class_qwt_widget_overlay.html 29.5 KB
Newer Older
xuebingbing's avatar
xuebingbing committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<meta name="generator" content="Doxygen 1.8.11"/>
<title>Qwt User&#39;s Guide: QwtWidgetOverlay Class Reference</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="navtree.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="resize.js"></script>
<script type="text/javascript" src="navtreedata.js"></script>
<script type="text/javascript" src="navtree.js"></script>
<script type="text/javascript">
  $(document).ready(initResizable);
  $(window).load(resizeHeight);
</script>
<link href="search/search.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="search/searchdata.js"></script>
<script type="text/javascript" src="search/search.js"></script>
<script type="text/javascript">
  $(document).ready(function() { init_search(); });
</script>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
 <tbody>
 <tr style="height: 56px;">
  <td id="projectalign" style="padding-left: 0.5em;">
   <div id="projectname">Qwt User&#39;s Guide
   &#160;<span id="projectnumber">6.1.3</span>
   </div>
  </td>
 </tr>
 </tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.8.11 -->
<script type="text/javascript">
var searchBox = new SearchBox("searchBox", "search",false,'Search');
</script>
  <div id="navrow1" class="tabs">
    <ul class="tablist">
      <li><a href="index.html"><span>Main&#160;Page</span></a></li>
      <li class="current"><a href="annotated.html"><span>Classes</span></a></li>
      <li>
        <div id="MSearchBox" class="MSearchBoxInactive">
        <span class="left">
          <img id="MSearchSelect" src="search/mag_sel.png"
               onmouseover="return searchBox.OnSearchSelectShow()"
               onmouseout="return searchBox.OnSearchSelectHide()"
               alt=""/>
          <input type="text" id="MSearchField" value="Search" accesskey="S"
               onfocus="searchBox.OnSearchFieldFocus(true)" 
               onblur="searchBox.OnSearchFieldFocus(false)" 
               onkeyup="searchBox.OnSearchFieldChange(event)"/>
          </span><span class="right">
            <a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="search/close.png" alt=""/></a>
          </span>
        </div>
      </li>
    </ul>
  </div>
  <div id="navrow2" class="tabs2">
    <ul class="tablist">
      <li><a href="annotated.html"><span>Class&#160;List</span></a></li>
      <li><a href="classes.html"><span>Class&#160;Index</span></a></li>
      <li><a href="inherits.html"><span>Class&#160;Hierarchy</span></a></li>
      <li><a href="functions.html"><span>Class&#160;Members</span></a></li>
    </ul>
  </div>
</div><!-- top -->
<div id="side-nav" class="ui-resizable side-nav-resizable">
  <div id="nav-tree">
    <div id="nav-tree-contents">
      <div id="nav-sync" class="sync"></div>
    </div>
  </div>
  <div id="splitbar" style="-moz-user-select:none;" 
       class="ui-resizable-handle">
  </div>
</div>
<script type="text/javascript">
$(document).ready(function(){initNavTree('class_qwt_widget_overlay.html','');});
</script>
<div id="doc-content">
<!-- window showing the filter options -->
<div id="MSearchSelectWindow"
     onmouseover="return searchBox.OnSearchSelectShow()"
     onmouseout="return searchBox.OnSearchSelectHide()"
     onkeydown="return searchBox.OnSearchSelectKey(event)">
</div>

<!-- iframe showing the search results (closed by default) -->
<div id="MSearchResultsWindow">
<iframe src="javascript:void(0)" frameborder="0" 
        name="MSearchResults" id="MSearchResults">
</iframe>
</div>

<div class="header">
  <div class="summary">
<a href="#pub-types">Public Types</a> &#124;
<a href="#pub-methods">Public Member Functions</a> &#124;
<a href="#pro-methods">Protected Member Functions</a> &#124;
<a href="class_qwt_widget_overlay-members.html">List of all members</a>  </div>
  <div class="headertitle">
<div class="title">QwtWidgetOverlay Class Reference<span class="mlabels"><span class="mlabel">abstract</span></span></div>  </div>
</div><!--header-->
<div class="contents">

