Question

当在控件上按下鼠标按钮时，它不再触发任何事件。我需要这个，因为我想让自己通过“拖动”它来导航控件。

Drag事件也没有被激活。不知道为什么会这样。这毫无用处。我需要一个在鼠标移动时被触发的事件。它在哪里？

修改看，当您在Google-Map上按住鼠标左键时，您可以使用鼠标移动在地图上移动。我想用UserControl做同样的事情。我重写了OnPaint-Method，因此只显示一个网格。我还实现了使用键移动的功能。这一切都有效。现在我想通过按住鼠标左键并移动它来移动鼠标。它应该是容易和明显的，但事实并非如此。

所以我订阅了所有鼠标和拖动事件。像那样：

public partial class GameBoard : UserControl
{
    private int m_CellWidth = 5;
    private int m_CellHeight = 5;
    private Point m_Position = Point.Empty;
    private Point m_MousePoint = Point.Empty;

    public GameBoard()
    {
        InitializeComponent();
        ResizeRedraw = true;
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        base.OnPaint(e);

        Point firstPoint = new Point(m_Position.X % m_CellWidth, m_Position.Y % m_CellHeight);
        int countVisibleCols = (int)Math.Ceiling((double)((double)Width / (double)m_CellWidth));
        int countVisibleRows = (int)Math.Ceiling((double)((double)Height / (double)m_CellHeight));

        Pen artistsPen = new Pen(Brushes.Black);

        for (int i = 0; i < countVisibleCols; i++)
        {
            Point startPoint = new Point(firstPoint.X + i * m_CellWidth, 0);
            Point endPoint = new Point(firstPoint.X + i * m_CellWidth, Height);
            e.Graphics.DrawLine(artistsPen, startPoint, endPoint);
        }

        for (int i = 0; i < countVisibleRows; i++)
        {
            Point startPoint = new Point(0, firstPoint.Y + i * m_CellHeight);
            Point endPoint = new Point(Width, firstPoint.Y + i * m_CellHeight);
            e.Graphics.DrawLine(artistsPen, startPoint, endPoint);
        }
    }

    private void GameBoard_MouseUp(object sender, MouseEventArgs e)
    {

    }

    private void GameBoard_MouseMove(object sender, MouseEventArgs e)
    {

    }

    private void GameBoard_MouseLeave(object sender, EventArgs e)
    {

    }

    private void GameBoard_MouseHover(object sender, EventArgs e)
    {

    }

    private void GameBoard_MouseEnter(object sender, EventArgs e)
    {

    }

    private void GameBoard_MouseDown(object sender, MouseEventArgs e)
    {

    }

    private void GameBoard_MouseDoubleClick(object sender, MouseEventArgs e)
    {

    }

    private void GameBoard_MouseClick(object sender, MouseEventArgs e)
    {

    }

    private void GameBoard_DragDrop(object sender, DragEventArgs e)
    {

    }

    private void GameBoard_DragEnter(object sender, DragEventArgs e)
    {

    }

    private void GameBoard_DragOver(object sender, DragEventArgs e)
    {

    }

    private void GameBoard_DragLeave(object sender, EventArgs e)
    {

    }
}

（实际订阅发生在设计师中。）问题是：如果点击鼠标左键并且点击了鼠标左键。坚持我的控制，没有一个事件被解雇了。所以我不知道如何实现所需的功能。

Answer 1

使用MouseMove()事件。您可以使用e.Button参数确定在移动过程中左按钮是否已关闭。这是一个带按钮的例子：

    private void button1_MouseMove(object sender, MouseEventArgs e)
    {
        if (e.Button == System.Windows.Forms.MouseButtons.Left)
        {
            this.Text = "Left: " + e.X.ToString() + ", " + e.Y.ToString();
        }
        else if (e.Button == System.Windows.Forms.MouseButtons.None)
        {
            this.Text = e.X.ToString() + ", " + e.Y.ToString();
        }   
    }

然而，并非所有控件的行为都相同。详细了解您尝试使用哪种控件以及如何使用。

Answer 2

在表单的Visual Studio设计器中，组件的“属性”窗口中有一个“事件”按钮，通常看起来像闪电。您可以使用它将事件绑定到函数。这会丢失吗？

按下鼠标按钮时不会触发鼠标事件

2 个答案: