feat: themes and better UI

6 files changed, 329 insertions, 94 deletions

diff --git a/src/core/application.cpp b/src/core/application.cpp
index 0698ce3..30194de 100644
--- a/src/core/application.cpp
+++ b/src/core/application.cpp
@@ -7,6 +7,7 @@
 
 #include <GLFW/glfw3.h>
 
+
 namespace Donut
 {
     Application* Application::s_instance = nullptr;
@@ -133,7 +134,14 @@ namespace Donut
         m_state_manager->render();
         
         m_window->begin_im_gui_frame();
+        setup_docking_layout();
         m_state_manager->on_im_ui_render();
         m_window->end_im_gui_frame();
     }
+    
+    void Application::setup_docking_layout()
+    {
+        ImGuiViewport* viewport = ImGui::GetMainViewport();
+        ImGui::DockSpaceOverViewport(0, viewport, ImGuiDockNodeFlags_PassthruCentralNode);
+    }
 };
diff --git a/src/core/application.h b/src/core/application.h
index d0abac3..521b15b 100644
--- a/src/core/application.h
+++ b/src/core/application.h
@@ -27,6 +27,7 @@ namespace Donut
         void on_update();
         void on_render();
         void on_event(Event& event);
+        void setup_docking_layout();
     private:
         Scope<StateManager> m_state_manager;
         Scope<Window> m_window;
diff --git a/src/core/theme_manager.cpp b/src/core/theme_manager.cpp
new file mode 100644
index 0000000..db48e12
--- /dev/null
+++ b/src/core/theme_manager.cpp
@@ -0,0 +1,291 @@
+#include "theme_manager.h"
+
+namespace Donut
+{
+    Theme ThemeManager::s_current_theme = Theme::Dark;
+
+    void ThemeManager::set_theme(Theme theme)
+    {
+        s_current_theme = theme;
+        
+        switch (theme)
+        {
+            case Theme::Dark:
+                apply_dark_theme();
+                break;
+            case Theme::Light:
+                apply_light_theme();
+                break;
+            case Theme::Blue:
+                apply_blue_theme();
+                break;
+        }
+    }
+
+    void ThemeManager::apply_dark_theme()
+    {
+        ImGuiStyle& style = ImGui::GetStyle();
+        ImVec4* colors = style.Colors;
+
+        colors[ImGuiCol_Text]                   = ImVec4(0.95f, 0.95f, 0.95f, 1.00f);
+        colors[ImGuiCol_TextDisabled]           = ImVec4(0.50f, 0.50f, 0.50f, 1.00f);
+        colors[ImGuiCol_WindowBg]               = ImVec4(0.08f, 0.08f, 0.08f, 0.95f);
+        colors[ImGuiCol_ChildBg]                = ImVec4(0.06f, 0.06f, 0.06f, 0.95f);
+        colors[ImGuiCol_PopupBg]                = ImVec4(0.08f, 0.08f, 0.08f, 0.95f);
+        colors[ImGuiCol_Border]                 = ImVec4(0.25f, 0.25f, 0.25f, 0.54f);
+        colors[ImGuiCol_BorderShadow]           = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
+        colors[ImGuiCol_FrameBg]                = ImVec4(0.12f, 0.12f, 0.12f, 0.95f);
+        colors[ImGuiCol_FrameBgHovered]         = ImVec4(0.18f, 0.18f, 0.18f, 0.95f);
+        colors[ImGuiCol_FrameBgActive]          = ImVec4(0.22f, 0.22f, 0.22f, 0.95f);
+        colors[ImGuiCol_TitleBg]                = ImVec4(0.08f, 0.08f, 0.08f, 1.00f);
+        colors[ImGuiCol_TitleBgActive]          = ImVec4(0.08f, 0.08f, 0.08f, 1.00f);
+        colors[ImGuiCol_TitleBgCollapsed]       = ImVec4(0.00f, 0.00f, 0.00f, 0.51f);
+        colors[ImGuiCol_MenuBarBg]              = ImVec4(0.14f, 0.14f, 0.14f, 1.00f);
