wpf 按住箭头键进行字符移动 C# .Net 问题
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/19824260/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Holding Arrow Keys Down For Character Movement C# .Net ISSUES
提问by Ryan Brady
So in short i'm simply trying to move a rectangle around a Canvas object in a WPF application. What i have here is my KeyDown event function. The problem is, when i hold a key down for long, it launches this function over and over again rapidly and screws up my rectangle location code.
所以简而言之，我只是想在 WPF 应用程序中围绕 Canvas 对象移动一个矩形。我这里有的是我的 KeyDown 事件函数。问题是，当我长时间按住某个键时，它会一遍又一遍地快速启动此功能并搞砸我的矩形位置代码。
My theory/logic behind it: BECAUSE WHEN YOU HOLD A BUTTON DOWN ON A KEYBOARD IT DOES NOT MOVE SMOOTHLY (TEST IT ON THE SCROLL BAR IN YOUR BROWSER, IT STARTS, pauses, THEN CONTINUES SMOOTHLY), i want it to start a forms timer that moves the object in the UI. Then when the KeyUp event happens, the timer STOPS.
我背后的理论/逻辑：因为当你按住键盘上的按钮时，它不会平滑移动（在浏览器中的滚动条上测试它，它开始，暂停，然后继续平滑），我希望它启动一个表格在 UI 中移动对象的计时器。然后当 KeyUp 事件发生时，计时器停止。
public void Window_KeyDown(object sender, KeyEventArgs e)
{
string msg;
string keystr = e.Key.ToString();
Key keyval = e.Key;
switch (keystr)
{
case "Down":
Console.WriteLine("Case 1");
Display.Content = "Down";
foreach (Character character in creatures)
{
//character.buttondown = true;
character.Position("Down");
}
break;
case "Up":
Console.WriteLine("Case 2");
Display.Content = "Up";
foreach (Character character in creatures)
{
//character.buttondown = true;
character.Position("Up");
}
break;
case "Left":
Console.WriteLine("Case 3");
Display.Content = "Left";
foreach (Character character in creatures)
{
//character.buttondown = true;
character.Position("Left");
}
break;
case "Right":
Display.Content = "Right";
foreach (Character character in creatures)
{
//character.buttondown = true;
character.Position("Right");
}
break;
}
}
public void Window_KeyUp(object sender, KeyEventArgs e)
{
Display.Content = "No key is pressed.";
foreach (Character character in creatures)
{
if (e.Key == Key.Right)
{
character.StopIt();
}
if (e.Key == Key.Left)
{
character.StopIt();
}
if (e.Key == Key.Up)
{
character.StopIt();
}
if (e.Key == Key.Down)
{
character.StopIt();
}
}
}
and just for reference if you need my rectangleclass code i'll post what happens if the RIGHT arrow key is pressed:
如果您需要我的矩形类代码，仅供参考，我将发布如果按下向右箭头键会发生什么：
Position is called
public void Position(String Direction) { if (Direction == "Right") { tmr = new System.Windows.Forms.Timer(); tmr.Interval = this.waitTime; tmr.Tick += new EventHandler(GoRight); tmr.Start(); } }GoRight is called:
public void GoRight(object sender, System.EventArgs e) { if (x < Background.ActualWidth - CharacterWidth) { if (goRight) { x += incrementSize; CharacterImage.SetValue(Canvas.LeftProperty, x); } if (x > Background.ActualWidth - CharacterWidth) { goRight = false; tmr.Stop(); } } }
位置被称为
public void Position(String Direction) { if (Direction == "Right") { tmr = new System.Windows.Forms.Timer(); tmr.Interval = this.waitTime; tmr.Tick += new EventHandler(GoRight); tmr.Start(); } }GoRight 被称为：
public void GoRight(object sender, System.EventArgs e) { if (x < Background.ActualWidth - CharacterWidth) { if (goRight) { x += incrementSize; CharacterImage.SetValue(Canvas.LeftProperty, x); } if (x > Background.ActualWidth - CharacterWidth) { goRight = false; tmr.Stop(); } } }
Finally, StopIt is called in the KeyUp event:
最后，在 KeyUp 事件中调用 StopIt：
public void StopIt()
{
tmr.Stop();
goRight = true;
goLeft = true;
goUp = true;
goDown = true;
}
I've only been learning c# for a couple months now so i'm trying to keep it relatively simple if possible, and only use .net.
