qt剪贴板

全局剪贴板

剪贴板数据更新时发送信号

[signal] void QClipboard::dataChanged();

获取剪贴板数据

const QMimeData *mimeData(QClipboard::Mode mode = Clipboard) const;
//
QApplication::clipboard()->mimeData();

设置剪贴板数据

void setMimeData(QMimeData *src, QClipboard::Mode mode = Clipboard);
//
QApplication::clipboard()->setMimeData(mimedata);

QMimeData

QMimeData 存储剪贴板数据

通常由对象 QDrag 和 QClipboard 使用

Tester	Getter	Setter	MIME Types
hasText()	text()	setText()	text/plain
hasHtml()	html()	setHtml()	text/html
hasUrls()	urls()	setUrls()	text/uri-list
hasImage()	imageData()	setImageData()	image/ *
hasColor()	colorData()	setColorData()	application/x-color

example

void MyWidget::dragEnterEvent(QDragEnterEvent *event)
{
    if (event->mimeData()->hasUrls())
        event->acceptProposedAction();
}

void MyWidget::dropEvent(QDropEvent *event)
{
    if (event->mimeData()->hasUrls()) {
        foreach (QUrl url, event->mimeData()->urls()) {
            ...
        }
    }
}

存储自定义数据

1. Custom data can be stored directly in a QMimeData object as a QByteArray using setData(). For example:

   QByteArray csvData = ...;
   QMimeData *mimeData = new QMimeData;
   mimeData->setData("text/csv", csvData);

2. We can subclass QMimeData and reimplement hasFormat(), formats(), and retrieveData().

3. If the drag and drop operation occurs within a single application, we can subclass QMimeData and add extra data in it, and use a qobject_cast() in the receiver’s drop event handler.

   For example:

   void MyWidget::dropEvent(QDropEvent *event)
   {
       const MyMimeData *myData =
       qobject_cast<const MyMimeData *>(event->mimeData());
       if (myData) {
       // access myData's data directly (not through QMimeData's API)
       }
   }

QTextEdit

文本输入框的粘贴

1. 重写该函数，返回值决定是否允许粘贴

   [virtual protected] bool QTextEdit::canInsertFromMimeData(const QMimeData *source) const

2. 重写该函数，自定义粘贴

   [virtual protected] void QTextEdit::insertFromMimeData(const QMimeData *source)