在网上搜索文章后，我想出了一个基于 winforms 的触摸屏应用程序的设计，它需要像滚动一样的智能手机。该应用程序本身将在平板笔记本电脑或触摸屏台式机上运行。

• 我把我想滚动的所有内容都放在一个面板上。
• 将自动滚动设置为 true(这将显示滚动条)
• 现在将整个面板放在一个组框中
• 缩小分组框直到隐藏滚动条(视觉上隐藏，不可见 = false)

现在我陷入了有趣的部分。我想我必须处理面板上的 mousedown、mouseup 和 mousemove 以设置自动滚动位置，这样当有人触摸面板并拖动时，它就会滚动魔术。请帮助填写以下方法 stub 中的几行代码。 msdn doc on autoscrollposition 非常困惑，因为它返回负数，但需要使用 abs 设置为正数，什么不是。

Point mouseDownPoint;
Point mouseUpPoint;
Point mouseDragPoint;
 private void myPanel_MouseDown(object sender, MouseEventArgs e)
 {
    this.mouseDownPoint = e.Location;
    Console.WriteLine("Mouse down at {0}", e.location);
 }

 private void myPanel_MouseUp(object sender, MouseEventArgs e)
 {
    this.mouseUpPoint = e.Location;
    this.mouseDownPoint = new Point(); //will set for IsEmpty check
    Console.WriteLine("Mouse Up at {0}", e.location);
 }

 private void myPanel_MouseMove(object sender, MouseEventArgs e)
 {
    Console.WriteLine("Mouse at {0}", e.location);
    if (mouseDownPoint.IsEmpty()) //finger is off the touchscreen
       return;
    myPanel.Autocrollposition = ??
 }

谢谢

//UPDATE - 下面我有试错工作和测试代码。 (未重构)。如果有人有更优雅的解决方案，请发布。

    Point mouseDownPoint;
    private void innerpanel_MouseDown(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Left)
            this.mouseDownPoint = e.Location;
    }

    private void innerpanel_MouseMove(object sender, MouseEventArgs e)
    {
        if (e.Button != MouseButtons.Left)
            return;
        if ((mouseDownPoint.X == e.Location.X) && (mouseDownPoint.Y == e.Location.Y))
            return;

        Point currAutoS = innerpanel.AutoScrollPosition;
        if (mouseDownPoint.Y > e.Location.Y)
        {
            //finger slide UP
            if (currAutoS.Y != 0)
                currAutoS.Y = Math.Abs(currAutoS.Y) - 5;
        }
        else if (mouseDownPoint.Y < e.Location.Y)
        {
            //finger slide down
            currAutoS.Y = Math.Abs(currAutoS.Y) + 5;
        }
        else
        {
            currAutoS.Y = Math.Abs(currAutoS.Y);
        }

        if (mouseDownPoint.X > e.Location.X)
        {
            //finger slide left
            if (currAutoS.X != 0)
                currAutoS.X = Math.Abs(currAutoS.X) - 5;
        }
        else if (mouseDownPoint.X < e.Location.X)
        {
            //finger slide right
            currAutoS.X = Math.Abs(currAutoS.X) + 5;
        }
        else
        {
            currAutoS.X = Math.Abs(currAutoS.X);
        }
        innerpanel.AutoScrollPosition = currAutoS;
        mouseDownPoint = e.Location; //IMPORTANT

    }

最佳答案

作为一个组件:

public partial class TouchableFlowLayoutPanel : FlowLayoutPanel
{
    private bool _doTouchScroll;
    private Point _mouseStartPoint = Point.Empty;
    private Point _panelStartPoint = Point.Empty;

    /// <summary>
    ///     Initializes a new instance of the <see cref="TouchableFlowLayoutPanel" /> class.
    /// </summary>
    public TouchableFlowLayoutPanel()
    {
        InitializeComponent();

        Program.mouseFilter.MouseFilterDown += mouseFilter_MouseFilterDown;
        Program.mouseFilter.MouseFilterMove += mouseFilter_MouseFilterMove;
        Program.mouseFilter.MouseFilterUp += mouseFilter_MouseFilterUp;
    }

    /// <summary>
    ///     Initializes a new instance of the <see cref="TouchableFlowLayoutPanel" /> class.
    /// </summary>
    /// <param name="container">The container.</param>
    public TouchableFlowLayoutPanel(IContainer container)
    {
        container.Add(this);

        InitializeComponent();

        Program.mouseFilter.MouseFilterDown += mouseFilter_MouseFilterDown;
        Program.mouseFilter.MouseFilterMove += mouseFilter_MouseFilterMove;
        Program.mouseFilter.MouseFilterUp += mouseFilter_MouseFilterUp;
    }

    /// <summary>
    ///     Handles the MouseFilterDown event of the mouseFilter control.
    /// </summary>
    /// <param name="sender">The source of the event.</param>
    /// <param name="e">
    ///     The <see cref="MouseFilterEventArgs" /> instance containing the event data.
    /// </param>
    private void mouseFilter_MouseFilterDown(object sender, MouseFilterEventArgs e)
    {
        if (!_doTouchScroll && e.Button == MouseButtons.Left)
        {
            _mouseStartPoint = new Point(e.X, e.Y);
            _panelStartPoint = new Point(-AutoScrollPosition.X,
                                                 -AutoScrollPosition.Y);
        }
    }

