures can be implemented by developers. Adding
-    support for a new gesture involves implementing code to recognize
-    the gesture from incoming events. This is described in the
+    QGesture is the central class in Qt's gesture framework, providing a container
+    for information about gestures performed by the user, such as panning, pinching
+    and swiping. QGesture exposes properties that give general information that is
+    common to all gestures, and these can be extended to provide additional
+    gesture-specific information.
+
+    Developers can also implement new gestures by subclassing and extending the
+    QGestureRecognizer class. Adding support for a new gesture involves implementing
+    code to recognize the gesture from input events. This is described in the
     \l{Creating Your Own Gesture Recognizer} section.
 
     \section1 Using Standard Gestures with Widgets
 
-    Gesture objects are applied directly to widgets and other controls that accept
-    user input \mdash these are the \e{target objects}. When a gesture object is
-    constructed, the target object is typically passed to the constructor, though
-    it can also be passed as the argument to the \l{QGesture::}{setGestureTarget()}
-    function.
+    Gestures can be enabled for instances of QWidget and QGraphicsObject subclasses.
+    An object that accepts gesture input is referred to as a \e{target object}.
 
-    \snippet examples/gestures/imageviewer/imagewidget.cpp construct swipe gesture
+    To enable a gesture for a target object, call its QWidget::grabGesture() or
+    QGraphicsObject::grabGesture() function with an argument describing the
+    required gesture type. The standard types are defined by the Qt::GestureType
+    enum and include many commonly used gestures.
+
+    \snippet examples/gestures/imageviewer/imagewidget.cpp enable gestures
 
     In the above code, the gesture is set up in the constructor of the target object
-    itself, so the argument to the QSwipeGesture constructor is \e this.
+    itself.
+
+    When the user performs a gesture, QGestureEvent events will be delivered to the
+    target object, and these can be handled by reimplementing the QWidget::event()
+    handler function for widgets or QGraphicsItem::sceneEvent() for graphics objects.
+
+    For convenience, the \l{Image Gestures Example} reimplements the general
+    \l{QWidget::}{event()} handler function and delegates gesture events to a
+    specialized gestureEvent() function:
 
-    When the user performs a gesture, various signals may be emitted by the
-    gesture object. To monitor the user's actions, you need to connect signals
-    from the gesture object to slots in your code.
+    \snippet examples/gestures/imageviewer/imagewidget.cpp event handler
 
-    \snippet examples/gestures/imageviewer/imagewidget.cpp connect swipe gesture
+    The gesture events delivered to the target object can be examined individually
+    and dealt with appropriately:
 
-    Here, the \l{QGesture::}{triggered()} signal is used to inform the application
-    that a gesture was used. More precise monitoring of a gesture can be implemented
-    by connecting its \l{QGesture::}{started()}, \l{QGesture::}{canceled()} and
-    \l{QGesture::}{finished()} signals to slots.
+    \snippet examples/gestures/imageviewer/imagewidget.cpp gesture event handler
 
-    Responding to a signal is simply a matter of obtaining the gesture that sent
-    it and examining the information it contains.
+    Responding to a gesture is simply a matter of obtaining the QGesture object
+    delivered in the QGestureEvent sent to the target object and examining the
+    information it contains.
 
-    \snippet examples/gestures/imageviewer/imagewidget.cpp swipe slot start
+    \snippet examples/gestures/imageviewer/imagewidget.cpp swipe function
 
     Here, we examine the direction in which the user swiped the widget and modify
     its contents accordingly.
 
-    \section1 Using Standard Gestures with Graphics Items
-
-    The approach used for applying gestures to widgets can also be used with
-    graphics items. However, instead of passing a target object to the
-    gesture object's constructor, you set a target graphics item with the
-    \l{QGesture::}{setGraphicsItem()} function.
 
