icon

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 Go to latest Published: Mar 16, 2026 License: MIT Imports: 6 Imported by: 0

Documentation

Overview

Package icon provides a vector path icon system for the gogpu/ui toolkit.

Icons are defined as sequences of path commands (MoveTo, LineTo, CubicTo, Close) within a square viewbox (typically 24x24). The system scales icons to fit any display size while maintaining crisp stroked lines.

Built-in Icons

The package includes common Material-style icons as package-level variables:

Custom Icons

Define custom icons by constructing IconData with a slice of PathOp: 

star := icon.IconData{
    Name:    "star",
    ViewBox: 24,
    Ops: []icon.PathOp{
        icon.Move(12, 2),
        icon.Line(15, 9),
        icon.Line(22, 9),
        // ... more ops
        icon.ClosePath(),
    },
}

Widget

Use NewIcon to create a display widget: 

w := icon.NewIcon(icon.Check, icon.Size(32), icon.Color(widget.ColorGreen))

Direct Drawing

Use Draw to render an icon directly to a canvas: 

icon.Draw(canvas, icon.Settings, bounds, widget.ColorBlack)

Index

Constants

This section is empty.

Variables

View Source 
var Add = IconData{
	Name:    "add",
	ViewBox: defaultViewBox,
	Ops: []PathOp{
		Move(12, 5), Line(12, 19),
		Move(5, 12), Line(19, 12),
	},
}

Add is a plus icon.

View Source 
var ArrowBack = IconData{
	Name:    "arrow_back",
	ViewBox: defaultViewBox,
	Ops: []PathOp{
		Move(20, 12), Line(4, 12),
		Move(4, 12), Line(10, 6),
		Move(4, 12), Line(10, 18),
	},
}

ArrowBack is a left-pointing arrow.

View Source 
var Check = IconData{
	Name:    "check",
	ViewBox: defaultViewBox,
	Ops: []PathOp{
		Move(5, 12), Line(10, 17), Line(19, 7),
	},
}

Check is a checkmark icon.

View Source 
var ChevronDown = IconData{
	Name:    "chevron_down",
	ViewBox: defaultViewBox,
	Ops: []PathOp{
		Move(7, 9), Line(12, 14), Line(17, 9),
	},
}

ChevronDown is a downward-pointing chevron.

View Source 
var ChevronRight = IconData{
	Name:    "chevron_right",
	ViewBox: defaultViewBox,
	Ops: []PathOp{
		Move(9, 7), Line(14, 12), Line(9, 17),
	},
}

ChevronRight is a right-pointing chevron.

View Source 
var Close = IconData{
	Name:    "close",
	ViewBox: defaultViewBox,
	Ops: []PathOp{
		Move(6, 6), Line(18, 18),
		Move(18, 6), Line(6, 18),
	},
}

Close is an X mark icon (two diagonal lines).

View Source 
var Delete = IconData{
	Name:    "delete",
	ViewBox: defaultViewBox,
	Ops: []PathOp{

		Move(5, 7), Line(19, 7),
		Move(9, 7), Line(9, 5), Line(15, 5), Line(15, 7),

		Move(7, 7), Line(8, 19), Line(16, 19), Line(17, 7),

		Move(10, 9), Line(10, 17),
		Move(12, 9), Line(12, 17),
		Move(14, 9), Line(14, 17),
	},
}

Delete is a simplified trash can icon.

View Source 
var Menu = IconData{
	Name:    "menu",
	ViewBox: defaultViewBox,
	Ops: []PathOp{
		Move(4, 7), Line(20, 7),
		Move(4, 12), Line(20, 12),
		Move(4, 17), Line(20, 17),
	},
}

Menu is a hamburger menu icon (three horizontal lines).

View Source 
var Search = IconData{
	Name:    "search",
	ViewBox: defaultViewBox,
	Ops: []PathOp{

		Move(15.5, 10),
		Line(14.9, 12.4), Line(12.9, 14.2), Line(10.5, 14.7),
		Line(8.1, 14.2), Line(6.1, 12.4), Line(5.5, 10),
		Line(6.1, 7.6), Line(8.1, 5.8), Line(10.5, 5.3),
		Line(12.9, 5.8), Line(14.9, 7.6), Line(15.5, 10),

		Move(14, 14), Line(19, 19),
	},
}

Search is a magnifying glass icon.

