[pulseview.git] / pv / views / decoder_binary / QHexView.cpp

/*
 * This file is part of the PulseView project.
 *
 * Copyright (C) 2015 Victor Anjin <virinext@gmail.com>
 * Copyright (C) 2019 Soeren Apel <soeren@apelpie.net>
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2015
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <QApplication>
#include <QClipboard>
#include <QDebug>
#include <QFont>
#include <QKeyEvent>
#include <QScrollBar>
#include <QSize>
#include <QPainter>
#include <QPaintEvent>

#include "QHexView.hpp"

const unsigned int BYTES_PER_LINE   = 16;
const unsigned int HEXCHARS_IN_LINE = BYTES_PER_LINE * 3 - 1;
const unsigned int GAP_ADR_HEX      = 10;
const unsigned int GAP_HEX_ASCII    = 10;
const unsigned int GAP_ASCII_SLIDER = 5;


QHexView::QHexView(QWidget *parent):
	QAbstractScrollArea(parent),
	mode_(ChunkedDataMode),
	data_(nullptr),
	selectBegin_(0),
	selectEnd_(0),
	cursorPos_(0)
{
	setFont(QFont("Courier", 10));

	charWidth_ = fontMetrics().boundingRect('X').width();
	charHeight_ = fontMetrics().height();

	// Determine X coordinates of the three sub-areas
	posAddr_  = 0;
	posHex_   = 10 * charWidth_ + GAP_ADR_HEX;
	posAscii_ = posHex_ + HEXCHARS_IN_LINE * charWidth_ + GAP_HEX_ASCII;

	setFocusPolicy(Qt::StrongFocus);

	if (palette().color(QPalette::ButtonText).toHsv().value() > 127) {
		// Color is bright
		chunk_colors_.emplace_back(100, 149, 237); // QColorConstants::Svg::cornflowerblue
		chunk_colors_.emplace_back(60, 179, 113);  // QColorConstants::Svg::mediumseagreen
		chunk_colors_.emplace_back(210, 180, 140); // QColorConstants::Svg::tan
	} else {
		// Color is dark
		chunk_colors_.emplace_back(0, 0, 139);   // QColorConstants::Svg::darkblue
		chunk_colors_.emplace_back(34, 139, 34); // QColorConstants::Svg::forestgreen
		chunk_colors_.emplace_back(160, 82, 45); // QColorConstants::Svg::sienna
	}
}

void QHexView::set_mode(Mode m)
{
	mode_ = m;

	// This is not expected to be set when data is showing,
	// so we don't update the viewport here
}

void QHexView::set_data(const DecodeBinaryClass* data)
{
	data_ = data;

	size_t size = 0;
	if (data) {
		size_t chunks = data_->chunks.size();
		for (size_t i = 0; i < chunks; i++)
			size += data_->chunks[i].data.size();
	}
	data_size_ = size;

	viewport()->update();
}

unsigned int QHexView::get_bytes_per_line() const
{
	return BYTES_PER_LINE;
}

void QHexView::clear()
{
	verticalScrollBar()->setValue(0);
	data_ = nullptr;
	data_size_ = 0;

	viewport()->update();
}

void QHexView::showFromOffset(size_t offset)
{
	if (data_ && (offset < data_size_)) {
		setCursorPos(offset * 2);

		int cursorY = cursorPos_ / (2 * BYTES_PER_LINE);
		verticalScrollBar() -> setValue(cursorY);
	}

	viewport()->update();
}

QSizePolicy QHexView::sizePolicy() const
{
	return QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding);
}

pair<size_t, size_t> QHexView::get_selection() const
{
	size_t start = selectBegin_ / 2;
	size_t end = selectEnd_ / 2;

	if (start == end) {
		// Nothing is currently selected
		start = 0;
		end = data_size_;
	} if (end < data_size_)
		end++;

	return std::make_pair(start, end);
}

size_t QHexView::create_hex_line(size_t start, size_t end, QString* dest,
	bool with_offset, bool with_ascii)
{
	dest->clear();

