QTextEidt添加图片 拖动图片

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

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

QTextEdit *textEditor = new QTextEdit(0);

QTextDocumentFragment fragment;

fragment = QTextDocumentFragment::fromHtml("<imgsrc='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());

}

};