tdelibs/kate/part/katerenderer.cpp

/* This file is part of the KDE libraries
   Copyright (C) 2003 Hamish Rodda <rodda@kde.org>
   Copyright (C) 2001 Christoph Cullmann <cullmann@kde.org>
   Copyright (C) 2001 Joseph Wenninger <jowenn@kde.org>
   Copyright (C) 1999 Jochen Wilhelmy <digisnap@cs.tu-berlin.de>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License version 2 as published by the Free Software Foundation.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
*/

#include "katerenderer.h"

#include "katelinerange.h"
#include "katedocument.h"
#include "katearbitraryhighlight.h"
#include "kateconfig.h"
#include "katehighlight.h"
#include "katefactory.h"
#include "kateview.h"

#include <kdebug.h>

#include <tqpainter.h>
#include <tqpopupmenu.h>

KateRenderer::KateRenderer(KateDocument* doc, KateView *view)
  : m_doc(doc), m_view (view), m_caretStyle(KateRenderer::Insert)
    , m_drawCaret(true)
    , m_showSelections(true)
    , m_showTabs(true)
    , m_printerFriendly(false)
{
  KateFactory::self()->registerRenderer ( this );
  m_config = new KateRendererConfig (this);

  m_tabWidth = m_doc->config()->tabWidth();
  m_indentWidth = m_tabWidth;
  if (m_doc->config()->configFlags() & KateDocumentConfig::cfSpaceIndent)
  {
    m_indentWidth = m_doc->config()->indentationWidth();
  }

  updateAttributes ();
}

KateRenderer::~KateRenderer()
{
  delete m_config;
  KateFactory::self()->deregisterRenderer ( this );
}

void KateRenderer::updateAttributes ()
{
  m_schema = config()->schema ();
  m_attributes = m_doc->highlight()->attributes (m_schema);
}

KateAttribute* KateRenderer::attribute(uint pos)
{
  if (pos < m_attributes->size())
    return &m_attributes->at(pos);

  return &m_attributes->at(0);
}

void KateRenderer::setDrawCaret(bool drawCaret)
{
  m_drawCaret = drawCaret;
}

void KateRenderer::setCaretStyle(KateRenderer::caretStyles style)
{
  m_caretStyle = style;
}

void KateRenderer::setShowTabs(bool showTabs)
{
  m_showTabs = showTabs;
}

void KateRenderer::setTabWidth(int tabWidth)
{
  m_tabWidth = tabWidth;
}

bool KateRenderer::showIndentLines() const
{
  return m_config->showIndentationLines();
}

void KateRenderer::setShowIndentLines(bool showIndentLines)
{
  m_config->setShowIndentationLines(showIndentLines);
}

void KateRenderer::setIndentWidth(int indentWidth)
{
  m_indentWidth = m_tabWidth;
  if (m_doc->config()->configFlags() & KateDocumentConfig::cfSpaceIndent)
  {
    m_indentWidth = indentWidth;
  }
}

void KateRenderer::setShowSelections(bool showSelections)
{
  m_showSelections = showSelections;
}

void KateRenderer::increaseFontSizes()
{
  TQFont f ( *config()->font () );
  f.setPointSize (f.pointSize ()+1);

  config()->setFont (f);
}

void KateRenderer::decreaseFontSizes()
{
  TQFont f ( *config()->font () );

  if ((f.pointSize ()-1) > 0)
    f.setPointSize (f.pointSize ()-1);

  config()->setFont (f);
}

bool KateRenderer::isPrinterFriendly() const
{
  return m_printerFriendly;
}

void KateRenderer::setPrinterFriendly(bool printerFriendly)
{
  m_printerFriendly = printerFriendly;
  setShowTabs(false);
  setShowSelections(false);
  setDrawCaret(false);
}

bool KateRenderer::paintTextLineBackground(TQPainter& paint, int line, bool isCurrentLine, int xStart, int xEnd)
{
  if (isPrinterFriendly())
    return false;

  // font data
  KateFontStruct *fs = config()->fontStruct();

  // Normal background color
  TQColor backgroundColor( config()->backgroundColor() );

  bool selectionPainted = false;
  if (showSelections() && m_view->lineSelected(line))
  {
    backgroundColor = config()->selectionColor();
    selectionPainted = true;
  }
  else
  {
    // paint the current line background if we're on the current line
    if (isCurrentLine)
      backgroundColor = config()->highlightedLineColor();

