qt5base-lts/examples/widgets/richtext/textedit/textedit.cpp

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#include <QAction>
#include <QApplication>
#include <QClipboard>
#include <QColorDialog>
#include <QComboBox>
#include <QFontComboBox>
#include <QFile>
#include <QFileDialog>
#include <QFileInfo>
#include <QFontDatabase>
#include <QMenu>
#include <QMenuBar>
#include <QTextCodec>
#include <QTextEdit>
#include <QStatusBar>
#include <QToolBar>
#include <QTextCursor>
#include <QTextDocumentWriter>
#include <QTextList>
#include <QtDebug>
#include <QCloseEvent>
#include <QMessageBox>
#include <QMimeData>
#if defined(QT_PRINTSUPPORT_LIB)
#include <QtPrintSupport/qtprintsupportglobal.h>
#if QT_CONFIG(printer)
#if QT_CONFIG(printdialog)
#include <QPrintDialog>
#endif
#include <QPrinter>
#if QT_CONFIG(printpreviewdialog)
#include <QPrintPreviewDialog>
#endif
#endif
#endif

#include "textedit.h"

#ifdef Q_OS_MAC
const QString rsrcPath = ":/images/mac";
#else
const QString rsrcPath = ":/images/win";
#endif

TextEdit::TextEdit(QWidget *parent)
    : QMainWindow(parent)
{
#ifdef Q_OS_OSX
    setUnifiedTitleAndToolBarOnMac(true);
#endif
    setWindowTitle(QCoreApplication::applicationName());

    textEdit = new QTextEdit(this);
    connect(textEdit, &QTextEdit::currentCharFormatChanged,
            this, &TextEdit::currentCharFormatChanged);
    connect(textEdit, &QTextEdit::cursorPositionChanged,
            this, &TextEdit::cursorPositionChanged);
    setCentralWidget(textEdit);

    setToolButtonStyle(Qt::ToolButtonFollowStyle);
    setupFileActions();
    setupEditActions();
    setupTextActions();

    {
        QMenu *helpMenu = menuBar()->addMenu(tr("Help"));
        helpMenu->addAction(tr("About"), this, &TextEdit::about);
        helpMenu->addAction(tr("About &Qt"), qApp, &QApplication::aboutQt);
    }

    QFont textFont("Helvetica");
    textFont.setStyleHint(QFont::SansSerif);
    textEdit->setFont(textFont);
    fontChanged(textEdit->font());
    colorChanged(textEdit->textColor());
    alignmentChanged(textEdit->alignment());

    connect(textEdit->document(), &QTextDocument::modificationChanged,
            actionSave, &QAction::setEnabled);
    connect(textEdit->document(), &QTextDocument::modificationChanged,
            this, &QWidget::setWindowModified);
    connect(textEdit->document(), &QTextDocument::undoAvailable,
            actionUndo, &QAction::setEnabled);
    connect(textEdit->document(), &QTextDocument::redoAvailable,
            actionRedo, &QAction::setEnabled);

    setWindowModified(textEdit->document()->isModified());
    actionSave->setEnabled(textEdit->document()->isModified());
    actionUndo->setEnabled(textEdit->document()->isUndoAvailable());
    actionRedo->setEnabled(textEdit->document()->isRedoAvailable());

#ifndef QT_NO_CLIPBOARD
    actionCut->setEnabled(false);
    actionCopy->setEnabled(false);

    connect(QApplication::clipboard(), &QClipboard::dataChanged, this, &TextEdit::clipboardDataChanged);
#endif

    textEdit->setFocus();
    setCurrentFileName(QString());
}

void TextEdit::closeEvent(QCloseEvent *e)
{
    if (maybeSave())
        e->accept();
    else
        e->ignore();
}

void TextEdit::setupFileActions()
{
    QToolBar *tb = addToolBar(tr("File Actions"));
    QMenu *menu = menuBar()->addMenu(tr("&File"));

    const QIcon newIcon = QIcon::fromTheme("document-new", QIcon(rsrcPath + "/filenew.png"));
    QAction *a = menu->addAction(newIcon,  tr("&New"), this, &TextEdit::fileNew);
    tb->addAction(a);
    a->setPriority(QAction::LowPriority);
    a->setShortcut(QKeySequence::New);

