xref: /aoo41x/main/cui/source/dialogs/about.cxx (revision 85cfe422)
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
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8  * "License"); you may not use this file except in compliance
9  * with the License.  You may obtain a copy of the License at
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11  *   http://www.apache.org/licenses/LICENSE-2.0
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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 // TODO:
315 //   This date needs to be updated each year... do this automagically
316 //
317     rtl::OUString sYear( RTL_CONSTASCII_USTRINGPARAM("2021") );
318     if (vendor.EqualsAscii("Apache Software Foundation")) {
319         sbcopyright.append(sYear);
320         sbcopyright.appendAscii(" The Apache Software Foundation.\n\n");
321     } else {
322 #ifdef COPYRIGHT_YEAR
323         const rtl::OUString sDefYear( RTL_CONSTASCII_USTRINGPARAM( STRINGIFY( COPYRIGHT_YEAR ) ) );
324         if ( sDefYear.getLength() > 0 )
325         {
326             sYear = sDefYear;
327         }
328 #endif
329         sbcopyright.append(sYear);
330         sbcopyright.appendAscii(" ");
331         sbcopyright.append(vendor);
332         sbcopyright.appendAscii(".\nPortion copyright The Apache Software Foundation.\n\n");
333     }
334     sbcopyright.append( createdRes );
335     sbcopyright.appendAscii("\n\n");
336     sbcopyright.append( copyrightAcknowledge );
337     maCopyrightTextStr = sbcopyright.makeStringAndClear();
338 
339     InitControls();
340 
341     // set links
342     maReadmeButton.SetClickHdl( LINK( this, AboutDialog, ShowReadme_Impl ) );
343     maCreditsLink.SetClickHdl( LINK( this, AboutDialog, OpenLinkHdl_Impl ) );
344 
345     FreeResource();
346 
347     SetHelpId( CMD_SID_ABOUT );
348 }
349 
350 // -----------------------------------------------------------------------
351 
352 AboutDialog::~AboutDialog()
353 {
354 }
355 
356 // -----------------------------------------------------------------------
357 
358 void AboutDialog::InitControls()
359 {
360     // apply font, background et al.
361     ApplyStyleSettings();
362 
363     // set strings
364     maCopyrightEdit.SetText( maCopyrightTextStr );
365     maBuildInfoEdit.SetText( GetBuildVersionString() );
366     maCreditsLink.SetURL( maCreditsLink.GetText() );
367 
368     // determine size and position of the dialog & elements
369     Size aDlgSize;
370     LayoutControls( aDlgSize );
371 
372     // Change the width of the dialog
373     SetOutputSizePixel( aDlgSize );
374 }
375 
376 // -----------------------------------------------------------------------
377 
378 void AboutDialog::ApplyStyleSettings()
379 {
380     // Transparenter Font
381     Font aFont = GetFont();
382     aFont.SetTransparent( sal_True );
383     SetFont( aFont );
384 
385     // set for background and text the correct system color
386     const StyleSettings& rSettings = GetSettings().GetStyleSettings();
387     Color aWindowColor( rSettings.GetWindowColor() );
388     Wallpaper aWall( aWindowColor );
389     SetBackground( aWall );
390 
391     Font aNewFont( maCopyrightEdit.GetFont() );
392     aNewFont.SetTransparent( sal_True );
393 
394     maVersionText.SetFont( aNewFont );
395     maCopyrightEdit.SetFont( aNewFont );
396 
397     maVersionText.SetBackground(aWall);
398     maCopyrightEdit.SetBackground(aWall);
399     maBuildInfoEdit.SetBackground(aWall);
400     maCreditsLink.SetBackground(aWall);
401 
402     Color aTextColor( rSettings.GetWindowTextColor() );
403     maVersionText.SetControlForeground( aTextColor );
404     maCopyrightEdit.SetControlForeground( aTextColor );
405     maBuildInfoEdit.SetControlForeground( aTextColor );
406     maCreditsLink.SetControlForeground();
407 
408     Size aSmaller = aNewFont.GetSize();
409     aSmaller.Width() = (long) (aSmaller.Width() * 0.75);
410     aSmaller.Height() = (long) (aSmaller.Height() * 0.75);
411     aNewFont.SetSize( aSmaller );
412 
413     maBuildInfoEdit.SetFont( aNewFont );
414 
415     // the following is a hack to force the MultiLineEdit update its settings
416     // in order to reflect the Font
417     // See
418     //      Window::SetControlFont
419     //      MultiLineEdit::StateChanged
420     //      MultiLineEdit::ImplInitSettings
421     // TODO Override SetFont in MultiLineEdit and do the following,
422     // otherwise SetFont has no effect at all!
