BeforeObjectChanged Event

C#
Visual Basic
Objective-C
Java
C++

public event EventHandler<AnnBeforeObjectChangedEventArgs> BeforeObjectChanged

'Declaration
 
Public Event BeforeObjectChanged As EventHandler(Of AnnBeforeObjectChangedEventArgs)

'Usage
 
Dim instance As AnnAutomation
Dim handler As EventHandler(Of AnnBeforeObjectChangedEventArgs)
 
AddHandler instance.BeforeObjectChanged, handler

public:
event EventHandler<AnnBeforeObjectChangedEventArgs^>^ BeforeObjectChanged

The event handler receives an argument of type AnnBeforeObjectChangedEventArgs containing data related to this event. The following AnnBeforeObjectChangedEventArgs properties provide information specific to this event.

Property	Description
Cancel	Gets or sets a value indicating whether the change should be canceled.
ChangeType	Gets the type of change.
Designer	Gets the designer responsible for the change.
Objects	Gets the objects that have been changed.

This event will be fired before an AnnObject is about to be modified by this AnnAutomation.

This example will prevent changing the stroke of all annotation objects.

C#
Visual Basic
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools.Windows.Controls
Imports Leadtools.Windows.Annotations

Private Sub AnnAutomation_BeforeObjectChanged(ByVal manager As AnnAutomationManager)
   ' subscribe to the BeforeObjectChanged of all automations
   For Each automation As AnnAutomation In manager.Automations
      AddHandler automation.BeforeObjectChanged, AddressOf automation_BeforeObjectChanged
   Next automation
End Sub
Private Sub automation_BeforeObjectChanged(ByVal sender As Object, ByVal e As AnnBeforeObjectChangedEventArgs)
   ' prevent changing the stroke
   If e.ChangeType = AnnObjectChangedType.Stroke Then
      e.Cancel = True
   End If
End Sub

using Leadtools.Windows.Controls;
using Leadtools.Windows.Annotations;
using Leadtools.Demos;
using Leadtools.Help;

private void AnnAutomation_BeforeObjectChanged(AnnAutomationManager manager)
{
   // subscribe to the BeforeObjectChanged of all automations
   foreach(AnnAutomation automation in manager.Automations)
      automation.BeforeObjectChanged += new EventHandler<AnnBeforeObjectChangedEventArgs>(automation_BeforeObjectChanged);
}
private void automation_BeforeObjectChanged(object sender, AnnBeforeObjectChangedEventArgs e)
{
   // prevent changing the stroke
   if(e.ChangeType == AnnObjectChangedType.Stroke)
      e.Cancel = true;
}

using Leadtools.Windows.Controls;
using Leadtools.Windows.Annotations;
using Leadtools.Examples;
using Leadtools.Silverlight.Demos;

private void AnnAutomation_BeforeObjectChanged(AnnAutomationManager manager)
{
   // subscribe to the BeforeObjectChanged of all automations
   foreach(AnnAutomation automation in manager.Automations)
      automation.BeforeObjectChanged += new EventHandler<AnnBeforeObjectChangedEventArgs>(automation_BeforeObjectChanged);
}
private void automation_BeforeObjectChanged(object sender, AnnBeforeObjectChangedEventArgs e)
{
   // prevent changing the stroke
   if(e.ChangeType == AnnObjectChangedType.Stroke)
      e.Cancel = true;
}

Imports Leadtools.Windows.Controls
Imports Leadtools.Windows.Annotations
Imports Leadtools.Silverlight.Demos

Private Sub AnnAutomation_BeforeObjectChanged(ByVal manager As AnnAutomationManager)
   ' subscribe to the BeforeObjectChanged of all automations
   For Each automation As AnnAutomation In manager.Automations
      AddHandler automation.BeforeObjectChanged, AddressOf automation_BeforeObjectChanged
   Next automation
End Sub
Private Sub automation_BeforeObjectChanged(ByVal sender As Object, ByVal e As AnnBeforeObjectChangedEventArgs)
   ' prevent changing the stroke
   If e.ChangeType = AnnObjectChangedType.Stroke Then
      e.Cancel = True
   End If
End Sub

Target Platforms

Reference

AnnAutomation Class
AnnAutomation Members