     \section1 Creating Your Own Gesture Recognizer
 
-    QGesture is a base class for a user defined gesture recognizer class. In
-    order to implement the recognizer you will need to subclass the
-    QGesture class and implement the pure virtual function
-    \l{QGesture::}{filterEvent()} to filter out events that are not relevant
-    to your gesture.
-
-    Once you have implemented the \l{QGesture::}{filterEvent()} function to
-    make your own recognizer you can process events. A sequence of events may,
-    according to your own rules, represent a gesture. The events can be singly
-    passed to the recognizer via the \l{QGesture::}{filterEvent()} function
-    or as a stream of events by specifying a parent source of events. The events
-    can be from any source and could result in any action as defined by the user.
-    The source and action need not be graphical, though that would be the most
-    likely scenario. To find how to connect a source of events to automatically
-    feed into the recognizer see the QGesture documentation.
-
-    Recognizers based on QGesture can emit any of the following signals to
-    indicate their progress in recognizing user input:
-
-    \list
-    \o \l{QGesture::}{triggered()} is emitted when a gesture is recognized.
-    \o \l{QGesture::}{started()} indicates that the gesture object has started
-    to recognize user input.
-    \o \l{QGesture::}{finished()} is emitted when the gesture object has
-    recognized the user input as a gesture, and finished handling it.
-    \o \l{QGesture::}{canceled()} indicates that the gesture was canceled,
-    either by the user or by the application.
-    \endlist
-
-    These signals are emitted when the state changes with the call to
-    \l{QGesture::}{updateState()}, more than one signal may
-    be emitted when a change of state occurs. There are four GestureStates
-
-    \table
-    \header \o New State            \o Description              \o QGesture Actions on Entering this State
-    \row    \o Qt::NoGesture        \o Initial value            \o emit \l {QGesture::}{canceled()}
-    \row    \o Qt::GestureStarted   \o A continuous gesture has started \o emit \l{QGesture::}{started()} and emit \l{QGesture::}{triggered()}
-    \row    \o Qt::GestureUpdated   \o A gesture continues      \o emit \l{QGesture::}{triggered()}
-    \row    \o Qt::GestureFinished  \o A gesture has finished.  \o emit \l{QGesture::}{finished()}
-    \endtable
-
-    \note \l{QGesture::started()}{started()} can be emitted if entering any
-    state greater than NoGesture if NoGesture was the previous state. This
-    means that your state machine does not need to explicitly use the
-    Qt::GestureStarted state, you can simply proceed from NoGesture to
-    Qt::GestureUpdated to emit a \l{QGesture::started()}{started()} signal
-    and a \l{QGesture::triggered()}{triggered()} signal.
-
-    You may use some or all of these states when implementing the pure
-    virtual function \l{QGesture::filterEvent()}{filterEvent()}.
-    \l{QGesture::filterEvent()}{filterEvent()} will usually implement a
-    state machine using the GestureState enums, but the details of which
-    states are used is up to the developer.
-
-    You may also need to reimplement the virtual function \l{QGesture::reset()}{reset()}
-    if internal data or objects need to be re-initialized. The function must
-    conclude with a call to \l{QGesture::updateState()}{updateState()} to
-    change the current state to Qt::NoGesture.
-
-    \section1 The ImageViewer Example
-
-    To illustrate how to use QGesture we will look at the ImageViewer
-    example. This example uses QPanGesture, a standard gesture, and an
-    implementation of TapAndHoldGesture. Note that TapAndHoldGesture is
-    platform-dependent.
-
-    \snippet doc/src/snippets/gestures/imageviewer/tapandholdgesture.cpp tapandhold-reset
-
-    In ImageViewer we see that the ImageWidget class uses two gestures:
-    \l QPanGesture and TapAndHoldGesture. The
-    QPanGesture is a standard gesture which is part of Qt.
-    TapAndHoldGesture is defined and implemented as part of the example.
-    The ImageWidget listens for signals from the gestures, but is not
-    interested in the \l{QGesture::started()}{started()} signal.
-
-    \snippet doc/src/snippets/gestures/imageviewer/imagewidget.h imagewidget-slots
-
-    TapAndHoldGesture uses QTouchEvent events and mouse events to detect
-    start, update and end events that can be mapped onto the GestureState
-    changes. The implementation in this case uses a timer as well. If the
-    timeout event occurs a given number of times after the start of the gesture
-    then the gesture is considered to have finished whether or not the
-    appropriate touch or mouse event has occurred. Also if a large jump in
-    the position of the event occurs, as calculated by the \l {QPoint::manhattanLength()}{manhattanLength()}
-    call, then the gesture is canceled by calling \l{QGesture::reset()}{reset()}
-    which tidies up  and uses \l{QGesture::updateState()}{updateState()} to
-    change state to NoGesture which will result in the \l{QGesture::canceled()}{canceled()}
-    signal being emitted by the recognizer.
-
-    ImageWidget handles the signals by connecting the slots to the signals,
-    although \c canceled() is not connected here.
-
-    \snippet doc/src/snippets/gestures/imageviewer/imagewidget.cpp  imagewidget-connect
-
-    These functions in turn will have to be aware of which gesture
-    object was the source of the signal since we have more than one source
-    per slot. This is easily done by using the QObject::sender() function
-    as shown here
-
-    \snippet doc/src/snippets/gestures/imageviewer/imagewidget.cpp imagewidget-triggered-1
-
-    As \l{QGesture::triggered()}{triggered()} signals are handled by
-    gestureTriggered() there may be position updates invoking calls to,
-    for example, goNextImage(), this will cause a change in the image
-    handling logic of ImageWidget and a call to updateImage() to display
-    the changed state.
-
-    Following the logic of how the QEvent is processed we can summmarize
-    it as follows:
-    \list
-        \o filterEvent() becomes the event filter of the parent ImageWidget object
-        for a QPanGesture object and a TapAndHoldGesture object.
-        \o filterEvent() then calls updateState() to change states
-        \o updateState() emits the appropriate signal(s) for the state change.
-        \o The signals are caught by the defined slots in ImageWidget
-        \o The widget logic changes and an update() results in a paint event.
-    \endlist
+    Adding support for a new gesture involves creating and registering a new gesture
+    recognizer. Depending on the recognition process for the gesture, it may also
+    involve creating a new gesture object.
+
+    To create a new recognizer, you need to subclass QGestureRecognizer to create a
+    custom recognizer class. There is one virtual function that you must reimplement
+    and two others that can be reimplemented as required.
+
+    \section2 Filtering Input Events
+
+    The \l{QGestureRecognizer::}{filterEvent()} function must be reimplemented.
+    This function handles and filters the incoming input events for the target objects
+    and determines whether or not they correspond to the gesture the recognizer is
+    looking for.
+
+    Although the logic for gesture recognition is implemented in this function,
+    possibly using a state machine based on the Qt::GestureState enums, you can store
+    persistent information about the state of the recognition process in the QGesture
+    object supplied.
+
+    Your \l{QGestureRecognizer::}{filterEvent()} function must return a value of
+    Qt::GestureState that indicates the state of recognition for a given gesture and
+    target object. This determines whether or not a gesture event will be delivered
+    to a target object.
+
+    \section2 Custom Gestures
+
+    If you choose to represent a gesture by a custom QGesture subclass, you will need to
+    reimplement the \l{QGestureRecognizer::}{createGesture()} function to construct
+    instances of your gesture class instead of standard QGesture instances. Alternatively,
+    you may want to use standard QGesture instances, but add additional dynamic properties
+    to them to express specific details of the gesture you want to handle.
+
+    \section2 Resetting Gestures
+
+    If you use custom gesture objects that need to be reset or otherwise specially
+    handled when a gesture is canceled, you need to reimplement the
+    \l{QGestureRecognizer::}{reset()} function to perform these special tasks.
+
+    Note that QGesture objects are only created once for each combination of target object
+    and gesture type, and they are reused every time the user attempts to perform the
+    same gesture type on the target object. As a result, it can be useful to reimplement
+    the \l{QGestureRecognizer::}{reset()} function to clean up after each previous attempt
+    at recognizing a gesture.
+
+
+    \section1 Using a New Gesture Recognizer
+
+    To use a gesture recognizer, construct an instance of your QGestureRecognizer
+    subclass, and register it with the application with
+    QApplication::registerGestureRecognizer(). A recognizer for a given type of
+    gesture can be removed with QApplication::unregisterGestureRecognizer().
+
+
+    \section1 Further Reading
+
+    The \l{Image Gestures Example} shows how to enable gestures for a widget in
+    a simple image viewer application.
 */
diff --git a/doc/src/getting-started/examples.qdoc b/doc/src/getting-started/examples.qdoc
index d6ade22..05940e4 100644
--- a/doc/src/getting-started/examples.qdoc
+++ b/doc/src/getting-started/examples.qdoc
@@ -1072,18 +1072,17 @@
 /*!
     \page examples-gestures.html
     \title Gestures Examples
-    
+
     \previouspage Animation Framework Examples
     \contentspage Qt Examples
     \nextpage D-Bus Examples
 
     The API of the gesture framework is not yet finalized and
     still subject to change.
-\omit
+
     \list
-    \o \l{widgets/imageviewer}{Image Viewer}
+    \o \l{gestures/imagegestures}{Image Gestures}
     \endlist
-\endomit
 */
 
