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