<p>An overlay for a widget.  
 <a href="class_qwt_widget_overlay.html#details">More...</a></p>

<p><code>#include &lt;<a class="el" href="qwt__widget__overlay_8h_source.html">qwt_widget_overlay.h</a>&gt;</code></p>
<div class="dynheader">
Inheritance diagram for QwtWidgetOverlay:</div>
<div class="dyncontent">
<div class="center"><img src="class_qwt_widget_overlay__inherit__graph.png" border="0" usemap="#_qwt_widget_overlay_inherit__map" alt="Inheritance graph"/></div>
<map name="_qwt_widget_overlay_inherit__map" id="_qwt_widget_overlay_inherit__map">
</map>
<center><span class="legend">[<a target="top" href="graph_legend.html">legend</a>]</span></center></div>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-types"></a>
Public Types</h2></td></tr>
<tr class="memitem:a413679fb15e072d5a404f237062b75fc"><td class="memItemLeft" align="right" valign="top">enum &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_widget_overlay.html#a413679fb15e072d5a404f237062b75fc">MaskMode</a> { <a class="el" href="class_qwt_widget_overlay.html#a413679fb15e072d5a404f237062b75fca58d7a0858b0aa58407bf598c907636fd">NoMask</a>, 
<a class="el" href="class_qwt_widget_overlay.html#a413679fb15e072d5a404f237062b75fcaa3c2ba9dd41304c6a6524ee5f7c70540">MaskHint</a>, 
<a class="el" href="class_qwt_widget_overlay.html#a413679fb15e072d5a404f237062b75fca263c0fea842a8d4957ded6f5e47f734e">AlphaMask</a>
 }<tr class="memdesc:a413679fb15e072d5a404f237062b75fc"><td class="mdescLeft">&#160;</td><td class="mdescRight">Mask mode.  <a href="class_qwt_widget_overlay.html#a413679fb15e072d5a404f237062b75fc">More...</a><br /></td></tr>
</td></tr>
<tr class="separator:a413679fb15e072d5a404f237062b75fc"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aaa8358f3b841b733d69e62aa645783d8"><td class="memItemLeft" align="right" valign="top">enum &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_widget_overlay.html#aaa8358f3b841b733d69e62aa645783d8">RenderMode</a> { <a class="el" href="class_qwt_widget_overlay.html#aaa8358f3b841b733d69e62aa645783d8a831530722d8dc0e42aabfbcacbb6ecc6">AutoRenderMode</a>, 
<a class="el" href="class_qwt_widget_overlay.html#aaa8358f3b841b733d69e62aa645783d8a923e121c1d01bb72deb897a6f913aaf5">CopyAlphaMask</a>, 
<a class="el" href="class_qwt_widget_overlay.html#aaa8358f3b841b733d69e62aa645783d8ab4b3bfef277a5231f8632a6800a256d8">DrawOverlay</a>
 }<tr class="memdesc:aaa8358f3b841b733d69e62aa645783d8"><td class="mdescLeft">&#160;</td><td class="mdescRight">Render mode.  <a href="class_qwt_widget_overlay.html#aaa8358f3b841b733d69e62aa645783d8">More...</a><br /></td></tr>
</td></tr>
<tr class="separator:aaa8358f3b841b733d69e62aa645783d8"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:afeb3615cf79bee41bbae21f3b92b924d"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_widget_overlay.html#afeb3615cf79bee41bbae21f3b92b924d">QwtWidgetOverlay</a> (QWidget *)</td></tr>
<tr class="memdesc:afeb3615cf79bee41bbae21f3b92b924d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Constructor.  <a href="#afeb3615cf79bee41bbae21f3b92b924d">More...</a><br /></td></tr>
<tr class="separator:afeb3615cf79bee41bbae21f3b92b924d"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:af234383cb42288746b970fb3fa18395d"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="af234383cb42288746b970fb3fa18395d"></a>
virtual&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_widget_overlay.html#af234383cb42288746b970fb3fa18395d">~QwtWidgetOverlay</a> ()</td></tr>
<tr class="memdesc:af234383cb42288746b970fb3fa18395d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Destructor. <br /></td></tr>
<tr class="separator:af234383cb42288746b970fb3fa18395d"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a56828c036263679fc95087bd87496df0"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_widget_overlay.html#a56828c036263679fc95087bd87496df0">setMaskMode</a> (<a class="el" href="class_qwt_widget_overlay.html#a413679fb15e072d5a404f237062b75fc">MaskMode</a>)</td></tr>
<tr class="memdesc:a56828c036263679fc95087bd87496df0"><td class="mdescLeft">&#160;</td><td class="mdescRight">Specify how to find the mask for the overlay.  <a href="#a56828c036263679fc95087bd87496df0">More...</a><br /></td></tr>
<tr class="separator:a56828c036263679fc95087bd87496df0"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a161e7b6614b8e4ab0377eba9ce8a3f5a"><td class="memItemLeft" align="right" valign="top"><a class="el" href="class_qwt_widget_overlay.html#a413679fb15e072d5a404f237062b75fc">MaskMode</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_widget_overlay.html#a161e7b6614b8e4ab0377eba9ce8a3f5a">maskMode</a> () const </td></tr>
<tr class="separator:a161e7b6614b8e4ab0377eba9ce8a3f5a"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a80fd06e2111993848f45a21627ec09b4"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_widget_overlay.html#a80fd06e2111993848f45a21627ec09b4">setRenderMode</a> (<a class="el" href="class_qwt_widget_overlay.html#aaa8358f3b841b733d69e62aa645783d8">RenderMode</a>)</td></tr>
<tr class="separator:a80fd06e2111993848f45a21627ec09b4"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a33b227f98d26b0f1d4f2a0d5e9a6d99c"><td class="memItemLeft" align="right" valign="top"><a class="el" href="class_qwt_widget_overlay.html#aaa8358f3b841b733d69e62aa645783d8">RenderMode</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_widget_overlay.html#a33b227f98d26b0f1d4f2a0d5e9a6d99c">renderMode</a> () const </td></tr>
<tr class="separator:a33b227f98d26b0f1d4f2a0d5e9a6d99c"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a231231eebaf7655f8264d2ee2b03127c"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_widget_overlay.html#a231231eebaf7655f8264d2ee2b03127c">updateOverlay</a> ()</td></tr>
<tr class="separator:a231231eebaf7655f8264d2ee2b03127c"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a460de4766c71c6977478eddff3546066"><td class="memItemLeft" align="right" valign="top">virtual bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_widget_overlay.html#a460de4766c71c6977478eddff3546066">eventFilter</a> (QObject *, QEvent *)</td></tr>
