xref: /aoo41x/main/cui/source/dialogs/about.cxx (revision b101caf5)
1 /**************************************************************
2  *
3  * Licensed to the Apache Software Foundation (ASF) under one
4  * or more contributor license agreements.  See the NOTICE file
5  * distributed with this work for additional information
6  * regarding copyright ownership.  The ASF licenses this file
7  * to you under the Apache License, Version 2.0 (the
8  * "License"); you may not use this file except in compliance
9  * with the License.  You may obtain a copy of the License at
10  *
11  *   http://www.apache.org/licenses/LICENSE-2.0
12  *
13  * Unless required by applicable law or agreed to in writing,
14  * software distributed under the License is distributed on an
15  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16  * KIND, either express or implied.  See the License for the
17  * specific language governing permissions and limitations
18  * under the License.
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20  *************************************************************/
21 
22 
23 
24 // MARKER(update_precomp.py): autogen include statement, do not remove
25 #include "precompiled_cui.hxx"
26 
27 #include <comphelper/processfactory.hxx>
28 #include <dialmgr.hxx>
29 #include <osl/file.hxx>
30 #include <rtl/bootstrap.hxx>
31 //#include <rtl/ustrbuf.hxx>
32 #include <sfx2/sfxcommands.h>
33 #include <sfx2/sfxdefs.hxx>
34 #include <sfx2/sfxuno.hxx>
35 #include <svtools/filter.hxx>
36 #include <svtools/svtools.hrc>
37 #include <tools/stream.hxx>
38 #include <tools/urlobj.hxx>
39 #include <unotools/bootstrap.hxx>
40 #include <unotools/configmgr.hxx>
41 #include <vcl/graph.hxx>
42 #include <vcl/imagerepository.hxx>
43 #include <vcl/msgbox.hxx>
44 #include <vcl/svapp.hxx>
45 #include <vcl/tabctrl.hxx>
46 #include <vcl/tabdlg.hxx>
47 #include <vcl/tabpage.hxx>
48 
49 #include <com/sun/star/system/SystemShellExecuteFlags.hpp>
50 #include <com/sun/star/system/SystemShellExecute.hpp>
51 #include <com/sun/star/uno/Any.h>
52 
53 #include "about.hxx"
54 #include "about.hrc"
55 
56 #define _STRINGIFY(x) #x
57 #define STRINGIFY(x) _STRINGIFY(x)
58 
59 /* On Windows/OS2, all the three files have .txt extension
60    and the README file name is in lowercase
61    Readme files are localized and have the locale in their file name:
62    README_de README_en-US
63 */
64 #if defined(WNT) || defined(OS2)
65 #define FILE_EXTENSION  ".txt"
66 #define README_FILE     "readme"
67 #else
68 #define FILE_EXTENSION
69 #define README_FILE     "README"
70 #endif
71 #define LICENSE_FILE    "LICENSE" FILE_EXTENSION
72 #define NOTICE_FILE     "NOTICE"  FILE_EXTENSION
73 
74 // Dir where the files are located
75 #define OOO_DIR_SHARE_README  "${OOO_BASE_DIR}/share/readme/"
76 
77 using namespace com::sun::star;
78 
79 namespace
80 {
81 
82     static void lcl_layoutFixedText( FixedText &rControl,
83                                      const Point& aPos,
84                                      Size &aSize,
85                                      const long nTextWidth )
86     {
87         aSize = rControl.GetSizePixel();
88         // change the width
89         aSize.Width() = nTextWidth;
90         // set Position and Size, to calculate the minimum size
91         // this will update the Height
92         rControl.SetPosSizePixel( aPos, aSize );
93         aSize = rControl.CalcMinimumSize();
94         // update the size with the right Height
95         rControl.SetSizePixel( aSize );
96     }
97 
98     static void lcl_layoutEdit( Edit &rControl,
99                                 const Point& aPos,
100                                 Size &aSize,
101                                 const long nTextWidth )
102     {
103         aSize = rControl.GetSizePixel();
104         // change the width
105         aSize.Width() = nTextWidth;
106         // set Position and Size, to calculate the minimum size
107         // this will update the Height
108         rControl.SetPosSizePixel( aPos, aSize );
109         aSize = rControl.CalcMinimumSize();
