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<h1>qwt_push_button.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 <qpainter.h></span>
00013 <span class="preprocessor">#include <qpicture.h></span>
00014 <span class="preprocessor">#include <qsimplerichtext.h></span>
00015 <span class="preprocessor">#include <qstylesheet.h></span>
00016 <span class="preprocessor">#include <qstyle.h></span>
00017 <span class="preprocessor">#include "qwt_text.h"</span>
00018 <span class="preprocessor">#include "qwt_push_button.h"</span>
00019
00020 <span class="preprocessor">#ifndef QT_NO_PICTURE</span>
00021 <span class="preprocessor"></span>
00022 <span class="keyword">class </span>QwtPBPaintFilter: <span class="keyword">public</span> QPicture
00023 {
00024 <span class="comment">// A helper class that filters the QPushButton paint commands</span>
00025 <span class="comment">// and changes them according the additional features of QwtPushButton </span>
00026
00027 <span class="keyword">public</span>:
00028 QwtPBPaintFilter(<span class="keyword">const</span> <a class="code" href="class_qwt_push_button.html">QwtPushButton</a> *);
00029
00030 <span class="keyword">protected</span>:
00031 <span class="keyword">virtual</span> <span class="keywordtype">bool</span> cmd(<span class="keywordtype">int</span>, QPainter *, QPDevCmdParam *);
00032
00033 <span class="keyword">private</span>:
00034 <span class="keywordtype">bool</span> isLabel(<span class="keyword">const</span> QPixmap *) const;
00035 QRect indentRect(const QRect &) const;
00036
00037 const <a class="code" href="class_qwt_push_button.html">QwtPushButton</a> *d_button;
00038 QRect d_iconRect;
00039 <span class="keywordtype">bool</span> d_inFilter;
00040 };
00041
00042 QwtPBPaintFilter::QwtPBPaintFilter(const <a class="code" href="class_qwt_push_button.html">QwtPushButton</a> *button):
00043 d_button(button),
00044 d_inFilter(FALSE)
00045 {
00046 }
00047
00048 <span class="keywordtype">bool</span> QwtPBPaintFilter::cmd(<span class="keywordtype">int</span> c, QPainter *painter, QPDevCmdParam *param)
00049 {
00050 <span class="keywordflow">switch</span>(c)
00051 {
00052 <span class="keywordflow">case</span> PdcDrawTextFormatted:
00053 <span class="keywordflow">case</span> PdcDrawText2Formatted:
00054 {
00055 Qt::TextFormat textFormat = d_button->usedTextFormat();
00056 <span class="keywordflow">if</span> ( textFormat == Qt::PlainText )
00057 {
00058 param[1].ival = d_button->alignment();
00059
00060 QRect &r = *((QRect *)param[0].rect);
00061 r = indentRect(r);
00062
00063 <span class="keywordflow">return</span> QPicture::cmd(c, painter, param);
00064 }
00065 <span class="keywordflow">if</span> ( textFormat == Qt::RichText )
00066 {
00067 <span class="keywordflow">if</span> ( !d_inFilter ) <span class="comment">// avoid recursive calls</span>
00068 {
00069 d_inFilter = TRUE;
00070 <a class="code" href="class_qwt_rich_text.html">QwtRichText</a> richText(*param[2].str, painter->font(),
00071 d_button->alignment(), painter->pen().color());
00072 richText.draw(painter, indentRect(*param[0].rect));
00073 d_inFilter = FALSE;
00074 <span class="keywordflow">return</span> TRUE;
00075 }
00076 }
00077 <span class="keywordflow">break</span>;
00078 }
00079 <span class="keywordflow">case</span> PdcDrawPixmap:
00080 {
00081 <span class="keywordflow">if</span> ( d_inFilter ) <span class="comment">// avoid recursive calls</span>
00082 {
00083 <span class="comment">// There might be pixmaps embedded in rich text.</span>
