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Radio button

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This commit is contained in:
David H. Friedel Jr.
2026-01-16 04:56:23 +00:00
parent 271f8d7fa9
commit f263ee96b3
2 changed files with 305 additions and 58 deletions
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2
Handlers/RadioButtonHandler.cs
View File

@@ -80,7 +80,7 @@ public partial class RadioButtonHandler : ViewHandler<IRadioButton, SkiaRadioBut
if (radioButton.TextColor is not null)
{
handler.PlatformView.TextColor = radioButton.TextColor.ToSKColor();
handler.PlatformView.TextColor = radioButton.TextColor;
}
}

361
Views/SkiaRadioButton.cs
View File

@@ -1,149 +1,320 @@
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using System.Collections.Generic;
using Microsoft.Maui.Controls;
using Microsoft.Maui.Graphics;
using SkiaSharp;
namespace Microsoft.Maui.Platform;
/// <summary>
/// Skia-rendered radio button control with full XAML styling support.
/// Skia-rendered radio button control with full MAUI compliance.
/// Implements IRadioButton interface requirements:
/// - IsChecked property with CheckedChanged event
/// - GroupName for mutual exclusion
/// - Value property for binding
/// - Content property for label text
/// </summary>
public class SkiaRadioButton : SkiaView
{
#region SKColor Helper
private static SKColor ToSKColor(Color? color)
{
if (color == null) return SKColors.Transparent;
return new SKColor(
(byte)(color.Red * 255),
(byte)(color.Green * 255),
(byte)(color.Blue * 255),
(byte)(color.Alpha * 255));
}
#endregion
#region BindableProperties
public static readonly BindableProperty IsCheckedProperty =
BindableProperty.Create(nameof(IsChecked), typeof(bool), typeof(SkiaRadioButton), false, BindingMode.OneWay,
BindableProperty.Create(
nameof(IsChecked),
typeof(bool),
typeof(SkiaRadioButton),
false,
BindingMode.TwoWay,
propertyChanged: (b, o, n) => ((SkiaRadioButton)b).OnIsCheckedChanged());
public static readonly BindableProperty ContentProperty =
BindableProperty.Create(nameof(Content), typeof(string), typeof(SkiaRadioButton), "", BindingMode.TwoWay,
BindableProperty.Create(
nameof(Content),
typeof(string),
typeof(SkiaRadioButton),
"",
BindingMode.TwoWay,
propertyChanged: (b, o, n) => ((SkiaRadioButton)b).InvalidateMeasure());
public static readonly BindableProperty ValueProperty =
BindableProperty.Create(nameof(Value), typeof(object), typeof(SkiaRadioButton), null, BindingMode.TwoWay);
BindableProperty.Create(
nameof(Value),
typeof(object),
typeof(SkiaRadioButton),
null,
BindingMode.TwoWay);
public static readonly BindableProperty GroupNameProperty =
BindableProperty.Create(nameof(GroupName), typeof(string), typeof(SkiaRadioButton), null, BindingMode.TwoWay,
BindableProperty.Create(
nameof(GroupName),
typeof(string),
typeof(SkiaRadioButton),
null,
BindingMode.TwoWay,
propertyChanged: (b, o, n) => ((SkiaRadioButton)b).OnGroupNameChanged((string?)o, (string?)n));
public static readonly BindableProperty RadioColorProperty =
BindableProperty.Create(nameof(RadioColor), typeof(SKColor), typeof(SkiaRadioButton), new SKColor(0x21, 0x96, 0xF3), BindingMode.TwoWay,
BindableProperty.Create(
nameof(RadioColor),
typeof(Color),
typeof(SkiaRadioButton),
Color.FromRgb(0x21, 0x96, 0xF3), // Material Blue
BindingMode.TwoWay,
propertyChanged: (b, o, n) => ((SkiaRadioButton)b).Invalidate());
public static readonly BindableProperty UncheckedColorProperty =
BindableProperty.Create(nameof(UncheckedColor), typeof(SKColor), typeof(SkiaRadioButton), new SKColor(0x75, 0x75, 0x75), BindingMode.TwoWay,
BindableProperty.Create(
nameof(UncheckedColor),
typeof(Color),
typeof(SkiaRadioButton),
Color.FromRgb(0x75, 0x75, 0x75),
BindingMode.TwoWay,
propertyChanged: (b, o, n) => ((SkiaRadioButton)b).Invalidate());
public static readonly BindableProperty TextColorProperty =
BindableProperty.Create(nameof(TextColor), typeof(SKColor), typeof(SkiaRadioButton), SKColors.Black, BindingMode.TwoWay,
