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<div class="title">kscrollview.cpp</div> </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* This file is part of the KDE libraries</span>
<a name="l00002"></a>00002 <span class="comment"> Copyright (C) 2005 Allan Sandfeld Jensen <kde@carewolf.com></span>
<a name="l00003"></a>00003 <span class="comment"></span>
<a name="l00004"></a>00004 <span class="comment"> This library is free software; you can redistribute it and/or</span>
<a name="l00005"></a>00005 <span class="comment"> modify it under the terms of the GNU Library General Public</span>
<a name="l00006"></a>00006 <span class="comment"> License version 2 as published by the Free Software Foundation.</span>
<a name="l00007"></a>00007 <span class="comment"></span>
<a name="l00008"></a>00008 <span class="comment"> This library is distributed in the hope that it will be useful,</span>
<a name="l00009"></a>00009 <span class="comment"> but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00010"></a>00010 <span class="comment"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
<a name="l00011"></a>00011 <span class="comment"> Library General Public License for more details.</span>
<a name="l00012"></a>00012 <span class="comment"></span>
<a name="l00013"></a>00013 <span class="comment"> You should have received a copy of the GNU Library General Public License</span>
<a name="l00014"></a>00014 <span class="comment"> along with this library; see the file COPYING.LIB. If not, write to</span>
<a name="l00015"></a>00015 <span class="comment"> the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,</span>
<a name="l00016"></a>00016 <span class="comment"> Boston, MA 02110-1301, USA.</span>
<a name="l00017"></a>00017 <span class="comment">*/</span>
<a name="l00018"></a>00018
<a name="l00019"></a>00019 <span class="preprocessor">#include "config.h"</span>
<a name="l00020"></a>00020
<a name="l00021"></a>00021 <span class="preprocessor">#include <qtimer.h></span>
<a name="l00022"></a>00022 <span class="preprocessor">#include <qevent.h></span>
<a name="l00023"></a>00023 <span class="preprocessor">#include <qapplication.h></span>
<a name="l00024"></a>00024
<a name="l00025"></a>00025 <span class="preprocessor">#include "kscrollview.h"</span>
<a name="l00026"></a>00026 <span class="preprocessor">#include <kdebug.h></span>
<a name="l00027"></a>00027 <span class="preprocessor">#include <kconfig.h></span>
<a name="l00028"></a>00028 <span class="preprocessor">#include <kglobal.h></span>
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="keyword">struct </span>KScrollView::KScrollViewPrivate {
<a name="l00031"></a>00031 KScrollViewPrivate() : dx(0), dy(0), ddx(0), ddy(0), rdx(0), rdy(0), scrolling(false) {}
<a name="l00032"></a>00032 <a class="codeRef" href="qtimer.html">QTimer</a> timer;
<a name="l00033"></a>00033 <span class="keywordtype">int</span> dx;
<a name="l00034"></a>00034 <span class="keywordtype">int</span> dy;
<a name="l00035"></a>00035 <span class="comment">// Step size * 16 and residual to avoid huge difference between 1px/step and 2px/step</span>
<a name="l00036"></a>00036 <span class="keywordtype">int</span> ddx;
<a name="l00037"></a>00037 <span class="keywordtype">int</span> ddy;
<a name="l00038"></a>00038 <span class="keywordtype">int</span> rdx;
<a name="l00039"></a>00039 <span class="keywordtype">int</span> rdy;
<a name="l00040"></a>00040 <span class="keywordtype">bool</span> scrolling;
<a name="l00041"></a>00041 };
<a name="l00042"></a>00042
<a name="l00043"></a>00043 KScrollView::KScrollView( <a class="codeRef" href="qwidget.html">QWidget</a> *parent, <span class="keyword">const</span> <span class="keywordtype">char</span> *name, Qt::WFlags f )
<a name="l00044"></a>00044 : <a class="codeRef" href="qscrollview.html">QScrollView</a>( parent, name, f )
