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