kate Library API Documentation

katerenderer.cpp

00001 /* This file is part of the KDE libraries
00002    Copyright (C) 2003 Hamish Rodda <rodda@kde.org>
00003    Copyright (C) 2001 Christoph Cullmann <cullmann@kde.org>
00004    Copyright (C) 2001 Joseph Wenninger <jowenn@kde.org>
00005    Copyright (C) 1999 Jochen Wilhelmy <digisnap@cs.tu-berlin.de>
00006 
00007    This library is free software; you can redistribute it and/or
00008    modify it under the terms of the GNU Library General Public
00009    License version 2 as published by the Free Software Foundation.
00010 
00011    This library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Library General Public License for more details.
00015 
00016    You should have received a copy of the GNU Library General Public License
00017    along with this library; see the file COPYING.LIB.  If not, write to
00018    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00019    Boston, MA 02111-1307, USA.
00020 */
00021 
00022 #include "katerenderer.h"
00023 
00024 #include "katelinerange.h"
00025 #include "katedocument.h"
00026 #include "katearbitraryhighlight.h"
00027 #include "kateconfig.h"
00028 #include "katehighlight.h"
00029 #include "katefactory.h"
00030 #include "kateview.h"
00031 
00032 #include <kdebug.h>
00033 
00034 #include <qpainter.h>
00035 #include <qpopupmenu.h>
00036 
00037 static const QChar tabChar('\t');
00038 static const QChar spaceChar(' ');
00039 
00040 KateRenderer::KateRenderer(KateDocument* doc, KateView *view)
00041   : m_doc(doc), m_view (view), m_caretStyle(KateRenderer::Insert)
00042     , m_drawCaret(true)
00043     , m_showSelections(true)
00044     , m_showTabs(true)
00045     , m_printerFriendly(false)
00046 {
00047   KateFactory::self()->registerRenderer ( this );
00048   m_config = new KateRendererConfig (this);
00049 
00050   m_tabWidth = m_doc->config()->tabWidth();
00051 
00052   updateAttributes ();
00053 }
00054 
00055 KateRenderer::~KateRenderer()
00056 {
00057   delete m_config;
00058   KateFactory::self()->deregisterRenderer ( this );
00059 }
00060 
00061 void KateRenderer::updateAttributes ()
00062 {
00063   m_schema = config()->schema ();
00064   m_attributes = m_doc->highlight()->attributes (m_schema);
00065 }
00066 
00067 KateAttribute* KateRenderer::attribute(uint pos)
00068 {
00069   if (pos < m_attributes->size())
00070     return &m_attributes->at(pos);
00071 
00072   return &m_attributes->at(0);
00073 }
00074 
00075 void KateRenderer::setDrawCaret(bool drawCaret)
00076 {
00077   m_drawCaret = drawCaret;
00078 }
00079 
00080 void KateRenderer::setCaretStyle(KateRenderer::caretStyles style)
00081 {
00082   m_caretStyle = style;
00083 }
00084 
00085 void KateRenderer::setShowTabs(bool showTabs)
00086 {
00087   m_showTabs = showTabs;
00088 }
00089 
00090 void KateRenderer::setTabWidth(int tabWidth)
00091 {
00092   m_tabWidth = tabWidth;
00093 }
00094 
00095 void KateRenderer::setShowSelections(bool showSelections)
00096 {
00097   m_showSelections = showSelections;
00098 }
00099 
00100 void KateRenderer::increaseFontSizes()
00101 {
00102   QFont f ( *config()->font () );
00103   f.setPointSize (f.pointSize ()+1);
00104 
00105   config()->setFont (f);
00106 }
00107 
00108 void KateRenderer::decreaseFontSizes()
00109 {
00110   QFont f ( *config()->font () );
00111 
00112   if ((f.pointSize ()-1) > 0)
00113     f.setPointSize (f.pointSize ()-1);
00114 
00115   config()->setFont (f);
00116 }
00117 
00118 bool KateRenderer::isPrinterFriendly() const
00119 {