BindableProperty.Create(
nameof(TextColor),
typeof(Color),
typeof(SkiaRadioButton),
Colors.Black,
BindingMode.TwoWay,
propertyChanged: (b, o, n) => ((SkiaRadioButton)b).Invalidate());
public static readonly BindableProperty DisabledColorProperty =
BindableProperty.Create(nameof(DisabledColor), typeof(SKColor), typeof(SkiaRadioButton), new SKColor(0xBD, 0xBD, 0xBD), BindingMode.TwoWay,
BindableProperty.Create(
nameof(DisabledColor),
typeof(Color),
typeof(SkiaRadioButton),
Color.FromRgb(0xBD, 0xBD, 0xBD),
BindingMode.TwoWay,
propertyChanged: (b, o, n) => ((SkiaRadioButton)b).Invalidate());
public static readonly BindableProperty FontSizeProperty =
BindableProperty.Create(nameof(FontSize), typeof(float), typeof(SkiaRadioButton), 14f, BindingMode.TwoWay,
BindableProperty.Create(
nameof(FontSize),
typeof(double),
typeof(SkiaRadioButton),
14.0,
BindingMode.TwoWay,
propertyChanged: (b, o, n) => ((SkiaRadioButton)b).InvalidateMeasure());
public static readonly BindableProperty RadioSizeProperty =
BindableProperty.Create(nameof(RadioSize), typeof(float), typeof(SkiaRadioButton), 20f, BindingMode.TwoWay,
BindableProperty.Create(
nameof(RadioSize),
typeof(double),
typeof(SkiaRadioButton),
20.0,
BindingMode.TwoWay,
propertyChanged: (b, o, n) => ((SkiaRadioButton)b).InvalidateMeasure());
public static readonly BindableProperty SpacingProperty =
BindableProperty.Create(nameof(Spacing), typeof(float), typeof(SkiaRadioButton), 8f, BindingMode.TwoWay,
BindableProperty.Create(
nameof(Spacing),
typeof(double),
typeof(SkiaRadioButton),
8.0,
BindingMode.TwoWay,
propertyChanged: (b, o, n) => ((SkiaRadioButton)b).InvalidateMeasure());
public static readonly BindableProperty BorderColorProperty =
BindableProperty.Create(
nameof(BorderColor),
typeof(Color),
typeof(SkiaRadioButton),
Color.FromRgb(0x75, 0x75, 0x75),
BindingMode.TwoWay,
propertyChanged: (b, o, n) => ((SkiaRadioButton)b).Invalidate());
public static readonly BindableProperty BorderWidthProperty =
BindableProperty.Create(
nameof(BorderWidth),
typeof(double),
typeof(SkiaRadioButton),
2.0,
BindingMode.TwoWay,
propertyChanged: (b, o, n) => ((SkiaRadioButton)b).Invalidate());
#endregion
#region Properties
/// <summary>
/// Gets or sets whether the radio button is checked.
/// </summary>
public bool IsChecked
{
get => (bool)GetValue(IsCheckedProperty);
set => SetValue(IsCheckedProperty, value);
}
/// <summary>
/// Gets or sets the text content displayed next to the radio button.
/// </summary>
public string Content
{
get => (string)GetValue(ContentProperty);
set => SetValue(ContentProperty, value);
}
/// <summary>
/// Gets or sets the value associated with this radio button.
/// </summary>
public object? Value
{
get => GetValue(ValueProperty);
set => SetValue(ValueProperty, value);
}
/// <summary>
/// Gets or sets the group name for mutual exclusion.
/// </summary>
public string? GroupName
{
get => (string?)GetValue(GroupNameProperty);
set => SetValue(GroupNameProperty, value);
}
public SKColor RadioColor
/// <summary>
/// Gets or sets the color of the radio circle when checked.
/// </summary>
public Color RadioColor
{
get => (SKColor)GetValue(RadioColorProperty);
get => (Color)GetValue(RadioColorProperty);
set => SetValue(RadioColorProperty, value);
}
public SKColor UncheckedColor
/// <summary>
/// Gets or sets the color of the radio circle when unchecked.
/// </summary>
public Color UncheckedColor
{
get => (SKColor)GetValue(UncheckedColorProperty);
get => (Color)GetValue(UncheckedColorProperty);
set => SetValue(UncheckedColorProperty, value);
}
public SKColor TextColor
/// <summary>
/// Gets or sets the text color.
/// </summary>
public Color TextColor
{
get => (SKColor)GetValue(TextColorProperty);
get => (Color)GetValue(TextColorProperty);
set => SetValue(TextColorProperty, value);
}
public SKColor DisabledColor
/// <summary>
/// Gets or sets the color used when disabled.