	// Determine start address for the row
	uint64_t row = start / BYTES_PER_LINE;
	uint64_t offset = row * BYTES_PER_LINE;
	end = std::min((uint64_t)end, offset + BYTES_PER_LINE);

	if (with_offset)
		dest->append(QString("%1 ").arg(row * BYTES_PER_LINE, 10, 16, QChar('0')).toUpper());

	initialize_byte_iterator(offset);
	for (size_t i = offset; i < offset + BYTES_PER_LINE; i++) {
		uint8_t value = 0;

		if (i < end)
			value = get_next_byte();

		if ((i < start) || (i >= end))
			dest->append("   ");
		else
			dest->append(QString("%1 ").arg(value, 2, 16, QChar('0')).toUpper());
	}

	if (with_ascii) {
		initialize_byte_iterator(offset);
		for (size_t i = offset; i < end; i++) {
			uint8_t value = get_next_byte();

			if ((value < 0x20) || (value > 0x7E))
				value = '.';

			if (i < start)
				dest->append(' ');
			else
				dest->append((char)value);
		}
	}

	return end;
}

void QHexView::initialize_byte_iterator(size_t offset)
{
	current_chunk_id_ = 0;
	current_chunk_offset_ = 0;
	current_offset_ = offset;

	size_t chunks = data_->chunks.size();
	for (size_t i = 0; i < chunks; i++) {
		size_t size = data_->chunks[i].data.size();

		if (offset >= size) {
			current_chunk_id_++;
			offset -= size;
		} else {
			current_chunk_offset_ = offset;
			break;
		}
	}

	if (current_chunk_id_ < data_->chunks.size())
		current_chunk_ = data_->chunks[current_chunk_id_];
}

uint8_t QHexView::get_next_byte(bool* is_next_chunk)
{
	if (is_next_chunk != nullptr)
		*is_next_chunk = (current_chunk_offset_ == 0);

	uint8_t v = 0;
	if (current_chunk_offset_ < current_chunk_.data.size())
		v = current_chunk_.data[current_chunk_offset_];

	current_offset_++;
	current_chunk_offset_++;

	if (current_offset_ > data_size_) {
		qWarning() << "QHexView::get_next_byte() overran binary data boundary:" <<
			current_offset_ << "of" << data_size_ << "bytes";
		return 0xEE;
	}

	if ((current_chunk_offset_ == current_chunk_.data.size()) && (current_offset_ < data_size_)) {
		current_chunk_id_++;
		current_chunk_offset_ = 0;
		current_chunk_ = data_->chunks[current_chunk_id_];
	}

	return v;
}

QSize QHexView::getFullSize() const
{
	size_t width = posAscii_ + (BYTES_PER_LINE * charWidth_);

	if (verticalScrollBar()->isEnabled())
		width += GAP_ASCII_SLIDER + verticalScrollBar()->width();

	if (!data_ || (data_size_ == 0))
		return QSize(width, 0);

	size_t height = data_size_ / BYTES_PER_LINE;

	if (data_size_ % BYTES_PER_LINE)
		height++;

	height *= charHeight_;

	return QSize(width, height);
}

void QHexView::paintEvent(QPaintEvent *event)
{
	QPainter painter(viewport());

	// Calculate and update the widget and paint area sizes
	QSize widgetSize = getFullSize();
	setMinimumWidth(widgetSize.width());
	setMaximumWidth(widgetSize.width());
	QSize areaSize = viewport()->size() - QSize(0, charHeight_);

	// Only show scrollbar if the content goes beyond the visible area
	if (widgetSize.height() > areaSize.height()) {
		verticalScrollBar()->setEnabled(true);
		verticalScrollBar()->setPageStep(areaSize.height() / charHeight_);
		verticalScrollBar()->setRange(0, ((widgetSize.height() - areaSize.height())) / charHeight_ + 1);
	} else
		verticalScrollBar()->setEnabled(false);

	// Fill widget background
	painter.fillRect(event->rect(), palette().color(QPalette::Base));

	if (!data_ || (data_size_ == 0) || (data_->chunks.empty())) {
		painter.setPen(palette().color(QPalette::Text));
		QString s = tr("No data available");
		int x = (areaSize.width() - fontMetrics().boundingRect(s).width()) / 2;
		int y = areaSize.height() / 2;
		painter.drawText(x, y, s);
		return;
	}

	// Determine first/last line indices
	size_t firstLineIdx = verticalScrollBar()->value();

	size_t lastLineIdx = firstLineIdx + (areaSize.height() / charHeight_);
	if (lastLineIdx > (data_size_ / BYTES_PER_LINE)) {
		lastLineIdx = data_size_ / BYTES_PER_LINE;
		if (data_size_ % BYTES_PER_LINE)
			lastLineIdx++;
	}

	// Paint divider line between hex and ASCII areas
	int line_x = posAscii_ - (GAP_HEX_ASCII / 2);
	painter.setPen(palette().color(QPalette::Midlight));
	painter.drawLine(line_x, event->rect().top(), line_x, height());

