C按下鼠标按钮时如何循环

为了避免使用线程,可以添加 Timer 窗体/控件上的组件,只需在鼠标向下时启用它,在鼠标向上时禁用它。然后将通常放入循环中的代码放入计时器勾号事件中。如果要使用System.Timers.Timer,可以改用Timer.Elapsed事件。

示例(使用System.Timers.Timer):

using Timer = System.Timers.Timer;
using Systems.Timers;
using System.Windows.Forms;//WinForms example
private static Timer loopTimer;
private Button formButton;
public YourForm()
{ 
    //loop timer
    loopTimer = new Timer();
    loopTimer.Interval = 500;/interval in milliseconds
    loopTimer.Enabled = false;
    loopTimer.Elapsed += loopTimerEvent;
    loopTimer.AutoReset = true;
    //form button
    formButton.MouseDown += mouseDownEvent;
    formButton.MouseUp += mouseUpEvent;
}
private static void loopTimerEvent(Object source, ElapsedEventArgs e)
{
    //do whatever you want to happen while clicking on the button
}
private static void mouseDownEvent(object sender, MouseEventArgs e)
{
    loopTimer.Enabled = true;
}
private static void mouseUpEvent(object sender, MouseEventArgs e)
{
    loopTimer.Enabled = false;
}       

您可以使用一个线程来进行计数,并在释放鼠标时停止线程。以下内容对我来说非常有用:

var b = new Button { Text = "Press me" };

int counter = 0;
Thread countThread = null;
bool stop = false;

b.MouseDown += (s, e) =>
{
    stop = false;
    counter = 0;
    countThread = new Thread(() =>
    {
        while (!stop)
        {
            counter++;
            Thread.Sleep(100);
        }
    });
    countThread.Start();
};

b.MouseUp += (s, e) =>
{
    stop = true;
    countThread.Join();
    MessageBox.Show(counter.ToString());
};

当然,如果希望事件处理程序是方法而不是lambda,则必须将所有变量转换为字段。

    private void button1_MouseDown(object sender, MouseEventArgs e)
    {
        timer1.Enabled = true;
        timer1.Start();

    }

    private void button1_MouseUp(object sender, MouseEventArgs e)
    {
        timer1.Stop();
    }



    private void timer1_Tick(object sender, EventArgs e)
    {
        numericUpDown1.Value++;

    }

一 recent article from Fabulous Adventures in Coding 提供这种叙述,可能有助于回答您的问题:

令人惊讶的是,许多人对应用程序如何准确地响应Windows中的用户输入有着不可思议的信念。我向你保证这不是魔法。在Windows中构建交互式用户界面的方式非常简单。当发生什么事情时,比如说,鼠标点击一个按钮,操作系统就会记录下来。在某个时刻,一个进程询问操作系统“最近有什么有趣的事情发生吗?”操作系统会说“为什么是的,有人点击了这个东西”,然后这个过程会做任何合适的操作。所发生的一切取决于进程;它可以选择忽略单击,以自己特殊的方式处理它,或者告诉操作系统“继续执行,为这种事件做任何默认的事情”。所有这些通常都是由您将看到的一些最简单的代码驱动的:

while(GetMessage(&msg, NULL, 0, 0) > 0) 
{ 
  TranslateMessage(&msg); 
  DispatchMessage(&msg); 
}

就这样。在每个有UI线程的进程的中心,都有一个看起来非常像这个线程的循环。一个电话接下一条信息。对于您来说,该消息的级别可能太低;例如,它可能会说按下了具有特定键盘代码的键。您可能希望将其转换为“已按下numlock键”。翻译消息就是这样。可能有一些更具体的过程来处理这个消息。DispatchMessage将消息传递给相应的过程。

我想强调的是,这不是魔法。这是一个while循环。 It runs like any other while loop in C that you've ever seen . 循环反复调用三个方法,每个方法都读取或写入缓冲区,并在返回前执行一些操作。如果其中一个方法需要很长时间才能返回(通常DispatchMessage是长期运行的方法,因为它实际上是执行与消息相关联的工作的方法),那么猜猜怎么着?在操作系统返回通知之前,用户界面不会从操作系统获取、转换或分派通知。

我被我在这里读到的内容所启发,决定写我自己的button类,叫做repeatingbutton。首先单击它等待500毫秒,然后每300毫秒重复一次,直到2秒,然后每100毫秒重复一次(即它使用加速度)。

这是代码;

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;

/// <summary>
/// A repeating button class.
/// When the mouse is held down on the button it will first wait for FirstDelay milliseconds,
/// then press the button every LoSpeedWait milliseconds until LoHiChangeTime milliseconds,
/// then press the button every HiSpeedWait milliseconds
/// </summary>
public class RepeatingButton : Button
{
    /// <summary>
    /// Initializes a new instance of the <see cref="RepeatingButton"/> class.
    /// </summary>
    public RepeatingButton()
    {
        internalTimer = new Timer();
        internalTimer.Interval = FirstDelay;
        internalTimer.Tick += new EventHandler(internalTimer_Tick);
        this.MouseDown += new MouseEventHandler(RepeatingButton_MouseDown);
        this.MouseUp += new MouseEventHandler(RepeatingButton_MouseUp);
    }

    /// <summary>
    /// The delay before first repeat in milliseconds
    /// </summary>
    public int FirstDelay = 500;

    /// <summary>
    /// The delay in milliseconds between repeats before LoHiChangeTime
    /// </summary>
    public int LoSpeedWait = 300;

    /// <summary>
    /// The delay in milliseconds between repeats after LoHiChangeTime
    /// </summary>
    public int HiSpeedWait = 100;

    /// <summary>
    /// The changeover time between slow repeats and fast repeats in milliseconds
    /// </summary>
    public int LoHiChangeTime = 2000;

    private void RepeatingButton_MouseDown(object sender, MouseEventArgs e)
    {
        internalTimer.Tag = DateTime.Now;
        internalTimer.Start();
    }

    private void RepeatingButton_MouseUp(object sender, MouseEventArgs e)
    {
        internalTimer.Stop();
        internalTimer.Interval = FirstDelay;
    }

    private void internalTimer_Tick(object sender, EventArgs e)
    {
        this.OnClick(e);
        TimeSpan elapsed = DateTime.Now - ((DateTime)internalTimer.Tag);
        if (elapsed.TotalMilliseconds < LoHiChangeTime)
        {
            internalTimer.Interval = LoSpeedWait;
        }
        else
        {
            internalTimer.Interval = HiSpeedWait;
        }
    }

    private Timer internalTimer;
}

只要你有一个按钮,你就可以用一个重复的按钮替换它,它将有所有内置的新功能。

享受!

斯特伦

覆盖 OnMouseDown() 方法,如果按下所需按钮,则等于循环。例子:

protected override void OnMouseDown(MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left)
    {
        // this is your loop
    }
}

这不是传统意义上的循环,而是应该为你所需要的而工作。

你需要处理 MouseDown() 窗体的事件,使用 MouseEventArgs 用于确定按下哪个按钮的参数。

我已经好几年没发过这个了,但是有人投了赞成票,所以它在我的通知中出现了。现在我有了更多的LOL经验,我想我会看看这个简单的问题是否像听起来那么简单,它是:

public partial class Form1 : Form
{
    private bool _isRunning;

    public Form1()
    {
        InitializeComponent();
        txtValue.Text = @"0";

        btnTest.MouseDown += (sender, args) =>
        {
            _isRunning = true;
            Run();
        };

        btnTest.MouseUp += (sender, args) => _isRunning = false;
    }

    private void Run()
    {
        Task.Run(() =>
        {
            while (_isRunning)
            {
                var currentValue = long.Parse(txtValue.Text);
                currentValue++;
                txtValue.Invoke((MethodInvoker) delegate
                {
                    txtValue.Text = currentValue.ToString();
                });
            }
        });
    }
}

基于Steztric的回答,提出了一种扩展方法,其中修正了一些错误,并针对增长率提供了不同的选择。

/// <summary>
/// An extension method to add a repeat click feature to a button. Clicking and holding  on a button will cause it
/// to repeatedly fire. This is useful for up-down spinner buttons. Typically the longer the mouse is held, the
/// more quickly the click events are fired. There are different options when it comes to increasing the rate of
/// clicks:
/// 1) Exponential - this is the mode used in the NumericUpDown buttons. The first delay starts off around 650 ms
/// and each successive delay is multiplied by 75% of the current delay.
/// 2) Linear - the delay more slowly reaches the fastest repeat speed. Each successive delay subtracts a fixed
/// amount from the current delay. Decreases in delays occur half a second apart.
/// 3) Two Speed - this delay starts off at a slow speed, and then increases to a faster speed after a specified delay.
/// 4) Three Speed - the repeat speed can increase from slow, to medium, to fastest after a specified delay.
///
/// If repeating is added to a button that already has it, then it will be replaced with the new values.
/// </summary>
public static class RepeatingButtonEx {

    private static Hashtable ht = new Hashtable();
    private class Data {
        private static readonly System.Reflection.MethodInfo methodOnClick = null;
        static Data() {
            methodOnClick = typeof(Button).GetMethod("OnClick", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
        }

        public Button Button = null;
        private Timer Timer = new Timer();
        public double? GradientRate;
        public int? LinearGradient = null;
        public int FirstDelayMillis;
        public int FastestRepeatMillis;
        public int[] SwitchesMillis;
        public int[] SpeedsMillis;

        private DateTime lastEvent = DateTime.MinValue;
        private int millisCount = 0;
        private int currentSpeed = 0;
        private int waitSum = 0;