110         // update the size with the right Height
111         rControl.SetSizePixel( aSize );
112     }
113 
114     static  void lcl_readTxtFile( const rtl::OUString &rFile, rtl::OUString &sText )
115     {
116         rtl::OUString sFile( rFile );
117         rtl::Bootstrap::expandMacros( sFile );
118         osl::File aFile(sFile);
119         if ( aFile.open(OpenFlag_Read) == osl::FileBase::E_None )
120         {
121             osl::DirectoryItem aItem;
122             osl::DirectoryItem::get(sFile, aItem);
123 
124             osl::FileStatus aStatus(FileStatusMask_FileSize);
125             aItem.getFileStatus(aStatus);
126 
127             sal_uInt64 nBytesRead = 0;
128             sal_uInt64 nPosition = 0;
129             sal_uInt32 nBytes = (sal_uInt32)aStatus.getFileSize();
130 
131             sal_Char *pBuffer = new sal_Char[nBytes];
132 
133             while ( aFile.read( pBuffer + nPosition,
134                                 nBytes-nPosition,
135                                 nBytesRead ) == osl::FileBase::E_None
136                     && nPosition + nBytesRead < nBytes)
137             {
138                 nPosition += nBytesRead;
139             }
140 
141             OSL_ENSURE( nBytes < STRING_MAXLEN, "Text file has too much bytes!" );
142             if ( nBytes > STRING_MAXLEN )
143                 nBytes = STRING_MAXLEN - 1;
144 
145             sText = rtl::OUString( pBuffer,
146                                 nBytes,
147                                 RTL_TEXTENCODING_UTF8,
148                                 OSTRING_TO_OUSTRING_CVTFLAGS
149                                 | RTL_TEXTTOUNICODE_FLAGS_GLOBAL_SIGNATURE);
150             delete[] pBuffer;
151         }
152     }
153 
154     class ReadmeDialog;
155 
156     class ReadmeTabPage : public TabPage
157     {
158     private:
159         MultiLineEdit maText;
160         String        msText;
161 
162     public:
163         ReadmeTabPage(Window *pParent, const String &sText);
164         ~ReadmeTabPage();
165 
166         void Adjust(const Size &aSz, const Size &a6Size);
167     };
168 
169     ReadmeTabPage::ReadmeTabPage(Window *pParent, const String &sText)
170         : TabPage(pParent, CUI_RES( RID_CUI_README_TBPAGE))
171         ,maText( this, CUI_RES( RID_CUI_README_TBPAGE_EDIT ))
172         ,msText( sText )
173     {
174         FreeResource();
175 
176         maText.SetText(msText);
177         maText.Show();
178     }
179 
180     ReadmeTabPage::~ReadmeTabPage()
181     {
182     }
183 
184     void ReadmeTabPage::Adjust(const Size &aSz, const Size &a6Size)
185     {
186         long nDlgMargin  = a6Size.Width() * 2;
187         long nCtrlMargin = a6Size.Height() * 2;
188         maText.SetPosPixel( Point(a6Size.Width(), a6Size.Height()) );
189         maText.SetSizePixel( Size(aSz.Width() - nDlgMargin, aSz.Height() - nCtrlMargin) );
190     }
191 
192     class ReadmeDialog : public ModalDialog
193     {
194     private:
195         TabControl      maTabCtrl;
196         OKButton        maBtnOK;
197 
198         ReadmeTabPage  *maReadmeTabPage;
199         ReadmeTabPage  *maLicenseTabPage;
200         ReadmeTabPage  *maNoticeTabPage;
201 
202         DECL_LINK( ActivatePageHdl, TabControl * );
203         DECL_LINK( DeactivatePageHdl, TabControl * );
204 
205     public:
206         ReadmeDialog( Window* );
207         ~ReadmeDialog();
208     };
209 
210     ReadmeDialog::ReadmeDialog( Window * pParent )
211         : ModalDialog( pParent, CUI_RES( RID_CUI_README_DLG ) )
212         , maTabCtrl( this, CUI_RES(RID_CUI_README_TBCTL) )
213         , maBtnOK( this, CUI_RES(RID_CUI_README_OKBTN) )
214         , maReadmeTabPage(0)
215         , maLicenseTabPage(0)
216         , maNoticeTabPage(0)
217     {
218         FreeResource();
219 
220         maTabCtrl.Show();
221 
222         // Notice and License are not localized
223         const rtl::OUString sLicense( RTL_CONSTASCII_USTRINGPARAM( OOO_DIR_SHARE_README LICENSE_FILE ) );