    // Check for mark background
    int markRed = 0, markGreen = 0, markBlue = 0, markCount = 0;

    // Retrieve marks for this line
    uint mrk = m_doc->mark( line );
    if (mrk)
    {
      for (uint bit = 0; bit < 32; bit++)
      {
        KTextEditor::MarkInterface::MarkTypes markType = (KTextEditor::MarkInterface::MarkTypes)(1<<bit);
        if (mrk & markType)
        {
          TQColor markColor = config()->lineMarkerColor(markType);

          if (markColor.isValid()) {
            markCount++;
            markRed += markColor.red();
            markGreen += markColor.green();
            markBlue += markColor.blue();
          }
        }
      } // for
    } // Marks

    if (markCount) {
      markRed /= markCount;
      markGreen /= markCount;
      markBlue /= markCount;
      backgroundColor.setRgb(
        int((backgroundColor.red() * 0.9) + (markRed * 0.1)),
        int((backgroundColor.green() * 0.9) + (markGreen * 0.1)),
        int((backgroundColor.blue() * 0.9) + (markBlue * 0.1))
      );
    }
  } // background preprocessing

  // Draw line background
  paint.fillRect(0, 0, xEnd - xStart, fs->fontHeight, backgroundColor);

  return selectionPainted;
}

void KateRenderer::paintWhitespaceMarker(TQPainter &paint, uint x, uint y)
{
  TQPen penBackup( paint.pen() );
  paint.setPen( config()->tabMarkerColor() );
  paint.drawPoint(x,     y);
  paint.drawPoint(x + 1, y);
  paint.drawPoint(x,     y - 1);
  paint.setPen( penBackup );
}


void KateRenderer::paintIndentMarker(TQPainter &paint, uint x, uint row)
{
  TQPen penBackup( paint.pen() );
  paint.setPen( config()->tabMarkerColor() );

  const int top = paint.window().top();
  const int bottom = paint.window().bottom();
  const int h = bottom - top + 1;

  // Dot padding.
  int pad = 0;
  if(row & 1 && h & 1) pad = 1;

  for(int i = top; i <= bottom; i++)
  {
    if((i + pad) & 1)
    {
      paint.drawPoint(x + 2, i);
    }
  }

  paint.setPen( penBackup );
}


void KateRenderer::paintTextLine(TQPainter& paint, const KateLineRange* range, int xStart, int xEnd, const KateTextCursor* cursor, const KateBracketRange* bracketmark)
{
  int line = range->line;

  // textline
  KateTextLine::Ptr textLine = m_doc->kateTextLine(line);
  if (!textLine)
    return;

  bool showCursor = drawCaret() && cursor && range->includesCursor(*cursor);

  KateSuperRangeList& superRanges = m_doc->arbitraryHL()->rangesIncluding(range->line, 0);

  int minIndent = 0;

  // A bit too verbose for my tastes
  // Re-write a bracketmark class? put into its own function? add more helper constructors to the range stuff?
  // Also, need a light-weight arbitraryhighlightrange class for static stuff
  KateArbitraryHighlightRange* bracketStartRange (0L);
  KateArbitraryHighlightRange* bracketEndRange (0L);
  if (bracketmark && bracketmark->isValid()) {
    if (range->includesCursor(bracketmark->start())) {
      KateTextCursor startend = bracketmark->start();
      startend.setCol(startend.col()+1);
      bracketStartRange = new KateArbitraryHighlightRange(m_doc, bracketmark->start(), startend);
      bracketStartRange->setBGColor(config()->highlightedBracketColor());
      bracketStartRange->setBold(true);
      superRanges.append(bracketStartRange);
    }

    if (range->includesCursor(bracketmark->end())) {
      KateTextCursor endend = bracketmark->end();
      endend.setCol(endend.col()+1);
      bracketEndRange = new KateArbitraryHighlightRange(m_doc, bracketmark->end(), endend);
      bracketEndRange->setBGColor(config()->highlightedBracketColor());
      bracketEndRange->setBold(true);
      superRanges.append(bracketEndRange);
    }

    Q_ASSERT(bracketmark->start().line() <= bracketmark->end().line());
    if (bracketmark->start().line() < line && bracketmark->end().line() >= line)
    {
      minIndent = bracketmark->getMinIndent();
    }
  }


  // length, chars + raw attribs
  uint len = textLine->length();
  uint oldLen = len;

