TEWidget.cpp

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/* ------------------------------------------------------------------------ */
/*                                                                          */
/* [TEWidget.C]            Terminal Emulation Widget                        */
/*                                                                          */
/* ------------------------------------------------------------------------ */
/*                                                                          */
/* Copyright (c) 1997,1998 by Lars Doelle <lars.doelle@on-line.de>          */
/*                                                                          */
/* This file is part of Konsole - an X terminal for KDE                     */
/*                                                                          */
/* ------------------------------------------------------------------------ */
/*                        */
/* Ported Konsole to Qt/Embedded                                              */
/*                        */
/* Copyright (C) 2000 by John Ryland <jryland@trolltech.com>                  */
/*                        */
/* -------------------------------------------------------------------------- */
/* FIXME:
   - 'image' may also be used uninitialized (it isn't in fact) in resizeEvent
   - 'font_a' not used in mouse events
   - add destructor
*/

/* TODO
   - evtl. be sensitive to `paletteChange' while using default colors.
   - set different 'rounding' styles? I.e. have a mode to show clipped chars?
*/

// #include "config.h"
#include "TEWidget.h"
#include "session.h"
#include <qpe/config.h>


#if !(QT_NO_COP)
#include <qpe/qcopenvelope_qws.h>
#endif

#include <qclipboard.h>

#ifndef QT_NO_DRAGANDDROP
#include <qdragobject.h>
#include <qfile.h>
#endif

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <signal.h>

#include <assert.h>

// #include "TEWidget.moc"
//#include <kapp.h>
//#include <kcursor.h>
//#include <kurl.h>
//#include <kdebug.h>
//#include <klocale.h>

#define HERE printf("%s(%d): %s\n",__FILE__,__LINE__,__FUNCTION__)
#define HCNT(Name) // { static int cnt = 1; printf("%s(%d): %s %d\n",__FILE__,__LINE__,Name,cnt++); }

#define loc(X,Y) ((Y)*columns+(X))

//FIXME: the rim should normally be 1, 0 only when running in full screen mode.
#define rimX 0      // left/right rim width
#define rimY 0      // top/bottom rim high

#define SCRWIDTH 16 // width of the scrollbar

#define yMouseScroll 1
// scroll increment used when dragging selection at top/bottom of window.

/* ------------------------------------------------------------------------- */
/*                                                                           */
/*                                Colors                                     */
/*                                                                           */
/* ------------------------------------------------------------------------- */

//FIXME: the default color table is in session.C now.
//       We need a way to get rid of this one, here.
static const ColorEntry base_color_table[TABLE_COLORS] =
// The following are almost IBM standard color codes, with some slight
// gamma correction for the dim colors to compensate for bright X screens.
// It contains the 8 ansiterm/xterm colors in 2 intensities.
{
  // Fixme: could add faint colors here, also.
  // normal
  ColorEntry(QColor(0x00,0x00,0x00), 0, 0 ), ColorEntry( QColor(0xB2,0xB2,0xB2), 1, 0 ), // Dfore, Dback
  ColorEntry(QColor(0x00,0x00,0x00), 0, 0 ), ColorEntry( QColor(0xB2,0x18,0x18), 0, 0 ), // Black, Red
  ColorEntry(QColor(0x18,0xB2,0x18), 0, 0 ), ColorEntry( QColor(0xB2,0x68,0x18), 0, 0 ), // Green, Yellow
  ColorEntry(QColor(0x18,0x18,0xB2), 0, 0 ), ColorEntry( QColor(0xB2,0x18,0xB2), 0, 0 ), // Blue,  Magenta
  ColorEntry(QColor(0x18,0xB2,0xB2), 0, 0 ), ColorEntry( QColor(0xB2,0xB2,0xB2), 0, 0 ), // Cyan,  White
  // intensiv
  ColorEntry(QColor(0x00,0x00,0x00), 0, 1 ), ColorEntry( QColor(0xFF,0xFF,0xFF), 1, 0 ),
  ColorEntry(QColor(0x68,0x68,0x68), 0, 0 ), ColorEntry( QColor(0xFF,0x54,0x54), 0, 0 ),
  ColorEntry(QColor(0x54,0xFF,0x54), 0, 0 ), ColorEntry( QColor(0xFF,0xFF,0x54), 0, 0 ),
  ColorEntry(QColor(0x54,0x54,0xFF), 0, 0 ), ColorEntry( QColor(0xB2,0x18,0xB2), 0, 0 ),
  ColorEntry(QColor(0x54,0xFF,0xFF), 0, 0 ), ColorEntry( QColor(0xFF,0xFF,0xFF), 0, 0 )
};

/* Note that we use ANSI color order (bgr), while IBMPC color order is (rgb)

   Code        0       1       2       3       4       5       6       7
   ----------- ------- ------- ------- ------- ------- ------- ------- -------
   ANSI  (bgr) Black   Red     Green   Yellow  Blue    Magenta Cyan    White
   IBMPC (rgb) Black   Blue    Green   Cyan    Red     Magenta Yellow  White
*/

QColor TEWidget::getDefaultBackColor()
{
  return color_table[DEFAULT_BACK_COLOR].color;
}

const ColorEntry* TEWidget::getColorTable() const
{
  return color_table;
}

const ColorEntry* TEWidget::getdefaultColorTable() const
{
  return base_color_table;
}


const QPixmap *TEWidget::backgroundPixmap()
{
  static QPixmap *bg = new QPixmap("~/qpim/main/pics/faded_bg.xpm");
  const QPixmap *pm = bg;
  return pm;
}

void TEWidget::setColorTable(const ColorEntry table[])
{
  for (int i = 0; i < TABLE_COLORS; i++) color_table[i] = table[i];

  const QPixmap* pm = backgroundPixmap();
  if (!pm) setBackgroundColor(color_table[DEFAULT_BACK_COLOR].color);
  update();
}

//FIXME: add backgroundPixmapChanged.