<tr class="memdesc:a460de4766c71c6977478eddff3546066"><td class="mdescLeft">&#160;</td><td class="mdescRight">Event filter.  <a href="#a460de4766c71c6977478eddff3546066">More...</a><br /></td></tr>
<tr class="separator:a460de4766c71c6977478eddff3546066"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-methods"></a>
Protected Member Functions</h2></td></tr>
<tr class="memitem:ac75689d1294c175540253bb72ea70496"><td class="memItemLeft" align="right" valign="top">virtual void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_widget_overlay.html#ac75689d1294c175540253bb72ea70496">paintEvent</a> (QPaintEvent *event)</td></tr>
<tr class="separator:ac75689d1294c175540253bb72ea70496"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a1ec8de0015c9b823fd304d9febb580ca"><td class="memItemLeft" align="right" valign="top">virtual void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_widget_overlay.html#a1ec8de0015c9b823fd304d9febb580ca">resizeEvent</a> (QResizeEvent *event)</td></tr>
<tr class="separator:a1ec8de0015c9b823fd304d9febb580ca"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ad5c0592969220c56494be3034e5a83de"><td class="memItemLeft" align="right" valign="top">virtual QRegion&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_widget_overlay.html#ad5c0592969220c56494be3034e5a83de">maskHint</a> () const </td></tr>
<tr class="memdesc:ad5c0592969220c56494be3034e5a83de"><td class="mdescLeft">&#160;</td><td class="mdescRight">Calculate an approximation for the mask.  <a href="#ad5c0592969220c56494be3034e5a83de">More...</a><br /></td></tr>
<tr class="separator:ad5c0592969220c56494be3034e5a83de"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ac36e0ff0ac5de8a034af29ec4c2574ae"><td class="memItemLeft" align="right" valign="top">virtual void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_widget_overlay.html#ac36e0ff0ac5de8a034af29ec4c2574ae">drawOverlay</a> (QPainter *painter) const  =0</td></tr>
<tr class="separator:ac36e0ff0ac5de8a034af29ec4c2574ae"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>An overlay for a widget. </p>
<p>The main use case of an widget overlay is to avoid heavy repaint operation of the widget below.</p>
<p>F.e. in combination with the plot canvas an overlay avoid replots as the content of the canvas can be restored from its backing store.</p>
<p><a class="el" href="class_qwt_widget_overlay.html" title="An overlay for a widget. ">QwtWidgetOverlay</a> is an abstract base class. Deriving classes are supposed to reimplement the following methods:</p>
<ul>
<li><a class="el" href="class_qwt_widget_overlay.html#ac36e0ff0ac5de8a034af29ec4c2574ae">drawOverlay()</a></li>
<li><a class="el" href="class_qwt_widget_overlay.html#ad5c0592969220c56494be3034e5a83de" title="Calculate an approximation for the mask. ">maskHint()</a></li>
</ul>
<p>Internally <a class="el" href="class_qwt_plot_picker.html" title="QwtPlotPicker provides selections on a plot canvas. ">QwtPlotPicker</a> uses overlays for displaying the rubber band and the tracker text.</p>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_plot_canvas.html#a76066290edb594a71ee09be564563b0fa7b88a46e1414f6d904aa494c89d064f3" title="Paint double buffered reusing the content of the pixmap buffer when possible. ">QwtPlotCanvas::BackingStore</a> </dd></dl>
</div><h2 class="groupheader">Member Enumeration Documentation</h2>
<a class="anchor" id="a413679fb15e072d5a404f237062b75fc"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">enum <a class="el" href="class_qwt_widget_overlay.html#a413679fb15e072d5a404f237062b75fc">QwtWidgetOverlay::MaskMode</a></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Mask mode. </p>
<p>When using masks the widget below gets paint events for the masked regions of the overlay only. Otherwise Qt triggers full repaints. On less powerful hardware ( f.e embedded systems ) - or when using the raster paint engine on a remote desktop - bit blitting is a noticeable operation, that needs to be avoided.</p>
<p>If and how to mask depends on how expensive the calculation of the mask is and how many pixels can be excluded by the mask.</p>
<p>The default setting is MaskHint.</p>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_widget_overlay.html#a56828c036263679fc95087bd87496df0" title="Specify how to find the mask for the overlay. ">setMaskMode()</a>, <a class="el" href="class_qwt_widget_overlay.html#a161e7b6614b8e4ab0377eba9ce8a3f5a">maskMode()</a> </dd></dl>
<table class="fieldtable">
<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a class="anchor" id="a413679fb15e072d5a404f237062b75fca58d7a0858b0aa58407bf598c907636fd"></a>NoMask&#160;</td><td class="fielddoc">
<p>Don't use a mask. </p>
</td></tr>
<tr><td class="fieldname"><a class="anchor" id="a413679fb15e072d5a404f237062b75fcaa3c2ba9dd41304c6a6524ee5f7c70540"></a>MaskHint&#160;</td><td class="fielddoc">
<p>Use <a class="el" href="class_qwt_widget_overlay.html#ad5c0592969220c56494be3034e5a83de" title="Calculate an approximation for the mask. ">maskHint()</a> as mask. </p>
<p>For many situations a fast approximation is good enough and it is not necessary to build a more detailed mask ( f.e the bounding rectangle of a text ). </p>
</td></tr>
<tr><td class="fieldname"><a class="anchor" id="a413679fb15e072d5a404f237062b75fca263c0fea842a8d4957ded6f5e47f734e"></a>AlphaMask&#160;</td><td class="fielddoc">
<p>Calculate a mask by checking the alpha values. </p>
<p>Sometimes it is not possible to give a fast approximation and the mask needs to be calculated by drawing the overlay and testing the result.</p>
<p>When a valid <a class="el" href="class_qwt_widget_overlay.html#ad5c0592969220c56494be3034e5a83de" title="Calculate an approximation for the mask. ">maskHint()</a> is available only pixels inside this approximation are checked. </p>
</td></tr>
</table>

