pv/views/decoder_output/QHexView.cpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2015 Victor Anjin <virinext@gmail.com>
   5  * Copyright (C) 2019 Soeren Apel <soeren@apelpie.net>
   6  *
   7  * The MIT License (MIT)
   8  *
   9  * Copyright (c) 2015
  10  *
  11  * Permission is hereby granted, free of charge, to any person obtaining a copy
  12  * of this software and associated documentation files (the "Software"), to deal
  13  * in the Software without restriction, including without limitation the rights
  14  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  15  * copies of the Software, and to permit persons to whom the Software is
  16  * furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice shall be included in all
  19  * copies or substantial portions of the Software.
  20  *
  21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  22  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  24  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  25  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  26  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  27  * SOFTWARE.
  28  */
  29
  30 #include <QApplication>
  31 #include <QClipboard>
  32 #include <QDebug>
  33 #include <QFont>
  34 #include <QKeyEvent>
  35 #include <QScrollBar>
  36 #include <QSize>
  37 #include <QPainter>
  38 #include <QPaintEvent>
  39
  40 #include "QHexView.hpp"
  41
  42 const unsigned int BYTES_PER_LINE   = 16;
  43 const unsigned int HEXCHARS_IN_LINE = BYTES_PER_LINE * 3 - 1;
  44 const unsigned int GAP_ADR_HEX      = 10;
  45 const unsigned int GAP_HEX_ASCII    = 10;
  46 const unsigned int GAP_ASCII_SLIDER = 5;
  47
  48
  49 QHexView::QHexView(QWidget *parent):
  50         QAbstractScrollArea(parent),
  51         mode_(ChunkedDataMode),
  52         data_(nullptr),
  53         selectBegin_(0),
  54         selectEnd_(0),
  55         cursorPos_(0)
  56 {
  57         setFont(QFont("Courier", 10));
  58
  59         charWidth_ = fontMetrics().boundingRect('X').width();
  60         charHeight_ = fontMetrics().height();
  61
  62         // Determine X coordinates of the three sub-areas
  63         posAddr_  = 0;
  64         posHex_   = 10 * charWidth_ + GAP_ADR_HEX;
  65         posAscii_ = posHex_ + HEXCHARS_IN_LINE * charWidth_ + GAP_HEX_ASCII;
  66
  67         setFocusPolicy(Qt::StrongFocus);
  68
  69         if (palette().color(QPalette::ButtonText).toHsv().value() > 127) {
  70                 // Color is bright
  71                 chunk_colors_.emplace_back(100, 149, 237); // QColorConstants::Svg::cornflowerblue
  72                 chunk_colors_.emplace_back(60, 179, 113);  // QColorConstants::Svg::mediumseagreen
  73                 chunk_colors_.emplace_back(210, 180, 140); // QColorConstants::Svg::tan
  74         } else {
  75                 // Color is dark
  76                 chunk_colors_.emplace_back(0, 0, 139);   // QColorConstants::Svg::darkblue
  77                 chunk_colors_.emplace_back(34, 139, 34); // QColorConstants::Svg::forestgreen
  78                 chunk_colors_.emplace_back(160, 82, 45); // QColorConstants::Svg::sienna
  79         }
  80 }
  81
  82 void QHexView::setMode(Mode m)
  83 {
  84         mode_ = m;
  85
  86         // This is not expected to be set when data is showing,
  87         // so we don't update the viewport here
  88 }
  89
  90 void QHexView::setData(const DecodeBinaryClass* data)
  91 {
  92         data_ = data;
  93
  94         size_t size = 0;
  95         size_t chunks = data_->chunks.size();
  96         for (size_t i = 0; i < chunks; i++)
  97                 size += data_->chunks[i].data.size();
  98         data_size_ = size;
  99
 100         viewport()->update();
 101 }
 102
 103 void QHexView::clear()
 104 {
 105         verticalScrollBar()->setValue(0);
 106         data_ = nullptr;
 107         data_size_ = 0;
 108
 109         viewport()->update();
 110 }
 111
 112 void QHexView::showFromOffset(size_t offset)
 113 {
 114         if (data_ && (offset < data_size_)) {
 115                 setCursorPos(offset * 2);
 116
 117                 int cursorY = cursorPos_ / (2 * BYTES_PER_LINE);
 118                 verticalScrollBar() -> setValue(cursorY);
 119         }
 120
 121         viewport()->update();
 122 }
 123
 124 QSizePolicy QHexView::sizePolicy() const
 125 {
 126         return QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding);
 127 }
 128
 129 pair<size_t, size_t> QHexView::get_selection() const
 130 {
 131         size_t start = selectBegin_ / 2;
 132         size_t end = selectEnd_ / 2;
 133
 134         if (start == end) {
 135                 // Nothing is currently selected
 136                 start = 0;
 137                 end = data_size_;
 138         } else
 139                 end++;
 140
 141         return std::make_pair(start, end);
 142 }
 143
 144 void QHexView::initialize_byte_iterator(size_t offset)
 145 {
 146         current_chunk_id_ = 0;
 147         current_chunk_offset_ = 0;
 148         current_offset_ = offset;
 149
 150         size_t chunks = data_->chunks.size();
 151         for (size_t i = 0; i < chunks; i++) {
 152                 size_t size = data_->chunks[i].data.size();
 153
 154                 if (offset >= size) {
 155                         current_chunk_id_++;
 156                         offset -= size;
 157                 } else {
 158                         current_chunk_offset_ = offset;
 159                         break;
 160                 }
 161         }
 162
 163         if (current_chunk_id_ < data_->chunks.size())
 164                 current_chunk_ = data_->chunks[current_chunk_id_];
 165 }
 166
 167 uint8_t QHexView::get_next_byte(bool* is_next_chunk)
 168 {
 169         if (is_next_chunk != nullptr)
 170                 *is_next_chunk = (current_chunk_offset_ == 0);
 171
 172         uint8_t v = 0;
 173         if (current_chunk_offset_ < current_chunk_.data.size())
 174                 v = current_chunk_.data[current_chunk_offset_];
 175
 176         current_offset_++;
 177         current_chunk_offset_++;
 178
 179         if (current_offset_ > data_size_) {
 180                 qWarning() << "QHexView::get_next_byte() overran binary data boundary:" <<
 181                         current_offset_ << "of" << data_size_ << "bytes";
 182                 return 0xEE;
 183         }
 184
 185         if ((current_chunk_offset_ == current_chunk_.data.size()) && (current_offset_ < data_size_)) {
 186                 current_chunk_id_++;
 187                 current_chunk_offset_ = 0;
 188                 current_chunk_ = data_->chunks[current_chunk_id_];
 189         }
 190
 191         return v;
 192 }
 193
 194 QSize QHexView::getFullSize() const
 195 {
 196         size_t width = posAscii_ + (BYTES_PER_LINE * charWidth_);
 197
 198         if (verticalScrollBar()->isEnabled())
 199                 width += GAP_ASCII_SLIDER + verticalScrollBar()->width();
 200
 201         if (!data_ || (data_size_ == 0))
 202                 return QSize(width, 0);
 203
 204         size_t height = data_size_ / BYTES_PER_LINE;
 205
 206         if (data_size_ % BYTES_PER_LINE)
 207                 height++;
 208
 209         height *= charHeight_;
 210
 211         return QSize(width, height);
 212 }
 213
 214 void QHexView::paintEvent(QPaintEvent *event)
 215 {
 216         QPainter painter(viewport());
 217
 218         // Calculate and update the widget and paint area sizes
 219         QSize widgetSize = getFullSize();
 220         setMinimumWidth(widgetSize.width());
 221         setMaximumWidth(widgetSize.width());
 222         QSize areaSize = viewport()->size();
 223
 224         // Only show scrollbar if the content goes beyond the visible area
 225         if (widgetSize.height() > areaSize.height()) {
 226                 verticalScrollBar()->setEnabled(true);
 227                 verticalScrollBar()->setPageStep(areaSize.height() / charHeight_);
 228                 verticalScrollBar()->setRange(0, ((widgetSize.height() - areaSize.height())) / charHeight_ + 1);
 229         } else
 230                 verticalScrollBar()->setEnabled(false);
 231
 232         // Fill widget background
 233         painter.fillRect(event->rect(), palette().color(QPalette::Base));