    const QIcon openIcon = QIcon::fromTheme("document-open", QIcon(rsrcPath + "/fileopen.png"));
    a = menu->addAction(openIcon, tr("&Open..."), this, &TextEdit::fileOpen);
    a->setShortcut(QKeySequence::Open);
    tb->addAction(a);

    menu->addSeparator();

    const QIcon saveIcon = QIcon::fromTheme("document-save", QIcon(rsrcPath + "/filesave.png"));
    actionSave = menu->addAction(saveIcon, tr("&Save"), this, &TextEdit::fileSave);
    actionSave->setShortcut(QKeySequence::Save);
    actionSave->setEnabled(false);
    tb->addAction(actionSave);

    a = menu->addAction(tr("Save &As..."), this, &TextEdit::fileSaveAs);
    a->setPriority(QAction::LowPriority);
    menu->addSeparator();

#ifndef QT_NO_PRINTER
    const QIcon printIcon = QIcon::fromTheme("document-print", QIcon(rsrcPath + "/fileprint.png"));
    a = menu->addAction(printIcon, tr("&Print..."), this, &TextEdit::filePrint);
    a->setPriority(QAction::LowPriority);
    a->setShortcut(QKeySequence::Print);
    tb->addAction(a);

    const QIcon filePrintIcon = QIcon::fromTheme("fileprint", QIcon(rsrcPath + "/fileprint.png"));
    menu->addAction(filePrintIcon, tr("Print Preview..."), this, &TextEdit::filePrintPreview);

    const QIcon exportPdfIcon = QIcon::fromTheme("exportpdf", QIcon(rsrcPath + "/exportpdf.png"));
    a = menu->addAction(exportPdfIcon, tr("&Export PDF..."), this, &TextEdit::filePrintPdf);
    a->setPriority(QAction::LowPriority);
    a->setShortcut(Qt::CTRL + Qt::Key_D);
    tb->addAction(a);

    menu->addSeparator();
#endif

    a = menu->addAction(tr("&Quit"), this, &QWidget::close);
    a->setShortcut(Qt::CTRL + Qt::Key_Q);
}

void TextEdit::setupEditActions()
{
    QToolBar *tb = addToolBar(tr("Edit Actions"));
    QMenu *menu = menuBar()->addMenu(tr("&Edit"));

    const QIcon undoIcon = QIcon::fromTheme("edit-undo", QIcon(rsrcPath + "/editundo.png"));
    actionUndo = menu->addAction(undoIcon, tr("&Undo"), textEdit, &QTextEdit::undo);
    actionUndo->setShortcut(QKeySequence::Undo);
    tb->addAction(actionUndo);

    const QIcon redoIcon = QIcon::fromTheme("edit-redo", QIcon(rsrcPath + "/editredo.png"));
    actionRedo = menu->addAction(redoIcon, tr("&Redo"), textEdit, &QTextEdit::redo);
    actionRedo->setPriority(QAction::LowPriority);
    actionRedo->setShortcut(QKeySequence::Redo);
    tb->addAction(actionRedo);
    menu->addSeparator();

#ifndef QT_NO_CLIPBOARD
    const QIcon cutIcon = QIcon::fromTheme("edit-cut", QIcon(rsrcPath + "/editcut.png"));
    actionCut = menu->addAction(cutIcon, tr("Cu&t"), textEdit, &QTextEdit::cut);
    actionCut->setPriority(QAction::LowPriority);
    actionCut->setShortcut(QKeySequence::Cut);
    tb->addAction(actionCut);

    const QIcon copyIcon = QIcon::fromTheme("edit-copy", QIcon(rsrcPath + "/editcopy.png"));
    actionCopy = menu->addAction(copyIcon, tr("&Copy"), textEdit, &QTextEdit::copy);
    actionCopy->setPriority(QAction::LowPriority);
    actionCopy->setShortcut(QKeySequence::Copy);
    tb->addAction(actionCopy);

    const QIcon pasteIcon = QIcon::fromTheme("edit-paste", QIcon(rsrcPath + "/editpaste.png"));
    actionPaste = menu->addAction(pasteIcon, tr("&Paste"), textEdit, &QTextEdit::paste);
    actionPaste->setPriority(QAction::LowPriority);
    actionPaste->setShortcut(QKeySequence::Paste);
    tb->addAction(actionPaste);
    if (const QMimeData *md = QApplication::clipboard()->mimeData())
        actionPaste->setEnabled(md->hasText());
#endif
}