</div>
</div>
<a class="anchor" id="aaa8358f3b841b733d69e62aa645783d8"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">enum <a class="el" href="class_qwt_widget_overlay.html#aaa8358f3b841b733d69e62aa645783d8">QwtWidgetOverlay::RenderMode</a></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Render mode. </p>
<p>For calculating the alpha mask the overlay has already been painted to a temporary QImage. Instead of rendering the overlay twice this buffer can be copied for drawing the overlay.</p>
<p>On graphic systems using the raster paint engine ( QWS, Windows ) it means usually copying some memory only. On X11 it results in an expensive operation building a pixmap and for simple overlays it might not be recommended.</p>
<dl class="section note"><dt>Note</dt><dd>The render mode has no effect, when <a class="el" href="class_qwt_widget_overlay.html#a161e7b6614b8e4ab0377eba9ce8a3f5a">maskMode()</a> != AlphaMask. </dd></dl>
<table class="fieldtable">
<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a class="anchor" id="aaa8358f3b841b733d69e62aa645783d8a831530722d8dc0e42aabfbcacbb6ecc6"></a>AutoRenderMode&#160;</td><td class="fielddoc">
<p>Copy the buffer, when using the raster paint engine. </p>
</td></tr>
<tr><td class="fieldname"><a class="anchor" id="aaa8358f3b841b733d69e62aa645783d8a923e121c1d01bb72deb897a6f913aaf5"></a>CopyAlphaMask&#160;</td><td class="fielddoc">
<p>Always copy the buffer. </p>
</td></tr>
<tr><td class="fieldname"><a class="anchor" id="aaa8358f3b841b733d69e62aa645783d8ab4b3bfef277a5231f8632a6800a256d8"></a>DrawOverlay&#160;</td><td class="fielddoc">
<p>Never copy the buffer. </p>
</td></tr>
</table>