View Source 
var Settings = IconData{
	Name:    "settings",
	ViewBox: defaultViewBox,
	Ops: []PathOp{

		Move(12, 3), Line(14, 5), Line(16, 5), Line(19, 8),
		Line(19, 10), Line(21, 12), Line(19, 14), Line(19, 16),
		Line(16, 19), Line(14, 19), Line(12, 21), Line(10, 19),
		Line(8, 19), Line(5, 16), Line(5, 14), Line(3, 12),
		Line(5, 10), Line(5, 8), Line(8, 5), Line(10, 5),
		ClosePath(),

		Move(14, 12), Line(13.4, 13.4), Line(12, 14),
		Line(10.6, 13.4), Line(10, 12), Line(10.6, 10.6),
		Line(12, 10), Line(13.4, 10.6), Line(14, 12),
	},
}

Settings is a simplified gear icon.

Functions

func Draw 

func Draw(canvas widget.Canvas, data IconData, bounds geometry.Rect, color widget.Color)

Draw renders an icon's path operations onto the canvas within the given bounds, using the specified color.

The icon is uniformly scaled to fit the bounds while preserving aspect ratio (the viewbox is square). The stroke width scales proportionally.

Draw can be called directly for custom rendering, or is used internally by IconWidget.

Types

type Command 

type Command uint8

Command identifies a path drawing operation within an icon definition. 

const (
	// CmdMoveTo moves the current point without drawing. Params: [x, y].
	CmdMoveTo Command = iota

	// CmdLineTo draws a straight line from the current point. Params: [x, y].
	CmdLineTo

	// CmdCubicTo draws a cubic Bezier curve. Params: [cx1, cy1, cx2, cy2, x, y].
	CmdCubicTo

	// CmdClose closes the current sub-path by drawing a line back to the
	// starting point of the sub-path. Params: unused.
	CmdClose
)

func (Command) String 

func (c Command) String() string

String returns a human-readable name for the command.

type IconData 

type IconData struct {
	// Name is a human-readable identifier for the icon (e.g. "close", "check").
	Name string

	// ViewBox is the side length of the square coordinate space in which the
	// path operations are defined. Typical value is 24 (Material Design).
	ViewBox float32

	// Ops is the ordered sequence of path operations that define the icon shape.
	Ops []PathOp
}

IconData defines a vector icon as a sequence of path operations within a square viewbox.

IconData is a value type: it is safe to copy, compare by name, and store in maps. The Ops slice is shared between copies; callers must not mutate the slice after constructing the IconData.

type IconOption 

type IconOption func(*iconConfig)

IconOption configures an IconWidget.

func Color 

func Color(color widget.Color) IconOption

Color sets the icon stroke color.

func ColorSignal 

func ColorSignal(sig state.ReadonlySignal[widget.Color]) IconOption

ColorSignal binds the icon color to a reactive signal. When set, the signal value takes precedence over Color.

func Label 

func Label(text string) IconOption

Label sets the accessibility label for the icon.

func Size 

func Size(s float32) IconOption

Size sets the display size of the icon in logical pixels. The icon is rendered as a square of side length s.

type IconWidget 

type IconWidget struct {
	widget.WidgetBase
	// contains filtered or unexported fields
}

IconWidget is a display widget that renders a vector icon.

IconWidget implements widget.Widget and a11y.Accessible.

