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L_UpdateZoomView

Summary

Updates the specified Zoom View with new settings.

Syntax

#include "l_bitmap.h"

L_LTZMV_API L_INT L_UpdateZoomView(hWnd, pZoomViewProps)

Parameters

HWND hWnd

Handle to a window.

pZOOMVIEWPROPS pZoomViewProps

Pointer to a ZOOMVIEWPROPS structure to be updated with options for controlling the behavior of the zoomed view. You must fill pZoomViewProps->uIndex before calling this function.

Returns

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

Comments

This function should be called any time the image's destination rectangle has been updated in an application. For example, if the image is scrolled or zoomed, call this function with the new destination rectangle.

You should also call this function if you process or change the image in any way (for example, L_FlipBitmap).

To change the current options for a Zoom View, change the values in the structure pointed to by pZoomViewProps and pass a pointer to the updated structure to the L_UpdateZoomView function.

To attach a zoomed view to a window, call the L_CreateZoomView function. To display a zoomed view, call the L_RenderZoomView function.

When a Zoom View is no longer needed, call the L_DestroyZoomView function to stop the specified Zoom View procedure and to detach it from the window handle.

Required DLLs and Libraries

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

Platforms

Win32, x64.

Example

L_INT UpdateZoomViewExample(HWND hWnd) 
{ 
   L_INT nRet; 
   L_UINT uCount, i; 
   ZOOMVIEWPROPS ZoomViewProps; 
   memset(&ZoomViewProps, 0, sizeof(ZOOMVIEWPROPS)); 
 
   if (!L_WindowHasZoomView(hWnd)) 
      return FALSE; 
 
   nRet = L_GetZoomViewsCount(hWnd, &uCount); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   for (i = 0; i < uCount; ++i) 
   { 
      ZoomViewProps.uIndex = i; 
      nRet = L_GetZoomViewProps(hWnd, &ZoomViewProps, sizeof(ZoomViewProps)); 
      if (nRet != SUCCESS) 
         return nRet; 
 
      ZoomViewProps.bCallouts = FALSE; 
      nRet = L_UpdateZoomView(hWnd, &ZoomViewProps); 
      if (nRet != SUCCESS) 
         return nRet; 
   } 
 
   return SUCCESS; 
}