+        colors[ImGuiCol_ScrollbarBg]            = ImVec4(0.02f, 0.02f, 0.02f, 0.53f);
+        colors[ImGuiCol_ScrollbarGrab]          = ImVec4(0.31f, 0.31f, 0.31f, 1.00f);
+        colors[ImGuiCol_ScrollbarGrabHovered]   = ImVec4(0.41f, 0.41f, 0.41f, 1.00f);
+        colors[ImGuiCol_ScrollbarGrabActive]    = ImVec4(0.51f, 0.51f, 0.51f, 1.00f);
+        colors[ImGuiCol_CheckMark]              = ImVec4(0.60f, 0.60f, 0.60f, 0.95f);
+        colors[ImGuiCol_SliderGrab]             = ImVec4(0.60f, 0.60f, 0.60f, 0.95f);
+        colors[ImGuiCol_SliderGrabActive]       = ImVec4(0.70f, 0.70f, 0.70f, 0.95f);
+        colors[ImGuiCol_Button]                 = ImVec4(0.15f, 0.15f, 0.15f, 0.95f);
+        colors[ImGuiCol_ButtonHovered]          = ImVec4(0.20f, 0.20f, 0.20f, 0.95f);
+        colors[ImGuiCol_ButtonActive]           = ImVec4(0.25f, 0.25f, 0.25f, 0.95f);
+        colors[ImGuiCol_Header]                 = ImVec4(0.15f, 0.15f, 0.15f, 0.95f);
+        colors[ImGuiCol_HeaderHovered]          = ImVec4(0.20f, 0.20f, 0.20f, 0.95f);
+        colors[ImGuiCol_HeaderActive]           = ImVec4(0.25f, 0.25f, 0.25f, 0.95f);
+        colors[ImGuiCol_Separator]              = ImVec4(0.43f, 0.43f, 0.43f, 0.50f);
+        colors[ImGuiCol_SeparatorHovered]       = ImVec4(0.50f, 0.50f, 0.50f, 1.00f);
+        colors[ImGuiCol_SeparatorActive]        = ImVec4(0.60f, 0.60f, 0.60f, 1.00f);
+        colors[ImGuiCol_ResizeGrip]             = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
+        colors[ImGuiCol_ResizeGripHovered]      = ImVec4(0.29f, 0.30f, 0.31f, 0.67f);
+        colors[ImGuiCol_ResizeGripActive]       = ImVec4(0.60f, 0.60f, 0.60f, 0.95f);
+        colors[ImGuiCol_Tab]                    = ImVec4(0.08f, 0.08f, 0.08f, 0.83f);
+        colors[ImGuiCol_TabHovered]             = ImVec4(0.15f, 0.15f, 0.15f, 0.83f);
+        colors[ImGuiCol_TabActive]              = ImVec4(0.20f, 0.20f, 0.20f, 1.00f);
+        colors[ImGuiCol_TabUnfocused]           = ImVec4(0.08f, 0.08f, 0.08f, 0.97f);
+        colors[ImGuiCol_TabUnfocusedActive]     = ImVec4(0.13f, 0.13f, 0.13f, 1.00f);
+        colors[ImGuiCol_DockingPreview]         = ImVec4(0.60f, 0.60f, 0.60f, 0.70f);
+        colors[ImGuiCol_DockingEmptyBg]         = ImVec4(0.20f, 0.20f, 0.20f, 1.00f);
+        colors[ImGuiCol_PlotLines]              = ImVec4(0.61f, 0.61f, 0.61f, 1.00f);
+        colors[ImGuiCol_PlotLinesHovered]       = ImVec4(1.00f, 0.43f, 0.35f, 1.00f);
+        colors[ImGuiCol_PlotHistogram]          = ImVec4(0.90f, 0.70f, 0.00f, 1.00f);
+        colors[ImGuiCol_PlotHistogramHovered]   = ImVec4(1.00f, 0.60f, 0.00f, 1.00f);
+        colors[ImGuiCol_TextSelectedBg]         = ImVec4(0.60f, 0.60f, 0.60f, 0.35f);
+        colors[ImGuiCol_DragDropTarget]         = ImVec4(0.60f, 0.60f, 0.60f, 1.00f);
+        colors[ImGuiCol_NavHighlight]           = ImVec4(0.60f, 0.60f, 0.60f, 1.00f);
+        colors[ImGuiCol_NavWindowingHighlight]  = ImVec4(1.00f, 1.00f, 1.00f, 0.70f);
+        colors[ImGuiCol_NavWindowingDimBg]      = ImVec4(0.80f, 0.80f, 0.80f, 0.20f);
+        colors[ImGuiCol_ModalWindowDimBg]       = ImVec4(0.80f, 0.80f, 0.80f, 0.35f);
+
+        style.WindowPadding     = ImVec2(8, 8);
+        style.FramePadding      = ImVec2(5, 2);
+        style.CellPadding       = ImVec2(6, 4);