        public Data(Button button, double? gradientRate, int? linearGradient, int firstDelayMillis, int fastestRepeatMillis, int[] switchesMillis, int[] speedsMillis) {
            Button = button;
            GradientRate = gradientRate;
            LinearGradient = linearGradient;
            FirstDelayMillis = firstDelayMillis;
            FastestRepeatMillis = fastestRepeatMillis;
            SwitchesMillis = switchesMillis;
            SpeedsMillis = speedsMillis;
            Timer.Interval = firstDelayMillis;
            Timer.Tick += Timer_Tick;
            Button.MouseDown += Button_MouseDown;
            Button.MouseUp += Button_MouseUp;
            Button.MouseLeave += Button_MouseLeave;
        }

        void Button_MouseDown(object sender, MouseEventArgs e) {
            if (!Button.Enabled)
                return;

            lastEvent = DateTime.UtcNow;
            Timer.Start();
        }

        void Button_MouseUp(object sender, MouseEventArgs e) {
            Reset();
        }

        void Button_MouseLeave(object sender, EventArgs e) {
            Reset();
        }

        private void Reset() {
            Timer.Stop();
            Timer.Interval = FirstDelayMillis;
            millisCount = 0;
            currentSpeed = 0;
            waitSum = 0;
        }

        void Timer_Tick(object sender, EventArgs e) {
            if (!Button.Enabled) {
                Reset();
                return;
            }

            methodOnClick.Invoke(Button, new Object[] { EventArgs.Empty });
            //Button.PerformClick(); // if Button uses SetStyle(Selectable, false); then CanSelect is false, which prevents PerformClick from working.

            if (GradientRate.HasValue || LinearGradient.HasValue) {
                int millis = Timer.Interval;

                if (GradientRate.HasValue)
                    millis = (int) Math.Round(GradientRate.Value * millis);
                else if (LinearGradient.HasValue) {
                    DateTime now = DateTime.UtcNow;
                    var ts = now - lastEvent;
                    int ms = (int) ts.TotalMilliseconds;
                    millisCount += ms;
                    // only increase the rate every 500 milliseconds
                    // otherwise it appears too get to the maximum rate too quickly
                    if (millisCount >= 500) {
                        millis -= LinearGradient.Value;
                        millisCount -= 500;
                        lastEvent = now;
                    }
                }

                if (millis < FastestRepeatMillis)
                    millis = FastestRepeatMillis;

                Timer.Interval = millis;
            }
            else {
                if (currentSpeed < SpeedsMillis.Length) {
                    TimeSpan elapsed = DateTime.UtcNow - lastEvent; 
                    if (elapsed.TotalMilliseconds >= waitSum) {
                        waitSum += SwitchesMillis[currentSpeed];
                        Timer.Interval = SpeedsMillis[currentSpeed];
                        currentSpeed++;
                    }
                }
            }
        }

        public void Dispose() {
            Timer.Stop();
            Timer.Dispose();
            Button.MouseDown -= Button_MouseDown;
            Button.MouseUp -= Button_MouseUp;
            Button.MouseLeave -= Button_MouseLeave;
        }
    }

    ///<summary>The repeating speed becomes exponentially faster. This is the default behavior of the NumericUpDown control.</summary>
    ///<param name="button">The button to add the behavior.<param>
    ///<param name="firstDelayMillis">The delay before first repeat in milliseconds.</param>
    ///<param name="fastestRepeatMillis">The smallest delay allowed. Note: Masharling between the timer and the UI thread has an unavoidable limit of about 10 milliseconds.</param>
    ///<param name="gradientRate">The new interval is the current interval multiplied by the gradient rate.</param>
    public static void AddRepeatingExponential(this Button button, int firstDelayMillis = 500, int fastestRepeatMillis = 15, double gradientRate = 0.75) {
        AddRepeating(button, firstDelayMillis, fastestRepeatMillis, gradientRate, null, null, null);
    }

    ///<summary>The repeating speed becomes linearily faster.</param>
    ///<param name="button">The button to add the behavior.<param>
    ///<param name="firstDelayMillis">The delay before first repeat in milliseconds.</param>
    ///<param name="fastestRepeatMillis">The smallest delay allowed. Note: Masharling between the timer and the UI thread has an unavoidable limit of about 10 milliseconds.</param>
    ///<param name="linearGradient">If specified, the repeats gradually happen more quickly. The new interval is the current interval minus the linear gradient.</param>
    public static void AddRepeatingLinear(this Button button, int firstDelayMillis = 500, int fastestRepeatMillis = 50, int linearGradient = 25) {
        AddRepeating(button, firstDelayMillis, fastestRepeatMillis, null, linearGradient, null, null);
    }

