LAnimationWindow::IsPreviousFrameAvailable

#include "ltwrappr.h"

L_BOOL LAnimationWindow::IsPreviousFrameAvailable() const

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

Returns

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.

See Also

Functions:

LAnimationWindow::LAnimationWindow, LAnimationWindow::IsPlaying, LAnimationWindow::GetCurrentIndex, LAnimationWindow::IsPreviousFrameAvailable, LAnimationWindow::IsFirstFrame, LAnimationWindow::IsLastFrame, Class Members

Example

The following example behaves oppositely to PlayAnimation using IsPreviousFrameAvailable

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName 
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; 
}

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