class_qwt_widget_overlay.html
29.5 KB
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
<!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 1.8.3.1"/>
<title>Qwt User'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="search/search.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="search/search.js"></script>
<script type="text/javascript">
$(document).ready(function() { searchBox.OnSelectItem(0); });
</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 style="padding-left: 0.5em;">
<div id="projectname">Qwt User's Guide
 <span id="projectnumber">6.1-rc3</span>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.8.3.1 -->
<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 Page</span></a></li>
<li><a href="pages.html"><span>Related Pages</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 List</span></a></li>
<li><a href="classes.html"><span>Class Index</span></a></li>
<li><a href="inherits.html"><span>Class Hierarchy</span></a></li>
<li><a href="functions.html"><span>Class Members</span></a></li>
</ul>
</div>
<!-- window showing the filter options -->
<div id="MSearchSelectWindow"
onmouseover="return searchBox.OnSearchSelectShow()"
onmouseout="return searchBox.OnSearchSelectHide()"
onkeydown="return searchBox.OnSearchSelectKey(event)">
<a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark"> </span>All</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(1)"><span class="SelectionMark"> </span>Classes</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(2)"><span class="SelectionMark"> </span>Functions</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(3)"><span class="SelectionMark"> </span>Variables</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(4)"><span class="SelectionMark"> </span>Typedefs</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(5)"><span class="SelectionMark"> </span>Enumerations</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark"> </span>Enumerator</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(7)"><span class="SelectionMark"> </span>Pages</a></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><!-- top -->
<div class="header">
<div class="summary">
<a href="#pub-types">Public Types</a> |
<a href="#pub-methods">Public Member Functions</a> |
<a href="#pro-methods">Protected Member Functions</a> |
<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 <<a class="el" href="qwt__widget__overlay_8h_source.html">qwt_widget_overlay.h</a>></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 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  </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>
}</td></tr>
<tr class="memdesc:a413679fb15e072d5a404f237062b75fc"><td class="mdescLeft"> </td><td class="mdescRight">Mask mode. <a href="class_qwt_widget_overlay.html#a413679fb15e072d5a404f237062b75fc">More...</a><br/></td></tr>
<tr class="separator:a413679fb15e072d5a404f237062b75fc"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aaa8358f3b841b733d69e62aa645783d8"><td class="memItemLeft" align="right" valign="top">enum  </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>
}</td></tr>
<tr class="memdesc:aaa8358f3b841b733d69e62aa645783d8"><td class="mdescLeft"> </td><td class="mdescRight">Render mode. <a href="class_qwt_widget_overlay.html#aaa8358f3b841b733d69e62aa645783d8">More...</a><br/></td></tr>
<tr class="separator:aaa8358f3b841b733d69e62aa645783d8"><td class="memSeparator" colspan="2"> </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"> </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"> </td><td class="mdescRight">Constructor. <a href="#afeb3615cf79bee41bbae21f3b92b924d">More...</a><br/></td></tr>
<tr class="separator:afeb3615cf79bee41bbae21f3b92b924d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:af234383cb42288746b970fb3fa18395d"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="af234383cb42288746b970fb3fa18395d"></a>
virtual </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"> </td><td class="mdescRight">Destructor. <br/></td></tr>
<tr class="separator:af234383cb42288746b970fb3fa18395d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a56828c036263679fc95087bd87496df0"><td class="memItemLeft" align="right" valign="top">void </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"> </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"> </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> </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"> </td></tr>
<tr class="memitem:a80fd06e2111993848f45a21627ec09b4"><td class="memItemLeft" align="right" valign="top">void </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"> </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> </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"> </td></tr>
<tr class="memitem:a231231eebaf7655f8264d2ee2b03127c"><td class="memItemLeft" align="right" valign="top">void </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"> </td></tr>
<tr class="memitem:a460de4766c71c6977478eddff3546066"><td class="memItemLeft" align="right" valign="top">virtual bool </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"> </td><td class="mdescRight">Event filter. <a href="#a460de4766c71c6977478eddff3546066">More...</a><br/></td></tr>
<tr class="separator:a460de4766c71c6977478eddff3546066"><td class="memSeparator" colspan="2"> </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 </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"> </td></tr>
<tr class="memitem:a1ec8de0015c9b823fd304d9febb580ca"><td class="memItemLeft" align="right" valign="top">virtual void </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"> </td></tr>
<tr class="memitem:ad5c0592969220c56494be3034e5a83de"><td class="memItemLeft" align="right" valign="top">virtual QRegion </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"> </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"> </td></tr>
<tr class="memitem:abb69235d3eba71b6dde354c668dd2611"><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_widget_overlay.html#abb69235d3eba71b6dde354c668dd2611">drawOverlay</a> (QPainter *painter) const =0</td></tr>
<tr class="separator:abb69235d3eba71b6dde354c668dd2611"><td class="memSeparator" colspan="2"> </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#abb69235d3eba71b6dde354c668dd2611">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"><em><a class="anchor" id="a413679fb15e072d5a404f237062b75fca58d7a0858b0aa58407bf598c907636fd"></a>NoMask</em> </td><td class="fielddoc">
<p>Don't use a mask. </p>
</td></tr>
<tr><td class="fieldname"><em><a class="anchor" id="a413679fb15e072d5a404f237062b75fcaa3c2ba9dd41304c6a6524ee5f7c70540"></a>MaskHint</em> </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"><em><a class="anchor" id="a413679fb15e072d5a404f237062b75fca263c0fea842a8d4957ded6f5e47f734e"></a>AlphaMask</em> </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"><em><a class="anchor" id="aaa8358f3b841b733d69e62aa645783d8a831530722d8dc0e42aabfbcacbb6ecc6"></a>AutoRenderMode</em> </td><td class="fielddoc">
<p>Copy the buffer, when using the raster paint engine. </p>
</td></tr>
<tr><td class="fieldname"><em><a class="anchor" id="aaa8358f3b841b733d69e62aa645783d8a923e121c1d01bb72deb897a6f913aaf5"></a>CopyAlphaMask</em> </td><td class="fielddoc">
<p>Always copy the buffer. </p>
</td></tr>
<tr><td class="fieldname"><em><a class="anchor" id="aaa8358f3b841b733d69e62aa645783d8ab4b3bfef277a5231f8632a6800a256d8"></a>DrawOverlay</em> </td><td class="fielddoc">
<p>Never copy the buffer. </p>
</td></tr>
</table>
</div>
</div>
<h2 class="groupheader">Constructor & 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 * </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="abb69235d3eba71b6dde354c668dd2611"></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 * </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 * </td>
<td class="paramname"><em>object</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">QEvent * </td>
<td class="paramname"><em>event</em> </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>
</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>
</ul>
<ul>
<li>AlphaMask The hint is used to speed up the algorithm for calculating a mask from non transparent pixels</li>
</ul>
<ul>
<li>NoMask The hint is unused.</li>
</ul>
<p>The default implementation returns an invalid region indicating no hint. </p>
</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 * </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#abb69235d3eba71b6dde354c668dd2611">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 * </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> </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> </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 -->
<!-- start footer part -->
<hr class="footer"/><address class="footer"><small>
Generated by  <a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/>
</a> 1.8.3.1
</small></address>
</body>
</html>