    /// <summary>
    ///     Handles the MouseFilterMove event of the mouseFilter control.
    /// </summary>
    /// <param name="sender">The source of the event.</param>
    /// <param name="e">
    ///     The <see cref="MouseFilterEventArgs" /> instance containing the event data.
    /// </param>
    private void mouseFilter_MouseFilterMove(object sender, MouseFilterEventArgs e)
    {
        if (e.Button == MouseButtons.Left)
        {
            if (!_mouseStartPoint.Equals(Point.Empty))
            {
                int dx = (e.X - _mouseStartPoint.X);
                int dy = (e.Y - _mouseStartPoint.Y);

                if (_doTouchScroll)
                {
                    AutoScrollPosition = new Point(_panelStartPoint.X - dx,
                                                   _panelStartPoint.Y - dy);
                }
                else if (Math.Abs(dx) > 10 || Math.Abs(dy) > 10)
                {
                    _doTouchScroll = true;
                }
            }
        }
    }

    /// <summary>
    ///     Handles the MouseFilterUp event of the mouseFilter control.
    /// </summary>
    /// <param name="sender">The source of the event.</param>
    /// <param name="e">
    ///     The <see cref="MouseFilterEventArgs" /> instance containing the event data.
    /// </param>
    private void mouseFilter_MouseFilterUp(object sender, MouseFilterEventArgs e)
    {
        if (e.Button == MouseButtons.Left)
        {
            if (_doTouchScroll && !AutoScrollPosition.Equals(_panelStartPoint) &&
                !_panelStartPoint.Equals(Point.Empty))
            {
                // don't fire Click-Event
                e.Handled = true;
            }
            _doTouchScroll = false;
            _mouseStartPoint = Point.Empty;
            _panelStartPoint = Point.Empty;
        }
    }
}

internal class MouseFilter : IMessageFilter
{
    private const int WM_LBUTTONDOWN = 0x0201;
    private const int WM_LBUTTONUP = 0x0202;
    private const int WM_MOUSEMOVE = 0x0200;

    /// <summary>
    ///     Filters a message before sending it
    /// </summary>
    /// <param name="m">The message to be sent.This message can not be changed.</param>
    /// <returns>
    ///     true to filter the message and prevent it from being sent. false to allow the message to be sent to the next filter or control.
    /// </returns>
    public bool PreFilterMessage(ref Message m)
    {
        Point mousePosition = Control.MousePosition;
        var args = new MouseFilterEventArgs(MouseButtons.Left, 0, mousePosition.X, mousePosition.Y, 0);

        switch (m.Msg)
        {
            case WM_MOUSEMOVE:
                if (MouseFilterMove != null)
                {
                    MouseFilterMove(Control.FromHandle(m.HWnd), args);
                }
                break;

            case WM_LBUTTONDOWN:
                if (MouseFilterDown != null)
                {
                    MouseFilterDown(Control.FromHandle(m.HWnd), args);
                }
                break;

            case WM_LBUTTONUP:
                if (MouseFilterUp != null)
                {
                    MouseFilterUp(Control.FromHandle(m.HWnd), args);
                }
                break;
        }

        // Always allow message to continue to the next filter control
        return args.Handled;
    }

    /// <summary>
    ///     Occurs when [mouse filter up].
    /// </summary>
    public event MouseFilterEventHandler MouseFilterUp;

    /// <summary>
    ///     Occurs when [mouse filter down].
    /// </summary>
    public event MouseFilterEventHandler MouseFilterDown;

    /// <summary>
    ///     Occurs when [mouse filter move].
    /// </summary>
    public event MouseFilterMoveEventHandler MouseFilterMove;
}

internal delegate void MouseFilterEventHandler(object sender, MouseFilterEventArgs args);

internal delegate void MouseFilterMoveEventHandler(object sender, MouseFilterEventArgs args);

internal class MouseFilterEventArgs
{
    /// <summary>
    ///     Initializes a new instance of the <see cref="MouseFilterEventArgs" /> class.
    /// </summary>
    /// <param name="mouseButton">The mouse button.</param>
    /// <param name="clicks">The clicks.</param>
    /// <param name="x">The x.</param>
    /// <param name="y">The y.</param>
    /// <param name="delta">The delta.</param>
    public MouseFilterEventArgs(MouseButtons mouseButton, int clicks, int x, int y, int delta)
    {
        Button = mouseButton;
        Clicks = clicks;
        X = x;
        Y = y;
        Delta = delta;
        Handled = false;
    }

    /// <summary>
    ///     Gets or sets the button.
    /// </summary>
    /// <value>
    ///     The button.
    /// </value>
    public MouseButtons Button { get; set; }

    /// <summary>
    ///     Gets or sets a value indicating whether this <see cref="MouseFilterEventArgs" /> is handled.
    /// </summary>
    /// <value>
    ///     <c>true</c> if handled; otherwise, <c>false</c>.
    /// </value>
    public bool Handled { get; set; }

    /// <summary>
    ///     Gets or sets the X.
    /// </summary>
    /// <value>
    ///     The X.
    /// </value>
    public int X { get; set; }

    /// <summary>
    ///     Gets or sets the Y.
    /// </summary>
    /// <value>
    ///     The Y.
    /// </value>
    public int Y { get; set; }

    /// <summary>
    ///     Gets or sets the clicks.
    /// </summary>
    /// <value>
    ///     The clicks.
    /// </value>
    public int Clicks { get; set; }

    /// <summary>
    ///     Gets or sets the delta.
    /// </summary>
    /// <value>
    ///     The delta.
    /// </value>
    public int Delta { get; set; }
}

static class Program
{
    public static MouseFilter mouseFilter = new MouseFilter();

    /// <summary>
    /// Der Haupteinstiegspunkt für die Anwendung.
    /// </summary>
    [STAThread]
    static void Main()
    {
        Application.AddMessageFilter(mouseFilter);
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new MainForm());
    }
}

关于c# - 如何让智能手机像滚动 winforms 触摸屏应用程序一样(滚动面板)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/6963498/