	// Fill address area background
	painter.fillRect(QRect(posAddr_, event->rect().top(),
		posHex_ - (GAP_ADR_HEX / 2), height()), palette().color(QPalette::Window));
	painter.fillRect(QRect(posAddr_, event->rect().top(),
		posAscii_ - (GAP_HEX_ASCII / 2), charHeight_ + 2), palette().color(QPalette::Window));

	// Paint address area
	painter.setPen(palette().color(QPalette::ButtonText));

	int yStart = 2 * charHeight_;
	for (size_t lineIdx = firstLineIdx, y = yStart; lineIdx < lastLineIdx; lineIdx++) {

		QString address = QString("%1").arg(lineIdx * 16, 10, 16, QChar('0')).toUpper();
		painter.drawText(posAddr_, y, address);
		y += charHeight_;
	}

	// Paint top row with hex offsets
	painter.setPen(palette().color(QPalette::ButtonText));
	for (int offset = 0; offset <= 0xF; offset++)
		painter.drawText(posHex_ + (1 + offset * 3) * charWidth_,
			charHeight_ - 3, QString::number(offset, 16).toUpper());

	// Paint hex values
	QBrush regular = palette().buttonText();
	QBrush selected = palette().highlight();

	bool multiple_chunks = (data_->chunks.size() > 1);
	unsigned int chunk_color = 0;

	initialize_byte_iterator(firstLineIdx * BYTES_PER_LINE);
	yStart = 2 * charHeight_;
	for (size_t lineIdx = firstLineIdx, y = yStart; lineIdx < lastLineIdx; lineIdx++) {

		int x = posHex_;
		for (size_t i = 0; (i < BYTES_PER_LINE) && (current_offset_ < data_size_); i++) {
			size_t pos = (lineIdx * BYTES_PER_LINE + i) * 2;

			// Fetch byte
			bool is_next_chunk;
			uint8_t byte_value = get_next_byte(&is_next_chunk);

			if (is_next_chunk) {
				chunk_color++;
				if (chunk_color == chunk_colors_.size())
					chunk_color = 0;
			}

			if ((pos >= selectBegin_) && (pos < selectEnd_)) {
				painter.setBackgroundMode(Qt::OpaqueMode);
				painter.setBackground(selected);
				painter.setPen(palette().color(QPalette::HighlightedText));
			} else {
				painter.setBackground(regular);
				painter.setBackgroundMode(Qt::TransparentMode);
				if (!multiple_chunks)
					painter.setPen(palette().color(QPalette::Text));
				else
					painter.setPen(chunk_colors_[chunk_color]);
			}

			// First nibble
			QString val = QString::number((byte_value & 0xF0) >> 4, 16).toUpper();
			painter.drawText(x, y, val);

			// Second nibble
			val = QString::number((byte_value & 0xF), 16).toUpper();
			painter.drawText(x + charWidth_, y, val);

			if ((pos >= selectBegin_) && (pos < selectEnd_ - 1) && (i < BYTES_PER_LINE - 1))
				painter.drawText(x + 2 * charWidth_, y, QString(' '));

			x += 3 * charWidth_;
		}

		y += charHeight_;
	}

	// Paint ASCII characters
	initialize_byte_iterator(firstLineIdx * BYTES_PER_LINE);
	yStart = 2 * charHeight_;
	for (size_t lineIdx = firstLineIdx, y = yStart; lineIdx < lastLineIdx; lineIdx++) {

		int x = posAscii_;
		for (size_t i = 0; (i < BYTES_PER_LINE) && (current_offset_ < data_size_); i++) {
			// Fetch byte
			uint8_t ch = get_next_byte();

			if ((ch < 0x20) || (ch > 0x7E))
				ch = '.';

			size_t pos = (lineIdx * BYTES_PER_LINE + i) * 2;
			if ((pos >= selectBegin_) && (pos < selectEnd_)) {
				painter.setBackgroundMode(Qt::OpaqueMode);
				painter.setBackground(selected);
				painter.setPen(palette().color(QPalette::HighlightedText));
			} else {
				painter.setBackgroundMode(Qt::TransparentMode);
				painter.setBackground(regular);
				painter.setPen(palette().color(QPalette::Text));
			}

			painter.drawText(x, y, QString(ch));
			x += charWidth_;
		}

		y += charHeight_;
	}

	// Paint cursor
	if (hasFocus()) {
		int x = (cursorPos_ % (2 * BYTES_PER_LINE));
		int y = cursorPos_ / (2 * BYTES_PER_LINE);
		y -= firstLineIdx;
		int cursorX = (((x / 2) * 3) + (x % 2)) * charWidth_ + posHex_;
		int cursorY = charHeight_ + y * charHeight_ + 4;
		painter.fillRect(cursorX, cursorY, 2, charHeight_, palette().color(QPalette::WindowText));
	}
}

void QHexView::keyPressEvent(QKeyEvent *event)
{
	bool setVisible = false;