00120   return m_printerFriendly;
00121 }
00122 
00123 void KateRenderer::setPrinterFriendly(bool printerFriendly)
00124 {
00125   m_printerFriendly = printerFriendly;
00126   setShowTabs(false);
00127   setShowSelections(false);
00128   setDrawCaret(false);
00129 }
00130 
00131 bool KateRenderer::paintTextLineBackground(QPainter& paint, int line, bool isCurrentLine, int xStart, int xEnd)
00132 {
00133   if (isPrinterFriendly())
00134     return false;
00135 
00136   // font data
00137   KateFontStruct *fs = config()->fontStruct();
00138 
00139   // Normal background color
00140   QColor backgroundColor( config()->backgroundColor() );
00141 
00142   bool selectionPainted = false;
00143   if (showSelections() && m_doc->lineSelected(line))
00144   {
00145     backgroundColor = config()->selectionColor();
00146     selectionPainted = true;
00147   }
00148   else
00149   {
00150     // paint the current line background if we're on the current line
00151     if (isCurrentLine)
00152       backgroundColor = config()->highlightedLineColor();
00153 
00154     // Check for mark background
00155     int markRed = 0, markGreen = 0, markBlue = 0, markCount = 0;
00156 
00157     // Retrieve marks for this line
00158     uint mrk = m_doc->mark( line );
00159     if (mrk)
00160     {
00161       for (uint bit = 0; bit < 32; bit++)
00162       {
00163         KTextEditor::MarkInterface::MarkTypes markType = (KTextEditor::MarkInterface::MarkTypes)(1<<bit);
00164         if (mrk & markType)
00165         {
00166           QColor markColor = config()->lineMarkerColor(markType);
00167 
00168           if (markColor.isValid()) {
00169             markCount++;
00170             markRed += markColor.red();
00171             markGreen += markColor.green();
00172             markBlue += markColor.blue();
00173           }
00174         }
00175       } // for
00176     } // Marks
00177 
00178     if (markCount) {
00179       markRed /= markCount;
00180       markGreen /= markCount;
00181       markBlue /= markCount;
00182       backgroundColor.setRgb(
00183         int((backgroundColor.red() * 0.9) + (markRed * 0.1)),
00184         int((backgroundColor.green() * 0.9) + (markGreen * 0.1)),
00185         int((backgroundColor.blue() * 0.9) + (markBlue * 0.1))
00186       );
00187     }
00188   } // background preprocessing
00189 
00190   // Draw line background
00191   paint.fillRect(0, 0, xEnd - xStart, fs->fontHeight, backgroundColor);
00192 
00193   return selectionPainted;
00194 }
00195 
00196 void KateRenderer::paintWhitespaceMarker(QPainter &paint, uint x, uint y)
00197 {
00198   QPen penBackup( paint.pen() );
00199   paint.setPen( config()->tabMarkerColor() );
00200   paint.drawPoint(x,     y);
00201   paint.drawPoint(x + 1, y);
00202   paint.drawPoint(x,     y - 1);
00203   paint.setPen( penBackup );
00204 }
00205 
00206 void KateRenderer::paintTextLine(QPainter& paint, const KateLineRange* range, int xStart, int xEnd, const KateTextCursor* cursor, const KateTextRange* bracketmark)
00207 {
00208   int line = range->line;
00209 
00210   // textline
00211   KateTextLine::Ptr textLine = m_doc->kateTextLine(line);
00212   if (!textLine)
00213     return;
00214 
00215   bool showCursor = drawCaret() && cursor && range->includesCursor(*cursor);
00216 
00217   KateSuperRangeList& superRanges = m_doc->arbitraryHL()->rangesIncluding(range->line, 0);
00218 
00219   // A bit too verbose for my tastes
00220   // Re-write a bracketmark class? put into its own function? add more helper constructors to the range stuff?