 /*!
diff --git a/doc/src/snippets/gestures/imageviewer/imagewidget.cpp b/doc/src/snippets/gestures/imageviewer/imagewidget.cpp
deleted file mode 100644
index 409db2e..0000000
--- a/doc/src/snippets/gestures/imageviewer/imagewidget.cpp
+++ /dev/null
@@ -1,364 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2009 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.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** 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 "imagewidget.h"
-
-#include <QtGui>
-
-ImageWidget::ImageWidget(QWidget *parent)
-    : QWidget(parent)
-{
-    setAttribute(Qt::WA_AcceptTouchEvents);
-    setAttribute(Qt::WA_PaintOnScreen);
-    setAttribute(Qt::WA_OpaquePaintEvent);
-    setAttribute(Qt::WA_NoSystemBackground);
-
-    setObjectName("ImageWidget");
-
-    setMinimumSize(QSize(100,100));
-
-    position = 0;
-    zoomed = rotated = false;
-
-    zoomedIn = false;
-    horizontalOffset = 0;
-    verticalOffset = 0;
-
-//! [imagewidget-connect]
-    panGesture = new QPanGesture(this);
-    connect(panGesture, SIGNAL(triggered()), this, SLOT(gestureTriggered()));
-
-    tapAndHoldGesture = new TapAndHoldGesture(this);
-    connect(tapAndHoldGesture, SIGNAL(triggered()), this, SLOT(gestureTriggered()));
-    connect(tapAndHoldGesture, SIGNAL(finished()), this, SLOT(gestureFinished()));
-//! [imagewidget-connect]
-}
-
-void ImageWidget::paintEvent(QPaintEvent*)
-{
-    QPainter p(this);
-    if (currentImage.isNull()) {
-        p.fillRect(geometry(), Qt::white);
-        return;
-    }
-    int hoffset = 0;
-    int voffset = 0;
-    const int w = pixmap.width();
-    const int h = pixmap.height();
-    p.save();
-    if (zoomedIn) {
-        hoffset = horizontalOffset;
-        voffset = verticalOffset;
-        if (horizontalOffset > 0)
-            p.fillRect(0, 0, horizontalOffset, height(), Qt::white);
-        if (verticalOffset > 0)
-            p.fillRect(0, 0, width(), verticalOffset, Qt::white);
-    }
-    p.drawPixmap(hoffset, voffset, pixmap);
-    if (hoffset + w < width())
-        p.fillRect(hoffset + w, 0, width() - w - hoffset, height(), Qt::white);
-    if (voffset + h < height())
-        p.fillRect(0, voffset + h, width(), height() - h - voffset, Qt::white);
-
-    // paint touch feedback
-    if (touchFeedback.tapped || touchFeedback.doubleTapped) {
-        p.setPen(QPen(Qt::gray, 2));
-        p.drawEllipse(touchFeedback.position, 5, 5);
-        if (touchFeedback.doubleTapped) {
-            p.setPen(QPen(Qt::darkGray, 2, Qt::DotLine));
-            p.drawEllipse(touchFeedback.position, 15, 15);
-        } else if (touchFeedback.tapAndHoldState != 0) {
-            QPoint pts[8] = {
-                touchFeedback.position + QPoint(  0, -15),
-                touchFeedback.position + QPoint( 10, -10),
-                touchFeedback.position + QPoint( 15,   0),
-                touchFeedback.position + QPoint( 10,  10),
-                touchFeedback.position + QPoint(  0,  15),
-                touchFeedback.position + QPoint(-10,  10),
-                touchFeedback.position + QPoint(-15,   0)
-            };
-            for (int i = 0; i < touchFeedback.tapAndHoldState/5; ++i)
-                p.drawEllipse(pts[i], 3, 3);
-        }
-    } else if (touchFeedback.sliding) {
-        p.setPen(QPen(Qt::red, 3));
-        QPoint endPos = QPoint(touchFeedback.position.x(), touchFeedback.slidingStartPosition.y());
-        p.drawLine(touchFeedback.slidingStartPosition, endPos);
-        int dx = 10;
-        if (touchFeedback.slidingStartPosition.x() < endPos.x())
-            dx = -1*dx;
-        p.drawLine(endPos, endPos + QPoint(dx, 5));
-        p.drawLine(endPos, endPos + QPoint(dx, -5));
-    }
-
-    for (int i = 0; i < TouchFeedback::MaximumNumberOfTouches; ++i) {
-        if (touchFeedback.touches[i].isNull())
-            break;
-        p.drawEllipse(touchFeedback.touches[i], 10, 10);
-    }
-    p.restore();
-}
-
-void ImageWidget::mousePressEvent(QMouseEvent *event)
-{
-    touchFeedback.tapped = true;
-    touchFeedback.position = event->pos();
-}
-
-void ImageWidget::mouseDoubleClickEvent(QMouseEvent *event)
-{
-    touchFeedback.doubleTapped = true;
-    const QPoint p = event->pos();
-    touchFeedback.position = p;
-    horizontalOffset = p.x() - currentImage.width()*1.0*p.x()/width();
-    verticalOffset = p.y() - currentImage.height()*1.0*p.y()/height();
-    setZoomedIn(!zoomedIn);
-    zoomed = rotated = false;
-    updateImage();
-
-    feedbackFadeOutTimer.start(500, this);
-}
-
-//! [imagewidget-triggered-1]
-void ImageWidget::gestureTriggered()
-{
-    if (sender() == panGesture) {
-//! [imagewidget-triggered-1]
-        touchFeedback.tapped = false;
-        touchFeedback.doubleTapped = false;
-        QPanGesture *pg = qobject_cast<QPanGesture*>(sender());
-        if (zoomedIn) {
-#ifndef QT_NO_CURSOR
-            switch (pg->state()) {
-                case Qt::GestureStarted:
-                case Qt::GestureUpdated:
-                    setCursor(Qt::SizeAllCursor);
-                    break;
-                default:
-                    setCursor(Qt::ArrowCursor);
-            }
-#endif
-            horizontalOffset += pg->lastOffset().width();
-            verticalOffset += pg->lastOffset().height();
-        } else {
-            // only slide gesture should be accepted
-            if (pg->state() == Qt::GestureFinished) {
-                touchFeedback.sliding = false;
-                zoomed = rotated = false;
-                if (pg->totalOffset().width() > 0)
-                    goNextImage();
-                else
-                    goPrevImage();
-                updateImage();
-            }
-        }
-        update();
-        feedbackFadeOutTimer.start(500, this);
-    } else if (sender() == tapAndHoldGesture) {
-        if (tapAndHoldGesture->state() == Qt::GestureFinished) {
-            qDebug() << "tap and hold detected";
-            touchFeedback.reset();
-            update();
-
-            QMenu menu;
-            menu.addAction("Action 1");
-            menu.addAction("Action 2");
-            menu.addAction("Action 3");
-            menu.exec(mapToGlobal(tapAndHoldGesture->pos()));
-        } else {
-            ++touchFeedback.tapAndHoldState;
-            update();
-        }
-        feedbackFadeOutTimer.start(500, this);
-    }
-}
-
-void ImageWidget::gestureFinished()
-{
-    qDebug() << "gesture finished" << sender();
-}
-
-void ImageWidget::gestureCancelled()
-{
-    qDebug() << "gesture cancelled" << sender();
-}
-
-void ImageWidget::resizeEvent(QResizeEvent*)
-{
-    updateImage();
-}
-
-void ImageWidget::updateImage()
-{
-    // should use qtconcurrent here?
-    transformation = QTransform();
-    if (zoomedIn) {
-    } else {
-        if (currentImage.isNull())
-            return;
-        if (zoomed) {
-            transformation = transformation.scale(zoom, zoom);
-        } else {
-            double xscale = (double)width()/currentImage.width();
-            double yscale = (double)height()/currentImage.height();
-            if (xscale < yscale)
-                yscale = xscale;
-            else
-                xscale = yscale;
-            transformation = transformation.scale(xscale, yscale);
-        }
-        if (rotated)
-            transformation = transformation.rotate(angle);
-    }
-    pixmap = QPixmap::fromImage(currentImage).transformed(transformation);
-    update();
-}
-
-void ImageWidget::openDirectory(const QString &path)
-{
-    this->path = path;
-    QDir dir(path);
-    QStringList nameFilters;
-    nameFilters << "*.jpg" << "*.png";
-    files = dir.entryList(nameFilters, QDir::Files|QDir::Readable, QDir::Name);
-
-    position = 0;
-    goToImage(0);
-    updateImage();
-}
-
-QImage ImageWidget::loadImage(const QString &fileName)
-{
-    QImageReader reader(fileName);
-    if (!reader.canRead()) {
-        qDebug() << fileName << ": can't load image";
-        return QImage();
-    }
-    QImage image;
-    if (!reader.read(&image)) {
-        qDebug() << fileName << ": corrupted image";
-        return QImage();
-    }
-    return image;
-}
-
-void ImageWidget::setZoomedIn(bool zoomed)
-{
-    zoomedIn = zoomed;
-}
-
-void ImageWidget::goNextImage()
-{
-    if (files.isEmpty())
-        return;
-    if (position < files.size()-1) {
-        ++position;
-        prevImage = currentImage;
-        currentImage = nextImage;
-        if (position+1 < files.size())
-            nextImage = loadImage(path+QLatin1String("/")+files.at(position+1));
-        else
-            nextImage = QImage();
-    }
-    setZoomedIn(false);
-    updateImage();
-}
-
-void ImageWidget::goPrevImage()
-{
-    if (files.isEmpty())
-        return;
-    if (position > 0) {
-        --position;
-        nextImage = currentImage;
-        currentImage = prevImage;
-        if (position > 0)
-            prevImage = loadImage(path+QLatin1String("/")+files.at(position-1));
-        else
-            prevImage = QImage();
-    }
-    setZoomedIn(false);
-    updateImage();
-}
-
-void ImageWidget::goToImage(int index)
-{
-    if (files.isEmpty())
-        return;
-    if (index < 0 || index >= files.size()) {
-        qDebug() << "goToImage: invalid index: " << index;
-        return;
-    }
-    if (index == position+1) {
-        goNextImage();
-        return;
-    }
-    if (position > 0 && index == position-1) {
-        goPrevImage();
-        return;
-    }
-    position = index;
-    pixmap = QPixmap();
-    if (index > 0)
-        prevImage = loadImage(path+QLatin1String("/")+files.at(position-1));
-    else
-        prevImage = QImage();
-    currentImage = loadImage(path+QLatin1String("/")+files.at(position));
-    if (position+1 < files.size())
-        nextImage = loadImage(path+QLatin1String("/")+files.at(position+1));
-    else
-        nextImage = QImage();
-    setZoomedIn(false);
-    updateImage();
-}
-
-void ImageWidget::timerEvent(QTimerEvent *event)
-{
-    if (event->timerId() == touchFeedback.tapTimer.timerId()) {
-        touchFeedback.tapTimer.stop();
-    } else if (event->timerId() == feedbackFadeOutTimer.timerId()) {
-        feedbackFadeOutTimer.stop();
-        touchFeedback.reset();
-    }
-    update();
-}
-
-#include "moc_imagewidget.cpp"
diff --git a/doc/src/snippets/gestures/imageviewer/imagewidget.h b/doc/src/snippets/gestures/imageviewer/imagewidget.h
deleted file mode 100644
index 5553093..0000000
--- a/doc/src/snippets/gestures/imageviewer/imagewidget.h
+++ /dev/null
@@ -1,137 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2009 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.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** 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.
-**
-**
-**
-**
-**
-**
-**
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef IMAGEWIDGET_H
-#define IMAGEWIDGET_H
-
-#include <QWidget>
-#include <QImage>
-#include <QPixmap>
-
-#include <QtGui>
-
-#include "tapandholdgesture.h"
-
-class ImageWidget : public QWidget
-{
-    Q_OBJECT
-
-public:
-    ImageWidget(QWidget *parent = 0);
-
-    void openDirectory(const QString &path);
-
-protected:
-    void paintEvent(QPaintEvent*);
-    void resizeEvent(QResizeEvent*);
-    void timerEvent(QTimerEvent*);
-    void mousePressEvent(QMouseEvent*);
-    void mouseDoubleClickEvent(QMouseEvent*);
-
-//! [imagewidget-slots]
-private slots:
-    void gestureTriggered();
-    void gestureFinished();
-    void gestureCancelled();
-//! [imagewidget-slots]
-
-private:
-    void updateImage();
-    QImage loadImage(const QString &fileName);
-    void loadImage();
-    void setZoomedIn(bool zoomed);
-    void goNextImage();
-    void goPrevImage();
-    void goToImage(int index);
-
-    QPanGesture *panGesture;
-    TapAndHoldGesture *tapAndHoldGesture;
-
-    QString path;
-    QStringList files;
-    int position;
-
-    QImage prevImage, nextImage;
-    QImage currentImage;
-    QPixmap pixmap;
-    QTransform transformation;
-
-    bool zoomedIn;
-    int horizontalOffset;
-    int verticalOffset;
-
-    bool zoomed;
-    qreal zoom;
-    bool rotated;
-    qreal angle;
-
-    struct TouchFeedback
-    {
-        bool tapped;
-        QPoint position;
-        bool sliding;
-        QPoint slidingStartPosition;
-        QBasicTimer tapTimer;
-        int tapState;
-        bool doubleTapped;
-        int tapAndHoldState;
-
-        enum { MaximumNumberOfTouches = 5 };
-        QPoint touches[MaximumNumberOfTouches];
-
-        inline TouchFeedback() { reset(); }
-        inline void reset()
-        {
-            tapped = false;
-            sliding = false;
-            tapTimer.stop();
-            tapState = 0;
-            doubleTapped = false;
-            tapAndHoldState = 0;
-            for (int i = 0; i < MaximumNumberOfTouches; ++i) {
-                touches[i] = QPoint();
-            }
-        }
-    } touchFeedback;
-    QBasicTimer feedbackFadeOutTimer;
-};
-
-#endif
diff --git a/doc/src/snippets/gestures/imageviewer/tapandholdgesture.cpp b/doc/src/snippets/gestures/imageviewer/tapandholdgesture.cpp
deleted file mode 100644
index 7dd2359..0000000
--- a/doc/src/snippets/gestures/imageviewer/tapandholdgesture.cpp
+++ /dev/null
@@ -1,159 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2009 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.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** 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 "tapandholdgesture.h"
-
-#include <QtGui/qevent.h>
-
-// #define TAPANDHOLD_USING_MOUSE
-
-/*!
-    \class TapAndHoldGesture
-    \since 4.6
-
-    \brief The TapAndHoldGesture class represents a Tap-and-Hold gesture,
-    providing additional information.
-*/
-
-const int TapAndHoldGesture::iterationCount = 40;
-const int TapAndHoldGesture::iterationTimeout = 50;
-
-/*!
-    Creates a new Tap and Hold gesture handler object and marks it as a child
-    of \a parent.
-
-    On some platforms like Windows there is a system-wide tap and hold gesture
-    that cannot be overriden, hence the gesture might never trigger and default
-    context menu will be shown instead.
-*/
-TapAndHoldGesture::TapAndHoldGesture(QWidget *parent)
-    : QGesture(parent), iteration(0)
-{
-}
-
-/*! \internal */
-bool TapAndHoldGesture::filterEvent(QEvent *event)
-{
-    if (!event->spontaneous())
-        return false;
-    const QTouchEvent *ev = static_cast<const QTouchEvent*>(event);
-    switch (event->type()) {
-    case QEvent::TouchBegin: {
-        if (timer.isActive())
-            timer.stop();
-        timer.start(TapAndHoldGesture::iterationTimeout, this);
-        const QPoint p = ev->touchPoints().at(0).pos().toPoint();
-        position = p;
