LImageViewerCell::SetRequestedImage

#include "ltwrappr.h"

L_INT LImageViewerCell::SetRequestedImage(pBitmaps, pBitmapIndexes, nLength, uFlags)

Sends the requested images to the control; this function is used when the low memory usage feature is enabled (for more information see the LImageViewerCell::EnableCellLowMemoryUsage function).

Parameters

pBITMAPHANDLE pBitmaps

Array of a BITMAPHANDLE structure that contains the requested frames.

L_INT * pBitmapIndexes

Array of Integers containing the index of each bitmap in pBitmaps in respective manner.

L_INT nLength

Length of the pBitmapIndexes array.

L_UINT uFlags

Flag that indicate how to handle the images set.  Possible values are:

Value Meaning
CONTAINER_SETIMAGE_INSERT [0x00000000] Insert the requested image.  This is the default value.
CONTAINER_SETIMAGE_REPLACE [0x00000001] Replace the requested image with the corresponding index.

Returns

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

Comments

The low memory usage feature works by stopping the control from loading all the frames at runtime. Instead, the control will load only the frames that are currently visible on the cell. The control will send a request each time the user scrolls down or up, changes the number of visible framesetc. For example, suppose the cell layout is a 2X2 (See LImageViewerCell::SetCellProperties), and the user needs to load more than 100000 frames. The control will not load them all. This function will send a callback (LImageViewerCell::LowMemoryUsageCallBack) when the cell is loaded requesting 4 frames (1, 2, 3 and 4) (because the cell is 2X2). Once the user scrolls down the cell to show frame number 5, frame number 1 will be disposed of because it is no longer visible, and the callback will be fired to request frame number 5. When frames are requested, the user is supposed to send them to the control using the [LImageViewerCell:SetRequestedImage function.

For the callback, use the LImageViewerCell::LowMemoryUsageCallBack function, to use this callback, it must first be set by calling LImageViewerCell::EnableLowMemoryUsageCallBack function.

Required DLLs and Libraries

Help Version 20.0.2019.3.12
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