Invalidate Method (AnnObject)

Invalidates the whole area of this object and signals the container to redraw the control.

Syntax

C#
Visual Basic
Objective-C
Java
C++

public virtual void Invalidate()

'Declaration
 
Public Overridable Sub Invalidate()

'Usage
 
Dim instance As AnnObject
 
instance.Invalidate()

public:
virtual void Invalidate();

Example

This example will check if any of the objects in a container is a line, if so, it will change the color to red and signal the container to redraw the object.

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

Copy Code

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

Private Sub InvalidateExample(ByVal container As AnnContainer)
   For Each obj As AnnObject In container.Children
      If TypeOf (obj) Is AnnLineObject Then
         obj.Stroke = Colors.Red
         obj.Invalidate()
      End If
   Next
End Sub

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

private void InvalidateExample(AnnContainer container)
{
   foreach(AnnObject obj in container.Children)
   {
      if(obj is AnnLineObject)
      {
         obj.Stroke = Colors.Red;
         obj.Invalidate();
      }
   }
}

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

private void InvalidateExample(AnnContainer container)
{
   foreach(AnnObject obj in container.Children)
   {
      if(obj is AnnLineObject)
      {
         obj.Stroke = Colors.Red;
         obj.Invalidate();
      }
   }
}

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

Private Sub InvalidateExample(ByVal container As AnnContainer)
   For Each obj As AnnObject In container.Children
      If TypeOf obj Is AnnLineObject Then
         obj.Stroke = Colors.Red
         obj.Invalidate()
      End If
   Next obj
End Sub

Requirements

Target Platforms

Reference

AnnObject Class
AnnObject Members