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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Qwt User's Guide: qwt_slider.cpp Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.6 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="classes.html"><span>Classes</span></a></li> <li id="current"><a href="files.html"><span>Files</span></a></li> <li><a href="pages.html"><span>Related Pages</span></a></li> </ul></div><h1>qwt_slider.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************</span><a name="l00002"></a>00002 <span class="comment"> * Qwt Widget Library</span><a name="l00003"></a>00003 <span class="comment"> * Copyright (C) 1997 Josef Wilgen</span><a name="l00004"></a>00004 <span class="comment"> * Copyright (C) 2002 Uwe Rathmann</span><a name="l00005"></a>00005 <span class="comment"> *</span><a name="l00006"></a>00006 <span class="comment"> * This library is free software; you can redistribute it and/or</span><a name="l00007"></a>00007 <span class="comment"> * modify it under the terms of the Qwt License, Version 1.0</span><a name="l00008"></a>00008 <span class="comment"> *****************************************************************************/</span><a name="l00009"></a>00009 <a name="l00010"></a>00010 <span class="comment">// vim: expandtab</span><a name="l00011"></a>00011 <a name="l00012"></a>00012 <span class="preprocessor">#include <math.h></span><a name="l00013"></a>00013 <span class="preprocessor">#include <qevent.h></span><a name="l00014"></a>00014 <span class="preprocessor">#include <qdrawutil.h></span><a name="l00015"></a>00015 <span class="preprocessor">#include <qpainter.h></span><a name="l00016"></a>00016 <span class="preprocessor">#include <qwt_painter.h></span><a name="l00017"></a>00017 <span class="preprocessor">#include "qwt_paint_buffer.h"</span><a name="l00018"></a>00018 <span class="preprocessor">#include "qwt_scale_draw.h"</span><a name="l00019"></a>00019 <span class="preprocessor">#include "qwt_scale_map.h"</span><a name="l00020"></a>00020 <span class="preprocessor">#include "qwt_slider.h"</span><a name="l00021"></a>00021 <a name="l00022"></a>00022 <span class="keyword">class </span>QwtSlider::PrivateData<a name="l00023"></a>00023 {<a name="l00024"></a>00024 <span class="keyword">public</span>:<a name="l00025"></a>00025 QRect sliderRect;<a name="l00026"></a>00026 <a name="l00027"></a>00027 <span class="keywordtype">int</span> <a class="code" href="class_qwt_slider.html#e851b71d1694f9df30c2d491334a7b74">thumbLength</a>;<a name="l00028"></a>00028 <span class="keywordtype">int</span> <a class="code" href="class_qwt_slider.html#98c22ffcaa63bd9c9d70ab1cdb55a5a3">thumbWidth</a>;<a name="l00029"></a>00029 <span class="keywordtype">int</span> <a class="code" href="class_qwt_slider.html#acc125aac3a5d593a4834957de28469c">borderWidth</a>;<a name="l00030"></a>00030 <span class="keywordtype">int</span> scaleDist;<a name="l00031"></a>00031 <span class="keywordtype">int</span> xMargin;<a name="l00032"></a>00032 <span class="keywordtype">int</span> yMargin;<a name="l00033"></a>00033 <a name="l00034"></a>00034 <a class="code" href="class_qwt_slider.html#10836f1e83b9c8ef8e229bf7c65c3659">QwtSlider::ScalePos</a> scalePos;<a name="l00035"></a>00035 <a class="code" href="class_qwt_slider.html#60df2c6dd8d5419625a2f3f024bf29c6">QwtSlider::BGSTYLE</a> <a class="code" href="class_qwt_slider.html#c63639f5e3071a4e12bac3ce1fcaaafa">bgStyle</a>;<a name="l00036"></a>00036 <a name="l00037"></a>00037 <span class="comment">/*</span><a name="l00038"></a>00038 <span class="comment"> Scale and values might have different maps. This is</span><a name="l00039"></a>00039 <span class="comment"> confusing and I can't see strong arguments for such</span><a name="l00040"></a>00040 <span class="comment"> a feature. TODO ...