【发布时间】：2009-10-04 06:18:47
【问题描述】：
我正在尝试使用 WPF 使用 WiiMote 创建一个非常简单的 Simon 游戏版本。我一直坚持的是如何使它基于回合制，程序会阻塞，直到 GUI 完成显示序列。
这是我到目前为止的代码（主要基于此处的答案：WPF - sequential animation simple example）：
public partial class Window1 : Window
{
public enum SimonSquare { BLUE = 1, GREEN = 3, RED = 5, YELLOW = 7 };
List<int> _correctSequence;
int _currentLevel = 1;
Random random = new Random();
Wiimote _wiiMote;
List<int> _squaresEntered;
private IEnumerator<Action> _actions;
Rectangle blueRect;
Rectangle redRect;
Rectangle greenRect;
Rectangle yellowRect;
AutoResetEvent autoEvent;
public Window1()
{
InitializeComponent();
blueRect = new Rectangle() { Fill =
System.Windows.Media.Brushes.Blue, Name = "Blue"};
redRect = new Rectangle() { Fill =
System.Windows.Media.Brushes.Red, Name = "Red" };
greenRect = new Rectangle() { Fill =
System.Windows.Media.Brushes.Green, Name = "Green" };
yellowRect = new Rectangle() { Fill =
System.Windows.Media.Brushes.Yellow, Name = "Yellow" };
UniformGrid1.Children.Add(new Rectangle() { Fill =
System.Windows.Media.Brushes.LightGray });
UniformGrid1.Children.Add(blueRect);
UniformGrid1.Children.Add(new Rectangle() { Fill =
System.Windows.Media.Brushes.LightGray });
UniformGrid1.Children.Add(redRect);
UniformGrid1.Children.Add(new Rectangle() { Fill =
System.Windows.Media.Brushes.LightGray });
UniformGrid1.Children.Add(greenRect);
UniformGrid1.Children.Add(new Rectangle() { Fill =
System.Windows.Media.Brushes.LightGray });
UniformGrid1.Children.Add(yellowRect);
UniformGrid1.Children.Add(new Rectangle() { Fill =
System.Windows.Media.Brushes.LightGray });
//connectWiiRemote();
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
_actions = AnimationSequence().GetEnumerator();
autoEvent = new AutoResetEvent(false);
Thread thread = new Thread(RunNextAction);
thread.Start();
autoEvent.WaitOne(); // need to block here somehow!
int x = 5;
}
IEnumerable<Action> AnimationSequence()
{
getSequence();
foreach(int square in _correctSequence)
{
if(square == (int) SimonSquare.BLUE)
yield return () => animateCell(blueRect, Colors.Blue);
else if(square == (int) SimonSquare.RED)
yield return () => animateCell(redRect, Colors.Red);
else if (square == (int)SimonSquare.GREEN)
yield return () => animateCell(greenRect, Colors.Green);
else if (square == (int)SimonSquare.YELLOW)
yield return () => animateCell(yellowRect, Colors.Yellow);
}
}
private void animateCell(Rectangle rectangle, Color fromColor)
{
this.Dispatcher.BeginInvoke(new Action(delegate
{
Color toColor = Colors.White;
ColorAnimation ani = new ColorAnimation(toColor,
new Duration(TimeSpan.FromMilliseconds(300)));
ani.AutoReverse = true;
SolidColorBrush newBrush = new SolidColorBrush(fromColor);
ani.BeginTime = TimeSpan.FromSeconds(2);
rectangle.Fill = newBrush;
ani.Completed += (s, e) => RunNextAction();
newBrush.BeginAnimation(SolidColorBrush.ColorProperty, ani);
}));
}
private void RunNextAction()
{
if (_actions.MoveNext())
_actions.Current();
else
{
autoEvent.Set();
_currentLevel++;
}
}
private void getSequence()
{
_correctSequence = new List<int>();
int[] values =
Enum.GetValues(typeof(SimonSquare)).Cast<int>().ToArray();
for (int i = 0; i < _currentLevel + 2; i++)
{
_correctSequence.Add(values[random.Next(values.Length)]);
}
}
}
但是，autoSet 的 waitOne/set 不能正常工作。它当前调用 RunNextAction 一次，但随后无限期地阻塞在 waitOne 上。我做错了什么？
编辑： 让我试着重新表述这个问题。如果我取出 Threading 和 AutoResetEvent，在 Window_Loaded 我有：
private void Window_Loaded(object sender, RoutedEventArgs e)
{
_actions = AnimationSequence().GetEnumerator();
RunNextAction(); // shows all of the flashing squares
// need to wait here until the flashing squares are all shown
// process player's events etc.
}
当我运行上面的代码时，它会调用一次 RunNextAction，它会一直调用自己，直到所有的方块都显示出来（它似乎在它自己的线程上），但是 WindowLoaded 方法会继续运行。调用 RunNextAction() 后，我需要 Window_Loaded 阻塞，直到 RunNextAction 完全完成。
【问题讨论】：
-
您的意思是在播放动画时不接受输入？
-
@RCIX 是的，有点。由于 RunActionOnce 有点递归，我需要最后一次调用它（即显示最后一个方块）来通知调用者（Window_Loaded），以便它可以处理玩家的动作。
标签： c# wpf user-interface synchronization blocking