sd/source/console/PresenterHelpView.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <utility>
  21 #include <vcl/settings.hxx>
  22 #include "PresenterHelpView.hxx"
  23 #include "PresenterButton.hxx"
  24 #include "PresenterCanvasHelper.hxx"
  25 #include "PresenterGeometryHelper.hxx"
  26 #include <DrawController.hxx>
  27 #include <com/sun/star/awt/XWindowPeer.hpp>
  28 #include <com/sun/star/container/XNameAccess.hpp>
  29 #include <com/sun/star/drawing/framework/XConfigurationController.hpp>
  30 #include <com/sun/star/rendering/CompositeOperation.hpp>
  31 #include <com/sun/star/rendering/TextDirection.hpp>
  32 #include <com/sun/star/util/Color.hpp>
  33 #include <algorithm>
  34 #include <numeric>
  35 #include <string_view>
  36 #include <vector>
  37
  38 using namespace ::com::sun::star;
  39 using namespace ::com::sun::star::uno;
  40 using namespace ::com::sun::star::drawing::framework;
  41 using ::std::vector;
  42
  43 namespace sdext::presenter {
  44
  45 namespace {
  46     const sal_Int32 gnHorizontalGap (20);
  47     const sal_Int32 gnVerticalBorder (30);
  48     const sal_Int32 gnVerticalButtonPadding (12);
  49
  50     class LineDescriptor
  51     {
  52     public:
  53         LineDescriptor();
  54         void AddPart (
  55             std::u16string_view rsLine,
  56             const css::uno::Reference<css::rendering::XCanvasFont>& rxFont);
  57         bool IsEmpty() const;
  58
  59         OUString msLine;
  60         geometry::RealSize2D maSize;
  61         double mnVerticalOffset;
  62
  63         void CalculateSize (const css::uno::Reference<css::rendering::XCanvasFont>& rxFont);
  64     };
  65
  66     class LineDescriptorList
  67     {
  68     public:
  69         LineDescriptorList (
  70             OUString sText,
  71             const css::uno::Reference<css::rendering::XCanvasFont>& rxFont,
  72             const sal_Int32 nMaximalWidth);
  73
  74         void Update (
  75             const css::uno::Reference<css::rendering::XCanvasFont>& rxFont,
  76             const sal_Int32 nMaximalWidth);
  77
  78         double Paint(
  79             const Reference<rendering::XCanvas>& rxCanvas,
  80             const geometry::RealRectangle2D& rBBox,
  81             const bool bFlushLeft,
  82             const rendering::ViewState& rViewState,
  83             rendering::RenderState& rRenderState,
  84             const css::uno::Reference<css::rendering::XCanvasFont>& rxFont) const;
  85         double GetHeight() const;
  86
  87     private:
  88         const OUString msText;
  89         std::shared_ptr<vector<LineDescriptor> > mpLineDescriptors;
  90
  91         static void SplitText (std::u16string_view rsText, vector<OUString>& rTextParts);
  92         void FormatText (
  93             const vector<OUString>& rTextParts,
  94             const css::uno::Reference<css::rendering::XCanvasFont>& rxFont,
  95             const sal_Int32 nMaximalWidth);
  96     };
  97
  98     class Block
  99     {
 100     public:
 101         Block (
 102             const OUString& rsLeftText,
 103             const OUString& rsRightText,
 104             const css::uno::Reference<css::rendering::XCanvasFont>& rxFont,
 105             const sal_Int32 nMaximalWidth);
 106         Block(const Block&) = delete;
 107         Block& operator=(const Block&) = delete;
 108         void Update (
 109             const css::uno::Reference<css::rendering::XCanvasFont>& rxFont,
 110             const sal_Int32 nMaximalWidth);
 111
 112         LineDescriptorList maLeft;
 113         LineDescriptorList maRight;
 114     };
 115 } // end of anonymous namespace
 116
 117 class PresenterHelpView::TextContainer : public vector<std::shared_ptr<Block> >
 118 {
 119 };
 120
 121 PresenterHelpView::PresenterHelpView (
 122     const Reference<uno::XComponentContext>& rxContext,
 123     const Reference<XResourceId>& rxViewId,
 124     const rtl::Reference<::sd::DrawController>& rxController,
 125     ::rtl::Reference<PresenterController> xPresenterController)
 126     : PresenterHelpViewInterfaceBase(m_aMutex),
 127       mxComponentContext(rxContext),
 128       mxViewId(rxViewId),
 129       mpPresenterController(std::move(xPresenterController)),
 130       mnSeparatorY(0),
 131       mnMaximalWidth(0)
 132 {
 133     try
 134     {
 135         // Get the content window via the pane anchor.