+        style.ItemSpacing       = ImVec2(6, 4);
+        style.ItemInnerSpacing  = ImVec2(4, 4);
+        style.IndentSpacing     = 21;
+        style.ScrollbarSize     = 14;
+        style.GrabMinSize       = 10;
+
+        style.WindowBorderSize  = 1;
+        style.ChildBorderSize   = 1;
+        style.PopupBorderSize   = 1;
+        style.FrameBorderSize   = 0;
+        style.TabBorderSize     = 0;
+
+        style.WindowRounding    = 8.0f;
+        style.ChildRounding     = 6.0f;
+        style.FrameRounding     = 4.0f;
+        style.PopupRounding     = 4.0f;
+        style.ScrollbarRounding = 4.0f;
+        style.GrabRounding      = 4.0f;
+        style.TabRounding       = 4.0f;
+
+        style.WindowTitleAlign  = ImVec2(0.5f, 0.5f);
+        style.ButtonTextAlign   = ImVec2(0.5f, 0.5f);
+        style.SelectableTextAlign = ImVec2(0.0f, 0.0f);
+
+        style.DisplaySafeAreaPadding = ImVec2(3, 3);
+        
+        style.Alpha = 1.0f;
+        style.DisabledAlpha = 0.6f;
+    }
+
+    void ThemeManager::apply_light_theme()
+    {
+        ImGuiStyle& style = ImGui::GetStyle();
+        ImVec4* colors = style.Colors;
+
+        colors[ImGuiCol_Text]                   = ImVec4(0.10f, 0.10f, 0.10f, 1.00f);
+        colors[ImGuiCol_TextDisabled]           = ImVec4(0.60f, 0.60f, 0.60f, 1.00f);
+        colors[ImGuiCol_WindowBg]               = ImVec4(0.95f, 0.95f, 0.95f, 0.95f);
+        colors[ImGuiCol_ChildBg]                = ImVec4(0.92f, 0.92f, 0.92f, 0.95f);
+        colors[ImGuiCol_PopupBg]                = ImVec4(0.95f, 0.95f, 0.95f, 0.95f);
+        colors[ImGuiCol_Border]                 = ImVec4(0.70f, 0.70f, 0.70f, 0.54f);
+        colors[ImGuiCol_BorderShadow]           = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
+        colors[ImGuiCol_FrameBg]                = ImVec4(0.85f, 0.85f, 0.85f, 0.95f);
+        colors[ImGuiCol_FrameBgHovered]         = ImVec4(0.80f, 0.80f, 0.80f, 0.95f);
+        colors[ImGuiCol_FrameBgActive]          = ImVec4(0.75f, 0.75f, 0.75f, 0.95f);
+        colors[ImGuiCol_TitleBg]                = ImVec4(0.90f, 0.90f, 0.90f, 1.00f);
+        colors[ImGuiCol_TitleBgActive]          = ImVec4(0.85f, 0.85f, 0.85f, 1.00f);
+        colors[ImGuiCol_TitleBgCollapsed]       = ImVec4(0.95f, 0.95f, 0.95f, 0.51f);
+        colors[ImGuiCol_MenuBarBg]              = ImVec4(0.88f, 0.88f, 0.88f, 1.00f);
+        colors[ImGuiCol_ScrollbarBg]            = ImVec4(0.90f, 0.90f, 0.90f, 0.53f);
+        colors[ImGuiCol_ScrollbarGrab]          = ImVec4(0.70f, 0.70f, 0.70f, 1.00f);
+        colors[ImGuiCol_ScrollbarGrabHovered]   = ImVec4(0.60f, 0.60f, 0.60f, 1.00f);
+        colors[ImGuiCol_ScrollbarGrabActive]    = ImVec4(0.50f, 0.50f, 0.50f, 1.00f);
+        colors[ImGuiCol_CheckMark]              = ImVec4(0.20f, 0.60f, 0.90f, 0.95f);
+        colors[ImGuiCol_SliderGrab]             = ImVec4(0.20f, 0.60f, 0.90f, 0.95f);
+        colors[ImGuiCol_SliderGrabActive]       = ImVec4(0.15f, 0.50f, 0.80f, 0.95f);
+        colors[ImGuiCol_Button]                 = ImVec4(0.80f, 0.80f, 0.80f, 0.95f);
+        colors[ImGuiCol_ButtonHovered]          = ImVec4(0.75f, 0.75f, 0.75f, 0.95f);
+        colors[ImGuiCol_ButtonActive]           = ImVec4(0.70f, 0.70f, 0.70f, 0.95f);
+        colors[ImGuiCol_Header]                 = ImVec4(0.85f, 0.85f, 0.85f, 0.95f);
