使用QTextEdit建立一個簡單地文本編譯器,可以實作文字和圖檔的混編。
插入文字當然沒什麼問題,QTextEdit也直接可以複制粘貼文字。但是對于插入圖檔怎麼辦呢?
方案一:單擊一個按鈕,選擇一張圖檔,将圖檔插入到光标位置。
void QcTextEdit::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 url ( QString ( "file://%1" ).arg ( file ) );
QImage image = QImageReader ( file ).read();
QTextDocument * textDocument = m_textEdit->document();
textDocument->addResource( QTextDocument::ImageResource, url, QVariant ( image ) );
QTextCursor cursor = m_textEdit->textCursor();
QTextImageFormat imageFormat;
imageFormat.setWidth( image.width() );
imageFormat.setHeight( image.height() );
imageFormat.setName( url.toString() );
cursor.insertImage(imageFormat);
}
方案二:第一種方法,能達到要求,不過不夠友善,隻能單擊選擇圖檔,有沒有可以複制粘貼或者直接拖圖檔就能插入呢?
bool QcTextEdit::canInsertFromMimeData(const QMimeData *source) const
{
return source->hasImage() || source->hasUrls() ||
QTextEdit::canInsertFromMimeData(source);
}
void QcTextEdit::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);
}
}
void QcTextEdit::dropImage(const QUrl &url, const QImage &image)
{
if (!image.isNull()) {
document()->addResource(QTextDocument::ImageResource, url, image);
textCursor().insertImage(url.toString());
}
}
void QcTextEdit::dropTextFile(const QUrl &url)
{
QFile file(url.toLocalFile());
if (file.open(QIODevice::ReadOnly | QIODevice::Text))
textCursor().insertText(file.readAll());
}