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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Qwt User's Guide: qwt_counter.cpp Source File</title>
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<h1>qwt_counter.cpp</h1><pre class="fragment"><div>00001 <span class="comment">/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************</span>
00002 <span class="comment"> * Qwt Widget Library</span>
00003 <span class="comment"> * Copyright (C) 1997 Josef Wilgen</span>
00004 <span class="comment"> * Copyright (C) 2002 Uwe Rathmann</span>
00005 <span class="comment"> *</span>
00006 <span class="comment"> * This library is free software; you can redistribute it and/or</span>
00007 <span class="comment"> * modify it under the terms of the Qwt License, Version 1.0</span>
00008 <span class="comment"> *****************************************************************************/</span>
00009
00010 <span class="comment">// vim: expandtab</span>
00011
00012 <span class="preprocessor">#include <qlayout.h></span>
00013 <span class="preprocessor">#include <qlineedit.h></span>
00014 <span class="preprocessor">#include <qevent.h></span>
00015 <span class="preprocessor">#include "qwt_counter.h"</span>
00016 <span class="preprocessor">#include "qwt_arrbtn.h"</span>
00017
<a name="l00027"></a><a class="code" href="class_qwt_counter.html#a0">00027</a> <a class="code" href="class_qwt_counter.html#a0">QwtCounter::QwtCounter</a>(QWidget *parent, <span class="keyword">const</span> <span class="keywordtype">char</span> *name ):
00028 QWidget(parent,name),
00029 d_blockKeys(FALSE),
00030 d_keyPressed(FALSE)
00031 {
00032 d_increment[Button1] = 1;
00033 d_increment[Button2] = 10;
00034 d_increment[Button3] = 100;
00035
00036 QHBoxLayout *layout = <span class="keyword">new</span> QHBoxLayout(<span class="keyword">this</span>);
00037 layout->setAutoAdd(TRUE);
00038
00039 <span class="keywordtype">int</span> i;
00040 <span class="keywordflow">for</span>(i = ButtonCnt - 1; i >= 0; i--)
00041 {
00042 <a class="code" href="class_qwt_arrow_button.html">QwtArrowButton</a> *btn =
00043 <span class="keyword">new</span> <a class="code" href="class_qwt_arrow_button.html">QwtArrowButton</a>(i+1, Qt::DownArrow,<span class="keyword">this</span>);
00044 btn->setFocusPolicy(QWidget::StrongFocus);
00045 btn->installEventFilter(<span class="keyword">this</span>);
00046
00047 connect(btn, SIGNAL(released()), SLOT(btnReleased()));
00048 connect(btn, SIGNAL(clicked()), SLOT(btnClicked()));
00049
00050 d_buttonDown[i] = btn;
00051 }
00052
00053 d_valueEdit = <span class="keyword">new</span> QLineEdit(<span class="keyword">this</span>);
00054 d_valueEdit->setReadOnly(TRUE);
00055 d_valueEdit->setFocusPolicy(QWidget::NoFocus);
00056
00057 layout->setStretchFactor(d_valueEdit, 10);
00058
00059 <span class="keywordflow">for</span>(i = 0; i < ButtonCnt; i++)
00060 {
00061 <a class="code" href="class_qwt_arrow_button.html">QwtArrowButton</a> *btn =
00062 <span class="keyword">new</span> <a class="code" href="class_qwt_arrow_button.html">QwtArrowButton</a>(i+1, Qt::UpArrow, <span class="keyword">this</span>);
00063 btn->setFocusPolicy(QWidget::StrongFocus);
00064 btn->installEventFilter(<span class="keyword">this</span>);
00065
00066 connect(btn, SIGNAL(released()), SLOT(btnReleased()));
00067 connect(btn, SIGNAL(clicked()), SLOT(btnClicked()));
00068
00069 d_buttonUp[i] = btn;
00070 }
00071
00072 <a class="code" href="class_qwt_counter.html#a14">setNumButtons</a>(2);
00073 <a class="code" href="class_qwt_dbl_range.html#a2">setRange</a>(0.0,1.0,0.001);
