Method OpenProjectDialog

Engine/Editor/Source/UI/EditorUI.cpp:2534–2678

                            const ImVec2 ViewportAvail = ImGui::GetContentRegionAvail();
                            SceneRenderer->SetPrimaryViewSize(FUIntVector2(
                                (uint32)eastl::max(ViewportAvail.x, 64.0f),
                                (uint32)eastl::max(ViewportAvail.y, 64.0f)));

                            ImTextureRef ViewportTexture = ImGuiX::ToImTextureRef(SceneRenderer->GetDisplayResourceID());

                            Tool->bViewportFocused = ImGui::IsWindowFocused();
                            Tool->bViewportHovered = ImGui::IsWindowHovered();
                            Tool->UpdateViewportInput(UpdateContext);
                            Tool->DrawViewport(UpdateContext, ViewportTexture);
                        }

                        ImGui::End();
                    }
                    else
                    {
                        ImGui::SetNextWindowClass(&Tool->ToolWindowsClass);
                        ImGui::SetNextWindowSizeConstraints(ImVec2(128, 128), ImVec2(FLT_MAX, FLT_MAX));
                        ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(0, 0));
                        bool const DrawViewportWindow = ImGui::Begin(ToolWindowName.c_str(), nullptr, ViewportWindowFlags);
                        ImGui::PopStyleVar();

                        if (DrawViewportWindow)
                        {
                            IRenderScene* SceneRenderer = Tool->GetWorld()->GetRenderer();

                            // Size the scene to the panel that displays it, not the window. ImGui works in
                            // physical pixels here (Io.DisplaySize is the swapchain extent), so the content
                            // region is already the right unit. Floor matches DrawViewport's.
                            const ImVec2 ViewportAvail = ImGui::GetContentRegionAvail();
                            SceneRenderer->SetPrimaryViewSize(FUIntVector2(
                                (uint32)eastl::max(ViewportAvail.x, 64.0f),
                                (uint32)eastl::max(ViewportAvail.y, 64.0f)));

                            ImTextureRef ViewportTexture = ImGuiX::ToImTextureRef(SceneRenderer->GetDisplayResourceID());

                            Tool->bViewportFocused = ImGui::IsWindowFocused();
                            Tool->bViewportHovered = ImGui::IsWindowHovered();
                            Tool->UpdateViewportInput(UpdateContext);
                            Tool->DrawViewport(UpdateContext, ViewportTexture);
                        }

                        ImGui::End();
                    }
                }
                else
                {
                    LUMINA_PROFILE_SECTION("Draw Tool Window");

                    ImGuiWindowFlags ToolWindowFlags = ImGuiWindowFlags_NoFocusOnAppearing | ImGuiWindowFlags_NoNavFocus | ImGuiWindowFlags_NoCollapse;

                    if (Window->bDisableScrolling)
                    {
                        ToolWindowFlags |= ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoScrollWithMouse;
                    }
                    
                    ImGui::SetNextWindowClass(&Tool->ToolWindowsClass);
                    // Floor the size so a panel can't be dragged to a degenerate extent (child widgets assert at zero width).
                    ImGui::SetNextWindowSizeConstraints(ImVec2(100.0f, 80.0f), ImVec2(FLT_MAX, FLT_MAX));