  // should the cursor be painted (if it is in the current xstart - xend range)
  bool cursorVisible = false;
  int cursorMaxWidth = 0;

  // font data
  KateFontStruct * fs = config()->fontStruct();

  // Paint selection background as the whole line is selected
  // selection startcol/endcol calc
  bool hasSel = false;
  uint startSel = 0;
  uint endSel = 0;

  // was the selection background already completely painted ?
  bool selectionPainted = false;
  bool isCurrentLine = (cursor && range->includesCursor(*cursor));
  selectionPainted = paintTextLineBackground(paint, line, isCurrentLine, xStart, xEnd);
  if (selectionPainted)
  {
    hasSel = true;
    startSel = 0;
    endSel = len + 1;
  }

  int startcol = range->startCol;
  if (startcol > (int)len)
    startcol = len;

  if (startcol < 0)
    startcol = 0;

  int endcol = range->wrap ? range->endCol : -1;
  if (endcol < 0)
    len = len - startcol;
  else
    len = endcol - startcol;

  // text attribs font/style data
  KateAttribute* attr = m_doc->highlight()->attributes(m_schema)->data();

  const TQColor *cursorColor = &attr[0].textColor();

  // Start arbitrary highlighting
  KateTextCursor currentPos(line, startcol);
  superRanges.firstBoundary(&currentPos);

  if (showSelections() && !selectionPainted)
    hasSel = getSelectionBounds(line, oldLen, startSel, endSel);

  // Draws the dashed underline at the start of a folded block of text.
  if (range->startsInvisibleBlock) {
    paint.setPen(TQPen(config()->wordWrapMarkerColor(), 1, Qt::DashLine));
    paint.drawLine(0, fs->fontHeight - 1, xEnd - xStart, fs->fontHeight - 1);
  }

  // draw word-wrap-honor-indent filling
  if (range->xOffset() && range->xOffset() > xStart)
  {
    paint.fillRect(0, 0, range->xOffset() - xStart, fs->fontHeight,
      TQBrush(config()->wordWrapMarkerColor(), TQBrush::DiagCrossPattern));
  }

  // painting loop
  uint xPos = range->xOffset();
  int cursorXPos = 0;

  // Optimisation to quickly draw an empty line of text
  if (len < 1)
  {
    if (showCursor && (cursor->col() >= int(startcol)))
    {
      cursorVisible = true;
      cursorXPos = xPos + cursor->col() * fs->myFontMetrics.width(TQChar(' '));
    }
  }
  else
  {
    bool isIMSel  = false;
    bool isIMEdit = false;

    bool isSel = false;

    KateAttribute customHL;

    const TQColor *curColor = 0;
    const TQColor *oldColor = 0;

    KateAttribute* oldAt = &attr[0];

    uint oldXPos = xPos;
    uint xPosAfter = xPos;

    KateAttribute currentHL;

    uint blockStartCol = startcol;
    uint curCol = startcol;
    uint nextCol = curCol + 1;

    // text + attrib data from line
    const uchar *textAttributes = textLine->attributes ();
    bool noAttribs = !textAttributes;

    // adjust to startcol ;)
    textAttributes = textAttributes + startcol;

    uint atLen = m_doc->highlight()->attributes(m_schema)->size();

    // Determine if we have trailing whitespace and store the column
    // if lastChar == -1, set to 0, if lastChar exists, increase by one
    uint trailingWhitespaceColumn = textLine->lastChar() + 1;
    const uint lastIndentColumn = textLine->firstChar();

    // Could be precomputed.
    const uint spaceWidth = fs->width (TQChar(' '), false, false, m_tabWidth);

    // Get current x position.
    int curPos = textLine->cursorX(curCol, m_tabWidth);

    while (curCol - startcol < len)
    {
      // make sure curPos is updated correctly.
      // ### if uncommented, causes an O(n^2) behaviour
      //Q_ASSERT(curPos == textLine->cursorX(curCol, m_tabWidth));

      TQChar curChar = textLine->string()[curCol];
      // Decide if this character is a tab - we treat the spacing differently
      // TODO: move tab width calculation elsewhere?
      bool isTab = curChar == TQChar('\t');

      // Determine current syntax highlighting attribute
      // A bit legacy but doesn't need to change
      KateAttribute* curAt = (noAttribs || ((*textAttributes) >= atLen)) ? &attr[0] : &attr[*textAttributes];