<a name="l00045"></a>00045 {
<a name="l00046"></a>00046 d = <span class="keyword">new</span> KScrollViewPrivate;
<a name="l00047"></a>00047 connect(&d->timer, SIGNAL(timeout()), <span class="keyword">this</span>, SLOT(scrollTick()));
<a name="l00048"></a>00048 }
<a name="l00049"></a>00049
<a name="l00050"></a>00050 KScrollView::~KScrollView()
<a name="l00051"></a>00051 {
<a name="l00052"></a>00052 <span class="keyword">delete</span> d;
<a name="l00053"></a>00053 }
<a name="l00054"></a>00054
<a name="l00055"></a>00055 <span class="keywordtype">void</span> KScrollView::scrollBy(<span class="keywordtype">int</span> dx, <span class="keywordtype">int</span> dy)
<a name="l00056"></a>00056 {
<a name="l00057"></a>00057 <a class="codeRef" doxygen="kdecore.tag:../../kdecore/html/" href="../../kdecore/html/classKConfigGroup.html">KConfigGroup</a> cfg( <a class="codeRef" doxygen="kdecore.tag:../../kdecore/html/" href="../../kdecore/html/classKGlobal.html#a71532b4619923ec5f7779c5f0065e6e7">KGlobal::config</a>(), <span class="stringliteral">"KDE"</span> );
<a name="l00058"></a>00058 <span class="keywordflow">if</span>( !cfg.readBoolEntry( <span class="stringliteral">"SmoothScrolling"</span>, <span class="keyword">true</span> )) {
<a name="l00059"></a>00059 <a class="codeRef" href="qscrollview.html#scrollBy">QScrollView::scrollBy</a>( dx, dy );
<a name="l00060"></a>00060 <span class="keywordflow">return</span>;
<a name="l00061"></a>00061 }
<a name="l00062"></a>00062 <span class="comment">// scrolling destination</span>
<a name="l00063"></a>00063 <span class="keywordtype">int</span> full_dx = d->dx + dx;
<a name="l00064"></a>00064 <span class="keywordtype">int</span> full_dy = d->dy + dy;
<a name="l00065"></a>00065
<a name="l00066"></a>00066 <span class="comment">// scrolling speed</span>
<a name="l00067"></a>00067 <span class="keywordtype">int</span> ddx = 0;
<a name="l00068"></a>00068 <span class="keywordtype">int</span> ddy = 0;
<a name="l00069"></a>00069
<a name="l00070"></a>00070 <span class="keywordtype">int</span> steps = SCROLL_TIME/SCROLL_TICK;
<a name="l00071"></a>00071
<a name="l00072"></a>00072 ddx = (full_dx*16)/steps;
<a name="l00073"></a>00073 ddy = (full_dy*16)/steps;
<a name="l00074"></a>00074
<a name="l00075"></a>00075 <span class="comment">// don't go under 1px/step</span>
<a name="l00076"></a>00076 <span class="keywordflow">if</span> (ddx > 0 && ddx < 16) ddx = 16;
<a name="l00077"></a>00077 <span class="keywordflow">if</span> (ddy > 0 && ddy < 16) ddy = 16;
<a name="l00078"></a>00078 <span class="keywordflow">if</span> (ddx < 0 && ddx > -16) ddx = -16;
<a name="l00079"></a>00079 <span class="keywordflow">if</span> (ddy < 0 && ddy > -16) ddy = -16;
<a name="l00080"></a>00080
<a name="l00081"></a>00081 d->dx = full_dx;
<a name="l00082"></a>00082 d->dy = full_dy;
<a name="l00083"></a>00083 d->ddx = ddx;
<a name="l00084"></a>00084 d->ddy = ddy;
<a name="l00085"></a>00085
<a name="l00086"></a>00086 <span class="keywordflow">if</span> (!d->scrolling) {
<a name="l00087"></a>00087 scrollTick();
<a name="l00088"></a>00088 startScrolling();
<a name="l00089"></a>00089 }
<a name="l00090"></a>00090 }
<a name="l00091"></a>00091 <span class="comment">/*</span>
<a name="l00092"></a>00092 <span class="comment">void KScrollView::scrollBy(int dx, int dy)</span>
<a name="l00093"></a>00093 <span class="comment">{</span>
<a name="l00094"></a>00094 <span class="comment"> if (d->scrolling)</span>
<a name="l00095"></a>00095 <span class="comment"> setContentsPos( d->x+dx, d->y+dy );</span>
<a name="l00096"></a>00096 <span class="comment"> else</span>
<a name="l00097"></a>00097 <span class="comment"> setContentsPos( contentsX() + dx, contentsY() + dy);</span>
<a name="l00098"></a>00098 <span class="comment">}</span>
