using System;
using System.Drawing;
using System.ComponentModel;

namespace DevComponents.Tree
{
	/// <summary>
	/// Represents node connector. Node connector is the line that is drawn to indicate connection between child and parent node.
	/// </summary>
	[ToolboxItem(false),System.ComponentModel.DesignTimeVisible(false),TypeConverter(typeof(System.ComponentModel.ExpandableObjectConverter))]
	public class NodeConnector:Component
	{
		#region Private Variables
		private int m_LineWidth=1;
		private Color m_LineColor=SystemColors.Highlight;
		private eNodeConnectorType m_ConnectorType=eNodeConnectorType.Curve;
		private bool m_UnderlineNoBorderNode=true;
		private eConnectorCap m_EndCap=eConnectorCap.Ellipse;
		//private eConnectorCap m_StartCap=eConnectorCap.None;
		private Size m_EndCapSize=new Size(5,5);
		//private Size m_StartCapSize=new Size(5,5);
		#endregion

		#region Events
		/// <summary>
		/// Occurs when appearance of the connector has changed as result of changed settings on the connector.
		/// </summary>
		public event EventHandler AppearanceChanged;
		#endregion

		#region Public Interface
		/// <summary>
		/// Default Constructor.
		/// </summary>
		public NodeConnector()
		{
		}

		/// <summary>
		/// Creates new instance of the object with specified parameters.
		/// </summary>
		/// <param name="lineWidth">Connector line width.</param>
		/// <param name="type">Connector type.</param>
		public NodeConnector(int lineWidth, eNodeConnectorType type)
		{
			this.LineWidth=lineWidth;
			this.ConnectorType=type;
		}

		/// <summary>
		/// Gets or sets the connector line width.
		/// </summary>
		[Browsable(true),DefaultValue(1),Category("Appearance"),Description("Indicates connector line width.")]
		public int LineWidth
		{
			get {return m_LineWidth;}
			set 
			{
				m_LineWidth=value;
				OnAppearanceChanged();
			}
		}

		/// <summary>
		/// Gets or sets the color of the connector line.
		/// </summary>
		[Browsable(true),Category("Appearance"),Description("Indicates color of the connector line.")]
		public Color LineColor
		{
			get {return m_LineColor;}
			set
			{
				m_LineColor=value;
				OnAppearanceChanged();
			}
		}

		/// <summary>
		/// Returns true if editor should serialize LineColor property.
		/// </summary>
		[Browsable(false),EditorBrowsable(EditorBrowsableState.Never)]
		public bool ShouldSerializeLineColor()
		{
			return m_LineColor!=SystemColors.Highlight;
		}

		/// <summary>
		/// Gets or sets the type of the connector.
		/// </summary>
		/// <remarks>
		/// See <see cref="eNodeConnectorType">eNodeConnectorType</see> enum for list of
		/// available connectors.
		/// </remarks>
		/// <seealso cref="eNodeConnectorType">eNodeConnectorType Enumeration</seealso>
		[Browsable(true),DefaultValue(eNodeConnectorType.Curve),Category("Appearance"),Description("Indicates visual type of the connector.")]
		public eNodeConnectorType ConnectorType
		{
			get {return m_ConnectorType;}
			set 
			{
				m_ConnectorType=value;
				OnAppearanceChanged();
			}
		}

		/// <summary>
		/// Gets or sets whether the child node without borders is underlined as a
		/// continuation of the connector from node's parent. Default value is true.
		/// </summary>
		/// <remarks>
		/// To enhance visual appearance of the connectors that are connecting to the node
		/// with no borders assigned the connector is continued as a single line under the node
		/// when this property is set to true (default) value.
		/// </remarks>
		[Browsable(true),DefaultValue(true),Category("Behavior"),Description("Indicates whether connector is drawn under the nodes with no borders assigned.")]
		public bool UnderlineNoBorderNode
		{
			get {return m_UnderlineNoBorderNode;}
			set
			{
				m_UnderlineNoBorderNode=value;
				OnAppearanceChanged();
			}
		}

		/// <summary>
		/// Gets or sets the type of the cap that connector is ended with. Note that connector starts with parent node and ends with the child node. Default value is Ellipse.
		/// </summary>
		[Browsable(true),DefaultValue(eConnectorCap.Ellipse),Category("Appearance"),Description("Indicates type of the cap that connector is ended with.")]
		public eConnectorCap EndCap
		{
			get {return m_EndCap;}
			set
			{
				m_EndCap=value;
				OnAppearanceChanged();
			}
		}

		/// <summary>
		/// Gets or sets the size of the end cap.
		/// </summary>
		[Browsable(true),Category("Appearance"),Description("Indicates the size of the end cap.")]
		public System.Drawing.Size EndCapSize
		{
			get {return m_EndCapSize;}
			set
			{
				m_EndCapSize=value;
				OnAppearanceChanged();
			}
		}

		/// <summary>
		/// Returns true if EndCapSize property should be serialized by editor.
		/// </summary>
		/// <returns></returns>
		[Browsable(false),EditorBrowsable(EditorBrowsableState.Never)]
		public bool ShouldSerializeEndCapSize()
		{
			return (m_EndCapSize.Width!=5 || m_EndCapSize.Height!=5);
		}
		#endregion

		#region Private Implementation
		private void OnAppearanceChanged()
		{
			if(AppearanceChanged!=null)
				AppearanceChanged(this,new EventArgs());
		}
		#endregion

//		/// <summary>
//		/// Gets or sets the type of the cap that connector is started with. Note that connector starts with parent node and ends with the child node.  Default value is None.
//		/// </summary>
//		[Browsable(true),DefaultValue(eConnectorCap.None),Category("Appearance"),Description("Indicates type of the cap that connector is starts with.")]
//		public eConnectorCap StartCap
//		{
//			get {return m_StartCap;}
//			set {m_StartCap=value;}
//		}
//
//		/// <summary>
//		/// Gets or sets the size of the start cap.
//		/// </summary>
//		[Browsable(true),Category("Appearance"),Description("Indicates the size of the start cap.")]
//		public System.Drawing.Size StartCapSize
//		{
//			get {return m_StartCapSize;}
//			set {m_StartCapSize=value;}
//		}
//
//		/// <summary>
//		/// Returns true if StartCapSize property should be serialized by editor.
//		/// </summary>
//		/// <returns></returns>
//		[Browsable(false),EditorBrowsable(EditorBrowsableState.Never)]
//		public bool ShouldSerializeStartCapSize()
//		{
//			return (m_StartCapSize.Width!=5 || m_StartCapSize.Height!=5);
//		}
	}
}