423     aSmaller = PixelToLogic( aSmaller, MAP_POINT );
424     aNewFont.SetSize( aSmaller );
425     maBuildInfoEdit.SetControlFont( aNewFont );
426 }
427 
428 // -----------------------------------------------------------------------
429 
430 void AboutDialog::LayoutControls( Size& aDlgSize )
431 {
432     Size aMainLogoSz = maMainLogo.GetSizePixel();
433     Size aAppLogoSiz = maAppLogo.GetSizePixel();
434 
435     aDlgSize = GetOutputSizePixel();
436     long nCol1 = aMainLogoSz.Width();
437     long nCol2 = aAppLogoSiz.Width() ? aAppLogoSiz.Width() : aDlgSize.Width();
438 
439     Size a6Size      = maVersionText.LogicToPixel( Size( 6, 6 ), MAP_APPFONT );
440     long nDlgMargin  = a6Size.Width() * 2;
441     long nCtrlMargin = a6Size.Height() * 2;
442     long nTextWidth  = nCol2 - nDlgMargin;
443     long nY          = aAppLogoSiz.Height() + a6Size.Height();
444 
445     aDlgSize.Width() = nCol1 + a6Size.Width() + nCol2;
446 
447     Point aPos( nCol1 + a6Size.Width(), nY );
448     Size aSize;
449     // layout fixed text control
450     lcl_layoutFixedText( maVersionText, aPos, aSize, nTextWidth );
451     nY += aSize.Height() + a6Size.Height();
452 
453     // Multiline edit with Build info
454     aPos.Y() = nY;
455     lcl_layoutEdit( maBuildInfoEdit, aPos, aSize, nTextWidth );
456     nY += aSize.Height() + a6Size.Height();
457 
458     // Multiline edit with Copyright-Text
459     aPos.Y() = nY;
460     lcl_layoutEdit( maCopyrightEdit, aPos, aSize, nTextWidth );
461     nY += aSize.Height() + a6Size.Height();
462 
463     // Hyperlink
464     aPos.Y() = nY;
465     lcl_layoutFixedText( maCreditsLink, aPos, aSize, nTextWidth );
466     nY += aSize.Height();
467 
468     nY = std::max( nY, aMainLogoSz.Height() );
469     nY += nCtrlMargin;
470 
471     // logos position
472     maMainLogoPos = Point( 0, nY / 2 - aMainLogoSz.Height() / 2 );
473     maAppLogoPos = Point( nCol1 + a6Size.Width(), 0 );
474 
475     // OK-Button-Position (at the bottom and centered)
476     Size aOKSiz = maOKButton.GetSizePixel();
477     Point aOKPnt( ( aDlgSize.Width() - aOKSiz.Width() ) - a6Size.Width(), nY );
478     maOKButton.SetPosPixel( aOKPnt );
479 
480     maReadmeButton.SetPosPixel( Point(a6Size.Width(), nY) );
481 
482     aDlgSize.Height() = aOKPnt.Y() + aOKSiz.Height() + a6Size.Width();
483 }
484 
485 // -----------------------------------------------------------------------
486 
487 const rtl::OUString AboutDialog::GetBuildId() const
488 {
489     rtl::OUString sDefault;
490 
491     // Get buildid from version[rc|.ini]
492     rtl::OUString sBuildId( utl::Bootstrap::getBuildIdData( sDefault ) );
493     OSL_ENSURE( sBuildId.getLength() > 0, "No BUILDID in bootstrap file" );
494     rtl::OUStringBuffer sBuildIdBuff( sBuildId );
495 
496     // Get ProductSource from version[rc|.ini]
497     rtl::OUString sProductSource( utl::Bootstrap::getProductSource( sDefault ) );
498     OSL_ENSURE( sProductSource.getLength() > 0, "No ProductSource in bootstrap file" );
499 
500     // the product source is something like "AOO340",
501     // while the build id is something like "340m1(Build:9590)"
502     // For better readability, strip the duplicate ProductMajor ("340").
