func startWhiteKeysLayer(glctx gl.Context) *whiteKeysLayer {
layer := whiteKeysLayer{}
// Create white keys
layer.keys = make([]models.Key, 0, 0)
for idx := util.FirstKey; idx <= util.LastKey; idx++ {
if !util.IsBlackKey(idx) {
layer.keys = append(layer.keys,
models.NewWhiteKey(glctx, idx, util.InitSizeEvent, len(layer.keys)))
}
}
return &layer
}
func startBlackKeysLayer(glctx gl.Context, whiteKeys []models.Key) *blackKeysLayer {
layer := blackKeysLayer{}
// Create black keys
layer.keys = make([]models.Key, 0, 0)
for idx := util.FirstKey; idx <= util.LastKey; idx++ {
if util.IsBlackKey(idx) {
whiteKeyIdx := int((idx - util.FirstKey)) - (1 + len(layer.keys))
layer.keys = append(layer.keys, models.NewBlackKey(whiteKeys[whiteKeyIdx],
glctx,
idx,
util.InitSizeEvent))
}
}
return &layer
}