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Breadcrumbs go here --> </ul> </div> <div class="toolbuttons toolblock"> <ul> <li id="smallA" class="t_button">A</li> <li id="medA" class="t_button active">A</li> <li id="bigA" class="t_button">A</li> <li id="print" class="t_button"><a href="javascript:this.print();"> <span>Print</span></a></li> </ul> </div> </div> <div class="content mainContent"> <h1 class="title">flickable.cpp Example File</h1> <span class="small-subtitle">demos/embedded/flickable/flickable.cpp</span> <!-- $$$demos/embedded/flickable/flickable.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 demonstration applications 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 "flickable.h"</span> <span class="preprocessor">#include <QtCore></span> <span class="preprocessor">#include <QtGui></span> <span class="keyword">class</span> FlickableTicker: <span class="type"><a href="qobject.html">QObject</a></span> { <span class="keyword">public</span>: FlickableTicker(Flickable <span class="operator">*</span>scroller) { m_scroller <span class="operator">=</span> scroller; } <span class="type">void</span> start(<span class="type">int</span> interval) { <span class="keyword">if</span> (<span class="operator">!</span>m_timer<span class="operator">.</span>isActive()) m_timer<span class="operator">.</span>start(interval<span class="operator">,</span> <span class="keyword">this</span>); } <span class="type">void</span> stop() { m_timer<span class="operator">.</span>stop(); } <span class="keyword">protected</span>: <span class="type">void</span> timerEvent(<span class="type"><a href="qtimerevent.html">QTimerEvent</a></span> <span class="operator">*</span>event) { Q_UNUSED(event); m_scroller<span class="operator">-</span><span class="operator">></span>tick(); } <span class="keyword">private</span>: Flickable <span class="operator">*</span>m_scroller; <span class="type"><a href="qbasictimer.html">QBasicTimer</a></span> m_timer; }; <span class="keyword">class</span> FlickablePrivate { <span class="keyword">public</span>: <span class="keyword">typedef</span> <span class="keyword">enum</span> { Steady<span class="operator">,</span> Pressed<span class="operator">,</span> ManualScroll<span class="operator">,</span> AutoScroll<span class="operator">,</span> Stop } State; State state; <span class="type">int</span> threshold; <span class="type"><a href="qpoint.html">QPoint</a></span> pressPos; <span class="type"><a href="qpoint.html">QPoint</a></span> offset; <span class="type"><a href="qpoint.html">QPoint</a></span> delta; <span class="type"><a href="qpoint.html">QPoint</a></span> speed; FlickableTicker <span class="operator">*</span>ticker; <span class="type"><a href="qtime.html">QTime</a></span> timeStamp; <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>target; <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> ignoreList; }; Flickable<span class="operator">::</span>Flickable() { d <span class="operator">=</span> <span class="keyword">new</span> FlickablePrivate; d<span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span> FlickablePrivate<span class="operator">::</span>Steady; d<span class="operator">-</span><span class="operator">></span>threshold <span class="operator">=</span> <span class="number">10</span>; d<span class="operator">-</span><span class="operator">></span>ticker <span class="operator">=</span> <span class="keyword">new</span> FlickableTicker(<span class="keyword">this</span>); d<span class="operator">-</span><span class="operator">></span>timeStamp <span class="operator">=</span> <span class="type"><a href="qtime.html">QTime</a></span><span class="operator">::</span>currentTime(); d<span class="operator">-</span><span class="operator">></span>target <span class="operator">=</span> <span class="number">0</span>; } Flickable<span class="operator">::</span><span class="operator">~</span>Flickable() { <span class="keyword">delete</span> d; } <span class="type">void</span> Flickable<span class="operator">::</span>setThreshold(<span class="type">int</span> th) { <span class="keyword">if</span> (th <span class="operator">></span><span class="operator">=</span> <span class="number">0</span>) d<span class="operator">-</span><span class="operator">></span>threshold <span class="operator">=</span> th; } <span class="type">int</span> Flickable<span class="operator">::</span>threshold() <span class="keyword">const</span> { <span class="keyword">return</span> d<span class="operator">-</span><span class="operator">></span>threshold; } <span class="type">void</span> Flickable<span class="operator">::</span>setAcceptMouseClick(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>target) { d<span class="operator">-</span><span class="operator">></span>target <span class="operator">=</span> target; } <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="type">int</span> a <span class="operator">=</span> <span class="number">1</span><span class="operator">,</span> <span class="type">int</span> max <span class="operator">=</span> <span class="number">64</span>) { <span class="type">int</span> x <span class="operator">=</span> <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> max); <span class="type">int</span> y <span class="operator">=</span> <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> max); 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> a) : <a href="qtglobal.html#qMin">qMin</a>(<span class="number">0</span><span class="operator">,</span> x <span class="operator">+</span> a); 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> a) : <a href="qtglobal.html#qMin">qMin</a>(<span class="number">0</span><span class="operator">,</span> y <span class="operator">+</span> a); <span class="keyword">return</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(x<span class="operator">,</span> y); } <span class="type">void</span> Flickable<span class="operator">::</span>handleMousePress(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event) { event<span class="operator">-</span><span class="operator">></span>ignore(); <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>button() <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">if</span> (d<span class="operator">-</span><span class="operator">></span>ignoreList<span class="operator">.