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<h1 class="title">flickcharm.cpp Example File</h1>
<span class="small-subtitle">demos/embedded/anomaly/src/flickcharm.cpp</span>
<!-- $$$demos/embedded/anomaly/src/flickcharm.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the demos 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.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include "flickcharm.h"</span>
<span class="preprocessor">#include <QAbstractScrollArea></span>
<span class="preprocessor">#include <QApplication></span>
<span class="preprocessor">#include <QBasicTimer></span>
<span class="preprocessor">#include <QEvent></span>
<span class="preprocessor">#include <QHash></span>
<span class="preprocessor">#include <QList></span>
<span class="preprocessor">#include <QMouseEvent></span>
<span class="preprocessor">#include <QScrollBar></span>
<span class="preprocessor">#include <QTime></span>
<span class="preprocessor">#include <QWebFrame></span>
<span class="preprocessor">#include <QWebView></span>
<span class="preprocessor">#include <QDebug></span>
<span class="keyword">const</span> <span class="type">int</span> fingerAccuracyThreshold <span class="operator">=</span> <span class="number">3</span>;
<span class="keyword">struct</span> FlickData {
<span class="keyword">typedef</span> <span class="keyword">enum</span> {
Steady<span class="operator">,</span> <span class="comment">// Interaction without scrolling</span>
ManualScroll<span class="operator">,</span> <span class="comment">// Scrolling manually with the finger on the screen</span>
AutoScroll<span class="operator">,</span> <span class="comment">// Scrolling automatically</span>
AutoScrollAcceleration <span class="comment">// Scrolling automatically but a finger is on the screen</span>
} State;
State state;
<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>widget;
<span class="type"><a href="qpoint.html">QPoint</a></span> pressPos;
<span class="type"><a href="qpoint.html">QPoint</a></span> lastPos;
<span class="type"><a href="qpoint.html">QPoint</a></span> speed;
<span class="type"><a href="qtime.html">QTime</a></span> speedTimer;
<span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">*</span><span class="operator">></span> ignored;
<span class="type"><a href="qtime.html">QTime</a></span> accelerationTimer;
<span class="type">bool</span> lastPosValid:<span class="number">1</span>;
<span class="type">bool</span> waitingAcceleration:<span class="number">1</span>;
FlickData()
: lastPosValid(<span class="keyword">false</span>)
<span class="operator">,</span> waitingAcceleration(<span class="keyword">false</span>)
{}
<span class="type">void</span> resetSpeed()
{
speed <span class="operator">=</span> <span class="type"><a href="qpoint.html">QPoint</a></span>();
lastPosValid <span class="operator">=</span> <span class="keyword">false</span>;
}
<span class="type">void</span> updateSpeed(<span class="keyword">const</span> <span class="type"><a href="qpoint.html">QPoint</a></span> <span class="operator">&</span>newPosition)
{
<span class="keyword">if</span> (lastPosValid) {
<span class="keyword">const</span> <span class="type">int</span> timeElapsed <span class="operator">=</span> speedTimer<span class="operator">.</span>elapsed();
<span class="keyword">if</span> (timeElapsed) {
<span class="keyword">const</span> <span class="type"><a href="qpoint.html">QPoint</a></span> newPixelDiff <span class="operator">=</span> (newPosition <span class="operator">-</span> lastPos);
<span class="keyword">const</span> <span class="type"><a href="qpoint.html">QPoint</a></span> pixelsPerSecond <span class="operator">=</span> newPixelDiff <span class="operator">*</span> (<span class="number">1000</span> <span class="operator">/</span> timeElapsed);
<span class="comment">// fingers are inacurates, we ignore small changes to avoid stopping the autoscroll because</span>
<span class="comment">// of a small horizontal offset when scrolling vertically</span>
<span class="keyword">const</span> <span class="type">int</span> newSpeedY <span class="operator">=</span> (<a href="qtglobal.html#qAbs">qAbs</a>(pixelsPerSecond<span class="operator">.</span>y()) <span class="operator">></span> fingerAccuracyThreshold) <span class="operator">?</span> pixelsPerSecond<span class="operator">.</span>y() : <span class="number">0</span>;
<span class="keyword">const</span> <span class="type">int</span> newSpeedX <span class="operator">=</span> (<a href="qtglobal.html#qAbs">qAbs</a>(pixelsPerSecond<span class="operator">.</span>x()) <span class="operator">></span> fingerAccuracyThreshold) <span class="operator">?</span> pixelsPerSecond<span class="operator">.</span>x() : <span class="number">0</span>;
