Connected.Components/Components/Button/ButtonBase.cs

using System.Windows.Input;
using Connected.Annotations;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Web;
using static System.String;

namespace Connected.Components;

public abstract class ButtonBase : UIComponent
{
	/// <summary>
	/// Potential activation target for this button. This enables RenderFragments with user-defined
	/// buttons which will automatically activate the intended functionality. 
	/// </summary>
	[CascadingParameter] protected IActivatable Activateable { get; set; }

	/// <summary>
	/// The HTML element that will be rendered in the root by the component
	/// By default, is a button
	/// </summary>
	[Parameter]
	[Category(CategoryTypes.Button.ClickAction)]
	public string HtmlTag { get; set; } = "button";

	/// <summary>
	/// The button Type (Button, Submit, Refresh)
	/// </summary>
	[Parameter]
	[Category(CategoryTypes.Button.ClickAction)]
	public ButtonType ButtonType { get; set; }

	/// <summary>
	/// If set to a URL, clicking the button will open the referenced document. Use Target to specify where
	/// </summary>
	[Parameter]
	[Category(CategoryTypes.Button.ClickAction)]
	public string Href { get; set; }
	/// <summary>
	/// If set to a URL, clicking the button will open the referenced document. Use Target to specify where (Obsolete replaced by Href)
	/// </summary>

	[Obsolete("Use Href Instead.", false)]
	[Parameter]
	[Category(CategoryTypes.Button.ClickAction)]
	public string Link
	{
		get => Href;
		set => Href = value;
	}

	/// <summary>
	/// The target attribute specifies where to open the link, if Link is specified. Possible values: _blank | _self | _parent | _top | <i>framename</i>
	/// </summary>
	[Parameter]
	[Category(CategoryTypes.Button.ClickAction)]
	public string Target { get; set; }

	/// <summary>
	/// If true, the button will be disabled.
	/// </summary>
	[Parameter]
	[Category(CategoryTypes.Button.Behavior)]
	public bool Disabled { get; set; }

	/// <summary>
	/// If true, no drop-shadow will be used.
	/// </summary>
	[Parameter]
	[Category(CategoryTypes.Button.Appearance)]
	public bool DisableElevation { get; set; }

	/// <summary>
	/// If true, disables ripple effect.
	/// </summary>
	[Parameter]
	[Category(CategoryTypes.Button.Appearance)]
	public bool DisableRipple { get; set; }

	/// <summary>
	/// Command executed when the user clicks on an element.
	/// </summary>
	[Parameter]
	[Category(CategoryTypes.Button.ClickAction)]
	public ICommand Command { get; set; }

	/// <summary>
	/// Command parameter.
	/// </summary>
	[Parameter]
	[Category(CategoryTypes.Button.ClickAction)]
	public object CommandParameter { get; set; }

	/// <summary>
	/// Button click event.
	/// </summary>
	[Parameter]
	public EventCallback<MouseEventArgs> OnClick { get; set; }

	protected async Task OnClickHandler(MouseEventArgs ev)
	{
		if (Disabled)
			return;
		await OnClick.InvokeAsync(ev);
		if (Command?.CanExecute(CommandParameter) ?? false)
		{
			Command.Execute(CommandParameter);
		}
		Activateable?.Activate(this, ev);
	}

	protected override void OnInitialized()
	{
		SetDefaultValues();
	}

	protected override void OnParametersSet()
	{
		//if params change, must set default values again
		SetDefaultValues();
	}

	//Set the default value for HtmlTag, Link and Target 
	private void SetDefaultValues()
	{
		if (Disabled)
		{
			HtmlTag = "button";
			Href = null;
			Target = null;
			return;
		}

		// Render an anchor element if Link property is set and is not disabled
		if (!IsNullOrWhiteSpace(Href))
		{
			HtmlTag = "a";
		}
	}

	protected ElementReference _elementReference;

	public ValueTask FocusAsync() => _elementReference.FocusAsync();
}