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// SPDX-License-Identifier: GPL-2.0-or-later
/** @file
* Creates and maintains display tree needed for text styling.
*/
/*
* This class is used by sp-text and sp-flowtext to maintain the display tree required by the
* patterns and filters of tspans.
*
* The basic lifecycle of the DrawingText objects associated to tspans is that they are created
* in Layout::show(), and destroyed in SP(Flow)Text::_clearFlow(), or at the end of the SP(Flow)Text's
* lifetime by SPItem::release(). They don't need to be maintained during their lifetime; when they
* need to be modified they are simply torn down and recreated.
*
* In order for patterns and filters to be correctly applied to tspans, certain extra pieces of display
* tree must be attached to their DrawingText objects, and unattached at the right time to avoid crashes.
* Normally this is handled by SPItem, however tspans are not SPItems and require their own code for this,
* hence this class.
*
* A StyleAttachments allows creating display tree from a supplied SPFilter or SPPaintServer and
* attaching it to a DrawingText. Upon deletion of the SPFilter/SPPaintServer, a call to unattachAll(),
* or destruction, the display tree is then removed from the DrawingText.
*
* It is used as follows. When a tspan creates a DrawingText, each of the attach*() methods is called at
* most once on it. Then just before the DrawingText is destroyed, unattachAll() or the destructor is called.
*/
#ifndef INKSCAPE_TEXT_STYLEATTACHMENTS_H
#define INKSCAPE_TEXT_STYLEATTACHMENTS_H
#include <vector>
#include <unordered_map>
#include <2geom/rect.h>
#include <sigc++/connection.h>
class SPFilter;
class SPPaintServer;
namespace Inkscape {
class DrawingText;
class DrawingPattern;
namespace Text {
class StyleAttachments
{
public:
void attachFilter(DrawingText *item, SPFilter *filter);
void attachFill(DrawingText *item, SPPaintServer *paintserver, Geom::OptRect const &bbox);
void attachStroke(DrawingText *item, SPPaintServer *paintserver, Geom::OptRect const &bbox);
void unattachAll();
private:
class FilterEntry
{
public:
FilterEntry(SPFilter *filter);
FilterEntry(FilterEntry const &) = delete;
FilterEntry const &operator=(FilterEntry const &) = delete;
~FilterEntry();
void addItem(Inkscape::DrawingText *item);
private:
SPFilter *_filter;
sigc::connection _conn;
std::vector<Inkscape::DrawingText*> _items;
void _removeAllItems();
};
class PatternEntry
{
public:
PatternEntry(SPPaintServer *paintserver);
PatternEntry(PatternEntry const &) = delete;
PatternEntry const &operator=(PatternEntry const &) = delete;
~PatternEntry();
void addFill(Inkscape::DrawingText *item, Geom::OptRect const &bbox);
void addStroke(Inkscape::DrawingText *item, Geom::OptRect const &bbox);
private:
SPPaintServer *_paintserver;
sigc::connection _conn;
std::vector<unsigned> _keys;
void _removeAllItems();
};
std::unordered_map<SPFilter*, FilterEntry> _filters;
std::unordered_map<SPPaintServer*, PatternEntry> _patterns;
};
} // namespace Text
} // namespace Inkscape
#endif // INKSCAPE_TEXT_STYLEATTACHMENTS_H
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8 :
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