<span class="keyword">if</span> (state <span class="operator">=</span><span class="operator">=</span> AutoScrollAcceleration) {
<span class="keyword">const</span> <span class="type">int</span> max <span class="operator">=</span> <span class="number">4000</span>; <span class="comment">// px by seconds</span>
<span class="keyword">const</span> <span class="type">int</span> oldSpeedY <span class="operator">=</span> speed<span class="operator">.</span>y();
<span class="keyword">const</span> <span class="type">int</span> oldSpeedX <span class="operator">=</span> speed<span class="operator">.</span>x();
<span class="keyword">if</span> ((oldSpeedY <span class="operator"><</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> newSpeedY <span class="operator"><</span><span class="operator">=</span> <span class="number">0</span>) <span class="operator">|</span><span class="operator">|</span> (oldSpeedY <span class="operator">></span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> newSpeedY <span class="operator">></span><span class="operator">=</span> <span class="number">0</span>)
<span class="operator">&</span><span class="operator">&</span> (oldSpeedX <span class="operator"><</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> newSpeedX <span class="operator"><</span><span class="operator">=</span> <span class="number">0</span>) <span class="operator">|</span><span class="operator">|</span> (oldSpeedX <span class="operator">></span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> newSpeedX <span class="operator">></span><span class="operator">=</span> <span class="number">0</span>)) {
speed<span class="operator">.</span>setY(<a href="qtglobal.html#qBound">qBound</a>(<span class="operator">-</span>max<span class="operator">,</span> (oldSpeedY <span class="operator">+</span> (newSpeedY <span class="operator">/</span> <span class="number">4</span>))<span class="operator">,</span> max));
speed<span class="operator">.</span>setX(<a href="qtglobal.html#qBound">qBound</a>(<span class="operator">-</span>max<span class="operator">,</span> (oldSpeedX <span class="operator">+</span> (newSpeedX <span class="operator">/</span> <span class="number">4</span>))<span class="operator">,</span> max));
} <span class="keyword">else</span> {
speed <span class="operator">=</span> <span class="type"><a href="qpoint.html">QPoint</a></span>();
}
} <span class="keyword">else</span> {
<span class="keyword">const</span> <span class="type">int</span> max <span class="operator">=</span> <span class="number">2500</span>; <span class="comment">// px by seconds</span>
<span class="comment">// we average the speed to avoid strange effects with the last delta</span>
<span class="keyword">if</span> (<span class="operator">!</span>speed<span class="operator">.</span>isNull()) {
speed<span class="operator">.</span>setX(<a href="qtglobal.html#qBound">qBound</a>(<span class="operator">-</span>max<span class="operator">,</span> (speed<span class="operator">.</span>x() <span class="operator">/</span> <span class="number">4</span>) <span class="operator">+</span> (newSpeedX <span class="operator">*</span> <span class="number">3</span> <span class="operator">/</span> <span class="number">4</span>)<span class="operator">,</span> max));
speed<span class="operator">.</span>setY(<a href="qtglobal.html#qBound">qBound</a>(<span class="operator">-</span>max<span class="operator">,</span> (speed<span class="operator">.</span>y() <span class="operator">/</span> <span class="number">4</span>) <span class="operator">+</span> (newSpeedY <span class="operator">*</span> <span class="number">3</span> <span class="operator">/</span> <span class="number">4</span>)<span class="operator">,</span> max));
} <span class="keyword">else</span> {
speed <span class="operator">=</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(newSpeedX<span class="operator">,</span> newSpeedY);
}
}
}
} <span class="keyword">else</span> {
lastPosValid <span class="operator">=</span> <span class="keyword">true</span>;
}
speedTimer<span class="operator">.</span>start();
lastPos <span class="operator">=</span> newPosition;
}
<span class="comment">// scroll by dx, dy</span>
<span class="comment">// return true if the widget was scrolled</span>
<span class="type">bool</span> scrollWidget(<span class="keyword">const</span> <span class="type">int</span> dx<span class="operator">,</span> <span class="keyword">const</span> <span class="type">int</span> dy)
{
<span class="type"><a href="qabstractscrollarea.html">QAbstractScrollArea</a></span> <span class="operator">*</span>scrollArea <span class="operator">=</span> qobject_cast<span class="operator"><</span><span class="type"><a href="qabstractscrollarea.html">QAbstractScrollArea</a></span><span class="operator">*</span><span class="operator">></span>(widget);
