QScintilla C++-Beispiel

Qt

Leider habe ich völlig aus meinem Gedächtnis gelöscht, wie ich das Verteilungspaket erhalten habe (es war vor drei Jahren, und dann bin ich nicht mehr auf dieses Thema zurückgekommen). Hier muss man das Internet gründlich durchforsten. Sie können diese Ressource ausprobieren: https://github.com/brCreate/QScintilla Daher gebe ich in den Kommentaren einfach den Code mit einigen Erklärungen.

Das Endergebnis sollte ungefähr so aussehen.

application.pro

CONFIG      += qscintilla2

TARGET = MyQScintillaApplication

HEADERS      = mainwindow.h
SOURCES      = main.cpp mainwindow.cpp
RESOURCES    = application.qrc

application.qrc

<!DOCTYPE RCC><RCC version="1.0">
<qresource>
    <file>images/copy.png</file>
    <file>images/cut.png</file>
    <file>images/new.png</file>
    <file>images/open.png</file>
    <file>images/paste.png</file>
    <file>images/save.png</file>
</qresource>
</RCC>

main.cpp

#include <QApplication>

#include "mainwindow.h"

int main(int argc, char *argv[])
{
    Q_INIT_RESOURCE(application);

    QApplication app(argc, argv);
    MainWindow mainWin;
    mainWin.show();
    return app.exec();
}

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

class QAction;
class QMenu;
class QsciScintilla;

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow();

protected:
    void closeEvent(QCloseEvent *event);

private slots:
    void newFile();
    void open();
    bool save();
    bool saveAs();
    void about();
    void documentWasModified();

private:
    void createActions();
    void createMenus();
    void createToolBars();
    void createStatusBar();
    void readSettings();
    void writeSettings();
    bool maybeSave();
    void loadFile(const QString &fileName);
    bool saveFile(const QString &fileName);
    void setCurrentFile(const QString &fileName);
    QString strippedName(const QString &fullFileName);

    QsciScintilla *textEdit;
    QString curFile;

    QMenu *fileMenu;
    QMenu *editMenu;
    QMenu *helpMenu;
    QToolBar *fileToolBar;
    QToolBar *editToolBar;
    QAction *newAct;
    QAction *openAct;
    QAction *saveAct;
    QAction *saveAsAct;
    QAction *exitAct;
    QAction *cutAct;
    QAction *copyAct;
    QAction *pasteAct;
    QAction *aboutAct;
    QAction *aboutQtAct;
};

#endif

mainwindow.cpp

#include <QAction>
#include <QApplication>
#include <QCloseEvent>
#include <QFile>
#include <QFileInfo>
#include <QFileDialog>
#include <QIcon>
#include <QMenu>
#include <QMenuBar>
#include <QMessageBox>
#include <QPoint>
#include <QSettings>
#include <QSize>
#include <QStatusBar>
#include <QTextStream>
#include <QToolBar>

#include <Qsci/qsciscintilla.h>
#include <Qsci/qscistyle.h>
#include <Qsci/qscilexercpp.h>

#include "mainwindow.h"

MainWindow::MainWindow()
{
    textEdit = new QsciScintilla;
    setCentralWidget(textEdit);

    createActions();
    createMenus();
    createToolBars();
    createStatusBar();

    readSettings();

    connect(textEdit, SIGNAL(textChanged()), this, SLOT(documentWasModified()));

    setCurrentFile("");

    textEdit->append("Append text");
    textEdit->setUtf8(true);

    //! Текущая строка кода и ее подсветка
    textEdit->setCaretLineVisible(true);
    textEdit->setCaretLineBackgroundColor(QColor("yellow"));

    //! Выравнивание
    textEdit->setAutoIndent(true);
    textEdit->setIndentationGuides(false);
    textEdit->setIndentationsUseTabs(true);
    textEdit->setIndentationWidth(4);

    //! margin это полоска слева, на которой обычно располагаются breakpoints
    textEdit->setMarginsBackgroundColor(QColor("gainsboro"));
    textEdit->setMarginLineNumbers(1, true);
    textEdit->setMarginWidth(1, 50);

    //! Авто-дополнение кода в зависимости от источника
    textEdit->setAutoCompletionSource(QsciScintilla::AcsAll);
    textEdit->setAutoCompletionCaseSensitivity(true);
    textEdit->setAutoCompletionReplaceWord(true);
    textEdit->setAutoCompletionUseSingle(QsciScintilla::AcusAlways);
    textEdit->setAutoCompletionThreshold(0);