+        colors[ImGuiCol_HeaderHovered]          = ImVec4(0.80f, 0.80f, 0.80f, 0.95f);
+        colors[ImGuiCol_HeaderActive]           = ImVec4(0.75f, 0.75f, 0.75f, 0.95f);
+        colors[ImGuiCol_Separator]              = ImVec4(0.70f, 0.70f, 0.70f, 0.50f);
+        colors[ImGuiCol_SeparatorHovered]       = ImVec4(0.60f, 0.60f, 0.60f, 1.00f);
+        colors[ImGuiCol_SeparatorActive]        = ImVec4(0.50f, 0.50f, 0.50f, 1.00f);
+        colors[ImGuiCol_ResizeGrip]             = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
+        colors[ImGuiCol_ResizeGripHovered]      = ImVec4(0.60f, 0.60f, 0.60f, 0.67f);
+        colors[ImGuiCol_ResizeGripActive]       = ImVec4(0.20f, 0.60f, 0.90f, 0.95f);
+        colors[ImGuiCol_Tab]                    = ImVec4(0.85f, 0.85f, 0.85f, 0.83f);
+        colors[ImGuiCol_TabHovered]             = ImVec4(0.80f, 0.80f, 0.80f, 0.83f);
+        colors[ImGuiCol_TabActive]              = ImVec4(0.75f, 0.75f, 0.75f, 1.00f);
+        colors[ImGuiCol_TabUnfocused]           = ImVec4(0.90f, 0.90f, 0.90f, 0.97f);
+        colors[ImGuiCol_TabUnfocusedActive]     = ImVec4(0.85f, 0.85f, 0.85f, 1.00f);
+        colors[ImGuiCol_DockingPreview]         = ImVec4(0.20f, 0.60f, 0.90f, 0.70f);
+        colors[ImGuiCol_DockingEmptyBg]         = ImVec4(0.90f, 0.90f, 0.90f, 1.00f);
+        colors[ImGuiCol_PlotLines]              = ImVec4(0.40f, 0.40f, 0.40f, 1.00f);
+        colors[ImGuiCol_PlotLinesHovered]       = ImVec4(0.90f, 0.30f, 0.20f, 1.00f);
+        colors[ImGuiCol_PlotHistogram]          = ImVec4(0.70f, 0.50f, 0.00f, 1.00f);
+        colors[ImGuiCol_PlotHistogramHovered]   = ImVec4(0.80f, 0.40f, 0.00f, 1.00f);
+        colors[ImGuiCol_TextSelectedBg]         = ImVec4(0.20f, 0.60f, 0.90f, 0.35f);
+        colors[ImGuiCol_DragDropTarget]         = ImVec4(0.10f, 0.50f, 0.80f, 1.00f);
+        colors[ImGuiCol_NavHighlight]           = ImVec4(0.20f, 0.60f, 0.90f, 1.00f);
+        colors[ImGuiCol_NavWindowingHighlight]  = ImVec4(0.10f, 0.10f, 0.10f, 0.70f);
+        colors[ImGuiCol_NavWindowingDimBg]      = ImVec4(0.20f, 0.20f, 0.20f, 0.20f);
+        colors[ImGuiCol_ModalWindowDimBg]       = ImVec4(0.20f, 0.20f, 0.20f, 0.35f);
+
+        style.WindowPadding     = ImVec2(8, 8);
+        style.FramePadding      = ImVec2(5, 2);
+        style.CellPadding       = ImVec2(6, 4);
+        style.ItemSpacing       = ImVec2(6, 4);
+        style.ItemInnerSpacing  = ImVec2(4, 4);
+        style.IndentSpacing     = 21;
+        style.ScrollbarSize     = 14;
+        style.GrabMinSize       = 10;
+
+        style.WindowBorderSize  = 1;
+        style.ChildBorderSize   = 1;
+        style.PopupBorderSize   = 1;
+        style.FrameBorderSize   = 0;
+        style.TabBorderSize     = 0;
+
+        style.WindowRounding    = 8.0f;
+        style.ChildRounding     = 6.0f;
+        style.FrameRounding     = 4.0f;
+        style.PopupRounding     = 4.0f;
+        style.ScrollbarRounding = 4.0f;
+        style.GrabRounding      = 4.0f;
+        style.TabRounding       = 4.0f;
+
+        style.WindowTitleAlign  = ImVec2(0.5f, 0.5f);
+        style.ButtonTextAlign   = ImVec2(0.5f, 0.5f);
+        style.SelectableTextAlign = ImVec2(0.0f, 0.0f);
+
+        style.DisplaySafeAreaPadding = ImVec2(3, 3);
+        
+        style.Alpha = 1.0f;
+        style.DisabledAlpha = 0.6f;