224         const rtl::OUString sNotice( RTL_CONSTASCII_USTRINGPARAM(  OOO_DIR_SHARE_README NOTICE_FILE ) );
225 
226         // get localized README
227         rtl::OUStringBuffer aBuff;
228         lang::Locale aLocale = Application::GetSettings().GetUILocale();
229         aBuff.appendAscii( RTL_CONSTASCII_STRINGPARAM( OOO_DIR_SHARE_README README_FILE "_" ) );
230         aBuff.append( aLocale.Language );
231         if ( aLocale.Country.getLength() )
232         {
233             aBuff.append( sal_Unicode( '-') );
234             aBuff.append( aLocale.Country );
235             if ( aLocale.Variant.getLength() )
236             {
237                 aBuff.append( sal_Unicode( '-' ) );
238                 aBuff.append( aLocale.Variant );
239             }
240         }
241 #if defined(WNT) || defined(OS2)
242         aBuff.appendAscii( RTL_CONSTASCII_STRINGPARAM( FILE_EXTENSION ) );
243 #endif
244 
245         rtl::OUString sReadmeTxt, sLicenseTxt, sNoticeTxt;
246         lcl_readTxtFile( aBuff.makeStringAndClear(), sReadmeTxt );
247         lcl_readTxtFile( sLicense, sLicenseTxt );
248         lcl_readTxtFile( sNotice, sNoticeTxt );
249 
250         maReadmeTabPage = new ReadmeTabPage( &maTabCtrl, sReadmeTxt );
251         maLicenseTabPage = new ReadmeTabPage( &maTabCtrl, sLicenseTxt );
252         maNoticeTabPage = new ReadmeTabPage( &maTabCtrl, sNoticeTxt );
253 
254         maTabCtrl.SetTabPage( RID_CUI_READMEPAGE, maReadmeTabPage );
255         maTabCtrl.SetTabPage( RID_CUI_LICENSEPAGE, maLicenseTabPage );
256         maTabCtrl.SetTabPage( RID_CUI_NOTICEPAGE, maNoticeTabPage );
257 
258         maTabCtrl.SelectTabPage( RID_CUI_READMEPAGE );
259 
260         Size aTpSz  = maReadmeTabPage->GetOutputSizePixel();
261         Size a6Size = maReadmeTabPage->LogicToPixel( Size( 6, 6 ), MAP_APPFONT );
262 
263         maReadmeTabPage->Adjust( aTpSz, a6Size );
264         maLicenseTabPage->Adjust( aTpSz, a6Size );
265         maNoticeTabPage->Adjust( aTpSz, a6Size );
266 
267         Size aDlgSize = GetOutputSizePixel();
268         Size aOkBtnSz = maBtnOK.GetSizePixel();
269         Point aOKPnt( aDlgSize.Width() / 2 - aOkBtnSz.Width() / 2 , maBtnOK.GetPosPixel().Y() );
270         maBtnOK.SetPosPixel( aOKPnt );
271     }
272 
273     ReadmeDialog::~ReadmeDialog()
274     {
275         delete maReadmeTabPage;
276         delete maLicenseTabPage;
277         delete maNoticeTabPage;
278     }
279 }
280 
281 // -----------------------------------------------------------------------
282 
283 AboutDialog::AboutDialog( Window* pParent, const ResId  & rId ) :
284     SfxModalDialog( pParent, rId ),
285     maOKButton( this, ResId( RID_CUI_ABOUT_BTN_OK, *rId.GetResMgr() ) ),
286     maReadmeButton( this, ResId( RID_CUI_ABOUT_BTN_README, *rId.GetResMgr() ) ),
287     maVersionText( this, ResId( RID_CUI_ABOUT_FTXT_VERSION, *rId.GetResMgr() ) ),
288     maBuildInfoEdit( this, ResId( RID_CUI_ABOUT_FTXT_BUILDDATA, *rId.GetResMgr() ) ),
289     maCopyrightEdit( this, ResId( RID_CUI_ABOUT_FTXT_COPYRIGHT, *rId.GetResMgr() ) ),
290     maCreditsLink( this, ResId( RID_CUI_ABOUT_FTXT_WELCOME_LINK, *rId.GetResMgr() )  )
291 //    maCopyrightTextStr( ResId( RID_CUI_ABOUT_STR_COPYRIGHT, *rId.GetResMgr() ) )
292 {
293     bool bLoad = vcl::ImageRepository::loadBrandingImage(
294             rtl::OUString(RTL_CONSTASCII_USTRINGPARAM("about")),
295             maAppLogo );
296     OSL_ENSURE( bLoad, "Can't load about image");
297 
298     bLoad = vcl::ImageRepository::loadBrandingImage(
299             rtl::OUString(RTL_CONSTASCII_USTRINGPARAM("logo")),
300             maMainLogo );
301     OSL_ENSURE( bLoad, "Can't load logo image");
302 
303     const String vendor( ResId( RID_CUI_ABOUT_STR_COPYRIGHT_VENDOR, *rId.GetResMgr() ) );
304     String createdRes( ResId( RID_CUI_ABOUT_STR_CREATED, *rId.GetResMgr() ) );
305     if ( !vendor.EqualsAscii("Apache Software Foundation") ) {
306         createdRes = String( ResId( RID_CUI_ABOUT_STR_CREATED_VENDOR, *rId.GetResMgr() ));
307     }
308     const String copyrightAcknowledge( ResId( RID_CUI_ABOUT_STR_ACKNOWLEDGE, *rId.GetResMgr() ) );