 136         Reference<XConfigurationController> xCC (
 137             rxController->getConfigurationController(), UNO_SET_THROW);
 138         mxPane.set(xCC->getResource(rxViewId->getAnchor()), UNO_QUERY_THROW);
 139
 140         mxWindow = mxPane->getWindow();
 141         ProvideCanvas();
 142
 143         mxWindow->addWindowListener(this);
 144         mxWindow->addPaintListener(this);
 145         Reference<awt::XWindowPeer> xPeer (mxWindow, UNO_QUERY);
 146         if (xPeer.is())
 147             xPeer->setBackground(util::Color(0xff000000));
 148         mxWindow->setVisible(true);
 149
 150         if (mpPresenterController.is())
 151         {
 152             mpFont = mpPresenterController->GetViewFont(mxViewId->getResourceURL());
 153             if (mpFont)
 154             {
 155                 mpFont->PrepareFont(mxCanvas);
 156             }
 157         }
 158
 159         // Create the close button.
 160         mpCloseButton = PresenterButton::Create(
 161             mxComponentContext,
 162             mpPresenterController,
 163             mpPresenterController->GetTheme(),
 164             mxWindow,
 165             mxCanvas,
 166             u"HelpViewCloser"_ustr);
 167
 168         ReadHelpStrings();
 169         Resize();
 170     }
 171     catch (RuntimeException&)
 172     {
 173         mxViewId = nullptr;
 174         mxWindow = nullptr;
 175         throw;
 176     }
 177 }
 178
 179 PresenterHelpView::~PresenterHelpView()
 180 {
 181 }
 182
 183 void SAL_CALL PresenterHelpView::disposing()
 184 {
 185     mxViewId = nullptr;
 186
 187     if (mpCloseButton.is())
 188     {
 189         Reference<lang::XComponent> xComponent = mpCloseButton;
 190         mpCloseButton = nullptr;
 191         if (xComponent.is())
 192             xComponent->dispose();
 193     }
 194
 195     if (mxWindow.is())
 196     {
 197         mxWindow->removeWindowListener(this);
 198         mxWindow->removePaintListener(this);
 199     }
 200 }
 201
 202 //----- lang::XEventListener --------------------------------------------------
 203
 204 void SAL_CALL PresenterHelpView::disposing (const lang::EventObject& rEventObject)
 205 {
 206     if (rEventObject.Source == mxCanvas)
 207     {
 208         mxCanvas = nullptr;
 209     }
 210     else if (rEventObject.Source == mxWindow)
 211     {
 212         mxWindow = nullptr;
 213         dispose();
 214     }
 215 }
 216
 217 //----- XWindowListener -------------------------------------------------------
 218
 219 void SAL_CALL PresenterHelpView::windowResized (const awt::WindowEvent&)
 220 {
 221     ThrowIfDisposed();
 222     Resize();
 223 }
 224
 225 void SAL_CALL PresenterHelpView::windowMoved (const awt::WindowEvent&)
 226 {
 227     ThrowIfDisposed();
 228 }
 229
 230 void SAL_CALL PresenterHelpView::windowShown (const lang::EventObject&)
 231 {
 232     ThrowIfDisposed();
 233     Resize();
 234 }
 235
 236 void SAL_CALL PresenterHelpView::windowHidden (const lang::EventObject&)
 237 {
 238     ThrowIfDisposed();
 239 }
 240
 241 //----- XPaintListener --------------------------------------------------------
 242
 243 void SAL_CALL PresenterHelpView::windowPaint (const css::awt::PaintEvent& rEvent)
 244 {
 245     Paint(rEvent.UpdateRect);
 246 }
 247
 248 void PresenterHelpView::Paint (const awt::Rectangle& rUpdateBox)
 249 {
 250     ProvideCanvas();
 251     if ( ! mxCanvas.is())
 252         return;
 253
 254     // Clear background.
