Draw Event

When an object is being drawn, the automation object will hook the object draw designer's AnnDrawDesigner.Draw to this event. Therefore, instead of hooking and unhooking to the various designers draw events, you can simply subscribe to this event once.

This example will show how to stop drawing new line objects.

Start with the AnnAutomationManager example, remove all the code inside the example function (search for the // TODO: add example code here comment) and insert the following code:

Click the example button then try to draw a line object.

JavaScript

example: function SiteLibrary_DefaultPage$example() {
   var _this = this;
   // Hook to the automation's Draw event
   this._automation.add_draw(function(sender, e) {
      // e is of type AnnDrawDesignerEventArgs

      // Check if we are drawing a line and we just started, if so, cancel it
      if(_this._automation.get_manager().get_currentObjectId() == Leadtools.Annotations.Core.AnnObject.lineObjectId &&
         e.get_operationStatus() == Leadtools.Annotations.Core.AnnDesignerOperationStatus.start) {
         alert("Canceling line...");
         e.set_cancel(true);
      }
   });
},

Parameter	Type	Description
sender	'var'	The source of the event.
e	AnnDrawDesignerEventArgs	The event data.

Reference

AnnAutomation Object
AnnAutomation Members