309 
310     rtl::OUStringBuffer sbcopyright(250);
311     sbcopyright.appendAscii("Copyright ");
312     sbcopyright.append((sal_Unicode)0x00a9);
313     sbcopyright.appendAscii(" ");
314     rtl::OUString sYear( RTL_CONSTASCII_USTRINGPARAM("2015") );
315     if (vendor.EqualsAscii("Apache Software Foundation")) {
316         sbcopyright.append(sYear);
317         sbcopyright.appendAscii(" The Apache Software Foundation.\n\n");
318     } else {
319 #ifdef COPYRIGHT_YEAR
320         const rtl::OUString sDefYear( RTL_CONSTASCII_USTRINGPARAM( STRINGIFY( COPYRIGHT_YEAR ) ) );
321         if ( sDefYear.getLength() > 0 )
322         {
323             sYear = sDefYear;
324         }
325 #endif
326         sbcopyright.append(sYear);
327         sbcopyright.appendAscii(" ");
328         sbcopyright.append(vendor);
329         sbcopyright.appendAscii(".\nPortion copyright The Apache Software Foundation.\n\n");
330     }
331     sbcopyright.append( createdRes );
332     sbcopyright.appendAscii("\n\n");
333     sbcopyright.append( copyrightAcknowledge );
334     maCopyrightTextStr = sbcopyright.makeStringAndClear();
335 
336     InitControls();
337 
338     // set links
339     maReadmeButton.SetClickHdl( LINK( this, AboutDialog, ShowReadme_Impl ) );
340     maCreditsLink.SetClickHdl( LINK( this, AboutDialog, OpenLinkHdl_Impl ) );
341 
342     FreeResource();
343 
344     SetHelpId( CMD_SID_ABOUT );
345 }
346 
347 // -----------------------------------------------------------------------
348 
349 AboutDialog::~AboutDialog()
350 {
351 }
352 
353 // -----------------------------------------------------------------------
354 
355 void AboutDialog::InitControls()
356 {
357     // apply font, background et al.
358     ApplyStyleSettings();
359 
360     // set strings
361     maCopyrightEdit.SetText( maCopyrightTextStr );
362     maBuildInfoEdit.SetText( GetBuildVersionString() );
363     maCreditsLink.SetURL( maCreditsLink.GetText() );
364 
365     // determine size and position of the dialog & elements
366     Size aDlgSize;
367     LayoutControls( aDlgSize );
368 
369     // Change the width of the dialog
370     SetOutputSizePixel( aDlgSize );
371 }
372 
373 // -----------------------------------------------------------------------
374 
375 void AboutDialog::ApplyStyleSettings()
376 {
377     // Transparenter Font
378     Font aFont = GetFont();
379     aFont.SetTransparent( sal_True );
380     SetFont( aFont );
381 
382     // set for background and text the correct system color
383     const StyleSettings& rSettings = GetSettings().GetStyleSettings();
384     Color aWindowColor( rSettings.GetWindowColor() );
385     Wallpaper aWall( aWindowColor );
386     SetBackground( aWall );
387 
388     Font aNewFont( maCopyrightEdit.GetFont() );
389     aNewFont.SetTransparent( sal_True );
390 
391     maVersionText.SetFont( aNewFont );
392     maCopyrightEdit.SetFont( aNewFont );
393 
394     maVersionText.SetBackground(aWall);
395     maCopyrightEdit.SetBackground(aWall);
396     maBuildInfoEdit.SetBackground(aWall);
397     maCreditsLink.SetBackground(aWall);
398 
399     Color aTextColor( rSettings.GetWindowTextColor() );
400     maVersionText.SetControlForeground( aTextColor );
401     maCopyrightEdit.SetControlForeground( aTextColor );
402     maBuildInfoEdit.SetControlForeground( aTextColor );
403     maCreditsLink.SetControlForeground();
404 
405     Size aSmaller = aNewFont.GetSize();
406     aSmaller.Width() = (long) (aSmaller.Width() * 0.75);
407     aSmaller.Height() = (long) (aSmaller.Height() * 0.75);
408     aNewFont.SetSize( aSmaller );
409 
410     maBuildInfoEdit.SetFont( aNewFont );
411 
412     // the following is a hack to force the MultiLineEdit update its settings
413     // in order to reflect the Font
414     // See
415     //      Window::SetControlFont
416     //      MultiLineEdit::StateChanged
417     //      MultiLineEdit::ImplInitSettings
418     // TODO Override SetFont in MultiLineEdit and do the following,
419     // otherwise SetFont has no effect at all!
