ThemeManager.cpp

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/*
    MetaImGUI
    Copyright (C) 2026  A P Nicholson
 
    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 "ThemeManager.h"
 
#include <imgui.h>
 
#include <iterator>
 
namespace MetaImGUI {
 
// Initialize static member
ThemeManager::Theme ThemeManager::s_currentTheme = Theme::Modern;
 
void ThemeManager::Apply(Theme theme) {
    s_currentTheme = theme;
 
    switch (theme) {
        case Theme::Dark:
            ImGui::StyleColorsDark();
            break;
 
        case Theme::Light:
            ImGui::StyleColorsLight();
            break;
 
        case Theme::Classic:
            ImGui::StyleColorsClassic();
            break;
 
        case Theme::Modern:
            ApplyModernTheme();
            break;
    }
}
 
void ThemeManager::ApplyModernTheme() {
    // Start with light theme as base
    ImGui::StyleColorsLight();
 
    // Customize for modern clean look
    ImGuiStyle& style = ImGui::GetStyle();
    ImVec4* colors = std::data(style.Colors);
 
    // Clean light modern colors
    colors[ImGuiCol_Text] = ImVec4(0.00f, 0.00f, 0.00f, 1.00f);
    colors[ImGuiCol_TextDisabled] = ImVec4(0.60f, 0.60f, 0.60f, 1.00f);
    colors[ImGuiCol_WindowBg] = ImVec4(0.95f, 0.95f, 0.96f, 1.00f);
    colors[ImGuiCol_ChildBg] = ImVec4(0.98f, 0.98f, 0.98f, 1.00f);
    colors[ImGuiCol_PopupBg] = ImVec4(1.00f, 1.00f, 1.00f, 0.98f);
    colors[ImGuiCol_Border] = ImVec4(0.70f, 0.70f, 0.70f, 0.65f);
    colors[ImGuiCol_FrameBg] = ImVec4(1.00f, 1.00f, 1.00f, 1.00f);
    colors[ImGuiCol_FrameBgHovered] = ImVec4(0.26f, 0.59f, 0.98f, 0.20f);
    colors[ImGuiCol_FrameBgActive] = ImVec4(0.26f, 0.59f, 0.98f, 0.35f);
    colors[ImGuiCol_TitleBg] = ImVec4(0.96f, 0.96f, 0.96f, 1.00f);
    colors[ImGuiCol_TitleBgActive] = ImVec4(0.82f, 0.82f, 0.82f, 1.00f);
    colors[ImGuiCol_TitleBgCollapsed] = ImVec4(1.00f, 1.00f, 1.00f, 0.51f);
    colors[ImGuiCol_MenuBarBg] = ImVec4(0.92f, 0.92f, 0.92f, 1.00f);
    colors[ImGuiCol_ScrollbarBg] = ImVec4(0.98f, 0.98f, 0.98f, 0.53f);
    colors[ImGuiCol_ScrollbarGrab] = ImVec4(0.69f, 0.69f, 0.69f, 0.80f);
    colors[ImGuiCol_ScrollbarGrabHovered] = ImVec4(0.49f, 0.49f, 0.49f, 0.80f);
    colors[ImGuiCol_ScrollbarGrabActive] = ImVec4(0.49f, 0.49f, 0.49f, 1.00f);
    colors[ImGuiCol_CheckMark] = ImVec4(0.26f, 0.59f, 0.98f, 1.00f);
    colors[ImGuiCol_SliderGrab] = ImVec4(0.26f, 0.59f, 0.98f, 0.78f);
    colors[ImGuiCol_SliderGrabActive] = ImVec4(0.46f, 0.54f, 0.80f, 0.60f);
    colors[ImGuiCol_Button] = ImVec4(0.26f, 0.59f, 0.98f, 0.80f);
    colors[ImGuiCol_ButtonHovered] = ImVec4(0.26f, 0.59f, 0.98f, 1.00f);
    colors[ImGuiCol_ButtonActive] = ImVec4(0.06f, 0.53f, 0.98f, 1.00f);
    colors[ImGuiCol_Header] = ImVec4(0.26f, 0.59f, 0.98f, 0.31f);
    colors[ImGuiCol_HeaderHovered] = ImVec4(0.26f, 0.59f, 0.98f, 0.80f);
    colors[ImGuiCol_HeaderActive] = ImVec4(0.26f, 0.59f, 0.98f, 1.00f);
    colors[ImGuiCol_Separator] = ImVec4(0.39f, 0.39f, 0.39f, 0.62f);
    colors[ImGuiCol_SeparatorHovered] = ImVec4(0.14f, 0.44f, 0.80f, 0.78f);
    colors[ImGuiCol_SeparatorActive] = ImVec4(0.14f, 0.44f, 0.80f, 1.00f);
    colors[ImGuiCol_ResizeGrip] = ImVec4(0.26f, 0.59f, 0.98f, 0.25f);
    colors[ImGuiCol_ResizeGripHovered] = ImVec4(0.26f, 0.59f, 0.98f, 0.67f);
    colors[ImGuiCol_ResizeGripActive] = ImVec4(0.26f, 0.59f, 0.98f, 0.95f);
    colors[ImGuiCol_Tab] = ImVec4(0.76f, 0.80f, 0.84f, 0.93f);
    colors[ImGuiCol_TabHovered] = ImVec4(0.26f, 0.59f, 0.98f, 0.80f);
    colors[ImGuiCol_TabActive] = ImVec4(0.60f, 0.73f, 0.88f, 1.00f);
    colors[ImGuiCol_TabUnfocused] = ImVec4(0.92f, 0.93f, 0.94f, 0.99f);
    colors[ImGuiCol_TabUnfocusedActive] = ImVec4(0.74f, 0.82f, 0.91f, 1.00f);
    colors[ImGuiCol_PlotLines] = ImVec4(0.39f, 0.39f, 0.39f, 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, 0.45f, 0.00f, 1.00f);
    colors[ImGuiCol_TextSelectedBg] = ImVec4(0.26f, 0.59f, 0.98f, 0.35f);
    colors[ImGuiCol_DragDropTarget] = ImVec4(0.26f, 0.59f, 0.98f, 0.95f);
    colors[ImGuiCol_NavHighlight] = ImVec4(0.26f, 0.59f, 0.98f, 0.80f);
    colors[ImGuiCol_NavWindowingHighlight] = ImVec4(0.70f, 0.70f, 0.70f, 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);
 
    // Modern styling with rounded corners and borders
    style.WindowRounding = 8.0f;
    style.FrameRounding = 10.0f;
    style.ScrollbarRounding = 12.0f;
    style.GrabRounding = 10.0f;
    style.TabRounding = 8.0f;
    style.WindowBorderSize = 1.0f;
    style.FrameBorderSize = 1.0f;
    style.PopupBorderSize = 1.0f;
    style.WindowPadding = ImVec2(10.0f, 10.0f);
    style.FramePadding = ImVec2(8.0f, 4.0f);
    style.ItemSpacing = ImVec2(8.0f, 6.0f);
}
 
} // namespace MetaImGUI