<span class="keyword">if</span> (scrollArea) {
<span class="keyword">const</span> <span class="type">int</span> x <span class="operator">=</span> scrollArea<span class="operator">-</span><span class="operator">></span>horizontalScrollBar()<span class="operator">-</span><span class="operator">></span>value();
<span class="keyword">const</span> <span class="type">int</span> y <span class="operator">=</span> scrollArea<span class="operator">-</span><span class="operator">></span>verticalScrollBar()<span class="operator">-</span><span class="operator">></span>value();
scrollArea<span class="operator">-</span><span class="operator">></span>horizontalScrollBar()<span class="operator">-</span><span class="operator">></span>setValue(x <span class="operator">-</span> dx);
scrollArea<span class="operator">-</span><span class="operator">></span>verticalScrollBar()<span class="operator">-</span><span class="operator">></span>setValue(y <span class="operator">-</span> dy);
<span class="keyword">return</span> (scrollArea<span class="operator">-</span><span class="operator">></span>horizontalScrollBar()<span class="operator">-</span><span class="operator">></span>value() <span class="operator">!</span><span class="operator">=</span> x
<span class="operator">|</span><span class="operator">|</span> scrollArea<span class="operator">-</span><span class="operator">></span>verticalScrollBar()<span class="operator">-</span><span class="operator">></span>value() <span class="operator">!</span><span class="operator">=</span> y);
}
<span class="type"><a href="qwebview.html">QWebView</a></span> <span class="operator">*</span>webView <span class="operator">=</span> qobject_cast<span class="operator"><</span><span class="type"><a href="qwebview.html">QWebView</a></span><span class="operator">*</span><span class="operator">></span>(widget);
<span class="keyword">if</span> (webView) {
<span class="type"><a href="qwebframe.html">QWebFrame</a></span> <span class="operator">*</span>frame <span class="operator">=</span> webView<span class="operator">-</span><span class="operator">></span>page()<span class="operator">-</span><span class="operator">></span>mainFrame();
<span class="keyword">const</span> <span class="type"><a href="qpoint.html">QPoint</a></span> position <span class="operator">=</span> frame<span class="operator">-</span><span class="operator">></span>scrollPosition();
frame<span class="operator">-</span><span class="operator">></span>setScrollPosition(position <span class="operator">-</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(dx<span class="operator">,</span> dy));
<span class="keyword">return</span> frame<span class="operator">-</span><span class="operator">></span>scrollPosition() <span class="operator">!</span><span class="operator">=</span> position;
}
<span class="keyword">return</span> <span class="keyword">false</span>;
}
<span class="type">bool</span> scrollTo(<span class="keyword">const</span> <span class="type"><a href="qpoint.html">QPoint</a></span> <span class="operator">&</span>newPosition)
{
<span class="keyword">const</span> <span class="type"><a href="qpoint.html">QPoint</a></span> delta <span class="operator">=</span> newPosition <span class="operator">-</span> lastPos;
updateSpeed(newPosition);
<span class="keyword">return</span> scrollWidget(delta<span class="operator">.</span>x()<span class="operator">,</span> delta<span class="operator">.</span>y());
}
};
<span class="keyword">class</span> FlickCharmPrivate
{
<span class="keyword">public</span>:
<span class="type"><a href="qhash.html">QHash</a></span><span class="operator"><</span><span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">*</span><span class="operator">,</span> FlickData<span class="operator">*</span><span class="operator">></span> flickData;
<span class="type"><a href="qbasictimer.html">QBasicTimer</a></span> ticker;
<span class="type"><a href="qtime.html">QTime</a></span> timeCounter;
<span class="type">void</span> startTicker(<span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>object)
{
<span class="keyword">if</span> (<span class="operator">!</span>ticker<span class="operator">.</span>isActive())
ticker<span class="operator">.</span>start(<span class="number">15</span><span class="operator">,</span> object);
timeCounter<span class="operator">.</span>start();
}
};
FlickCharm<span class="operator">::</span>FlickCharm(<span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>parent): <span class="type"><a href="qobject.html">QObject</a></span>(parent)
{
d <span class="operator">=</span> <span class="keyword">new</span> FlickCharmPrivate;
}
FlickCharm<span class="operator">::</span><span class="operator">~</span>FlickCharm()
