kdbg/textvw.cpp

   1 // $Id$
   2
   3 // Copyright by Johannes Sixt
   4 // This file is under GPL, the GNU General Public Licence
   5
   6 #include <qpainter.h>
   7 #include <qkeycode.h>
   8 #include "textvw.h"
   9 #include "textvw.moc"
  10 #ifdef HAVE_CONFIG_H
  11 #include "config.h"
  12 #endif
  13 #include "mydebug.h"
  14
  15 #define DEFAULT_WIDTH 100
  16 #define DEFAULT_LINEHEIGHT 1
  17
  18 KTextView::KTextView(QWidget* parent, const char* name, WFlags f) :
  19         TableView(parent, name, f),
  20         m_width(DEFAULT_WIDTH),
  21         m_height(DEFAULT_LINEHEIGHT),
  22         m_tabWidth(0),
  23         m_curRow(-1)
  24 {
  25     setNumCols(1);
  26     setBackgroundColor(colorGroup().base());
  27 }
  28
  29 KTextView::~KTextView()
  30 {
  31 }
  32
  33 /*
  34  * Update cell width and hight; returns whether there is a change
  35  * Cell geometry: There are 2 pixels to the left and to the right
  36  * and 1 pixel _below_ the line
  37  */
  38 bool KTextView::updateCellSize(const QString& text)
  39 {
  40     QPainter p(this);
  41     setupPainter(&p);
  42     QRect r = p.boundingRect(0,0, 0,0,
  43                              AlignLeft | SingleLine | DontClip | ExpandTabs,
  44                              text, text.length());
  45
  46     bool update = false;
  47     int w = r.width() + 4;
  48     if (w > m_width) {
  49         m_width = w;
  50         update = true;
  51     }
  52     int h = r.height() + 1;
  53     if (h > m_height) {
  54         m_height = h;
  55         update = true;
  56     }
  57     return update;
  58 }
  59
  60 void KTextView::insertLine(const QString& text)
  61 {
  62     m_texts.push_back(text);
  63     setNumRows(m_texts.size());
  64
  65     updateCellSize(text);
  66
  67     if (autoUpdate()) {
  68         updateTableSize();
  69         repaint();
  70     }
  71 }
  72
  73 /*
  74  * TODO: This function doesn't shrink the line length if the longest line
  75  * is replaced by a shorter one.
  76  */
  77 void KTextView::replaceLine(int line, const QString& text)
  78 {
  79     if (line < 0 || line >= int(m_texts.size()))
  80         return;
  81
  82     m_texts[line] = text;
  83
  84     bool update = updateCellSize(text);
  85
  86     if (autoUpdate()) {
  87         if (update) {
  88             updateTableSize();
  89         }
  90         repaint();
  91     }
  92 }
  93
  94 void KTextView::setCursorPosition(int row, int)
  95 {
  96     activateLine(row);
  97 }
  98
  99 void KTextView::cursorPosition(int* row, int* col)
 100 {
 101     *row = m_curRow;
 102     *col = 0;
 103 }
 104
 105 int KTextView::cellWidth(int /*col*/) const
 106 {
 107     return m_width;
 108 }
 109
 110 int KTextView::cellHeight(int /*row*/) const
 111 {
 112     return m_height;
 113 }
 114
 115 int KTextView::textCol() const
 116 {
 117     // by default, the text is in column 0
 118     return 0;
 119 }
 120
 121 void KTextView::paintCell(QPainter* p, int row, int /*col*/)
 122 {
 123     if (row >= m_texts.size()) {
 124         return;
 125     }
 126     if (row == m_curRow) {
 127         // paint background
 128         p->fillRect(0,0, m_width,m_height, QBrush(colorGroup().background()));
 129     }
 130     const QString& text = m_texts[row];
 131     p->drawText(2,0, m_width-4, m_height,
 132                 AlignLeft | SingleLine | DontClip | ExpandTabs,
 133                 text, text.length());
 134 }
 135
 136 void KTextView::keyPressEvent(QKeyEvent* ev)
 137 {
 138     int oldRow = m_curRow;
 139
 140     // go to line 0 if no current line
 141     if (m_curRow < 0) {
 142         activateLine(0);
 143     }
 144     else
 145     {
 146         int numVisibleRows, newRow, newX;
 147
 148         switch (ev->key()) {
 149         case Key_Up:
 150             if (m_curRow > 0) {
 151                 activateLine(m_curRow-1);
 152             }
 153             break;
 154         case Key_Down:
 155             if (m_curRow < numRows()-1) {
 156                 activateLine(m_curRow+1);
 157             }
 158             break;
 159         case Key_PageUp:
 160             /* this method doesn't work for variable height lines */
 161             numVisibleRows = lastRowVisible()-topCell();
 162             newRow = m_curRow - QMAX(numVisibleRows,1);
 163             if (newRow < 0)
 164                 newRow = 0;
 165             activateLine(newRow);
 166             break;
 167         case Key_PageDown:
 168             /* this method doesn't work for variable height lines */
 169             numVisibleRows = lastRowVisible()-topCell();
 170             newRow = m_curRow + QMAX(numVisibleRows,1);
 171             if (newRow >= numRows())
