IAEngine/Src/Editor/imp/cpp/UI/UI.cpp

// IAEngine: 2D Game Engine by IA
// Copyright (C) 2025 IASoft (PVT) LTD (oss@iasoft.dev)
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

#include <IAEngine/IAEngine.hpp>
#include <RenderCore/RenderCore.hpp>

#include <UI/UI.hpp>
#include <UI/View/Asset.hpp>
#include <UI/View/AssetBrowser.hpp>
#include <UI/View/Console.hpp>
#include <UI/View/Nodes.hpp>
#include <UI/View/Package.hpp>
#include <UI/View/Properties.hpp>
#include <UI/View/Scene.hpp>

#include <UI/TabContainer.hpp>

namespace ia::iae
{
    STATIC CONSTEXPR PCCHAR VIEW_NAME_ASSET_BROWSER = "AssetBrowser";
    STATIC CONSTEXPR PCCHAR VIEW_NAME_ASSET = "Asset";
    STATIC CONSTEXPR PCCHAR VIEW_NAME_CONSOLE = "Console";
    STATIC CONSTEXPR PCCHAR VIEW_NAME_NODES = "Nodes";
    STATIC CONSTEXPR PCCHAR VIEW_NAME_PACKAGE = "Package";
    STATIC CONSTEXPR PCCHAR VIEW_NAME_PROPERTIES = "Properties";
    STATIC CONSTEXPR PCCHAR VIEW_NAME_SCENE = "SCENE";

    EXTERN IVec2 g_windowExtent;

    IView *UI::s_focusedView{};

    TabContainer g_tabContainerB;
    TabContainer g_tabContainerTL;
    TabContainer g_tabContainerTM;
    TabContainer g_tabContainerTR;

    VOID UI::FocusAssetView()
    {
        g_tabContainerTR.ChangeActiveTab(VIEW_NAME_ASSET);
    }

    class View_Asset *UI::GetAssetView()
    {
        return (View_Asset*)g_tabContainerTR.GetTab(VIEW_NAME_ASSET);
    }

    VOID UI::Initialize()
    {
        g_tabContainerB.Initialize();
        g_tabContainerTL.Initialize();
        g_tabContainerTM.Initialize();
        g_tabContainerTR.Initialize();

        g_tabContainerB.AddTab<View_AssetBrowser>(VIEW_NAME_ASSET_BROWSER);
        g_tabContainerB.AddTab<View_Console>(VIEW_NAME_CONSOLE);

        g_tabContainerTL.AddTab<View_Nodes>(VIEW_NAME_NODES);
        g_tabContainerTL.AddTab<View_Package>(VIEW_NAME_PACKAGE);

        g_tabContainerTM.AddTab<View_Scene>(VIEW_NAME_SCENE);

        g_tabContainerTR.AddTab<View_Properties>(VIEW_NAME_PROPERTIES);
        g_tabContainerTR.AddTab<View_Asset>(VIEW_NAME_ASSET);
    }

    VOID UI::Terminate()
    {
        g_tabContainerB.Terminate();
        g_tabContainerTL.Terminate();
        g_tabContainerTM.Terminate();
        g_tabContainerTR.Terminate();
    }

    VOID UI::Update()
    {
        g_tabContainerB.Update();
        g_tabContainerTL.Update();
        g_tabContainerTM.Update();
        g_tabContainerTR.Update();
    }

    VOID UI::ProcessEvent(IN SDL_Event *event)
    {
        g_tabContainerB.ProcessEvent(event);
        g_tabContainerTL.ProcessEvent(event);
        g_tabContainerTM.ProcessEvent(event);
        g_tabContainerTR.ProcessEvent(event);
    }

    VOID UI::Draw()
    {
        DrawMenuBar();

        g_tabContainerB.Draw({0.0f, LAYOUT_TOP_MIDDLE_VIEW_EXTENT.y * g_windowExtent.y + MENUBAR_HEIGHT},
                             {g_windowExtent.x * LAYOUT_BOTTOM_VIEW_EXTENT.x,
                              g_windowExtent.y * LAYOUT_BOTTOM_VIEW_EXTENT.y - MENUBAR_HEIGHT});
        g_tabContainerTL.Draw({0.0f, MENUBAR_HEIGHT}, {g_windowExtent.x * LAYOUT_TOP_LEFT_VIEW_EXTENT.x,
                                                       g_windowExtent.y * LAYOUT_TOP_LEFT_VIEW_EXTENT.y});
        g_tabContainerTM.Draw(
            {g_windowExtent.x * LAYOUT_TOP_LEFT_VIEW_EXTENT.x, MENUBAR_HEIGHT},
            {g_windowExtent.x * LAYOUT_TOP_MIDDLE_VIEW_EXTENT.x, g_windowExtent.y * LAYOUT_TOP_MIDDLE_VIEW_EXTENT.y});
        g_tabContainerTR.Draw(
            {g_windowExtent.x * (1.0f - LAYOUT_TOP_RIGHT_VIEW_EXTENT.x), MENUBAR_HEIGHT},
            {g_windowExtent.x * LAYOUT_TOP_RIGHT_VIEW_EXTENT.x, g_windowExtent.y * LAYOUT_TOP_RIGHT_VIEW_EXTENT.y});
    }

    VOID UI::DrawMenuBar()
    {
        if (ImGui::BeginMainMenuBar())
        {
            if (ImGui::BeginMenu("File"))
            {
                if (ImGui::MenuItem("New Scene", nullptr, nullptr))
                {
                }
                UI::PadY();
                if (ImGui::MenuItem("Open Scene", nullptr, nullptr))
                {
                }
                UI::PadY();
                ImGui::Separator();
                UI::PadY();
                if (ImGui::MenuItem("Exit", nullptr, nullptr))
                    SDL_Quit();
                ImGui::EndMenu();
            }
            ImGui::EndMainMenuBar();
        }
    }

    VOID UI::PadX(IN FLOAT32 v)
    {
        ImGui::SetCursorPosX(ImGui::GetCursorPosX() + v);
    }

    VOID UI::PadY(IN FLOAT32 v)
    {
        ImGui::SetCursorPosY(ImGui::GetCursorPosY() + v);
    }

    VOID UI::AlignCursorLeft(IN CONST ImRect &rect)
    {
        ImGui::SetCursorPosX(rect.GetTL().x);
    }

    VOID UI::AlignCursorRight(IN CONST ImRect &rect, IN FLOAT32 width)
    {
        ImGui::SetCursorPosX(rect.GetWidth() - width);
    }

    VOID UI::AlignCursorTop(IN CONST ImRect &rect)
    {
        ImGui::SetCursorPosY(rect.AsVec4().y);
    }

    VOID UI::AlignCursorBottom(IN CONST ImRect &rect, IN FLOAT32 height)
    {
        ImGui::SetCursorPosY(rect.GetHeight() - height);
    }

    VOID UI::AlignCursorHCenter(IN CONST ImRect &rect, IN FLOAT32 width)
    {
        ImGui::SetCursorPosX((rect.GetWidth() - width) / 2.0f);
    }

    VOID UI::AlignCursorVCenter(IN CONST ImRect &rect, IN FLOAT32 height)
    {
        ImGui::SetCursorPosY((rect.GetHeight() - height) / 2.0f);
    }
} // namespace ia::iae