{
<span class="keyword">delete</span> d;
}
<span class="type">void</span> FlickCharm<span class="operator">::</span>activateOn(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>widget)
{
<span class="type"><a href="qabstractscrollarea.html">QAbstractScrollArea</a></span> <span class="operator">*</span>scrollArea <span class="operator">=</span> qobject_cast<span class="operator"><</span><span class="type"><a href="qabstractscrollarea.html">QAbstractScrollArea</a></span><span class="operator">*</span><span class="operator">></span>(widget);
<span class="keyword">if</span> (scrollArea) {
scrollArea<span class="operator">-</span><span class="operator">></span>setHorizontalScrollBarPolicy(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>ScrollBarAlwaysOff);
scrollArea<span class="operator">-</span><span class="operator">></span>setVerticalScrollBarPolicy(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>ScrollBarAlwaysOff);
<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>viewport <span class="operator">=</span> scrollArea<span class="operator">-</span><span class="operator">></span>viewport();
viewport<span class="operator">-</span><span class="operator">></span>installEventFilter(<span class="keyword">this</span>);
scrollArea<span class="operator">-</span><span class="operator">></span>installEventFilter(<span class="keyword">this</span>);
d<span class="operator">-</span><span class="operator">></span>flickData<span class="operator">.</span>remove(viewport);
d<span class="operator">-</span><span class="operator">></span>flickData<span class="operator">[</span>viewport<span class="operator">]</span> <span class="operator">=</span> <span class="keyword">new</span> FlickData;
d<span class="operator">-</span><span class="operator">></span>flickData<span class="operator">[</span>viewport<span class="operator">]</span><span class="operator">-</span><span class="operator">></span>widget <span class="operator">=</span> widget;
d<span class="operator">-</span><span class="operator">></span>flickData<span class="operator">[</span>viewport<span class="operator">]</span><span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span> FlickData<span class="operator">::</span>Steady;
<span class="keyword">return</span>;
}
<span class="type"><a href="qwebview.html">QWebView</a></span> <span class="operator">*</span>webView <span class="operator">=</span> qobject_cast<span class="operator"><</span><span class="type"><a href="qwebview.html">QWebView</a></span><span class="operator">*</span><span class="operator">></span>(widget);
<span class="keyword">if</span> (webView) {
<span class="type"><a href="qwebframe.html">QWebFrame</a></span> <span class="operator">*</span>frame <span class="operator">=</span> webView<span class="operator">-</span><span class="operator">></span>page()<span class="operator">-</span><span class="operator">></span>mainFrame();
frame<span class="operator">-</span><span class="operator">></span>setScrollBarPolicy(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Vertical<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>ScrollBarAlwaysOff);
frame<span class="operator">-</span><span class="operator">></span>setScrollBarPolicy(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Horizontal<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>ScrollBarAlwaysOff);
webView<span class="operator">-</span><span class="operator">></span>installEventFilter(<span class="keyword">this</span>);
d<span class="operator">-</span><span class="operator">></span>flickData<span class="operator">.</span>remove(webView);
d<span class="operator">-</span><span class="operator">></span>flickData<span class="operator">[</span>webView<span class="operator">]</span> <span class="operator">=</span> <span class="keyword">new</span> FlickData;
d<span class="operator">-</span><span class="operator">></span>flickData<span class="operator">[</span>webView<span class="operator">]</span><span class="operator">-</span><span class="operator">></span>widget <span class="operator">=</span> webView;
d<span class="operator">-</span><span class="operator">></span>flickData<span class="operator">[</span>webView<span class="operator">]</span><span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span> FlickData<span class="operator">::</span>Steady;
<span class="keyword">return</span>;
}
<a href="qtglobal.html#qWarning">qWarning</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"FlickCharm only works on QAbstractScrollArea (and derived classes)"</span>;
<a href="qtglobal.html#qWarning">qWarning</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"or QWebView (and derived classes)"</span>;
}