00084 <span class="comment">// This problem is solved by the d_inFilter guard </span>
00085 <span class="comment">// above too.</span>
00086 <span class="keywordflow">break</span>;
00087 }
00088
00089 <span class="keywordflow">if</span> ( isLabel(param[1].pixmap) &&
00090 !(d_button->alignment() & Qt::AlignCenter))
00091 {
00092 <span class="keyword">const</span> QRect contentsRect =
00093 <span class="preprocessor">#if QT_VERSION >= 300</span>
00094 <span class="preprocessor"></span> d_button->style().subRect(
00095 QStyle::SR_PushButtonContents, d_button);
00096 <span class="preprocessor">#else</span>
00097 <span class="preprocessor"></span> d_button->style().pushButtonContentsRect(
00098 (QPushButton *)d_button);
00099 <span class="preprocessor">#endif</span>
00100 <span class="preprocessor"></span>
00101 QRect pixRect = contentsRect;
00102 <span class="keywordflow">if</span> ( !d_iconRect.isEmpty() )
00103 pixRect.setX(d_iconRect.right());
00104
00105 <span class="comment">// Many styles move the label right/down</span>
00106 <span class="comment">// when the button is down.</span>
00107
00108 <span class="preprocessor">#if QT_VERSION >= 300</span>
00109 <span class="preprocessor"></span> <span class="keyword">const</span> QRect &r = *((QRect *)param[0].rect);
00110 <span class="preprocessor">#else</span>
00111 <span class="preprocessor"></span> <span class="keyword">const</span> QRect r(*param[0].point, param[1].pixmap->size());
00112 <span class="preprocessor">#endif</span>
00113 <span class="preprocessor"></span> <span class="keyword">const</span> <span class="keywordtype">int</span> offsetY = r.center().y() - pixRect.center().y();
00114 <span class="keyword">const</span> <span class="keywordtype">int</span> offsetX = d_iconRect.isEmpty() ? offsetY : 0;
00115 pixRect.moveBy(offsetX, offsetY);
00116
00117 <span class="keywordflow">if</span> ( d_button->indent() > 0 )
00118 {
00119 <span class="keyword">const</span> <span class="keywordtype">int</span> indent = d_button->indent();
00120 <span class="keyword">const</span> <span class="keywordtype">int</span> align = d_button->alignment();
00121
00122 <span class="keywordflow">if</span> ( align & Qt::AlignRight )
00123 pixRect.setRight(pixRect.right() - indent);
00124 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( align & Qt::AlignLeft )
00125 pixRect.setLeft(pixRect.left() + indent);
00126
00127 <span class="keywordflow">if</span> ( align & Qt::AlignTop )
00128 pixRect.setTop(pixRect.top() + indent);
00129 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( align & Qt::AlignBottom )
00130 pixRect.setBottom(pixRect.bottom() - indent);
00131 }
00132
00133 pixRect &= contentsRect; <span class="comment">// clip to contentsRect</span>
00134
00135 d_inFilter = TRUE;
00136
00137 d_button->style().drawItem(painter,
00138 #<span class="keywordflow">if</span> QT_VERSION >= 300
00139 pixRect,
00140 #<span class="keywordflow">else</span>
00141 pixRect.x(), pixRect.y(),
00142 pixRect.width(), pixRect.height(),
00143 <span class="preprocessor">#endif</span>
00144 <span class="preprocessor"></span> d_button->alignment(), d_button->colorGroup(),
00145 d_button->isEnabled(), param[1].pixmap, QString::null);
00146
00147 d_inFilter = FALSE;
00148 <span class="keywordflow">return</span> TRUE;
00149 }
00150 <span class="keywordflow">else</span>
00151 {
00152 <span class="comment">// We save the position of the icon. We need it later</span>
00153 <span class="comment">// to align the label pixmap. Hope that there are no styles</span>
