Our app isn't playable yet:
Note
For code file for this section, refer to chapter 7\educ_memory_game\spirals\s05 in the code bundle.
All of this is coded in the mouseDown event handler, and we also need a variable lastCellClicked of type Cell in the Board class. Of course, this is exactly the cell which we get in the
mouseDown event handler. So, we set this 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.hidden...