</div>
</div>
<h2 class="groupheader">Constructor &amp; Destructor Documentation</h2>
<a class="anchor" id="afeb3615cf79bee41bbae21f3b92b924d"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">QwtWidgetOverlay::QwtWidgetOverlay </td>
          <td>(</td>
          <td class="paramtype">QWidget *&#160;</td>
          <td class="paramname"><em>widget</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Constructor. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">widget</td><td>Parent widget, where the overlay is aligned to </td></tr>
  </table>
  </dd>
</dl>

</div>
</div>
<h2 class="groupheader">Member Function Documentation</h2>
<a class="anchor" id="ac36e0ff0ac5de8a034af29ec4c2574ae"></a>
<div class="memitem">
<div class="memproto">
<table class="mlabels">
  <tr>
  <td class="mlabels-left">
      <table class="memname">
        <tr>
          <td class="memname">virtual void QwtWidgetOverlay::drawOverlay </td>
          <td>(</td>
          <td class="paramtype">QPainter *&#160;</td>
          <td class="paramname"><em>painter</em></td><td>)</td>
          <td> const</td>
        </tr>
      </table>
  </td>
  <td class="mlabels-right">
<span class="mlabels"><span class="mlabel">protected</span><span class="mlabel">pure virtual</span></span>  </td>
  </tr>
</table>
</div><div class="memdoc">
<p>Draw the widget overlay </p><dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">painter</td><td>Painter </td></tr>
  </table>
  </dd>
</dl>