420     aSmaller = PixelToLogic( aSmaller, MAP_POINT );
421     aNewFont.SetSize( aSmaller );
422     maBuildInfoEdit.SetControlFont( aNewFont );
423 }
424 
425 // -----------------------------------------------------------------------
426 
427 void AboutDialog::LayoutControls( Size& aDlgSize )
428 {
429     Size aMainLogoSz = maMainLogo.GetSizePixel();
430     Size aAppLogoSiz = maAppLogo.GetSizePixel();
431 
432     aDlgSize = GetOutputSizePixel();
433     long nCol1 = aMainLogoSz.Width();
434     long nCol2 = aAppLogoSiz.Width() ? aAppLogoSiz.Width() : aDlgSize.Width();
435 
436     Size a6Size      = maVersionText.LogicToPixel( Size( 6, 6 ), MAP_APPFONT );
437     long nDlgMargin  = a6Size.Width() * 2;
438     long nCtrlMargin = a6Size.Height() * 2;
439     long nTextWidth  = nCol2 - nDlgMargin;
440     long nY          = aAppLogoSiz.Height() + a6Size.Height();
441 
442     aDlgSize.Width() = nCol1 + a6Size.Width() + nCol2;
443 
444     Point aPos( nCol1 + a6Size.Width(), nY );
445     Size aSize;
446     // layout fixed text control
447     lcl_layoutFixedText( maVersionText, aPos, aSize, nTextWidth );
448     nY += aSize.Height() + a6Size.Height();
449 
450     // Multiline edit with Build info
451     aPos.Y() = nY;
452     lcl_layoutEdit( maBuildInfoEdit, aPos, aSize, nTextWidth );
453     nY += aSize.Height() + a6Size.Height();
454 
455     // Multiline edit with Copyright-Text
456     aPos.Y() = nY;
457     lcl_layoutEdit( maCopyrightEdit, aPos, aSize, nTextWidth );
458     nY += aSize.Height() + a6Size.Height();
459 
460     // Hyperlink
461     aPos.Y() = nY;
462     lcl_layoutFixedText( maCreditsLink, aPos, aSize, nTextWidth );
463     nY += aSize.Height();
464 
465     nY = std::max( nY, aMainLogoSz.Height() );
466     nY += nCtrlMargin;
467 
468     // logos position
469     maMainLogoPos = Point( 0, nY / 2 - aMainLogoSz.Height() / 2 );
470     maAppLogoPos = Point( nCol1 + a6Size.Width(), 0 );
471 
472     // OK-Button-Position (at the bottom and centered)
473     Size aOKSiz = maOKButton.GetSizePixel();
474     Point aOKPnt( ( aDlgSize.Width() - aOKSiz.Width() ) - a6Size.Width(), nY );
475     maOKButton.SetPosPixel( aOKPnt );
476 
477     maReadmeButton.SetPosPixel( Point(a6Size.Width(), nY) );
478 
479     aDlgSize.Height() = aOKPnt.Y() + aOKSiz.Height() + a6Size.Width();
480 }
481 
482 // -----------------------------------------------------------------------
483 
484 const rtl::OUString AboutDialog::GetBuildId() const
485 {
486     rtl::OUString sDefault;
487 
488     // Get buildid from version[rc|.ini]
489     rtl::OUString sBuildId( utl::Bootstrap::getBuildIdData( sDefault ) );
490     OSL_ENSURE( sBuildId.getLength() > 0, "No BUILDID in bootstrap file" );
491     rtl::OUStringBuffer sBuildIdBuff( sBuildId );
492 
493     // Get ProductSource from version[rc|.ini]
494     rtl::OUString sProductSource( utl::Bootstrap::getProductSource( sDefault ) );
495     OSL_ENSURE( sProductSource.getLength() > 0, "No ProductSource in bootstrap file" );
496 
497     // the product source is something like "AOO340",
498     // while the build id is something like "340m1(Build:9590)"
499     // For better readability, strip the duplicate ProductMajor ("340").
