QTextEdit 当中添加图片的几种方式

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 :).

QTextEdit 当中添加图片的几种方式

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