+    }
+
+    void ThemeManager::apply_blue_theme()
+    {
+        ImGuiStyle& style = ImGui::GetStyle();
+        ImVec4* colors = style.Colors;
+
+        colors[ImGuiCol_Text]                   = ImVec4(0.95f, 0.95f, 0.95f, 1.00f);
+        colors[ImGuiCol_TextDisabled]           = ImVec4(0.50f, 0.50f, 0.50f, 1.00f);
+        colors[ImGuiCol_WindowBg]               = ImVec4(0.05f, 0.10f, 0.20f, 0.95f);
+        colors[ImGuiCol_ChildBg]                = ImVec4(0.03f, 0.08f, 0.18f, 0.95f);
+        colors[ImGuiCol_PopupBg]                = ImVec4(0.05f, 0.10f, 0.20f, 0.95f);
+        colors[ImGuiCol_Border]                 = ImVec4(0.20f, 0.30f, 0.50f, 0.54f);
+        colors[ImGuiCol_BorderShadow]           = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
+        colors[ImGuiCol_FrameBg]                = ImVec4(0.08f, 0.15f, 0.30f, 0.95f);
+        colors[ImGuiCol_FrameBgHovered]         = ImVec4(0.12f, 0.20f, 0.40f, 0.95f);
+        colors[ImGuiCol_FrameBgActive]          = ImVec4(0.15f, 0.25f, 0.45f, 0.95f);
+        colors[ImGuiCol_TitleBg]                = ImVec4(0.05f, 0.10f, 0.20f, 1.00f);
+        colors[ImGuiCol_TitleBgActive]          = ImVec4(0.05f, 0.10f, 0.20f, 1.00f);
+        colors[ImGuiCol_TitleBgCollapsed]       = ImVec4(0.00f, 0.00f, 0.00f, 0.51f);
+        colors[ImGuiCol_MenuBarBg]              = ImVec4(0.08f, 0.15f, 0.25f, 1.00f);
+        colors[ImGuiCol_ScrollbarBg]            = ImVec4(0.02f, 0.05f, 0.10f, 0.53f);
+        colors[ImGuiCol_ScrollbarGrab]          = ImVec4(0.30f, 0.40f, 0.60f, 1.00f);
+        colors[ImGuiCol_ScrollbarGrabHovered]   = ImVec4(0.40f, 0.50f, 0.70f, 1.00f);
+        colors[ImGuiCol_ScrollbarGrabActive]    = ImVec4(0.50f, 0.60f, 0.80f, 1.00f);
+        colors[ImGuiCol_CheckMark]              = ImVec4(0.20f, 0.60f, 1.00f, 0.95f);
+        colors[ImGuiCol_SliderGrab]             = ImVec4(0.20f, 0.60f, 1.00f, 0.95f);
+        colors[ImGuiCol_SliderGrabActive]       = ImVec4(0.30f, 0.70f, 1.00f, 0.95f);
+        colors[ImGuiCol_Button]                 = ImVec4(0.10f, 0.20f, 0.40f, 0.95f);
+        colors[ImGuiCol_ButtonHovered]          = ImVec4(0.15f, 0.25f, 0.45f, 0.95f);
+        colors[ImGuiCol_ButtonActive]           = ImVec4(0.20f, 0.30f, 0.50f, 0.95f);
+        colors[ImGuiCol_Header]                 = ImVec4(0.10f, 0.20f, 0.40f, 0.95f);
+        colors[ImGuiCol_HeaderHovered]          = ImVec4(0.15f, 0.25f, 0.45f, 0.95f);
+        colors[ImGuiCol_HeaderActive]           = ImVec4(0.20f, 0.30f, 0.50f, 0.95f);
+        colors[ImGuiCol_Separator]              = ImVec4(0.30f, 0.40f, 0.60f, 0.50f);
+        colors[ImGuiCol_SeparatorHovered]       = ImVec4(0.40f, 0.50f, 0.70f, 1.00f);
+        colors[ImGuiCol_SeparatorActive]        = ImVec4(0.50f, 0.60f, 0.80f, 1.00f);
+        colors[ImGuiCol_ResizeGrip]             = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
+        colors[ImGuiCol_ResizeGripHovered]      = ImVec4(0.30f, 0.40f, 0.60f, 0.67f);
+        colors[ImGuiCol_ResizeGripActive]       = ImVec4(0.20f, 0.60f, 1.00f, 0.95f);
+        colors[ImGuiCol_Tab]                    = ImVec4(0.08f, 0.15f, 0.25f, 0.83f);
+        colors[ImGuiCol_TabHovered]             = ImVec4(0.12f, 0.20f, 0.35f, 0.83f);
+        colors[ImGuiCol_TabActive]              = ImVec4(0.15f, 0.25f, 0.40f, 1.00f);
