pv/views/decoder_binary/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 <limits>
  31
  32 #include <QApplication>
  33 #include <QClipboard>
  34 #include <QDebug>
  35 #include <QFont>
  36 #include <QKeyEvent>
  37 #include <QScrollBar>
  38 #include <QSize>
  39 #include <QString>
  40 #include <QPainter>
  41 #include <QPaintEvent>
  42
  43 #include "QHexView.hpp"
  44
  45 using std::make_pair;
  46
  47 const unsigned int BYTES_PER_LINE   = 16;
  48 const unsigned int HEXCHARS_IN_LINE = BYTES_PER_LINE * 3 - 1;
  49 const unsigned int GAP_ADR_HEX      = 10;
  50 const unsigned int GAP_HEX_ASCII    = 10;
  51 const unsigned int GAP_ASCII_SLIDER = 5;
  52
  53
  54 QHexView::QHexView(QWidget *parent):
  55         QAbstractScrollArea(parent),
  56         mode_(ChunkedDataMode),
  57         data_(nullptr),
  58         selectBegin_(0),
  59         selectEnd_(0),
  60         cursorPos_(0),
  61         visible_range_(0, 0),
  62         highlighted_sample_(std::numeric_limits<uint64_t>::max())
  63 {
  64         setFont(QFont("Courier", 10));
  65
  66         charWidth_ = fontMetrics().boundingRect('X').width();
  67         charHeight_ = fontMetrics().height();
  68
  69         setFocusPolicy(Qt::StrongFocus);
  70
  71         if (palette().color(QPalette::ButtonText).toHsv().value() > 127) {
  72                 // Color is bright
  73                 chunk_colors_.emplace_back(100, 149, 237); // QColorConstants::Svg::cornflowerblue
  74                 chunk_colors_.emplace_back(60, 179, 113);  // QColorConstants::Svg::mediumseagreen
  75                 chunk_colors_.emplace_back(210, 180, 140); // QColorConstants::Svg::tan
  76                 visible_range_color_ = QColor("#fff5ee");  // QColorConstants::Svg::seashell
  77         } else {
  78                 // Color is dark
  79                 chunk_colors_.emplace_back(0, 0, 139);    // QColorConstants::Svg::darkblue
  80                 chunk_colors_.emplace_back(34, 139, 34);  // QColorConstants::Svg::forestgreen
  81                 chunk_colors_.emplace_back(160, 82, 45);  // QColorConstants::Svg::sienna
  82                 visible_range_color_ = QColor("#fff5ee"); // QColorConstants::Svg::seashell
  83         }
  84 }
  85
  86 void QHexView::set_mode(Mode m)
  87 {
  88         mode_ = m;
  89
  90         // This is not expected to be set when data is showing,
  91         // so we don't update the viewport here
  92 }
  93
  94 void QHexView::set_data(const DecodeBinaryClass* data)
  95 {
  96         data_ = data;
  97
  98         size_t size = 0;
  99         if (data) {
 100                 size_t chunks = data_->chunks.size();
 101                 for (size_t i = 0; i < chunks; i++)
 102                         size += data_->chunks[i].data.size();
 103         }
 104         data_size_ = size;
 105
 106         address_digits_ = (uint8_t)QString::number(data_size_, 16).length();
 107
 108         // Calculate X coordinates of the three sub-areas
 109         posAddr_  = 0;
 110         posHex_   = address_digits_ * charWidth_ + GAP_ADR_HEX;
 111         posAscii_ = posHex_ + HEXCHARS_IN_LINE * charWidth_ + GAP_HEX_ASCII;
 112
 113         viewport()->update();
 114 }
 115
 116 void QHexView::set_visible_sample_range(uint64_t start, uint64_t end)
 117 {
 118         visible_range_ = make_pair(start, end);
 119
 120         viewport()->update();
 121 }
 122
 123 void QHexView::set_highlighted_data_sample(uint64_t sample)
 124 {
 125         highlighted_sample_ = sample;
 126
 127         viewport()->update();
 128 }
 129
 130 unsigned int QHexView::get_bytes_per_line() const
 131 {
 132         return BYTES_PER_LINE;
 133 }
 134
 135 void QHexView::clear()
 136 {
 137         verticalScrollBar()->setValue(0);
 138         data_ = nullptr;
 139         data_size_ = 0;
 140
 141         highlighted_sample_ = std::numeric_limits<uint64_t>::max();
 142
 143         viewport()->update();
 144 }
 145
 146 void QHexView::showFromOffset(size_t offset)
 147 {
 148         if (data_ && (offset < data_size_)) {
 149                 setCursorPos(offset * 2);
 150
 151                 int cursorY = cursorPos_ / (2 * BYTES_PER_LINE);
 152                 verticalScrollBar() -> setValue(cursorY);
 153         }
 154
 155         viewport()->update();
 156 }
 157
 158 QSizePolicy QHexView::sizePolicy() const
 159 {
 160         return QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding);
 161 }
 162
 163 pair<size_t, size_t> QHexView::get_selection() const
 164 {
 165         size_t start = selectBegin_ / 2;
 166         size_t end = selectEnd_ / 2;
 167
 168         if (start == end) {
 169                 // Nothing is currently selected
 170                 start = 0;
 171                 end = data_size_;