/* ------------------------------------------------------------------------- */
/*                                                                           */
/*                                   Font                                    */
/*                                                                           */
/* ------------------------------------------------------------------------- */

/*
   The VT100 has 32 special graphical characters. The usual vt100 extended
   xterm fonts have these at 0x00..0x1f.

   QT's iso mapping leaves 0x00..0x7f without any changes. But the graphicals
   come in here as proper unicode characters.

   We treat non-iso10646 fonts as VT100 extended and do the requiered mapping
   from unicode to 0x00..0x1f. The remaining translation is then left to the
   QCodec.
*/

// assert for i in [0..31] : vt100extended(vt100_graphics[i]) == i.

unsigned short vt100_graphics[32] =
{ // 0/8     1/9    2/10    3/11    4/12    5/13    6/14    7/15
  0x0020, 0x25C6, 0x2592, 0x2409, 0x240c, 0x240d, 0x240a, 0x00b0,
  0x00b1, 0x2424, 0x240b, 0x2518, 0x2510, 0x250c, 0x2514, 0x253c,
  0xF800, 0xF801, 0x2500, 0xF803, 0xF804, 0x251c, 0x2524, 0x2534,
  0x252c, 0x2502, 0x2264, 0x2265, 0x03C0, 0x2260, 0x00A3, 0x00b7
};

static QChar vt100extended(QChar c)
{
  switch (c.unicode())
  {
    case 0x25c6 : return  1;
    case 0x2592 : return  2;
    case 0x2409 : return  3;
    case 0x240c : return  4;
    case 0x240d : return  5;
    case 0x240a : return  6;
    case 0x00b0 : return  7;
    case 0x00b1 : return  8;
    case 0x2424 : return  9;
    case 0x240b : return 10;
    case 0x2518 : return 11;
    case 0x2510 : return 12;
    case 0x250c : return 13;
    case 0x2514 : return 14;
    case 0x253c : return 15;
    case 0xf800 : return 16;
    case 0xf801 : return 17;
    case 0x2500 : return 18;
    case 0xf803 : return 19;
    case 0xf804 : return 20;
    case 0x251c : return 21;
    case 0x2524 : return 22;
    case 0x2534 : return 23;
    case 0x252c : return 24;
    case 0x2502 : return 25;
    case 0x2264 : return 26;
    case 0x2265 : return 27;
    case 0x03c0 : return 28;
    case 0x2260 : return 29;
    case 0x00a3 : return 30;
    case 0x00b7 : return 31;
  }
  return c;
}

static QChar identicalMap(QChar c)
{
  return c;
}

void TEWidget::fontChange(const QFont &)
{
  QFontMetrics fm(font());
  font_h = fm.height();
  //  font_w = fm.maxWidth();
  font_w = fm.width("m");
  font_a = fm.ascent();
  printf("font h=%d max_width=%d width_m=%d assent=%d\n", font_h,
         fm.maxWidth(), font_w, font_a);

  //printf("font_h: %d\n",font_h);
  //printf("font_w: %d\n",font_w);
  //printf("font_a: %d\n",font_a);
  //printf("charset: %s\n",QFont::encodingName(font().charSet()).ascii());
  //printf("rawname: %s\n",font().rawName().ascii());
  fontMap =
#if QT_VERSION < 0x030000
  strcmp(QFont::encodingName(font().charSet()).ascii(),"iso10646")
          ? vt100extended
          :
#endif
  identicalMap;
  propagateSize();
  update();
}

void TEWidget::setVTFont(const QFont& f)
{
  QFrame::setFont(f);
}

QFont TEWidget::getVTFont() {
  return font();
}

void TEWidget::setFont(const QFont &)
{
  // ignore font change request if not coming from konsole itself
}

/* ------------------------------------------------------------------------- */
/*                                                                           */
/*                         Constructor / Destructor                          */
/*                                                                           */
/* ------------------------------------------------------------------------- */

TEWidget::TEWidget(QWidget *parent, const char *name) : QFrame(parent,name)
{
#ifndef QT_NO_CLIPBOARD
  cb = QApplication::clipboard();
  QObject::connect( (QObject*)cb, SIGNAL(dataChanged()),
                    this, SLOT(onClearSelection()) );
#endif

  scrollbar = new QScrollBar(this);
  scrollbar->setCursor( arrowCursor );
  connect(scrollbar, SIGNAL(valueChanged(int)), this, SLOT(scrollChanged(int)));

  hScrollbar = new QScrollBar(this);
  hScrollbar->setCursor( arrowCursor );
  hScrollbar->setOrientation(QScrollBar::Horizontal);
  //  hScrollbar->setMaximumHeight(16);

  connect( hScrollbar, SIGNAL(valueChanged(int)), this, SLOT( hScrollChanged(int)));

  Config cfg( "Konsole" );
  cfg.setGroup("ScrollBar");
  switch( cfg.readNumEntry("Position",2)){
  case 0:
      scrollLoc = SCRNONE;
      break;
  case 1:
      scrollLoc = SCRLEFT;
      break;
  case 2:
      scrollLoc = SCRRIGHT;
      break;
  };

  useHorzScroll=cfg.readBoolEntry("HorzScroll",0);

  blinkT   = new QTimer(this);
  connect(blinkT, SIGNAL(timeout()), this, SLOT(blinkEvent()));
  // blinking = FALSE;
  blinking = TRUE;

  resizing = FALSE;
  actSel   = 0;
  image    = 0;
  lines    = 1;
  columns  = 1;
  font_w   = 1;
  font_h   = 1;
  font_a   = 1;
  word_selection_mode = FALSE;
  hposition = 0;
  vcolumns = 0;
  useBeep = true;

  setMouseMarks(TRUE);
  setVTFont( QFont("fixed") );
  setColorTable(base_color_table); // init color table

  qApp->installEventFilter( this ); //FIXME: see below
//  KCursor::setAutoHideCursor( this, true );