 255     const awt::Rectangle aWindowBox (mxWindow->getPosSize());
 256     mpPresenterController->GetCanvasHelper()->Paint(
 257         mpPresenterController->GetViewBackground(mxViewId->getResourceURL()),
 258         mxCanvas,
 259         rUpdateBox,
 260         awt::Rectangle(0,0,aWindowBox.Width,aWindowBox.Height),
 261         awt::Rectangle());
 262
 263     // Paint vertical divider.
 264
 265     rendering::ViewState aViewState(
 266         geometry::AffineMatrix2D(1,0,0, 0,1,0),
 267         PresenterGeometryHelper::CreatePolygon(rUpdateBox, mxCanvas->getDevice()));
 268
 269     rendering::RenderState aRenderState (
 270         geometry::AffineMatrix2D(1,0,0, 0,1,0),
 271         nullptr,
 272         Sequence<double>(4),
 273         rendering::CompositeOperation::SOURCE);
 274     PresenterCanvasHelper::SetDeviceColor(aRenderState, mpFont->mnColor);
 275
 276     mxCanvas->drawLine(
 277             geometry::RealPoint2D((aWindowBox.Width/2.0), gnVerticalBorder),
 278             geometry::RealPoint2D((aWindowBox.Width/2.0), mnSeparatorY - gnVerticalBorder),
 279         aViewState,
 280         aRenderState);
 281
 282     // Paint the horizontal separator.
 283     mxCanvas->drawLine(
 284         geometry::RealPoint2D(0, mnSeparatorY),
 285         geometry::RealPoint2D(aWindowBox.Width, mnSeparatorY),
 286         aViewState,
 287         aRenderState);
 288
 289     // Paint text.
 290     double nY (gnVerticalBorder);
 291     for (const auto& rxBlock : *mpTextContainer)
 292     {
 293         sal_Int32 LeftX1 = gnHorizontalGap;
 294         sal_Int32 LeftX2 = aWindowBox.Width/2 - gnHorizontalGap;
 295         sal_Int32 RightX1 = aWindowBox.Width/2 + gnHorizontalGap;
 296         sal_Int32 RightX2 = aWindowBox.Width - gnHorizontalGap;
 297         /* check whether RTL interface or not
 298            then replace the windowbox position */
 299         if(AllSettings::GetLayoutRTL())
 300         {
 301             LeftX1 = aWindowBox.Width/2 + gnHorizontalGap;
 302             LeftX2 = aWindowBox.Width - gnHorizontalGap;
 303             RightX1 = gnHorizontalGap;
 304             RightX2 = aWindowBox.Width/2 - gnHorizontalGap;
 305         }
 306         const double nLeftHeight (
 307             rxBlock->maLeft.Paint(mxCanvas,
 308                 geometry::RealRectangle2D(
 309                         LeftX1,
 310                         nY,
 311                         LeftX2,
 312                         aWindowBox.Height - gnVerticalBorder),
 313                 false,
 314                 aViewState,
 315                 aRenderState,
 316                 mpFont->mxFont));
 317         const double nRightHeight (
 318             rxBlock->maRight.Paint(mxCanvas,
 319                 geometry::RealRectangle2D(
 320                         RightX1,
 321                         nY,
 322                         RightX2,
 323                         aWindowBox.Height - gnVerticalBorder),
 324                 true,
 325                 aViewState,
 326                 aRenderState,
 327                 mpFont->mxFont));
 328
 329         nY += ::std::max(nLeftHeight,nRightHeight);
 330     }
 331
 332     Reference<rendering::XSpriteCanvas> xSpriteCanvas (mxCanvas, UNO_QUERY);
 333     if (xSpriteCanvas.is())
 334         xSpriteCanvas->updateScreen(false);
 335 }
 336
 337 void PresenterHelpView::ReadHelpStrings()
 338 {
