qabstracttextdocumentlayout.h
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上传日期:2022-06-22
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- /****************************************************************************
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- ** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
- ** Contact: Qt Software Information (qt-info@nokia.com)
- **
- ** This file is part of the QtGui module of the Qt Toolkit.
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- ** GNU General Public License Usage
- ** Alternatively, this file may be used under the terms of the GNU
- ** General Public License versions 2.0 or 3.0 as published by the Free
- ** Software Foundation and appearing in the file LICENSE.GPL included in
- ** the packaging of this file. Please review the following information
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- #ifndef QABSTRACTTEXTDOCUMENTLAYOUT_H
- #define QABSTRACTTEXTDOCUMENTLAYOUT_H
- #include <QtCore/qobject.h>
- #include <QtGui/qtextlayout.h>
- #include <QtGui/qtextdocument.h>
- #include <QtGui/qtextcursor.h>
- #include <QtGui/qpalette.h>
- QT_BEGIN_HEADER
- QT_BEGIN_NAMESPACE
- QT_MODULE(Gui)
- class QAbstractTextDocumentLayoutPrivate;
- class QTextBlock;
- class QTextObjectInterface;
- class QTextFrame;
- class Q_GUI_EXPORT QAbstractTextDocumentLayout : public QObject
- {
- Q_OBJECT
- Q_DECLARE_PRIVATE(QAbstractTextDocumentLayout)
- public:
- explicit QAbstractTextDocumentLayout(QTextDocument *doc);
- ~QAbstractTextDocumentLayout();
- struct Selection
- {
- QTextCursor cursor;
- QTextCharFormat format;
- };
- struct PaintContext
- {
- PaintContext()
- : cursorPosition(-1)
- {}
- int cursorPosition;
- QPalette palette;
- QRectF clip;
- QVector<Selection> selections;
- };
- virtual void draw(QPainter *painter, const PaintContext &context) = 0;
- virtual int hitTest(const QPointF &point, Qt::HitTestAccuracy accuracy) const = 0;
- QString anchorAt(const QPointF& pos) const;
- virtual int pageCount() const = 0;
- virtual QSizeF documentSize() const = 0;
- virtual QRectF frameBoundingRect(QTextFrame *frame) const = 0;
- virtual QRectF blockBoundingRect(const QTextBlock &block) const = 0;
- void setPaintDevice(QPaintDevice *device);
- QPaintDevice *paintDevice() const;
- QTextDocument *document() const;
- void registerHandler(int objectType, QObject *component);
- QTextObjectInterface *handlerForObject(int objectType) const;
- Q_SIGNALS:
- void update(const QRectF & = QRectF(0., 0., 1000000000., 1000000000.));
- void updateBlock(const QTextBlock &block);
- void documentSizeChanged(const QSizeF &newSize);
- void pageCountChanged(int newPages);
- protected:
- QAbstractTextDocumentLayout(QAbstractTextDocumentLayoutPrivate &, QTextDocument *);
- virtual void documentChanged(int from, int charsRemoved, int charsAdded) = 0;
- virtual void resizeInlineObject(QTextInlineObject item, int posInDocument, const QTextFormat &format);
- virtual void positionInlineObject(QTextInlineObject item, int posInDocument, const QTextFormat &format);
- virtual void drawInlineObject(QPainter *painter, const QRectF &rect, QTextInlineObject object, int posInDocument, const QTextFormat &format);
- int formatIndex(int pos);
- QTextCharFormat format(int pos);
- private:
- friend class QTextDocument;
- friend class QTextDocumentPrivate;
- friend class QTextEngine;
- friend class QTextLayout;
- friend class QTextLine;
- Q_PRIVATE_SLOT(d_func(), void _q_handlerDestroyed(QObject *obj))
- Q_PRIVATE_SLOT(d_func(), int _q_dynamicPageCountSlot())
- Q_PRIVATE_SLOT(d_func(), QSizeF _q_dynamicDocumentSizeSlot())
- };
- class Q_GUI_EXPORT QTextObjectInterface
- {
- public:
- virtual ~QTextObjectInterface() {}
- virtual QSizeF intrinsicSize(QTextDocument *doc, int posInDocument, const QTextFormat &format) = 0;
- virtual void drawObject(QPainter *painter, const QRectF &rect, QTextDocument *doc, int posInDocument, const QTextFormat &format) = 0;
- };
- Q_DECLARE_INTERFACE(QTextObjectInterface, "com.trolltech.Qt.QTextObjectInterface")
- QT_END_NAMESPACE
- QT_END_HEADER
- #endif // QABSTRACTTEXTDOCUMENTLAYOUT_H