source: stable/HeuristicLab.ExtLibs/HeuristicLab.Netron/3.0.2672.12446/Netron.Diagramming.Core-3.0.2672.12446/Diagram elements/Materials/ClickableLabelMaterial.cs

using System;
using System.Diagnostics;
using System.Windows.Forms;
namespace Netron.Diagramming.Core {
  /// <summary>
  /// Clickable label shape material, i.e. an hyperlink.
  /// </summary>
  public partial class ClickableLabelMaterial :
      LabelMaterial,
      IMouseListener,
      IHoverListener {

    // ------------------------------------------------------------------
    /// <summary>
    /// Occurs when the lable is clicked
    /// </summary>
    // ------------------------------------------------------------------
    public event EventHandler OnClick;

    #region Fields

    // ------------------------------------------------------------------
    /// <summary>
    /// the url of this link
    /// </summary>
    // ------------------------------------------------------------------
    private string mUrl = string.Empty;

    // ------------------------------------------------------------------
    /// <summary>
    /// Implementation of IVersion - the current version of 
    /// ClickableLabelMaterial.
    /// </summary>
    // ------------------------------------------------------------------
    protected double clickableLabelMaterialVersion = 1.0;

    #endregion

    #region Properties

    // ------------------------------------------------------------------
    /// <summary>
    /// Gets the current version.
    /// </summary>
    // ------------------------------------------------------------------
    public override double Version {
      get {
        return clickableLabelMaterialVersion;
      }
    }

    // ------------------------------------------------------------------
    /// <summary>
    /// Gets or sets the URL of this clickable material. Note that the 
    /// material can handle more than just Url's by overriding the mouse 
    /// event handlers.  Settings this property is just a convenient way 
    /// to accelerate the development or customization of shapes.
    /// </summary>
    /// <value>The URL.</value>
    // ------------------------------------------------------------------
    public string Url {
      get { return mUrl; }
      set { mUrl = value; }
    }

    #endregion

    #region Constructor
    /// <summary>
    /// Initializes a new instance of the <see cref="T:ClickableLabelMaterial"/> class.
    /// </summary>
    public ClickableLabelMaterial()
      : base() {
      //Resizable = false;
    }

    /// <summary>
    /// Initializes a new instance of the <see cref="T:ClickableLabelMaterial"/> class.
    /// </summary>
    /// <param name="text">The text.</param>
    public ClickableLabelMaterial(string text) : base(text) { }

    #endregion

    #region Methods

    private void RaiseOnClicked() {
      if (OnClick != null)
        OnClick(this, EventArgs.Empty);
    }

    #region IMouseListener Members
    /// <summary>
    /// Gets the service object of the specified type.
    /// </summary>
    /// <param name="serviceType">An object that specifies the type of service object to get.</param>
    /// <returns>
    /// A service object of type serviceType.-or- null if there is no service object of type serviceType.
    /// </returns>
    public override object GetService(Type serviceType) {
      if (serviceType.Equals(typeof(IMouseListener)))
        return this;
      else if (serviceType.Equals(typeof(IHoverListener)))
        return this;
      else
        return null;
    }

    /// <summary>
    /// Handles the mouse-down event
    /// </summary>
    /// <param name="e">The <see cref="T:MouseEventArgs"/> instance containing the event data.</param>
    public virtual bool MouseDown(MouseEventArgs e) {
      if (this.Rectangle.Contains(e.Location)) {
        if (mUrl.Length > 0)
          Process.Start(mUrl);
        RaiseOnClicked();
        return true;//let the rest of the loop go, the event was handled
      }
      return false;
    }

    /// <summary>
    /// Handles the mouse-move event
    /// </summary>
    /// <param name="e">The <see cref="T:MouseEventArgs"/> instance containing the event data.</param>
    public void MouseMove(MouseEventArgs e) {
      System.Diagnostics.Trace.WriteLine(e.Location.ToString());
    }

    /// <summary>
    /// Handles the mouse-up event
    /// </summary>
    /// <param name="e">The <see cref="T:MouseEventArgs"/> instance containing the event data.</param>
    public virtual void MouseUp(MouseEventArgs e) {

    }

    #endregion

    #region IHoverListener Members
    /// <summary>
    /// Handles the <see cref="OnMouseHover"/> event.
    /// </summary>
    /// <param name="e">The <see cref="T:System.Windows.Forms.MouseEventArgs"/> instance containing the event data.</param>
    public void MouseHover(MouseEventArgs e) {

    }
    private Cursor previousCursor;

    /// <summary>
    /// Handles the OnMouseEnter event.
    /// </summary>
    /// <param name="e">The <see cref="T:System.Windows.Forms.MouseEventArgs"/> instance containing the event data.</param>
    public void MouseEnter(MouseEventArgs e) {
      previousCursor = Cursor.Current;
      this.Shape.Model.RaiseOnCursorChange(Cursors.Hand);
    }

    /// <summary>
    /// Handles the OnMouseLeave event.
    /// </summary>
    /// <param name="e">The <see cref="T:System.Windows.Forms.MouseEventArgs"/> instance containing the event data.</param>
    public void MouseLeave(MouseEventArgs e) {
      this.Shape.Model.RaiseOnCursorChange(previousCursor);
    }

    //public override void Paint(Graphics g)
    //{
    //    g.DrawRectangle(Pens.Violet, Rectangle);
    //    base.Paint(g);
    //}
    #endregion
    #endregion
  }
}