MRColorTheme.h

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#pragma once
#include "exports.h"
#include "MRMesh/MRColor.h"
#include "MRMesh/MRSignal.h"
#include "MRPch/MRJson.h"
#include <filesystem>
#include <vector>
#include <array>
#include <optional>
 
namespace MR
{
 
// This singleton is born to manage color-themes loading and saving, and apply it to app
// It can handle scene colors (default mesh colors, etc.) and Dear ImGui colors
class ColorTheme
{
public:
    MRVIEWER_API static ColorTheme& instance();
 
    enum class Preset
    {
        Dark,
        Default = Dark,
        Light,
        Count
    };
    MRVIEWER_API static Preset getPreset();
    MRVIEWER_API static const char* getPresetName( Preset type );
 
 
    enum class Type
    {
        Default,
        User
    };
 
    MRVIEWER_API static Type getThemeType();
    MRVIEWER_API static const std::string& getThemeName();
 
    // Setup this struct
    MRVIEWER_API static void setupByTypeName( Type type, const std::string& name );
    MRVIEWER_API static void setupDefaultDark();
    MRVIEWER_API static void setupDefaultLight();
    MRVIEWER_API static void setupUserTheme( const std::string& themeName );
    // Setup this struct from serialized color-theme file
    MRVIEWER_API static void setupFromFile( const std::filesystem::path& path, Type type = Type::User );
    // Setup this struct from Json value
    MRVIEWER_API static void setupFromJson( const Json::Value& value, Type type = Type::User );
 
    // Setup this struct from current application colors, and serialize them to file
    // gets scene colors from first ObjectMesh, if it is present
    // gets active viewport background color
    MRVIEWER_API static void serializeCurrentToFile( const std::filesystem::path& path );
    // Setup this struct from current application colors, and serialize them to jsonValue
    // gets scene colors from first ObjectMesh, if it is present
    // gets active viewport background color
    MRVIEWER_API static void serializeCurrentToJson( Json::Value& root );
 
    // Applies colors stored in this struct to application
    // really some colors of this theme are applied deferred on next frame because of ImGui::PushStyleColor problem
    // note that struct should be initialized when apply is called
    // initialized in this scope means that structure has it's own values for colors
    MRVIEWER_API static void apply();
    // True if this structure is filled with colors, false if empty
    MRVIEWER_API static bool isInitialized();
 
    // Color types used in ribbon
    enum class RibbonColorsType
    {
        Background,
        BackgroundSecStyle,
        HeaderBackground,
        HeaderSeparator,
        TopPanelBackground,
 
        QuickAccessBackground,
 
        Borders,
 
        TabHovered,
        TabClicked,
        TabActive,
        TabActiveHovered,
        TabActiveClicked,
        TabText,
        TabActiveText,
 
        DialogTab,
        DialogTabHovered,
        DialogTabActive,
        DialogTabActiveHovered,
        DialogTabText,
        DialogTabActiveText,
 
        ToolbarHovered,
        ToolbarClicked,
 
        ModalBackground,
 
        Text,
        TextEnabled,
        TextDisabled,
        TextSelectedBg,
 
        RibbonButtonHovered,
        RibbonButtonClicked,
        RibbonButtonActive,
        RibbonButtonActiveHovered,
        RibbonButtonActiveClicked,
 
        ThirdpartyBackground,
        ProgressBarBackground,
        FrameBackground,
        CollapseHeaderBackground,
 
        SelectedObjectText,
        SelectedObjectFrame,
 
        GradientStart,
        GradientEnd,
 
        TextContrastBackground,
 
        GradBtnStart,
        GradBtnHoverStart,
        GradBtnActiveStart,
        GradBtnDisableStart,
        GradBtnEnd,
        GradBtnHoverEnd,
        GradBtnActiveEnd,
        GradBtnDisableEnd,
        GradBtnText,
 
        GradBtnSecStyleStart,
        GradBtnSecStyleHoverStart,
        GradBtnSecStyleActiveStart,
        GradBtnSecStyleEnd,
        GradBtnSecStyleHoverEnd,
        GradBtnSecStyleActiveEnd,
 
        Count
    };
    // Getter and setter for ribbon colors
    MRVIEWER_API static void setRibbonColor( const Color& color, RibbonColorsType type );
    MRVIEWER_API static const Color& getRibbonColor( RibbonColorsType type );
    MRVIEWER_API static const char* getRibbonColorTypeName( RibbonColorsType type );
 
    enum class ViewportColorsType
    {
        Background,
        Borders,
        Count
    };
 
    // Getter and setter for viewport colors
    MRVIEWER_API static void setViewportColor( const Color& color, ViewportColorsType type );
    MRVIEWER_API static const Color& getViewportColor( ViewportColorsType type );
    MRVIEWER_API static const char* getViewportColorTypeName( ViewportColorsType type );
 
    // Returns directory where user's custom themes are stored
    MRVIEWER_API static std::filesystem::path getUserThemesDirectory();
 
    // Find available custom themes
    MRVIEWER_API static void updateUserThemesList();
    // Return list of found custom themes
    MRVIEWER_API static std::vector<std::string> foundUserThemes();
 
    // Reset ImGui style sizes and colors, and apply menu scaling to it
    MRVIEWER_API static void resetImGuiStyle();
 
    MRVIEWER_API static boost::signals2::connection onChanged( const std::function<void()>& slot, boost::signals2::connect_position position = boost::signals2::at_back );
 
private:
    ColorTheme() = default;
    ~ColorTheme() = default;
 
 
    std::vector<Color> sceneColors_;
    Preset themePreset_ = Preset::Dark;
    std::array<Color, size_t( RibbonColorsType::Count )> newUIColors_;
    std::array<Color, size_t( ViewportColorsType::Count )> viewportColors_;
 
    Type type_{ Type::Default };
    std::string themeName_;
 
    std::vector<std::string> foundUserThemes_;
 
    using ChangedSignal = Signal<void()>;
    ChangedSignal changedSignal_;
};
 
}