stores.h

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2022 PBS <pbs3141@gmail.com>
 * Released under GNU GPL v2+, read the file 'COPYING' for more information.
 */
 
#ifndef INKSCAPE_UI_WIDGET_CANVAS_STORES_H
#define INKSCAPE_UI_WIDGET_CANVAS_STORES_H
 
#include "fragment.h"
#include "util.h"
#include "ui/util.h"
 
namespace Inkscape::UI::Widget {
 
struct Fragment;
class Prefs;
class Graphics;
 
class Stores
{
public:
    enum class Mode
    {
        None,     
        Normal,   
        Decoupled 
    };
 
    enum class Action
    {
        None,      
        Recreated, 
        Shifted    
    };
    
    struct Store : Fragment
    {
        Cairo::RefPtr<Cairo::Region> drawn;
    };
 
    Stores(Prefs const &prefs)
        : _mode(Mode::None)
        , _graphics(nullptr)
        , _prefs(prefs) {}
 
    void set_graphics(Graphics *g) { _graphics = g; }
 
    void reset();
 
    Action update(Fragment const &view);
 
    Action finished_draw(Fragment const &view);
 
    void mark_drawn(Geom::IntRect const &rect) { _store.drawn->do_union(geom_to_cairo(rect)); }
 
    // Getters.
    Store const &store() const { return _store; }
    Store const &snapshot() const { return _snapshot; }
    Mode mode() const { return _mode; }
 
private:
    // Internal state.
    Mode _mode;
    Store _store, _snapshot;
 
    // The graphics object that executes the operations on the stores.
    Graphics *_graphics;
 
    // The preferences object we read preferences from.
    Prefs const &_prefs;
 
    // Internal actions.
    Geom::IntRect centered(Fragment const &view) const;
    void recreate_store(Fragment const &view);
    void shift_store(Fragment const &view);
    void take_snapshot(Fragment const &view);
    void snapshot_combine(Fragment const &view);
};
 
} // namespace Inkscape::UI::Widget
 
#endif // INKSCAPE_UI_WIDGET_CANVAS_STORES_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 :