L_ILM_GETVIEWSIZE

Send this message to get the ImageList Control's view size.

Parameter

Description

wParam

Ignored. Use 0.

lParam

Ignored. Use 0.

Returns

>= 0

The number of rows/columns that are "visible".

< 0

An error occurred. Refer to Return Codes.

Comments

This message returns the size of the ImageList control's viewing area in rows or columns. The size includes partially visible rows/columns.

The value returned depends on the current scroll style . If the scroll style is SCROLLSTYLE_VERTICAL, then the value returned indicates rows. If the scroll style is SCROLLSTYLE_HORIZONTAL, then the value returned indicates columns.

The associated macro is

L_ImgListGetViewSize(hWnd)

For a complete list of available macros, refer to the Ltlst.h file.

See Also

Elements:

L_ILM_GETSCROLLSTYLE, L_ILM_SETSCROLLSTYLE, L_ILM_GETFIRSTVISIBLE

Topics:

Using the ImageList Control

 

Image List Control Messages

Example

L_INT ILM_GETVIEWSIZEExample(HWND hCtrl) 
{ 
   if(IsWindow(hCtrl)) 
   { 
      L_INT32 nSize; 
      L_INT32 nFirst; 
      L_INT32 nLast; 
      L_INT32 nCols; 
      L_INT32 nCount; 
      //NOTE: assume scroll style = SCROLLSTYLE_VERTICAL 
      //get the view size 
      nSize = (L_INT32)SendMessage(hCtrl, L_ILM_GETVIEWSIZE, 0, 0); 
      //get the first visible item 
      nFirst = (L_INT32)SendMessage(hCtrl, L_ILM_GETFIRSTVISIBLE, 0, 0); 
      //get the column count 
      nCols = (L_INT32)SendMessage(hCtrl, L_ILM_GETCOLCOUNT, 0, 0); 
      //calculate the index of last visible item 
      nLast = nFirst + (nSize*nCols) - 1;//0 based index 
      nCount = (L_INT32)SendMessage(hCtrl, L_ILM_GETITEMCOUNT, 0, 0); 
      if(nLast > nCount-1) 
         nLast = nCount-1; 
      return SUCCESS; 
   } 
   else 
      return ERROR_INVALID_PARAMETER; 
}

Help Version 19.0.2017.10.27
Products | Support | Contact Us | Copyright Notices
© 1991-2017 Apryse Sofware Corp. All Rights Reserved.
LEADTOOLS Raster Imaging C API Help
Introduction
Version History
Getting Started
LEADTOOLS Raster Imaging Features
Redistributables/Files To Be Included With Your Application
Quick Reference
Tutorials
Function References
Summary of Features
Appendix