  // Init DnD ////////////////////////////////////////////////////////////////
  currentSession = NULL;
//  setAcceptDrops(true); // attempt
//  m_drop = new QPopupMenu(this);
//  m_drop->insertItem( QString("Paste"), 0);
//  m_drop->insertItem( QString("cd"),    1);
//  connect(m_drop, SIGNAL(activated(int)), SLOT(drop_menu_activated(int)));

  // we need focus so that the auto-hide cursor feature works
  setFocus();
  setFocusPolicy( WheelFocus );
}

//FIXME: make proper destructor
// Here's a start (David)
TEWidget::~TEWidget()
{
  qApp->removeEventFilter( this );
  if (image) free(image);
}

/* ------------------------------------------------------------------------- */
/*                                                                           */
/*                             Display Operations                            */
/*                                                                           */
/* ------------------------------------------------------------------------- */

void TEWidget::drawAttrStr(QPainter &paint, QRect rect,
                           QString& str, ca attr, BOOL pm, BOOL clear)
{
  if (pm && color_table[attr.b].transparent)
  {
    paint.setBackgroundMode( TransparentMode );
    if (clear) erase(rect);
  }
  else
  {
    if (blinking)
      paint.fillRect(rect, color_table[attr.b].color);
    else
    {
      paint.setBackgroundMode( OpaqueMode );
      paint.setBackgroundColor( color_table[attr.b].color );
    }
  }

  if (color_table[attr.f].bold)
    paint.setPen(QColor( 0x8F, 0x00, 0x00 ));
  else
    paint.setPen(color_table[attr.f].color);

  paint.drawText(rect.x(),rect.y()+font_a, str);

  if (attr.r & RE_UNDERLINE)
    paint.drawLine(rect.left(), rect.y()+font_a+1, rect.right(),rect.y()+font_a+1 );
}

void TEWidget::setImage(const ca* const newimg, int lines, int columns)
{ int y,x,len;
  const QPixmap* pm = backgroundPixmap();
  QPainter paint;
  setUpdatesEnabled(FALSE);
  paint.begin( this );
HCNT("setImage");

  QPoint tL  = contentsRect().topLeft();
  int    tLx = tL.x();
  int    tLy = tL.y();
  hasBlinker = FALSE;

  int cf  = -1; // undefined
  int cb  = -1; // undefined
  int cr  = -1; // undefined

  int lins = QMIN(this->lines,  QMAX(0,lines  ));
  int cols = QMIN(this->columns,QMAX(0,columns));
  QChar *disstrU = new QChar[cols];
  for (y = 0; y < lins; y++) {
    const ca*       lcl = &image[y*this->columns];
    const ca* const ext = &newimg[y*columns];
    if (!resizing) // not while resizing, we're expecting a paintEvent
    for (x = 0; x < cols; x++)
    {
      hasBlinker |= (ext[x].r & RE_BLINK);
      if (ext[x] != lcl[x])
      {
        cr = ext[x].r;
        cb = ext[x].b;
        if (ext[x].f != cf) cf = ext[x].f;
        int lln = cols - x;
        disstrU[0] = fontMap(ext[x+0].c);
        for (len = 1; len < lln; len++)
        {
          if (ext[x+len].f != cf || ext[x+len].b != cb || ext[x+len].r != cr ||
              ext[x+len] == lcl[x+len] )
            break;
          disstrU[len] = fontMap(ext[x+len].c);
        }
        QString unistr(disstrU,len);
        drawAttrStr(paint,
                    QRect(blX+tLx+font_w*x,bY+tLy+font_h*y,font_w*len,font_h),
                    unistr, ext[x], pm != NULL, true);
        x += len - 1;
      }
    }
    // finally, make `image' become `newimg'.
    memcpy((void*)lcl,(const void*)ext,cols*sizeof(ca));
  }
  drawFrame( &paint );
  paint.end();
  setUpdatesEnabled(TRUE);
  if ( hasBlinker && !blinkT->isActive()) blinkT->start(1000); // 1000 ms
  if (!hasBlinker &&  blinkT->isActive()) { blinkT->stop(); blinking = FALSE; }
  delete [] disstrU;
}

// paint Event ////////////////////////////////////////////////////

void TEWidget::paintEvent( QPaintEvent* pe )
{

//{ static int cnt = 0; printf("paint %d\n",cnt++); }
  const QPixmap* pm = backgroundPixmap();
  QPainter paint;
  setUpdatesEnabled(FALSE);
  paint.begin( this );
  paint.setBackgroundMode( TransparentMode );
HCNT("paintEvent");

  // Note that the actual widget size can be slightly larger
  // that the image (the size is truncated towards the smaller
  // number of characters in `resizeEvent'. The paint rectangle
  // can thus be larger than the image, but less then the size
  // of one character.

  QRect rect = pe->rect().intersect(contentsRect());

  QPoint tL  = contentsRect().topLeft();
  int    tLx = tL.x();
  int    tLy = tL.y();

  int lux = QMIN(columns-1, QMAX(0,(rect.left()   - tLx - blX ) / font_w));
  int luy = QMIN(lines-1,   QMAX(0,(rect.top()    - tLy - bY  ) / font_h));
  int rlx = QMIN(columns-1, QMAX(0,(rect.right()  - tLx - blX ) / font_w));
  int rly = QMIN(lines-1,   QMAX(0,(rect.bottom() - tLy - bY  ) / font_h));

  /*
 printf("paintEvent: %d..%d, %d..%d (%d..%d, %d..%d)\n",lux,rlx,luy,rly,
  rect.left(), rect.right(), rect.top(), rect.bottom());
  */

  //  if (pm != NULL && color_table[image->b].transparent)
  //  erase(rect);
  // BL: I have no idea why we need this, and it breaks the refresh.