      // X position calculation. Incorrect for fonts with non-zero leftBearing() and rightBearing() results.
      // TODO: make internal charWidth() function, use TQFontMetrics::charWidth().
      xPosAfter += curAt->width(*fs, curChar, m_tabWidth);

      // Tab special treatment, move to charWidth().
      if (isTab)
        xPosAfter -= (xPosAfter % curAt->width(*fs, curChar, m_tabWidth));

      // Only draw after the starting X value
      // Haha, this was always wrong, due to the use of individual char width calculations...?? :(
      if ((int)xPosAfter >= xStart)
      {
        // Determine if we're in a selection and should be drawing it
        isSel = (showSelections() && hasSel && (curCol >= startSel) && (curCol < endSel));

        // input method edit area
        isIMEdit = m_view && m_view->isIMEdit( line, curCol );

        // input method selection
        isIMSel = m_view && m_view->isIMSelection( line, curCol );

        // Determine current color, taking into account selection
        curColor = isSel ? &(curAt->selectedTextColor()) : &(curAt->textColor());

        // Incorporate in arbitrary highlighting
        if (curAt != oldAt || curColor != oldColor || (superRanges.count() && superRanges.currentBoundary() && *(superRanges.currentBoundary()) == currentPos)) {
          if (superRanges.count() && superRanges.currentBoundary() && *(superRanges.currentBoundary()) == currentPos)
            customHL = KateArbitraryHighlightRange::merge(superRanges.rangesIncluding(currentPos));

          KateAttribute hl = customHL;

          hl += *curAt;

          // use default highlighting color if we haven't defined one above.
          if (!hl.itemSet(KateAttribute::TextColor))
            hl.setTextColor(*curColor);

          if (!isSel)
            paint.setPen(hl.textColor());
          else
            paint.setPen(hl.selectedTextColor());

          paint.setFont(hl.font(*currentFont()));

          if (superRanges.currentBoundary() && *(superRanges.currentBoundary()) == currentPos)
            superRanges.nextBoundary();

          currentHL = hl;
        }

        // Determine whether we can delay painting to draw a block of similarly formatted
        // characters or not
        // Reasons for NOT delaying the drawing until the next character
        // You have to detect the change one character in advance.
        // TODO: KateAttribute::canBatchRender()
        bool renderNow = false;
        if ((isTab)
          // formatting has changed OR
          || (superRanges.count() && superRanges.currentBoundary() && *(superRanges.currentBoundary()) == KateTextCursor(line, nextCol))

          // it is the end of the line OR
          || (curCol - startcol >= len - 1)

          // the rest of the line is trailing whitespace OR
          || (curCol + 1 >= trailingWhitespaceColumn)

          // indentation lines OR
          || (showIndentLines() && curCol < lastIndentColumn)

          // the x position is past the end OR
          || ((int)xPos > xEnd)

          // it is a different attribute OR
          || (!noAttribs && curAt != &attr[*(textAttributes+1)])

          // the selection boundary was crossed OR
          || (isSel != (hasSel && (nextCol >= startSel) && (nextCol < endSel)))

          // the next char is a tab (removed the "and this isn't" because that's dealt with above)
          // i.e. we have to draw the current text so the tab can be rendered as above.
          || (textLine->string()[nextCol] == TQChar('\t'))

          // input method edit area
          || ( m_view && (isIMEdit != m_view->isIMEdit( line, nextCol )) )

          // input method selection
          || ( m_view && (isIMSel !=  m_view->isIMSelection( line, nextCol )) )
        )
        {
          renderNow = true;
        }

        if (renderNow)
        {
          if (!isPrinterFriendly())
          {
            bool paintBackground = true;
            uint width = xPosAfter - oldXPos;
            TQColor fillColor;

            if (isIMSel && !isTab)
            {
              // input method selection
              fillColor = m_view->colorGroup().color(TQColorGroup::Foreground);
            }
            else if (isIMEdit && !isTab)
            {
              // XIM support
              // input method edit area
              const TQColorGroup& cg = m_view->colorGroup();
              int h1, s1, v1, h2, s2, v2;
              TQColor(cg.color( TQColorGroup::Base )).hsv( &h1, &s1, &v1 );
              TQColor(cg.color( TQColorGroup::Background )).hsv( &h2, &s2, &v2 );
              fillColor.setHsv( h1, s1, ( v1 + v2 ) / 2 );
            }
            else if (!selectionPainted && (isSel || currentHL.itemSet(KateAttribute::BGColor)))
            {
              if (isSel)
              {
                fillColor = config()->selectionColor();

