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