Reusable UI primitives living under src/app/gui/widgets/. Each entry is a drop-in widget with a bool/commit-value return contract and no dependency on editor state — call sites own persistence and undo wiring.

Buttons

From themed_widgets.h:

• bool RippleButton(label, size, ripple_color, panel_id, anim_id) — animated click ripple.
• bool BouncyButton(label, size, ...) — scale-bounce feedback on hover/click.
• bool ThemedButton(label, size, ...) — neutral button routed through ThemeManager.
• bool PrimaryButton(label, size, ...) — theme.primary-tinted CTA.
• bool DangerButton(label, size, ...) — theme.error-tinted destructive action.
• bool SuccessButton(label, size, ...) — theme.success-tinted confirm.
• bool ThemedIconButton(icon, tooltip, size, ...) — icon-only themed button.
• bool TransparentIconButton(icon, size, tooltip) — no-chrome icon button.
• bool ToolbarIconButton(icon, tooltip, ...) / bool InlineIconButton(icon, tooltip, ...) — toolbar + text-flow variants.

Inputs

From property_inspector.h:

• bool DrawProperty(label, bool*, opts) / bool DrawProperty(label, int*, opts) — typed input widgets (bool, int, u8, u16, u32, float, double, std::string, ImVec4, Color).
• bool DrawPropertyHex(label, u8*|u16*|u32*, opts) — hex-formatted integer input with uppercase hex filter.
• bool DrawPropertyCombo<EnumT>(label, EnumT*, items, opts) — enum combo with null-terminated labels.
• PropertyOptions { min, max, step, step_fast, format, tooltip, read_only, text_flags } — clamp + formatting.

Call these inside a BeginTable("grid", 2) to get auto label/value column routing, or call inline for ImGui-default layout.

Selectors

• font_picker.h: bool FontPicker(label, int* index) — dropdown over ImGui::GetIO().Fonts->Fonts; preview renders each entry in its own face.
• icon_browser.h: const char* IconBrowser(label) — searchable grid of Material Design glyphs from the curated kCommonIcons[] catalog (6 categories × ~15 icons).
• tile_selector_widget.h: tile palette browsing + selection.
• asset_browser.h: filesystem-style asset picker.
• palette_editor_widget.h: SNES palette row/swatch editor.

Canvas

• resize_handles.h: bool ResizeHandles(ImRect*, HandleMask, snap, id, style) — 8-zone hit-tested resize affordance; returns true on drag release, mutates the rect in place during drag. Corner priority + cursor flips + min-size clamp.
• dungeon_object_emulator_preview.h: render a live SNES object preview with ArenaRom.

Layout

From themed_widgets.h:

• void PanelHeader(title, icon, show_close, on_close) — panel title bar with optional icon + close button.
• void SectionHeader(label) — mid-panel section divider with text.
• bool BeginThemedTabBar(id, flags) / void EndThemedTabBar() — themed tab group.
• void DrawCanvasHUD(label, pos, size, body_fn) — canvas overlay HUD positioned at absolute pos.

Colors

• themed_widgets.h: bool PaletteColorButton(id, SnesColor, ...) — clickable swatch for a single SNES color.
• palette_editor_widget.h: full palette row editor.

Common patterns

• Commit contract: widgets return true on the frame the user commits a change. Mid-interaction frames may mutate the pointee but return false (e.g. ResizeHandles during drag).
• Theme pickup: colors default to reading from ThemeManager::Get().GetCurrentTheme() at draw time so theme swaps take effect immediately — don't cache themed colors across frames.
• Undo integration: widgets do not post undo commands. Wrap the return value at the call site to bind into your editor's command manager.
• Internal helpers: pure-logic helpers (snap math, string matching, query parsing) live in *_internal namespaces so unit tests can exercise them without mouse input.

Text / code

• text_editor.h: multi-line syntax-highlighted editor (ImGuiColorTextEdit fork).