QTextObjectInterface露

PyQt5.QtGui.QTextObjectInterface

Description露

The QTextObjectInterface class allows drawing of custom text objects in QTextDocuments.

A text object describes the structure of one or more elements in a text document; for instance, images imported from HTML are implemented using text objects. A text object knows how to lay out and draw its elements when a document is being rendered.

Qt allows custom text objects to be inserted into a document by registering a custom object type with QTextCharFormat. A QTextObjectInterface must also be implemented for this type and be registerHandler() with the QAbstractTextDocumentLayout of the document. When the object type is encountered while rendering a QTextDocument, the intrinsicSize() and drawObject() functions of the interface are called.

The following list explains the required steps of inserting a custom text object into a document:

Choose an objectType. The objectType is an integer with a value greater or equal to UserObject.
Create a QTextCharFormat object and set the object type to the chosen type using the setObjectType() function.
Implement the QTextObjectInterface class.
Call registerHandler() with an instance of your QTextObjectInterface subclass to register your object type.
Insert QChar::ObjectReplacementCharacter with the aforementioned QTextCharFormat of the chosen object type into the document. As mentioned, the functions of QTextObjectInterface intrinsicSize() and drawObject() will then be called with the QTextFormat as parameter whenever the replacement character is encountered.

A class implementing a text object needs to inherit both QObject and QTextObjectInterface. QObject must be the first class inherited. For instance:

# class SvgTextObject : public QObject, public QTextObjectInterface
# {
#     Q_OBJECT
#     Q_INTERFACES(QTextObjectInterface)

The data of a text object is usually stored in the QTextCharFormat using QTextCharFormat::setProperty(), and then retrieved with QTextCharFormat::property().

Warning: Copy and Paste operations ignore custom text objects.

Methods露

__init__(): TODO

__init__(QTextObjectInterface): TODO

drawObject(QPainter, QRectF, QTextDocument, int, QTextFormat): TODO

intrinsicSize(QTextDocument, int, QTextFormat) → QSizeF: TODO