void TextEdit::setupTextActions()
{
    QToolBar *tb = addToolBar(tr("Format Actions"));
    QMenu *menu = menuBar()->addMenu(tr("F&ormat"));

    const QIcon boldIcon = QIcon::fromTheme("format-text-bold", QIcon(rsrcPath + "/textbold.png"));
    actionTextBold = menu->addAction(boldIcon, tr("&Bold"), this, &TextEdit::textBold);
    actionTextBold->setShortcut(Qt::CTRL + Qt::Key_B);
    actionTextBold->setPriority(QAction::LowPriority);
    QFont bold;
    bold.setBold(true);
    actionTextBold->setFont(bold);
    tb->addAction(actionTextBold);
    actionTextBold->setCheckable(true);

    const QIcon italicIcon = QIcon::fromTheme("format-text-italic", QIcon(rsrcPath + "/textitalic.png"));
    actionTextItalic = menu->addAction(italicIcon, tr("&Italic"), this, &TextEdit::textItalic);
    actionTextItalic->setPriority(QAction::LowPriority);
    actionTextItalic->setShortcut(Qt::CTRL + Qt::Key_I);
    QFont italic;
    italic.setItalic(true);
    actionTextItalic->setFont(italic);
    tb->addAction(actionTextItalic);
    actionTextItalic->setCheckable(true);

    const QIcon underlineIcon = QIcon::fromTheme("format-text-underline", QIcon(rsrcPath + "/textunder.png"));
    actionTextUnderline = menu->addAction(underlineIcon, tr("&Underline"), this, &TextEdit::textUnderline);
    actionTextUnderline->setShortcut(Qt::CTRL + Qt::Key_U);
    actionTextUnderline->setPriority(QAction::LowPriority);
    QFont underline;
    underline.setUnderline(true);
    actionTextUnderline->setFont(underline);
    tb->addAction(actionTextUnderline);
    actionTextUnderline->setCheckable(true);

    menu->addSeparator();

    const QIcon leftIcon = QIcon::fromTheme("format-justify-left", QIcon(rsrcPath + "/textleft.png"));
    actionAlignLeft = new QAction(leftIcon, tr("&Left"), this);
    actionAlignLeft->setShortcut(Qt::CTRL + Qt::Key_L);
    actionAlignLeft->setCheckable(true);
    actionAlignLeft->setPriority(QAction::LowPriority);
    const QIcon centerIcon = QIcon::fromTheme("format-justify-center", QIcon(rsrcPath + "/textcenter.png"));
    actionAlignCenter = new QAction(centerIcon, tr("C&enter"), this);
    actionAlignCenter->setShortcut(Qt::CTRL + Qt::Key_E);
    actionAlignCenter->setCheckable(true);
    actionAlignCenter->setPriority(QAction::LowPriority);
    const QIcon rightIcon = QIcon::fromTheme("format-justify-right", QIcon(rsrcPath + "/textright.png"));
    actionAlignRight = new QAction(rightIcon, tr("&Right"), this);
    actionAlignRight->setShortcut(Qt::CTRL + Qt::Key_R);
    actionAlignRight->setCheckable(true);
    actionAlignRight->setPriority(QAction::LowPriority);
    const QIcon fillIcon = QIcon::fromTheme("format-justify-fill", QIcon(rsrcPath + "/textjustify.png"));
    actionAlignJustify = new QAction(fillIcon, tr("&Justify"), this);
    actionAlignJustify->setShortcut(Qt::CTRL + Qt::Key_J);
    actionAlignJustify->setCheckable(true);
    actionAlignJustify->setPriority(QAction::LowPriority);

    // Make sure the alignLeft  is always left of the alignRight
    QActionGroup *alignGroup = new QActionGroup(this);
    connect(alignGroup, &QActionGroup::triggered, this, &TextEdit::textAlign);

    if (QApplication::isLeftToRight()) {
        alignGroup->addAction(actionAlignLeft);
        alignGroup->addAction(actionAlignCenter);
        alignGroup->addAction(actionAlignRight);
    } else {
        alignGroup->addAction(actionAlignRight);
        alignGroup->addAction(actionAlignCenter);
        alignGroup->addAction(actionAlignLeft);
    }
    alignGroup->addAction(actionAlignJustify);

    tb->addActions(alignGroup->actions());
    menu->addActions(alignGroup->actions());

    menu->addSeparator();