</span>removeAll(event)) <span class="keyword">return</span>; <span class="keyword">switch</span> (d<span class="operator">-</span><span class="operator">></span>state) { <span class="keyword">case</span> FlickablePrivate<span class="operator">::</span>Steady: event<span class="operator">-</span><span class="operator">></span>accept(); d<span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span> FlickablePrivate<span class="operator">::</span>Pressed; d<span class="operator">-</span><span class="operator">></span>pressPos <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pos(); <span class="keyword">break</span>; <span class="keyword">case</span> FlickablePrivate<span class="operator">::</span>AutoScroll: event<span class="operator">-</span><span class="operator">></span>accept(); d<span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span> FlickablePrivate<span class="operator">::</span>Stop; d<span class="operator">-</span><span class="operator">></span>speed <span class="operator">=</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>); d<span class="operator">-</span><span class="operator">></span>pressPos <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pos(); d<span class="operator">-</span><span class="operator">></span>offset <span class="operator">=</span> scrollOffset(); d<span class="operator">-</span><span class="operator">></span>ticker<span class="operator">-</span><span class="operator">></span>stop(); <span class="keyword">break</span>; <span class="keyword">default</span>: <span class="keyword">break</span>; } } <span class="type">void</span> Flickable<span class="operator">::</span>handleMouseRelease(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event) { event<span class="operator">-</span><span class="operator">></span>ignore(); <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>button() <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">if</span> (d<span class="operator">-</span><span class="operator">></span>ignoreList<span class="operator">.</span>removeAll(event)) <span class="keyword">return</span>; <span class="type"><a href="qpoint.html">QPoint</a></span> delta; <span class="keyword">switch</span> (d<span class="operator">-</span><span class="operator">></span>state) { <span class="keyword">case</span> FlickablePrivate<span class="operator">::</span>Pressed: event<span class="operator">-</span><span class="operator">></span>accept(); d<span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span> FlickablePrivate<span class="operator">::</span>Steady; <span class="keyword">if</span> (d<span class="operator">-</span><span class="operator">></span>target) { <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> d<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="operator">*</span>event); d<span class="operator">-</span><span class="operator">></span>ignoreList <span class="operator"><</span><span class="operator"><</span> event1; d<span class="operator">-</span><span class="operator">></span>ignoreList <span class="operator"><</span><span class="operator"><</span> event2; <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>postEvent(d<span class="operator">-</span><span class="operator">></span>target<span class="operator">,</span> event1); <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>postEvent(d<span class="operator">-</span><span class="operator">></span>target<span class="operator">,</span> event2); } <span class="keyword">break</span>; <span class="keyword">case</span> FlickablePrivate<span class="operator">::</span>ManualScroll: event<span class="operator">-</span><span class="operator">></span>accept(); delta <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pos() <span class="operator">-</span> d<span class="operator">-</span><span class="operator">></span>pressPos; <span class="keyword">if</span> (d<span class="operator">-</span><span class="operator">></span>timeStamp<span class="operator">.</span>elapsed() <span class="operator">></span> <span class="number">100</span>) { d<span class="operator">-</span><span class="operator">></span>timeStamp <span class="operator">=</span> <span class="type"><a href="qtime.html">QTime</a></span><span class="operator">::</span>currentTime(); d<span class="operator">-</span><span class="operator">></span>speed <span class="operator">=</span> delta <span class="operator">-</span> d<span class="operator">-</span><span class="operator">></span>delta; d<span class="operator">-</span><span class="operator">></span>delta <span class="operator">=</span> delta; } d<span class="operator">-</span><span class="operator">></span>offset <span class="operator">=</span> scrollOffset(); d<span class="operator">-</span><span class="operator">></span>pressPos <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pos(); <span class="keyword">if</span> (d<span class="operator">-</span><span class="operator">></span>speed <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)) { d<span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span> FlickablePrivate<span class="operator">::</span>Steady; } <span class="keyword">else</span> { d<span class="operator">-</span><span class="operator">></span>speed <span class="operator">/</span><span class="operator">=</span> <span class="number">4</span>; d<span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span> FlickablePrivate<span class="operator">::</span>AutoScroll; d<span class="operator">-</span><span class="operator">></span>ticker<span class="operator">-</span><span class="operator">></span>start(<span class="number">20</span>); } <span class="keyword">break</span>; <span class="keyword">case</span> FlickablePrivate<span class="operator">::</span>Stop: event<span class="operator">-</span><span class="operator">></span>accept(); d<span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span> FlickablePrivate<span class="operator">::</span>Steady; d<span class="operator">-</span><span class="operator">></span>offset <span class="operator">=</span> scrollOffset(); <span class="keyword">break</span>; <span class="keyword">default</span>: <span class="keyword">break</span>; } } <span class="type">void</span> Flickable<span class="operator">::</span>handleMouseMove(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event) { event<span class="operator">-</span><span class="operator">></span>ignore(); <span class="keyword">if</span> (<span class="operator">!