 172         } if (end < data_size_)
 173                 end++;
 174
 175         return std::make_pair(start, end);
 176 }
 177
 178 size_t QHexView::create_hex_line(size_t start, size_t end, QString* dest,
 179         bool with_offset, bool with_ascii)
 180 {
 181         dest->clear();
 182
 183         // Determine start address for the row
 184         uint64_t row = start / BYTES_PER_LINE;
 185         uint64_t offset = row * BYTES_PER_LINE;
 186         end = std::min((uint64_t)end, offset + BYTES_PER_LINE);
 187
 188         if (with_offset)
 189                 dest->append(QString("%1 ").arg(row * BYTES_PER_LINE, address_digits_, 16, QChar('0')).toUpper());
 190
 191         initialize_byte_iterator(offset);
 192         for (size_t i = offset; i < offset + BYTES_PER_LINE; i++) {
 193                 uint8_t value = 0;
 194
 195                 if (i < end)
 196                         value = get_next_byte();
 197
 198                 if ((i < start) || (i >= end))
 199                         dest->append("   ");
 200                 else
 201                         dest->append(QString("%1 ").arg(value, 2, 16, QChar('0')).toUpper());
 202         }
 203
 204         if (with_ascii) {
 205                 initialize_byte_iterator(offset);
 206                 for (size_t i = offset; i < end; i++) {
 207                         uint8_t value = get_next_byte();
 208
 209                         if ((value < 0x20) || (value > 0x7E))
 210                                 value = '.';
 211
 212                         if (i < start)
 213                                 dest->append(' ');
 214                         else
 215                                 dest->append((char)value);
 216                 }
 217         }
 218
 219         return end;
 220 }
 221
 222 void QHexView::initialize_byte_iterator(size_t offset)
 223 {
 224         current_chunk_id_ = 0;
 225         current_chunk_offset_ = 0;
 226         current_offset_ = offset;
 227
 228         size_t chunks = data_->chunks.size();
 229         for (size_t i = 0; i < chunks; i++) {
 230                 size_t size = data_->chunks[i].data.size();
 231
 232                 if (offset >= size) {
 233                         current_chunk_id_++;
 234                         offset -= size;
 235                 } else {
 236                         current_chunk_offset_ = offset;
 237                         break;
 238                 }
 239         }
 240
 241         if (current_chunk_id_ < data_->chunks.size())
 242                 current_chunk_ = data_->chunks[current_chunk_id_];
 243
 244         current_chunk_sample_ = current_chunk_.sample;
 245
 246         // Obtain sample of next chunk if there is one
 247         if ((current_chunk_id_ + 1) < data_->chunks.size())
 248                 next_chunk_sample_ = data_->chunks[current_chunk_id_ + 1].sample;
 249         else
 250                 next_chunk_sample_ = std::numeric_limits<uint64_t>::max();
 251 }
 252
 253 uint8_t QHexView::get_next_byte(bool* is_new_chunk)
 254 {
 255         if (is_new_chunk != nullptr)
 256                 *is_new_chunk = (current_chunk_offset_ == 0);
 257
 258         uint8_t v = 0;
 259         if (current_chunk_offset_ < current_chunk_.data.size())
 260                 v = current_chunk_.data[current_chunk_offset_];
 261
 262         current_chunk_sample_ = current_chunk_.sample;
 263
 264         if (is_new_chunk) {
 265                 // Obtain sample of next chunk if there is one
 266                 if ((current_chunk_id_ + 1) < data_->chunks.size())
 267                         next_chunk_sample_ = data_->chunks[current_chunk_id_ + 1].sample;
 268                 else
 269                         next_chunk_sample_ = std::numeric_limits<uint64_t>::max();
 270         }
 271
 272         current_offset_++;
 273         current_chunk_offset_++;
 274
 275         if (current_offset_ > data_size_) {
 276                 qWarning() << "QHexView::get_next_byte() overran binary data boundary:" <<
 277                         current_offset_ << "of" << data_size_ << "bytes";
 278                 return 0xEE;
 279         }
 280
 281         if ((current_chunk_offset_ == current_chunk_.data.size()) && (current_offset_ < data_size_)) {
 282                 current_chunk_id_++;
 283                 current_chunk_offset_ = 0;
 284                 current_chunk_ = data_->chunks[current_chunk_id_];
 285         }
 286
 287         return v;
 288 }
 289
 290 QSize QHexView::getFullSize() const
 291 {
 292         size_t width = posAscii_ + (BYTES_PER_LINE * charWidth_);
 293
 294         if (verticalScrollBar()->isEnabled())
 295                 width += GAP_ASCII_SLIDER + verticalScrollBar()->width();
 296