    //! Подсветка соответствий скобок
    textEdit->setBraceMatching(QsciScintilla::SloppyBraceMatch);
    textEdit->setMatchedBraceBackgroundColor(Qt::yellow);
    textEdit->setUnmatchedBraceForegroundColor(Qt::blue);

    //! Линия ограничения кода
    textEdit->setEdgeColor(Qt::green);
    textEdit->setEdgeColumn(80);
    textEdit->setEdgeMode(QsciScintilla::EdgeMode::EdgeLine);

    //! Установки текстового редактора
    textEdit->setColor(Qt::green);
    textEdit->setFont(QFont("Verdana"));
    textEdit->setPaper(Qt::black);
    textEdit->setWhitespaceForegroundColor(Qt::white);
    textEdit->setWhitespaceVisibility(QsciScintilla::WhitespaceVisibility::WsVisible);
}

void MainWindow::closeEvent(QCloseEvent *event)
{
    if (maybeSave()) {
        writeSettings();
        event->accept();
    } else {
        event->ignore();
    }
}

void MainWindow::newFile()
{
    if (maybeSave()) {
        textEdit->clear();
        setCurrentFile("");
    }
}

void MainWindow::open()
{
    if (maybeSave()) {
        QString fileName = QFileDialog::getOpenFileName(this);
        if (!fileName.isEmpty())
            loadFile(fileName);
    }
}

bool MainWindow::save()
{
    if (curFile.isEmpty()) {
        return saveAs();
    } else {
        return saveFile(curFile);
    }
}

bool MainWindow::saveAs()
{
    QString fileName = QFileDialog::getSaveFileName(this);
    if (fileName.isEmpty())
        return false;

    return saveFile(fileName);
}

void MainWindow::about()
{
   QMessageBox::about(this, tr("About Application"),
            tr("The <b>Application</b> example demonstrates how to "
               "write modern GUI applications using Qt, with a menu bar, "
               "toolbars, and a status bar."));
}

void MainWindow::documentWasModified()
{
    setWindowModified(textEdit->isModified());
}

void MainWindow::createActions()
{
    newAct = new QAction(QIcon(":/images/new.png"), tr("&New"), this);
    newAct->setShortcut(tr("Ctrl+N"));
    newAct->setStatusTip(tr("Create a new file"));
    connect(newAct, SIGNAL(triggered()), this, SLOT(newFile()));

    openAct = new QAction(QIcon(":/images/open.png"), tr("&Open..."), this);
    openAct->setShortcut(tr("Ctrl+O"));
    openAct->setStatusTip(tr("Open an existing file"));
    connect(openAct, SIGNAL(triggered()), this, SLOT(open()));

    saveAct = new QAction(QIcon(":/images/save.png"), tr("&Save"), this);
    saveAct->setShortcut(tr("Ctrl+S"));
    saveAct->setStatusTip(tr("Save the document to disk"));
    connect(saveAct, SIGNAL(triggered()), this, SLOT(save()));

    saveAsAct = new QAction(tr("Save &As..."), this);
    saveAsAct->setStatusTip(tr("Save the document under a new name"));
    connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));

    exitAct = new QAction(tr("E&xit"), this);
    exitAct->setShortcut(tr("Ctrl+Q"));
    exitAct->setStatusTip(tr("Exit the application"));
    connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

    cutAct = new QAction(QIcon(":/images/cut.png"), tr("Cu&t"), this);
    cutAct->setShortcut(tr("Ctrl+X"));
    cutAct->setStatusTip(tr("Cut the current selection's contents to the "
                            "clipboard"));
    connect(cutAct, SIGNAL(triggered()), textEdit, SLOT(cut()));

    copyAct = new QAction(QIcon(":/images/copy.png"), tr("&Copy"), this);
    copyAct->setShortcut(tr("Ctrl+C"));
    copyAct->setStatusTip(tr("Copy the current selection's contents to the "
                             "clipboard"));
    connect(copyAct, SIGNAL(triggered()), textEdit, SLOT(copy()));

    pasteAct = new QAction(QIcon(":/images/paste.png"), tr("&Paste"), this);
    pasteAct->setShortcut(tr("Ctrl+V"));
    pasteAct->setStatusTip(tr("Paste the clipboard's contents into the current "
                              "selection"));
    connect(pasteAct, SIGNAL(triggered()), textEdit, SLOT(paste()));

    aboutAct = new QAction(tr("&About"), this);
    aboutAct->setStatusTip(tr("Show the application's About box"));
    connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));