00154 <span class="comment">// that paint the pixmap before the icon.</span>
00155 <span class="preprocessor">#if QT_VERSION < 300</span>
00156 <span class="preprocessor"></span> d_iconRect = QRect(*param[0].point, param[1].pixmap->size());
00157 <span class="preprocessor">#else</span>
00158 <span class="preprocessor"></span> d_iconRect = *param[0].rect;
00159 <span class="preprocessor">#endif</span>
00160 <span class="preprocessor"></span> }
00161 <span class="keywordflow">break</span>;
00162 }
00163 }
00164 <span class="keywordflow">return</span> QPicture::cmd(c, painter, param);
00165 }
00166
00167 QRect QwtPBPaintFilter::indentRect(<span class="keyword">const</span> QRect &rect)<span class="keyword"> const</span>
00168 <span class="keyword"></span>{
00169 <span class="keyword">const</span> <span class="keywordtype">int</span> indent = d_button->indent();
00170 <span class="keywordflow">if</span> ( indent <= 0 )
00171 <span class="keywordflow">return</span> rect;
00172
00173 QRect r = rect;
00174 <span class="keywordflow">if</span> ( d_button->alignment() & Qt::AlignRight )
00175 r.setRight(r.right() - indent);
00176 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( d_button->alignment() & Qt::AlignLeft )
00177 r.setLeft(r.left() + indent);
00178
00179 <span class="keywordflow">if</span> ( d_button->alignment() & Qt::AlignTop )
00180 r.setTop(r.top() + indent);
00181 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( d_button->alignment() & Qt::AlignBottom )
00182 r.setBottom(r.bottom() - indent);
00183
00184 <span class="keywordflow">return</span> r;
00185 }
00186
00187 <span class="keywordtype">bool</span> QwtPBPaintFilter::isLabel(<span class="keyword">const</span> QPixmap *pixmap)<span class="keyword"> const</span>
00188 <span class="keyword"></span>{
00189 <span class="keywordflow">if</span> ( !d_button->pixmap() ||
00190 d_button->pixmap()->serialNumber() != pixmap->serialNumber() )
00191 {
00192 <span class="keywordflow">return</span> FALSE;
00193 }
00194
00195 <span class="keywordflow">if</span> ( d_button->iconSet() && !d_button->iconSet()->isNull() )
00196 {
00197 <span class="keywordflow">if</span> ( d_button->iconSet()->pixmap().serialNumber() ==
00198 pixmap->serialNumber() )
00199 {
00200 <span class="comment">// Iconset and label are both set, and use the same pixmap.</span>
00201 <span class="comment">// We hope the iconSet is painted first.</span>
00202
00203 <span class="keyword">static</span> <span class="keywordtype">bool</span> firstPixmap = TRUE;
00204 firstPixmap = !firstPixmap;
00205
00206 <span class="keywordflow">return</span> !firstPixmap;
00207 }
00208 }
00209 <span class="keywordflow">return</span> TRUE;
00210 }
00211
00212 <span class="preprocessor">#endif // !QT_NO_PICTURE</span>
00213 <span class="preprocessor"></span>
<a name="l00217"></a><a class="code" href="class_qwt_push_button.html#a0">00217</a> <a class="code" href="class_qwt_push_button.html#a0">QwtPushButton::QwtPushButton</a>(QWidget *parent, <span class="keyword">const</span> <span class="keywordtype">char</span> *name):
00218 QPushButton(parent, name)
00219 {
00220 init();
00221 }
00222
<a name="l00227"></a><a class="code" href="class_qwt_push_button.html#a1">00227</a> <a class="code" href="class_qwt_push_button.html#a0">QwtPushButton::QwtPushButton</a>(<span class="keyword">const</span> QString &text,
00228 QWidget *parent, <span class="keyword">const</span> <span class="keywordtype">char</span> *name):
00229 QPushButton(text, parent, name)
00230 {
00231 init();
00232 }
00233
