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regexpdialog.cpp Example File
tools/regexp/regexpdialog.cpp

    #include "regexpdialog.h"

    RegExpDialog::RegExpDialog(QWidget *parent)
        : QDialog(parent)
    {
        patternComboBox = new QComboBox(this);
        patternComboBox->setEditable(true);
        patternComboBox->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
        patternComboBox->insertItem(tr("([A-Za-z_])([A-Za-z_0-9]*)"));

        patternLabel = new QLabel(tr("&Pattern:"), this);
        patternLabel->setBuddy(patternComboBox);

        textComboBox = new QComboBox(this);
        textComboBox->setEditable(true);
        textComboBox->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
        textComboBox->insertItem(tr("(10 + delta4) * 32"));

        textLabel = new QLabel(tr("&Text:"), this);
        textLabel->setBuddy(textComboBox);

        caseSensitiveCheckBox = new QCheckBox(tr("Case &Sensitive"), this);
        caseSensitiveCheckBox->setChecked(true);
        minimalCheckBox = new QCheckBox(tr("&Minimal"), this);
        wildcardCheckBox = new QCheckBox(tr("&Wildcard"), this);

        indexLabel = new QLabel(tr("Index of Match:"), this);
        indexEdit = new QLineEdit(this);
        indexEdit->setReadOnly(true);

        matchedLengthLabel = new QLabel(tr("Matched Length:"), this);
        matchedLengthEdit = new QLineEdit(this);
        matchedLengthEdit->setReadOnly(true);

        for (int i = 0; i < MaxCaptures; ++i) {
            captureLabels[i] = new QLabel(tr("Capture %1:").arg(i), this);
            captureEdits[i] = new QLineEdit(this);
            captureEdits[i]->setReadOnly(true);
        }
        captureLabels[0]->setText(tr("Match:"));

        copyButton = new QPushButton(tr("&Copy"), this);
        quitButton = new QPushButton(tr("&Quit"), this);

        QGridLayout *gridLayout = new QGridLayout;
        gridLayout->addWidget(patternLabel, 0, 0);
        gridLayout->addWidget(patternComboBox, 0, 1);
        gridLayout->addWidget(textLabel, 1, 0);
        gridLayout->addWidget(textComboBox, 1, 1);

        QHBoxLayout *checkboxLayout = new QHBoxLayout;
        checkboxLayout->addWidget(caseSensitiveCheckBox);
        checkboxLayout->addWidget(minimalCheckBox);
        checkboxLayout->addWidget(wildcardCheckBox);
        checkboxLayout->addStretch(1);

        QHBoxLayout *buttonLayout = new QHBoxLayout;
        buttonLayout->addStretch(1);
        buttonLayout->addWidget(copyButton);
        buttonLayout->addWidget(quitButton);

        QGridLayout *middleLayout = new QGridLayout;
        middleLayout->addWidget(indexLabel, 0, 0);
        middleLayout->addWidget(indexEdit, 0, 1);
        middleLayout->addWidget(matchedLengthLabel, 1, 0);
        middleLayout->addWidget(matchedLengthEdit, 1, 1);

        for (int j = 0; j < MaxCaptures; ++j) {
            middleLayout->addWidget(captureLabels[j], j + 2, 0);
            middleLayout->addWidget(captureEdits[j], j + 2, 1);
        }

        QVBoxLayout *mainLayout = new QVBoxLayout(this);
        mainLayout->addLayout(gridLayout);
        mainLayout->addLayout(checkboxLayout);
        mainLayout->addLayout(middleLayout);
        mainLayout->addLayout(buttonLayout);

        connect(patternComboBox, SIGNAL(textChanged(QString)), this, SLOT(refresh()));
        connect(textComboBox, SIGNAL(textChanged(QString)), this, SLOT(refresh()));
        connect(caseSensitiveCheckBox, SIGNAL(toggled(bool)), this, SLOT(refresh()));
        connect(minimalCheckBox, SIGNAL(toggled(bool)), this, SLOT(refresh()));
        connect(wildcardCheckBox, SIGNAL(toggled(bool)), this, SLOT(refresh()));

        connect(copyButton, SIGNAL(clicked()), this, SLOT(copy()));
        connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));

        setWindowTitle(tr("RegExp"));
        refresh();
    }

    void RegExpDialog::refresh()
    {
        QString pattern = patternComboBox->currentText();
        QString text = textComboBox->currentText();

        QRegExp rx(pattern);
        Qt::CaseSensitivity cs = Qt::CaseInsensitive;
        if (caseSensitiveCheckBox->isChecked())
            cs = Qt::CaseSensitive;
        rx.setCaseSensitivity(cs);
        rx.setMinimal(minimalCheckBox->isChecked());
        QRegExp::PatternSyntax syntax =
                wildcardCheckBox->isChecked() ? QRegExp::Wildcard : QRegExp::RegExp;
        rx.setPatternSyntax(syntax);

        QPalette pal = patternComboBox->palette();
        if (rx.isValid())
            pal.setColor(QPalette::Text, palette().color(QPalette::Text));
        else
            pal.setColor(QPalette::Text, Qt::red);
        patternComboBox->setPalette(pal);

        indexEdit->setText(QString::number(rx.indexIn(text)));
        matchedLengthEdit->setText(QString::number(rx.matchedLength()));
        for (int i = 0; i < MaxCaptures; ++i) {
            captureLabels[i]->setEnabled(i <= rx.numCaptures());
            captureEdits[i]->setEnabled(i <= rx.numCaptures());
            captureEdits[i]->setText(rx.cap(i));
        }
    }

    void RegExpDialog::copy()
    {
        QString escaped = patternComboBox->currentText();
        escaped = escaped.replace("\\", "\\\\");
        escaped = "\"" + escaped + "\"";

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


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Qt 4.0.0-b1