 234
 235         if (!data_ || (data_size_ == 0)) {
 236                 painter.setPen(palette().color(QPalette::Text));
 237                 QString s = tr("No data available");
 238                 int x = (areaSize.width() - fontMetrics().boundingRect(s).width()) / 2;
 239                 int y = areaSize.height() / 2;
 240                 painter.drawText(x, y, s);
 241                 return;
 242         }
 243
 244         // Determine first/last line indices
 245         size_t firstLineIdx = verticalScrollBar()->value();
 246
 247         size_t lastLineIdx = firstLineIdx + areaSize.height() / charHeight_;
 248         if (lastLineIdx > (data_size_ / BYTES_PER_LINE)) {
 249                 lastLineIdx = data_size_ / BYTES_PER_LINE;
 250                 if (data_size_ % BYTES_PER_LINE)
 251                         lastLineIdx++;
 252         }
 253
 254         // Fill address area background
 255         painter.fillRect(QRect(posAddr_, event->rect().top(),
 256                 posHex_ - (GAP_ADR_HEX / 2), height()), palette().color(QPalette::Window));
 257
 258         // Paint divider line between hex and ASCII areas
 259         int line_x = posAscii_ - (GAP_HEX_ASCII / 2);
 260         painter.setPen(palette().color(QPalette::Midlight));
 261         painter.drawLine(line_x, event->rect().top(), line_x, height());
 262
 263         // Paint address area
 264         painter.setPen(palette().color(QPalette::ButtonText));
 265
 266         int yStart = charHeight_;
 267         for (size_t lineIdx = firstLineIdx, y = yStart; lineIdx < lastLineIdx; lineIdx++) {
 268
 269                 QString address = QString("%1").arg(lineIdx * 16, 10, 16, QChar('0')).toUpper();
 270                 painter.drawText(posAddr_, y, address);
 271                 y += charHeight_;
 272         }
 273
 274         // Paint hex values
 275         QBrush regular = palette().buttonText();
 276         QBrush selected = palette().highlight();
 277
 278         bool multiple_chunks = (data_->chunks.size() > 1);
 279         unsigned int chunk_color = 0;
 280
 281         initialize_byte_iterator(firstLineIdx * BYTES_PER_LINE);
 282         yStart = charHeight_;
 283         for (size_t lineIdx = firstLineIdx, y = yStart; lineIdx < lastLineIdx; lineIdx++) {
 284
 285                 int x = posHex_;
 286                 for (size_t i = 0; (i < BYTES_PER_LINE) && (current_offset_ < data_size_); i++) {
 287                         size_t pos = (lineIdx * BYTES_PER_LINE + i) * 2;
 288
 289                         // Fetch byte
 290                         bool is_next_chunk;
 291                         uint8_t byte_value = get_next_byte(&is_next_chunk);
 292
 293                         if (is_next_chunk) {
 294                                 chunk_color++;
 295                                 if (chunk_color == chunk_colors_.size())
 296                                         chunk_color = 0;
 297                         }
 298
 299                         if ((pos >= selectBegin_) && (pos < selectEnd_)) {
 300                                 painter.setBackgroundMode(Qt::OpaqueMode);
 301                                 painter.setBackground(selected);
 302                                 painter.setPen(palette().color(QPalette::HighlightedText));
 303                         } else {
 304                                 painter.setBackground(regular);
 305                                 painter.setBackgroundMode(Qt::TransparentMode);
 306                                 if (!multiple_chunks)
 307                                         painter.setPen(palette().color(QPalette::Text));
 308                                 else
 309                                         painter.setPen(chunk_colors_[chunk_color]);
 310                         }
 311
 312                         // First nibble
 313                         QString val = QString::number((byte_value & 0xF0) >> 4, 16).toUpper();
 314                         painter.drawText(x, y, val);
 315
 316                         // Second nibble
