virtual L_BOOL LAnnVideo::IsFixedInRect(prc, uFlags)
Indicates whether there are any fixed annotations in the client rectangle prc.
Address of a RECT variable representing a client area of a window. This can be NULL. For more information, refer to the Comments section.
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:
|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 LAnnotation::IsSelected and LAnnotation::SetSelected 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.|
|TRUE||There is a fixed annotation object in the client area.|
|FALSE||There are no fixed annotation objects in the client area.|
This function is used primarily as an aid in scrolling annotations without using double buffering. For more information on double buffering, refer to:
A successful call to LAnnVideo::IsFixedInRect 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:
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
pLVideo -- Pointer to LAnnVideo annotation object.
L_INT LAnnVideo_IsFixedInRectExample(HWND hWnd, LAnnVideo *pLVideo)
bFixedInRect = pLVideo->IsFixedInRect(&rcClient, ANNFLAG_RECURSE);
pszMsg = bFixedInRect ? TEXT("There are fixed annotations visible") : TEXT("There are NO fixed annotations visible");
MessageBox(NULL, pszMsg, TEXT(""), MB_OK);
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