 297         if (!data_ || (data_size_ == 0))
 298                 return QSize(width, 0);
 299
 300         size_t height = data_size_ / BYTES_PER_LINE;
 301
 302         if (data_size_ % BYTES_PER_LINE)
 303                 height++;
 304
 305         height *= charHeight_;
 306
 307         return QSize(width, height);
 308 }
 309
 310 void QHexView::paintEvent(QPaintEvent *event)
 311 {
 312         QPainter painter(viewport());
 313
 314         QFont normal_font = painter.font();
 315         QFont bold_font = painter.font();
 316         bold_font.setWeight(QFont::Bold);
 317
 318         bool bold_font_was_used = false;
 319
 320         // Calculate and update the widget and paint area sizes
 321         QSize widgetSize = getFullSize();
 322         setMinimumWidth(widgetSize.width());
 323         setMaximumWidth(widgetSize.width());
 324         QSize areaSize = viewport()->size() - QSize(0, charHeight_);
 325
 326         // Only show scrollbar if the content goes beyond the visible area
 327         if (widgetSize.height() > areaSize.height()) {
 328                 verticalScrollBar()->setEnabled(true);
 329                 verticalScrollBar()->setPageStep(areaSize.height() / charHeight_);
 330                 verticalScrollBar()->setRange(0, ((widgetSize.height() - areaSize.height())) / charHeight_ + 1);
 331         } else
 332                 verticalScrollBar()->setEnabled(false);
 333
 334         // Fill widget background
 335         painter.fillRect(event->rect(), palette().color(QPalette::Base));
 336
 337         if (!data_ || (data_size_ == 0) || (data_->chunks.empty())) {
 338                 painter.setPen(palette().color(QPalette::Text));
 339                 QString s = tr("No data available");
 340                 int x = (areaSize.width() - fontMetrics().boundingRect(s).width()) / 2;
 341                 int y = areaSize.height() / 2;
 342                 painter.drawText(x, y, s);
 343                 return;
 344         }
 345
 346         // Determine first/last line indices
 347         size_t firstLineIdx = verticalScrollBar()->value();
 348
 349         size_t lastLineIdx = firstLineIdx + (areaSize.height() / charHeight_);
 350         if (lastLineIdx > (data_size_ / BYTES_PER_LINE)) {
 351                 lastLineIdx = data_size_ / BYTES_PER_LINE;
 352                 if (data_size_ % BYTES_PER_LINE)
 353                         lastLineIdx++;
 354         }
 355
 356         // Paint divider line between hex and ASCII areas
 357         int line_x = posAscii_ - (GAP_HEX_ASCII / 2);
 358         painter.setPen(palette().color(QPalette::Midlight));
 359         painter.drawLine(line_x, event->rect().top(), line_x, height());
 360
 361         // Fill address area background
 362         painter.fillRect(QRect(posAddr_, event->rect().top(),
 363                 posHex_ - (GAP_ADR_HEX / 2), height()), palette().color(QPalette::Window));
 364         painter.fillRect(QRect(posAddr_, event->rect().top(),
 365                 posAscii_ - (GAP_HEX_ASCII / 2), charHeight_ + 2), palette().color(QPalette::Window));
 366
 367         // Paint address area
 368         painter.setPen(palette().color(QPalette::ButtonText));
 369
 370         int yStart = 2 * charHeight_;
 371         for (size_t lineIdx = firstLineIdx, y = yStart; lineIdx < lastLineIdx; lineIdx++) {
 372
 373                 QString address = QString("%1").arg(lineIdx * 16, address_digits_, 16, QChar('0')).toUpper();
 374                 painter.drawText(posAddr_, y, address);
 375                 y += charHeight_;
 376         }
 377
 378         // Paint top row with hex offsets
 379         painter.setPen(palette().color(QPalette::ButtonText));
 380         for (int offset = 0; offset <= 0xF; offset++)
 381                 painter.drawText(posHex_ + (1 + offset * 3) * charWidth_,
 382                         charHeight_ - 3, QString::number(offset, 16).toUpper());
 383
 384         // Paint hex values
 385         QBrush regular_brush = palette().buttonText();
 386         QBrush selected_brush = palette().highlight();
 387         QBrush visible_range_brush = QBrush(visible_range_color_);
 388
 389         bool multiple_chunks = (data_->chunks.size() > 1);
 390         unsigned int chunk_color = 0;
 391
 392         initialize_byte_iterator(firstLineIdx * BYTES_PER_LINE);
 393
 394         yStart = 2 * charHeight_;
 395         for (size_t lineIdx = firstLineIdx, y = yStart; lineIdx < lastLineIdx; lineIdx++) {
 396
 397                 int x = posHex_;
 398                 for (size_t i = 0; (i < BYTES_PER_LINE) && (current_offset_ < data_size_); i++) {
 399                         size_t pos = (lineIdx * BYTES_PER_LINE + i) * 2;
 400
 401                         // Fetch byte
 402                         bool is_new_chunk;