</span><a name="l00041"></a>00041 <span class="comment"> */</span><a name="l00042"></a>00042 <a class="code" href="class_qwt_scale_map.html">QwtScaleMap</a> map; <span class="comment">// linear map</span><a name="l00043"></a>00043 <span class="keyword">mutable</span> QSize sizeHintCache;<a name="l00044"></a>00044 };<a name="l00045"></a>00045 <a name="l00064"></a><a class="code" href="class_qwt_slider.html#dc40d9d7d637f270c10dbdaf8c0f959d">00064</a> <a class="code" href="class_qwt_slider.html#dc40d9d7d637f270c10dbdaf8c0f959d">QwtSlider::QwtSlider</a>(QWidget *parent,<a name="l00065"></a>00065 Qt::Orientation <a class="code" href="class_qwt_abstract_slider.html#4d2521b9c31ec64b71d8e1771b156d88">orientation</a>, <a class="code" href="class_qwt_slider.html#10836f1e83b9c8ef8e229bf7c65c3659">ScalePos</a> scalePos, <a class="code" href="class_qwt_slider.html#60df2c6dd8d5419625a2f3f024bf29c6">BGSTYLE</a> <a class="code" href="class_qwt_slider.html#c63639f5e3071a4e12bac3ce1fcaaafa">bgStyle</a>): <a name="l00066"></a>00066 <a class="code" href="class_qwt_abstract_slider.html">QwtAbstractSlider</a>(orientation, parent)<a name="l00067"></a>00067 {<a name="l00068"></a>00068 initSlider(orientation, scalePos, bgStyle);<a name="l00069"></a>00069 }<a name="l00070"></a>00070 <a name="l00071"></a>00071 <span class="preprocessor">#if QT_VERSION < 0x040000</span><a name="l00072"></a>00072 <span class="preprocessor"></span><a name="l00081"></a>00081 <a class="code" href="class_qwt_slider.html#dc40d9d7d637f270c10dbdaf8c0f959d">QwtSlider::QwtSlider</a>(QWidget *parent, <span class="keyword">const</span> <span class="keywordtype">char</span>* name):<a name="l00082"></a>00082 <a class="code" href="class_qwt_abstract_slider.html">QwtAbstractSlider</a>(Qt::Horizontal, parent)<a name="l00083"></a>00083 {<a name="l00084"></a>00084 setName(name);<a name="l00085"></a>00085 initSlider(Qt::Horizontal, NoScale, BgTrough);<a name="l00086"></a>00086 }<a name="l00087"></a>00087 <span class="preprocessor">#endif</span><a name="l00088"></a>00088 <span class="preprocessor"></span><a name="l00089"></a>00089 <span class="keywordtype">void</span> QwtSlider::initSlider(Qt::Orientation orientation, <a name="l00090"></a>00090 ScalePos scalePos, BGSTYLE bgStyle)<a name="l00091"></a>00091 {<a name="l00092"></a>00092 <span class="keywordflow">if</span> (orientation == Qt::Vertical) <a name="l00093"></a>00093 setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding);<a name="l00094"></a>00094 <span class="keywordflow">else</span><a name="l00095"></a>00095 setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);<a name="l00096"></a>00096 <a name="l00097"></a>00097 <span class="preprocessor">#if QT_VERSION >= 0x040000</span><a name="l00098"></a>00098 <span class="preprocessor"></span> setAttribute(Qt::WA_WState_OwnSizePolicy, <span class="keyword">false</span>);<a name="l00099"></a>00099 <span class="preprocessor">#else</span><a name="l00100"></a>00100 <span class="preprocessor"></span> clearWState( WState_OwnSizePolicy );<a name="l00101"></a>00101 <span class="preprocessor">#endif</span><a name="l00102"></a>00102 <span class="preprocessor"></span><a name="l00103"></a>00103 <a name="l00104"></a>00104 <span class="preprocessor">#if QT_VERSION < 0x040000</span><a name="l00105"></a>00105 <span class="preprocessor"></span> setWFlags(Qt::WNoAutoErase);<a name="l00106"></a>00106 <span class="preprocessor">#endif</span><a name="l00107"></a>00107 <span class="preprocessor"></span><a name="l00108"></a>00108 