-        break;
-    }
-    case QEvent::TouchUpdate:
-        if (ev->touchPoints().size() == 1) {
-            const QPoint startPos = ev->touchPoints().at(0).startPos().toPoint();
-            const QPoint pos = ev->touchPoints().at(0).pos().toPoint();
-            if ((startPos - pos).manhattanLength() > 15)
-                reset();
-        } else {
-            reset();
-        }
-        break;
-    case QEvent::TouchEnd:
-        reset();
-        break;
-#ifdef TAPANDHOLD_USING_MOUSE
-    case QEvent::MouseButtonPress: {
-        if (timer.isActive())
-            timer.stop();
-        timer.start(TapAndHoldGesture::iterationTimeout, this);
-        const QPoint p = static_cast<QMouseEvent*>(event)->pos();
-        position = startPosition = p;
-        break;
-    }
-    case QEvent::MouseMove: {
-        const QPoint startPos = startPosition;
-        const QPoint pos = static_cast<QMouseEvent*>(event)->pos();
-        if ((startPos - pos).manhattanLength() > 15)
-            reset();
-        break;
-    }
-    case QEvent::MouseButtonRelease:
-        reset();
-        break;
-#endif // TAPANDHOLD_USING_MOUSE
-    default:
-        break;
-    }
-    return false;
-}
-
-/*! \internal */
-void TapAndHoldGesture::timerEvent(QTimerEvent *event)
-{
-    if (event->timerId() != timer.timerId())
-        return;
-    if (iteration == TapAndHoldGesture::iterationCount) {
-        timer.stop();
-        updateState(Qt::GestureFinished);
-    } else {
-        updateState(Qt::GestureUpdated);
-    }
-    ++iteration;
-}
-
-/*! \internal */
-//! [tapandhold-reset]
-void TapAndHoldGesture::reset()
-{
-    timer.stop();
-    iteration = 0;
-    position = startPosition = QPoint();
-    updateState(Qt::NoGesture);
-}
-//! [tapandhold-reset]
-
-/*!
-    \property TapAndHoldGesture::pos
-
-    \brief The position of the gesture.
-*/
-QPoint TapAndHoldGesture::pos() const
-{
-    return position;
-}
diff --git a/doc/src/snippets/gestures/imageviewer/tapandholdgesture.h b/doc/src/snippets/gestures/imageviewer/tapandholdgesture.h
deleted file mode 100644
index 682342e..0000000
--- a/doc/src/snippets/gestures/imageviewer/tapandholdgesture.h
+++ /dev/null
@@ -1,74 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2009 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.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** 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.
-**
-**
-**
-**
-**
-**
-**
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef TAPANDHOLDGESTURE_H
-#define TAPANDHOLDGESTURE_H
-
-#include <QtCore/QBasicTimer>
-#include <QtGui/QGesture>
-#include <QtGui/QWidget>
-
-class TapAndHoldGesture : public QGesture
-{
-    Q_OBJECT
-    Q_PROPERTY(QPoint pos READ pos)
-
-public:
-    TapAndHoldGesture(QWidget *parent);
-
-    bool filterEvent(QEvent *event);
-    void reset();
-
-    QPoint pos() const;
-
-protected:
-    void timerEvent(QTimerEvent *event);
-
-private:
-    QBasicTimer timer;
-    int iteration;
-    QPoint position;
-    QPoint startPosition;
-    static const int iterationCount;
-    static const int iterationTimeout;
-};
-
-#endif // TAPANDHOLDGESTURE_H
diff --git a/doc/src/snippets/gestures/qgesture.cpp b/doc/src/snippets/gestures/qgesture.cpp
deleted file mode 100644
index 77f5cc2..0000000
--- a/doc/src/snippets/gestures/qgesture.cpp
+++ /dev/null
@@ -1,283 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
-** All rights reserved.
-** Contact: Nokia Corporation (qt-info@nokia.com)
-**
-** This file is part of the QtGui 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 "qgesture.h"
-#include <private/qgesture_p.h>
-#include "qgraphicsitem.h"
-
-QT_BEGIN_NAMESPACE
-
-
-class QEventFilterProxyGraphicsItem : public QGraphicsItem
-{
-public:
-    QEventFilterProxyGraphicsItem(QGesture *g)
-            : gesture(g)
-    {
-    }
-    bool sceneEventFilter(QGraphicsItem *, QEvent *event)
-    {
-        return gesture ? gesture->filterEvent(event) : false;
-    }
-    QRectF boundingRect() const { return QRectF(); }
-    void paint(QPainter*, const QStyleOptionGraphicsItem*, QWidget*) { }
-
-private:
-    QGesture *gesture;
-};
-
-/*
-    \class QGesture
-    \since 4.6
-
-    \brief The QGesture class is the base class for implementing custom
-    gestures.
-
-    This class represents both an object that recognizes a gesture out of a set
-    of input events (a gesture recognizer), and a gesture object itself that
-    can be used to get extended information about the triggered gesture.
-
-    The class has a list of properties that can be queried by the user to get
-    some gesture-specific parameters (for example, an offset of a Pan gesture).
-
-    Usually gesture recognizer implements a state machine, storing its state
-    internally in the recognizer object. The recognizer receives input events
-    through the \l{QGesture::}{filterEvent()} virtual function and decides
-    whether the event should change the state of the recognizer by emitting an
-    appropriate signal.
-
-    Input events should be either fed to the recognizer one by one with a
-    filterEvent() function, or the gesture recognizer should be attached to an
-    object it filters events for by specifying it as a parent object. The
-    QGesture object installs itself as an event filter to the parent object
-    automatically, the unsetObject() function should be used to remove an event
-    filter from the parent object. To make a
-    gesture that operates on a QGraphicsItem, both the appropriate QGraphicsView
-    should be passed as a parent object and setGraphicsItem() functions should
-    be used to attach a gesture to a graphics item.
-
-    This is a base class, to create a custom gesture type, you should subclass
-    it and implement its pure virtual functions.
-
-    \sa QPanGesture
-*/
-
-/* \fn bool QGesture::filterEvent(QEvent *event)
-
-    Parses input \a event and emits a signal when detects a gesture.
-
-    In your reimplementation of this function, if you want to filter the \a
-    event out, i.e. stop it being handled further, return true; otherwise
-    return false;
-
-    This is a pure virtual function that needs to be implemented in subclasses.
-*/
-
-/* \fn void QGesture::started()
-
-    The signal is emitted when the gesture is started. Extended information
-    about the gesture is contained in the signal sender object.
-
-    In addition to started(), a triggered() signal should also be emitted.
-*/
-
-/* \fn void QGesture::triggered()
-
-    The signal is emitted when the gesture is detected. Extended information
-    about the gesture is contained in the signal sender object.
-*/
-
-/* \fn void QGesture::finished()
-
-    The signal is emitted when the gesture is finished. Extended information
-    about the gesture is contained in the signal sender object.
-*/
-
-/* \fn void QGesture::cancelled()
-
-    The signal is emitted when the gesture is cancelled, for example the reset()
-    function is called while the gesture was in the process of emitting a
-    triggered() signal.  Extended information about the gesture is contained in
-    the sender object.
-*/
-
-
-/*
-    Creates a new gesture handler object and marks it as a child of \a parent.
-
-    The \a parent object is also the default event source for the gesture,
-    meaning that the gesture installs itself as an event filter for the \a