    QPixmap pix(16, 16);
    pix.fill(Qt::black);
    actionTextColor = menu->addAction(pix, tr("&Color..."), this, &TextEdit::textColor);
    tb->addAction(actionTextColor);

    tb = addToolBar(tr("Format Actions"));
    tb->setAllowedAreas(Qt::TopToolBarArea | Qt::BottomToolBarArea);
    addToolBarBreak(Qt::TopToolBarArea);
    addToolBar(tb);

    comboStyle = new QComboBox(tb);
    tb->addWidget(comboStyle);
    comboStyle->addItem("Standard");
    comboStyle->addItem("Bullet List (Disc)");
    comboStyle->addItem("Bullet List (Circle)");
    comboStyle->addItem("Bullet List (Square)");
    comboStyle->addItem("Ordered List (Decimal)");
    comboStyle->addItem("Ordered List (Alpha lower)");
    comboStyle->addItem("Ordered List (Alpha upper)");
    comboStyle->addItem("Ordered List (Roman lower)");
    comboStyle->addItem("Ordered List (Roman upper)");

    connect(comboStyle, QOverload<int>::of(&QComboBox::activated), this, &TextEdit::textStyle);

    comboFont = new QFontComboBox(tb);
    tb->addWidget(comboFont);
    connect(comboFont, QOverload<const QString &>::of(&QComboBox::activated), this, &TextEdit::textFamily);

    comboSize = new QComboBox(tb);
    comboSize->setObjectName("comboSize");
    tb->addWidget(comboSize);
    comboSize->setEditable(true);

    const QList<int> standardSizes = QFontDatabase::standardSizes();
    foreach (int size, standardSizes)
        comboSize->addItem(QString::number(size));
    comboSize->setCurrentIndex(standardSizes.indexOf(QApplication::font().pointSize()));

    connect(comboSize, QOverload<const QString &>::of(&QComboBox::activated), this, &TextEdit::textSize);
}

bool TextEdit::load(const QString &f)
{
    if (!QFile::exists(f))
        return false;
    QFile file(f);
    if (!file.open(QFile::ReadOnly))
        return false;

    QByteArray data = file.readAll();
    QTextCodec *codec = Qt::codecForHtml(data);
    QString str = codec->toUnicode(data);
    if (Qt::mightBeRichText(str)) {
        textEdit->setHtml(str);
    } else {
        str = QString::fromLocal8Bit(data);
        textEdit->setPlainText(str);
    }

    setCurrentFileName(f);
    return true;
}

bool TextEdit::maybeSave()
{
    if (!textEdit->document()->isModified())
        return true;

    const QMessageBox::StandardButton ret =
        QMessageBox::warning(this, QCoreApplication::applicationName(),
                             tr("The document has been modified.\n"
                                "Do you want to save your changes?"),
                             QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel);
    if (ret == QMessageBox::Save)
        return fileSave();
    else if (ret == QMessageBox::Cancel)
        return false;
    return true;
}

void TextEdit::setCurrentFileName(const QString &fileName)
{
    this->fileName = fileName;
    textEdit->document()->setModified(false);

    QString shownName;
    if (fileName.isEmpty())
        shownName = "untitled.txt";
    else
        shownName = QFileInfo(fileName).fileName();

    setWindowTitle(tr("%1[*] - %2").arg(shownName, QCoreApplication::applicationName()));
    setWindowModified(false);
}

void TextEdit::fileNew()
{
    if (maybeSave()) {
        textEdit->clear();
        setCurrentFileName(QString());
    }
}

void TextEdit::fileOpen()
{
    QFileDialog fileDialog(this, tr("Open File..."));
    fileDialog.setAcceptMode(QFileDialog::AcceptOpen);
    fileDialog.setFileMode(QFileDialog::ExistingFile);
    fileDialog.setMimeTypeFilters(QStringList() << "text/html" << "text/plain");
    if (fileDialog.exec() != QDialog::Accepted)
        return;
    const QString fn = fileDialog.selectedFiles().first();
    if (load(fn))
        statusBar()->showMessage(tr("Opened \"%1\"").arg(QDir::toNativeSeparators(fn)));
    else
        statusBar()->showMessage(tr("Could not open \"%1\"").arg(QDir::toNativeSeparators(fn)));
}

bool TextEdit::fileSave()
{
    if (fileName.isEmpty())
        return fileSaveAs();
    if (fileName.startsWith(QStringLiteral(":/")))
        return fileSaveAs();