<a name="l00237"></a><a class="code" href="class_qwt_push_button.html#a2">00237</a> <a class="code" href="class_qwt_push_button.html#a0">QwtPushButton::QwtPushButton</a>(<span class="keyword">const</span> QIconSet &iconSet, <span class="keyword">const</span> QString &text,
00238 QWidget *parent, <span class="keyword">const</span> <span class="keywordtype">char</span> *name):
00239 QPushButton(iconSet, text, parent, name)
00240 {
00241 init();
00242 }
00243
00245 <span class="keywordtype">void</span> QwtPushButton::init()
00246 {
00247 d_textFormat = Qt::AutoText;
00248 d_alignment = Qt::AlignCenter | Qt::ExpandTabs | Qt::WordBreak;
00249 d_indent = 4;
00250 }
00251
<a name="l00262"></a><a class="code" href="class_qwt_push_button.html#a5">00262</a> Qt::TextFormat <a class="code" href="class_qwt_push_button.html#a5">QwtPushButton::usedTextFormat</a>()<span class="keyword"> const</span>
00263 <span class="keyword"></span>{
00264 <span class="preprocessor">#ifndef QT_NO_PICTURE</span>
00265 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( d_textFormat == Qt::AutoText && QStyleSheet::mightBeRichText(text()) )
00266 <span class="keywordflow">return</span> Qt::RichText;
00267 <span class="preprocessor">#endif</span>
00268 <span class="preprocessor"></span>
00269 <span class="keywordflow">return</span> Qt::PlainText;
00270 }
00271
<a name="l00277"></a><a class="code" href="class_qwt_push_button.html#a3">00277</a> Qt::TextFormat <a class="code" href="class_qwt_push_button.html#a3">QwtPushButton::textFormat</a>()<span class="keyword"> const</span>
00278 <span class="keyword"></span>{
00279 <span class="keywordflow">return</span> d_textFormat;
00280 }
00281
<a name="l00291"></a><a class="code" href="class_qwt_push_button.html#a4">00291</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_push_button.html#a4">QwtPushButton::setTextFormat</a>(TextFormat textFormat)
00292 {
00293 d_textFormat = textFormat;
00294 }
00295
<a name="l00301"></a><a class="code" href="class_qwt_push_button.html#a6">00301</a> <span class="keywordtype">int</span> <a class="code" href="class_qwt_push_button.html#a6">QwtPushButton::alignment</a>()<span class="keyword"> const</span>
00302 <span class="keyword"></span>{
00303 <span class="keywordflow">return</span> d_alignment;
00304 }
00305
<a name="l00315"></a><a class="code" href="class_qwt_push_button.html#a7">00315</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_push_button.html#a7">QwtPushButton::setAlignment</a>(<span class="keywordtype">int</span> alignment)
00316 {
00317 d_alignment = alignment;
00318 }
00319
<a name="l00325"></a><a class="code" href="class_qwt_push_button.html#a9">00325</a> <span class="keywordtype">int</span> <a class="code" href="class_qwt_push_button.html#a9">QwtPushButton::indent</a>()<span class="keyword"> const</span>
00326 <span class="keyword"></span>{
00327 <span class="keywordflow">return</span> d_indent;
00328 }
00329
<a name="l00340"></a><a class="code" href="class_qwt_push_button.html#a8">00340</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_push_button.html#a8">QwtPushButton::setIndent</a>(<span class="keywordtype">int</span> indent)
00341 {
00342 d_indent = indent;
00343 }
00344
<a name="l00352"></a><a class="code" href="class_qwt_push_button.html#a11">00352</a> <span class="keywordtype">int</span> <a class="code" href="class_qwt_push_button.html#a11">QwtPushButton::heightForWidth</a>(<span class="keywordtype">int</span> width)<span class="keyword"> const</span>
00353 <span class="keyword"></span>{