00074 <a class="code" href="class_qwt_counter.html#a18">setValue</a>(0.0);
00075 }
00076
<a name="l00078"></a><a class="code" href="class_qwt_counter.html#a21">00078</a> <span class="keywordtype">bool</span> <a class="code" href="class_qwt_counter.html#a21">QwtCounter::eventFilter</a>(QObject *object, QEvent *e)
00079 {
00080 <span class="keywordflow">if</span> ( object->inherits(<span class="stringliteral">"QPushButton"</span>) )
00081 {
00082 <span class="keywordflow">if</span> ( e->type() == QEvent::KeyPress )
00083 {
00084 <span class="keywordflow">if</span> ( !((QKeyEvent *)e)->isAutoRepeat() )
00085 d_keyPressed = TRUE;
00086 }
00087
00088 <span class="keywordflow">if</span> ( e->type() == QEvent::KeyRelease )
00089 {
00090 <span class="keywordflow">if</span> ( !((QKeyEvent *)e)->isAutoRepeat() )
00091 {
00092 d_keyPressed = FALSE;
00093
00094 <span class="comment">// Unblock key events. They might be blocked</span>
00095 <span class="comment">// to interrupt auto repeat, when we changed</span>
00096 <span class="comment">// the focus to a different button.</span>
00097
00098 d_blockKeys = FALSE;
00099 }
00100 }
00101 }
00102
00103 <span class="keywordflow">return</span> QWidget::eventFilter(object, e);
00104 }
00105
<a name="l00115"></a><a class="code" href="class_qwt_counter.html#a16">00115</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_counter.html#a16">QwtCounter::setIncSteps</a>(QwtCounter::Button btn, <span class="keywordtype">int</span> nSteps)
00116 {
00117 <span class="keywordflow">if</span> (( btn >= 0) && (btn < ButtonCnt))
00118 d_increment[btn] = nSteps;
00119 }
00120
<a name="l00127"></a><a class="code" href="class_qwt_counter.html#a17">00127</a> <span class="keywordtype">int</span> <a class="code" href="class_qwt_counter.html#a17">QwtCounter::incSteps</a>(QwtCounter::Button btn)<span class="keyword"> const</span>
00128 <span class="keyword"></span>{
00129 <span class="keywordflow">if</span> (( btn >= 0) && (btn < ButtonCnt))
00130 <span class="keywordflow">return</span> d_increment[btn];
00131
00132 <span class="keywordflow">return</span> 0;
00133 }
00134
<a name="l00142"></a><a class="code" href="class_qwt_counter.html#a18">00142</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_counter.html#a18">QwtCounter::setValue</a>(<span class="keywordtype">double</span> v)
00143 {
00144 <a class="code" href="class_qwt_dbl_range.html#a5">QwtDblRange::setValue</a>(v);
00145
00146 showNum(<a class="code" href="class_qwt_counter.html#a13">value</a>());
00147 updateButtons();
00148 }
00149
00153 <span class="keywordtype">void</span> <a class="code" href="class_qwt_dbl_range.html#b3">QwtCounter::valueChange</a>()
00154 {
00155 <span class="keywordflow">if</span> ( <a class="code" href="class_qwt_dbl_range.html#a4">isValid</a>() )
00156 showNum(<a class="code" href="class_qwt_counter.html#a13">value</a>());
00157 <span class="keywordflow">else</span>
00158 d_valueEdit->setText(QString::null);
00159
00160 updateButtons();
00161
00162 <span class="keywordflow">if</span> ( <a class="code" href="class_qwt_dbl_range.html#a4">isValid</a>() )
00163 emit <a class="code" href="class_qwt_counter.html#l1">valueChanged</a>(<a class="code" href="class_qwt_counter.html#a13">value</a>());
00164 }
00165
00174 <span class="keywordtype">void</span> QwtCounter::updateButtons()
00175 {
00176 <span class="keywordflow">if</span> ( <a class="code" href="class_qwt_dbl_range.html#a4">isValid</a>() )
00177 {
00178 <span class="comment">// 1. save enabled state of the smallest down- and up-button</span>