    QTextDocumentWriter writer(fileName);
    bool success = writer.write(textEdit->document());
    if (success) {
        textEdit->document()->setModified(false);
        statusBar()->showMessage(tr("Wrote \"%1\"").arg(QDir::toNativeSeparators(fileName)));
    } else {
        statusBar()->showMessage(tr("Could not write to file \"%1\"")
                                 .arg(QDir::toNativeSeparators(fileName)));
    }
    return success;
}

bool TextEdit::fileSaveAs()
{
    QFileDialog fileDialog(this, tr("Save as..."));
    fileDialog.setAcceptMode(QFileDialog::AcceptSave);
    QStringList mimeTypes;
    mimeTypes << "application/vnd.oasis.opendocument.text" << "text/html" << "text/plain";
    fileDialog.setMimeTypeFilters(mimeTypes);
    fileDialog.setDefaultSuffix("odt");
    if (fileDialog.exec() != QDialog::Accepted)
        return false;
    const QString fn = fileDialog.selectedFiles().first();
    setCurrentFileName(fn);
    return fileSave();
}

void TextEdit::filePrint()
{
#if QT_CONFIG(printdialog)
    QPrinter printer(QPrinter::HighResolution);
    QPrintDialog *dlg = new QPrintDialog(&printer, this);
    if (textEdit->textCursor().hasSelection())
        dlg->addEnabledOption(QAbstractPrintDialog::PrintSelection);
    dlg->setWindowTitle(tr("Print Document"));
    if (dlg->exec() == QDialog::Accepted)
        textEdit->print(&printer);
    delete dlg;
#endif
}

void TextEdit::filePrintPreview()
{
#if QT_CONFIG(printpreviewdialog)
    QPrinter printer(QPrinter::HighResolution);
    QPrintPreviewDialog preview(&printer, this);
    connect(&preview, &QPrintPreviewDialog::paintRequested, this, &TextEdit::printPreview);
    preview.exec();
#endif
}

void TextEdit::printPreview(QPrinter *printer)
{
#ifdef QT_NO_PRINTER
    Q_UNUSED(printer);
#else
    textEdit->print(printer);
#endif
}


void TextEdit::filePrintPdf()
{
#ifndef QT_NO_PRINTER
//! [0]
    QFileDialog fileDialog(this, tr("Export PDF"));
    fileDialog.setAcceptMode(QFileDialog::AcceptSave);
    fileDialog.setMimeTypeFilters(QStringList("application/pdf"));
    fileDialog.setDefaultSuffix("pdf");
    if (fileDialog.exec() != QDialog::Accepted)
        return;
    QString fileName = fileDialog.selectedFiles().first();
    QPrinter printer(QPrinter::HighResolution);
    printer.setOutputFormat(QPrinter::PdfFormat);
    printer.setOutputFileName(fileName);
    textEdit->document()->print(&printer);
    statusBar()->showMessage(tr("Exported \"%1\"")
                             .arg(QDir::toNativeSeparators(fileName)));
//! [0]
#endif
}

void TextEdit::textBold()
{
    QTextCharFormat fmt;
    fmt.setFontWeight(actionTextBold->isChecked() ? QFont::Bold : QFont::Normal);
    mergeFormatOnWordOrSelection(fmt);
}

void TextEdit::textUnderline()
{
    QTextCharFormat fmt;
    fmt.setFontUnderline(actionTextUnderline->isChecked());
    mergeFormatOnWordOrSelection(fmt);
}

void TextEdit::textItalic()
{
    QTextCharFormat fmt;
    fmt.setFontItalic(actionTextItalic->isChecked());
    mergeFormatOnWordOrSelection(fmt);
}

void TextEdit::textFamily(const QString &f)
{
    QTextCharFormat fmt;
    fmt.setFontFamily(f);
    mergeFormatOnWordOrSelection(fmt);
}

void TextEdit::textSize(const QString &p)
{
    qreal pointSize = p.toFloat();
    if (p.toFloat() > 0) {
        QTextCharFormat fmt;
        fmt.setFontPointSize(pointSize);
        mergeFormatOnWordOrSelection(fmt);
    }
}

void TextEdit::textStyle(int styleIndex)
{
    QTextCursor cursor = textEdit->textCursor();