 317                         val = QString::number((byte_value & 0xF), 16).toUpper();
 318                         painter.drawText(x + charWidth_, y, val);
 319
 320                         x += 3 * charWidth_;
 321                 }
 322
 323                 y += charHeight_;
 324         }
 325
 326         // Paint ASCII characters
 327         initialize_byte_iterator(firstLineIdx * BYTES_PER_LINE);
 328         yStart = charHeight_;
 329         for (size_t lineIdx = firstLineIdx, y = yStart; lineIdx < lastLineIdx; lineIdx++) {
 330
 331                 int x = posAscii_;
 332                 for (size_t i = 0; (i < BYTES_PER_LINE) && (current_offset_ < data_size_); i++) {
 333                         // Fetch byte
 334                         uint8_t ch = get_next_byte();
 335
 336                         if ((ch < 0x20) || (ch > 0x7E))
 337                                 ch = '.';
 338
 339                         size_t pos = (lineIdx * BYTES_PER_LINE + i) * 2;
 340                         if ((pos >= selectBegin_) && (pos < selectEnd_)) {
 341                                 painter.setBackgroundMode(Qt::OpaqueMode);
 342                                 painter.setBackground(selected);
 343                                 painter.setPen(palette().color(QPalette::HighlightedText));
 344                         } else {
 345                                 painter.setBackgroundMode(Qt::TransparentMode);
 346                                 painter.setBackground(regular);
 347                                 painter.setPen(palette().color(QPalette::Text));
 348                         }
 349
 350                         painter.drawText(x, y, QString(ch));
 351                         x += charWidth_;
 352                 }
 353
 354                 y += charHeight_;
 355         }
 356
 357         // Paint cursor
 358         if (hasFocus()) {
 359                 int x = (cursorPos_ % (2 * BYTES_PER_LINE));
 360                 int y = cursorPos_ / (2 * BYTES_PER_LINE);
 361                 y -= firstLineIdx;
 362                 int cursorX = (((x / 2) * 3) + (x % 2)) * charWidth_ + posHex_;
 363                 int cursorY = y * charHeight_ + 4;
 364                 painter.fillRect(cursorX, cursorY, 2, charHeight_, palette().color(QPalette::WindowText));
 365         }
 366 }
 367
 368 void QHexView::keyPressEvent(QKeyEvent *event)
 369 {
 370         bool setVisible = false;
 371
 372         // Cursor movements
 373         if (event->matches(QKeySequence::MoveToNextChar)) {
 374                 setCursorPos(cursorPos_ + 1);
 375                 resetSelection(cursorPos_);
 376                 setVisible = true;
 377         }
 378         if (event->matches(QKeySequence::MoveToPreviousChar)) {
 379                 setCursorPos(cursorPos_ - 1);
 380                 resetSelection(cursorPos_);
 381                 setVisible = true;
 382         }
 383
 384         if (event->matches(QKeySequence::MoveToEndOfLine)) {
 385                 setCursorPos(cursorPos_ | ((BYTES_PER_LINE * 2) - 1));
 386                 resetSelection(cursorPos_);
 387                 setVisible = true;
 388         }
 389         if (event->matches(QKeySequence::MoveToStartOfLine)) {
 390                 setCursorPos(cursorPos_ | (cursorPos_ % (BYTES_PER_LINE * 2)));
 391                 resetSelection(cursorPos_);
 392                 setVisible = true;
 393         }
 394         if (event->matches(QKeySequence::MoveToPreviousLine)) {
 395                 setCursorPos(cursorPos_ - BYTES_PER_LINE * 2);
 396                 resetSelection(cursorPos_);
 397                 setVisible = true;
 398         }
 399         if (event->matches(QKeySequence::MoveToNextLine)) {
 400                 setCursorPos(cursorPos_ + BYTES_PER_LINE * 2);
 401                 resetSelection(cursorPos_);
 402                 setVisible = true;
 403         }
 404
 405         if (event->matches(QKeySequence::MoveToNextPage)) {
 406                 setCursorPos(cursorPos_ + (viewport()->height() / charHeight_ - 1) * 2 * BYTES_PER_LINE);
 407                 resetSelection(cursorPos_);
 408                 setVisible = true;
