L_AnnIsFixedInRect

#include "l_bitmap.h"

L_LTANN_API L_INT L_AnnIsFixedInRect(hObject, prc, pbFixedInRect, uFlags)

HANNOBJECT hObject;	handle to the annotation object
LPRECT prc;	address of variable representing client area
L_BOOL *pbFixedInRect;	address of variable to be updated
L_UINT uFlags;	flags that determine which objects to process

Indicates whether there are any fixed annotations in the client rectangle prc.

Parameter	Description
hObject	Handle to the annotation object.
prc	Address of a RECT variable representing a client area of a window. This can be NULL. For more information, see Comments below.
pbFixedInRect	Pointer to a variable to be updated with a value that indicates whether hObject is fixed and in the client area represented by prc. Possible values are:
	Value	Meaning
	TRUE	There is a fixed annotation object in the client area.
	FALSE	There are no fixed annotation objects in the client area.
uFlags	Flags that determine which objects to process. Most of the flags apply only to container objects. You can combine values when appropriate by using a bitwise OR ( \| ). The following are valid values:

	Value	Meaning
	0	Process only the specified object.
	ANNFLAG_SELECTED	[0x0001] Process only objects that have the selected property set to TRUE. For getting and setting the selected property, use the L_AnnGetSelected and L_AnnSetSelected functions.
	ANNFLAG_NOTTHIS	[0x0004] Process only one level of objects within the specified container, not the container itself. If there are containers within the container, they are modified, but the objects within them are not.
	ANNFLAG_RECURSE	[0x0008] Process objects within a container, and within any subcontainers, down to any level.
	ANNFLAG_NOTCONTAINER	[0x0002] (Used with ANNFLAG_RECURSE) Process objects within containers, not the containers themselves.
	ANNFLAG_NOINVALIDATE	[0x0010] Do not invalidate the affected rectangle in the window. Use this to avoid generating unwanted paint messages.
	ANNFLAG_CHECKMENU	[0x0020] Process objects only if the ANNAUTOTEXT_MENU_TEXT menu item has been selected.

Returns

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

Comments

This function is used primarily as an aid in scrolling annotations without using double buffering. For more information on double buffering, see the documentation for:

L_DoubleBufferEnable

L_DoubleBufferCreateHandle

L_DoubleBufferDestroyHandle

L_DoubleBufferBegin

L_DoubleBufferEnd

A successful call to L_AnnIsFixedInRect will update pbFixedInRect with TRUE if hObject intersects with prc and hObject is fixed. If prc is NULL, then pbFixedInRect is updated with TRUE if hObject is fixed.

It is useful to pass an annotation container object for parameter hObject, along with the uFlags equal to ANNFLAG_RECURSE. Then pbFixedInRect is updated with TRUE if ANY annotation object intersects with prc. If prc is NULL in this case, then pbFixedInRect is updated with TRUE if ANY fixed object exists in the container.

Fixed annotations are independent of the annotation container scalarX, scalarY, offsetX and offsetY properties. The result is that they do not scroll or move with the underlying image. For more information, refer to L_AnnSetScalarX, L_AnnSetScalarY, L_AnnSetOffsetX, and L_AnnSetOffsetY. For more information, refer to Fixed Annotations.

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.

Platforms

Win32, x64.

Example

This Example displays a message box telling if there are any fixed annotations visible in the client area of hWnd. This is useful for handling scrolling and zooming of fixed annotations without double-buffering. hWnd -- window displaying annotations hContainer -- handle to the annotation container

L_INT AnnIsFixedInRectExample(HWND hWnd,HANNOBJECT hContainer) 
{ 
   RECT     rcClient; 
   L_BOOL   bFixedInRect; 
   L_INT    nRet; 
   L_TCHAR* pszMsg; 
   GetClientRect(hWnd, &rcClient); 
   nRet = L_AnnIsFixedInRect(hContainer, &rcClient, &bFixedInRect, ANNFLAG_RECURSE); 
   if (nRet == SUCCESS) 
   { 
      pszMsg = bFixedInRect ? TEXT("There are fixed annotations visible") : TEXT("There are NO fixed annotations visible"); 
      MessageBox(NULL, pszMsg, TEXT(""), MB_OK); 
   } 
   else 
      return nRet; 
   return SUCCESS; 
}

Help Version 19.0.2017.10.27

LEADTOOLS Raster Imaging C API Help

Introduction

Version History

Getting Started

LEADTOOLS Raster Imaging Features

Redistributables/Files To Be Included With Your Application

Functions:	L_AnnGetFixed, L_AnnPopFixedState, L_AnnPushFixedState, L_AnnSetFixed, L_AnnGetTextFixedSize, L_AnnSetTextFixedSize, L_AnnGetLineFixedWidth, L_AnnSetLineFixedWidth
Topics:	Annotation Functions: Object Properties
	Annotation Objects - Default Values
	Annotation Objects - Automated Features
	Implementing an Automated Annotation Program
	Implementing a Non-automated Annotation Program
	Fixed Annotations
	Minimizing Flicker With Double Buffering
	Annotation Functions (Document/Medical only): Getting and Setting the Fixed Property