  QChar *disstrU = new QChar[columns];
  for (int y = luy; y <= rly; y++)
  for (int x = lux; x <= rlx; x++)
  {
    int len = 1;
    disstrU[0] = fontMap(image[loc(x,y)].c);
    int cf = image[loc(x,y)].f;
    int cb = image[loc(x,y)].b;
    int cr = image[loc(x,y)].r;
    while (x+len <= rlx &&
           image[loc(x+len,y)].f == cf &&
           image[loc(x+len,y)].b == cb &&
           image[loc(x+len,y)].r == cr )
    {
      disstrU[len] = fontMap(image[loc(x+len,y)].c);
      len += 1;
    }
    QString unistr(disstrU,len);
    drawAttrStr(paint,
                QRect(blX+tLx+font_w*x,bY+tLy+font_h*y,font_w*len,font_h),
                unistr, image[loc(x,y)], pm != NULL, false);
    x += len - 1;
  }
  delete [] disstrU;
  drawFrame( &paint );
  paint.end();
  setUpdatesEnabled(TRUE);
}

void TEWidget::blinkEvent()
{
  blinking = !blinking;
  repaint(FALSE);
}

/* ------------------------------------------------------------------------- */
/*                                                                           */
/*                                  Resizing                                 */
/*                                                                           */
/* ------------------------------------------------------------------------- */

void TEWidget::resizeEvent(QResizeEvent* ev)
{
//  printf("resize: %d,%d\n",ev->size().width(),ev->size().height());
  //printf("approx: %d,%d\n",ev->size().width()/font_w,ev->size().height()/font_h);
  //printf("leaves: %d,%d\n",ev->size().width()%font_w,ev->size().height()%font_h);
  //printf("curren: %d,%d\n",width(),height());
HCNT("resizeEvent");

  // see comment in `paintEvent' concerning the rounding.
  //FIXME: could make a routine here; check width(),height()
  assert(ev->size().width() == width());
  assert(ev->size().height() == height());

  propagateSize();
}

void TEWidget::propagateSize()
{
  ca* oldimg = image;
  int oldlin = lines;
  int oldcol = columns;
  makeImage();
  // we copy the old image to reduce flicker
  int lins = QMIN(oldlin,lines);
  int cols = QMIN(oldcol,columns);
  if (oldimg)
  {
    for (int lin = 0; lin < lins; lin++)
      memcpy((void*)&image[columns*lin],
             (void*)&oldimg[oldcol*lin],cols*sizeof(ca));
    free(oldimg); //FIXME: try new,delete
  }
  else
    clearImage();

  //NOTE: control flows from the back through the chest right into the eye.
  //      `emu' will call back via `setImage'.

  resizing = TRUE;
  emit changedImageSizeSignal(lines, columns); // expose resizeEvent
  resizing = FALSE;
}

/* ------------------------------------------------------------------------- */
/*                                                                           */
/*                                Scrollbar                                  */
/*                                                                           */
/* ------------------------------------------------------------------------- */

void TEWidget::scrollChanged(int) {
  emit changedHistoryCursor(scrollbar->value()); //expose
}

void TEWidget::hScrollChanged(int loc) {
  hposition = loc;
  propagateSize();
  update();

//  emit changedHorzCursor( hScrollbar->value()); //expose
}

void TEWidget::setScroll(int cursor, int slines)
{
  disconnect(scrollbar, SIGNAL(valueChanged(int)), this, SLOT(scrollChanged(int)));
  scrollbar->setRange(0,slines);
  scrollbar->setSteps(1,lines);
  scrollbar->setValue(cursor);
  connect(scrollbar, SIGNAL(valueChanged(int)), this, SLOT(scrollChanged(int)));
}

void TEWidget::setScrollbarLocation(int loc)
{
  if (scrollLoc == loc) return; // quickly
  scrollLoc = loc;
  propagateSize();
  update();
}

/* ------------------------------------------------------------------------- */
/*                                                                           */
/*                                   Mouse                                   */
/*                                                                           */
/* ------------------------------------------------------------------------- */

void TEWidget::mousePressEvent(QMouseEvent* ev)
{
//printf("press [%d,%d] %d\n",ev->x()/font_w,ev->y()/font_h,ev->button());
  if ( !contentsRect().contains(ev->pos()) ) return;
  QPoint tL  = contentsRect().topLeft();
  int    tLx = tL.x();
  int    tLy = tL.y();

  mouse_down_x = ev->x();
  mouse_down_y = ev->y();

//printf("press top left [%d,%d] by=%d\n",tLx,tLy, bY);
  if ( ev->button() == LeftButton)
  {
    QPoint pos = QPoint((ev->x()-tLx-blX)/font_w,(ev->y()-tLy-bY)/font_h);

    word_selection_mode = (ev->state() & ShiftButton);

    if ( ev->state() & ControlButton ) preserve_line_breaks = FALSE ;

    if (mouse_marks || (ev->state() & ShiftButton))
    {
      emit clearSelectionSignal();
      iPntSel = pntSel = pos;
      actSel = 1; // left mouse button pressed but nothing selected yet.
      grabMouse(   /*crossCursor*/  ); // handle with care!
    }
    else
    {
      emit mouseSignal( 0, pos.x() + 1, pos.y() + 1 ); // left button
    }
  }
  if ( ev->button() == MidButton )
  {
    emitSelection();
  }
  if ( ev->button() == RightButton ) // Configure
  {
    emit configureRequest( this, ev->state()&(ShiftButton|ControlButton), ev->x(), ev->y() );
  }
}

void TEWidget::mouseMoveEvent(QMouseEvent* ev)
{
  // for auto-hiding the cursor, we need mouseTracking
  if (ev->state() == NoButton ) return;

  if (actSel == 0) return;

 // don't extend selection while pasting
  if (ev->state() & MidButton) return;

  //if ( !contentsRect().contains(ev->pos()) ) return;
  QPoint tL  = contentsRect().topLeft();
  int    tLx = tL.x();
  int    tLy = tL.y();
  int    scroll = scrollbar->value();
//  int    hScroll = hScrollbar->value();

  // we're in the process of moving the mouse with the left button pressed
  // the mouse cursor will kept catched within the bounds of the text in
  // this widget.