 403                         uint8_t byte_value = get_next_byte(&is_new_chunk);
 404
 405                         if (is_new_chunk) {
 406                                 chunk_color++;
 407                                 if (chunk_color == chunk_colors_.size())
 408                                         chunk_color = 0;
 409
 410                                 // New chunk means also new chunk sample, so check for required changes
 411                                 if (bold_font_was_used)
 412                                         painter.setFont(normal_font);
 413                                 if ((highlighted_sample_ >= current_chunk_sample_) && (highlighted_sample_ < next_chunk_sample_)) {
 414                                         painter.setFont(bold_font);
 415                                         bold_font_was_used = true;
 416                                 }
 417                         }
 418
 419                         // Restore default paint style
 420                         painter.setBackground(regular_brush);
 421                         painter.setBackgroundMode(Qt::TransparentMode);
 422                         if (!multiple_chunks)
 423                                 painter.setPen(palette().color(QPalette::Text));
 424                         else
 425                                 painter.setPen(chunk_colors_[chunk_color]);
 426
 427                         // Highlight needed because it's the range visible in main view?
 428                         if ((current_chunk_sample_ >= visible_range_.first) && (current_chunk_sample_ < visible_range_.second)) {
 429                                 painter.setBackgroundMode(Qt::OpaqueMode);
 430                                 painter.setBackground(visible_range_brush);
 431                         }
 432
 433                         // Highlight for selection range needed? (takes priority over visible range highlight)
 434                         if ((pos >= selectBegin_) && (pos < selectEnd_)) {
 435                                 painter.setBackgroundMode(Qt::OpaqueMode);
 436                                 painter.setBackground(selected_brush);
 437                                 painter.setPen(palette().color(QPalette::HighlightedText));
 438                         }
 439
 440                         // First nibble
 441                         QString val = QString::number((byte_value & 0xF0) >> 4, 16).toUpper();
 442                         painter.drawText(x, y, val);
 443
 444                         // Second nibble
 445                         val = QString::number((byte_value & 0xF), 16).toUpper();
 446                         painter.drawText(x + charWidth_, y, val);
 447
 448                         if ((i < BYTES_PER_LINE - 1) && (current_offset_ < data_size_))
 449                                 painter.drawText(x + 2 * charWidth_, y, QString(' '));
 450
 451                         x += 3 * charWidth_;
 452                 }
 453
 454                 y += charHeight_;
 455         }
 456
 457         // Paint ASCII characters
 458         initialize_byte_iterator(firstLineIdx * BYTES_PER_LINE);
 459         yStart = 2 * charHeight_;
 460         for (size_t lineIdx = firstLineIdx, y = yStart; lineIdx < lastLineIdx; lineIdx++) {
 461
 462                 int x = posAscii_;
 463                 for (size_t i = 0; (i < BYTES_PER_LINE) && (current_offset_ < data_size_); i++) {
 464                         // Fetch byte
 465                         bool is_new_chunk;
 466                         uint8_t ch = get_next_byte(&is_new_chunk);
 467
 468                         if (is_new_chunk) {
 469                                 // New chunk means also new chunk sample, so check for required changes
 470                                 if (bold_font_was_used)
 471                                         painter.setFont(normal_font);
 472                                 if ((highlighted_sample_ >= current_chunk_sample_) && (highlighted_sample_ < next_chunk_sample_)) {
 473                                         painter.setFont(bold_font);
 474                                         bold_font_was_used = true;
 475                                 }
 476                         }
 477
 478                         if ((ch < 0x20) || (ch > 0x7E))
 479                                 ch = '.';
 480
 481                         // Restore default paint style
 482                         painter.setBackgroundMode(Qt::TransparentMode);
 483                         painter.setBackground(regular_brush);
 484                         painter.setPen(palette().color(QPalette::Text));
 485
 486                         // Highlight needed because it's the range visible in main view?