00221   // Also, need a light-weight arbitraryhighlightrange class for static stuff
00222   KateArbitraryHighlightRange* bracketStartRange (0L);
00223   KateArbitraryHighlightRange* bracketEndRange (0L);
00224   if (bracketmark && bracketmark->isValid()) {
00225     if (range->includesCursor(bracketmark->start())) {
00226       KateTextCursor startend = bracketmark->start();
00227       startend.setCol(startend.col()+1);
00228       bracketStartRange = new KateArbitraryHighlightRange(m_doc, bracketmark->start(), startend);
00229       bracketStartRange->setBGColor(config()->highlightedBracketColor());
00230       bracketStartRange->setBold(true);
00231       superRanges.append(bracketStartRange);
00232     }
00233 
00234     if (range->includesCursor(bracketmark->end())) {
00235       KateTextCursor endend = bracketmark->end();
00236       endend.setCol(endend.col()+1);
00237       bracketEndRange = new KateArbitraryHighlightRange(m_doc, bracketmark->end(), endend);
00238       bracketEndRange->setBGColor(config()->highlightedBracketColor());
00239       bracketEndRange->setBold(true);
00240       superRanges.append(bracketEndRange);
00241     }
00242   }
00243 
00244   // length, chars + raw attribs
00245   uint len = textLine->length();
00246   uint oldLen = len;
00247 
00248   // should the cursor be painted (if it is in the current xstart - xend range)
00249   bool cursorVisible = false;
00250   int cursorMaxWidth = 0;
00251 
00252   // font data
00253   KateFontStruct * fs = config()->fontStruct();
00254 
00255   // Paint selection background as the whole line is selected
00256   // selection startcol/endcol calc
00257   bool hasSel = false;
00258   uint startSel = 0;
00259   uint endSel = 0;
00260 
00261   // was the selection background already completely painted ?
00262   bool selectionPainted = false;
00263   bool isCurrentLine = (cursor && range->includesCursor(*cursor));
00264   selectionPainted = paintTextLineBackground(paint, line, isCurrentLine, xStart, xEnd);
00265   if (selectionPainted)
00266   {
00267     hasSel = true;
00268     startSel = 0;
00269     endSel = len + 1;
00270   }
00271 
00272   int startcol = range->startCol;
00273   if (startcol > (int)len)
00274     startcol = len;
00275 
00276   if (startcol < 0)
00277     startcol = 0;
00278 
00279   int endcol = range->wrap ? range->endCol : -1;
00280   if (endcol < 0)
00281     len = len - startcol;
00282   else
00283     len = endcol - startcol;
00284 
00285   // text attribs font/style data
00286   KateAttribute* attr = m_doc->highlight()->attributes(m_schema)->data();
00287 
00288   const QColor *cursorColor = &attr[0].textColor();
00289 
00290   // Start arbitrary highlighting
00291   KateTextCursor currentPos(line, startcol);
00292   superRanges.firstBoundary(&currentPos);
00293 
00294   if (showSelections() && !selectionPainted)
00295     hasSel = getSelectionBounds(line, oldLen, startSel, endSel);
00296 
00297   // Draws the dashed underline at the start of a folded block of text.
00298   if (range->startsInvisibleBlock) {
00299     paint.setPen(QPen(config()->wordWrapMarkerColor(), 1, Qt::DashLine));
00300     paint.drawLine(0, fs->fontHeight - 1, xEnd - xStart, fs->fontHeight - 1);
00301   }
00302 
00303   // draw word-wrap-honor-indent filling
00304   if (range->xOffset() && range->xOffset() > xStart)
00305   {
00306     paint.fillRect(0, 0, range->xOffset() - xStart, fs->fontHeight,
00307       QBrush(config()->wordWrapMarkerColor(), QBrush::DiagCrossPattern));
00308   }
00309 
00310   // painting loop
00311   uint xPos = range->xOffset();
00312   int cursorXPos = 0;
00313 
00314   // Optimisation to quickly draw an empty line of text
00315   if (len < 1)
00316   {
00317     if (showCursor && (cursor->col() >= int(startcol)))
00318     {
00319       cursorVisible = true;
00320       cursorXPos = xPos + cursor->col() * fs->myFontMetrics.width(spaceChar);
00321     }
00322   }
00323   else
00324   {
00325     bool isIMSel  = false;
00326     bool isIMEdit = false;
00327 
00328     bool isSel = false;
00329 
00330     KateAttribute customHL;
00331 
00332     const QColor *curColor = 0;
00333     const QColor *oldColor = 0;
00334 
00335     KateAttribute* oldAt = &attr[0];
00336 
00337     uint oldXPos = xPos;
00338     uint xPosAfter = xPos;
00339 
00340     KateAttribute currentHL;
00341 
00342     uint blockStartCol = startcol;
00343     uint curCol = startcol;
00344     uint nextCol = curCol + 1;
00345 
00346     // text + attrib data from line
00347     const uchar *textAttributes = textLine->attributes ();
00348     bool noAttribs = !textAttributes;
00349 
00350     // adjust to startcol ;)
00351     textAttributes = textAttributes + startcol;
00352 
00353     uint atLen = m_doc->highlight()->attributes(m_schema)->size();
00354 
00355     // Determine if we have trailing whitespace and store the column
00356     // if lastChar == -1, set to 0, if lastChar exists, increase by one
00357     uint trailingWhitespaceColumn = textLine->lastChar() + 1;
00358 
00359     while (curCol - startcol < len)
00360     {
00361       QChar curChar = textLine->string()[curCol];
00362       // Decide if this character is a tab - we treat the spacing differently
00363       // TODO: move tab width calculation elsewhere?