  // Adjust position within text area bounds. See FIXME above.
  QPoint pos = ev->pos();
  if ( pos.x() < tLx+blX )                  pos.setX( tLx+blX );
  if ( pos.x() > tLx+blX+columns*font_w-1 ) pos.setX( tLx+blX+columns*font_w );
  if ( pos.y() < tLy+bY )                   pos.setY( tLy+bY );
  if ( pos.y() > tLy+bY+lines*font_h-1 )    pos.setY( tLy+bY+lines*font_h-1 );
  // check if we produce a mouse move event by this
  if ( pos != ev->pos() ) cursor().setPos(mapToGlobal(pos));

  if ( pos.y() == tLy+bY+lines*font_h-1 )
  {
    scrollbar->setValue(scrollbar->value()+yMouseScroll); // scrollforward
  }
  if ( pos.y() == tLy+bY )
  {
    scrollbar->setValue(scrollbar->value()-yMouseScroll); // scrollback
  }

  QPoint here = QPoint((pos.x()-tLx-blX)/font_w,(pos.y()-tLy-bY)/font_h);
  QPoint ohere;
  bool swapping = FALSE;

  if ( word_selection_mode )
  {
    // Extend to word boundaries
    int i;
    int selClass;

    bool left_not_right = ( here.y() < iPntSel.y() ||
     here.y() == iPntSel.y() && here.x() < iPntSel.x() );
    bool old_left_not_right = ( pntSel.y() < iPntSel.y() ||
     pntSel.y() == iPntSel.y() && pntSel.x() < iPntSel.x() );
    swapping = left_not_right != old_left_not_right;

    // Find left (left_not_right ? from here : from start)
    QPoint left = left_not_right ? here : iPntSel;
    i = loc(left.x(),left.y());
    selClass = charClass(image[i].c);
    while ( left.x() > 0 && charClass(image[i-1].c) == selClass )
    { i--; left.rx()--; }

    // Find left (left_not_right ? from start : from here)
    QPoint right = left_not_right ? iPntSel : here;
    i = loc(right.x(),right.y());
    selClass = charClass(image[i].c);
    while ( right.x() < columns-1 && charClass(image[i+1].c) == selClass )
    { i++; right.rx()++; }

    // Pick which is start (ohere) and which is extension (here)
    if ( left_not_right )
    {
      here = left; ohere = right;
    }
    else
    {
      here = right; ohere = left;
    }
  }

  if (here == pntSel && scroll == scrollbar->value()) return; // not moved

  if ( word_selection_mode ) {
    if ( actSel < 2 || swapping ) {
      emit beginSelectionSignal( ohere.x(), ohere.y() );
    }
  } else if ( actSel < 2 ) {
    emit beginSelectionSignal( pntSel.x(), pntSel.y() );
  }

  actSel = 2; // within selection
  pntSel = here;
  emit extendSelectionSignal( here.x(), here.y() );
}

void TEWidget::mouseReleaseEvent(QMouseEvent* ev)
{
//printf("release [%d,%d] %d\n",ev->x()/font_w,ev->y()/font_h,ev->button());
  if ( ev->button() == LeftButton)
  {
    if (QABS(ev->x() - mouse_down_x) < 3
        && QABS(ev->y() - mouse_down_y) < 3
        && ev->y() < qApp->desktop()->height()/8) {
      emit setFullScreen(false);
    }

    if ( actSel > 1 ) emit endSelectionSignal(preserve_line_breaks);
    preserve_line_breaks = TRUE;
    actSel = 0;

    //FIXME: emits a release event even if the mouse is
    //       outside the range. The procedure used in `mouseMoveEvent'
    //       applies here, too.

    QPoint tL  = contentsRect().topLeft();
    int    tLx = tL.x();
    int    tLy = tL.y();

    if (!mouse_marks && !(ev->state() & ShiftButton))
      emit mouseSignal( 3, // release
                        (ev->x()-tLx-blX)/font_w + 1,
                        (ev->y()-tLy-bY)/font_h + 1 );
    releaseMouse();
  }
}

void TEWidget::mouseDoubleClickEvent(QMouseEvent* ev)
{
  if ( ev->button() != LeftButton) return;

  QPoint tL  = contentsRect().topLeft();
  int    tLx = tL.x();
  int    tLy = tL.y();
  QPoint pos = QPoint((ev->x()-tLx-blX)/font_w,(ev->y()-tLy-bY)/font_h);

  // pass on double click as two clicks.
  if (!mouse_marks && !(ev->state() & ShiftButton))
  {
    emit mouseSignal( 0, pos.x()+1, pos.y()+1 ); // left button
    emit mouseSignal( 3, pos.x()+1, pos.y()+1 ); // release
    emit mouseSignal( 0, pos.x()+1, pos.y()+1 ); // left button
    return;
  }


  emit clearSelectionSignal();
  QPoint bgnSel = pos;
  QPoint endSel = QPoint((ev->x()-tLx-blX)/font_w,(ev->y()-tLy-bY)/font_h);
  int i = loc(bgnSel.x(),bgnSel.y());
  iPntSel = bgnSel;

  word_selection_mode = TRUE;