 409         }
 410         if (event->matches(QKeySequence::MoveToPreviousPage)) {
 411                 setCursorPos(cursorPos_ - (viewport()->height() / charHeight_ - 1) * 2 * BYTES_PER_LINE);
 412                 resetSelection(cursorPos_);
 413                 setVisible = true;
 414         }
 415         if (event->matches(QKeySequence::MoveToEndOfDocument)) {
 416                 setCursorPos(data_size_ * 2);
 417                 resetSelection(cursorPos_);
 418                 setVisible = true;
 419         }
 420         if (event->matches(QKeySequence::MoveToStartOfDocument)) {
 421                 setCursorPos(0);
 422                 resetSelection(cursorPos_);
 423                 setVisible = true;
 424         }
 425
 426         // Select commands
 427         if (event->matches(QKeySequence::SelectAll)) {
 428                 resetSelection(0);
 429                 setSelection(2 * data_size_);
 430                 setVisible = true;
 431         }
 432         if (event->matches(QKeySequence::SelectNextChar)) {
 433                 int pos = cursorPos_ + 1;
 434                 setCursorPos(pos);
 435                 setSelection(pos);
 436                 setVisible = true;
 437         }
 438         if (event->matches(QKeySequence::SelectPreviousChar)) {
 439                 int pos = cursorPos_ - 1;
 440                 setSelection(pos);
 441                 setCursorPos(pos);
 442                 setVisible = true;
 443         }
 444         if (event->matches(QKeySequence::SelectEndOfLine)) {
 445                 int pos = cursorPos_ - (cursorPos_ % (2 * BYTES_PER_LINE)) + (2 * BYTES_PER_LINE);
 446                 setCursorPos(pos);
 447                 setSelection(pos);
 448                 setVisible = true;
 449         }
 450         if (event->matches(QKeySequence::SelectStartOfLine)) {
 451                 int pos = cursorPos_ - (cursorPos_ % (2 * BYTES_PER_LINE));
 452                 setCursorPos(pos);
 453                 setSelection(pos);
 454                 setVisible = true;
 455         }
 456         if (event->matches(QKeySequence::SelectPreviousLine)) {
 457                 int pos = cursorPos_ - (2 * BYTES_PER_LINE);
 458                 setCursorPos(pos);
 459                 setSelection(pos);
 460                 setVisible = true;
 461         }
 462         if (event->matches(QKeySequence::SelectNextLine)) {
 463                 int pos = cursorPos_ + (2 * BYTES_PER_LINE);
 464                 setCursorPos(pos);
 465                 setSelection(pos);
 466                 setVisible = true;
 467         }
 468
 469         if (event->matches(QKeySequence::SelectNextPage)) {
 470                 int pos = cursorPos_ + (((viewport()->height() / charHeight_) - 1) * 2 * BYTES_PER_LINE);
 471                 setCursorPos(pos);
 472                 setSelection(pos);
 473                 setVisible = true;
 474         }
 475         if (event->matches(QKeySequence::SelectPreviousPage)) {
 476                 int pos = cursorPos_ - (((viewport()->height() / charHeight_) - 1) * 2 * BYTES_PER_LINE);
 477                 setCursorPos(pos);
 478                 setSelection(pos);
 479                 setVisible = true;
 480         }
 481         if (event->matches(QKeySequence::SelectEndOfDocument)) {
 482                 int pos = data_size_ * 2;
 483                 setCursorPos(pos);
 484                 setSelection(pos);
 485                 setVisible = true;
 486         }
 487         if (event->matches(QKeySequence::SelectStartOfDocument)) {
 488                 setCursorPos(0);
 489                 setSelection(0);
 490                 setVisible = true;
 491         }
 492
 493         if (event->matches(QKeySequence::Copy) && (data_)) {
 494                 QString text;
 495
 496                 initialize_byte_iterator(selectBegin_ / 2);
 497
 498                 size_t selectedSize = (selectEnd_ - selectBegin_ + 1) / 2;
 499                 for (size_t i = 0; i < selectedSize; i++) {
 500                         uint8_t byte_value = get_next_byte();
 501