 339     mpTextContainer.reset(new TextContainer);
 340     PresenterConfigurationAccess aConfiguration (
 341         mxComponentContext,
 342         u"/org.openoffice.Office.PresenterScreen/"_ustr,
 343         PresenterConfigurationAccess::READ_ONLY);
 344     Reference<container::XNameAccess> xStrings (
 345         aConfiguration.GetConfigurationNode(u"PresenterScreenSettings/HelpView/HelpStrings"_ustr),
 346         UNO_QUERY);
 347     PresenterConfigurationAccess::ForAll(
 348         xStrings,
 349         [this](OUString const&, uno::Reference<beans::XPropertySet> const& xProps)
 350         {
 351             return this->ProcessString(xProps);
 352         });
 353 }
 354
 355 void PresenterHelpView::ProcessString (
 356     const Reference<beans::XPropertySet>& rsProperties)
 357 {
 358     if ( ! rsProperties.is())
 359         return;
 360
 361     OUString sLeftText;
 362     PresenterConfigurationAccess::GetProperty(rsProperties, u"Left"_ustr) >>= sLeftText;
 363     OUString sRightText;
 364     PresenterConfigurationAccess::GetProperty(rsProperties, u"Right"_ustr) >>= sRightText;
 365     mpTextContainer->push_back(
 366         std::make_shared<Block>(
 367             sLeftText, sRightText, mpFont->mxFont, mnMaximalWidth));
 368 }
 369
 370 void PresenterHelpView::CheckFontSize()
 371 {
 372     if (!mpFont)
 373         return;
 374
 375     sal_Int32 nBestSize (6);
 376
 377     // Scaling down and then reformatting can cause the text to be too large
 378     // still.  So do this again and again until the text size is
 379     // small enough.  Restrict the number of loops.
 380     for (int nLoopCount=0; nLoopCount<5; ++nLoopCount)
 381     {
 382         double nY = std::accumulate(mpTextContainer->begin(), mpTextContainer->end(), double(0),
 383             [](const double& sum, const std::shared_ptr<Block>& rxBlock) {
 384                 return sum + std::max(
 385                     rxBlock->maLeft.GetHeight(),
 386                     rxBlock->maRight.GetHeight());
 387             });
 388
 389         const double nHeightDifference (nY - (mnSeparatorY-gnVerticalBorder));
 390         if (nHeightDifference <= 0 && nHeightDifference > -50)
 391         {
 392             // We have found a good font size that is large and leaves not
 393             // too much space below the help text.
 394             return;
 395         }
 396
 397         // Use a simple linear transformation to calculate initial guess of
 398         // a size that lets all help text to be shown inside the window.
 399         const double nScale (double(mnSeparatorY-gnVerticalBorder) / nY);
 400         if (nScale > 1.0 && nScale < 1.05)
 401             break;
 402
 403         sal_Int32 nFontSizeGuess (sal_Int32(mpFont->mnSize * nScale));
 404         if (nHeightDifference<=0 && mpFont->mnSize>nBestSize)
 405             nBestSize = mpFont->mnSize;
 406         mpFont->mnSize = nFontSizeGuess;
 407         mpFont->mxFont = nullptr;
 408         mpFont->PrepareFont(mxCanvas);
 409
 410         // Reformat blocks.
 411         for (auto& rxBlock : *mpTextContainer)
 412             rxBlock->Update(mpFont->mxFont, mnMaximalWidth);
 413     }
 414
 415     if (nBestSize != mpFont->mnSize)
 416     {
 417         mpFont->mnSize = nBestSize;
 418         mpFont->mxFont = nullptr;
 419         mpFont->PrepareFont(mxCanvas);
 420
 421         // Reformat blocks.
