public MainPage()
{
InitializeComponent();
_gameHistory = LocalStorage.Load(); // read from local storage and populate the observable collection.
ListView.ItemsSource = _gameHistory;
_gridSize = 4;
DisplayScores();
}
// this method gets called when a user taps a rectangle
private void Rectangle_Tapped(object sender, TappedRoutedEventArgs e)
{
// get the rectangle that was clicked
var rect = (Rectangle)sender;
// on first click, the tile flips
if (_clickNo == 0)
{
RevealImage(rect);
_firstRectangle = rect;
_clickNo = 1;
}
else if (_clickNo == 1)
{ // on second click, tile flips
// ignore clicks on the same image
if (_firstRectangle == rect)
{
return;
}
RevealImage(rect);
_secondRectangle = rect;
_clickNo = 2;
bool gameOver = _totalTilesLeft == 2;
if (gameOver)
{
_currentScore += 10; // each match is worth 10 points
if (_currentScore > LocalStorage.LoadHighScore())
{
LocalStorage.SaveHighScore(_currentScore);
}
DisplayScores();
// adding a game to the game history observable collection will make it appear in the game history page.
_gameHistory.Add(new Game(LocalStorage.Load().Count + 1, _currentScore, _gridSize, DateTime.Now));
// save all the games to local storage.
LocalStorage.Save(_gameHistory);
//display Game over message
TxtGameOver.Visibility = Visibility.Visible;
return;
}
}
else if (_clickNo == 2)
{
// ton 3rd click, check the previous 2 rectangles to see if they match
if (rect == _firstRectangle || rect == _secondRectangle)
{ // ignore clicks on the same two rectangles.
return;
}
// use tag to determine if 2 rectangles are a pair
bool rectanglesMatch = _firstRectangle.Tag.ToString() == _secondRectangle.Tag.ToString();
if (rectanglesMatch)
{
// remove the event handler so it can't be clicked again
_firstRectangle.Tapped -= Rectangle_Tapped;
_secondRectangle.Tapped -= Rectangle_Tapped;
_totalTilesLeft -= 2; // we have 2 fewer tiles.
_currentScore += 10; // user gets 10 points when getting a match
if (_currentScore > LocalStorage.LoadHighScore())
{
LocalStorage.SaveHighScore(_currentScore);
}
}
else
{
// reset the 2 images that didn't match
SetToDefault(_firstRectangle);
SetToDefault(_secondRectangle);
_currentScore -= 1; // user loses 5 if the make a mistake.
// the minimum score is 0, prevent negative scores.
if (_currentScore < 0)
{
_currentScore = 0;
}
}
RevealImage(rect); // display the new image
_firstRectangle = rect; // save it
_clickNo = 1;
}
DisplayScores();
}