00364       bool isTab = curChar == tabChar;
00365 
00366       // Determine current syntax highlighting attribute
00367       // A bit legacy but doesn't need to change
00368       KateAttribute* curAt = (noAttribs || ((*textAttributes) >= atLen)) ? &attr[0] : &attr[*textAttributes];
00369 
00370       // X position calculation. Incorrect for fonts with non-zero leftBearing() and rightBearing() results.
00371       // TODO: make internal charWidth() function, use QFontMetrics::charWidth().
00372       xPosAfter += curAt->width(*fs, curChar, m_tabWidth);
00373 
00374       // Tab special treatment, move to charWidth().
00375       if (isTab)
00376         xPosAfter -= (xPosAfter % curAt->width(*fs, curChar, m_tabWidth));
00377 
00378       // Only draw after the starting X value
00379       // Haha, this was always wrong, due to the use of individual char width calculations...?? :(
00380       if ((int)xPosAfter >= xStart)
00381       {
00382         // Determine if we're in a selection and should be drawing it
00383         isSel = (showSelections() && hasSel && (curCol >= startSel) && (curCol < endSel));
00384 
00385         // input method edit area
00386         isIMEdit = m_doc->isIMEdit( line, curCol );
00387 
00388         // input method selection
00389         isIMSel = m_doc->isIMSelection( line, curCol );
00390 
00391         // Determine current color, taking into account selection
00392         curColor = isSel ? &(curAt->selectedTextColor()) : &(curAt->textColor());
00393 
00394         // Incorporate in arbitrary highlighting
00395         if (curAt != oldAt || curColor != oldColor || (superRanges.count() && superRanges.currentBoundary() && *(superRanges.currentBoundary()) == currentPos)) {
00396           if (superRanges.count() && superRanges.currentBoundary() && *(superRanges.currentBoundary()) == currentPos)
00397             customHL = KateArbitraryHighlightRange::merge(superRanges.rangesIncluding(currentPos));
00398 
00399           KateAttribute hl = customHL;
00400 
00401           hl += *curAt;
00402 
00403           // use default highlighting color if we haven't defined one above.
00404           if (!hl.itemSet(KateAttribute::TextColor))
00405             hl.setTextColor(*curColor);
00406 
00407           if (!isSel)
00408             paint.setPen(hl.textColor());
00409           else
00410             paint.setPen(hl.selectedTextColor());
00411 
00412           paint.setFont(hl.font(*currentFont()));
00413 
00414           if (superRanges.currentBoundary() && *(superRanges.currentBoundary()) == currentPos)
00415             superRanges.nextBoundary();
00416 
00417           currentHL = hl;
00418         }
00419 
00420         // Determine whether we can delay painting to draw a block of similarly formatted
00421         // characters or not
00422         // Reasons for NOT delaying the drawing until the next character
00423         // You have to detect the change one character in advance.