-    parent.
-
-    \sa setGraphicsItem()
-*/
-QGesture::QGesture(QObject *parent)
-    : QObject(*new QGesturePrivate, parent)
-{
-    if (parent)
-        parent->installEventFilter(this);
-}
-
-/* \internal
- */
-QGesture::QGesture(QGesturePrivate &dd, QObject *parent)
-    : QObject(dd, parent)
-{
-    if (parent)
-        parent->installEventFilter(this);
-}
-
-/*
-    Destroys the gesture object.
-*/
-QGesture::~QGesture()
-{
-}
-
-/* \internal
- */
-bool QGesture::eventFilter(QObject *receiver, QEvent *event)
-{
-    Q_D(QGesture);
-    if (d->graphicsItem && receiver == parent())
-        return false;
-    return filterEvent(event);
-}
-
-/*
-    \property QGesture::state
-
-    \brief The current state of the gesture.
-*/
-
-/*
-  Returns the gesture recognition state.
- */
-Qt::GestureState QGesture::state() const
-{
-    return d_func()->state;
-}
-
-/*
-  Sets this gesture's recognition state to \a state and emits appropriate
-  signals.
-
-  This functions emits the signals according to the old state and the new
-  \a state, and it should be called after all the internal properties have been
-  initialized.
-
-  \sa started(), triggered(), finished(), cancelled()
- */
-void QGesture::updateState(Qt::GestureState state)
-{
-    Q_D(QGesture);
-    if (d->state == state) {
-        if (state == Qt::GestureUpdated)
-            emit triggered();
-        return;
-    }
-    const Qt::GestureState oldState = d->state;
-    d->state = state;
-    if (state != Qt::NoGesture && oldState > state) {
-        // comparing the state as ints: state should only be changed from
-        // started to (optionally) updated and to finished.
-        qWarning("QGesture::updateState: incorrect new state");
-        return;
-    }
-    if (oldState == Qt::NoGesture)
-        emit started();
-    if (state == Qt::GestureUpdated)
-        emit triggered();
-    else if (state == Qt::GestureFinished)
-        emit finished();
-    else if (state == Qt::NoGesture)
-        emit cancelled();
-
-    if (state == Qt::GestureFinished) {
-        // gesture is finished, so we reset the internal state.
-        d->state = Qt::NoGesture;
-    }
-}
-
-/*
-    Sets the \a graphicsItem the gesture is filtering events for.
-
-    The gesture will install an event filter to the \a graphicsItem and
-    redirect them to the filterEvent() function.
-
-    \sa graphicsItem()
-*/
-void QGesture::setGraphicsItem(QGraphicsItem *graphicsItem)
-{
-    Q_D(QGesture);
-    if (d->graphicsItem && d->eventFilterProxyGraphicsItem)
-        d->graphicsItem->removeSceneEventFilter(d->eventFilterProxyGraphicsItem);
-    d->graphicsItem = graphicsItem;
-    if (!d->eventFilterProxyGraphicsItem)
-        d->eventFilterProxyGraphicsItem = new QEventFilterProxyGraphicsItem(this);
-    if (graphicsItem)
-        graphicsItem->installSceneEventFilter(d->eventFilterProxyGraphicsItem);
-}
-
-/*
-    Returns the graphics item the gesture is filtering events for.
-
-    \sa setGraphicsItem()
-*/
-QGraphicsItem* QGesture::graphicsItem() const
-{
-    return d_func()->graphicsItem;
-}
-
-/* \fn void QGesture::reset()
-
-    Resets the internal state of the gesture. This function might be called by
-    the filterEvent() implementation in a derived class, or by the user to
-    cancel a gesture.  The base class implementation calls
-    updateState(Qt::NoGesture) which emits the cancelled()
-    signal if the state() of the gesture indicated it was active.
-*/
-void QGesture::reset()
-{
-    updateState(Qt::NoGesture);
-}
-
-QT_END_NAMESPACE
diff --git a/doc/src/snippets/gestures/qgesture.h b/doc/src/snippets/gestures/qgesture.h
deleted file mode 100644
index 3fc89a1..0000000
--- a/doc/src/snippets/gestures/qgesture.h
+++ /dev/null
@@ -1,101 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
-** All rights reserved.
-** Contact: Nokia Corporation (qt-info@nokia.com)
-**
-** This file is part of the QtGui 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.
-**
-**
-**
-**
-**
-**
-**
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef QGESTURE_H
-#define QGESTURE_H
-
-#include <QtCore/qobject.h>
-#include <QtCore/qlist.h>
-#include <QtCore/qdatetime.h>
-#include <QtCore/qpoint.h>
-#include <QtCore/qrect.h>
-#include <QtCore/qmetatype.h>
-
-QT_BEGIN_HEADER
-
-QT_BEGIN_NAMESPACE
-
-QT_MODULE(Gui)
-
-class QGraphicsItem;
-class QGesturePrivate;
-class Q_GUI_EXPORT QGesture : public QObject
-{
-    Q_OBJECT
-    Q_DECLARE_PRIVATE(QGesture)
-
-    Q_PROPERTY(Qt::GestureState state READ state)
-
-public:
-    explicit QGesture(QObject *parent = 0);
-    ~QGesture();
-
-    virtual bool filterEvent(QEvent *event) = 0;
-
-    void setGraphicsItem(QGraphicsItem *);
-    QGraphicsItem *graphicsItem() const;
-
-    Qt::GestureState state() const;
-
-protected:
-    QGesture(QGesturePrivate &dd, QObject *parent);
-    bool eventFilter(QObject*, QEvent*);
-
-    virtual void reset();
-    void updateState(Qt::GestureState state);
-
-//! [qgesture-signals]
-Q_SIGNALS:
-    void started();
-    void triggered();
-    void finished();
-    void cancelled();
-//! [qgesture-signals]
-
-private:
-    friend class QWidget;
-};
-
-QT_END_NAMESPACE
-
-QT_END_HEADER
-
-#endif // QGESTURE_H
diff --git a/doc/src/snippets/gestures/qstandardgestures.cpp b/doc/src/snippets/gestures/qstandardgestures.cpp
deleted file mode 100644
index b22f6ae..0000000
--- a/doc/src/snippets/gestures/qstandardgestures.cpp
+++ /dev/null
@@ -1,483 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
-** All rights reserved.
-** Contact: Nokia Corporation (qt-info@nokia.com)
-**
-** This file is part of the QtGui 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 "qstandardgestures.h"
-#include "qstandardgestures_p.h"
-
-#include <qabstractscrollarea.h>
-#include <qscrollbar.h>
-#include <private/qapplication_p.h>
-#include <private/qevent_p.h>
-#include <private/qwidget_p.h>
-
-QT_BEGIN_NAMESPACE
-
-#ifdef Q_WS_WIN
-QWidgetPrivate *qt_widget_private(QWidget *widget);
-#endif
-
-/*!
-    \class QPanGesture
-    \since 4.6
-
-    \brief The QPanGesture class represents a Pan gesture,
-    providing additional information related to panning.
-*/
-
-/*!
-    Creates a new Pan gesture handler object and marks it as a child of \a
-    parent.
-
-    On some platform like Windows it's necessary to provide a non-null widget
-    as \a parent to get native gesture support.
-*/
-QPanGesture::QPanGesture(QWidget *parent)
-    : QGesture(*new QPanGesturePrivate, parent)
-{
-    if (parent) {
-        QApplicationPrivate *qAppPriv = QApplicationPrivate::instance();
-        qAppPriv->widgetGestures[parent].pan = this;
-#ifdef Q_WS_WIN
-        qt_widget_private(parent)->winSetupGestures();
-#endif
-    }
-}
-
-/*! \internal */
-bool QPanGesture::event(QEvent *event)
-{
-    switch (event->type()) {
-    case QEvent::ParentAboutToChange:
-        if (QWidget *w = qobject_cast<QWidget*>(parent())) {
-            QApplicationPrivate::instance()->widgetGestures[w].pan = 0;
-#ifdef Q_WS_WIN
-            qt_widget_private(w)->winSetupGestures();
-#endif
-        }
-        break;
-    case QEvent::ParentChange:
-        if (QWidget *w = qobject_cast<QWidget*>(parent())) {
-            QApplicationPrivate::instance()->widgetGestures[w].pan = this;
-#ifdef Q_WS_WIN
-            qt_widget_private(w)->winSetupGestures();
