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Diffstat (limited to 'examples/widgets/tools/codecs/encodingdialog.cpp')
| -rw-r--r-- | examples/widgets/tools/codecs/encodingdialog.cpp | 333 |
1 files changed, 333 insertions, 0 deletions
diff --git a/examples/widgets/tools/codecs/encodingdialog.cpp b/examples/widgets/tools/codecs/encodingdialog.cpp new file mode 100644 index 0000000000..ca4b56db9e --- /dev/null +++ b/examples/widgets/tools/codecs/encodingdialog.cpp @@ -0,0 +1,333 @@ +/**************************************************************************** +** +** Copyright (C) 2018 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** BSD License Usage +** Alternatively, you may use this file under the terms of the BSD license +** as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of The Qt Company Ltd nor the names of its +** contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "encodingdialog.h" + +#if QT_CONFIG(action) +# include <QAction> +#endif +#include <QDialogButtonBox> +#include <QFormLayout> +#include <QLabel> +#include <QLineEdit> +#include <QVBoxLayout> + +#if QT_CONFIG(clipboard) +# include <QGuiApplication> +# include <QClipboard> +#endif + +#include <QTextStream> + +// Helpers for formatting character sequences + +// Format a special character like '\x0a' +template <class Int> +static void formatEscapedNumber(QTextStream &str, Int value, int base, + int width = 0,char prefix = 0) +{ + str << '\\'; + if (prefix) + str << prefix; + const auto oldPadChar = str.padChar(); + const auto oldFieldWidth = str.fieldWidth(); + const auto oldFieldAlignment = str.fieldAlignment(); + const auto oldIntegerBase = str.integerBase(); + str.setPadChar(QLatin1Char('0')); + str.setFieldWidth(width); + str.setFieldAlignment(QTextStream::AlignRight); + str.setIntegerBase(base); + str << value; + str.setIntegerBase(oldIntegerBase); + str.setFieldAlignment(oldFieldAlignment); + str.setFieldWidth(oldFieldWidth); + str.setPadChar(oldPadChar); +} + +template <class Int> +static bool formatSpecialCharacter(QTextStream &str, Int value) +{ + bool result = true; + switch (value) { + case '\\': + str << "\\\\"; + break; + case '\"': + str << "\\\""; + break; + case '\n': + str << "\\n"; + break; + default: + result = false; + break; + } + return result; +} + +// Format a sequence of characters (QChar, ushort (UTF-16), uint (UTF-32) +// or just char (Latin1, Utf-8)) with the help of traits specifying +// how to obtain the code for checking the printable-ness and how to +// stream out the plain ASCII values. + +template <EncodingDialog::Encoding> +struct FormattingTraits +{ +}; + +template <> +struct FormattingTraits<EncodingDialog::Unicode> +{ + static ushort code(QChar c) { return c.unicode(); } + static char toAscii(QChar c) { return c.toLatin1(); } +}; + +template <> +struct FormattingTraits<EncodingDialog::Utf8> +{ + static ushort code(char c) { return uchar(c); } + static char toAscii(char c) { return c; } +}; + +template <> +struct FormattingTraits<EncodingDialog::Utf16> +{ + static ushort code(ushort c) { return c; } + static char toAscii(ushort c) { return char(c); } +}; + +template <> +struct FormattingTraits<EncodingDialog::Utf32> +{ + static uint code(uint c) { return c; } + static char toAscii(uint c) { return char(c); } +}; + +template <> +struct FormattingTraits<EncodingDialog::Latin1> +{ + static uchar code(char c) { return uchar(c); } + static char toAscii(char c) { return c; } +}; + +static bool isHexDigit(char c) +{ + return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') + || (c >= 'A' && c <= 'F'); +} + +template <EncodingDialog::Encoding encoding, class Iterator> +static void formatStringSequence(QTextStream &str, Iterator i1, Iterator i2, + int escapeIntegerBase, int escapeWidth, + char escapePrefix = 0) +{ + str << '"'; + bool separateHexEscape = false; + for (; i1 != i2; ++i1) { + const auto code = FormattingTraits<encoding>::code(*i1); + if (code >= 0x80) { + formatEscapedNumber(str, code, escapeIntegerBase, escapeWidth, escapePrefix); + separateHexEscape = escapeIntegerBase == 16 && escapeWidth == 0; + } else { + if (!formatSpecialCharacter(str, code)) { + const char c = FormattingTraits<encoding>::toAscii(*i1); + // For variable width/hex: Terminate the literal to stop digit parsing + // ("\x12" "34..."). + if (separateHexEscape && isHexDigit(c)) + str << "\" \""; + str << c; + } + separateHexEscape = false; + } + } + str << '"'; +} + +static QString encodedString(const QString &value, EncodingDialog::Encoding e) +{ + QString result; + QTextStream str(&result); + switch (e) { + case EncodingDialog::Unicode: + formatStringSequence<EncodingDialog::Unicode>(str, value.cbegin(), value.cend(), + 16, 4, 'u'); + break; + case EncodingDialog::Utf8: { + const QByteArray utf8 = value.toUtf8(); + str << "u8"; + formatStringSequence<EncodingDialog::Utf8>(str, utf8.cbegin(), utf8.cend(), + 8, 3); + } + break; + case EncodingDialog::Utf16: { + auto utf16 = value.utf16(); + auto utf16End = utf16 + value.size(); + str << 'u'; + formatStringSequence<EncodingDialog::Utf16>(str, utf16, utf16End, + 16, 0, 'x'); + } + break; + case EncodingDialog::Utf32: { + auto utf32 = value.toUcs4(); + str << 'U'; + formatStringSequence<EncodingDialog::Utf32>(str, utf32.cbegin(), utf32.cend(), + 16, 0, 'x'); + } + break; + case EncodingDialog::Latin1: { + const QByteArray latin1 = value.toLatin1(); + formatStringSequence<EncodingDialog::Latin1>(str, latin1.cbegin(), latin1.cend(), + 16, 0, 'x'); + } + break; + case EncodingDialog::EncodingCount: + break; + } + return result; +} + +// Dialog helpers + +static const char *encodingLabels[] +{ + QT_TRANSLATE_NOOP("EncodingDialog", "Unicode:"), + QT_TRANSLATE_NOOP("EncodingDialog", "UTF-8:"), + QT_TRANSLATE_NOOP("EncodingDialog", "UTF-16:"), + QT_TRANSLATE_NOOP("EncodingDialog", "UTF-32:"), + QT_TRANSLATE_NOOP("EncodingDialog", "Latin1:") +}; + +static const char *encodingToolTips[] +{ + QT_TRANSLATE_NOOP("EncodingDialog", "Unicode points for use with any encoding (C++, Python)"), + QT_TRANSLATE_NOOP("EncodingDialog", "QString::fromUtf8()"), + QT_TRANSLATE_NOOP("EncodingDialog", "QStringViewLiteral(), wchar_t on Windows"), + QT_TRANSLATE_NOOP("EncodingDialog", "wchar_t on Unix (Ucs4)"), + QT_TRANSLATE_NOOP("EncodingDialog", "QLatin1String") +}; + +// A read-only line edit with a tool button to copy the contents +class DisplayLineEdit : public QLineEdit +{ + Q_OBJECT +public: + explicit DisplayLineEdit(const QIcon &icon, QWidget *parent = nullptr); + +public slots: + void copyAll(); +}; + +DisplayLineEdit::DisplayLineEdit(const QIcon &icon, QWidget *parent) : + QLineEdit(parent) +{ + setReadOnly(true); +#if QT_CONFIG(clipboard) && QT_CONFIG(action) + auto copyAction = addAction(icon, QLineEdit::TrailingPosition); + connect(copyAction, &QAction::triggered, this, &DisplayLineEdit::copyAll); +#endif +} + +void DisplayLineEdit::copyAll() +{ +#if QT_CONFIG(clipboard) + QGuiApplication::clipboard()->setText(text()); +#endif +} + +static void addFormLayoutRow(QFormLayout *formLayout, const QString &text, + QWidget *w, const QString &toolTip) +{ + auto label = new QLabel(text); + label->setToolTip(toolTip); + w->setToolTip(toolTip); + label->setBuddy(w); + formLayout->addRow(label, w); +} + +EncodingDialog::EncodingDialog(QWidget *parent) : + QDialog(parent) +{ + setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint); + setWindowTitle(tr("Encodings")); + + auto formLayout = new QFormLayout; + auto sourceLineEdit = new QLineEdit(this); + sourceLineEdit->setClearButtonEnabled(true); + connect(sourceLineEdit, &QLineEdit::textChanged, this, &EncodingDialog::textChanged); + + addFormLayoutRow(formLayout, tr("&Source:"), sourceLineEdit, tr("Enter text")); + + const auto copyIcon = QIcon::fromTheme(QLatin1String("edit-copy"), + QIcon(QLatin1String(":/images/editcopy"))); + for (int i = 0; i < EncodingCount; ++i) { + m_lineEdits[i] = new DisplayLineEdit(copyIcon, this); + addFormLayoutRow(formLayout, tr(encodingLabels[i]), + m_lineEdits[i], tr(encodingToolTips[i])); + } + + auto mainLayout = new QVBoxLayout(this); + mainLayout->addLayout(formLayout); + auto buttonBox = new QDialogButtonBox(QDialogButtonBox::Close); + connect(buttonBox, &QDialogButtonBox::rejected, this, &QDialog::reject); + mainLayout->addWidget(buttonBox); +} + +void EncodingDialog::textChanged(const QString &t) +{ + if (t.isEmpty()) { + for (auto lineEdit : m_lineEdits) + lineEdit->clear(); + } else { + for (int i = 0; i < EncodingCount; ++i) + m_lineEdits[i]->setText(encodedString(t, static_cast<Encoding>(i))); + } +} + +#include "encodingdialog.moc" |