00354 <span class="keywordflow">if</span> ( pixmap() )
00355 <span class="keywordflow">return</span> QPushButton::heightForWidth(width);
00356
00357 <a class="code" href="class_qwt_text.html">QwtText</a> *txt = <a class="code" href="class_qwt_text.html#e0">QwtText::makeText</a>(text(), <a class="code" href="class_qwt_push_button.html#a5">usedTextFormat</a>(),
00358 d_alignment, font());
00359
00360 <span class="keywordtype">int</span> h = <a class="code" href="class_qwt_push_button.html#a10">sizeHint</a>().height();
00361 h -= txt-><a class="code" href="class_qwt_text.html#a17">boundingRect</a>().height();
00362 h += txt-><a class="code" href="class_qwt_text.html#a16">heightForWidth</a>(width);
00363
00364 <span class="keyword">delete</span> txt;
00365
00366 <span class="keywordflow">return</span> h;
00367 }
00368
<a name="l00370"></a><a class="code" href="class_qwt_push_button.html#a10">00370</a> QSize <a class="code" href="class_qwt_push_button.html#a10">QwtPushButton::sizeHint</a>()<span class="keyword"> const</span>
00371 <span class="keyword"></span>{
00372 QSize hint = QPushButton::sizeHint();
00373
00374 <span class="keywordflow">if</span> ( d_indent > 0 )
00375 {
00376 <span class="keywordflow">if</span> ( (d_alignment & Qt::AlignLeft)
00377 || (d_alignment & Qt::AlignRight) )
00378 {
00379 hint.setWidth(hint.width() + d_indent);
00380 }
00381 <span class="keywordflow">if</span> ( (d_alignment & Qt::AlignTop)
00382 || (d_alignment & Qt::AlignBottom) )
00383 {
00384 hint.setHeight(hint.height() + d_indent);
00385 }
00386 }
00387
00388 <span class="keywordflow">if</span> ( pixmap() )
00389 <span class="keywordflow">return</span> hint;
00390
00391 <span class="keyword">const</span> Qt::TextFormat <a class="code" href="class_qwt_push_button.html#a3">textFormat</a> = <a class="code" href="class_qwt_push_button.html#a5">usedTextFormat</a>();
00392 <span class="keywordflow">if</span> ( textFormat == Qt::RichText )
00393 {
00394 <a class="code" href="class_qwt_rich_text.html">QwtRichText</a> richText(text(), font(), d_alignment);
00395
00396 <span class="keyword">const</span> QSize sizeText = fontMetrics().size(Qt::ShowPrefix, text());
00397 <span class="keyword">const</span> QSize sizeRichText(richText.<a class="code" href="class_qwt_rich_text.html#a8">boundingRect</a>().size());
00398
00399 <span class="keywordtype">int</span> iconHeight = 0;
00400 <span class="keywordflow">if</span> ( iconSet() && !iconSet()->isNull() )
00401 {
00402 iconHeight = iconSet()->pixmap(QIconSet::Small,
00403 QIconSet::Normal).height();
00404 }
00405
00406 <span class="keyword">const</span> <span class="keywordtype">int</span> heightText = QMAX(iconHeight, sizeText.height());
00407 <span class="keyword">const</span> <span class="keywordtype">int</span> heightRichText = QMAX(iconHeight, sizeRichText.height());
00408
00409 hint.setWidth(hint.width() - sizeText.width() + sizeRichText.width());
00410 hint.setHeight(hint.height() - heightText + heightRichText);
00411 }
00412
00413 <span class="keywordflow">return</span> hint;
00414 }
00415
<a name="l00417"></a><a class="code" href="class_qwt_push_button.html#b0">00417</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_push_button.html#b0">QwtPushButton::drawButtonLabel</a>(QPainter *painter)
00418 {
00419 <span class="preprocessor">#ifndef QT_NO_PICTURE</span>
00420 <span class="preprocessor"></span> <span class="comment">// Unfortunately QStyle doesnt offer an API to add</span>
00421 <span class="comment">// the alignment and rich text features. But we dont want</span>