 422         for (auto& rxBlock : *mpTextContainer)
 423         {
 424             rxBlock->Update(mpFont->mxFont, mnMaximalWidth);
 425         }
 426     }
 427 }
 428
 429 //----- XResourceId -----------------------------------------------------------
 430
 431 Reference<XResourceId> SAL_CALL PresenterHelpView::getResourceId()
 432 {
 433     ThrowIfDisposed();
 434     return mxViewId;
 435 }
 436
 437 sal_Bool SAL_CALL PresenterHelpView::isAnchorOnly()
 438 {
 439     return false;
 440 }
 441
 442
 443 void PresenterHelpView::ProvideCanvas()
 444 {
 445     if ( ! mxCanvas.is() && mxPane.is())
 446     {
 447         mxCanvas = mxPane->getCanvas();
 448         if ( ! mxCanvas.is())
 449             return;
 450         Reference<lang::XComponent> xComponent (mxCanvas, UNO_QUERY);
 451         if (xComponent.is())
 452             xComponent->addEventListener(static_cast<awt::XPaintListener*>(this));
 453
 454         if (mpCloseButton.is())
 455             mpCloseButton->SetCanvas(mxCanvas, mxWindow);
 456     }
 457 }
 458
 459 void PresenterHelpView::Resize()
 460 {
 461     if (!(mpCloseButton && mxWindow.is()))
 462         return;
 463
 464     const awt::Rectangle aWindowBox (mxWindow->getPosSize());
 465     mnMaximalWidth = (mxWindow->getPosSize().Width - 4*gnHorizontalGap) / 2;
 466
 467     // Place vertical separator.
 468     mnSeparatorY = aWindowBox.Height
 469         - mpCloseButton->GetSize().Height - gnVerticalButtonPadding;
 470
 471     mpCloseButton->SetCenter(geometry::RealPoint2D(
 472         aWindowBox.Width/2.0,
 473         aWindowBox.Height - mpCloseButton->GetSize().Height/2.0));
 474
 475     CheckFontSize();
 476 }
 477
 478 void PresenterHelpView::ThrowIfDisposed()
 479 {
 480     if (rBHelper.bDisposed || rBHelper.bInDispose)
 481     {
 482         throw lang::DisposedException (
 483             u"PresenterHelpView has been already disposed"_ustr,
 484             static_cast<uno::XWeak*>(this));
 485     }
 486 }
 487
 488 //===== LineDescriptor =========================================================
 489
 490 namespace {
 491
 492 LineDescriptor::LineDescriptor()
 493     : maSize(0,0),
 494       mnVerticalOffset(0)
 495 {
 496 }
 497
 498 void LineDescriptor::AddPart (
 499     std::u16string_view rsLine,
 500     const css::uno::Reference<css::rendering::XCanvasFont>& rxFont)
 501 {
 502     msLine += rsLine;
 503
 504     CalculateSize(rxFont);
 505 }
 506
 507 bool LineDescriptor::IsEmpty() const
 508 {
 509     return msLine.isEmpty();
 510 }
 511
 512 void LineDescriptor::CalculateSize (
 513     const css::uno::Reference<css::rendering::XCanvasFont>& rxFont)
 514 {
 515     OSL_ASSERT(rxFont.is());
 516
 517     rendering::StringContext aContext (msLine, 0, msLine.getLength());
 518     Reference<rendering::XTextLayout> xLayout (
 519         rxFont->createTextLayout(aContext, rendering::TextDirection::WEAK_LEFT_TO_RIGHT, 0));
 520     const geometry::RealRectangle2D aTextBBox (xLayout->queryTextBounds());
 521     maSize = css::geometry::RealSize2D(aTextBBox.X2 - aTextBBox.X1, aTextBBox.Y2 - aTextBBox.Y1);
 522     mnVerticalOffset = aTextBBox.Y2;
 523 }
 524
 525 } // end of anonymous namespace
 526
 527 //===== LineDescriptorList ====================================================
 528
 529 namespace {
 530
 531 LineDescriptorList::LineDescriptorList (
 532     OUString sText,
 533     const css::uno::Reference<css::rendering::XCanvasFont>& rxFont,
 534     const sal_Int32 nMaximalWidth)
 535     : msText(std::move(sText))
 536 {
 537     Update(rxFont, nMaximalWidth);
 538 }
 539
 540 double LineDescriptorList::Paint(
 541     const Reference<rendering::XCanvas>& rxCanvas,
 542     const geometry::RealRectangle2D& rBBox,
 543     const bool bFlushLeft,
 544     const rendering::ViewState& rViewState,
 545     rendering::RenderState& rRenderState,
