previewform.cpp Example File

tools/codecs/previewform.cpp
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#include <QtWidgets> #include "previewform.h" // Helpers for creating hex dumps static void indent(QTextStream &str, int indent) { for (int i = 0; i < indent; ++i) str << ' '; } static void formatHex(QTextStream &str, const QByteArray &data) { const int fieldWidth = str.fieldWidth(); const QTextStream::FieldAlignment alignment = str.fieldAlignment(); const int base = str.integerBase(); const QChar padChar = str.padChar(); str.setIntegerBase(16); str.setPadChar(QLatin1Char('0')); str.setFieldAlignment(QTextStream::AlignRight); const unsigned char *p = reinterpret_cast<const unsigned char *>(data.constBegin()); for (const unsigned char *end = p + data.size(); p < end; ++p) { str << ' '; str.setFieldWidth(2); str << unsigned(*p); str.setFieldWidth(fieldWidth); } str.setFieldAlignment(alignment); str.setPadChar(padChar); str.setIntegerBase(base); } static void formatPrintableCharacters(QTextStream &str, const QByteArray &data) { for (int i = 0, size = data.size(); i < size; ++i) { const char c = data.at(i); switch (c) { case '\0': str << "\\0"; break; case '\t': str << "\\t"; break; case '\r': str << "\\r"; break; case '\n': str << "\\n"; break; default: if (c >= 32 && uchar(c) < 127) str << ' ' << c; else str << ".."; break; } } } static QString formatHexDump(const QByteArray &data) { enum { lineWidth = 16 }; QString result; QTextStream str(&result); str.setIntegerBase(16); str.setPadChar(QLatin1Char('0')); const int fieldWidth = str.fieldWidth(); const QTextStream::FieldAlignment alignment = str.fieldAlignment(); for (int a = 0, size = data.size(); a < size; a += lineWidth) { str.setFieldAlignment(QTextStream::AlignRight); str.setFieldWidth(8); str << a; str.setFieldWidth(fieldWidth); str.setFieldAlignment(alignment); const int end = qMin(a + lineWidth, size); const QByteArray line = data.mid(a, end - a); formatHex(str, line); indent(str, 3 * (lineWidth - line.size())); str << ' '; formatPrintableCharacters(str, line); indent(str, 2 * (lineWidth - line.size())); str << '\n'; } return result; } PreviewForm::PreviewForm(QWidget *parent) : QDialog(parent) { setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint); encodingComboBox = new QComboBox; QLabel *encodingLabel = new QLabel(tr("&Encoding:")); encodingLabel->setBuddy(encodingComboBox); textEdit = new QPlainTextEdit; textEdit->setLineWrapMode(QPlainTextEdit::NoWrap); textEdit->setReadOnly(true); hexDumpEdit = new QPlainTextEdit; hexDumpEdit->setLineWrapMode(QPlainTextEdit::NoWrap); hexDumpEdit->setReadOnly(true); hexDumpEdit->setFont(QFontDatabase::systemFont(QFontDatabase::FixedFont)); QDialogButtonBox *buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel); okButton = buttonBox->button(QDialogButtonBox::Ok); connect(encodingComboBox, QOverload<int>::of(&QComboBox::activated), this, &PreviewForm::updateTextEdit); connect(buttonBox, &QDialogButtonBox::accepted, this, &QDialog::accept); connect(buttonBox, &QDialogButtonBox::rejected, this, &QDialog::reject); QGridLayout *mainLayout = new QGridLayout(this); mainLayout->addWidget(encodingLabel, 0, 0); mainLayout->addWidget(encodingComboBox, 0, 1); tabWidget = new QTabWidget; tabWidget->addTab(textEdit, tr("Preview")); tabWidget->addTab(hexDumpEdit, tr("Hex Dump")); mainLayout->addWidget(tabWidget, 1, 0, 1, 2); statusLabel = new QLabel; mainLayout->addWidget(statusLabel, 2, 0, 1, 2); mainLayout->addWidget(buttonBox, 3, 0, 1, 2); const QRect screenGeometry = QApplication::desktop()->screenGeometry(this); resize(screenGeometry.width() * 2 / 5, screenGeometry.height() / 2); } void PreviewForm::setCodecList(const QList<QTextCodec *> &list) { encodingComboBox->clear(); foreach (const QTextCodec *codec, list) { encodingComboBox->addItem(QLatin1String(codec->name()), QVariant(codec->mibEnum())); } } void PreviewForm::reset() { decodedStr.clear(); textEdit->clear(); hexDumpEdit->clear(); statusLabel->clear(); statusLabel->setStyleSheet(QString()); okButton->setEnabled(false); tabWidget->setCurrentIndex(0); } void PreviewForm::setEncodedData(const QByteArray &data) { reset(); encodedData = data; hexDumpEdit->setPlainText(formatHexDump(data)); updateTextEdit(); } void PreviewForm::updateTextEdit() { int mib = encodingComboBox->itemData( encodingComboBox->currentIndex()).toInt(); const QTextCodec *codec = QTextCodec::codecForMib(mib); const QString name = QLatin1String(codec->name()); QTextCodec::ConverterState state; decodedStr = codec->toUnicode(encodedData.constData(), encodedData.size(), &state); bool success = true; if (state.remainingChars) { success = false; const QString message = tr("%1: conversion error at character %2") .arg(name).arg(encodedData.size() - state.remainingChars + 1); statusLabel->setText(message); statusLabel->setStyleSheet(QStringLiteral("background-color: \"red\";")); } else if (state.invalidChars) { statusLabel->setText(tr("%1: %n invalid characters", 0, state.invalidChars).arg(name)); statusLabel->setStyleSheet(QStringLiteral("background-color: \"yellow\";")); } else { statusLabel->setText(tr("%1: %n bytes converted", 0, encodedData.size()).arg(name)); statusLabel->setStyleSheet(QString()); } if (success) textEdit->setPlainText(decodedStr); else textEdit->clear(); okButton->setEnabled(success); }