QTextEdit 添加图片

Qt TextEdit 中添加图片的几种方法（转）  

2011-07-24 21:23:44|  分类： QT |  标签： |字号大中小 订阅

 

 

http://stackoverflow.com/questions/3254652/several-ways-of-placing-an-image-in-a-qtextedit

（1）I  think this is a very simple question, but when I copy an image I can't paste it in a QTextEdit? Paste is inactive! Also I would like to know how to drag-and-drop a picture.

BTW I use the following code in order to insert a picture into a QTextEdit:

 

            QTextEdit *textEditor = new QTextEdit(0); 
            QTextDocumentFragment fragment; 
            fragment = QTextDocumentFragment::fromHtml("<img src='C:\\aaa.jpg'>"); 
           textEditor->textCursor().insertFragment(fragment); 
           textEditor->setVisible(true); 
（2）

void TextEdit::insertImage() 
{ 
    QString file = QFileDialog::getOpenFileName(this, tr("Select an image"), 
                                  ".", tr("Bitmap Files (*.bmp)\n" 
                                    "JPEG (*.jpg *jpeg)\n" 
                                    "GIF (*.gif)\n" 
                                    "PNG (*.png)\n")); 
    QUrl Uri ( QString ( "file://%1" ).arg ( file ) ); 
    QImage image = QImageReader ( file ).read(); 
 
    QTextDocument * textDocument = m_textEdit->document(); 
    textDocument->addResource( QTextDocument::ImageResource, Uri, QVariant ( image ) ); 
    QTextCursor cursor = m_textEdit->textCursor(); 
    QTextImageFormat imageFormat; 
    imageFormat.setWidth( image.width() ); 
    imageFormat.setHeight( image.height() ); 
    imageFormat.setName( Uri.toString() ); 
    cursor.insertImage(imageFormat); 
 } 

（3）
The third way is to inherit QTextEdit and reimplement bool canInsertFromMimeData(const QMimeData* source) const and void insertFromMimeData(const QMimeData* source) functions as followes. Buy the way this method allows to use drag-and-drop or copy-paste mechanisms.
class TextEdit : public QTextEdit 
{ 
public: 
    bool canInsertFromMimeData(const QMimeData* source) const 
    { 
        return source->hasImage() || source->hasUrls() || 
            QTextEdit::canInsertFromMimeData(source); 
    } 
 
    void insertFromMimeData(const QMimeData* source) 
    { 
        if (source->hasImage()) 
        { 
            static int i = 1; 
            QUrl url(QString("dropped_image_%1").arg(i++)); 
            dropImage(url, qvariant_cast<QImage>(source->imageData())); 
        } 
        else if (source->hasUrls()) 
        { 
            foreach (QUrl url, source->urls()) 
            { 
                QFileInfo info(url.toLocalFile()); 
                if (QImageReader::supportedImageFormats().contains(info.suffix().toLower().toLatin1())) 
                    dropImage(url, QImage(info.filePath())); 
                else 
                    dropTextFile(url); 
            } 
        } 
        else 
        { 
            QTextEdit::insertFromMimeData(source); 
        } 
    } 
 
private: 
    void dropImage(const QUrl& url, const QImage& image) 
    { 
        if (!image.isNull()) 
        { 
            document()->addResource(QTextDocument::ImageResource, url, image); 
            textCursor().insertImage(url.toString()); 
        } 
    } 
 
    void dropTextFile(const QUrl& url) 
    { 
        QFile file(url.toLocalFile()); 
        if (file.open(QIODevice::ReadOnly | QIODevice::Text)) 
            textCursor().insertText(file.readAll()); 
    } 
}; 
 
Just wanted to share what I find during long investigation :).
转的别人的 第二种试过了，可以用