AdventuresInLestoria/Crawler/ScrollableWindowComponent.h

#pragma once
#include "Menu.h"
#include "MenuComponent.h"
#include "Crawler.h"

class ScrollableWindowComponent:public MenuComponent{
protected:
    Renderable r;
    std::vector<MenuComponent*>components;
    vf2d scrollOffset{};
    geom2d::rect<float>bounds; //It's for the scrollbar.
private:
    inline bool OnScreen(MenuComponent*component){
        return geom2d::overlaps(rect,geom2d::rect<float>{component->rect.pos+scrollOffset,component->rect.size});
    }
public:
    inline ScrollableWindowComponent(MenuType parent,geom2d::rect<float>rect,Decal*icon,MenuFunc onClick)
        :MenuComponent(parent,rect,"",onClick,false){
        r.Create(rect.size.x,rect.size.y);
    }
protected:
    virtual inline void Update(Crawler*game)override{
	    MenuComponent::Update(game);

        if(game->GetMouseWheel()!=0){
            if(game->GetMouseWheel()>0){
                scrollOffset.y+="ThemeGlobal.MenuScrollWheelSpeed"_I;
            }else{
                scrollOffset.y-="ThemeGlobal.MenuScrollWheelSpeed"_I;
            }
        }

        for(MenuComponent*component:components){
            component->disabled=!OnScreen(component);
            component->_Update(game);
        }
    }
    virtual inline void Draw(Crawler*game,vf2d parentPos,bool focused)override{
	    MenuComponent::Draw(game,parentPos,focused);
        Sprite*prevDrawTarget=game->GetDrawTarget();
        game->SetDrawTarget(r.Sprite());
        game->Clear(BLANK);
        for(MenuComponent*component:components){
            component->_Draw(game,scrollOffset,focused);
        }
        game->SetDrawTarget(prevDrawTarget);
        game->DrawSprite(parentPos,r.Sprite());
    }
    virtual inline void DrawDecal(Crawler*game,vf2d parentPos,bool focused)override{
	    MenuComponent::DrawDecal(game,parentPos,focused);
        game->DrawRectDecal(parentPos,rect.size);
        for(MenuComponent*component:components){
            component->_DrawDecal(game,parentPos+scrollOffset,focused);
        }
    }
    virtual bool GetHoverState(Crawler*game,MenuComponent*child)override{
		return geom2d::overlaps(geom2d::rect<float>{Menu::menus[parentMenu]->pos+child->rect.pos+scrollOffset,child->rect.size},game->GetMousePos());
    }
public:
    void inline AddComponent(Menu*parentMenu,std::string key,MenuComponent*button){
        components.push_back(button);
        button->renderInMain=false; //Now we are in control!
        button->parentComponent=this;

        if(button->rect.pos.x<bounds.pos.x){
            float sizeIncrease=bounds.pos.x-button->rect.pos.x;
            bounds.size.x+=sizeIncrease;
            bounds.pos.x=button->rect.pos.x;
        }
        if(button->rect.right().start.x>bounds.right().start.x){
            float sizeIncrease=button->rect.right().start.x-bounds.right().start.x;
            bounds.size.x+=sizeIncrease;
        }
        if(button->rect.pos.y<bounds.pos.y){
            float sizeIncrease=bounds.pos.y-button->rect.pos.y;
            bounds.size.y+=sizeIncrease;
            bounds.pos.y=button->rect.pos.y;
        }
        if(button->rect.bottom().start.y>bounds.bottom().start.y){
            float sizeIncrease=button->rect.bottom().start.y-bounds.bottom().start.y;
            bounds.size.y+=sizeIncrease;
        }

        parentMenu->AddComponent(key,button);
    }
    virtual inline bool PointWithinParent(MenuComponent*child,vi2d drawPos)override{
        return geom2d::overlaps(geom2d::rect<float>{Menu::menus[parentMenu]->pos+rect.pos,rect.size},drawPos);
    }
};