 487                         if ((current_chunk_sample_ >= visible_range_.first) && (current_chunk_sample_ < visible_range_.second)) {
 488                                 painter.setBackgroundMode(Qt::OpaqueMode);
 489                                 painter.setBackground(visible_range_brush);
 490                         }
 491
 492                         // Highlight for selection range needed? (takes priority over visible range highlight)
 493                         size_t pos = (lineIdx * BYTES_PER_LINE + i) * 2;
 494                         if ((pos >= selectBegin_) && (pos < selectEnd_)) {
 495                                 painter.setBackgroundMode(Qt::OpaqueMode);
 496                                 painter.setBackground(selected_brush);
 497                                 painter.setPen(palette().color(QPalette::HighlightedText));
 498                         }
 499
 500                         painter.drawText(x, y, QString(ch));
 501                         x += charWidth_;
 502                 }
 503
 504                 y += charHeight_;
 505         }
 506
 507         // Restore painter defaults
 508         painter.setBackgroundMode(Qt::TransparentMode);
 509         painter.setBackground(regular_brush);
 510
 511         // Paint cursor
 512         if (hasFocus()) {
 513                 int x = (cursorPos_ % (2 * BYTES_PER_LINE));
 514                 int y = cursorPos_ / (2 * BYTES_PER_LINE);
 515                 y -= firstLineIdx;
 516                 int cursorX = (((x / 2) * 3) + (x % 2)) * charWidth_ + posHex_;
 517                 int cursorY = charHeight_ + y * charHeight_ + 4;
 518                 painter.fillRect(cursorX, cursorY, 2, charHeight_, palette().color(QPalette::WindowText));
 519         }
 520 }
 521
 522 void QHexView::keyPressEvent(QKeyEvent *event)
 523 {
 524         bool setVisible = false;
 525
 526         // Cursor movements
 527         if (event->matches(QKeySequence::MoveToNextChar)) {
 528                 setCursorPos(cursorPos_ + 1);
 529                 resetSelection(cursorPos_);
 530                 setVisible = true;
 531         }
 532         if (event->matches(QKeySequence::MoveToPreviousChar)) {
 533                 setCursorPos(cursorPos_ - 1);
 534                 resetSelection(cursorPos_);
 535                 setVisible = true;
 536         }
 537
 538         if (event->matches(QKeySequence::MoveToEndOfLine)) {
 539                 setCursorPos(cursorPos_ | ((BYTES_PER_LINE * 2) - 1));
 540                 resetSelection(cursorPos_);
 541                 setVisible = true;
 542         }
 543         if (event->matches(QKeySequence::MoveToStartOfLine)) {
 544                 setCursorPos(cursorPos_ | (cursorPos_ % (BYTES_PER_LINE * 2)));
 545                 resetSelection(cursorPos_);
 546                 setVisible = true;
 547         }
 548         if (event->matches(QKeySequence::MoveToPreviousLine)) {
 549                 setCursorPos(cursorPos_ - BYTES_PER_LINE * 2);
 550                 resetSelection(cursorPos_);
 551                 setVisible = true;
 552         }
 553         if (event->matches(QKeySequence::MoveToNextLine)) {
 554                 setCursorPos(cursorPos_ + BYTES_PER_LINE * 2);
 555                 resetSelection(cursorPos_);
 556                 setVisible = true;
 557         }
 558
 559         if (event->matches(QKeySequence::MoveToNextPage)) {
 560                 setCursorPos(cursorPos_ + (viewport()->height() / charHeight_ - 1) * 2 * BYTES_PER_LINE);
 561                 resetSelection(cursorPos_);
 562                 setVisible = true;
 563         }
 564         if (event->matches(QKeySequence::MoveToPreviousPage)) {
 565                 setCursorPos(cursorPos_ - (viewport()->height() / charHeight_ - 1) * 2 * BYTES_PER_LINE);
 566                 resetSelection(cursorPos_);
 567                 setVisible = true;
 568         }
 569         if (event->matches(QKeySequence::MoveToEndOfDocument)) {