500     if ( sProductSource.getLength() )
501     {
502         bool bMatchingUPD =
503                 ( sProductSource.getLength() >= 3 )
504             &&  ( sBuildId.getLength() >= 3 )
505             &&  ( sProductSource.copy( sProductSource.getLength() - 3 ) == sBuildId.copy( 0, 3 ) );
506         OSL_ENSURE( bMatchingUPD, "BUILDID and ProductSource do not match in their UPD" );
507         if ( bMatchingUPD )
508             sProductSource = sProductSource.copy( 0, sProductSource.getLength() - 3 );
509 
510         // prepend the product source
511         sBuildIdBuff.insert( 0, sProductSource );
512     }
513 
514     return sBuildIdBuff.makeStringAndClear();
515 }
516 
517 // -----------------------------------------------------------------------
518 
519 const rtl::OUString AboutDialog::GetBuildVersionString() const
520 {
521     rtl::OUStringBuffer aBuildString( GetBuildId() );
522     rtl::OUString sRevision( utl::Bootstrap::getRevisionInfo() );
523 
524     if ( sRevision.getLength() > 0 )
525     {
526         aBuildString.appendAscii( RTL_CONSTASCII_STRINGPARAM( "  -  Rev. " ) );
527         aBuildString.append( sRevision );
528     }
529 
530 #ifdef BUILD_VER_STRING
531     rtl::OUString sBuildVer( RTL_CONSTASCII_USTRINGPARAM( STRINGIFY( BUILD_VER_STRING ) ) );
532     if ( sBuildVer.getLength() > 0 )
533     {
534         aBuildString.append( sal_Unicode( '\n' ) );
535         aBuildString.append( sBuildVer );
536     }
537 #endif
538 
539     return aBuildString.makeStringAndClear();
540 }
541 
542 // -----------------------------------------------------------------------
543 
544 sal_Bool AboutDialog::Close()
545 {
546     EndDialog( RET_OK );
547     return( sal_False );
548 }
549 
550 // -----------------------------------------------------------------------
551 
552 void AboutDialog::Paint( const Rectangle& rRect )
553 {
554     SetClipRegion( rRect );
555 
556     // workaround to ensure that the background is painted correct
557     // on MacOS for exmaple the background was grey and the image and other controls white
558     SetFillColor(GetSettings().GetStyleSettings().GetWindowColor());
559     SetLineColor();
560     DrawRect(rRect);
561 
562     DrawImage( maMainLogoPos, maMainLogo );
563     DrawImage( maAppLogoPos, maAppLogo );
564 
565     return;
566 }
567 
568 // -----------------------------------------------------------------------
569 
570 IMPL_LINK ( AboutDialog, OpenLinkHdl_Impl, svt::FixedHyperlink*, EMPTYARG )
571 {
572     ::rtl::OUString sURL( maCreditsLink.GetURL() );
573     if ( sURL.getLength() > 0 )
574     {
575         try
576         {
577             uno::Reference< com::sun::star::system::XSystemShellExecute > xSystemShell(
578                 com::sun::star::system::SystemShellExecute::create(
579                     ::comphelper::getProcessComponentContext() ) );
580             if ( xSystemShell.is() )
581                 xSystemShell->execute( sURL, rtl::OUString(), com::sun::star::system::SystemShellExecuteFlags::DEFAULTS );
582         }
583         catch( const uno::Exception& e )
584         {
585              OSL_TRACE( "Caught exception: %s\n thread terminated.\n",
586                 rtl::OUStringToOString(e.Message, RTL_TEXTENCODING_UTF8).getStr());
587         }
588     }
589 
590     return 0;
591 }
592 
593 IMPL_LINK ( AboutDialog, ShowReadme_Impl, PushButton*, EMPTYARG )
594 {
595     ReadmeDialog aDlg( this );
596     aDlg.Execute();
597 
598     return 0;
599 }
600