00424         // TODO: KateAttribute::canBatchRender()
00425         bool renderNow = false;
00426         if ((isTab)
00427           // formatting has changed OR
00428           || (superRanges.count() && superRanges.currentBoundary() && *(superRanges.currentBoundary()) == KateTextCursor(line, nextCol))
00429 
00430           // it is the end of the line OR
00431           || (curCol >= len - 1)
00432 
00433           // the rest of the line is trailing whitespace OR
00434           || (curCol + 1 >= trailingWhitespaceColumn)
00435 
00436           // the x position is past the end OR
00437           || ((int)xPos > xEnd)
00438 
00439           // it is a different attribute OR
00440           || (!noAttribs && curAt != &attr[*(textAttributes+1)])
00441 
00442           // the selection boundary was crossed OR
00443           || (isSel != (hasSel && (nextCol >= startSel) && (nextCol < endSel)))
00444 
00445           // the next char is a tab (removed the "and this isn't" because that's dealt with above)
00446           // i.e. we have to draw the current text so the tab can be rendered as above.
00447           || (textLine->string()[nextCol] == tabChar)
00448 
00449           // input method edit area
00450           || ( isIMEdit != m_doc->isIMEdit( line, nextCol ) )
00451 
00452           // input method selection
00453           || ( isIMSel != m_doc->isIMSelection( line, nextCol ) )
00454         )
00455         {
00456           renderNow = true;
00457         }
00458 
00459         if (renderNow)
00460         {
00461           if (!isPrinterFriendly())
00462           {
00463             bool paintBackground = true;
00464             uint width = xPosAfter - oldXPos;
00465             QColor fillColor;
00466 
00467             if (isIMSel && !isTab)
00468             {
00469               // input method selection
00470               fillColor = m_view->colorGroup().color(QColorGroup::Foreground);
00471             }
00472             else if (isIMEdit && !isTab)
00473             {
00474               // XIM support
00475               // input method edit area
00476               const QColorGroup& cg = m_view->colorGroup();
00477               int h1, s1, v1, h2, s2, v2;
00478               cg.color( QColorGroup::Base ).hsv( &h1, &s1, &v1 );
00479               cg.color( QColorGroup::Background ).hsv( &h2, &s2, &v2 );
00480               fillColor.setHsv( h1, s1, ( v1 + v2 ) / 2 );
00481             }
00482             else if (!selectionPainted && (isSel || currentHL.itemSet(KateAttribute::BGColor)))
00483             {
00484               if (isSel)
00485               {
00486                 fillColor = config()->selectionColor();
00487 
00488                 // If this is the last block of text, fill up to the end of the line if the
00489                 // selection stretches that far
00490                 if ((curCol >= len - 1) && m_doc->lineEndSelected (line, endcol))
00491                   width = xEnd - oldXPos;
00492               }
00493               else
00494               {
00495                 fillColor = currentHL.bgColor();
00496               }
00497             }
00498             else
00499             {
00500               paintBackground = false;
00501             }
00502 
00503             if (paintBackground)
00504               paint.fillRect(oldXPos - xStart, 0, width, fs->fontHeight, fillColor);
00505 
00506             if (isIMSel && paintBackground && !isTab)
00507             {
00508               paint.save();
00509               paint.setPen( m_view->colorGroup().color( QColorGroup::BrightText ) );
00510             }
00511           }
00512 
00513           // or we will see no text ;)
00514           int y = fs->fontAscent;
00515 
00516           // make sure we redraw the right character groups on attrib/selection changes
00517           // Special case... de-special case some of it
00518           if (isTab || (curCol >= trailingWhitespaceColumn))
00519           {
00520             // Draw spaces too, because it might be eg. underlined
00521             static QString spaces;
00522             if (int(spaces.length()) != m_tabWidth)
00523               spaces.fill(' ', m_tabWidth);
00524 
00525             paint.drawText(oldXPos-xStart, y, isTab ? spaces : QString(" "));
00526 
00527             if (showTabs())
00528               paintWhitespaceMarker(paint, xPos - xStart, y);
00529 
00530             // variable advancement
00531             blockStartCol = nextCol;
00532             oldXPos = xPosAfter;
00533           }
00534           else
00535           {
00536             // Here's where the money is...
