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AnnThumbStyle Class

Summary

Base class for all thumb styles.

Syntax
C#
VB
Java
Objective-C
C++
public abstract class AnnThumbStyle : IAnnThumbStyle 
Public MustInherit Class AnnThumbStyle  
   Implements IAnnThumbStyle  
@interface LTAnnThumbStyle : NSObject <LTIAnnThumbStyle, NSCopying> 
public abstract class AnnThumbStyle implements IAnnThumbStyle 
public: 
   ref class AnnThumbStyle abstract : IAnnThumbStyle 

Remarks

AnnThumbStyle is the default thumb style and renderer for the annotation objects in this platform. This is an abstract class that will implement most common operations, while actual rendering of the object is implemented in the derived class for the objects.

LEADTOOLS ships with the following thumb style implementations:

AnnObjectRenderer is the class responsible for rendering annotation objects, as well as rendering the objects themselves, the object renderer is responsible for rendering the thumbs used when the object is in a selected state.

The framework will call AnnObjectRenderer.RenderThumbs and AnnObjectRenderer.RenderRotatePointThumbs to render the selection and rotation thumbs at a specified location. These method will then call the AnnThumbStyle.Render of its LocationsThumbStyle, RotateCenterThumbStyle and RotateGripperThumbStyle objects to render the actual thumbs.

The annotations thumb style contains the following members:

Member Description
Size

The size of the thumb in container units.

Fill

The style to use for filling the thumb.

Stroke

The style to use for drawing the thumb.

Render

Called by the framework to render a thumb at a specified location.

HitTest

Called by the framework to check if a test point is on top of the thumb if rendered at a specified location.

When implementing a user-defined thumb style, one of the tasks required is to render the thumbs of an annotation object. You can derive your thumb style from this class and use its helper methods.

Requirements

Target Platforms

Help Version 20.0.2019.7.16
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Leadtools.Annotations.Rendering.WinForms Assembly