RadioButton

A radio button control for mutually exclusive selection within a group. RadioButtons with the same Group value form a logical group where only one can be selected at a time.

Basic Usage

// Simple radio buttons grouped by string
new VStack()
    .AddChildren(
        new RadioButton()
            .SetText("Option A")
            .SetGroup("myGroup")
            .SetValue("A"),
        new RadioButton()
            .SetText("Option B")
            .SetGroup("myGroup")
            .SetValue("B"),
        new RadioButton()
            .SetText("Option C")
            .SetGroup("myGroup")
            .SetValue("C")
    )

// Pre-selected radio button
new RadioButton()
    .SetText("Default Choice")
    .SetGroup("choices")
    .SetIsSelected(true)

RadioButton-Specific Methods

Method	Description
`SetGroup(object)`	Sets the group identifier
`BindGroup(name, getter)`	Binds group
`SetValue(object)`	Sets the value this button represents
`BindValue(name, getter)`	Binds value
`SetIsSelected(bool)`	Sets selected state
`BindIsSelected(name, getter, setter)`	Two-way binds selected state
`SetText(string)`	Sets the label text
`BindText(name, getter)`	Binds text
`SetTextSize(float)`	Sets font size (default: 14)
`BindTextSize(name, getter)`	Binds font size
`SetTextColor(Color)`	Sets text color (default: White)
`BindTextColor(name, getter)`	Binds text color
`SetCircleColor(Color)`	Sets unselected circle color (default: White)
`BindCircleColor(name, getter)`	Binds circle color
`SetSelectedColor(Color)`	Sets selected indicator color (default: iOS green)
`BindSelectedColor(name, getter)`	Binds selected color

RadioButtons with the same Group object form an exclusive group. When one is selected, others in the group are automatically deselected.

Layout Methods

Methods inherited from UiElement:

Method	Description
`SetMargin(Margin)`	Sets outer margin
`BindMargin(name, getter)`	Binds margin
`SetHorizontalAlignment(HorizontalAlignment)`	Sets horizontal alignment
`BindHorizontalAlignment(name, getter)`	Binds horizontal alignment
`SetVerticalAlignment(VerticalAlignment)`	Sets vertical alignment
`BindVerticalAlignment(name, getter)`	Binds vertical alignment
`SetDesiredSize(Size)`	Sets explicit size
`BindDesiredSize(name, getter)`	Binds size
`SetDesiredWidth(float)`	Sets explicit width
`BindDesiredWidth(name, getter)`	Binds width
`SetDesiredHeight(float)`	Sets explicit height
`BindDesiredHeight(name, getter)`	Binds height

HorizontalAlignment Values

Value	Description
`HorizontalAlignment.Undefined`	Default behavior
`HorizontalAlignment.Left`	Align to left
`HorizontalAlignment.Center`	Center horizontally
`HorizontalAlignment.Right`	Align to right
`HorizontalAlignment.Stretch`	Stretch to fill width

VerticalAlignment Values

Value	Description
`VerticalAlignment.Undefined`	Default behavior
`VerticalAlignment.Top`	Align to top
`VerticalAlignment.Center`	Center vertically
`VerticalAlignment.Bottom`	Align to bottom
`VerticalAlignment.Stretch`	Stretch to fill height

Appearance Methods

Methods inherited from UiElement:

Method	Description
`SetIsVisible(bool)`	Shows/hides element
`BindIsVisible(name, getter)`	Binds visibility
`SetOpacity(float)`	Sets opacity 0.0-1.0 (default: 1.0)
`BindOpacity(name, getter)`	Binds opacity
`SetBackground(IBackground)`	Sets background (gradient, solid, etc.)
`SetBackground(Color)`	Sets solid color background
`BindBackground(name, getter)`	Binds background
`SetCornerRadius(float)`	Sets corner radius
`BindCornerRadius(name, getter)`	Binds corner radius
`SetVisualOffset(Point)`	Offsets visual position
`BindVisualOffset(name, getter)`	Binds visual offset

Shadow Methods

Methods inherited from UiElement:

Method	Description
`SetShadowColor(Color)`	Sets shadow color
`BindShadowColor(name, getter)`	Binds shadow color
`SetShadowOffset(Point)`	Sets shadow offset
`BindShadowOffset(name, getter)`	Binds shadow offset
`SetShadowBlur(float)`	Sets shadow blur radius
`BindShadowBlur(name, getter)`	Binds shadow blur
`SetShadowSpread(float)`	Sets shadow spread
`BindShadowSpread(name, getter)`	Binds shadow spread

Focus Methods

Methods inherited from UiElement:

Method	Description
`SetTabIndex(int?)`	Sets tab order (null = auto)
`BindTabIndex(name, getter)`	Binds tab index
`SetTabStop(bool)`	Include in tab navigation (default: true)
`BindTabStop(name, getter)`	Binds tab stop
`SetFocusRingColor(Color)`	Sets focus ring color
`SetFocusRingWidth(float)`	Sets focus ring stroke width
`SetFocusRingOffset(float)`	Sets focus ring offset from bounds
`SetFocusedBackground(IBackground)`	Sets background when focused
`SetFocusedBackground(Color)`	Sets solid background when focused
`SetFocusedBorderColor(Color?)`	Sets border color when focused

RadioButton is focusable by default (IsFocusable = true).

