func (il *ImageList) AddMasked(bitmap *Bitmap) (int32, error) {
if bitmap == nil {
return 0, newError("bitmap cannot be nil")
}
index := win.ImageList_AddMasked(
il.hIml,
bitmap.handle(),
win.COLORREF(il.maskColor))
if index == -1 {
return 0, newError("ImageList_AddMasked failed")
}
return index, nil
}
func imageIndexAddIfNotExists(image interface{}, hIml win.HIMAGELIST, imageUintptr2Index map[uintptr]int32) int32 {
imageIndex := int32(-1)
if image != nil {
var ptr uintptr
switch img := image.(type) {
case *Bitmap:
ptr = uintptr(unsafe.Pointer(img))
case *Icon:
ptr = uintptr(unsafe.Pointer(img))
}
if ptr == 0 {
return -1
}
if imageIndex, ok := imageUintptr2Index[ptr]; ok {
return imageIndex
}
switch img := image.(type) {
case *Bitmap:
imageIndex = win.ImageList_AddMasked(hIml, img.hBmp, 0)
case *Icon:
imageIndex = win.ImageList_ReplaceIcon(hIml, -1, img.hIcon)
}
if imageIndex > -1 {
imageUintptr2Index[ptr] = imageIndex
}
}
return imageIndex
}