mirror of https://github.com/ArduPilot/ardupilot
61 lines
1.8 KiB
C#
61 lines
1.8 KiB
C#
using System;
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namespace ArdupilotMega.Presenter
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{
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/// <summary>
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/// A command that executes delegates to determine whether the command can execute, and to execute the command.
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/// </summary>
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/// <remarks>
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/// <para>
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/// This command implementation is useful when the command simply needs to execute a method on a view model. The delegate for
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/// determining whether the command can execute is optional. If it is not provided, the command is considered always eligible
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/// to execute.
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/// </para>
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/// </remarks>
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public class DelegateCommand : ICommand
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{
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private readonly Predicate<object> _canExecute;
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private readonly Action<object> _execute;
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public DelegateCommand(Action<object> execute)
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{
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_execute = execute;
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}
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/// <summary>
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/// Constructs an instance of <c>DelegateCommand</c>.
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/// </summary>
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/// <param name="execute">
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/// The delegate to invoke when the command is executed.
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/// </param>
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/// <param name="canExecute">
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/// The delegate to invoke to determine whether the command can execute.
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/// </param>
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public DelegateCommand(Action<object> execute, Predicate<object> canExecute)
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{
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_execute = execute;
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_canExecute = canExecute;
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}
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/// <summary>
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/// Determines whether this command can execute.
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/// </summary>
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public bool CanExecute(object parameter)
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{
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if (_canExecute == null)
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{
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return true;
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}
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return _canExecute(parameter);
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}
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/// <summary>
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/// Executes this command.
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/// </summary>
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public void Execute(object parameter)
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{
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_execute(parameter);
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}
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}
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} |