Creating a custom annotation tool in Xamarin.Android

Creating a new tool in Xamarin.Android is similar to creating a new tool in Android. See tutorial in Android guides .

For example, the equivalent of the example provided in the Android guide will be:

1. Creating CustomTool:

   using System;
   
   using pdftron.PDF;
   using pdftron.PDF.Tools;
   using pdftron.PDF.Tools.Utils;
   
   using Polygon = pdftronprivate.PDF.Annots.Polygon;
   
   namespace PDFNetAndroidXamarinSample
   {
       public class CustomTool : RectCreate
       {
           public static ToolManager.IToolModeBase MODE = ToolManager.ToolMode.AddNewMode((int)Annot.Type.e_Polygon);
   
           public CustomTool(PDFViewCtrl ctrl) : base(ctrl)
           {
   
           }
   
           public override ToolManager.IToolModeBase ToolMode
           {
               get
               {
                   return MODE;
               }
           }
   
           protected override pdftronprivate.PDF.Annot CreateMarkup(pdftronprivate.PDF.PDFDoc doc, pdftronprivate.PDF.Rect bbox)
           {
               var poly = new Polygon(Polygon.Create(doc, (int)Annot.Type.e_Polygon, bbox));
               var color = Utils.Color2ColorPt(Android.Graphics.Color.Red);
               poly.SetColor(color, 3);
               poly.SetVertex(0, new pdftronprivate.PDF.Point(bbox.X1, bbox.Y1));
               poly.SetVertex(1, new pdftronprivate.PDF.Point(bbox.X1, bbox.Y2));
               poly.SetVertex(2, new pdftronprivate.PDF.Point(bbox.X2, bbox.Y2));
               poly.SetVertex(3, new pdftronprivate.PDF.Point(bbox.X2, bbox.Y1));
               poly.IntentName = pdftronprivate.PDF.Annots.PolyLine.EPolygonCloud;
               poly.BorderEffect = pdftronprivate.PDF.Annots.Markup.ECloudy;
               poly.BorderEffectIntensity = 2.0;
               poly.Rect = bbox;
   
               return poly;
           }
       }
   }

2. Using the tool:

mToolManager.Tool = new CustomTool(mPdfViewCtrl);