00537             paint.drawText(oldXPos-xStart, y, textLine->string(), blockStartCol, nextCol-blockStartCol);
00538 
00539             // Draw preedit's underline
00540             if (isIMEdit) {
00541               QRect r( oldXPos - xStart, 0, xPosAfter - oldXPos, fs->fontHeight );
00542               paint.drawLine( r.bottomLeft(), r.bottomRight() );
00543             }
00544 
00545             // Put pen color back
00546             if (isIMSel) paint.restore();
00547 
00548             // We're done drawing?
00549             if ((int)xPos > xEnd)
00550               break;
00551 
00552             // variable advancement
00553             blockStartCol = nextCol;
00554             oldXPos = xPosAfter;
00555             //oldS = s+1;
00556           }
00557         } // renderNow
00558 
00559         // determine cursor X position
00560         if (showCursor && (cursor->col() == int(curCol)))
00561         {
00562           cursorVisible = true;
00563           cursorXPos = xPos;
00564           cursorMaxWidth = xPosAfter - xPos;
00565           cursorColor = &curAt->textColor();
00566         }
00567       } // xPosAfter >= xStart
00568       else
00569       {
00570         // variable advancement
00571         blockStartCol = nextCol;
00572         oldXPos = xPosAfter;
00573       }
00574 
00575       // increase xPos
00576       xPos = xPosAfter;
00577 
00578       // increase attribs pos
00579       textAttributes++;
00580 
00581       // to only switch font/color if needed
00582       oldAt = curAt;
00583       oldColor = curColor;
00584 
00585       // col move
00586       curCol++;
00587       nextCol++;
00588       currentPos.setCol(currentPos.col() + 1);
00589     }
00590 
00591     // Determine cursor position (if it is not within the range being drawn)
00592     if (showCursor && (cursor->col() >= int(curCol)))
00593     {
00594       cursorVisible = true;
00595       cursorXPos = xPos + (cursor->col() - int(curCol)) * fs->myFontMetrics.width(spaceChar);
00596       cursorMaxWidth = xPosAfter - xPos;
00597       cursorColor = &oldAt->textColor();
00598     }
00599   }
00600 
00601   // Paint cursor
00602   if (cursorVisible)
00603   {
00604     uint cursorWidth = (caretStyle() == Replace && (cursorMaxWidth > 2)) ? cursorMaxWidth : 2;
00605     paint.fillRect(cursorXPos-xStart, 0, cursorWidth, fs->fontHeight, *cursorColor);
00606   }
00607 
00608   // show word wrap marker if desirable
00609   if (!isPrinterFriendly() && config()->wordWrapMarker() && fs->fixedPitch())
00610   {
00611     paint.setPen( config()->wordWrapMarkerColor() );
00612     int _x = m_doc->config()->wordWrapAt() * fs->myFontMetrics.width('x') - xStart;
00613     paint.drawLine( _x,0,_x,fs->fontHeight );
00614   }
00615 
00616   // cleanup ;)
00617   delete bracketStartRange;
00618   delete bracketEndRange;
00619 }
00620 
00621 uint KateRenderer::textWidth(const KateTextLine::Ptr &textLine, int cursorCol)
00622 {
00623   if (!textLine)
00624     return 0;
00625 
00626   int len = textLine->length();
00627 
00628   if (cursorCol < 0)
00629     cursorCol = len;
00630 
00631   KateFontStruct *fs = config()->fontStruct();
00632 
00633   int x = 0;
00634   int width;
00635   for (int z = 0; z < cursorCol; z++) {
00636     KateAttribute* a = attribute(textLine->attribute(z));
00637 
00638     if (z < len) {
00639       width = a->width(*fs, textLine->string(), z, m_tabWidth);
00640     } else {
00641       // DF: commented out. It happens all the time.