    aboutQtAct = new QAction(tr("About &Qt"), this);
    aboutQtAct->setStatusTip(tr("Show the Qt library's About box"));
    connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));

    cutAct->setEnabled(false);
    copyAct->setEnabled(false);
    connect(textEdit, SIGNAL(copyAvailable(bool)), cutAct, SLOT(setEnabled(bool)));
    connect(textEdit, SIGNAL(copyAvailable(bool)), copyAct, SLOT(setEnabled(bool)));
}

void MainWindow::createMenus()
{
    fileMenu = menuBar()->addMenu(tr("&File"));
    fileMenu->addAction(newAct);
    fileMenu->addAction(openAct);
    fileMenu->addAction(saveAct);
    fileMenu->addAction(saveAsAct);
    fileMenu->addSeparator();
    fileMenu->addAction(exitAct);

    editMenu = menuBar()->addMenu(tr("&Edit"));
    editMenu->addAction(cutAct);
    editMenu->addAction(copyAct);
    editMenu->addAction(pasteAct);

    menuBar()->addSeparator();

    helpMenu = menuBar()->addMenu(tr("&Help"));
    helpMenu->addAction(aboutAct);
    helpMenu->addAction(aboutQtAct);
}

void MainWindow::createToolBars()
{
    fileToolBar = addToolBar(tr("File"));
    fileToolBar->addAction(newAct);
    fileToolBar->addAction(openAct);
    fileToolBar->addAction(saveAct);

    editToolBar = addToolBar(tr("Edit"));
    editToolBar->addAction(cutAct);
    editToolBar->addAction(copyAct);
    editToolBar->addAction(pasteAct);
}

void MainWindow::createStatusBar()
{
    statusBar()->showMessage(tr("Ready"));
}

void MainWindow::readSettings()
{
    QSettings settings("Trolltech", "Application Example");
    QPoint pos = settings.value("pos", QPoint(200, 200)).toPoint();
    QSize size = settings.value("size", QSize(400, 400)).toSize();
    resize(size);
    move(pos);
}

void MainWindow::writeSettings()
{
    QSettings settings("Trolltech", "Application Example");
    settings.setValue("pos", pos());
    settings.setValue("size", size());
}

bool MainWindow::maybeSave()
{
    if (textEdit->isModified()) {
        int ret = QMessageBox::warning(this, tr("Application"),
                     tr("The document has been modified.\n"
                        "Do you want to save your changes?"),
                     QMessageBox::Yes | QMessageBox::Default,
                     QMessageBox::No,
                     QMessageBox::Cancel | QMessageBox::Escape);
        if (ret == QMessageBox::Yes)
            return save();
        else if (ret == QMessageBox::Cancel)
            return false;
    }
    return true;
}

void MainWindow::loadFile(const QString &fileName)
{
    QFile file(fileName);
    if (!file.open(QFile::ReadOnly)) {
        QMessageBox::warning(this, tr("Application"),
                             tr("Cannot read file %1:\n%2.")
                             .arg(fileName)
                             .arg(file.errorString()));
        return;
    }

    QTextStream in(&file);
    QApplication::setOverrideCursor(Qt::WaitCursor);
    textEdit->setText(in.readAll());
    QApplication::restoreOverrideCursor();

    setCurrentFile(fileName);
    statusBar()->showMessage(tr("File loaded"), 2000);
}

bool MainWindow::saveFile(const QString &fileName)
{
    QFile file(fileName);
    if (!file.open(QFile::WriteOnly)) {
        QMessageBox::warning(this, tr("Application"),
                             tr("Cannot write file %1:\n%2.")
                             .arg(fileName)
                             .arg(file.errorString()));
        return false;
    }

    QTextStream out(&file);
    QApplication::setOverrideCursor(Qt::WaitCursor);
    out << textEdit->text();
    QApplication::restoreOverrideCursor();

    setCurrentFile(fileName);
    statusBar()->showMessage(tr("File saved"), 2000);
    return true;
}

void MainWindow::setCurrentFile(const QString &fileName)
{
    curFile = fileName;
    textEdit->setModified(false);
    setWindowModified(false);

    QString shownName;
    if (curFile.isEmpty())
        shownName = "untitled.txt";
    else
        shownName = strippedName(curFile);

    setWindowTitle(tr("%1[*] - %2").arg(shownName).arg(tr("Application")));
}

QString MainWindow::strippedName(const QString &fullFileName)
{
    return QFileInfo(fullFileName).fileName();
}