                // If this is the last block of text, fill up to the end of the line if the
                // selection stretches that far
                if ((curCol >= len - 1) && m_view->lineEndSelected (line, endcol))
                  width = xEnd - oldXPos;
              }
              else
              {
                fillColor = currentHL.bgColor();
              }
            }
            else
            {
              paintBackground = false;
            }

            if (paintBackground)
              paint.fillRect(oldXPos - xStart, 0, width, fs->fontHeight, fillColor);

            if (isIMSel && paintBackground && !isTab)
            {
              paint.save();
              paint.setPen( m_view->colorGroup().color( TQColorGroup::BrightText ) );
            }

            // Draw indentation markers.
            if (showIndentLines() && curCol < lastIndentColumn)
            {
              // Draw multiple guides when tab width greater than indent width.
              const int charWidth = isTab ? m_tabWidth - curPos % m_tabWidth : 1;

              // Do not draw indent guides on the first line.
              int i = 0;
              if (curPos == 0 || curPos % m_indentWidth > 0)
                i = m_indentWidth - curPos % m_indentWidth;

              for (; i < charWidth; i += m_indentWidth)
              {
                // In most cases this is done one or zero times.
                paintIndentMarker(paint, xPos - xStart + i * spaceWidth, line);

                // Draw highlighted line.
                if (curPos+i == minIndent)
                {
                  paintIndentMarker(paint, xPos - xStart + 1 + i * spaceWidth, line+1);
                }
              }
            }
          }

          // or we will see no text ;)
          int y = fs->fontAscent;

          // make sure we redraw the right character groups on attrib/selection changes
          // Special case... de-special case some of it
          if (isTab || (curCol >= trailingWhitespaceColumn))
          {
            // Draw spaces too, because it might be eg. underlined
            static TQString spaces;
            if (int(spaces.length()) != m_tabWidth)
              spaces.fill(' ', m_tabWidth);

            paint.drawText(oldXPos-xStart, y, isTab ? spaces : TQString(" "));

            if (showTabs())
            {
            // trailing spaces and tabs may also have to be different options.
            //  if( curCol >= lastIndentColumn )
              paintWhitespaceMarker(paint, xPos - xStart, y);
            }

            // variable advancement
            blockStartCol = nextCol;
            oldXPos = xPosAfter;
          }
          else
          {
            // Here's where the money is...
            paint.drawText(oldXPos-xStart, y, textLine->string(), blockStartCol, nextCol-blockStartCol);

            // Draw preedit's underline
            if (isIMEdit) {
              TQRect r( oldXPos - xStart, 0, xPosAfter - oldXPos, fs->fontHeight );
              paint.drawLine( r.bottomLeft(), r.bottomRight() );
            }

            // Put pen color back
            if (isIMSel) paint.restore();

            // We're done drawing?
            if ((int)xPos > xEnd)
              break;

            // variable advancement
            blockStartCol = nextCol;
            oldXPos = xPosAfter;
            //oldS = s+1;
          }
        } // renderNow

        // determine cursor X position
        if (showCursor && (cursor->col() == int(curCol)))
        {
          cursorVisible = true;
          cursorXPos = xPos;
          cursorMaxWidth = xPosAfter - xPos;
          cursorColor = &curAt->textColor();
        }
      } // xPosAfter >= xStart
      else
      {
        // variable advancement
        blockStartCol = nextCol;
        oldXPos = xPosAfter;
      }

      // increase xPos
      xPos = xPosAfter;

      // increase attribs pos
      textAttributes++;

      // to only switch font/color if needed
      oldAt = curAt;
      oldColor = curColor;

      // col move
      curCol++;
      nextCol++;
      currentPos.setCol(currentPos.col() + 1);

      // Update the current indentation pos.
      if (isTab)
      {
        curPos += m_tabWidth - (curPos % m_tabWidth);
      }
      else
      {
        curPos++;
      }
    }

    // If this line has a partial selection that's the start of a multi-line selection,
    // we have to fill areas on the right side of the text with the selection color.
    if (showSelections() && hasSel && !selectionPainted && xStart >= (int)xPos && m_view->lineEndSelected(line, -1))
    {
      paint.fillRect(0, 0, xEnd-xStart, fs->fontHeight, config()->selectionColor());
    }