  // find word boundaries...
  int selClass = charClass(image[i].c);
  {
    // set the start...
     int x = bgnSel.x();
     while ( x > 0 && charClass(image[i-1].c) == selClass )
     { i--; x--; }
     bgnSel.setX(x);
     emit beginSelectionSignal( bgnSel.x(), bgnSel.y() );

     // set the end...
     i = loc( endSel.x(), endSel.y() );
     x = endSel.x();
     while( x < columns-1 && charClass(image[i+1].c) == selClass )
     { i++; x++ ; }
     endSel.setX(x);
     actSel = 2; // within selection
     emit extendSelectionSignal( endSel.x(), endSel.y() );
     emit endSelectionSignal(preserve_line_breaks);
     preserve_line_breaks = TRUE;
   }
}

void TEWidget::focusInEvent( QFocusEvent * )
{

    // do nothing, to prevent repainting
}


void TEWidget::focusOutEvent( QFocusEvent * )
{
    // do nothing, to prevent repainting
}

bool TEWidget::focusNextPrevChild( bool next )
{
  if (next)
    return false; // This disables changing the active part in konqueror
                  // when pressing Tab
  return QFrame::focusNextPrevChild( next );
}


int TEWidget::charClass(char ch) const
{
    // This might seem like overkill, but imagine if ch was a Unicode
    // character (Qt 2.0 QChar) - it might then be sensible to separate
    // the different language ranges, etc.

    if ( isspace(ch) ) return ' ';

    static const char *word_characters = ":@-./_~";
    if ( isalnum(ch) || strchr(word_characters, ch) )
    return 'a';

    // Everything else is weird
    return 1;
}

void TEWidget::setMouseMarks(bool on)
{
  mouse_marks = on;
  setCursor( mouse_marks ? ibeamCursor : arrowCursor );
}

/* ------------------------------------------------------------------------- */
/*                                                                           */
/*                               Clipboard                                   */
/*                                                                           */
/* ------------------------------------------------------------------------- */

#undef KeyPress

void TEWidget::emitSelection()
// Paste Clipboard by simulating keypress events
{
#ifndef QT_NO_CLIPBOARD
  QString text = QApplication::clipboard()->text();
//      odebug << text << oendl; 
  if ( ! text.isNull())
  {
    text.replace(QRegExp("\n"), "\r");
    QKeyEvent e(QEvent::KeyPress, 0, -1, 0, text);
    emit keyPressedSignal(&e); // expose as a big fat keypress event
    emit clearSelectionSignal();
  }
#endif
}

void TEWidget::emitText(QString text)
{
  QKeyEvent e(QEvent::KeyPress, 0, -1, 0, text);
  emit keyPressedSignal(&e); // expose as a big fat keypress event
}

void TEWidget::pasteClipboard( )
{
  emitSelection();
}

void TEWidget::setSelection(const QString& t)
{
#ifndef QT_NO_CLIPBOARD
  // Disconnect signal while WE set the clipboard
  QObject *cb = QApplication::clipboard();
  QObject::disconnect( cb, SIGNAL(dataChanged()),
                     this, SLOT(onClearSelection()) );

  QApplication::clipboard()->setText(t);

  QObject::connect( cb, SIGNAL(dataChanged()),
                     this, SLOT(onClearSelection()) );
#endif
}

void TEWidget::onClearSelection()
{
  emit clearSelectionSignal();
}

/* ------------------------------------------------------------------------- */
/*                                                                           */
/*                                Keyboard                                   */
/*                                                                           */
/* ------------------------------------------------------------------------- */

//FIXME: an `eventFilter' has been installed instead of a `keyPressEvent'
//       due to a bug in `QT' or the ignorance of the author to prevent
//       repaint events being emitted to the screen whenever one leaves
//       or reenters the screen to/from another application.
//
//   Troll says one needs to change focusInEvent() and focusOutEvent(),
//   which would also let you have an in-focus cursor and an out-focus
//   cursor like xterm does.

// for the auto-hide cursor feature, I added empty focusInEvent() and
// focusOutEvent() so that update() isn't called.
// For auto-hide, we need to get keypress-events, but we only get them when
// we have focus.

void TEWidget::doScroll(int lines)
{
  scrollbar->setValue(scrollbar->value()+lines);
}

void TEWidget::doHScroll(int lines) {
  hScrollbar->setValue( hScrollbar->value()+lines);
}

bool TEWidget::eventFilter( QObject *obj, QEvent *e )
{
    if ( (e->type() == QEvent::Accel ||
          e->type() == QEvent::AccelAvailable ) && qApp->focusWidget() == this )  {
        static_cast<QKeyEvent *>( e )->ignore();
        return true;
    }
    if ( obj != this /* when embedded */ && obj != parent() /* when standalone */ )
        return FALSE; // not us
    if ( e->type() == QEvent::Wheel)  {
        QApplication::sendEvent(scrollbar, e);
    }