-#endif
-        }
-        break;
-    default:
-        break;
-    }
-
-#if defined(Q_OS_MAC) && !defined(QT_MAC_USE_COCOA)
-    Q_D(QPanGesture);
-    if (event->type() == QEvent::Timer) {
-        const QTimerEvent *te = static_cast<QTimerEvent *>(event);
-        if (te->timerId() == d->panFinishedTimer) {
-            killTimer(d->panFinishedTimer);
-            d->panFinishedTimer = 0;
-            d->lastOffset = QSize(0, 0);
-            updateState(Qt::GestureFinished);
-        }
-    }
-#endif
-
-    return QObject::event(event);
-}
-
-bool QPanGesture::eventFilter(QObject *receiver, QEvent *event)
-{
-#ifdef Q_WS_WIN
-    Q_D(QPanGesture);
-    if (receiver->isWidgetType() && event->type() == QEvent::NativeGesture) {
-        QNativeGestureEvent *ev = static_cast<QNativeGestureEvent*>(event);
-        QApplicationPrivate *qAppPriv = QApplicationPrivate::instance();
-        QApplicationPrivate::WidgetStandardGesturesMap::iterator it;
-        it = qAppPriv->widgetGestures.find(static_cast<QWidget*>(receiver));
-        if (it == qAppPriv->widgetGestures.end())
-            return false;
-        if (this != it.value().pan)
-            return false;
-        Qt::GestureState nextState = Qt::NoGesture;
-        switch(ev->gestureType) {
-        case QNativeGestureEvent::GestureBegin:
-            // next we might receive the first gesture update event, so we
-            // prepare for it.
-            d->state = Qt::NoGesture;
-            return false;
-        case QNativeGestureEvent::Pan:
-            nextState = Qt::GestureUpdated;
-            event->accept();
-            break;
-        case QNativeGestureEvent::GestureEnd:
-            if (state() == Qt::NoGesture)
-                return false; // some other gesture has ended
-            nextState = Qt::GestureFinished;
-            break;
-        default:
-            return false;
-        }
-        if (state() == Qt::NoGesture) {
-            d->lastOffset = d->totalOffset = QSize();
-        } else {
-            d->lastOffset = QSize(ev->position.x() - d->lastPosition.x(),
-                                  ev->position.y() - d->lastPosition.y());
-            d->totalOffset += d->lastOffset;
-        }
-        d->lastPosition = ev->position;
-        updateState(nextState);
-        return true;
-    }
-#endif
-    return QGesture::eventFilter(receiver, event);
-}
-
-/*! \internal */
-bool QPanGesture::filterEvent(QEvent *event)
-{
-    Q_D(QPanGesture);
-    if (!event->spontaneous())
-        return false;
-    const QTouchEvent *ev = static_cast<const QTouchEvent*>(event);
-    if (event->type() == QEvent::TouchBegin) {
-        QTouchEvent::TouchPoint p = ev->touchPoints().at(0);
-        d->lastPosition = p.pos().toPoint();
-        d->lastOffset = d->totalOffset = QSize();
-    } else if (event->type() == QEvent::TouchEnd) {
-        if (state() != Qt::NoGesture) {
-            if (!ev->touchPoints().isEmpty()) {
-                QTouchEvent::TouchPoint p = ev->touchPoints().at(0);
-                const QPoint pos = p.pos().toPoint();
-                const QPoint lastPos = p.lastPos().toPoint();
-                const QPoint startPos = p.startPos().toPoint();
-                d->lastOffset = QSize(pos.x() - lastPos.x(), pos.y() - lastPos.y());
-                d->totalOffset = QSize(pos.x() - startPos.x(), pos.y() - startPos.y());
-            }
-            updateState(Qt::GestureFinished);
-        }
-        reset();
-    } else if (event->type() == QEvent::TouchUpdate) {
-        QTouchEvent::TouchPoint p = ev->touchPoints().at(0);
-        const QPoint pos = p.pos().toPoint();
-        const QPoint lastPos = p.lastPos().toPoint();
-        const QPoint startPos = p.startPos().toPoint();
-        d->lastOffset = QSize(pos.x() - lastPos.x(), pos.y() - lastPos.y());
-        d->totalOffset = QSize(pos.x() - startPos.x(), pos.y() - startPos.y());
-        if (d->totalOffset.width() > 10  || d->totalOffset.height() > 10 ||
-            d->totalOffset.width() < -10 || d->totalOffset.height() < -10) {
-            updateState(Qt::GestureUpdated);
-        }
-    }
-#ifdef Q_OS_MAC
-    else if (event->type() == QEvent::Wheel) {
-        // On Mac, there is really no native panning gesture. Instead, a two
-        // finger pan is delivered as mouse wheel events. Otoh, on Windows, you
-        // either get mouse wheel events or pan events. We have decided to make this
-        // the Qt behaviour as well, meaning that on Mac, wheel
-        // events will be masked away when listening for pan events.
-#ifndef QT_MAC_USE_COCOA
-        // In Carbon we receive neither touch-, nor pan gesture events.
-        // So we create pan gestures by converting wheel events. After all, this
-        // is how things are supposed to work on mac in the first place.
-        const QWheelEvent *wev = static_cast<const QWheelEvent*>(event);
-        int offset = wev->delta() / -120;
-        d->lastOffset = wev->orientation() == Qt::Horizontal ? QSize(offset, 0) : QSize(0, offset);
-
-        if (state() == Qt::NoGesture) {
-            d->totalOffset = d->lastOffset;
-        } else {
-            d->totalOffset += d->lastOffset;
-        }
-
-        killTimer(d->panFinishedTimer);
-        d->panFinishedTimer = startTimer(200);
-        updateState(Qt::GestureUpdated);
-#endif
-        return true;
-    }
-#endif
-    return false;
-}
-
-/*! \internal */
-void QPanGesture::reset()
-{
-    Q_D(QPanGesture);
-    d->lastOffset = d->totalOffset = QSize();
-    d->lastPosition = QPoint();
-#if defined(Q_OS_MAC) && !defined(QT_MAC_USE_COCOA)
-    if (d->panFinishedTimer) {
-        killTimer(d->panFinishedTimer);
-        d->panFinishedTimer = 0;
-    }
-#endif
-    QGesture::reset();
-}
-
-/*!
-    \property QPanGesture::totalOffset
-
-    Specifies a total pan offset since the start of the gesture.
-*/
-QSize QPanGesture::totalOffset() const
-{
-    Q_D(const QPanGesture);
-    return d->totalOffset;
-}
-
-/*!
-    \property QPanGesture::lastOffset
-
-    Specifies a pan offset since the last time the gesture was
-    triggered.
-*/
-QSize QPanGesture::lastOffset() const
-{
-    Q_D(const QPanGesture);
-    return d->lastOffset;
-}
-
-
-/*!
-    \class QPinchGesture
-    \since 4.6
-
-    \brief The QPinchGesture class represents a Pinch gesture,
-    providing additional information related to zooming and/or rotation.
-*/
-
-/*!
-    Creates a new Pinch gesture handler object and marks it as a child of \a
-    parent.
-
-    On some platform like Windows it's necessary to provide a non-null widget
-    as \a parent to get native gesture support.
-*/
-QPinchGesture::QPinchGesture(QWidget *parent)
-    : QGesture(*new QPinchGesturePrivate, parent)
-{
-    if (parent) {
-        QApplicationPrivate *qAppPriv = QApplicationPrivate::instance();
-        qAppPriv->widgetGestures[parent].pinch = this;
-#ifdef Q_WS_WIN
-        qt_widget_private(parent)->winSetupGestures();
-#endif
-    }
-}
-
-/*! \internal */
-bool QPinchGesture::event(QEvent *event)
-{
-    switch (event->type()) {
-    case QEvent::ParentAboutToChange:
-        if (QWidget *w = qobject_cast<QWidget*>(parent())) {
-            QApplicationPrivate::instance()->widgetGestures[w].pinch = 0;
-#ifdef Q_WS_WIN
-            qt_widget_private(w)->winSetupGestures();
-#endif
-        }
-        break;
