using System;

using System.Collections.Generic;

namespace Assistance {

	public class Tool {

		[Flags]

		public enum ModifierTypes {

			None = 0,

			Tangents = 1,

			Interpolation = 2,

			Guideline = 4,

			Multiline = 8,

			All = 15

		};

		public readonly Workarea workarea;

		public Tool(Workarea workarea)

			{ this.workarea = workarea; }

		public virtual ModifierTypes getAvailableModifierTypes()

			{ return ModifierTypes.None; }

		public virtual void activate() { }

		public virtual void keyEvent(bool press, Gdk.Key key, InputState state) { }

		public virtual void buttonEvent(bool press, Gdk.Device device, uint button, InputState state) { }

		// create new painting level and return true, or do nothing and return false

		// was:            ------O-------O------ 

		// become:         ------O-------O------O

		public virtual bool paintPush() { return false; }

		// paint several track-points at the top painting level

		// was:            ------O-------O------

		// become:         ------O-------O------------

		public virtual void paintTracks(List<Track> tracks) { }

		// try to merge N top painting levels and return count of levels that actually merged

		// was:            ------O-------O------O------

		// become (N = 2): ------O---------------------

		public virtual int paintApply(int count) { return 0; }

		// reset top level to initial state

		// was:            ------O-------O------O------

		// become:         ------O-------O------O

		public virtual void paintCancel() { }

		// cancel and pop N painting levels

		// was:            ------O-------O------O------

		// become (N = 2): ------O-------

		public virtual void paintPop(int count) { }

		public virtual void draw(Cairo.Context context) { }

		public virtual void deactivate() { }

	}

}