#ifdef FAKE_CTRL_AND_ALT
    static bool control = FALSE;
    static bool alt = FALSE;
//    odebug << " Has a keyboard with no CTRL and ALT keys, but we fake it:" << oendl; 
    bool dele=FALSE;
    if ( e->type() == QEvent::KeyPress || e->type() == QEvent::KeyRelease ) {
        QKeyEvent* ke = (QKeyEvent*)e;
        bool keydown = e->type() == QEvent::KeyPress || ke->isAutoRepeat();
        switch (ke->key()) {
          case Key_F9: // let this be "Control"
              control = keydown;
              e = new QKeyEvent(QEvent::KeyPress, Key_Control, 0, ke->state());
              dele=TRUE;
              break;
          case Key_F13: // let this be "Alt"
              alt = keydown;
              e = new QKeyEvent(QEvent::KeyPress, Key_Alt, 0, ke->state());
              dele=TRUE;
              break;
          default:
              if ( control ) {
                  int a = toupper(ke->ascii())-64;
                  if ( a >= 0 && a < ' ' ) {
                      e = new QKeyEvent(e->type(), ke->key(),
                                        a, ke->state()|ControlButton, QChar(a,0));
                      dele=TRUE;
                  }
              }
              if ( alt ) {
                  e = new QKeyEvent(e->type(), ke->key(),
                                    ke->ascii(), ke->state()|AltButton, ke->text());
                  dele=TRUE;
              }
        }
    }
#endif

    if ( e->type() == QEvent::KeyPress )  {
        QKeyEvent* ke = (QKeyEvent*)e;
        actSel=0; // Key stroke implies a screen update, so TEWidget won't
          // know where the current selection is.

//     odebug << "key pressed is 0x" << ke->key() << ", ascii is 0x" << ke->ascii() << ", state " << ke->state() << "" << oendl; 

        bool special_function = true;
        switch(ke->key()) {
          //    case 0x201b:  // fn-5
          //    case Key_F1:
          // switch sessions (?)
          // emitText("\\"); // expose  (??)
          //      break;

        case 0x2016:  // fn-p
        case Key_F2:
          pasteClipboard();
          break;

        case 0x2018:  // fn-S
        case Key_F3:
          emit changeSession(1);
          break;

        case 0x2019: // fn-n
          emit newSession();
          break;

        case Qt::Key_Tab:
          if (ke->state() == ControlButton) {
            emit changeSession(1);
          } else {
            special_function = false;
          }
          break;

#if 0
        case Qt::Key_Left:
          if (vcolumns == 0) {
            emit changeSession(-1);
          } else {
            special_function = false;
          }
          break;

        case Qt::Key_Right:
          if (vcolumns == 0) {
            emit changeSession(1);
          } else {
            special_function = false;
          }
          break;
#endif

        case 0x201b:  // fn-5
        case Key_F4:
          emit toggleFullScreen();
          break;

        case 0x200f:  // fn-1 magnify minus
        case Key_F5:
          emit changeFontSize(-1);
          break;

        case 0x2010:  // fn-2 magnify plus
        case Key_F6:
          emit changeFontSize(1);
          break;

        default:
          special_function = false;
        }
        if (special_function) {
          return true;
        }
        //        else if( ke->state() == ControlButton && ke->key() == Key_V) {
        //          pasteClipboard();
        //        }
        //        else if( ke->state() == ControlButton && ke->key() == Key_C) {
        //          pasteClipboard();
        //        }
        emit keyPressedSignal(ke); // expose
        ke->accept();
#ifdef FAKE_CTRL_AND_ALT
        if ( dele ) delete e;
#endif
        return true;               // stop the event
    }
    if ( e->type() == QEvent::Enter )  {
        QObject::disconnect( (QObject*)cb, SIGNAL(dataChanged()),
                             this, SLOT(onClearSelection()) );
    }
    if ( e->type() == QEvent::Leave )  {
        QObject::connect( (QObject*)cb, SIGNAL(dataChanged()),
                          this, SLOT(onClearSelection()) );
    }
    return QFrame::eventFilter( obj, e );
}

/* ------------------------------------------------------------------------- */
/*                                                                           */
/*                                  Frame                                    */
/*                                                                           */
/* ------------------------------------------------------------------------- */

void TEWidget::frameChanged()
{
  propagateSize();
  update();
}
/* ------------------------------------------------------------------------- */
/*                                                                           */
/*                                   Sound                                   */
/*                                                                           */
/* ------------------------------------------------------------------------- */

void TEWidget::Bell()
{
//#ifdef QT_QWS_SL5XXX
//# ifndef QT_NO_COP
    if(useBeep)
        QCopEnvelope( "QPE/TaskBar", "soundAlarm()" );

//# endif
//#else
//# ifndef QT_NO_SOUND
//    QSound::play(Resource::findSound("alarm"));
//# endif
//#endif

//    QApplication::beep();
}

/* ------------------------------------------------------------------------- */
/*                                                                           */
/*                                 Auxiluary                                 */
/*                                                                           */
/* ------------------------------------------------------------------------- */

void TEWidget::clearImage()
// initialize the image
// for internal use only
{
  for (int y = 0; y < lines; y++)
  for (int x = 0; x < columns; x++)
  {
    image[loc(x,y)].c = 0xff; //' ';
    image[loc(x,y)].f = 0xff; //DEFAULT_FORE_COLOR;
    image[loc(x,y)].b = 0xff; //DEFAULT_BACK_COLOR;
    image[loc(x,y)].r = 0xff; //DEFAULT_RENDITION;
  }
}

// Create Image ///////////////////////////////////////////////////////

void TEWidget::calcGeometry()
{
    int showhscrollbar = 1;
    int hwidth = 0;
    int dcolumns = 0;
    Config cfg( "Konsole" );
    cfg.setGroup("ScrollBar");
    useHorzScroll=cfg.readBoolEntry("HorzScroll",0);

    if(vcolumns == 0) showhscrollbar = 0;
    if(showhscrollbar == 1) hwidth = QApplication::style().scrollBarExtent().width();

    scrollbar->resize(QApplication::style().scrollBarExtent().width(),
                      contentsRect().height() - hwidth);