</div>
</div>
<a class="anchor" id="a460de4766c71c6977478eddff3546066"></a>
<div class="memitem">
<div class="memproto">
<table class="mlabels">
  <tr>
  <td class="mlabels-left">
      <table class="memname">
        <tr>
          <td class="memname">bool QwtWidgetOverlay::eventFilter </td>
          <td>(</td>
          <td class="paramtype">QObject *&#160;</td>
          <td class="paramname"><em>object</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">QEvent *&#160;</td>
          <td class="paramname"><em>event</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
  </td>
  <td class="mlabels-right">
<span class="mlabels"><span class="mlabel">virtual</span></span>  </td>
  </tr>
</table>
</div><div class="memdoc">

<p>Event filter. </p>
<p>Resize the overlay according to the size of the parent widget.</p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">object</td><td>Object to be filtered </td></tr>
    <tr><td class="paramname">event</td><td>Event</td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>See QObject::eventFilter() </dd></dl>

</div>
</div>
<a class="anchor" id="ad5c0592969220c56494be3034e5a83de"></a>
<div class="memitem">
<div class="memproto">
<table class="mlabels">
  <tr>
  <td class="mlabels-left">
      <table class="memname">
        <tr>
          <td class="memname">QRegion QwtWidgetOverlay::maskHint </td>
          <td>(</td>
          <td class="paramname"></td><td>)</td>
          <td> const</td>
        </tr>
      </table>
  </td>
  <td class="mlabels-right">
<span class="mlabels"><span class="mlabel">protected</span><span class="mlabel">virtual</span></span>  </td>
  </tr>
</table>
</div><div class="memdoc">

<p>Calculate an approximation for the mask. </p>
<ul>
<li>MaskHint The hint is used as mask.</li>
<li>AlphaMask The hint is used to speed up the algorithm for calculating a mask from non transparent pixels</li>
<li>NoMask The hint is unused.</li>
</ul>
<p>The default implementation returns an invalid region indicating no hint.</p>
<dl class="section return"><dt>Returns</dt><dd>Hint for the mask </dd></dl>

</div>
</div>
<a class="anchor" id="a161e7b6614b8e4ab0377eba9ce8a3f5a"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname"><a class="el" href="class_qwt_widget_overlay.html#a413679fb15e072d5a404f237062b75fc">QwtWidgetOverlay::MaskMode</a> QwtWidgetOverlay::maskMode </td>
          <td>(</td>
          <td class="paramname"></td><td>)</td>
          <td> const</td>
        </tr>
      </table>
</div><div class="memdoc">
<dl class="section return"><dt>Returns</dt><dd>Mode how to find the mask for the overlay </dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_widget_overlay.html#a56828c036263679fc95087bd87496df0" title="Specify how to find the mask for the overlay. ">setMaskMode()</a> </dd></dl>

</div>
</div>
<a class="anchor" id="ac75689d1294c175540253bb72ea70496"></a>
<div class="memitem">
<div class="memproto">
<table class="mlabels">
  <tr>
  <td class="mlabels-left">
      <table class="memname">
        <tr>
          <td class="memname">void QwtWidgetOverlay::paintEvent </td>
          <td>(</td>
          <td class="paramtype">QPaintEvent *&#160;</td>
          <td class="paramname"><em>event</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
  </td>
  <td class="mlabels-right">
<span class="mlabels"><span class="mlabel">protected</span><span class="mlabel">virtual</span></span>  </td>
  </tr>
</table>
</div><div class="memdoc">
<p>Paint event </p><dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">event</td><td>Paint event</td></tr>
  </table>
  </dd>
</dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_widget_overlay.html#ac36e0ff0ac5de8a034af29ec4c2574ae">drawOverlay()</a> </dd></dl>