<a name="l00099"></a>00099 <span class="comment"></span>
<a name="l00100"></a>00100 <span class="comment">void KScrollView::setContentsPos(int x, int y)</span>
<a name="l00101"></a>00101 <span class="comment">{</span>
<a name="l00102"></a>00102 <span class="comment"> if (x < 0) x = 0;</span>
<a name="l00103"></a>00103 <span class="comment"> if (y < 0) y = 0;</span>
<a name="l00104"></a>00104 <span class="comment"></span>
<a name="l00105"></a>00105 <span class="comment"> int dx = x - contentsX();</span>
<a name="l00106"></a>00106 <span class="comment"> int dy = y - contentsY();</span>
<a name="l00107"></a>00107 <span class="comment"></span>
<a name="l00108"></a>00108 <span class="comment"> // to large to smooth out</span>
<a name="l00109"></a>00109 <span class="comment">// if (dx > 1000 || dy > 1000) return QScrollView::setContentsPos(x,y);</span>
<a name="l00110"></a>00110 <span class="comment"></span>
<a name="l00111"></a>00111 <span class="comment"> // scrolling speed</span>
<a name="l00112"></a>00112 <span class="comment"> int ddx = 0;</span>
<a name="l00113"></a>00113 <span class="comment"> int ddy = 0;</span>
<a name="l00114"></a>00114 <span class="comment"></span>
<a name="l00115"></a>00115 <span class="comment"> int steps = SCROLL_TIME/SCROLL_TICK;</span>
<a name="l00116"></a>00116 <span class="comment"></span>
<a name="l00117"></a>00117 <span class="comment"> ddx = (dx*16)/steps;</span>
<a name="l00118"></a>00118 <span class="comment"> ddy = (dy*16)/steps;</span>
<a name="l00119"></a>00119 <span class="comment"></span>
<a name="l00120"></a>00120 <span class="comment"> d->x = x;</span>
<a name="l00121"></a>00121 <span class="comment"> d->y = y;</span>
<a name="l00122"></a>00122 <span class="comment"> d->dx = dx;</span>
<a name="l00123"></a>00123 <span class="comment"> d->dy = dy;</span>
<a name="l00124"></a>00124 <span class="comment"> d->ddx = ddx;</span>
<a name="l00125"></a>00125 <span class="comment"> d->ddy = ddy;</span>
<a name="l00126"></a>00126 <span class="comment"></span>
<a name="l00127"></a>00127 <span class="comment"> if (!d->scrolling) {</span>
<a name="l00128"></a>00128 <span class="comment"> scrollTick();</span>
<a name="l00129"></a>00129 <span class="comment"> startScrolling();</span>
<a name="l00130"></a>00130 <span class="comment"> }</span>
<a name="l00131"></a>00131 <span class="comment">} */</span>
<a name="l00132"></a>00132
<a name="l00133"></a>00133 <span class="keywordtype">void</span> KScrollView::scrollTick() {
<a name="l00134"></a>00134 <span class="keywordflow">if</span> (d->dx == 0 && d->dy == 0) {
<a name="l00135"></a>00135 stopScrolling();
<a name="l00136"></a>00136 <span class="keywordflow">return</span>;
<a name="l00137"></a>00137 }
<a name="l00138"></a>00138
<a name="l00139"></a>00139 <span class="keywordtype">int</span> tddx = d->ddx + d->rdx;
<a name="l00140"></a>00140 <span class="keywordtype">int</span> tddy = d->ddy + d->rdy;
<a name="l00141"></a>00141
<a name="l00142"></a>00142 <span class="keywordtype">int</span> ddx = tddx / 16;
<a name="l00143"></a>00143 <span class="keywordtype">int</span> ddy = tddy / 16;
<a name="l00144"></a>00144 d->rdx = tddx % 16;
<a name="l00145"></a>00145 d->rdy = tddy % 16;
<a name="l00146"></a>00146
<a name="l00147"></a>00147 <span class="keywordflow">if</span> (d->dx > 0 && ddx > d->dx) ddx = d->dx;
<a name="l00148"></a>00148 <span class="keywordflow">else</span>
<a name="l00149"></a>00149 <span class="keywordflow">if</span> (d->dx < 0 && ddx < d->dx) ddx = d->dx;
<a name="l00150"></a>00150
<a name="l00151"></a>00151 <span class="keywordflow">if</span> (d->dy > 0 && ddy > d->dy) ddy = d->dy;
<a name="l00152"></a>00152 <span class="keywordflow">else</span>
<a name="l00153"></a>00153 <span class="keywordflow">if</span> (d->dy < 0 && ddy < d->dy) ddy = d->dy;