<span class="type">void</span> FlickCharm<span class="operator">::</span>deactivateFrom(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>widget)
{
<span class="type"><a href="qabstractscrollarea.html">QAbstractScrollArea</a></span> <span class="operator">*</span>scrollArea <span class="operator">=</span> qobject_cast<span class="operator"><</span><span class="type"><a href="qabstractscrollarea.html">QAbstractScrollArea</a></span><span class="operator">*</span><span class="operator">></span>(widget);
<span class="keyword">if</span> (scrollArea) {
<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>viewport <span class="operator">=</span> scrollArea<span class="operator">-</span><span class="operator">></span>viewport();
viewport<span class="operator">-</span><span class="operator">></span>removeEventFilter(<span class="keyword">this</span>);
scrollArea<span class="operator">-</span><span class="operator">></span>removeEventFilter(<span class="keyword">this</span>);
<span class="keyword">delete</span> d<span class="operator">-</span><span class="operator">></span>flickData<span class="operator">[</span>viewport<span class="operator">]</span>;
d<span class="operator">-</span><span class="operator">></span>flickData<span class="operator">.</span>remove(viewport);
<span class="keyword">return</span>;
}
<span class="type"><a href="qwebview.html">QWebView</a></span> <span class="operator">*</span>webView <span class="operator">=</span> qobject_cast<span class="operator"><</span><span class="type"><a href="qwebview.html">QWebView</a></span><span class="operator">*</span><span class="operator">></span>(widget);
<span class="keyword">if</span> (webView) {
webView<span class="operator">-</span><span class="operator">></span>removeEventFilter(<span class="keyword">this</span>);
<span class="keyword">delete</span> d<span class="operator">-</span><span class="operator">></span>flickData<span class="operator">[</span>webView<span class="operator">]</span>;
d<span class="operator">-</span><span class="operator">></span>flickData<span class="operator">.</span>remove(webView);
<span class="keyword">return</span>;
}
}
<span class="keyword">static</span> <span class="type"><a href="qpoint.html">QPoint</a></span> deaccelerate(<span class="keyword">const</span> <span class="type"><a href="qpoint.html">QPoint</a></span> <span class="operator">&</span>speed<span class="operator">,</span> <span class="keyword">const</span> <span class="type">int</span> deltatime)
{
<span class="keyword">const</span> <span class="type">int</span> deltaSpeed <span class="operator">=</span> deltatime;
<span class="type">int</span> x <span class="operator">=</span> speed<span class="operator">.</span>x();
<span class="type">int</span> y <span class="operator">=</span> speed<span class="operator">.</span>y();
x <span class="operator">=</span> (x <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) <span class="operator">?</span> x : (x <span class="operator">></span> <span class="number">0</span>) <span class="operator">?</span> <a href="qtglobal.html#qMax">qMax</a>(<span class="number">0</span><span class="operator">,</span> x <span class="operator">-</span> deltaSpeed) : <a href="qtglobal.html#qMin">qMin</a>(<span class="number">0</span><span class="operator">,</span> x <span class="operator">+</span> deltaSpeed);
y <span class="operator">=</span> (y <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) <span class="operator">?</span> y : (y <span class="operator">></span> <span class="number">0</span>) <span class="operator">?</span> <a href="qtglobal.html#qMax">qMax</a>(<span class="number">0</span><span class="operator">,</span> y <span class="operator">-</span> deltaSpeed) : <a href="qtglobal.html#qMin">qMin</a>(<span class="number">0</span><span class="operator">,</span> y <span class="operator">+</span> deltaSpeed);
<span class="keyword">return</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(x<span class="operator">,</span> y);
}
<span class="type">bool</span> FlickCharm<span class="operator">::</span>eventFilter(<span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>object<span class="operator">,</span> <span class="type"><a href="qevent.html">QEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (<span class="operator">!</span>object<span class="operator">-</span><span class="operator">></span>isWidgetType())
<span class="keyword">return</span> <span class="keyword">false</span>;
<span class="keyword">const</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>Type type <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>type();
<span class="keyword">switch</span> (type) {
<span class="keyword">case</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>MouseButtonPress:
<span class="keyword">case</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>MouseMove:
<span class="keyword">case</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>MouseButtonRelease:
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>MouseButtonDblClick: <span class="comment">// skip double click</span>
<span class="keyword">return</span> <span class="keyword">true</span>;
<span class="keyword">default</span>:
<span class="keyword">return</span> <span class="keyword">false</span>;
}
<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>mouseEvent <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="qmouseevent.html">QMouseEvent</a></span><span class="operator">*</span><span class="operator">></span>(event);
<span class="keyword">if</span> (type <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>MouseMove <span class="operator">&</span><span class="operator">&</span> mouseEvent<span class="operator">-</span><span class="operator">></span>buttons() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>LeftButton)
<span class="keyword">return</span> <span class="keyword">false</span>;
<span class="keyword">if</span> (mouseEvent<span class="operator">-</span><span class="operator">></span>modifiers() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>NoModifier)
<span class="keyword">return</span> <span class="keyword">false</span>;
<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>viewport <span class="operator">=</span> qobject_cast<span class="operator"><</span><span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">*</span><span class="operator">></span>(object);
FlickData <span class="operator">*</span>data <span class="operator">=</span> d<span class="operator">-</span><span class="operator">></span>flickData<span class="operator">.</span>value(viewport);
<span class="keyword">if</span> (<span class="operator">!</span>viewport <span class="operator">|</span><span class="operator">|</span> <span class="operator">!</span>data <span class="operator">|</span><span class="operator">|</span> data<span class="operator">-</span><span class="operator">></span>ignored<span class="operator">.</span>removeAll(event))
<span class="keyword">return</span> <span class="keyword">false</span>;
<span class="keyword">const</span> <span class="type"><a href="qpoint.html">QPoint</a></span> mousePos <span class="operator">=</span> mouseEvent<span class="operator">-</span><span class="operator">></span>pos();
<span class="type">bool</span> consumed <span class="operator">=</span> <span class="keyword">false</span>;
<span class="keyword">switch</span> (data<span class="operator">-</span><span class="operator">></span>state) {
<span class="keyword">case</span> FlickData<span class="operator">::</span>Steady:
<span class="keyword">if</span> (type <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>MouseButtonPress) {
consumed <span class="operator">=</span> <span class="keyword">true</span>;
data<span class="operator">-</span><span class="operator">></span>pressPos <span class="operator">=</span> mousePos;
} <span class="keyword">else</span> <span class="keyword">if</span> (type <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>MouseButtonRelease) {
consumed <span class="operator">=</span> <span class="keyword">true</span>;
<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event1 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qmouseevent.html">QMouseEvent</a></span>(<span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>MouseButtonPress<span class="operator">,</span>
data<span class="operator">-</span><span class="operator">></span>pressPos<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>LeftButton<span class="operator">,</span>
<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>LeftButton<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>NoModifier);
<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event2 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qmouseevent.html">QMouseEvent</a></span>(<span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>MouseButtonRelease<span class="operator">,</span>
data<span class="operator">-</span><span class="operator">></span>pressPos<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>LeftButton<span class="operator">,</span>
<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>LeftButton<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>NoModifier);
data<span class="operator">-</span><span class="operator">></span>ignored <span class="operator"><</span><span class="operator"><</span> event1;
data<span class="operator">-</span><span class="operator">></span>ignored <span class="operator"><</span><span class="operator"><</span> event2;
<span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>postEvent(object<span class="operator">,</span> event1);