    // Determine cursor position (if it is not within the range being drawn)
    if (showCursor && (cursor->col() >= int(curCol)))
    {
      cursorVisible = true;
      cursorXPos = xPos + (cursor->col() - int(curCol)) * fs->myFontMetrics.width(TQChar(' '));
      cursorMaxWidth = xPosAfter - xPos;
      cursorColor = &oldAt->textColor();
    }
  }

  // Paint cursor
  if (cursorVisible)
  {
    uint cursorWidth = (caretStyle() == Replace && (cursorMaxWidth > 2)) ? cursorMaxWidth : 2;
    paint.fillRect(cursorXPos-xStart, 0, cursorWidth, fs->fontHeight, *cursorColor);
  }

  // show word wrap marker if desirable
  if (!isPrinterFriendly() && config()->wordWrapMarker() && fs->fixedPitch())
  {
    paint.setPen( config()->wordWrapMarkerColor() );
    int _x = m_doc->config()->wordWrapAt() * fs->myFontMetrics.width('x') - xStart;
    paint.drawLine( _x,0,_x,fs->fontHeight );
  }

  // cleanup ;)
  delete bracketStartRange;
  delete bracketEndRange;
}

uint KateRenderer::textWidth(const KateTextLine::Ptr &textLine, int cursorCol)
{
  if (!textLine)
    return 0;

  const int len = textLine->length();

  if (cursorCol < 0)
    cursorCol = len;

  KateFontStruct *fs = config()->fontStruct();

  const TQChar *tqunicode = textLine->text();
  const TQString &textString = textLine->string();

  int x = 0;
  int width;
  for (int z = 0; z < cursorCol; z++) {
    KateAttribute* a = attribute(textLine->attribute(z));

    if (z < len) {
      width = a->width(*fs, textString, z, m_tabWidth);
    } else {
      // DF: commented out. It happens all the time.
      //Q_ASSERT(!m_doc->wrapCursor());
      width = a->width(*fs, TQChar(' '), m_tabWidth);
    }

    x += width;

    if (z < len && tqunicode[z] == TQChar('\t'))
      x -= x % width;
  }

  return x;
}

uint KateRenderer::textWidth(const KateTextLine::Ptr &textLine, uint startcol, uint maxwidth, bool *needWrap, int *endX)
{
  KateFontStruct *fs = config()->fontStruct();
  uint x = 0;
  uint endcol = startcol;
  int endX2 = 0;
  int lastWhiteSpace = -1;
  int lastWhiteSpaceX = -1;

  // used to not wrap a solitary word off the first line, ie. the
  // first line should not wrap until some characters have been displayed if possible
  bool foundNonWhitespace = startcol != 0;
  bool foundWhitespaceAfterNonWhitespace = startcol != 0;

  *needWrap = false;

  const uint len = textLine->length();
  const TQChar *tqunicode = textLine->text();
  const TQString &textString = textLine->string();

  uint z = startcol;
  for (; z < len; z++)
  {
    KateAttribute* a = attribute(textLine->attribute(z));
    int width = a->width(*fs, textString, z, m_tabWidth);
    Q_ASSERT(width);
    x += width;

    // How should tabs be treated when they word-wrap on a print-out?
    // if startcol != 0, this messes up (then again, word wrapping messes up anyway)
    if (tqunicode[z] == TQChar('\t'))
      x -= x % width;

    if (tqunicode[z].isSpace())
    {
      lastWhiteSpace = z+1;
      lastWhiteSpaceX = x;

      if (foundNonWhitespace)
        foundWhitespaceAfterNonWhitespace = true;
    }
    else
    {
      if (!foundWhitespaceAfterNonWhitespace) {
        foundNonWhitespace = true;

        lastWhiteSpace = z+1;
        lastWhiteSpaceX = x;
      }
    }

    if (x <= maxwidth)
    {
      if (lastWhiteSpace > -1)
      {
        endcol = lastWhiteSpace;
        endX2 = lastWhiteSpaceX;
      }
      else
      {
        endcol = z+1;
        endX2 = x;
      }
    }
    else if (z == startcol)
    {
      // require a minimum of 1 character advancement per call, even if it means drawing gets cut off
      // (geez gideon causes troubles with starting the views very small)
      endcol = z+1;
      endX2 = x;
    }

    if (x >= maxwidth)
    {
      *needWrap = true;
      break;
    }
  }

  if (*needWrap)
  {
    if (endX)
      *endX = endX2;

    return endcol;
  }
  else
  {
    if (endX)
      *endX = x;

    return z+1;
  }
}

uint KateRenderer::textWidth(const KateTextCursor &cursor)
{
  int line = kMin(kMax(0, cursor.line()), (int)m_doc->numLines() - 1);
  int col = kMax(0, cursor.col());

  return textWidth(m_doc->kateTextLine(line), col);
}

uint KateRenderer::textWidth( KateTextCursor &cursor, int xPos, uint startCol)
{
  bool wrapCursor = m_view->wrapCursor();
  int x, oldX;