 502                         QString s = QString::number((byte_value & 0xF0) >> 4, 16).toUpper() +
 503                                 QString::number((byte_value & 0xF), 16).toUpper() + " ";
 504                         text += s;
 505
 506                         if (i % BYTES_PER_LINE == (BYTES_PER_LINE - 1))
 507                                 text += "\n";
 508                 }
 509
 510                 QClipboard *clipboard = QApplication::clipboard();
 511                 clipboard->setText(text, QClipboard::Clipboard);
 512                 if (clipboard->supportsSelection())
 513                         clipboard->setText(text, QClipboard::Selection);
 514         }
 515
 516         if (setVisible)
 517                 ensureVisible();
 518
 519         viewport()->update();
 520 }
 521
 522 void QHexView::mouseMoveEvent(QMouseEvent *event)
 523 {
 524         int actPos = cursorPosFromMousePos(event->pos());
 525         setCursorPos(actPos);
 526         setSelection(actPos);
 527
 528         viewport()->update();
 529 }
 530
 531 void QHexView::mousePressEvent(QMouseEvent *event)
 532 {
 533         int cPos = cursorPosFromMousePos(event->pos());
 534
 535         if ((QApplication::keyboardModifiers() & Qt::ShiftModifier) && (event->button() == Qt::LeftButton))
 536                 setSelection(cPos);
 537         else
 538                 resetSelection(cPos);
 539
 540         setCursorPos(cPos);
 541
 542         viewport()->update();
 543 }
 544
 545 size_t QHexView::cursorPosFromMousePos(const QPoint &position)
 546 {
 547         size_t pos = -1;
 548
 549         if (((size_t)position.x() >= posHex_) &&
 550                 ((size_t)position.x() < (posHex_ + HEXCHARS_IN_LINE * charWidth_))) {
 551
 552                 // Note: We add 1.5 character widths so that selection across
 553                 // byte gaps is smoother
 554                 size_t x = (position.x() + (1.5 * charWidth_ / 2) - posHex_) / charWidth_;
 555
 556                 // Note: We allow only full bytes to be selected, not nibbles,
 557                 // so we round to the nearest byte gap
 558                 x = (2 * x + 1) / 3;
 559
 560                 size_t firstLineIdx = verticalScrollBar()->value();
 561                 size_t y = (position.y() / charHeight_) * 2 * BYTES_PER_LINE;
 562                 pos = x + y + firstLineIdx * BYTES_PER_LINE * 2;
 563         }
 564
 565         size_t max_pos = data_size_ * 2;
 566
 567         return std::min(pos, max_pos);
 568 }
 569
 570 void QHexView::resetSelection()
 571 {
 572         selectBegin_ = selectInit_;
 573         selectEnd_ = selectInit_;
 574 }
 575
 576 void QHexView::resetSelection(int pos)
 577 {
 578         if (pos < 0)
 579                 pos = 0;
 580
 581         selectInit_ = pos;
 582         selectBegin_ = pos;
 583         selectEnd_ = pos;
 584 }
 585
 586 void QHexView::setSelection(int pos)
 587 {
 588         if (pos < 0)
 589                 pos = 0;
 590
 591         if ((size_t)pos >= selectInit_) {
 592                 selectEnd_ = pos;
 593                 selectBegin_ = selectInit_;
 594         } else {
 595                 selectBegin_ = pos;
 596                 selectEnd_ = selectInit_;
 597         }
 598 }
 599
 600 void QHexView::setCursorPos(int position)
 601 {
 602         if (position < 0)
 603                 position = 0;
 604
 605         int max_pos = data_size_ * 2;
 606
 607         if (position > max_pos)
 608                 position = max_pos;
 609
 610         cursorPos_ = position;
 611 }
 612
 613 void QHexView::ensureVisible()
 614 {
 615         QSize areaSize = viewport()->size();
 616
 617         int firstLineIdx = verticalScrollBar()->value();
 618         int lastLineIdx = firstLineIdx + areaSize.height() / charHeight_;
 619
 620         int cursorY = cursorPos_ / (2 * BYTES_PER_LINE);
 621
 622         if (cursorY < firstLineIdx)
 623                 verticalScrollBar()->setValue(cursorY);
 624         else
 625                 if(cursorY >= lastLineIdx)
 626                         verticalScrollBar()->setValue(cursorY - areaSize.height() / charHeight_ + 1);
 627 }