/// </summary>
public Color DisabledColor
{
get => (SKColor)GetValue(DisabledColorProperty);
get => (Color)GetValue(DisabledColorProperty);
set => SetValue(DisabledColorProperty, value);
}
public float FontSize
/// <summary>
/// Gets or sets the font size for the content text.
/// </summary>
public double FontSize
{
get => (float)GetValue(FontSizeProperty);
get => (double)GetValue(FontSizeProperty);
set => SetValue(FontSizeProperty, value);
}
public float RadioSize
/// <summary>
/// Gets or sets the size of the radio circle.
/// </summary>
public double RadioSize
{
get => (float)GetValue(RadioSizeProperty);
get => (double)GetValue(RadioSizeProperty);
set => SetValue(RadioSizeProperty, value);
}
public float Spacing
/// <summary>
/// Gets or sets the spacing between the radio circle and content.
/// </summary>
public double Spacing
{
get => (float)GetValue(SpacingProperty);
get => (double)GetValue(SpacingProperty);
set => SetValue(SpacingProperty, value);
}
/// <summary>
/// Gets or sets the border color.
/// </summary>
public Color BorderColor
{
get => (Color)GetValue(BorderColorProperty);
set => SetValue(BorderColorProperty, value);
}
/// <summary>
/// Gets or sets the border width.
/// </summary>
public double BorderWidth
{
get => (double)GetValue(BorderWidthProperty);
set => SetValue(BorderWidthProperty, value);
}
/// <summary>
/// Gets whether the control is currently hovered.
/// </summary>
public bool IsHovered { get; private set; }
#endregion
#region Group Management
private static readonly Dictionary<string, List<WeakReference<SkiaRadioButton>>> _groups = new();
public event EventHandler? CheckedChanged;
#endregion
#region Events
/// <summary>
/// Occurs when IsChecked changes.
/// </summary>
public event EventHandler<CheckedChangedEventArgs>? CheckedChanged;
#endregion
#region Constructor
public SkiaRadioButton()
{
IsFocusable = true;
}
#endregion
#region Event Handlers
private void OnIsCheckedChanged()
{
if (IsChecked && !string.IsNullOrEmpty(GroupName))
{
UncheckOthersInGroup();
}
CheckedChanged?.Invoke(this, EventArgs.Empty);
SkiaVisualStateManager.GoToState(this, IsChecked ? SkiaVisualStateManager.CommonStates.Checked : SkiaVisualStateManager.CommonStates.Unchecked);
CheckedChanged?.Invoke(this, new CheckedChangedEventArgs(IsChecked));
SkiaVisualStateManager.GoToState(this, IsChecked
? SkiaVisualStateManager.CommonStates.Checked
: SkiaVisualStateManager.CommonStates.Unchecked);
Invalidate();
}
@@ -153,6 +324,10 @@ public class SkiaRadioButton : SkiaView
AddToGroup(newValue);
}
#endregion
#region Group Management Methods
private void AddToGroup(string? groupName)
{
if (string.IsNullOrEmpty(groupName)) return;
@@ -163,6 +338,7 @@ public class SkiaRadioButton : SkiaView
_groups[groupName] = group;
}
// Clean up dead references
group.RemoveAll(wr => !wr.TryGetTarget(out _));
group.Add(new WeakReference<SkiaRadioButton>(this));
}
@@ -194,65 +370,120 @@ public class SkiaRadioButton : SkiaView
}
}
#endregion
#region Rendering
protected override void OnDraw(SKCanvas canvas, SKRect bounds)
{
var radioRadius = RadioSize / 2;
var radioSize = (float)RadioSize;
var fontSize = (float)FontSize;
var spacing = (float)Spacing;
var borderWidth = (float)BorderWidth;
var radioRadius = radioSize / 2;
var radioCenterX = bounds.Left + radioRadius;
var radioCenterY = bounds.MidY;
using var outerPaint = new SKPaint
{
Color = IsEnabled ? (IsChecked ? RadioColor : UncheckedColor) : DisabledColor,
Style = SKPaintStyle.Stroke,
StrokeWidth = 2,
IsAntialias = true
};
canvas.DrawCircle(radioCenterX, radioCenterY, radioRadius - 1, outerPaint);
if (IsChecked)
{
using var innerPaint = new SKPaint
{
Color = IsEnabled ? RadioColor : DisabledColor,
Style = SKPaintStyle.Fill,
IsAntialias = true
};