    ///<summary>The repeating speed switches from the slow speed to the fastest speed after the specified amount of milliseconds.</summary>
    ///<param name="button">The button to add the behavior.<param>
    ///<param name="firstDelayMillis">The delay before first repeat in milliseconds.</param>
    ///<param name="fastestRepeatMillis">The smallest delay allowed. Note: Masharling between the timer and the UI thread has an unavoidable limit of about 10 milliseconds.</param>
    ///<param name="slowRepeatMillis">The delay in milliseconds between repeats when in the slow repeat state.</param>
    ///<param name="slowToFastestSwitchMillis">The delay in milliseconds before switching from the slow repeat speed to the fastest repeat speed.</param>
    public static void AddRepeatingTwoSpeed(this Button button, int firstDelayMillis = 500, int fastestRepeatMillis = 100, int slowRepeatMillis = 300, int slowToFastestSwitchMillis = 2000) {
        AddRepeating(button, firstDelayMillis, fastestRepeatMillis, null, null, new[] { slowRepeatMillis, fastestRepeatMillis }, new [] { slowToFastestSwitchMillis, 0 });
    }

    ///<summary>The repeating speed switches from the slow to medium to fastest at speed switch interval specified.</summary>
    ///<param name="button">The button to add the behavior.<param>
    ///<param name="firstDelayMillis">The delay before first repeat in milliseconds.</param>
    ///<param name="fastestRepeatMillis">The smallest delay allowed. Note: Masharling between the timer and the UI thread has an unavoidable limit of about 10 milliseconds.</param>
    ///<param name="slowRepeatMillis">The delay in milliseconds between repeats when in the slow repeat state.</param>
    ///<param name="mediumRepeatMillis">The delay in milliseconds between repeats when in the medium repeat state.</param>
    ///<param name="speedSwitchMillis">The delay in milliseconds before switching from one speed state to the next speed state.</param>
    public static void AddRepeatingThreeSpeed(this Button button, int firstDelayMillis = 500, int fastestRepeatMillis = 75, int slowRepeatMillis = 300, int mediumRepeatMillis = 150, int speedSwitchMillis = 2000) {
        AddRepeating(button, firstDelayMillis, fastestRepeatMillis, null, null, new[] { slowRepeatMillis, mediumRepeatMillis, fastestRepeatMillis }, new [] { speedSwitchMillis, speedSwitchMillis, 0 });
    }

    private static void AddRepeating(this Button button, int firstDelayMillis, int fastestRepeatMillis, double? gradientRate, int? linearGradient, int[] speedsMillis, int[] switchesMillis) {
        Data d = (Data) ht[button];
        if (d != null)
            RemoveRepeating(button);

        d = new Data(button, gradientRate, linearGradient, firstDelayMillis, fastestRepeatMillis, switchesMillis, speedsMillis);
        ht[button] = d;
        button.Disposed += delegate {
            RemoveRepeating(button);
        };
    }

    ///<summary>Removes the repeating behavior from the button.</summary>
    public static void RemoveRepeating(this Button button) {
        Data d = (Data) ht[button];
        if (d == null)
            return;

        ht.Remove(button);
        d.Dispose();
    }
}

您可以使用mousemove事件并检查mousebutton是否按下如下所示:

private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
    {
        if(e.Button==MouseButtons.Left)
        {
        //your code here
        }
    }

RepeatButton 非常适合:

<RepeatButton Delay="1000" Interval="500" HorizontalAlignment="Left" Content="+" Click="IncreaseButton_Click"/>

private void IncreaseButton_Click(object sender, RoutedEventArgs e)
{
    value1++;
}

类似于上面Timwi的解决方案,除了使用 async/await 对于异步IO和 lock 对于某些状态的同步…

using System;
using System.Windows.Forms;
using System.Threading.Tasks;

namespace Foo {
    partial class Form1: Form {
        private static readonly object mousePressLock = new object();
        private bool mousePressed;
        private Task task;

        private async Task MouseAction(Action action) {
            while (true) {
                lock (mousePressLock) {
                    if (mousePressed)
                        action();
                    else
                        break;
                }
                await Task.Delay(100).ConfigureAwait(false);
            }
        }

        private void PnlTranslate_Paint(object sender, PaintEventArgs e) {
        }

        private void Up_MouseUp(object sender, MouseEventArgs e) {
            lock (mousePressLock) { mousePressed = false; }
            task.Wait();
        }

        private void Up_MouseDown(object sender, MouseEventArgs e) {
            lock (mousePressLock) { mousePressed = true; }
            int cnt = 0;
            task = MouseAction(() => {
                Console.WriteLine($"mouse up action {++cnt}");
            });
        }

        public Form1() {
            InitializeComponent();
            mousePressed = false;
            task = null;
        }
    }
}

另外,请注意 ConfigureAwait(false) 打电话。我在没有BC的情况下陷入了僵局,任务是为了保持一致。真烦人。