00422 <span class="comment">// to paint the button label on our own, as we would lose</span>
00423 <span class="comment">// the flexibility of the styles. So we let the style</span>
00424 <span class="comment">// paint the button label to a QPicture first, change</span>
00425 <span class="comment">// the paint commands and replay the manipulated commands</span>
00426 <span class="comment">// to the button.</span>
00427
00428 QwtPBPaintFilter paintFilter(<span class="keyword">this</span>);
00429
00430 QPainter picPainter(&paintFilter);
00431 picPainter.setFont(painter->font());
00432
00433 <span class="preprocessor">#if QT_VERSION >= 300</span>
00434 <span class="preprocessor"></span> <span class="comment">// When painting to QPicture the dotted line of the focus rect is</span>
00435 <span class="comment">// set to solid. ( 06.08.2003 )</span>
00436 <span class="comment">// So we dont set the Style_HasFocus flag and paint the focus rect</span>
00437 <span class="comment">// later directly to the button.</span>
00438
00439 QStyle::SFlags flags = QStyle::Style_Default;
00440 <span class="keywordflow">if</span> (isEnabled())
00441 flags |= QStyle::Style_Enabled;
00442 <span class="keywordflow">if</span> (isDown())
00443 flags |= QStyle::Style_Down;
00444 <span class="keywordflow">if</span> (isOn())
00445 flags |= QStyle::Style_On;
00446 <span class="keywordflow">if</span> (! isFlat() && ! isDown())
00447 flags |= QStyle::Style_Raised;
00448 <span class="keywordflow">if</span> (isDefault())
00449 flags |= QStyle::Style_ButtonDefault;
00450
00451 style().drawControl(QStyle::CE_PushButtonLabel, &picPainter, <span class="keyword">this</span>,
00452 style().subRect(QStyle::SR_PushButtonContents, <span class="keyword">this</span>),
00453 colorGroup(), flags);
00454 <span class="preprocessor">#else</span>
00455 <span class="preprocessor"></span> <span class="comment">// For Qt <= 2.x the focus rect is not painted in</span>
00456 <span class="comment">// drawButtonLabel. So we dont need a workaround here.</span>
00457
00458 QPushButton::drawButtonLabel(&picPainter);
00459 <span class="preprocessor">#endif</span>
00460 <span class="preprocessor"></span>
00461 picPainter.end();
00462
00463 paintFilter.play(painter);
00464
00465 <span class="preprocessor">#if QT_VERSION >= 300</span>
00466 <span class="preprocessor"></span> <span class="keywordflow">if</span> (hasFocus())
00467 {
00468 <span class="comment">// Paint the focus rect on top of the button label.</span>
00469
00470 flags |= QStyle::Style_HasFocus;
00471 style().drawPrimitive(QStyle::PE_FocusRect, painter,
00472 style().subRect(QStyle::SR_PushButtonFocusRect, <span class="keyword">this</span>),
00473 colorGroup(), flags);
00474 }
00475 <span class="preprocessor">#endif</span>
00476 <span class="preprocessor"></span>
00477 <span class="preprocessor">#else // QT_NO_PICTURE</span>
00478 <span class="preprocessor"></span> QPushButton::drawButtonLabel(painter);
00479 <span class="preprocessor">#endif</span>
00480 <span class="preprocessor"></span>}
00481
00482 <span class="comment">// Local Variables:</span>
00483 <span class="comment">// mode: C++</span>
00484 <span class="comment">// c-file-style: "stroustrup"</span>
00485 <span class="comment">// indent-tabs-mode: nil</span>
00486 <span class="comment">// End:</span>
</div></pre><hr size="1"><address style="align: right;"><small>Generated on Tue Nov 16 21:12:21 2004 for Qwt User's Guide by
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