	// Cursor movements
	if (event->matches(QKeySequence::MoveToNextChar)) {
		setCursorPos(cursorPos_ + 1);
		resetSelection(cursorPos_);
		setVisible = true;
	}
	if (event->matches(QKeySequence::MoveToPreviousChar)) {
		setCursorPos(cursorPos_ - 1);
		resetSelection(cursorPos_);
		setVisible = true;
	}

	if (event->matches(QKeySequence::MoveToEndOfLine)) {
		setCursorPos(cursorPos_ | ((BYTES_PER_LINE * 2) - 1));
		resetSelection(cursorPos_);
		setVisible = true;
	}
	if (event->matches(QKeySequence::MoveToStartOfLine)) {
		setCursorPos(cursorPos_ | (cursorPos_ % (BYTES_PER_LINE * 2)));
		resetSelection(cursorPos_);
		setVisible = true;
	}
	if (event->matches(QKeySequence::MoveToPreviousLine)) {
		setCursorPos(cursorPos_ - BYTES_PER_LINE * 2);
		resetSelection(cursorPos_);
		setVisible = true;
	}
	if (event->matches(QKeySequence::MoveToNextLine)) {
		setCursorPos(cursorPos_ + BYTES_PER_LINE * 2);
		resetSelection(cursorPos_);
		setVisible = true;
	}

	if (event->matches(QKeySequence::MoveToNextPage)) {
		setCursorPos(cursorPos_ + (viewport()->height() / charHeight_ - 1) * 2 * BYTES_PER_LINE);
		resetSelection(cursorPos_);
		setVisible = true;
	}
	if (event->matches(QKeySequence::MoveToPreviousPage)) {
		setCursorPos(cursorPos_ - (viewport()->height() / charHeight_ - 1) * 2 * BYTES_PER_LINE);
		resetSelection(cursorPos_);
		setVisible = true;
	}
	if (event->matches(QKeySequence::MoveToEndOfDocument)) {
		setCursorPos(data_size_ * 2);
		resetSelection(cursorPos_);
		setVisible = true;
	}
	if (event->matches(QKeySequence::MoveToStartOfDocument)) {
		setCursorPos(0);
		resetSelection(cursorPos_);
		setVisible = true;
	}

	// Select commands
	if (event->matches(QKeySequence::SelectAll)) {
		resetSelection(0);
		setSelection(2 * data_size_);
		setVisible = true;
	}
	if (event->matches(QKeySequence::SelectNextChar)) {
		int pos = cursorPos_ + 1;
		setCursorPos(pos);
		setSelection(pos);
		setVisible = true;
	}
	if (event->matches(QKeySequence::SelectPreviousChar)) {
		int pos = cursorPos_ - 1;
		setSelection(pos);
		setCursorPos(pos);
		setVisible = true;
	}
	if (event->matches(QKeySequence::SelectEndOfLine)) {
		int pos = cursorPos_ - (cursorPos_ % (2 * BYTES_PER_LINE)) + (2 * BYTES_PER_LINE);
		setCursorPos(pos);
		setSelection(pos);
		setVisible = true;
	}
	if (event->matches(QKeySequence::SelectStartOfLine)) {
		int pos = cursorPos_ - (cursorPos_ % (2 * BYTES_PER_LINE));
		setCursorPos(pos);
		setSelection(pos);
		setVisible = true;
	}
	if (event->matches(QKeySequence::SelectPreviousLine)) {
		int pos = cursorPos_ - (2 * BYTES_PER_LINE);
		setCursorPos(pos);
		setSelection(pos);
		setVisible = true;
	}
	if (event->matches(QKeySequence::SelectNextLine)) {
		int pos = cursorPos_ + (2 * BYTES_PER_LINE);
		setCursorPos(pos);
		setSelection(pos);
		setVisible = true;
	}