-    case QEvent::ParentChange:
-        if (QWidget *w = qobject_cast<QWidget*>(parent())) {
-            QApplicationPrivate::instance()->widgetGestures[w].pinch = this;
-#ifdef Q_WS_WIN
-            qt_widget_private(w)->winSetupGestures();
-#endif
-        }
-        break;
-    default:
-        break;
-    }
-    return QObject::event(event);
-}
-
-bool QPinchGesture::eventFilter(QObject *receiver, QEvent *event)
-{
-#ifdef Q_WS_WIN
-    Q_D(QPinchGesture);
-    if (receiver->isWidgetType() && event->type() == QEvent::NativeGesture) {
-        QNativeGestureEvent *ev = static_cast<QNativeGestureEvent*>(event);
-        QApplicationPrivate *qAppPriv = QApplicationPrivate::instance();
-        QApplicationPrivate::WidgetStandardGesturesMap::iterator it;
-        it = qAppPriv->widgetGestures.find(static_cast<QWidget*>(receiver));
-        if (it == qAppPriv->widgetGestures.end())
-            return false;
-        if (this != it.value().pinch)
-            return false;
-        Qt::GestureState nextState = Qt::NoGesture;
-        switch(ev->gestureType) {
-        case QNativeGestureEvent::GestureBegin:
-            // next we might receive the first gesture update event, so we
-            // prepare for it.
-            d->state = Qt::NoGesture;
-            d->scaleFactor = d->lastScaleFactor = 1;
-            d->rotationAngle = d->lastRotationAngle = 0;
-            d->startCenterPoint = d->centerPoint = d->lastCenterPoint = QPoint();
-            d->initialDistance = 0;
-            return false;
-        case QNativeGestureEvent::Rotate:
-            d->lastRotationAngle = d->rotationAngle;
-            d->rotationAngle = -1 * GID_ROTATE_ANGLE_FROM_ARGUMENT(ev->argument);
-            nextState = Qt::GestureUpdated;
-            event->accept();
-            break;
-        case QNativeGestureEvent::Zoom:
-            if (d->initialDistance != 0) {
-                d->lastScaleFactor = d->scaleFactor;
-                int distance = int(qint64(ev->argument));
-                d->scaleFactor = (qreal) distance / d->initialDistance;
-            } else {
-                d->initialDistance = int(qint64(ev->argument));
-            }
-            nextState = Qt::GestureUpdated;
-            event->accept();
-            break;
-        case QNativeGestureEvent::GestureEnd:
-            if (state() == Qt::NoGesture)
-                return false; // some other gesture has ended
-            nextState = Qt::GestureFinished;
-            break;
-        default:
-            return false;
-        }
-        if (d->startCenterPoint.isNull())
-            d->startCenterPoint = d->centerPoint;
-        d->lastCenterPoint = d->centerPoint;
-        d->centerPoint = static_cast<QWidget*>(receiver)->mapFromGlobal(ev->position);
-        updateState(nextState);
-        return true;
-    }
-#endif
-    return QGesture::eventFilter(receiver, event);
-}
-
-/*! \internal */
-bool QPinchGesture::filterEvent(QEvent *event)
-{
-    Q_UNUSED(event);
-    return false;
-}
-
-/*! \internal */
-void QPinchGesture::reset()
-{
-    Q_D(QPinchGesture);
-    d->scaleFactor = d->lastScaleFactor = 0;
-    d->rotationAngle = d->lastRotationAngle = 0;
-    d->startCenterPoint = d->centerPoint = d->lastCenterPoint = QPoint();
-    QGesture::reset();
-}
-
-/*!
-    \property QPinchGesture::scaleFactor
-
-    Specifies a scale factor of the pinch gesture.
-*/
-qreal QPinchGesture::scaleFactor() const
-{
-    return d_func()->scaleFactor;
-}
-
-/*!
-    \property QPinchGesture::lastScaleFactor
-
-    Specifies a previous scale factor of the pinch gesture.
-*/
-qreal QPinchGesture::lastScaleFactor() const
-{
-    return d_func()->lastScaleFactor;
-}
-
-/*!
-    \property QPinchGesture::rotationAngle
-
-    Specifies a rotation angle of the gesture.
-*/
-qreal QPinchGesture::rotationAngle() const
-{
-    return d_func()->rotationAngle;
-}
-
-/*!
-    \property QPinchGesture::lastRotationAngle
-
-    Specifies a previous rotation angle of the gesture.
-*/
-qreal QPinchGesture::lastRotationAngle() const
-{
-    return d_func()->lastRotationAngle;
-}
-
-/*!
-    \property QPinchGesture::centerPoint
-
-    Specifies a center point of the gesture. The point can be used as a center
-    point that the object is rotated around.
-*/
-QPoint QPinchGesture::centerPoint() const
-{
-    return d_func()->centerPoint;
-}
-
-/*!
-    \property QPinchGesture::lastCenterPoint
-
-    Specifies a previous center point of the gesture.
-*/
-QPoint QPinchGesture::lastCenterPoint() const
-{
-    return d_func()->lastCenterPoint;
-}
-
-/*!
-    \property QPinchGesture::startCenterPoint
-
-    Specifies an initial center point of the gesture. Difference between the
-    startCenterPoint and the centerPoint is the distance at which pinching
-    fingers has shifted.
-*/
-QPoint QPinchGesture::startCenterPoint() const
-{
-    return d_func()->startCenterPoint;
-}
-
-QT_END_NAMESPACE
-
-#include "moc_qstandardgestures.cpp"
-
diff --git a/doc/src/snippets/gestures/qstandardgestures.h b/doc/src/snippets/gestures/qstandardgestures.h
deleted file mode 100644
index efd6c6e..0000000
--- a/doc/src/snippets/gestures/qstandardgestures.h
+++ /dev/null
@@ -1,126 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
-** All rights reserved.
-** Contact: Nokia Corporation (qt-info@nokia.com)
-**
-** This file is part of the QtGui 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.
-**
-**
-**
-**
-**
-**
-**
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef QSTANDARDGESTURES_H
-#define QSTANDARDGESTURES_H
-
-#include <QtGui/qevent.h>
-#include <QtCore/qbasictimer.h>
-
-#include <QtGui/qgesture.h>
-
-QT_BEGIN_HEADER
-
-QT_BEGIN_NAMESPACE
-
-QT_MODULE(Gui)
-
-class QPanGesturePrivate;
-class Q_GUI_EXPORT QPanGesture : public QGesture
-{
-    Q_OBJECT
-    Q_DECLARE_PRIVATE(QPanGesture)
-
-    Q_PROPERTY(QSize totalOffset READ totalOffset)
-    Q_PROPERTY(QSize lastOffset READ lastOffset)
-
-public:
-    QPanGesture(QWidget *parent);
-
-    bool filterEvent(QEvent *event);
-
-    QSize totalOffset() const;
-    QSize lastOffset() const;
-
-protected:
-    void reset();
-
-private:
-    bool event(QEvent *event);
-    bool eventFilter(QObject *receiver, QEvent *event);
-
-    friend class QWidget;
-};
-
-class QPinchGesturePrivate;
-class Q_GUI_EXPORT QPinchGesture : public QGesture
-{
-    Q_OBJECT
-    Q_DECLARE_PRIVATE(QPinchGesture)
-
-    Q_PROPERTY(qreal scaleFactor READ scaleFactor)
-    Q_PROPERTY(qreal lastScaleFactor READ lastScaleFactor)
-
-    Q_PROPERTY(qreal rotationAngle READ rotationAngle)
-    Q_PROPERTY(qreal lastRotationAngle READ lastRotationAngle)
-
-    Q_PROPERTY(QPoint startCenterPoint READ startCenterPoint)
-    Q_PROPERTY(QPoint lastCenterPoint READ lastCenterPoint)
-    Q_PROPERTY(QPoint centerPoint READ centerPoint)
-
-public:
-    QPinchGesture(QWidget *parent);
-
-    bool filterEvent(QEvent *event);
-    void reset();
-
-    QPoint startCenterPoint() const;
-    QPoint lastCenterPoint() const;
-    QPoint centerPoint() const;
-
-    qreal scaleFactor() const;
-    qreal lastScaleFactor() const;
-
-    qreal rotationAngle() const;
-    qreal lastRotationAngle() const;
-
-private:
-    bool event(QEvent *event);
-    bool eventFilter(QObject *receiver, QEvent *event);
-
-    friend class QWidget;
-};
-
-QT_END_NAMESPACE
-
-QT_END_HEADER
-
-#endif // QSTANDARDGESTURES_H