</span>(event<span class="operator">-</span><span class="operator">></span>buttons() <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">if</span> (d<span class="operator">-</span><span class="operator">></span>ignoreList<span class="operator">.</span>removeAll(event)) <span class="keyword">return</span>; <span class="type"><a href="qpoint.html">QPoint</a></span> delta; <span class="keyword">switch</span> (d<span class="operator">-</span><span class="operator">></span>state) { <span class="keyword">case</span> FlickablePrivate<span class="operator">::</span>Pressed: <span class="keyword">case</span> FlickablePrivate<span class="operator">::</span>Stop: delta <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pos() <span class="operator">-</span> d<span class="operator">-</span><span class="operator">></span>pressPos; <span class="keyword">if</span> (delta<span class="operator">.</span>x() <span class="operator">></span> d<span class="operator">-</span><span class="operator">></span>threshold <span class="operator">|</span><span class="operator">|</span> delta<span class="operator">.</span>x() <span class="operator"><</span> <span class="operator">-</span>d<span class="operator">-</span><span class="operator">></span>threshold <span class="operator">|</span><span class="operator">|</span> delta<span class="operator">.</span>y() <span class="operator">></span> d<span class="operator">-</span><span class="operator">></span>threshold <span class="operator">|</span><span class="operator">|</span> delta<span class="operator">.</span>y() <span class="operator"><</span> <span class="operator">-</span>d<span class="operator">-</span><span class="operator">></span>threshold) { d<span class="operator">-</span><span class="operator">></span>timeStamp <span class="operator">=</span> <span class="type"><a href="qtime.html">QTime</a></span><span class="operator">::</span>currentTime(); d<span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span> FlickablePrivate<span class="operator">::</span>ManualScroll; d<span class="operator">-</span><span class="operator">></span>delta <span class="operator">=</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>); d<span class="operator">-</span><span class="operator">></span>pressPos <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pos(); event<span class="operator">-</span><span class="operator">></span>accept(); } <span class="keyword">break</span>; <span class="keyword">case</span> FlickablePrivate<span class="operator">::</span>ManualScroll: event<span class="operator">-</span><span class="operator">></span>accept(); delta <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pos() <span class="operator">-</span> d<span class="operator">-</span><span class="operator">></span>pressPos; setScrollOffset(d<span class="operator">-</span><span class="operator">></span>offset <span class="operator">-</span> delta); <span class="keyword">if</span> (d<span class="operator">-</span><span class="operator">></span>timeStamp<span class="operator">.</span>elapsed() <span class="operator">></span> <span class="number">100</span>) { d<span class="operator">-</span><span class="operator">></span>timeStamp <span class="operator">=</span> <span class="type"><a href="qtime.html">QTime</a></span><span class="operator">::</span>currentTime(); d<span class="operator">-</span><span class="operator">></span>speed <span class="operator">=</span> delta <span class="operator">-</span> d<span class="operator">-</span><span class="operator">></span>delta; d<span class="operator">-</span><span class="operator">></span>delta <span class="operator">=</span> delta; } <span class="keyword">break</span>; <span class="keyword">default</span>: <span class="keyword">break</span>; } } <span class="type">void</span> Flickable<span class="operator">::</span>tick() { <span class="keyword">if</span> (d<span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span><span class="operator">=</span> FlickablePrivate<span class="operator">::</span> AutoScroll) { d<span class="operator">-</span><span class="operator">></span>speed <span class="operator">=</span> deaccelerate(d<span class="operator">-</span><span class="operator">></span>speed); setScrollOffset(d<span class="operator">-</span><span class="operator">></span>offset <span class="operator">-</span> d<span class="operator">-</span><span class="operator">></span>speed); d<span class="operator">-</span><span class="operator">></span>offset <span class="operator">=</span> scrollOffset(); <span class="keyword">if</span> (d<span class="operator">-</span><span class="operator">></span>speed <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)) { d<span class="operator">-</span><span class="operator">></span>state <span class="operator">=</span> FlickablePrivate<span class="operator">::</span>Steady; d<span class="operator">-</span><span class="operator">></span>ticker<span class="operator">-</span><span class="operator">></span>stop(); } } <span class="keyword">else</span> { d<span class="operator">-</span><span class="operator">></span>ticker<span class="operator">-</span><span class="operator">></span>stop(); } }</pre> </div> <!-- @@@demos/embedded/flickable/flickable.cpp --> </div> </div> </div> <div class="ft"> <span></span> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2013 Digia Plc and/or its subsidiaries. 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