00179 <span class="comment">// 2. change enabled state on under- or over-flow</span>
00180 <span class="comment">// 3. switch focus if the enabled state has changed</span>
00181
00182 <span class="keywordtype">int</span> oldEnabledDown = d_buttonDown[0]->isEnabled();
00183 <span class="keywordtype">int</span> oldEnabledUp = d_buttonUp[0]->isEnabled();
00184
00185 <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> i = 0; i < ButtonCnt; i++ )
00186 {
00187 d_buttonDown[i]->setEnabled(<a class="code" href="class_qwt_counter.html#a13">value</a>() > <a class="code" href="class_qwt_dbl_range.html#a12">minValue</a>());
00188 d_buttonUp[i]->setEnabled(<a class="code" href="class_qwt_counter.html#a13">value</a>() < <a class="code" href="class_qwt_dbl_range.html#a11">maxValue</a>());
00189 }
00190
00191 QPushButton *focusButton = NULL;
00192 <span class="keywordflow">if</span> (oldEnabledDown && !d_buttonDown[0]->isEnabled())
00193 focusButton = d_buttonUp[0];
00194
00195 <span class="keywordflow">if</span> (oldEnabledUp && !d_buttonUp[0]->isEnabled())
00196 focusButton = d_buttonDown[0];
00197
00198 <span class="keywordflow">if</span> ( focusButton )
00199 {
00200 focusButton->setFocus();
00201 <span class="keywordflow">if</span> ( d_keyPressed )
00202 {
00203 <span class="comment">// Stop auto repeat until the key has been released </span>
00204 d_blockKeys = TRUE;
00205 }
00206 }
00207 }
00208 <span class="keywordflow">else</span>
00209 {
00210 <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> i = 0; i < ButtonCnt; i++ )
00211 {
00212 d_buttonDown[i]->setEnabled(FALSE);
00213 d_buttonUp[i]->setEnabled(FALSE);
00214 }
00215 }
00216 }
00217
<a name="l00222"></a><a class="code" href="class_qwt_counter.html#a14">00222</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_counter.html#a14">QwtCounter::setNumButtons</a>(<span class="keywordtype">int</span> n)
00223 {
00224 <span class="keywordflow">if</span> ( n<0 || n>ButtonCnt )
00225 <span class="keywordflow">return</span>;
00226
00227 <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> i = 0; i < ButtonCnt; i++ )
00228 {
00229 <span class="keywordflow">if</span> ( i < n )
00230 {
00231 d_buttonDown[i]->show();
00232 d_buttonUp[i]->show();
00233 }
00234 <span class="keywordflow">else</span>
00235 {
00236 d_buttonDown[i]->hide();
00237 d_buttonUp[i]->hide();
00238 }
00239 }
00240
00241 d_nButtons = n;
00242 }
00243
<a name="l00247"></a><a class="code" href="class_qwt_counter.html#a15">00247</a> <span class="keywordtype">int</span> <a class="code" href="class_qwt_counter.html#a15">QwtCounter::numButtons</a>()<span class="keyword"> const </span>
00248 <span class="keyword"></span>{
00249 <span class="keywordflow">return</span> d_nButtons;
00250 }
00251
00253 <span class="keywordtype">void</span> QwtCounter::showNum(<span class="keywordtype">double</span> d)
00254 {
00255 QString v;
00256 v.setNum(d);
00257
00258 d_valueEdit->setText(v);
00259 d_valueEdit->setCursorPosition(0);
00260 }
00261
00263 <span class="keywordtype">void</span> QwtCounter::btnClicked()
00264 {
00265 <span class="keywordflow">if</span> (d_blockKeys)
00266 {
00267 <span class="comment">// When we set the focus to a different button,</span>
00268 <span class="comment">// auto repeat has been stopped until the key will</span>
00269 <span class="comment">// be released</span>
00270
00271 <span class="keywordflow">return</span>;
00272 }
00273
00274 <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> i = 0; i < ButtonCnt; i++ )
00275 {