00642       //Q_ASSERT(!m_doc->wrapCursor());
00643       width = a->width(*fs, spaceChar, m_tabWidth);
00644     }
00645 
00646     x += width;
00647 
00648     if (textLine->getChar(z) == tabChar)
00649       x -= x % width;
00650   }
00651 
00652   return x;
00653 }
00654 
00655 uint KateRenderer::textWidth(const KateTextLine::Ptr &textLine, uint startcol, uint maxwidth, bool *needWrap, int *endX)
00656 {
00657   KateFontStruct *fs = config()->fontStruct();
00658   uint x = 0;
00659   uint endcol = startcol;
00660   int endX2 = 0;
00661   int lastWhiteSpace = -1;
00662   int lastWhiteSpaceX = -1;
00663 
00664   // used to not wrap a solitary word off the first line, ie. the
00665   // first line should not wrap until some characters have been displayed if possible
00666   bool foundNonWhitespace = startcol != 0;
00667   bool foundWhitespaceAfterNonWhitespace = startcol != 0;
00668 
00669   *needWrap = false;
00670 
00671   uint z = startcol;
00672   for (; z < textLine->length(); z++)
00673   {
00674     KateAttribute* a = attribute(textLine->attribute(z));
00675     int width = a->width(*fs, textLine->string(), z, m_tabWidth);
00676     Q_ASSERT(width);
00677     x += width;
00678 
00679     if (textLine->getChar(z).isSpace())
00680     {
00681       lastWhiteSpace = z+1;
00682       lastWhiteSpaceX = x;
00683 
00684       if (foundNonWhitespace)
00685         foundWhitespaceAfterNonWhitespace = true;
00686     }
00687     else
00688     {
00689       if (!foundWhitespaceAfterNonWhitespace) {
00690         foundNonWhitespace = true;
00691 
00692         lastWhiteSpace = z+1;
00693         lastWhiteSpaceX = x;
00694       }
00695     }
00696 
00697     // How should tabs be treated when they word-wrap on a print-out?
00698     // if startcol != 0, this messes up (then again, word wrapping messes up anyway)
00699     if (textLine->getChar(z) == tabChar)
00700       x -= x % width;
00701 
00702     if (x <= maxwidth)
00703     {
00704       if (lastWhiteSpace > -1)
00705       {
00706         endcol = lastWhiteSpace;
00707         endX2 = lastWhiteSpaceX;
00708       }
00709       else
00710       {
00711         endcol = z+1;
00712         endX2 = x;
00713       }
00714     }
00715     else if (z == startcol)
00716     {
00717       // require a minimum of 1 character advancement per call, even if it means drawing gets cut off
00718       // (geez gideon causes troubles with starting the views very small)
00719       endcol = z+1;
00720       endX2 = x;
00721     }
00722 
00723     if (x >= maxwidth)
00724     {
00725       *needWrap = true;
00726       break;
00727     }
00728   }
00729 
00730   if (*needWrap)
00731   {
00732     if (endX)
00733       *endX = endX2;
00734 
00735     return endcol;
00736   }
00737   else
00738   {
00739     if (endX)
00740       *endX = x;
00741 
00742     return z+1;
00743   }
00744 }
00745 
00746 uint KateRenderer::textWidth(const KateTextCursor &cursor)
00747 {
00748   int line = QMIN(QMAX(0, cursor.line()), (int)m_doc->numLines() - 1);
00749   int col = QMAX(0, cursor.col());
00750 
00751   return textWidth(m_doc->kateTextLine(line), col);
00752 }
00753 
00754 uint KateRenderer::textWidth( KateTextCursor &cursor, int xPos, uint startCol)
00755 {
00756   bool wrapCursor = m_doc->wrapCursor();
00757   int len;
00758   int x, oldX;
00759 
00760   KateFontStruct *fs = config()->fontStruct();
00761 
00762   if (cursor.line() < 0) cursor.setLine(0);
00763   if (cursor.line() > (int)m_doc->lastLine()) cursor.setLine(m_doc->lastLine());
00764   KateTextLine::Ptr textLine = m_doc->kateTextLine(cursor.line());
00765 
00766   if (!textLine) return 0;
00767 
00768   len = textLine->length();
00769 
00770   x = oldX = 0;
00771   int z = startCol;
00772   while (x < xPos && (!wrapCursor || z < len)) {
