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UsdLayerManager/openspec/changes/archive/2026-05-08-make-imgui-widge.../proposal.md

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Why

All ImGui windows are fixed-position, fixed-size, and non-dockable, forcing users into a rigid layout that cannot adapt to different screen sizes, workflows, or preferences. Enabling ImGui's built-in docking system allows users to freely arrange, resize, tab, and float panels to suit their workflow — a critical UX feature for any editor application.

What Changes

  • Enable ImGui docking by defining IMGUI_HAS_DOCK at compile time via CMake
  • Set ImGuiConfigFlags_DockingEnable in the ImGui IO config flags
  • Create a full-window dockspace in the main render loop
  • Replace hardcoded SetNextWindowPos/SetNextWindowSize calls with dockable window creation
  • Remove manual positioning logic for all panels (Scene Hierarchy, Layer Panel, Viewport, Property Panel, Stage Info)
  • Preserve window visibility toggles (Stage Info, Demo Window) via the View menu
  • Ensure dock layout persists across sessions via imgui.ini

Capabilities

New Capabilities

  • imgui-docking: Main application dock space with draggable, resizable, and tabbable panels. Includes compile-time docking enablement, runtime dockspace creation, and panel migration from fixed-position to dock-based layout.

Modified Capabilities

Impact

  • CMake: FindImgui.cmake — add IMGUI_HAS_DOCK compile definition
  • imconfig.h: May need to ensure docking macros are uncommented (or rely on CMake define)
  • ImGuiContext.cpp: Add ImGuiConfigFlags_DockingEnable to IO config flags in Initialize()
  • Application.cpp: Add dockspace creation at the start of RenderUI(), remove all SetNextWindowPos/SetNextWindowSize calls from panel rendering
  • All panel windows: No API changes — windows remain compatible with docking as-is