00276 <span class="keywordflow">if</span> ( d_buttonUp[i] == sender() )
00277 <a class="code" href="class_qwt_dbl_range.html#a14">incValue</a>(d_increment[i]);
00278
00279 <span class="keywordflow">if</span> ( d_buttonDown[i] == sender() )
00280 <a class="code" href="class_qwt_dbl_range.html#a14">incValue</a>(-d_increment[i]);
00281 }
00282 }
00283
00285 <span class="keywordtype">void</span> QwtCounter::btnReleased()
00286 {
00287 emit <a class="code" href="class_qwt_counter.html#l0">buttonReleased</a>(<a class="code" href="class_qwt_counter.html#a13">value</a>());
00288 }
00289
<a name="l00296"></a><a class="code" href="class_qwt_counter.html#b0">00296</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_counter.html#b0">QwtCounter::rangeChange</a>()
00297 {
00298 updateButtons();
00299 }
00300
<a name="l00308"></a><a class="code" href="class_qwt_counter.html#b1">00308</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_counter.html#b1">QwtCounter::fontChange</a>(<span class="keyword">const</span> QFont &f)
00309 {
00310 QWidget::fontChange( f );
00311 d_valueEdit->setFont(font());
00312 }
00313
<a name="l00315"></a><a class="code" href="class_qwt_counter.html#a20">00315</a> QSize <a class="code" href="class_qwt_counter.html#a20">QwtCounter::sizeHint</a>()<span class="keyword"> const</span>
00316 <span class="keyword"></span>{
00317 QString tmp;
00318 QFontMetrics fm(d_valueEdit->font());
00319
00320 <span class="keywordtype">int</span> w = fm.width(tmp.setNum(minValue()));
00321 <span class="keywordtype">int</span> w1 = fm.width(tmp.setNum(maxValue()));
00322 <span class="keywordflow">if</span> ( w1 > w )
00323 w = w1;
00324 w1 = fm.width(tmp.setNum(minValue() + <a class="code" href="class_qwt_counter.html#a1">step</a>()));
00325 <span class="keywordflow">if</span> ( w1 > w )
00326 w = w1;
00327 w1 = fm.width(tmp.setNum(maxValue() - <a class="code" href="class_qwt_counter.html#a1">step</a>()));
00328 <span class="keywordflow">if</span> ( w1 > w )
00329 w = w1;
00330
00331 <span class="comment">// QLineEdit::minimumSizeHint is for one char. Subtracting</span>
00332 <span class="comment">// the size for the char we get all the margins, frames ...</span>
00333
00334 <span class="preprocessor">#if QT_VERSION < 300</span>
00335 <span class="preprocessor"></span> w += d_valueEdit->minimumSizeHint().width() - fm.maxWidth();
00336 <span class="preprocessor">#else</span>
00337 <span class="preprocessor"></span> w += 2 * d_valueEdit->frameWidth() +
00338 d_valueEdit->fontMetrics().minRightBearing() + 3;
00339 <span class="preprocessor">#endif</span>
00340 <span class="preprocessor"></span>
00341 <span class="comment">// Now we replace default sizeHint contribution of d_valueEdit by</span>
00342 <span class="comment">// what we really need.</span>
00343
00344 w += QWidget::sizeHint().width() - d_valueEdit->sizeHint().width();
00345
00346 <span class="keywordflow">return</span> QSize(w, QWidget::sizeHint().height());
00347 }
00348
<a name="l00350"></a><a class="code" href="class_qwt_counter.html#a19">00350</a> QSizePolicy <a class="code" href="class_qwt_counter.html#a19">QwtCounter::sizePolicy</a>()<span class="keyword"> const</span>
00351 <span class="keyword"></span>{
00352 QSizePolicy sp;
00353 sp.setHorData( QSizePolicy::Preferred );
00354 sp.setVerData( QSizePolicy::Fixed );
00355 <span class="keywordflow">return</span> sp;
00356 }
</div></pre><hr size="1"><address style="align: right;"><small>Generated on Tue Nov 16 21:12:20 2004 for Qwt User's Guide by
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