    if (styleIndex != 0) {
        QTextListFormat::Style style = QTextListFormat::ListDisc;

        switch (styleIndex) {
            default:
            case 1:
                style = QTextListFormat::ListDisc;
                break;
            case 2:
                style = QTextListFormat::ListCircle;
                break;
            case 3:
                style = QTextListFormat::ListSquare;
                break;
            case 4:
                style = QTextListFormat::ListDecimal;
                break;
            case 5:
                style = QTextListFormat::ListLowerAlpha;
                break;
            case 6:
                style = QTextListFormat::ListUpperAlpha;
                break;
            case 7:
                style = QTextListFormat::ListLowerRoman;
                break;
            case 8:
                style = QTextListFormat::ListUpperRoman;
                break;
        }

        cursor.beginEditBlock();

        QTextBlockFormat blockFmt = cursor.blockFormat();

        QTextListFormat listFmt;

        if (cursor.currentList()) {
            listFmt = cursor.currentList()->format();
        } else {
            listFmt.setIndent(blockFmt.indent() + 1);
            blockFmt.setIndent(0);
            cursor.setBlockFormat(blockFmt);
        }

        listFmt.setStyle(style);

        cursor.createList(listFmt);

        cursor.endEditBlock();
    } else {
        // ####
        QTextBlockFormat bfmt;
        bfmt.setObjectIndex(-1);
        cursor.mergeBlockFormat(bfmt);
    }
}

void TextEdit::textColor()
{
    QColor col = QColorDialog::getColor(textEdit->textColor(), this);
    if (!col.isValid())
        return;
    QTextCharFormat fmt;
    fmt.setForeground(col);
    mergeFormatOnWordOrSelection(fmt);
    colorChanged(col);
}

void TextEdit::textAlign(QAction *a)
{
    if (a == actionAlignLeft)
        textEdit->setAlignment(Qt::AlignLeft | Qt::AlignAbsolute);
    else if (a == actionAlignCenter)
        textEdit->setAlignment(Qt::AlignHCenter);
    else if (a == actionAlignRight)
        textEdit->setAlignment(Qt::AlignRight | Qt::AlignAbsolute);
    else if (a == actionAlignJustify)
        textEdit->setAlignment(Qt::AlignJustify);
}

void TextEdit::currentCharFormatChanged(const QTextCharFormat &format)
{
    fontChanged(format.font());
    colorChanged(format.foreground().color());
}

void TextEdit::cursorPositionChanged()
{
    alignmentChanged(textEdit->alignment());
}

void TextEdit::clipboardDataChanged()
{
#ifndef QT_NO_CLIPBOARD
    if (const QMimeData *md = QApplication::clipboard()->mimeData())
        actionPaste->setEnabled(md->hasText());
#endif
}

void TextEdit::about()
{
    QMessageBox::about(this, tr("About"), tr("This example demonstrates Qt's "
        "rich text editing facilities in action, providing an example "
        "document for you to experiment with."));
}

void TextEdit::mergeFormatOnWordOrSelection(const QTextCharFormat &format)
{
    QTextCursor cursor = textEdit->textCursor();
    if (!cursor.hasSelection())
        cursor.select(QTextCursor::WordUnderCursor);
    cursor.mergeCharFormat(format);
    textEdit->mergeCurrentCharFormat(format);
}

void TextEdit::fontChanged(const QFont &f)
{
    comboFont->setCurrentIndex(comboFont->findText(QFontInfo(f).family()));
    comboSize->setCurrentIndex(comboSize->findText(QString::number(f.pointSize())));
    actionTextBold->setChecked(f.bold());
    actionTextItalic->setChecked(f.italic());
    actionTextUnderline->setChecked(f.underline());
}

void TextEdit::colorChanged(const QColor &c)
{
    QPixmap pix(16, 16);
    pix.fill(c);
    actionTextColor->setIcon(pix);
}

void TextEdit::alignmentChanged(Qt::Alignment a)
{
    if (a & Qt::AlignLeft)
        actionAlignLeft->setChecked(true);
    else if (a & Qt::AlignHCenter)
        actionAlignCenter->setChecked(true);
    else if (a & Qt::AlignRight)
        actionAlignRight->setChecked(true);
    else if (a & Qt::AlignJustify)
        actionAlignJustify->setChecked(true);
}