Window.hpp

/*
Copyright (C) 2019,2020,2023,2025,2026 Rodrigo Jose Hernandez Cordoba
 
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
 
http://www.apache.org/licenses/LICENSE-2.0
 
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#ifndef AEONGUI_WINDOW_H
#define AEONGUI_WINDOW_H
#include <cstdint>
#include <array>
#include <memory>
#include <unordered_map>
#include <string>
#include "aeongui/Platform.hpp"
#include "aeongui/Canvas.hpp"
#include "aeongui/dom/EventTarget.hpp"
#include "aeongui/dom/USVString.hpp"
#include "aeongui/dom/DOMString.hpp"
#include "aeongui/dom/Location.hpp"
#include "aeongui/dom/Document.hpp"
 
namespace AeonGUI
{
    namespace DOM
    {
        class Document;
        class Window : public EventTarget
        {
        public:
            DLL Window ();
            DLL Window ( uint32_t aWidth, uint32_t aHeight );
            DLL ~Window () override final;
            DLL void ResizeViewport ( uint32_t aWidth, uint32_t aHeight );
            DLL const uint8_t* GetPixels() const;
            DLL size_t GetWidth() const;
            DLL size_t GetHeight() const;
            DLL size_t GetStride() const;
            DLL bool Draw();
            DLL void Update ( double aDeltaTime );
            DLL const Document* document() const;
            DLL Location& location() const;
            DLL void HandleMouseMove ( double aX, double aY, unsigned short aButtons = 0,
                                       bool aCtrlKey = false, bool aShiftKey = false,
                                       bool aAltKey = false, bool aMetaKey = false );
            DLL void HandleMouseDown ( double aX, double aY, short aButton = 0,
                                       unsigned short aButtons = 0,
                                       bool aCtrlKey = false, bool aShiftKey = false,
                                       bool aAltKey = false, bool aMetaKey = false );
            DLL void HandleMouseUp ( double aX, double aY, short aButton = 0,
                                     unsigned short aButtons = 0,
                                     bool aCtrlKey = false, bool aShiftKey = false,
                                     bool aAltKey = false, bool aMetaKey = false );
            DLL void HandleKeyDown ( const DOMString& aKey, const DOMString& aCode,
                                     unsigned long aLocation = 0, bool aRepeat = false,
                                     bool aCtrlKey = false, bool aShiftKey = false,
                                     bool aAltKey = false, bool aMetaKey = false );
            DLL void HandleKeyUp ( const DOMString& aKey, const DOMString& aCode,
                                   unsigned long aLocation = 0,
                                   bool aCtrlKey = false, bool aShiftKey = false,
                                   bool aAltKey = false, bool aMetaKey = false );
            DLL void HandleWheel ( double aX, double aY,
                                   double aDeltaX, double aDeltaY,
                                   unsigned long aDeltaMode = 0,
                                   unsigned short aButtons = 0,
                                   bool aCtrlKey = false, bool aShiftKey = false,
                                   bool aAltKey = false, bool aMetaKey = false );
        private:
            void OnLocationChanged ( const Location& location );
            Element* elementFromPoint ( double aX, double aY ) const;
            void FullDraw();
            void PartialDraw();
            void AssignPickIds();
            void CacheBounds();
            Element* mFocusedElement{nullptr}; 
            Element* mHoverElement{nullptr};   
            Element* mActiveElement{nullptr};  
            Location mLocation{std::bind ( &Window::OnLocationChanged, this, std::placeholders::_1 ) };
            Document mDocument{};
            std::unique_ptr<Canvas> mCanvas;
            std::array<Element*, 256> mPickElements{}; 
            uint8_t mPickIdCounter{0}; 
            std::unordered_map<const Element*, Canvas::PickBounds> mCachedBounds{};
        };
    }
}
#endif