Adding and Removing Images
You can add bitmapped images, icons, or cursors to an image list. You add
bitmapped images by specifying the handles of two bitmaps in a call to the
ImageList_Add function. The first bitmap contains one or more images to add to the image
bitmap, and the second bitmap contains the masks to add to the mask bitmap. For
nonmasked image lists, the second bitmap handle is ignored; it can be set to
NULL.
The
ImageList_AddMasked function also adds bitmapped images to a masked image list. This function is
similar to
ImageList_Add, except that you do not specify a mask bitmap. Instead, you specify a color
that the system combines with the image bitmap to automatically generate the
masks. Each pixel of the specified color in the image bitmap is changed to black,
and the corresponding bit in the mask is set to one. As a result, any pixel in
the image that matches the specified color is transparent when the image is
drawn.
The
ImageList_AddIcon function adds an icon or cursor to an image list. If the image list is
masked,
ImageList_AddIcon adds the mask provided with the icon or cursor to the mask bitmap. If the
image list is nonmasked, the mask for the icon or cursor is not used when drawing
the image.
You can create an icon based on an image and mask in an image list by using
the
ImageList_GetIcon function. The function returns the handle of the new icon.
ImageList_Add,
ImageList_AddMasked, and
ImageList_AddIcon assign an index to each image as it is added to an image list. The indexes
are zero-based; that is, the first image in the list has an index of zero, the
next has an index of one, and so on. After adding a single image, the functions
return the index of the image. When more than one image is added at a time, the
functions return the index of the first image.
The
ImageList_Remove function removes an image from an image list.
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