    switch(scrollLoc)  {
      case SCRNONE :
          columns = ( contentsRect().width() - 2 * rimX ) / font_w;
          dcolumns = columns;
          if(vcolumns) columns = vcolumns;
          blX = (contentsRect().width() - (columns*font_w) ) / 2;
          if(showhscrollbar)
              blX = -hposition * font_w;
          brX = blX;
          scrollbar->hide();
          break;
      case SCRLEFT :
          columns = ( contentsRect().width() - 2 * rimX - scrollbar->width()) / font_w;
          dcolumns = columns;
          if(vcolumns) columns = vcolumns;
          brX = (contentsRect().width() - (columns*font_w) - scrollbar->width() ) / 2;
          if(showhscrollbar)
              brX = -hposition * font_w;
          blX = brX + scrollbar->width();
          scrollbar->move(contentsRect().topLeft());
          scrollbar->show();
          break;
      case SCRRIGHT:
          columns = ( contentsRect().width()  - 2 * rimX - scrollbar->width()) / font_w;
          dcolumns = columns;
          if(vcolumns) columns = vcolumns;
          blX = (contentsRect().width() - (columns*font_w) - scrollbar->width() ) / 2;
          if(showhscrollbar)
              blX = -hposition * font_w;
          brX = blX;
          scrollbar->move(contentsRect().topRight() - QPoint(scrollbar->width()-1,0));
          scrollbar->show();
          break;
    }
      //FIXME: support 'rounding' styles
    lines   = ( contentsRect().height() - 2 * rimY  ) / font_h;
    bY = (contentsRect().height() - (lines  *font_h)) / 2;

    if(showhscrollbar == 1)  {
        hScrollbar->resize(contentsRect().width() - hwidth, hwidth);
        hScrollbar->setRange(0, vcolumns - dcolumns);

        QPoint p = contentsRect().bottomLeft();
        if(scrollLoc == SCRLEFT)
            hScrollbar->move(QPoint(p.x()+hwidth, p.y() - hwidth));
        else
            hScrollbar->move(QPoint(p.x(), p.y() - hwidth));

        hScrollbar->show();
    }
    else hScrollbar->hide();

    if(showhscrollbar == 1)  {
        lines = lines - (hwidth / font_h) - 1;
        if(lines < 1) lines = 1;
    }
  //FIXME: support 'rounding' styles
}

void TEWidget::makeImage()
//FIXME: rename 'calcGeometry?
{
  calcGeometry();
  image = (ca*) malloc(lines*columns*sizeof(ca));
  clearImage();
}

// calculate the needed size
QSize TEWidget::calcSize(int cols, int lins) const
{
  int frw = width() - contentsRect().width();
  int frh = height() - contentsRect().height();
  int scw = (scrollLoc==SCRNONE?0:scrollbar->width());
  return QSize( font_w*cols + 2*rimX + frw + scw, font_h*lins + 2*rimY + frh );
}

QSize TEWidget::sizeHint() const
{
   return size();
}

void TEWidget::styleChange(QStyle &)
{
    propagateSize();
}

#ifndef QT_NO_DRAGANDDROP

/* --------------------------------------------------------------------- */
/*                                                                       */
/* Drag & Drop                                                           */
/*                                                                       */
/* --------------------------------------------------------------------- */


void TEWidget::dragEnterEvent(QDragEnterEvent* e)
{
  e->accept(QTextDrag::canDecode(e) ||
      QUriDrag::canDecode(e));
}

void TEWidget::dropEvent(QDropEvent* event)
{
    // The current behaviour when url(s) are dropped is
    // * if there is only ONE url and if it's a LOCAL one, ask for paste or cd
    // * in all other cases, just paste
    //   (for non-local ones, or for a list of URLs, 'cd' is nonsense)
  QStrList strlist;
  int file_count = 0;
  dropText = "";
  bool bPopup = true;

  if(QUriDrag::decode(event, strlist)) {
    if (strlist.count()) {
      for(const char* p = strlist.first(); p; p = strlist.next()) {
        if(file_count++ > 0) {
          dropText += " ";
          bPopup = false; // more than one file, don't popup
        }

/*
        KURL url(p);
        if (url.isLocalFile()) {
          dropText += url.path(); // local URL : remove protocol
        }
        else {
          dropText += url.prettyURL();
          bPopup = false; // a non-local file, don't popup
        }
*/

      }

      if (bPopup)
        // m_drop->popup(pos() + event->pos());
  m_drop->popup(mapToGlobal(event->pos()));
      else
  {
    if (currentSession) {
      currentSession->getEmulation()->sendString(dropText.local8Bit());
    }
//    kdDebug() << "Drop:" << dropText.local8Bit() << "\n";
  }
    }
  }
  else if(QTextDrag::decode(event, dropText)) {
//    kdDebug() << "Drop:" << dropText.local8Bit() << "\n";
    if (currentSession) {
      currentSession->getEmulation()->sendString(dropText.local8Bit());
    }
    // Paste it
  }
}
#endif


void TEWidget::drop_menu_activated(int item)
{
#ifndef QT_NO_DRAGANDDROP
  switch (item)
  {
    case 0: // paste
      currentSession->getEmulation()->sendString(dropText.local8Bit());
//    KWM::activate((Window)this->winId());
      break;
    case 1: // cd ...
      currentSession->getEmulation()->sendString("cd ");
      struct stat statbuf;
      if ( ::stat( QFile::encodeName( dropText ), &statbuf ) == 0 )
      {
        if ( !S_ISDIR(statbuf.st_mode) )
        {
/*
          KURL url;
          url.setPath( dropText );
          dropText = url.directory( true, false ); // remove filename
*/
        }
      }
      dropText.replace(QRegExp(" "), "\\ "); // escape spaces
      currentSession->getEmulation()->sendString(dropText.local8Bit());
      currentSession->getEmulation()->sendString("\n");
//    KWM::activate((Window)this->winId());
      break;
  }
#else
  Q_UNUSED(item);  
#endif
}

void TEWidget::setWrapAt(int columns)
{
  vcolumns = columns;
  propagateSize();
  update();
}

---