context.h

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#ifndef ASW_UI_CONTEXT_H
#define ASW_UI_CONTEXT_H
 
#include <optional>
#include <vector>
 
#include "navigation.h"
#include "theme.h"
#include "widget.h"
 
namespace asw::ui {
 
class FocusManager {
public:
    Widget* focused() const
    {
        return _focused;
    }
 
    void set_focus(Context& ctx, Widget* w);
 
    Widget* default_focus = nullptr;
 
    void focus_next(Context& ctx);
 
    void focus_prev(Context& ctx);
 
    bool focus_start(Context& ctx);
 
    void focus_dir(Context& ctx, int dx, int dy);
 
private:
    friend class Root;
 
    // Rebuild the focusable widget list from the widget tree
    void rebuild(Context& ctx, Widget& root);
 
    void dfs(Widget& w);
 
    std::vector<Widget*> _focusables;
    Widget* _focused = nullptr;
 
    // Whether the last rebuild found the focused widget in the tree
    bool _focused_found = false;
 
    // Across position kept during repeated moves one way
    std::optional<float> _lane_x;
    std::optional<float> _lane_y;
};
 
class Context {
public:
    Context() = default;
 
    Theme theme;
 
    FocusManager focus;
 
    Navigation navigation;
 
    bool show_focus = false;
 
private:
    friend class Root;
 
    // Widget pressed by the pointer, it gets pointer events until release
    Widget* pointer_capture = nullptr;
 
    // Widget under the pointer
    Widget* hover = nullptr;
};
 
} // namespace asw::ui
 
#endif // ASW_UI_CONTEXT_H