Our app isn't playable yet:
Note
For the code file for this section, refer to Chapter 7\code\educ_memory_game\spirals\s05 in the code bundle.
All of this is coded in the mouseDown event handler and we also need a lastCellClicked variable of the Cell type in the Board class. Of course, this is exactly the cell we get in the mouseDown event handler. So, we will set it in line (5) in the following code snippet:
void onMouseDown(MouseEvent e) {
// same code as in Spiral 4 -
if (cell.twin == lastCellClicked && lastCellClicked.shown) { (1)
lastCellClicked.hidden = false; (2)
if (memory.recalled) memory.hide(); (3)
} else {
new Timer(const Duration(milliseconds: 1000), () => cell...