 172                 newRow = numRows()-1;
 173             activateLine(newRow);
 174             break;
 175
 176         // scroll left and right by a few pixels
 177         case Key_Left:
 178             newX = xOffset() - viewWidth()/10;
 179             setXOffset(QMAX(newX, 0));
 180             break;
 181         case Key_Right:
 182             newX = xOffset() + viewWidth()/10;
 183             setXOffset(QMIN(newX, maxXOffset()));
 184             break;
 185
 186         default:
 187             QWidget::keyPressEvent(ev);
 188             return;
 189         }
 190     }
 191     // make row visible
 192     if (m_curRow != oldRow && !rowIsVisible(m_curRow)) {
 193         // if the old row was visible, we scroll the view by some pixels
 194         // if the old row was not visible, we place active row at the top
 195         if (oldRow >= 0 && rowIsVisible(oldRow)) {
 196             int diff = m_curRow - oldRow;
 197             int newTop = topCell() + diff;
 198             setTopCell(QMAX(newTop,0));
 199         } else {
 200             setTopCell(m_curRow);
 201         }
 202     }
 203     ev->accept();
 204 }
 205
 206 void KTextView::mousePressEvent(QMouseEvent* ev)
 207 {
 208     int row = findRow(ev->y());
 209     activateLine(row);
 210 }
 211
 212 void KTextView::focusInEvent(QFocusEvent*)
 213 {
 214     /*
 215      * The base class does a repaint(), which causes flicker. So we do
 216      * nothing here.
 217      */
 218 }
 219
 220 void KTextView::focusOutEvent(QFocusEvent*)
 221 {
 222     /*
 223      * The base class does a repaint(), which causes flicker. So we do
 224      * nothing here.
 225      */
 226 }
 227
 228 void KTextView::activateLine(int row)
 229 {
 230     if (row == m_curRow)
 231         return;
 232
 233     int col = textCol();
 234
 235     int oldRow = m_curRow;
 236     // note that row may be < 0
 237     m_curRow = row;
 238     // must change m_curRow first, so that updateCell(oldRow) erases the old line!
 239     if (oldRow >= 0) {
 240         updateCell(oldRow, col);
 241     }
 242     if (row >= 0) {
 243         updateCell(row, col);
 244     }
 245     emit lineChanged();
 246 }
 247
 248 /* This is needed to make the kcontrol's color setup working */
 249 void KTextView::paletteChange(const QPalette& oldPal)
 250 {
 251     setBackgroundColor(colorGroup().base());
 252     TableView::paletteChange(oldPal);
 253
 254     // recompute window size
 255     m_width = DEFAULT_WIDTH;
 256     m_height = DEFAULT_LINEHEIGHT;
 257     for (int i = 0; i < m_texts.size(); i++) {
 258         updateCellSize(m_texts[i]);
 259     }
 260     updateTableSize();
 261 }
 262
 263 void KTextView::setTabWidth(int numChars)
 264 {
 265     QFontMetrics fm = font();
 266     int newTabWidth = fm.width('x') * numChars;
 267     if (newTabWidth == m_tabWidth)
 268         return;
 269     m_tabWidth = newTabWidth;
 270
 271     // recompute window width
 272     m_width = DEFAULT_WIDTH;
 273     for (int i = 0; i < m_texts.size(); i++) {
 274         updateCellSize(m_texts[i]);
 275     }
 276
 277     updateTableSize();
 278     if (autoUpdate()) {
 279         repaint();
 280     }
 281 }
 282
 283 void KTextView::setupPainter(QPainter* p)
 284 {
 285     p->setTabStops(m_tabWidth);
 286 }
 287
 288 int KTextView::charAt(const QPoint& p, int* para)
 289 {
 290     if (findCol(p.x()) != textCol())
 291         return *para = -1;
 292     int row = findRow(p.y());
 293     *para = row;
 294     if (row < 0)
 295         return -1;
 296
 297     // find top-left corner of text cell
 298     int top, left;
 299     if (!colXPos(textCol(), &left))
 300         return -1;
 301     if (!rowYPos(row, &top))
 302         return -1;
 303
 304     // get the bounding rect of the text
 305     QPainter painter(this);
 306     setupPainter(&painter);
 307     const QString& text = m_texts[row];
 308     QRect bound =
 309         painter.boundingRect(left+2, top, 0,0,
 310                              AlignLeft | SingleLine | DontClip | ExpandTabs,
 311                              text, text.length());
 312     if (!bound.contains(p))
 313         return -1;                      /* p is outside text */
 314
 315     for (uint n = 0; n < text.length(); n++)
 316     {
 317         /*
 318          * If p is in the rectangle that has n+1 characters, than n
 319          * is the character we are looking for
 320          */
 321         bound =
 322             painter.boundingRect(left+2, top, 0,0,
 323                                  AlignLeft | SingleLine | DontClip | ExpandTabs,
 324                                  text, n+1);
 325         if (bound.contains(p))
 326             return n;
 327     }
 328     return -1;
 329 }