+        colors[ImGuiCol_TabUnfocused]           = ImVec4(0.05f, 0.10f, 0.20f, 0.97f);
+        colors[ImGuiCol_TabUnfocusedActive]     = ImVec4(0.08f, 0.15f, 0.25f, 1.00f);
+        colors[ImGuiCol_DockingPreview]         = ImVec4(0.20f, 0.60f, 1.00f, 0.70f);
+        colors[ImGuiCol_DockingEmptyBg]         = ImVec4(0.05f, 0.10f, 0.20f, 1.00f);
+        colors[ImGuiCol_PlotLines]              = ImVec4(0.60f, 0.70f, 0.90f, 1.00f);
+        colors[ImGuiCol_PlotLinesHovered]       = ImVec4(1.00f, 0.60f, 0.40f, 1.00f);
+        colors[ImGuiCol_PlotHistogram]          = ImVec4(0.90f, 0.70f, 0.30f, 1.00f);
+        colors[ImGuiCol_PlotHistogramHovered]   = ImVec4(1.00f, 0.80f, 0.40f, 1.00f);
+        colors[ImGuiCol_TextSelectedBg]         = ImVec4(0.20f, 0.60f, 1.00f, 0.35f);
+        colors[ImGuiCol_DragDropTarget]         = ImVec4(0.10f, 0.50f, 0.90f, 1.00f);
+        colors[ImGuiCol_NavHighlight]           = ImVec4(0.20f, 0.60f, 1.00f, 1.00f);
+        colors[ImGuiCol_NavWindowingHighlight]  = ImVec4(1.00f, 1.00f, 1.00f, 0.70f);
+        colors[ImGuiCol_NavWindowingDimBg]      = ImVec4(0.80f, 0.80f, 0.80f, 0.20f);
+        colors[ImGuiCol_ModalWindowDimBg]       = ImVec4(0.80f, 0.80f, 0.80f, 0.35f);
+
+        style.WindowPadding     = ImVec2(8, 8);
+        style.FramePadding      = ImVec2(5, 2);
+        style.CellPadding       = ImVec2(6, 4);
+        style.ItemSpacing       = ImVec2(6, 4);
+        style.ItemInnerSpacing  = ImVec2(4, 4);
+        style.IndentSpacing     = 21;
+        style.ScrollbarSize     = 14;
+        style.GrabMinSize       = 10;
+
+        style.WindowBorderSize  = 1;
+        style.ChildBorderSize   = 1;
+        style.PopupBorderSize   = 1;
+        style.FrameBorderSize   = 0;
+        style.TabBorderSize     = 0;
+
+        style.WindowRounding    = 8.0f;
+        style.ChildRounding     = 6.0f;
+        style.FrameRounding     = 4.0f;
+        style.PopupRounding     = 4.0f;
+        style.ScrollbarRounding = 4.0f;
+        style.GrabRounding      = 4.0f;
+        style.TabRounding       = 4.0f;
+
+        style.WindowTitleAlign  = ImVec2(0.5f, 0.5f);
+        style.ButtonTextAlign   = ImVec2(0.5f, 0.5f);
+        style.SelectableTextAlign = ImVec2(0.0f, 0.0f);
+
+        style.DisplaySafeAreaPadding = ImVec2(3, 3);
+        
+        style.Alpha = 1.0f;
+        style.DisabledAlpha = 0.6f;
+    }
+}
diff --git a/src/core/theme_manager.h b/src/core/theme_manager.h
new file mode 100644
index 0000000..7c1a295
--- /dev/null
+++ b/src/core/theme_manager.h
@@ -0,0 +1,27 @@
+#pragma once
+
+#include <imgui.h>
+
+namespace Donut
+{
+    enum class Theme
+    {
+        Dark = 0,
+        Light = 1,
+        Blue = 2
+    };
+
+    class ThemeManager
+    {
+    public:
+        static void set_theme(Theme theme);
+        static Theme get_current_theme() { return s_current_theme; }
+        
+        static void apply_dark_theme();
+        static void apply_light_theme();
+        static void apply_blue_theme();
+        
+    private:
+        static Theme s_current_theme;
+    };
+}
diff --git a/src/core/window.cpp b/src/core/window.cpp
index 8441b85..c1d714a 100644
--- a/src/core/window.cpp
+++ b/src/core/window.cpp
@@ -1,5 +1,6 @@
 #include <glad/glad.h>
 #include "window.h"
+#include "theme_manager.h"
 
 #include <cstdint>
 
