spk_scalable_widget.hpp

#pragma once
 
#include "structure/graphics/spk_extend_2d.hpp"
#include "structure/widget/spk_widget.hpp"
 
namespace spk
{
    class ScalableWidget : public spk::Widget
    {
    private:
        class InnerBehavior : public spk::Widget
        {
        private:
            enum Edge : uint8_t
            {
                None = 0,
                Left = 1,
                Right = 2,
                Top = 4,
                Bottom = 8
            };
 
            uint8_t _activeEdges = Edge::None;
 
            spk::Extend2D _baseGeometry;
            spk::Vector2Int _positionDelta;
 
            spk::Extend2D _topAnchorArea;
            spk::Extend2D _leftAnchorArea;
            spk::Extend2D _rightAnchorArea;
            spk::Extend2D _downAnchorArea;
 
            uint8_t _hoverEdges(const spk::Vector2Int &p_mousePos) const;
            void _setCursorForEdges(uint8_t p_edges);
            spk::Extend2D _computeResizedGeometry(const spk::Vector2Int &p_currentPos) const;
            void _beginResize(uint8_t p_edges, const spk::Vector2Int &p_startPos);
            void _endResize();
 
            void _onMousePressEvent(spk::MousePressEvent &p_event) override;
            void _onMouseMotionEvent(spk::MouseMotionEvent &p_event) override;
            void _onMouseReleaseEvent(spk::MouseReleaseEvent &p_event) override;
 
        public:
            InnerBehavior(const std::wstring &p_name, Widget *p_parent);
 
            void setAnchorArea(const spk::Extend2D &p_extend2D);
        };
 
        InnerBehavior _resizeBehavior;
 
    public:
        ScalableWidget(const std::wstring &p_name, Widget *p_parent);

        void setGeometry(const spk::Extend2D &p_extend2D) override;
    };
}