<span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>postEvent(object<span class="operator">,</span> event2);
} <span class="keyword">else</span> <span class="keyword">if</span> (type <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>MouseMove) {
consumed <span class="operator">=</span> <span class="keyword">true</span>;
data<span class="operator">-</span><span class="operator">></span>scrollTo(mousePos);
<span class="keyword">const</span> <span class="type"><a href="qpoint.html">QPoint</a></span> delta <span class="operator">=</span> mousePos <span class="operator">-</span> data<span class="operator">-</span><span class="operator">></span>pressPos;
<span class="keyword">if</span> (delta<span class="operator">.</span>x() <span class="operator">></span> fingerAccuracyThreshold <span class="operator">|</span><span class="operator">|</span> delta<span class="operator">.</span>y() <span class="operator">></span> fingerAccuracyThreshold)
data<span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span> FlickData<span class="operator">::</span>ManualScroll;
}
<span class="keyword">break</span>;
<span class="keyword">case</span> FlickData<span class="operator">::</span>ManualScroll:
<span class="keyword">if</span> (type <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>MouseMove) {
consumed <span class="operator">=</span> <span class="keyword">true</span>;
data<span class="operator">-</span><span class="operator">></span>scrollTo(mousePos);
} <span class="keyword">else</span> <span class="keyword">if</span> (type <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>MouseButtonRelease) {
consumed <span class="operator">=</span> <span class="keyword">true</span>;
data<span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span> FlickData<span class="operator">::</span>AutoScroll;
data<span class="operator">-</span><span class="operator">></span>lastPosValid <span class="operator">=</span> <span class="keyword">false</span>;
d<span class="operator">-</span><span class="operator">></span>startTicker(<span class="keyword">this</span>);
}
<span class="keyword">break</span>;
<span class="keyword">case</span> FlickData<span class="operator">::</span>AutoScroll:
<span class="keyword">if</span> (type <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>MouseButtonPress) {
consumed <span class="operator">=</span> <span class="keyword">true</span>;
data<span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span> FlickData<span class="operator">::</span>AutoScrollAcceleration;
data<span class="operator">-</span><span class="operator">></span>waitingAcceleration <span class="operator">=</span> <span class="keyword">true</span>;
data<span class="operator">-</span><span class="operator">></span>accelerationTimer<span class="operator">.</span>start();
data<span class="operator">-</span><span class="operator">></span>updateSpeed(mousePos);
data<span class="operator">-</span><span class="operator">></span>pressPos <span class="operator">=</span> mousePos;
} <span class="keyword">else</span> <span class="keyword">if</span> (type <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>MouseButtonRelease) {
consumed <span class="operator">=</span> <span class="keyword">true</span>;
data<span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span> FlickData<span class="operator">::</span>Steady;
data<span class="operator">-</span><span class="operator">></span>resetSpeed();
}
<span class="keyword">break</span>;
<span class="keyword">case</span> FlickData<span class="operator">::</span>AutoScrollAcceleration:
<span class="keyword">if</span> (type <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>MouseMove) {
consumed <span class="operator">=</span> <span class="keyword">true</span>;
data<span class="operator">-</span><span class="operator">></span>updateSpeed(mousePos);
data<span class="operator">-</span><span class="operator">></span>accelerationTimer<span class="operator">.</span>start();
<span class="keyword">if</span> (data<span class="operator">-</span><span class="operator">></span>speed<span class="operator">.</span>isNull())
data<span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span> FlickData<span class="operator">::</span>ManualScroll;
} <span class="keyword">else</span> <span class="keyword">if</span> (type <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>MouseButtonRelease) {
consumed <span class="operator">=</span> <span class="keyword">true</span>;
data<span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span> FlickData<span class="operator">::</span>AutoScroll;
data<span class="operator">-</span><span class="operator">></span>waitingAcceleration <span class="operator">=</span> <span class="keyword">false</span>;