 570                 setCursorPos(data_size_ * 2);
 571                 resetSelection(cursorPos_);
 572                 setVisible = true;
 573         }
 574         if (event->matches(QKeySequence::MoveToStartOfDocument)) {
 575                 setCursorPos(0);
 576                 resetSelection(cursorPos_);
 577                 setVisible = true;
 578         }
 579
 580         // Select commands
 581         if (event->matches(QKeySequence::SelectAll)) {
 582                 resetSelection(0);
 583                 setSelection(2 * data_size_);
 584                 setVisible = true;
 585         }
 586         if (event->matches(QKeySequence::SelectNextChar)) {
 587                 int pos = cursorPos_ + 1;
 588                 setCursorPos(pos);
 589                 setSelection(pos);
 590                 setVisible = true;
 591         }
 592         if (event->matches(QKeySequence::SelectPreviousChar)) {
 593                 int pos = cursorPos_ - 1;
 594                 setSelection(pos);
 595                 setCursorPos(pos);
 596                 setVisible = true;
 597         }
 598         if (event->matches(QKeySequence::SelectEndOfLine)) {
 599                 int pos = cursorPos_ - (cursorPos_ % (2 * BYTES_PER_LINE)) + (2 * BYTES_PER_LINE);
 600                 setCursorPos(pos);
 601                 setSelection(pos);
 602                 setVisible = true;
 603         }
 604         if (event->matches(QKeySequence::SelectStartOfLine)) {
 605                 int pos = cursorPos_ - (cursorPos_ % (2 * BYTES_PER_LINE));
 606                 setCursorPos(pos);
 607                 setSelection(pos);
 608                 setVisible = true;
 609         }
 610         if (event->matches(QKeySequence::SelectPreviousLine)) {
 611                 int pos = cursorPos_ - (2 * BYTES_PER_LINE);
 612                 setCursorPos(pos);
 613                 setSelection(pos);
 614                 setVisible = true;
 615         }
 616         if (event->matches(QKeySequence::SelectNextLine)) {
 617                 int pos = cursorPos_ + (2 * BYTES_PER_LINE);
 618                 setCursorPos(pos);
 619                 setSelection(pos);
 620                 setVisible = true;
 621         }
 622
 623         if (event->matches(QKeySequence::SelectNextPage)) {
 624                 int pos = cursorPos_ + (((viewport()->height() / charHeight_) - 1) * 2 * BYTES_PER_LINE);
 625                 setCursorPos(pos);
 626                 setSelection(pos);
 627                 setVisible = true;
 628         }
 629         if (event->matches(QKeySequence::SelectPreviousPage)) {
 630                 int pos = cursorPos_ - (((viewport()->height() / charHeight_) - 1) * 2 * BYTES_PER_LINE);
 631                 setCursorPos(pos);
 632                 setSelection(pos);
 633                 setVisible = true;
 634         }
 635         if (event->matches(QKeySequence::SelectEndOfDocument)) {
 636                 int pos = data_size_ * 2;
 637                 setCursorPos(pos);
 638                 setSelection(pos);
 639                 setVisible = true;
 640         }
 641         if (event->matches(QKeySequence::SelectStartOfDocument)) {
 642                 setCursorPos(0);
 643                 setSelection(0);
 644                 setVisible = true;
 645         }
 646
 647         if (event->matches(QKeySequence::Copy) && (data_)) {
 648                 QString text;
 649
 650                 initialize_byte_iterator(selectBegin_ / 2);
 651
 652                 size_t selectedSize = (selectEnd_ - selectBegin_ + 1) / 2;
 653                 for (size_t i = 0; i < selectedSize; i++) {
 654                         uint8_t byte_value = get_next_byte();
 655
 656                         QString s = QString::number((byte_value & 0xF0) >> 4, 16).toUpper() +
 657                                 QString::number((byte_value & 0xF), 16).toUpper() + " ";
