Godot UI

Godot UI — Control Nodes, Themes & Layout

All examples target Godot 4.3+ with no deprecated APIs; GDScript first, then C#.

Related skills: responsive-ui for multi-resolution scaling, hud-system for in-game HUD patterns, dialogue-system for dialogue UI presentation, tween-animation for UI transition and animation effects.

1. Control Node Hierarchy

How Control Differs from Node2D

Control is the base class for all UI nodes — it lives in a separate scene-tree branch from Node2D/Node3D with a fundamentally different layout model.

Control as Base Class

Every UI widget (Button, Label, LineEdit, etc.) extends Control. Key properties defined on Control itself:

• anchor_left, anchor_top, anchor_right, anchor_bottom — fractional values (0.0–1.0) relative to the parent rect
• offset_left, offset_top, offset_right, offset_bottom — pixel offsets applied after the anchor resolves
• size_flags_horizontal, size_flags_vertical — how the node participates in Container layout
• theme — a Theme resource; if null, walks up the tree to the nearest ancestor with one
• focus_mode — whether the node can receive keyboard/gamepad focus

Place UI nodes inside a CanvasLayer (or directly under the scene root's built-in canvas) so they render on top of the 3D/2D world, unaffected by Camera transforms.

⚠️ Changed in Godot 4.7: Control.accessibility_live changed type from DisplayServer.AccessibilityLiveMode to AccessibilityServer.AccessibilityLiveMode (LIVE_OFF = 0 default, LIVE_POLITE, LIVE_ASSERTIVE) — accessibility enums/APIs moved to the new AccessibilityServer singleton. GDScript-compatible; breaks C# binary/source compatibility (rebuild against the new enum). See the 4.7 migration guide.

2. Common Container Nodes

Sizing tips:

• Set size_flags_horizontal = SIZE_EXPAND_FILL on children that should fill available space.
• Use custom_minimum_size to prevent a child from collapsing to zero.
• MarginContainer reads margin from the theme property margin_*; override at runtime with add_theme_constant_override("margin_left", 16).

Godot 4.7+: custom_maximum_size (Vector2(-1, -1)) caps size per axis, prioritized over custom_minimum_size; propagate_maximum_size (default false) makes a parent's maximum constrain its Control children; _get_maximum_size() computes maximums from code.

⚠️ Changed in Godot 4.7: TabContainer.all_tabs_in_front is deprecated — it does nothing now, since tabs are always in front. Remove code that sets it. See GH-118623.

3. Anchors & Margins

How Anchor Presets Work

An anchor is a point on the parent rect expressed as a fraction (0 = top/left edge, 1 = bottom/right edge). Godot resolves the final pixel position of each edge as:

final_left   = parent_width  * anchor_left   + offset_left
final_top    = parent_height * anchor_top    + offset_top
final_right  = parent_width  * anchor_right  + offset_right
final_bottom = parent_height * anchor_bottom + offset_bottom

The editor exposes built-in presets:

Setting Anchors in Code

Anchors resolve as parent_size * anchor + offset per edge, so setting them by hand means setting eight properties. set_anchors_and_offsets_preset(Control.PRESET_*) does it in one call — use that, then adjust offset_* for margins (negative on right/bottom).

The anchor-vs-offset rule (keep offsets at 0 and let anchors do the work) plus full GDScript + C# examples — full-rect fill, top-right HUD with 16 px margins, and a custom half-screen side panel: references/anchors-in-code.md

4. Theme System

A Theme resource centralizes fonts, colors, and StyleBoxes. Apply at the root and let inheritance do the work; use theme_override_* only for one-off tweaks. StyleBoxFlat covers most flat-design needs (bg_color, border_color, corner_radius, border_width); StyleBoxTexture for textures.

See references/theme-system.md for the full Theme resource creation walk-through, StyleBoxFlat properties, font overrides, theme inheritance rules, and per-node theme_override_* methods.

Godot 4.7+: GradientTexture2D's Fill enum gains FILL_CONIC — colors interpolated in a cone (angular) pattern; radial progress/cooldown indicators without a shader (C#: FillEnum.Conic).

5. Focus & Navigation

Focus modes (FOCUS_NONE, FOCUS_CLICK, FOCUS_ALL) gate keyboard/gamepad navigation. Wire chains with focus_neighbor_top / _bottom / _left / _right, or rely on automatic spatial detection. Call grab_focus() on the first interactive element when a menu opens.

See references/focus-and-navigation.md for focus mode details, focus_neighbor chain examples, gamepad/keyboard input handling, and grab_focus patterns.

6. Common UI Patterns

Three canonical scenes: a main menu (centered VBoxContainer with title + button list), a settings screen with tabs (TabContainer + child panels per category), and a pause menu overlay (full-rect ColorRect background + centered options panel, paused via get_tree().paused = true).

See references/ui-patterns.md for the full scene-tree fragments and GDScript wiring for each pattern.