我现在只学习了几个月的 c#，所以如果可能的话，我试图让它保持相对简单，并且只使用 .net。
Any help would be appreciated!!
任何帮助，将不胜感激！！
EDIT:: MY SOLUTION:
编辑::我的解决方案：
I simply made a while(flag) loop around my switch case. Then i set flag = false within the cases. When Key UP is pressed i set flag equal to true again. YAY
我只是在我的开关盒周围做了一个 while(flag) 循环。然后我在案例中设置 flag = false。当按下键 UP 时，我再次将标志设置为 true。好极了
采纳答案by Ben T
I assume that you want your character to move on the initial KeyDown event. Then you want to ignore any subsequent KeyDown events until you get a KeyUp event.
我假设您希望您的角色在初始 KeyDown 事件上移动。然后您想忽略任何后续的 KeyDown 事件，直到您获得 KeyUp 事件。
So you can ignore the subsequent KeyDown events by checking e.IsRepeat e.g.
所以你可以通过检查 e.IsRepeat 例如忽略后续的 KeyDown 事件
public void Window_KeyDown(object sender, KeyEventArgs e)
{
if (e.IsRepeat) return;
// rest of your code...
BTW, the non-smooth movement that you observe when scrolling an application is caused by the keyboard repeat delay. You can set this in the keyboard properties or though http://msdn.microsoft.com/en-us/library/system.windows.systemparameters.keyboarddelay.aspx
顺便说一句，您在滚动应用程序时观察到的非平滑移动是由键盘重复延迟引起的。您可以在键盘属性中或通过http://msdn.microsoft.com/en-us/library/system.windows.systemparameters.keyboarddelay.aspx 进行设置
回答by Dropn Fbombs
I don't know enough about WPF to tell you what is going on, though you may be correct about the push button/pause thing. It depends on how WPF treats keypresses. My guess would be that it does so the same way most Microsoft forms work; it has a pause to keep you from typing multiple characters at a time. There may be a way around this but I'm not sure.
我对 WPF 的了解还不够多，无法告诉您发生了什么，尽管您对按钮/暂停的事情可能是正确的。这取决于 WPF 如何处理按键。我的猜测是它的工作方式与大多数 Microsoft 表单的工作方式相同；它有一个暂停，以防止您一次输入多个字符。可能有办法解决这个问题，但我不确定。
What I will say though is that you should use something designed for games. When I first tried creating games I did so in a style similar to what you are doing and it doesn't work. What you are using is designed for office software and will not give you access to what you need; at least not without fighting and workarounds. As was suggested by Alex Beisley look into XNA. It's a dead language unfortunately but it died fairly recently. It uses c#, was made by Microsoft, and is powerful enough to do what you want without fighting you and easy enough to use once you get the hang of it. It's a shame to see it killed off.
不过我要说的是，您应该使用专为游戏设计的东西。当我第一次尝试创建游戏时，我的风格与您正在做的类似，但它不起作用。您使用的是专为办公软件设计的，不会让您访问所需的内容；至少不是没有战斗和变通方法。正如亚历克斯·贝斯利 (Alex Beisley) 所建议的那样，研究 XNA。不幸的是，它是一种死语言，但它最近死了。它使用由 Microsoft 制造的 c#，功能强大，可以做您想做的事，而无需与您争吵，而且一旦掌握了它，就很容易使用。看到它被杀死真是太可惜了。
If you want to torture yourself then I'd suggest going the route I've been trying which is to learn C++ and DirectX. It is not easy and you will need to be patient and go through multiple tutorials (no one tutorial seems to do a good job explaining anything). DirectX and C++ are not going anywhere soon, so they are a safe bet if you are looking to get into a long term language.
如果你想折磨自己，那么我建议走我一直在尝试的路线，即学习 C++ 和 DirectX。这并不容易，您需要耐心并阅读多个教程（似乎没有一个教程能很好地解释任何内容）。DirectX 和 C++ 不会很快消失，所以如果你想进入一种长期语言，它们是一个安全的赌注。