canvas.DrawCircle(radioCenterX, radioCenterY, radioRadius - 5, innerPaint);
}
// Get colors
var radioColorSK = ToSKColor(RadioColor);
var uncheckedColorSK = ToSKColor(UncheckedColor);
var textColorSK = ToSKColor(TextColor);
var disabledColorSK = ToSKColor(DisabledColor);
var borderColorSK = ToSKColor(BorderColor);
// Draw focus ring behind radio circle
if (IsFocused)
{
using var focusPaint = new SKPaint
{
Color = RadioColor.WithAlpha(80),
Color = radioColorSK.WithAlpha(80),
Style = SKPaintStyle.Fill,
IsAntialias = true
};
canvas.DrawCircle(radioCenterX, radioCenterY, radioRadius + 4, focusPaint);
}
// Draw outer circle (border)
using var outerPaint = new SKPaint
{
Color = IsEnabled
? (IsChecked ? radioColorSK : (IsHovered ? radioColorSK : uncheckedColorSK))
: disabledColorSK,
Style = SKPaintStyle.Stroke,
StrokeWidth = borderWidth,
IsAntialias = true
};
canvas.DrawCircle(radioCenterX, radioCenterY, radioRadius - 1, outerPaint);
// Draw inner filled circle when checked
if (IsChecked)
{
using var innerPaint = new SKPaint
{
Color = IsEnabled ? radioColorSK : disabledColorSK,
Style = SKPaintStyle.Fill,
IsAntialias = true
};
canvas.DrawCircle(radioCenterX, radioCenterY, radioRadius - 5, innerPaint);
}
// Draw content text
if (!string.IsNullOrEmpty(Content))
{
using var font = new SKFont(SKTypeface.Default, FontSize);
using var font = new SKFont(SKTypeface.Default, fontSize);
using var textPaint = new SKPaint(font)
{
Color = IsEnabled ? TextColor : DisabledColor,
Color = IsEnabled ? textColorSK : disabledColorSK,
IsAntialias = true
};
var textX = bounds.Left + RadioSize + Spacing;
var textX = bounds.Left + radioSize + spacing;
var textBounds = new SKRect();
textPaint.MeasureText(Content, ref textBounds);
canvas.DrawText(Content, textX, bounds.MidY - textBounds.MidY, textPaint);
}
}
#endregion
#region Pointer Events
public override void OnPointerEntered(PointerEventArgs e)
{
if (IsEnabled)
{
IsHovered = true;
SkiaVisualStateManager.GoToState(this, SkiaVisualStateManager.CommonStates.PointerOver);
Invalidate();
}
}
public override void OnPointerExited(PointerEventArgs e)
{
IsHovered = false;
SkiaVisualStateManager.GoToState(this, IsEnabled
? SkiaVisualStateManager.CommonStates.Normal
: SkiaVisualStateManager.CommonStates.Disabled);
Invalidate();
}
public override void OnPointerPressed(PointerEventArgs e)
{
if (!IsEnabled) return;
if (!IsChecked) IsChecked = true;
e.Handled = true;
}
public override void OnPointerReleased(PointerEventArgs e)
{
// No action needed
}
#endregion
#region Keyboard Events
public override void OnKeyDown(KeyEventArgs e)
{
if (!IsEnabled) return;
@@ -264,21 +495,37 @@ public class SkiaRadioButton : SkiaView
}
}
#endregion
#region Lifecycle
protected override void OnEnabledChanged()
{
base.OnEnabledChanged();
SkiaVisualStateManager.GoToState(this, IsEnabled ? SkiaVisualStateManager.CommonStates.Normal : SkiaVisualStateManager.CommonStates.Disabled);
SkiaVisualStateManager.GoToState(this, IsEnabled
? SkiaVisualStateManager.CommonStates.Normal
: SkiaVisualStateManager.CommonStates.Disabled);
}
#endregion
#region Layout
protected override SKSize MeasureOverride(SKSize availableSize)
{
var radioSize = (float)RadioSize;
var fontSize = (float)FontSize;
var spacing = (float)Spacing;
var textWidth = 0f;
if (!string.IsNullOrEmpty(Content))
{
using var font = new SKFont(SKTypeface.Default, FontSize);
using var font = new SKFont(SKTypeface.Default, fontSize);
using var paint = new SKPaint(font);
textWidth = paint.MeasureText(Content) + Spacing;
textWidth = paint.MeasureText(Content) + spacing;
}
return new SKSize(RadioSize + textWidth, Math.Max(RadioSize, FontSize * 1.5f));
return new SKSize(radioSize + textWidth, Math.Max(radioSize, fontSize * 1.5f));
}
#endregion
}