svg text object : QImage « Qt « C++

1. C++
2. Qt
3. QImage

svg text object

  

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#ifndef SVGTEXTOBJECT_H
#define SVGTEXTOBJECT_H

#include <QTextObjectInterface>

QT_BEGIN_NAMESPACE
class QTextDocument;
class QTextFormat;
class QPainter;
class QRectF;
class QSizeF;
QT_END_NAMESPACE

 
class SvgTextObject : public QObject, public QTextObjectInterface
{
    Q_OBJECT
    Q_INTERFACES(QTextObjectInterface)


public:        
    QSizeF intrinsicSize(QTextDocument *doc, int posInDocument,
                         const QTextFormat &format);
    void drawObject(QPainter *painter, const QRectF &rect, QTextDocument *doc,
                    int posInDocument, const QTextFormat &format);
};


#endif












#include <QtGui>
#include <QtSvg>

#include "svgtextobject.h"
#include "window.h"


QSizeF SvgTextObject::intrinsicSize(QTextDocument *doc, int posInDocument,
                                    const QTextFormat &format)
{
    QImage bufferedImage = qVariantValue<QImage>(format.property(Window::SvgData));
    QSize size = bufferedImage.size();
    
    if (size.height() > 25)
        size *= 25.0 / (double) size.height();

    return QSizeF(size);
}



void SvgTextObject::drawObject(QPainter *painter, const QRectF &rect,
                               QTextDocument *doc, int posInDocument,
                               const QTextFormat &format)
{
    QImage bufferedImage = qVariantValue<QImage>(format.property(Window::SvgData));

    painter->drawImage(rect, bufferedImage);
}








#ifndef WINDOW_H
#define WINDOW_H

#include <QWidget>
#include <QTextFormat>

QT_BEGIN_NAMESPACE
class QTextEdit;
class QLineEdit;
class QPushButton;
class QLabel;
QT_END_NAMESPACE


class Window : public QWidget
{
    Q_OBJECT

public:
    enum { SvgTextFormat = QTextFormat::UserObject + 1 };
    enum SvgProperties { SvgData = 1 };

    Window();

private slots:
    void insertTextObject();

private:
    void setupTextObject();
    void setupGui();

private:
    QTextEdit *textEdit;
    QLabel *fileNameLabel;
    QLineEdit *fileNameLineEdit;
    QPushButton *insertTextObjectButton;
};


#endif






#include <QtGui>
#include <QtSvg>

#include "window.h"
#include "svgtextobject.h"

Window::Window()
{
    setupGui();
    setupTextObject();

    setWindowTitle("Text Object Example");
}


void Window::insertTextObject()
{
    QString fileName = fileNameLineEdit->text();
    QFile file(fileName);
    if (!file.open(QIODevice::ReadOnly)) {
        QMessageBox::warning(this, tr("Error Opening File"),
                             tr("Could not open '%1'").arg(fileName));
    }

    QByteArray svgData = file.readAll();



    QTextCharFormat svgCharFormat;
    svgCharFormat.setObjectType(SvgTextFormat);
    QSvgRenderer renderer(svgData);

    QImage svgBufferImage(renderer.defaultSize(), QImage::Format_ARGB32);
    QPainter painter(&svgBufferImage);
    renderer.render(&painter, svgBufferImage.rect());

    svgCharFormat.setProperty(SvgData, svgBufferImage);

    QTextCursor cursor = textEdit->textCursor();
    cursor.insertText(QString(QChar::ObjectReplacementCharacter), svgCharFormat);
    textEdit->setTextCursor(cursor);
}



void Window::setupTextObject()
{
    QObject *svgInterface = new SvgTextObject;
    textEdit->document()->documentLayout()->registerHandler(SvgTextFormat, svgInterface);
}


void Window::setupGui()
{
    fileNameLabel = new QLabel(tr("Svg File Name:"));
    fileNameLineEdit = new QLineEdit;
    insertTextObjectButton = new QPushButton(tr("Insert Image"));

    fileNameLineEdit->setText("./files/heart.svg");
    connect(insertTextObjectButton, SIGNAL(clicked()),
            this, SLOT(insertTextObject()));

    QHBoxLayout *bottomLayout = new QHBoxLayout;
    bottomLayout->addWidget(fileNameLabel);
    bottomLayout->addWidget(fileNameLineEdit);
    bottomLayout->addWidget(insertTextObjectButton);

    textEdit = new QTextEdit;

    QVBoxLayout *mainLayout = new QVBoxLayout;
    mainLayout->addWidget(textEdit);
    mainLayout->addLayout(bottomLayout);

    setLayout(mainLayout);
}







#include <QtGui>

#include "window.h"

int main(int argv, char **args)
{
    QApplication app(argv, args);

    Window window;
    window.show();

    return app.exec();
}

   
    
  

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