</div>
</div>
<a class="anchor" id="a33b227f98d26b0f1d4f2a0d5e9a6d99c"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname"><a class="el" href="class_qwt_widget_overlay.html#aaa8358f3b841b733d69e62aa645783d8">QwtWidgetOverlay::RenderMode</a> QwtWidgetOverlay::renderMode </td>
          <td>(</td>
          <td class="paramname"></td><td>)</td>
          <td> const</td>
        </tr>
      </table>
</div><div class="memdoc">
<dl class="section return"><dt>Returns</dt><dd>Render mode </dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_widget_overlay.html#aaa8358f3b841b733d69e62aa645783d8" title="Render mode. ">RenderMode</a>, <a class="el" href="class_qwt_widget_overlay.html#a80fd06e2111993848f45a21627ec09b4">setRenderMode()</a> </dd></dl>

</div>
</div>
<a class="anchor" id="a1ec8de0015c9b823fd304d9febb580ca"></a>
<div class="memitem">
<div class="memproto">
<table class="mlabels">
  <tr>
  <td class="mlabels-left">
      <table class="memname">
        <tr>
          <td class="memname">void QwtWidgetOverlay::resizeEvent </td>
          <td>(</td>
          <td class="paramtype">QResizeEvent *&#160;</td>
          <td class="paramname"><em>event</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
  </td>
  <td class="mlabels-right">
<span class="mlabels"><span class="mlabel">protected</span><span class="mlabel">virtual</span></span>  </td>
  </tr>
</table>
</div><div class="memdoc">
<p>Resize event </p><dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">event</td><td>Resize event </td></tr>
  </table>
  </dd>
</dl>

</div>
</div>
<a class="anchor" id="a56828c036263679fc95087bd87496df0"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">void QwtWidgetOverlay::setMaskMode </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="class_qwt_widget_overlay.html#a413679fb15e072d5a404f237062b75fc">MaskMode</a>&#160;</td>
          <td class="paramname"><em>mode</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Specify how to find the mask for the overlay. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">mode</td><td>New mode </td></tr>
  </table>
  </dd>
</dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_widget_overlay.html#a161e7b6614b8e4ab0377eba9ce8a3f5a">maskMode()</a> </dd></dl>

</div>
</div>
<a class="anchor" id="a80fd06e2111993848f45a21627ec09b4"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">void QwtWidgetOverlay::setRenderMode </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="class_qwt_widget_overlay.html#aaa8358f3b841b733d69e62aa645783d8">RenderMode</a>&#160;</td>
          <td class="paramname"><em>mode</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">
<p>Set the render mode </p><dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">mode</td><td>Render mode</td></tr>
  </table>
  </dd>
</dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_widget_overlay.html#aaa8358f3b841b733d69e62aa645783d8" title="Render mode. ">RenderMode</a>, <a class="el" href="class_qwt_widget_overlay.html#a33b227f98d26b0f1d4f2a0d5e9a6d99c">renderMode()</a> </dd></dl>

</div>
</div>
<a class="anchor" id="a231231eebaf7655f8264d2ee2b03127c"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">void QwtWidgetOverlay::updateOverlay </td>
          <td>(</td>
          <td class="paramname"></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">
<p>Recalculate the mask and repaint the overlay </p>

</div>
</div>
</div><!-- contents -->
</div><!-- doc-content -->
<!-- start footer part -->
<div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
  <ul>
    <li class="navelem"><a class="el" href="class_qwt_widget_overlay.html">QwtWidgetOverlay</a></li>
    <li class="footer">Generated by
    <a href="http://www.doxygen.org/index.html">
    <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.11 </li>
  </ul>
</div>
</body>
</html>