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LAnimationWindow::IsPreviousFrameAvailable

Summary

Determines whether there is an existing frame prior to the current frame.

Syntax

#include "ltwrappr.h"

L_BOOL LAnimationWindow::IsPreviousFrameAvailable() const

Returns

Value	Meaning
TRUE	There is a frame prior to the current frame, so you can use LAnimationWindow::MovePreviousFrame.
FALSE	There is not a frame prior to the current frame, so you cannot use LAnimationWindow::MovePreviousFrame.

Comments

You cannot call this function during animation playback.

Required DLLs and Libraries

LTDIS
LTDLG
LTEFX
LTFIL
LTIMG
LTSCR
LTTWN
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

The following example behaves oppositely to PlayAnimation using IsPreviousFrameAvailable

L_INT LAnimationWindow_IsPreviousFrameAvailableExample(HWND hWndParent) 
 
{ 
   L_INT nRet; 
 
   LBase::LoadLibraries(LT_ALL_LEADLIB);  
 //make sure all libraries are loaded 
 
   LAnimationWindow MyAnimation; 
 
   MyAnimation.SetFileName(MAKE_IMAGE_PATH(TEXT("eye.gif"))); 
 
   nRet = MyAnimation.Load(); 
   if (nRet==SUCCESS) 
 
   { 
      nRet = MyAnimation.MoveLastFrame(); 
      if(nRet != SUCCESS) 
         return nRet; 
      MyAnimation.CreateWnd(hWndParent,0, WS_VISIBLE|WS_CHILD|WS_BORDER,0,0,300,300);  
       
      while (MyAnimation.IsPreviousFrameAvailable()) 
 
      { 
 
         Sleep(500); 
 
         MyAnimation.MovePreviousFrame(); 
 
      } 
 
   } 
   else 
      return nRet; 
 
 
   return SUCCESS; 
}