d_data = <span class="keyword">new</span> QwtSlider::PrivateData;<a name="l00109"></a>00109 <a name="l00110"></a>00110 d_data->borderWidth = 2;<a name="l00111"></a>00111 d_data->scaleDist = 4;<a name="l00112"></a>00112 d_data->scalePos = scalePos;<a name="l00113"></a>00113 d_data->xMargin = 0;<a name="l00114"></a>00114 d_data->yMargin = 0;<a name="l00115"></a>00115 d_data->bgStyle = bgStyle;<a name="l00116"></a>00116 <a name="l00117"></a>00117 <span class="keywordflow">if</span> (bgStyle == BgSlot)<a name="l00118"></a>00118 {<a name="l00119"></a>00119 d_data->thumbLength = 16;<a name="l00120"></a>00120 d_data->thumbWidth = 30;<a name="l00121"></a>00121 }<a name="l00122"></a>00122 <span class="keywordflow">else</span><a name="l00123"></a>00123 {<a name="l00124"></a>00124 d_data->thumbLength = 31;<a name="l00125"></a>00125 d_data->thumbWidth = 16;<a name="l00126"></a>00126 }<a name="l00127"></a>00127 <a name="l00128"></a>00128 d_data->sliderRect.setRect(0,0,8,8);<a name="l00129"></a>00129 <a name="l00130"></a>00130 <a class="code" href="class_qwt_scale_draw.html#cd7ceeeac592ef08530788580b461c66">QwtScaleDraw::Alignment</a> align;<a name="l00131"></a>00131 <span class="keywordflow">if</span> ( orientation == Qt::Vertical )<a name="l00132"></a>00132 {<a name="l00133"></a>00133 <span class="comment">// enforce a valid combination of scale position and orientation</span><a name="l00134"></a>00134 <span class="keywordflow">if</span> ((d_data->scalePos == BottomScale) || (d_data->scalePos == TopScale))<a name="l00135"></a>00135 d_data->scalePos = NoScale;<a name="l00136"></a>00136 <span class="comment">// adopt the policy of layoutSlider (NoScale lays out like Left)</span><a name="l00137"></a>00137 <span class="keywordflow">if</span> (d_data->scalePos == RightScale)<a name="l00138"></a>00138 align = QwtScaleDraw::RightScale;<a name="l00139"></a>00139 <span class="keywordflow">else</span><a name="l00140"></a>00140 align = QwtScaleDraw::LeftScale;<a name="l00141"></a>00141 }<a name="l00142"></a>00142 <span class="keywordflow">else</span><a name="l00143"></a>00143 {<a name="l00144"></a>00144 <span class="comment">// enforce a valid combination of scale position and orientation</span><a name="l00145"></a>00145 <span class="keywordflow">if</span> ((d_data->scalePos == LeftScale) || (d_data->scalePos == RightScale))<a name="l00146"></a>00146 d_data->scalePos = NoScale;<a name="l00147"></a>00147 <span class="comment">// adopt the policy of layoutSlider (NoScale lays out like Bottom)</span><a name="l00148"></a>00148 <span class="keywordflow">if</span> (d_data->scalePos == TopScale)<a name="l00149"></a>00149 align = QwtScaleDraw::TopScale;<a name="l00150"></a>00150 <span class="keywordflow">else</span><a name="l00151"></a>00151 align = QwtScaleDraw::BottomScale;<a name="l00152"></a>00152 }<a name="l00153"></a>00153 <a name="l00154"></a>00154 <a class="code" href="class_qwt_slider.html#b3394f8eb22b75cc6add3b8d3444ad30">scaleDraw</a>()-><a class="code" href="class_qwt_scale_draw.html#7a4de0055dc1358e55c3357366a54091">setAlignment</a>(align);<a name="l00155"></a>00155 <a class="code" href="class_qwt_slider.html#b3394f8eb22b75cc6add3b8d3444ad30">scaleDraw</a>()-><a class="code" href="class_qwt_scale_draw.html#2094e09579671d0a8e4b14a636eba6ef">setLength</a>(100);<a name="l00156"></a>00156 <a name="l00157"></a>00157 <a class="code" href="class_qwt_double_range.html#43891011664b74b8e5454763a3f5ff21">setRange</a>(0.0, 100.0, 1.0);<a name="l00158"></a>00158 <a class="code" href="class_qwt_abstract_slider.html#c3713f8989b647cb79f0a5894991e36a">setValue</a>(0.0);⌨️ 快捷键说明
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