Godot 4.7+: offset_transform_* — visual-only UI-juice transform (shake/pulse) that never re-triggers container layout; _get_cursor_shape(at_position) — per-position cursor shapes; PopupMenu search bar (search_bar_enabled, fuzzy by default) plus set_item_index() for reordering; TextureRect STRETCH_TILE now tiles AtlasTextures (only non-zero margin unsupported). Code: references/ui-patterns.md.

⚠️ Changed in Godot 4.7: RichTextLabel.add_image() / update_image() sizing was reworked — width/height are now float; width_in_percent/height_in_percent bools become width_unit/height_unit, taking the new ImageUnit enum (IMAGE_UNIT_PIXEL, IMAGE_UNIT_PERCENT, IMAGE_UNIT_EM — em scales with font size). ImageUpdateMask.UPDATE_WIDTH_IN_PERCENT is renamed UPDATE_WIDTH_UNIT, breaking GDScript using the old name. See the 4.7 migration guide.

7. Signals

Button.pressed for clicks, Control.gui_input for raw events on a node, Control.mouse_entered / mouse_exited for hover. Connect in _ready() or via the Inspector's Node panel.

See references/signals.md for the complete signal catalog and signal-driven UI update patterns.

8. FoldableContainer (Godot 4.5+)

FoldableContainer is a built-in accordion Container added in Godot 4.5 — a toggle header plus collapsible children, replacing the old boilerplate of wiring a Button to show/hide a VBoxContainer. Set title, set folded for the initial state, add children normally, and listen to folding_changed(is_folded).

Full GDScript + C# construction, the key-properties table, and the toggle signal: references/foldable-container.md

9. Stacked Label Effects (Godot 4.5+)

Godot 4.5 lets Label and RichTextLabel layer multiple text effects simultaneously — e.g., stacking two outline effects at different widths/colors, or combining a shadow with a glow. Previously, multiple outline layers required duplicating and manually layering Label nodes.

# Configure via Theme Overrides → Constants in the inspector, or add_theme_* overrides at runtime.
func apply_stacked_outlines(label: Label) -> void:
    # Outer outline — wide, dark
    label.add_theme_constant_override("outline_size", 6)
    label.add_theme_color_override("font_outline_color", Color(0.0, 0.0, 0.0, 0.9))

    # Shadow (second layered effect)
    label.add_theme_constant_override("shadow_offset_x", 2)
    label.add_theme_constant_override("shadow_offset_y", 2)
    label.add_theme_color_override("font_shadow_color", Color(0.0, 0.0, 0.0, 0.5))

public void ApplyStackedOutlines(Label label)
{
    // Outer outline — wide, dark
    label.AddThemeConstantOverride("outline_size", 6);
    label.AddThemeColorOverride("font_outline_color", new Color(0f, 0f, 0f, 0.9f));

    // Shadow (second layered effect)
    label.AddThemeConstantOverride("shadow_offset_x", 2);
    label.AddThemeConstantOverride("shadow_offset_y", 2);
    label.AddThemeColorOverride("font_shadow_color", new Color(0f, 0f, 0f, 0.5f));
}

For RichTextLabel, stacked effects can also be applied via BBCode combined with theme overrides:

# Multiple outline-style effects via BBCode + theme
$RichTextLabel.text = "[outline size=4 color=#000000]Level Up![/outline]"
# Additional layers via theme overrides, as above.

Editor workflow: Configure stacked effects via Theme Editor → Label → Constants, or add multiple FontFile-style outline passes in the Font resource. The runtime API (add_theme_*_override) above covers dynamic scenarios.

10. Checklist

• Root UI Control has anchor preset Full Rect (or appropriate preset for the layout)
• All interactive widgets (Button, LineEdit, Slider) have focus_mode = FOCUS_ALL
• Decorative nodes (Label, TextureRect) have focus_mode = FOCUS_NONE
• Focus neighbours wired for non-linear layouts so gamepad navigation wraps correctly
• grab_focus() called on the first interactive widget in _ready() for each screen
• Pause menu root Control has process_mode = PROCESS_MODE_ALWAYS
• One Theme resource assigned at the screen root — not duplicated on every child
• StyleBoxFlat used instead of image assets for simple solid-colour panels
• add_theme_*_override() used for per-node overrides rather than assigning a whole new Theme
• Containers (VBoxContainer, HBoxContainer, etc.) used for layout instead of manual position values
• custom_minimum_size set on widgets that must not collapse to zero
• Slider and volume code uses linear_to_db / db_to_linear — not raw linear values mapped to audio bus
• Signals connected in _ready() (or via the editor); no polling of UI state in _process
• Tab order in TabContainer matches logical reading / navigation order
• Accordion-style collapsible panels use FoldableContainer instead of manual Button + VBoxContainer wiring (Godot 4.5+)
• Multiple outline/shadow layers on Label/RichTextLabel use stacked theme overrides instead of duplicated nodes (Godot 4.5+)