	if (event->matches(QKeySequence::SelectNextPage)) {
		int pos = cursorPos_ + (((viewport()->height() / charHeight_) - 1) * 2 * BYTES_PER_LINE);
		setCursorPos(pos);
		setSelection(pos);
		setVisible = true;
	}
	if (event->matches(QKeySequence::SelectPreviousPage)) {
		int pos = cursorPos_ - (((viewport()->height() / charHeight_) - 1) * 2 * BYTES_PER_LINE);
		setCursorPos(pos);
		setSelection(pos);
		setVisible = true;
	}
	if (event->matches(QKeySequence::SelectEndOfDocument)) {
		int pos = data_size_ * 2;
		setCursorPos(pos);
		setSelection(pos);
		setVisible = true;
	}
	if (event->matches(QKeySequence::SelectStartOfDocument)) {
		setCursorPos(0);
		setSelection(0);
		setVisible = true;
	}

	if (event->matches(QKeySequence::Copy) && (data_)) {
		QString text;

		initialize_byte_iterator(selectBegin_ / 2);

		size_t selectedSize = (selectEnd_ - selectBegin_ + 1) / 2;
		for (size_t i = 0; i < selectedSize; i++) {
			uint8_t byte_value = get_next_byte();

			QString s = QString::number((byte_value & 0xF0) >> 4, 16).toUpper() +
				QString::number((byte_value & 0xF), 16).toUpper() + " ";
			text += s;

			if (i % BYTES_PER_LINE == (BYTES_PER_LINE - 1))
				text += "\n";
		}

		QClipboard *clipboard = QApplication::clipboard();
		clipboard->setText(text, QClipboard::Clipboard);
		if (clipboard->supportsSelection())
			clipboard->setText(text, QClipboard::Selection);
	}

	if (setVisible)
		ensureVisible();

	viewport()->update();
}

void QHexView::mouseMoveEvent(QMouseEvent *event)
{
	int actPos = cursorPosFromMousePos(event->pos());
	setCursorPos(actPos);
	setSelection(actPos);

	viewport()->update();
}

void QHexView::mousePressEvent(QMouseEvent *event)
{
	int cPos = cursorPosFromMousePos(event->pos());

	if ((QApplication::keyboardModifiers() & Qt::ShiftModifier) && (event->button() == Qt::LeftButton))
		setSelection(cPos);
	else
		resetSelection(cPos);

	setCursorPos(cPos);

	viewport()->update();
}

size_t QHexView::cursorPosFromMousePos(const QPoint &position)
{
	size_t pos = -1;

	if (((size_t)position.x() >= posHex_) &&
		((size_t)position.x() < (posHex_ + HEXCHARS_IN_LINE * charWidth_))) {

		// Note: We add 1.5 character widths so that selection across
		// byte gaps is smoother
		size_t x = (position.x() + (1.5 * charWidth_ / 2) - posHex_) / charWidth_;

		// Note: We allow only full bytes to be selected, not nibbles,
		// so we round to the nearest byte gap
		x = (2 * x + 1) / 3;

		size_t firstLineIdx = verticalScrollBar()->value();
		size_t y = ((position.y() / charHeight_) - 1) * 2 * BYTES_PER_LINE;
		pos = x + y + firstLineIdx * BYTES_PER_LINE * 2;
	}

	size_t max_pos = data_size_ * 2;

	return std::min(pos, max_pos);
}

void QHexView::resetSelection()
{
	selectBegin_ = selectInit_;
	selectEnd_ = selectInit_;
}

void QHexView::resetSelection(int pos)
{
	if (pos < 0)
		pos = 0;

	selectInit_ = pos;
	selectBegin_ = pos;
	selectEnd_ = pos;
}

void QHexView::setSelection(int pos)
{
	if (pos < 0)
		pos = 0;

	if ((size_t)pos >= selectInit_) {
		selectEnd_ = pos;
		selectBegin_ = selectInit_;
	} else {
		selectBegin_ = pos;
		selectEnd_ = selectInit_;
	}
}

void QHexView::setCursorPos(int position)
{
	if (position < 0)
		position = 0;

	int max_pos = data_size_ * 2;

	if (position > max_pos)
		position = max_pos;

	cursorPos_ = position;
}

void QHexView::ensureVisible()
{
	QSize areaSize = viewport()->size();

	int firstLineIdx = verticalScrollBar()->value();
	int lastLineIdx = firstLineIdx + areaSize.height() / charHeight_;

	int cursorY = cursorPos_ / (2 * BYTES_PER_LINE);

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