 658                         text += s;
 659
 660                         if (i % BYTES_PER_LINE == (BYTES_PER_LINE - 1))
 661                                 text += "\n";
 662                 }
 663
 664                 QClipboard *clipboard = QApplication::clipboard();
 665                 clipboard->setText(text, QClipboard::Clipboard);
 666                 if (clipboard->supportsSelection())
 667                         clipboard->setText(text, QClipboard::Selection);
 668         }
 669
 670         if (setVisible)
 671                 ensureVisible();
 672
 673         viewport()->update();
 674 }
 675
 676 void QHexView::mouseMoveEvent(QMouseEvent *event)
 677 {
 678         int actPos = cursorPosFromMousePos(event->pos());
 679         setCursorPos(actPos);
 680         setSelection(actPos);
 681
 682         viewport()->update();
 683 }
 684
 685 void QHexView::mousePressEvent(QMouseEvent *event)
 686 {
 687         int cPos = cursorPosFromMousePos(event->pos());
 688
 689         if ((QApplication::keyboardModifiers() & Qt::ShiftModifier) && (event->button() == Qt::LeftButton))
 690                 setSelection(cPos);
 691         else
 692                 resetSelection(cPos);
 693
 694         setCursorPos(cPos);
 695
 696         viewport()->update();
 697 }
 698
 699 size_t QHexView::cursorPosFromMousePos(const QPoint &position)
 700 {
 701         size_t pos = -1;
 702
 703         if (((size_t)position.x() >= posHex_) &&
 704                 ((size_t)position.x() < (posHex_ + HEXCHARS_IN_LINE * charWidth_))) {
 705
 706                 // Note: We add 1.5 character widths so that selection across
 707                 // byte gaps is smoother
 708                 size_t x = (position.x() + (1.5 * charWidth_ / 2) - posHex_) / charWidth_;
 709
 710                 // Note: We allow only full bytes to be selected, not nibbles,
 711                 // so we round to the nearest byte gap
 712                 x = (2 * x + 1) / 3;
 713
 714                 size_t firstLineIdx = verticalScrollBar()->value();
 715                 size_t y = ((position.y() / charHeight_) - 1) * 2 * BYTES_PER_LINE;
 716                 pos = x + y + firstLineIdx * BYTES_PER_LINE * 2;
 717         }
 718
 719         size_t max_pos = data_size_ * 2;
 720
 721         return std::min(pos, max_pos);
 722 }
 723
 724 void QHexView::resetSelection()
 725 {
 726         selectBegin_ = selectInit_;
 727         selectEnd_ = selectInit_;
 728 }
 729
 730 void QHexView::resetSelection(int pos)
 731 {
 732         if (pos < 0)
 733                 pos = 0;
 734
 735         selectInit_ = pos;
 736         selectBegin_ = pos;
 737         selectEnd_ = pos;
 738 }
 739
 740 void QHexView::setSelection(int pos)
 741 {
 742         if (pos < 0)
 743                 pos = 0;
 744
 745         if ((size_t)pos >= selectInit_) {
 746                 selectEnd_ = pos;
 747                 selectBegin_ = selectInit_;
 748         } else {
 749                 selectBegin_ = pos;
 750                 selectEnd_ = selectInit_;
 751         }
 752 }
 753
 754 void QHexView::setCursorPos(int position)
 755 {
 756         if (position < 0)
 757                 position = 0;
 758
 759         int max_pos = data_size_ * 2;
 760
 761         if (position > max_pos)
 762                 position = max_pos;
 763
 764         cursorPos_ = position;
 765 }
 766
 767 void QHexView::ensureVisible()
 768 {
 769         QSize areaSize = viewport()->size();
 770
 771         int firstLineIdx = verticalScrollBar()->value();
 772         int lastLineIdx = firstLineIdx + areaSize.height() / charHeight_;
 773
 774         int cursorY = cursorPos_ / (2 * BYTES_PER_LINE);
 775
 776         if (cursorY < firstLineIdx)
 777                 verticalScrollBar()->setValue(cursorY);
 778         else
 779                 if(cursorY >= lastLineIdx)
 780                         verticalScrollBar()->setValue(cursorY - areaSize.height() / charHeight_ + 1);
 781 }