wip: moving backend-related stuff out of the app logic

src/gui/ui_manager.cpp

@@ -0,0 +1,71 @@
+#include "gui/ui_manager.hpp"
+#include "gui/backend/backend.hpp"
+
+#include <imgui.h>
+
+namespace clrsync::gui
+{
+ui_manager::ui_manager(backend::backend_interface* backend)
+    : m_backend(backend)
+{
+}
+
+ui_manager::~ui_manager()
+{
+    shutdown();
+}
+
+bool ui_manager::initialize(const ui_config& config)
+{
+    IMGUI_CHECKVERSION();
+    m_imgui_context = ImGui::CreateContext();
+    if (!m_imgui_context)
+    {
+        return false;
+    }
+
+    ImGuiIO& io = ImGui::GetIO();
+    
+    if (config.enable_docking)
+        io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;
+    
+    if (config.enable_keyboard_nav)
+        io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
+    
+    if (!config.ini_path.empty())
+        io.IniFilename = config.ini_path.c_str();
+
+    ImGui::StyleColorsDark();
+
+    if (!m_backend->init_imgui_backend())
+    {
+        ImGui::DestroyContext(static_cast<ImGuiContext*>(m_imgui_context));
+        m_imgui_context = nullptr;
+        return false;
+    }
+
+    return true;
+}
+
+void ui_manager::shutdown()
+{
+    if (m_imgui_context)
+    {
+        m_backend->shutdown_imgui_backend();
+        ImGui::DestroyContext(static_cast<ImGuiContext*>(m_imgui_context));
+        m_imgui_context = nullptr;
+    }
+}
+
+void ui_manager::begin_frame()
+{
+    m_backend->imgui_new_frame();
+    ImGui::NewFrame();
+}
+
+void ui_manager::end_frame()
+{
+    ImGui::Render();
+    m_backend->imgui_render_draw_data(ImGui::GetDrawData());
+}
+}