<a name="l00154"></a>00154
<a name="l00155"></a>00155 d->dx -= ddx;
<a name="l00156"></a>00156 d->dy -= ddy;
<a name="l00157"></a>00157
<a name="l00158"></a>00158 <span class="comment">// QScrollView::setContentsPos( contentsX() + ddx, contentsY() + ddy);</span>
<a name="l00159"></a>00159 <a class="codeRef" href="qscrollview.html#scrollBy">QScrollView::scrollBy</a>(ddx, ddy);
<a name="l00160"></a>00160 }
<a name="l00161"></a>00161
<a name="l00162"></a>00162 <span class="keywordtype">void</span> KScrollView::startScrolling()
<a name="l00163"></a>00163 {
<a name="l00164"></a>00164 d->scrolling = <span class="keyword">true</span>;
<a name="l00165"></a>00165 d->timer.start(SCROLL_TICK, <span class="keyword">false</span>);
<a name="l00166"></a>00166 }
<a name="l00167"></a>00167
<a name="l00168"></a>00168 <span class="keywordtype">void</span> KScrollView::stopScrolling()
<a name="l00169"></a>00169 {
<a name="l00170"></a>00170 d->timer.stop();
<a name="l00171"></a>00171 d->dx = d->dy = 0;
<a name="l00172"></a>00172 d->scrolling = <span class="keyword">false</span>;
<a name="l00173"></a>00173 }
<a name="l00174"></a>00174
<a name="l00175"></a>00175 <span class="comment">// Overloaded from QScrollView and QScrollBar</span>
<a name="l00176"></a>00176 <span class="keywordtype">void</span> KScrollView::wheelEvent( <a class="codeRef" href="qwheelevent.html">QWheelEvent</a> *e )
<a name="l00177"></a>00177 {
<a name="l00178"></a>00178 <span class="keywordtype">int</span> pageStep = <a class="codeRef" href="qscrollview.html#verticalScrollBar">verticalScrollBar</a>()->pageStep();
<a name="l00179"></a>00179 <span class="keywordtype">int</span> lineStep = <a class="codeRef" href="qscrollview.html#verticalScrollBar">verticalScrollBar</a>()->lineStep();
<a name="l00180"></a>00180 <span class="keywordtype">int</span> step = QMIN( <a class="codeRef" href="qapplication.html#wheelScrollLines">QApplication::wheelScrollLines</a>()*lineStep, pageStep );
<a name="l00181"></a>00181 <span class="keywordflow">if</span> ( ( e-><a class="codeRef" href="qwheelevent.html#state">state</a>() & ControlButton ) || ( e-><a class="codeRef" href="qwheelevent.html#state">state</a>() & ShiftButton ) )
<a name="l00182"></a>00182 step = pageStep;
<a name="l00183"></a>00183
<a name="l00184"></a>00184 <span class="keywordtype">int</span> dy = (e-><a class="codeRef" href="qwheelevent.html#delta">delta</a>()*step)/120;
<a name="l00185"></a>00185 scrollBy(0,-dy);
<a name="l00186"></a>00186 e-><a class="codeRef" href="qwheelevent.html#accept">accept</a>();
<a name="l00187"></a>00187 }
<a name="l00188"></a>00188
<a name="l00189"></a>00189 <span class="preprocessor">#include "kscrollview.moc"</span>
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<option value="classKEditToolbar.html">kedittoolbar</option>, <option value="classKEditToolbarWidget.html">kedittoolbarwidget</option>, <option value="classKFloatValidator.html">kfloatvalidator</option>, <option value="classKFontChooser.html">kfontchooser</option>, <option value="classKFontCombo.html">kfontcombo</option>, <option value="classKFontDialog.html">kfontdialog</option>, <option value="classKFontRequester.html">kfontrequester</option>, <option value="classKGradientSelector.html">kgradientselector</option>, <option value="classKGuiItem.html">kguiitem</option>, <option value="classKHelpMenu.html">khelpmenu</option>, <option value="classKHistoryCombo.html">khistorycombo</option>, <option value="classKHSSelector.html">khsselector</option>, <option value="classKIconView.html">kiconview</option>, <option value="classKIconViewItem.html">kiconviewitem</option>, <option value="classKIconViewSearchLine.html">kiconviewsearchline</option>, <option 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