503     if ( sProductSource.getLength() )
504     {
505         bool bMatchingUPD =
506                 ( sProductSource.getLength() >= 3 )
507             &&  ( sBuildId.getLength() >= 3 )
508             &&  ( sProductSource.copy( sProductSource.getLength() - 3 ) == sBuildId.copy( 0, 3 ) );
509         OSL_ENSURE( bMatchingUPD, "BUILDID and ProductSource do not match in their UPD" );
510         if ( bMatchingUPD )
511             sProductSource = sProductSource.copy( 0, sProductSource.getLength() - 3 );
512 
513         // prepend the product source
514         sBuildIdBuff.insert( 0, sProductSource );
515     }
516 
517     return sBuildIdBuff.makeStringAndClear();
518 }
519 
520 // -----------------------------------------------------------------------
521 
522 const rtl::OUString AboutDialog::GetBuildVersionString() const
523 {
524     rtl::OUStringBuffer aBuildString( GetBuildId() );
525     rtl::OUString sRevision( utl::Bootstrap::getRevisionInfo() );
526 
527     if ( sRevision.getLength() > 0 )
528     {
529         aBuildString.appendAscii( RTL_CONSTASCII_STRINGPARAM( "  -  Rev. " ) );
530         aBuildString.append( sRevision );
531     }
532 
533 #ifdef BUILD_VER_STRING
534     rtl::OUString sBuildVer( RTL_CONSTASCII_USTRINGPARAM( STRINGIFY( BUILD_VER_STRING ) ) );
535     if ( sBuildVer.getLength() > 0 )
536     {
537         aBuildString.append( sal_Unicode( '\n' ) );
538         aBuildString.append( sBuildVer );
539     }
540 #endif
541 
542     return aBuildString.makeStringAndClear();
543 }
544 
545 // -----------------------------------------------------------------------
546 
547 sal_Bool AboutDialog::Close()
548 {
549     EndDialog( RET_OK );
550     return( sal_False );
551 }
552 
553 // -----------------------------------------------------------------------
554 
555 void AboutDialog::Paint( const Rectangle& rRect )
556 {
557     SetClipRegion( rRect );
558 
559     // workaround to ensure that the background is painted correct
560     // on MacOS for exmaple the background was grey and the image and other controls white
561     SetFillColor(GetSettings().GetStyleSettings().GetWindowColor());
562     SetLineColor();
563     DrawRect(rRect);
564 
565     DrawImage( maMainLogoPos, maMainLogo );
566     DrawImage( maAppLogoPos, maAppLogo );
567 
568     return;
569 }
570 
571 // -----------------------------------------------------------------------
572 
573 IMPL_LINK ( AboutDialog, OpenLinkHdl_Impl, svt::FixedHyperlink*, EMPTYARG )
574 {
575     ::rtl::OUString sURL( maCreditsLink.GetURL() );
576     if ( sURL.getLength() > 0 )
577     {
578         try
579         {
580             uno::Reference< com::sun::star::system::XSystemShellExecute > xSystemShell(
581                 com::sun::star::system::SystemShellExecute::create(
582                     ::comphelper::getProcessComponentContext() ) );
583             if ( xSystemShell.is() )
584                 xSystemShell->execute( sURL, rtl::OUString(), com::sun::star::system::SystemShellExecuteFlags::DEFAULTS );
585         }
586         catch( const uno::Exception& e )
587         {
588              OSL_TRACE( "Caught exception: %s\n thread terminated.\n",
589                 rtl::OUStringToOString(e.Message, RTL_TEXTENCODING_UTF8).getStr());
590         }
591     }
592 
593     return 0;
594 }
595 
596 IMPL_LINK ( AboutDialog, ShowReadme_Impl, PushButton*, EMPTYARG )
597 {
598     ReadmeDialog aDlg( this );
599     aDlg.Execute();
600 
601     return 0;
602 }
603