ColorPicker

A full-featured color picker with spectrum view, hue bar, opacity slider, hex input, and preview swatch. Available as both an inline ColorPicker control and a ColorPickerButton that opens the picker as a popup dialog.

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Frameworks

.NET MAUI

Blazor

Screenshots

Button	Picker Dialog

Basic Usage

ColorPickerButton (popup dialog)

<shiny:ColorPickerButton SelectedColor="{Binding SelectedColor}"
                         Text="Pick Color"
                         ShowOpacity="True" />

ColorPicker (inline)

<shiny:ColorPicker SelectedColor="{Binding SelectedColor}"
                   ShowOpacity="True" />

ColorPickerButton Properties

Property	Type	Default	Description
SelectedColor	Color	Red	Currently selected color (TwoWay)
Text	string?	null	Button label text
ShowOpacity	bool	false	Show/hide opacity slider in the picker
CornerRadius	int	8	Button corner radius
ColorChangedCommand	ICommand?	null	Fires when color changes

Event: ColorChanged (EventHandler<Color>)

ColorPicker Properties

Property	Type	Default	Description
SelectedColor	Color	Red	Currently selected color (TwoWay)
ShowOpacity	bool	true	Show/hide opacity slider
ShowHexInput	bool	true	Show/hide hex input field
ShowPreview	bool	true	Show/hide color preview swatch
ColorChangedCommand	ICommand?	null	Fires when color changes

Event: ColorChanged (EventHandler<Color>)

Features

• Color spectrum – HSV-based spectrum with saturation (horizontal) and brightness (vertical) axes
• Hue bar – Full rainbow hue slider below the spectrum
• Opacity slider – Optional alpha channel slider with gradient track
• Preview swatch – Live preview of the selected color
• Hex input – Enter colors as hex values (#RGB, #RRGGBB, or #AARRGGBB)
• Auto-contrast – Button text color automatically adjusts for readability against the selected color
• Popup mode – ColorPickerButton opens the picker as an overlay dialog with a backdrop and Done button

ViewModel Pattern

public partial class ColorPickerViewModel : ObservableObject
{
    [ObservableProperty] Color selectedColor = Colors.CornflowerBlue;
    [ObservableProperty] bool showOpacity = true;
    [ObservableProperty] string colorDisplay = "#6495ED";

    partial void OnSelectedColorChanged(Color value)
    {
        var r = (int)(value.Red * 255);
        var g = (int)(value.Green * 255);
        var b = (int)(value.Blue * 255);
        ColorDisplay = $"#{r:X2}{g:X2}{b:X2}";
    }
}

Blazor Usage

The Blazor components mirror the MAUI controls. Colors use CSS strings:

@using Shiny.Blazor.Controls

<!-- Inline picker -->
<ColorPicker SelectedColor="@selectedColor"
             SelectedColorChanged="c => selectedColor = c"
             ShowOpacity="true" />

<!-- Popup button -->
<ColorPickerButton SelectedColor="@selectedColor"
                   SelectedColorChanged="c => selectedColor = c"
                   Text="Pick Color"
                   ShowOpacity="true" />

@code {
    string selectedColor = "#6495ED";
}

Note

On Blazor, SelectedColor is a CSS color string (e.g. "#FF0000", "red") instead of a Color object. ColorChangedCommand becomes SelectedColorChanged (EventCallback<string>).

AI Skill

Claude CodeGitHub Copilot

Step 1 — Add the marketplace:

claude plugin marketplace add shinyorg/skills

Step 2 — Install the plugin:

claude plugin install controls@shiny

Step 1 — Add the marketplace:

copilot plugin marketplace add https://github.com/shinyorg/skills

Step 2 — Install the plugin:

copilot plugin install controls@shiny

View controls Plugin