 546     const css::uno::Reference<css::rendering::XCanvasFont>& rxFont) const
 547 {
 548     if ( ! rxCanvas.is())
 549         return 0;
 550
 551     double nY (rBBox.Y1);
 552     for (const auto& rLine : *mpLineDescriptors)
 553     {
 554         double nX;
 555         /// check whether RTL interface or not
 556         if(!AllSettings::GetLayoutRTL())
 557         {
 558             nX = rBBox.X1;
 559             if ( ! bFlushLeft)
 560                 nX = rBBox.X2 - rLine.maSize.Width;
 561         }
 562         else
 563         {
 564             nX=rBBox.X2 - rLine.maSize.Width;
 565             if ( ! bFlushLeft)
 566                 nX = rBBox.X1;
 567         }
 568         rRenderState.AffineTransform.m02 = nX;
 569         rRenderState.AffineTransform.m12 = nY + rLine.maSize.Height - rLine.mnVerticalOffset;
 570
 571         const rendering::StringContext aContext (rLine.msLine, 0, rLine.msLine.getLength());
 572         Reference<rendering::XTextLayout> xLayout (
 573         rxFont->createTextLayout(aContext, rendering::TextDirection::WEAK_LEFT_TO_RIGHT, 0));
 574         rxCanvas->drawTextLayout (
 575             xLayout,
 576             rViewState,
 577             rRenderState);
 578
 579         nY += rLine.maSize.Height * 1.2;
 580     }
 581
 582     return nY - rBBox.Y1;
 583 }
 584
 585 double LineDescriptorList::GetHeight() const
 586 {
 587     return std::accumulate(mpLineDescriptors->begin(), mpLineDescriptors->end(), double(0),
 588         [](const double& nHeight, const LineDescriptor& rLine) {
 589             return nHeight + rLine.maSize.Height * 1.2;
 590         });
 591 }
 592
 593 void LineDescriptorList::Update (
 594     const css::uno::Reference<css::rendering::XCanvasFont>& rxFont,
 595     const sal_Int32 nMaximalWidth)
 596 {
 597     vector<OUString> aTextParts;
 598     SplitText(msText, aTextParts);
 599     FormatText(aTextParts, rxFont, nMaximalWidth);
 600 }
 601
 602 void LineDescriptorList::SplitText (
 603     std::u16string_view rsText,
 604     vector<OUString>& rTextParts)
 605 {
 606     const char cQuote ('\'');
 607     const char cSeparator (',');
 608
 609     size_t nIndex (0);
 610     size_t nStart (0);
 611     size_t nLength (rsText.size());
 612     bool bIsQuoted (false);
 613     while (nIndex < nLength)
 614     {
 615         const size_t nQuoteIndex (rsText.find(cQuote, nIndex));
 616         const size_t nSeparatorIndex (rsText.find(cSeparator, nIndex));
 617         if (nQuoteIndex != std::u16string_view::npos &&
 618             (nSeparatorIndex == std::u16string_view::npos || nQuoteIndex<nSeparatorIndex))
 619         {
 620             bIsQuoted = !bIsQuoted;
 621             nIndex = nQuoteIndex+1;
 622             continue;
 623         }
 624
 625         const sal_Int32 nNextIndex = nSeparatorIndex;
 626         if (nNextIndex < 0)
 627         {
 628             break;
 629         }
 630         else if ( ! bIsQuoted)
 631         {
 632             rTextParts.push_back(OUString(rsText.substr(nStart, nNextIndex-nStart)));
 633             nStart = nNextIndex + 1;
 634         }
 635         nIndex = nNextIndex+1;
 636     }
 637     if (nStart < nLength)
 638         rTextParts.push_back(OUString(rsText.substr(nStart, nLength-nStart)));
 639 }
 640
 641 void LineDescriptorList::FormatText (
 642     const vector<OUString>& rTextParts,
 643     const css::uno::Reference<css::rendering::XCanvasFont>& rxFont,
 644     const sal_Int32 nMaximalWidth)
 645 {
 646     LineDescriptor aLineDescriptor;
 647
 648     mpLineDescriptors = std::make_shared<vector<LineDescriptor>>();
 649
 650     vector<OUString>::const_iterator iPart (rTextParts.begin());
 651     vector<OUString>::const_iterator iEnd (rTextParts.end());
 652     while (iPart!=iEnd)
 653     {
 654         if (aLineDescriptor.IsEmpty())
 655         {
 656             // Avoid empty lines.