00773     oldX = x;
00774 
00775     KateAttribute* a = attribute(textLine->attribute(z));
00776 
00777     int width = 0;
00778 
00779     if (z < len)
00780       width = a->width(*fs, textLine->string(), z, m_tabWidth);
00781     else
00782       width = a->width(*fs, spaceChar, m_tabWidth);
00783 
00784     x += width;
00785 
00786     if (textLine->getChar(z) == tabChar)
00787       x -= x % width;
00788 
00789     z++;
00790   }
00791   if (xPos - oldX < x - xPos && z > 0) {
00792     z--;
00793     x = oldX;
00794   }
00795   cursor.setCol(z);
00796   return x;
00797 }
00798 
00799 const QFont *KateRenderer::currentFont()
00800 {
00801   return config()->font();
00802 }
00803 
00804 const QFontMetrics* KateRenderer::currentFontMetrics()
00805 {
00806   return config()->fontMetrics();
00807 }
00808 
00809 uint KateRenderer::textPos(uint line, int xPos, uint startCol, bool nearest)
00810 {
00811   return textPos(m_doc->kateTextLine(line), xPos, startCol, nearest);
00812 }
00813 
00814 uint KateRenderer::textPos(const KateTextLine::Ptr &textLine, int xPos, uint startCol, bool nearest)
00815 {
00816   Q_ASSERT(textLine);
00817   if (!textLine)
00818     return 0;
00819 
00820   KateFontStruct *fs = config()->fontStruct();
00821 
00822   int x, oldX;
00823   x = oldX = 0;
00824 
00825   uint z = startCol;
00826   uint len= textLine->length();
00827   while ( (x < xPos)  && (z < len)) {
00828     oldX = x;
00829 
00830     KateAttribute* a = attribute(textLine->attribute(z));
00831     x += a->width(*fs, textLine->string(), z, m_tabWidth);
00832 
00833     z++;
00834   }
00835   if ( ( (! nearest) || xPos - oldX < x - xPos ) && z > 0 ) {
00836     z--;
00837    // newXPos = oldX;
00838   }// else newXPos = x;
00839   return z;
00840 }
00841 
00842 uint KateRenderer::fontHeight()
00843 {
00844   return config()->fontStruct ()->fontHeight;
00845 }
00846 
00847 uint KateRenderer::documentHeight()
00848 {
00849   return m_doc->numLines() * fontHeight();
00850 }
00851 
00852 bool KateRenderer::getSelectionBounds(uint line, uint lineLength, uint &start, uint &end)
00853 {
00854   bool hasSel = false;
00855 
00856   if (m_doc->hasSelection() && !m_doc->blockSelect)
00857   {
00858     if (m_doc->lineIsSelection(line))
00859     {
00860       start = m_doc->selectStart.col();
00861       end = m_doc->selectEnd.col();
00862       hasSel = true;
00863     }
00864     else if ((int)line == m_doc->selectStart.line())
00865     {
00866       start = m_doc->selectStart.col();
00867       end = lineLength;
00868       hasSel = true;
00869     }
00870     else if ((int)line == m_doc->selectEnd.line())
00871     {
00872       start = 0;
00873       end = m_doc->selectEnd.col();
00874       hasSel = true;
00875     }
00876   }
00877   else if (m_doc->lineHasSelected(line))
00878   {
00879     start = m_doc->selectStart.col();
00880     end = m_doc->selectEnd.col();
00881     hasSel = true;
00882   }
00883 
00884   if (start > end) {
00885     int temp = end;
00886     end = start;
00887     start = temp;
00888   }
00889 
00890   return hasSel;
00891 }
00892 
00893 void KateRenderer::updateConfig ()
00894 {
00895   // update the attibute list pointer
00896   updateAttributes ();
00897 
00898   if (m_view)
00899     m_view->updateRendererConfig();
00900 }
00901 
00902 uint KateRenderer::spaceWidth()
00903 {
00904   return attribute(0)->width(*config()->fontStruct(), spaceChar, m_tabWidth);
00905 }
00906 
00907 // kate: space-indent on; indent-width 2; replace-tabs on;
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This file is part of the documentation for kate Library Version 3.4.2.
Documentation copyright © 1996-2004 the KDE developers.
Generated on Wed Feb 8 06:26:24 2006 by doxygen 1.4.4 written by Dimitri van Heesch, © 1997-2003