@@ -120,7 +121,7 @@ namespace Donut
         io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;
 
         setup_im_gui_fonts();
-        apply_im_gui_theme();
+        ThemeManager::set_theme(Theme::Dark);
 
         ImGuiStyle& style = ImGui::GetStyle();
         if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
@@ -161,98 +162,6 @@ namespace Donut
         DONUT_INFO("ImGUI fonts loaded successfully");
     }
 
-    void Window::apply_im_gui_theme()
-    {
-        ImGuiStyle& style = ImGui::GetStyle();
-        ImVec4* colors = style.Colors;
-
-        colors[ImGuiCol_Text]                   = ImVec4(0.95f, 0.95f, 0.95f, 1.00f);
-        colors[ImGuiCol_TextDisabled]           = ImVec4(0.50f, 0.50f, 0.50f, 1.00f);
-        colors[ImGuiCol_WindowBg]               = ImVec4(0.13f, 0.14f, 0.15f, 1.00f);
-        colors[ImGuiCol_ChildBg]                = ImVec4(0.13f, 0.14f, 0.15f, 1.00f);
-        colors[ImGuiCol_PopupBg]                = ImVec4(0.13f, 0.14f, 0.15f, 1.00f);
-        colors[ImGuiCol_Border]                 = ImVec4(0.25f, 0.25f, 0.26f, 0.54f);
-        colors[ImGuiCol_BorderShadow]           = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
-        colors[ImGuiCol_FrameBg]                = ImVec4(0.25f, 0.25f, 0.26f, 1.00f);
-        colors[ImGuiCol_FrameBgHovered]         = ImVec4(0.38f, 0.38f, 0.39f, 1.00f);
-        colors[ImGuiCol_FrameBgActive]          = ImVec4(0.67f, 0.67f, 0.67f, 0.39f);
-        colors[ImGuiCol_TitleBg]                = ImVec4(0.08f, 0.08f, 0.09f, 1.00f);
-        colors[ImGuiCol_TitleBgActive]          = ImVec4(0.08f, 0.08f, 0.09f, 1.00f);
-        colors[ImGuiCol_TitleBgCollapsed]       = ImVec4(0.00f, 0.00f, 0.00f, 0.51f);
-        colors[ImGuiCol_MenuBarBg]              = ImVec4(0.14f, 0.14f, 0.14f, 1.00f);
-        colors[ImGuiCol_ScrollbarBg]            = ImVec4(0.02f, 0.02f, 0.02f, 0.53f);
-        colors[ImGuiCol_ScrollbarGrab]          = ImVec4(0.31f, 0.31f, 0.31f, 1.00f);
-        colors[ImGuiCol_ScrollbarGrabHovered]   = ImVec4(0.41f, 0.41f, 0.41f, 1.00f);
-        colors[ImGuiCol_ScrollbarGrabActive]    = ImVec4(0.51f, 0.51f, 0.51f, 1.00f);
-        colors[ImGuiCol_CheckMark]              = ImVec4(0.11f, 0.64f, 0.92f, 1.00f);
-        colors[ImGuiCol_SliderGrab]             = ImVec4(0.11f, 0.64f, 0.92f, 1.00f);
-        colors[ImGuiCol_SliderGrabActive]       = ImVec4(0.08f, 0.50f, 0.72f, 1.00f);
-        colors[ImGuiCol_Button]                 = ImVec4(0.25f, 0.25f, 0.26f, 1.00f);
-        colors[ImGuiCol_ButtonHovered]          = ImVec4(0.38f, 0.38f, 0.39f, 1.00f);
-        colors[ImGuiCol_ButtonActive]           = ImVec4(0.67f, 0.67f, 0.67f, 0.39f);
-        colors[ImGuiCol_Header]                 = ImVec4(0.22f, 0.22f, 0.22f, 1.00f);
-        colors[ImGuiCol_HeaderHovered]          = ImVec4(0.25f, 0.25f, 0.26f, 1.00f);
-        colors[ImGuiCol_HeaderActive]           = ImVec4(0.67f, 0.67f, 0.67f, 0.39f);
-        colors[ImGuiCol_Separator]              = ImVec4(0.43f, 0.43f, 0.50f, 0.50f);
-        colors[ImGuiCol_SeparatorHovered]       = ImVec4(0.41f, 0.42f, 0.44f, 1.00f);
-        colors[ImGuiCol_SeparatorActive]        = ImVec4(0.42f, 0.42f, 0.44f, 1.00f);
-        colors[ImGuiCol_ResizeGrip]             = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
-        colors[ImGuiCol_ResizeGripHovered]      = ImVec4(0.29f, 0.30f, 0.31f, 0.67f);
-        colors[ImGuiCol_ResizeGripActive]       = ImVec4(0.26f, 0.59f, 0.98f, 0.95f);
-        colors[ImGuiCol_Tab]                    = ImVec4(0.08f, 0.08f, 0.09f, 0.83f);
-        colors[ImGuiCol_TabHovered]             = ImVec4(0.33f, 0.34f, 0.36f, 0.83f);
-        colors[ImGuiCol_TabActive]              = ImVec4(0.23f, 0.23f, 0.24f, 1.00f);
-        colors[ImGuiCol_TabUnfocused]           = ImVec4(0.08f, 0.08f, 0.09f, 0.97f);
-        colors[ImGuiCol_TabUnfocusedActive]     = ImVec4(0.13f, 0.14f, 0.15f, 1.00f);
-        colors[ImGuiCol_DockingPreview]         = ImVec4(0.26f, 0.59f, 0.98f, 0.70f);
-        colors[ImGuiCol_DockingEmptyBg]         = ImVec4(0.20f, 0.20f, 0.20f, 1.00f);
-        colors[ImGuiCol_PlotLines]              = ImVec4(0.61f, 0.61f, 0.61f, 1.00f);
-        colors[ImGuiCol_PlotLinesHovered]       = ImVec4(1.00f, 0.43f, 0.35f, 1.00f);
-        colors[ImGuiCol_PlotHistogram]          = ImVec4(0.90f, 0.70f, 0.00f, 1.00f);
-        colors[ImGuiCol_PlotHistogramHovered]   = ImVec4(1.00f, 0.60f, 0.00f, 1.00f);
-        colors[ImGuiCol_TextSelectedBg]         = ImVec4(0.26f, 0.59f, 0.98f, 0.35f);
-        colors[ImGuiCol_DragDropTarget]         = ImVec4(0.11f, 0.64f, 0.92f, 1.00f);
-        colors[ImGuiCol_NavHighlight]           = ImVec4(0.26f, 0.59f, 0.98f, 1.00f);
-        colors[ImGuiCol_NavWindowingHighlight]  = ImVec4(1.00f, 1.00f, 1.00f, 0.70f);
-        colors[ImGuiCol_NavWindowingDimBg]      = ImVec4(0.80f, 0.80f, 0.80f, 0.20f);
-        colors[ImGuiCol_ModalWindowDimBg]       = ImVec4(0.80f, 0.80f, 0.80f, 0.35f);
-
-        style.WindowPadding     = ImVec2(8, 8);
-        style.FramePadding      = ImVec2(5, 2);
-        style.CellPadding       = ImVec2(6, 4);
-        style.ItemSpacing       = ImVec2(6, 4);
-        style.ItemInnerSpacing  = ImVec2(4, 4);
-        style.IndentSpacing     = 21;
-        style.ScrollbarSize     = 14;
-        style.GrabMinSize       = 10;
-
-        style.WindowBorderSize  = 1;
-        style.ChildBorderSize   = 1;
-        style.PopupBorderSize   = 1;
-        style.FrameBorderSize   = 0;
-        style.TabBorderSize     = 0;
-
-        style.WindowRounding    = 7;
-        style.ChildRounding     = 4;
-        style.FrameRounding     = 3;
-        style.PopupRounding     = 4;
-        style.ScrollbarRounding = 9;
-        style.GrabRounding      = 3;
-        style.TabRounding       = 4;
-
-        style.WindowTitleAlign  = ImVec2(0.5f, 0.5f);
-        style.ButtonTextAlign   = ImVec2(0.5f, 0.5f);
-        style.SelectableTextAlign = ImVec2(0.0f, 0.0f);
-
-        style.DisplaySafeAreaPadding = ImVec2(3, 3);
-        
-        style.Alpha = 1.0f;
-        style.DisabledAlpha = 0.6f;
-        
-        ImGuiIO& io = ImGui::GetIO();
-        io.FontGlobalScale = 1.0f;
-    }
-
     void Window::shutdown_im_gui()
     {
         ImGui_ImplOpenGL3_Shutdown();
diff --git a/src/core/window.h b/src/core/window.h
index 8b0945f..92842ba 100644
--- a/src/core/window.h
+++ b/src/core/window.h
@@ -46,7 +46,6 @@ namespace Donut
         void shutdown();
 
         void setup_im_gui_fonts();
-        void apply_im_gui_theme();
         void shutdown_im_gui();
         
         static void glfw_error_callback(int error, const char* description);