  KateFontStruct *fs = config()->fontStruct();

  if (cursor.line() < 0) cursor.setLine(0);
  if (cursor.line() > (int)m_doc->lastLine()) cursor.setLine(m_doc->lastLine());
  KateTextLine::Ptr textLine = m_doc->kateTextLine(cursor.line());

  if (!textLine) return 0;

  const uint len = textLine->length();
  const TQChar *tqunicode = textLine->text();
  const TQString &textString = textLine->string();

  x = oldX = 0;
  uint z = startCol;
  while (x < xPos && (!wrapCursor || z < len)) {
    oldX = x;

    KateAttribute* a = attribute(textLine->attribute(z));

    int width = 0;

    if (z < len)
      width = a->width(*fs, textString, z, m_tabWidth);
    else
      width = a->width(*fs, TQChar(' '), m_tabWidth);

    x += width;

    if (z < len && tqunicode[z] == TQChar('\t'))
      x -= x % width;

    z++;
  }
  if (xPos - oldX < x - xPos && z > 0) {
    z--;
    x = oldX;
  }
  cursor.setCol(z);
  return x;
}

const TQFont *KateRenderer::currentFont()
{
  return config()->font();
}

const TQFontMetrics* KateRenderer::currentFontMetrics()
{
  return config()->fontMetrics();
}

uint KateRenderer::textPos(uint line, int xPos, uint startCol, bool nearest)
{
  return textPos(m_doc->kateTextLine(line), xPos, startCol, nearest);
}

uint KateRenderer::textPos(const KateTextLine::Ptr &textLine, int xPos, uint startCol, bool nearest)
{
  Q_ASSERT(textLine);
  if (!textLine)
    return 0;

  KateFontStruct *fs = config()->fontStruct();

  int x, oldX;
  x = oldX = 0;

  uint z = startCol;
  const uint len = textLine->length();
  const TQString &textString = textLine->string();

  while ( (x < xPos)  && (z < len)) {
    oldX = x;

    KateAttribute* a = attribute(textLine->attribute(z));
    x += a->width(*fs, textString, z, m_tabWidth);

    z++;
  }
  if ( ( (! nearest) || xPos - oldX < x - xPos ) && z > 0 ) {
    z--;
   // newXPos = oldX;
  }// else newXPos = x;
  return z;
}

uint KateRenderer::fontHeight()
{
  return config()->fontStruct ()->fontHeight;
}

uint KateRenderer::documentHeight()
{
  return m_doc->numLines() * fontHeight();
}

bool KateRenderer::getSelectionBounds(uint line, uint lineLength, uint &start, uint &end)
{
  bool hasSel = false;

  if (m_view->hasSelection() && !m_view->blockSelectionMode())
  {
    if (m_view->lineIsSelection(line))
    {
      start = m_view->selStartCol();
      end = m_view->selEndCol();
      hasSel = true;
    }
    else if ((int)line == m_view->selStartLine())
    {
      start = m_view->selStartCol();
      end = lineLength;
      hasSel = true;
    }
    else if ((int)line == m_view->selEndLine())
    {
      start = 0;
      end = m_view->selEndCol();
      hasSel = true;
    }
  }
  else if (m_view->lineHasSelected(line))
  {
    start = m_view->selStartCol();
    end = m_view->selEndCol();
    hasSel = true;
  }

  if (start > end) {
    int temp = end;
    end = start;
    start = temp;
  }

  return hasSel;
}

void KateRenderer::updateConfig ()
{
  // update the attibute list pointer
  updateAttributes ();

  if (m_view)
    m_view->updateRendererConfig();
}

uint KateRenderer::spaceWidth()
{
  return attribute(0)->width(*config()->fontStruct(), TQChar(' '), m_tabWidth);
}

// kate: space-indent on; indent-width 2; replace-tabs on;