// Unity C# reference source

// Copyright (c) Unity Technologies. For terms of use, see

// https://unity3d.com/legal/licenses/Unity_Reference_Only_License

using System.Collections.Generic;

namespace UnityEngine.UIElements

{

public abstract class MouseManipulator : Manipulator

{

public List<ManipulatorActivationFilter> activators { get; private set; }

private ManipulatorActivationFilter m_currentActivator;

protected MouseManipulator()

{

activators = new List<ManipulatorActivationFilter>();

}

protected bool CanStartManipulation(IMouseEvent e)

{

foreach (var activator in activators)

{

if (activator.Matches(e))

{

m_currentActivator = activator;

return true;

}

}

return false;

}

protected bool CanStopManipulation(IMouseEvent e)

{

if (e == null)

{

return false;

}

return ((MouseButton)e.button == m_currentActivator.button);

}

}

}