Accessibility Methods

Methods inherited from UiElement:

Method	Description
`SetAccessibilityLabel(string?)`	Sets screen reader label
`BindAccessibilityLabel(name, getter)`	Binds accessibility label
`SetAccessibilityHint(string?)`	Sets additional context hint
`BindAccessibilityHint(name, getter)`	Binds accessibility hint
`SetAccessibilityValue(string?)`	Sets current value description
`BindAccessibilityValue(name, getter)`	Binds accessibility value
`SetAccessibilityTraits(AccessibilityTrait)`	Sets accessibility traits
`BindAccessibilityTraits(name, getter)`	Binds accessibility traits
`AddAccessibilityTraits(AccessibilityTrait)`	Adds traits to existing
`RemoveAccessibilityTraits(AccessibilityTrait)`	Removes specific traits
`SetIsAccessibilityElement(bool)`	Include in accessibility tree
`SetHighContrastBackground(IBackground)`	Background for high contrast mode
`SetHighContrastBackground(Color)`	Solid background for high contrast
`SetHighContrastForeground(Color)`	Text color for high contrast mode
`SetEnforceMinimumTouchTarget(bool)`	Enforce 44x44 minimum size

RadioButton has AccessibilityRole.RadioButton by default. The accessibility value automatically reflects “Selected” or “Not selected” state.

Extension methods available on all UiElement:

Method	Description
`SetTooltip(string)`	Sets tooltip text
`SetTooltip(UiElement)`	Sets tooltip with custom content
`SetTooltip(Action<TooltipAttachment>)`	Configures tooltip via builder
`SetTooltipPlacement(TooltipPlacement)`	Sets tooltip position
`SetTooltipShowDelay(int)`	Sets show delay in ms
`SetTooltipHideDelay(int)`	Sets hide delay in ms
`BindTooltipContent(name, getter)`	Binds tooltip content
`BindTooltipPlacement(name, getter)`	Binds tooltip placement
`BindTooltipShowDelay(name, getter)`	Binds show delay
`BindTooltipHideDelay(name, getter)`	Binds hide delay

Extension methods available on all UiElement:

Method	Description
`SetContextMenu(ContextMenu)`	Sets context menu
`SetContextMenu(Action<ContextMenu>)`	Configures context menu via builder
`SetContextMenuBackground(IBackground)`	Sets menu background
`SetContextMenuBackground(Color)`	Sets menu background color
`SetContextMenuHoverBackgroundColor(Color)`	Sets hover color
`SetContextMenuTextColor(Color)`	Sets menu text color
`BindContextMenuBackground(name, getter)`	Binds menu background
`BindContextMenuHoverBackgroundColor(name, getter)`	Binds hover color
`BindContextMenuTextColor(name, getter)`	Binds text color

Other Methods

Method	Description
`IgnoreStyling()`	Prevents global styles from being applied
`SetDebug(bool)`	Shows debug bounds (red border)

Examples

Radio Button Group with String Grouping

new VStack()
    .AddChildren(
        new Label().SetText("Select size:").SetFontWeight(FontWeight.SemiBold).SetMargin(new Margin(0, 0, 0, 12)),
        new RadioButton()
            .SetText("Small")
            .SetGroup("size")
            .SetValue("small")
            .SetIsSelected(true)
            .SetMargin(new Margin(0, 0, 0, 12)),
        new RadioButton()
            .SetText("Medium")
            .SetGroup("size")
            .SetValue("medium")
            .SetMargin(new Margin(0, 0, 0, 12)),
        new RadioButton()
            .SetText("Large")
            .SetGroup("size")
            .SetValue("large")
    )

Styled Radio Buttons

new RadioButton()
    .SetText("Premium Option")
    .SetGroup("plan")
    .SetTextColor(new Color(200, 200, 200))
    .SetTextSize(16)
    .SetCircleColor(new Color(100, 100, 100))
    .SetSelectedColor(new Color(0, 122, 255))

Data-bound Radio Buttons

new VStack()
    .AddChildren(
        new RadioButton()
            .SetText("Light Theme")
            .SetGroup("theme")
            .SetValue(Theme.Light)
            .BindIsSelected(nameof(vm.IsLightTheme),
                () => vm.Theme == Theme.Light,
                v => { if (v) vm.Theme = Theme.Light; }),
        new RadioButton()
            .SetText("Dark Theme")
            .SetGroup("theme")
            .SetValue(Theme.Dark)
            .BindIsSelected(nameof(vm.IsDarkTheme),
                () => vm.Theme == Theme.Dark,
                v => { if (v) vm.Theme = Theme.Dark; })
    )

Accessible Radio Group

new VStack()
    .AddChildren(
        new RadioButton()
            .SetText("Monthly")
            .SetGroup("billing")
            .SetAccessibilityLabel("Monthly billing")
            .SetAccessibilityHint("Select for monthly payments"),
        new RadioButton()
            .SetText("Annual (20% off)")
            .SetGroup("billing")
            .SetAccessibilityLabel("Annual billing with 20% discount")
            .SetAccessibilityHint("Select for yearly payments with savings")
    )

RadioButton

Basic Usage

RadioButton-Specific Methods

Layout Methods

HorizontalAlignment Values

VerticalAlignment Values

Appearance Methods

Shadow Methods

Focus Methods

Accessibility Methods

Tooltip Methods

Context Menu Methods

Other Methods

Examples

Radio Button Group with String Grouping

Styled Radio Buttons

Data-bound Radio Buttons

Accessible Radio Group