data<span class="operator">-</span><span class="operator">></span>lastPosValid <span class="operator">=</span> <span class="keyword">false</span>;
}
<span class="keyword">break</span>;
<span class="keyword">default</span>:
<span class="keyword">break</span>;
}
data<span class="operator">-</span><span class="operator">></span>lastPos <span class="operator">=</span> mousePos;
<span class="keyword">return</span> <span class="keyword">true</span>;
}
<span class="type">void</span> FlickCharm<span class="operator">::</span>timerEvent(<span class="type"><a href="qtimerevent.html">QTimerEvent</a></span> <span class="operator">*</span>event)
{
<span class="type">int</span> count <span class="operator">=</span> <span class="number">0</span>;
<span class="type"><a href="qhashiterator.html">QHashIterator</a></span><span class="operator"><</span><span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">*</span><span class="operator">,</span> FlickData<span class="operator">*</span><span class="operator">></span> item(d<span class="operator">-</span><span class="operator">></span>flickData);
<span class="keyword">while</span> (item<span class="operator">.</span>hasNext()) {
item<span class="operator">.</span>next();
FlickData <span class="operator">*</span>data <span class="operator">=</span> item<span class="operator">.</span>value();
<span class="keyword">if</span> (data<span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span><span class="operator">=</span> FlickData<span class="operator">::</span>AutoScrollAcceleration
<span class="operator">&</span><span class="operator">&</span> data<span class="operator">-</span><span class="operator">></span>waitingAcceleration
<span class="operator">&</span><span class="operator">&</span> data<span class="operator">-</span><span class="operator">></span>accelerationTimer<span class="operator">.</span>elapsed() <span class="operator">></span> <span class="number">40</span>) {
data<span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span> FlickData<span class="operator">::</span>ManualScroll;
data<span class="operator">-</span><span class="operator">></span>resetSpeed();
}
<span class="keyword">if</span> (data<span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span><span class="operator">=</span> FlickData<span class="operator">::</span>AutoScroll <span class="operator">|</span><span class="operator">|</span> data<span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span><span class="operator">=</span> FlickData<span class="operator">::</span>AutoScrollAcceleration) {
<span class="keyword">const</span> <span class="type">int</span> timeElapsed <span class="operator">=</span> d<span class="operator">-</span><span class="operator">></span>timeCounter<span class="operator">.</span>elapsed();
<span class="keyword">const</span> <span class="type"><a href="qpoint.html">QPoint</a></span> delta <span class="operator">=</span> (data<span class="operator">-</span><span class="operator">></span>speed) <span class="operator">*</span> timeElapsed <span class="operator">/</span> <span class="number">1000</span>;
<span class="type">bool</span> hasScrolled <span class="operator">=</span> data<span class="operator">-</span><span class="operator">></span>scrollWidget(delta<span class="operator">.</span>x()<span class="operator">,</span> delta<span class="operator">.</span>y());
<span class="keyword">if</span> (data<span class="operator">-</span><span class="operator">></span>speed<span class="operator">.</span>isNull() <span class="operator">|</span><span class="operator">|</span> <span class="operator">!</span>hasScrolled)
data<span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span> FlickData<span class="operator">::</span>Steady;
<span class="keyword">else</span>
count<span class="operator">+</span><span class="operator">+</span>;
data<span class="operator">-</span><span class="operator">></span>speed <span class="operator">=</span> deaccelerate(data<span class="operator">-</span><span class="operator">></span>speed<span class="operator">,</span> timeElapsed);
}
}
<span class="keyword">if</span> (<span class="operator">!</span>count)
d<span class="operator">-</span><span class="operator">></span>ticker<span class="operator">.</span>stop();
<span class="keyword">else</span>
d<span class="operator">-</span><span class="operator">></span>timeCounter<span class="operator">.</span>start();
<span class="type"><a href="qobject.html">QObject</a></span><span class="operator">::</span>timerEvent(event);
}</pre>
</div>
<!-- @@@demos/embedded/anomaly/src/flickcharm.cpp -->
</div>
</div>
</div>
<div class="ft">
<span></span>
</div>
</div>
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