LAnnButton::ChangeUserHandle

#include "ltwrappr.h"

virtual L_INT LAnnButton::ChangeUserHandle(nIndex, pAnnHandle)

L_INT32 nIndex;	/* index of the user handle to change */
pANNHANDLE pAnnHandle;	/* pointer to a structure that defines how to change the user handle */

Changes properties of an existing user-defined annotation handle.

Parameter	Description
nIndex	Index of the user handle to change. This index is zero-based.
pAnnHandle	Pointer to an ANNHANDLE structure that defines how to change the user handle.

Returns

SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

Use this function to change the properties of an existing user-defined annotation handle.

This function is used in conjunction with the LAnnButton::AddUserHandle and LAnnButton::EnumerateHandles functions.

Required DLLs and Libraries

LTANN

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

See Also

Functions:	Class Members
Topics	Annotation Functions: Object Properties
	Implementing Annotations
	Automated User Interface for Annotations
	Annotation Functions: Creating and Deleting Annotations
	Types of Annotations
	Annotation Functions: Implementing Custom Annotations
	Annotation Functions: Creating Custom Annotations
	Fixed Annotations
	Minimizing Flicker With Double Buffering
	Annotation Functions: Working with the Toolbar

Example

// This example changes the first user handle of an object by

// * Moving handle ten pixels to the left

// * Changing color of handle to blue

// * Changing shape of handle to square

// * Displays the hour glass cursor when mouse over the handle

L_INT LAnnButton_ChangeUserHandleExample(LAnnButton *LButton) 
{
   L_INT nRet;
   L_UINT uCount; 
   ANNHANDLE AnnHandle; 
   // Get the total count of user handles
   nRet = LButton->GetUserHandles(NULL, &uCount); 
   if(nRet != SUCCESS)
      return nRet;
   if (uCount > 0) 
   {
      memset(&AnnHandle, 0, sizeof(ANNHANDLE)); 
 
      AnnHandle.uStructSize = sizeof(&AnnHandle); 
 
      nRet = LButton->GetUserHandle(0, &AnnHandle); 
      if(nRet != SUCCESS)
         return nRet;
      AnnHandle.aptContainer.x +=10; 
      AnnHandle.crFill = RGB(0,0,255); 
 
      AnnHandle.nShape = ANNHANDLE_SHAPE_SQUARE; 
 
      AnnHandle.hCursor = LoadCursor(NULL,IDC_APPSTARTING); 
 
      AnnHandle.uFlags = ANNHANDLE_FILL_COLOR | ANNHANDLE_SHAPE | ANNHANDLE_LOCATION | ANNHANDLE_CONTAINER_COORDINATES; 
 
      nRet = LButton->ChangeUserHandle(0, &AnnHandle); 
      if(nRet != SUCCESS)
         return nRet;
   }
   else
   {
      MessageBox(NULL, TEXT("No User Handles!"), TEXT("Error"), MB_OK); 
      return FAILURE ;
   }
   return SUCCESS;
}