Create an IconWidget with NewIcon.

func NewIcon 

func NewIcon(data IconData, opts ...IconOption) *IconWidget

NewIcon creates a new icon widget displaying the given icon data. 

w := icon.NewIcon(icon.Check, icon.Size(32), icon.Color(widget.ColorGreen))

func (*IconWidget) AccessibilityActions 

func (w *IconWidget) AccessibilityActions() []a11y.Action

AccessibilityActions returns nil. Icons have no actions.

func (*IconWidget) AccessibilityHint 

func (w *IconWidget) AccessibilityHint() string

AccessibilityHint returns an empty string.

func (*IconWidget) AccessibilityLabel 

func (w *IconWidget) AccessibilityLabel() string

AccessibilityLabel returns the icon's accessibility label. Falls back to the icon name if no label was set.

func (*IconWidget) AccessibilityRole 

func (w *IconWidget) AccessibilityRole() a11y.Role

AccessibilityRole returns a11y.RoleImage.

func (*IconWidget) AccessibilityState 

func (w *IconWidget) AccessibilityState() a11y.State

AccessibilityState returns the default accessibility state.

func (*IconWidget) AccessibilityValue 

func (w *IconWidget) AccessibilityValue() string

AccessibilityValue returns an empty string.

func (*IconWidget) Children 

func (w *IconWidget) Children() []widget.Widget

Children returns nil. Icon is a leaf widget.

func (*IconWidget) Data 

func (w *IconWidget) Data() IconData

Data returns the icon data being displayed.

func (*IconWidget) Draw 

func (w *IconWidget) Draw(_ widget.Context, canvas widget.Canvas)

Draw renders the icon to the canvas.

func (*IconWidget) Event 

func (w *IconWidget) Event(_ widget.Context, _ event.Event) bool

Event returns false. Icon widgets do not consume events.

func (*IconWidget) IconColor 

func (w *IconWidget) IconColor() widget.Color

IconColor returns the resolved icon color.

Resolution priority: ColorSignal > Color.

func (*IconWidget) IconLabel 

func (w *IconWidget) IconLabel() string

IconLabel returns the accessibility label.

func (*IconWidget) IconSize 

func (w *IconWidget) IconSize() float32

IconSize returns the display size in logical pixels.

func (*IconWidget) Layout 

func (w *IconWidget) Layout(_ widget.Context, constraints geometry.Constraints) geometry.Size

Layout returns the icon's preferred size (a square of side [IconSize]).

func (*IconWidget) Mount 

func (w *IconWidget) Mount(ctx widget.Context)

Mount creates signal bindings for push-based invalidation.

func (*IconWidget) Unmount 

func (w *IconWidget) Unmount()

Unmount is called when the icon widget is removed from the widget tree.

type PathOp 

type PathOp struct {
	Cmd    Command
	Params [maxParams]float32
}

PathOp is a single drawing operation in an icon's path definition.

The number of significant parameters depends on the command:

func ClosePath 

func ClosePath() PathOp

ClosePath creates a Close path operation.

func Cubic 

func Cubic(cx1, cy1, cx2, cy2, x, y float32) PathOp

Cubic creates a CubicTo path operation with control points (cx1, cy1), (cx2, cy2) and endpoint (x, y).

func Line 

func Line(x, y float32) PathOp

Line creates a LineTo path operation.

func Move 

func Move(x, y float32) PathOp

Move creates a MoveTo path operation.

type Registry 

type Registry struct {
	// contains filtered or unexported fields
}

Registry is a thread-safe named icon registry.

Use DefaultRegistry to access the global registry, which is pre-populated with all built-in icons. Create a custom registry with NewRegistry for isolated icon sets.

func DefaultRegistry 

func DefaultRegistry() *Registry

DefaultRegistry returns the global icon registry.

The default registry is pre-populated with all built-in icons. Additional icons can be registered at any time using Registry.Register.

func NewRegistry 

func NewRegistry() *Registry

NewRegistry creates an empty icon registry.

func (*Registry) Get 

func (r *Registry) Get(name string) (IconData, bool)

Get returns the icon with the given name and true if found, or a zero IconData and false otherwise.

func (*Registry) Len 

func (r *Registry) Len() int

Len returns the number of icons in the registry.

func (*Registry) Names 

func (r *Registry) Names() []string

Names returns all registered icon names in no particular order.

func (*Registry) Register 

func (r *Registry) Register(icon IconData)

Register adds an icon to the registry, keyed by its Name field.

If an icon with the same name already exists, it is replaced.

Source Files

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