 657             if (PresenterCanvasHelper::GetTextSize(
 658                 rxFont, *iPart).Width > nMaximalWidth)
 659             {
 660                 const char cSpace (' ');
 661
 662                 sal_Int32 nIndex (0);
 663                 sal_Int32 nStart (0);
 664                 sal_Int32 nLength (iPart->getLength());
 665                 while (nIndex < nLength)
 666                 {
 667                     sal_Int32  nSpaceIndex (iPart->indexOf(cSpace, nIndex));
 668                     while (nSpaceIndex >= 0 && PresenterCanvasHelper::GetTextSize(
 669                         rxFont, iPart->copy(nStart, nSpaceIndex-nStart)).Width <= nMaximalWidth)
 670                     {
 671                         nIndex = nSpaceIndex;
 672                         nSpaceIndex = iPart->indexOf(cSpace, nIndex+1);
 673                     }
 674
 675                     if (nSpaceIndex < 0 && PresenterCanvasHelper::GetTextSize(
 676                         rxFont, iPart->copy(nStart, nLength-nStart)).Width <= nMaximalWidth)
 677                     {
 678                         nIndex = nLength;
 679                     }
 680
 681                     if (nIndex == nStart)
 682                     {
 683                         nIndex = nLength;
 684                     }
 685
 686                     aLineDescriptor.AddPart(iPart->subView(nStart, nIndex-nStart), rxFont);
 687                     if (nIndex != nLength)
 688                     {
 689                         mpLineDescriptors->push_back(aLineDescriptor);
 690                         aLineDescriptor = LineDescriptor();
 691                     }
 692                     nStart = nIndex;
 693                 }
 694             }
 695             else
 696             {
 697                 aLineDescriptor.AddPart(*iPart, rxFont);
 698             }
 699         }
 700         else if (PresenterCanvasHelper::GetTextSize(
 701             rxFont, aLineDescriptor.msLine+", "+*iPart).Width > nMaximalWidth)
 702         {
 703             aLineDescriptor.AddPart(u",", rxFont);
 704             mpLineDescriptors->push_back(aLineDescriptor);
 705             aLineDescriptor = LineDescriptor();
 706             continue;
 707         }
 708         else
 709         {
 710             aLineDescriptor.AddPart(Concat2View(", "+*iPart), rxFont);
 711         }
 712         ++iPart;
 713     }
 714     if ( ! aLineDescriptor.IsEmpty())
 715     {
 716         mpLineDescriptors->push_back(aLineDescriptor);
 717     }
 718 }
 719
 720 } // end of anonymous namespace
 721
 722 //===== Block =================================================================
 723
 724 namespace {
 725
 726 Block::Block (
 727     const OUString& rsLeftText,
 728     const OUString& rsRightText,
 729     const css::uno::Reference<css::rendering::XCanvasFont>& rxFont,
 730     const sal_Int32 nMaximalWidth)
 731     : maLeft(rsLeftText, rxFont, nMaximalWidth),
 732       maRight(rsRightText, rxFont, nMaximalWidth)
 733 {
 734 }
 735
 736 void Block::Update (
 737     const css::uno::Reference<css::rendering::XCanvasFont>& rxFont,
 738     const sal_Int32 nMaximalWidth)
 739 {
 740     maLeft.Update(rxFont, nMaximalWidth);
 741     maRight.Update(rxFont, nMaximalWidth);
 742 }
 743
 744 } // end of anonymous namespace
 745
 746 } // end of namespace ::sdext::presenter
 747
 748 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */