imgui_layer.h

#pragma once
 
#include "pixelbullet/application/layer.h"
 
#include <imgui.h>
 
#include <array>
#include <cstdint>
#include <filesystem>
#include <memory>
#include <string_view>
 
namespace pixelbullet
{
class Graphics;
class ImGuiLayer;
class RenderFrameContext;
class Window;
} // namespace pixelbullet
 
namespace pixelbullet::application_internal
{
class ImGuiTextureIntegrationAccess;
} // namespace pixelbullet::application_internal
 
namespace pixelbullet
{
 
struct ImGuiAppearanceConfig
{
    std::array<ImVec4, ImGuiCol_COUNT> colors{};
    ImGuiStyle base_style{};
    std::filesystem::path font_path;
    float font_size_pixels = 13.0f;
    std::filesystem::path icon_font_path;
    float icon_font_size_pixels = 13.0f;
    ImWchar icon_font_range_min = 0;
    ImWchar icon_font_range_max = 0;
    std::filesystem::path mono_font_path;
    float mono_font_size_pixels = 13.0f;
    float style_scale = 1.0f;
};
 
class ImGuiLayer : public Layer, public UiFrameLayer
{
public:
    ImGuiLayer(Window& window, Graphics& graphics);
    ImGuiLayer(Window& window, Graphics& graphics, std::filesystem::path settings_path);
    ~ImGuiLayer();
 
    virtual void OnAttach() override;
    virtual void OnDetach() override;
    virtual pixelbullet::core::EventResult OnEvent(pixelbullet::core::Event& e) override;
 
    bool BeginUiFrame() override;
    void CancelUiFrame() override;
 
    bool Begin();
    void CancelFrame();
    void End(const RenderFrameContext& frame_context);
    ImTextureID GetRenderTargetTexture(std::string_view name);
 
    void BlockEvents(bool block);
 
    void SetAppearance(const ImGuiAppearanceConfig& appearance);
    void SetTheme();
    void SetSettingsPath(std::filesystem::path settings_path);
    void ClearSettings();
    void LoadSettingsFromDisk(const std::filesystem::path& settings_path);
    void SaveSettings();
    void SaveSettingsToDisk(const std::filesystem::path& settings_path);
 
    uint32_t GetActiveWidgetID() const;
    ImFont* GetMonospaceFont() const noexcept;
 
private:
    friend class pixelbullet::application_internal::ImGuiTextureIntegrationAccess;
 
    struct Impl;
    std::unique_ptr<Impl> impl_;
};
 
} // namespace pixelbullet