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// --------------------------------------------------------------------------------------------------------------------
// <copyright file="CancelScanCommand.cs" company="HandBrake Project (http://handbrake.fr)">
// This file is part of the HandBrake source code - It may be used under the terms of the GNU General Public License.
// </copyright>
// <summary>
// Command to cancel a scan that is in progress
// </summary>
// --------------------------------------------------------------------------------------------------------------------
namespace HandBrakeWPF.Commands
{
using System;
using System.Windows.Input;
using HandBrake.ApplicationServices.Services.Scan.EventArgs;
using HandBrake.ApplicationServices.Services.Scan.Interfaces;
/// <summary>
/// Command to cancel a scan that is in progress
/// </summary>
public class CancelScanCommand : ICommand
{
/// <summary>
/// The scan service wrapper.
/// </summary>
private readonly IScan scanServiceWrapper;
/// <summary>
/// Initializes a new instance of the <see cref="CancelScanCommand"/> class.
/// </summary>
/// <param name="ssw">
/// The scan service wrapper.
/// </param>
public CancelScanCommand(IScan ssw)
{
this.scanServiceWrapper = ssw;
this.scanServiceWrapper.ScanStared += this.ScanServiceWrapperScanStared;
this.scanServiceWrapper.ScanCompleted += this.ScanServiceWrapperScanCompleted;
}
/// <summary>
/// The scan service Scan Completed Event Handler.
/// Fires CanExecuteChanged
/// </summary>
/// <param name="sender">
/// The sender.
/// </param>
/// <param name="e">
/// The ScanCompletedEventArgs.
/// </param>
private void ScanServiceWrapperScanCompleted(object sender, ScanCompletedEventArgs e)
{
Caliburn.Micro.Execute.OnUIThread(this.OnCanExecuteChanged);
}
/// <summary>
/// The scan service scan started event handler.
/// Fires CanExecuteChanged
/// </summary>
/// <param name="sender">
/// The sender.
/// </param>
/// <param name="e">
/// The EventArgs.
/// </param>
private void ScanServiceWrapperScanStared(object sender, EventArgs e)
{
Caliburn.Micro.Execute.OnUIThread(this.OnCanExecuteChanged);
}
#region Implementation of ICommand
/// <summary>
/// Defines the method to be called when the command is invoked.
/// </summary>
/// <param name="parameter">Data used by the command. If the command does not require data to be passed, this object can be set to null.</param>
public void Execute(object parameter)
{
this.scanServiceWrapper.Stop();
}
/// <summary>
/// Defines the method that determines whether the command can execute in its current state.
/// </summary>
/// <returns>
/// true if this command can be executed; otherwise, false.
/// </returns>
/// <param name="parameter">Data used by the command. If the command does not require data to be passed, this object can be set to null.</param>
public bool CanExecute(object parameter)
{
if (this.scanServiceWrapper != null)
{
return this.scanServiceWrapper.IsScanning;
}
return false;
}
/// <summary>
/// The can execute changed.
/// </summary>
public event EventHandler CanExecuteChanged;
/// <summary>
/// The on can execute changed.
/// </summary>
protected virtual void OnCanExecuteChanged()
{
EventHandler handler = this.CanExecuteChanged;
if (handler != null)
{
handler(this, EventArgs.Empty);
}
}
#endregion
}
}
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