检测用户是否正在滚动dataGridView滚动条

Question

我正在dataGridView使用新的DataTable 更新a

dataGridView1.DataSource = table

但是,当用户滚动dataGridView时,我不想这样做.如何检查滚动条是滚动还是滚动完成(即拖动而不是单击)？

我已经看过Scroll事件,但它似乎只是在第一次单击滚动条并且未完成时触发.谷歌搜索似乎也没有具体提到这一点.

Answer 1

我在过去通过对DataGridView类进行子类化并使用它而不是DataGridView来完成此操作.

public class DataGridViewEx : DataGridView
{
    public bool IsUserScrolling { get; private set; }

    private const int WM_HSCROLL = 0x0114;
    private const int WM_VSCROLL = 0x0115;
    private const int SB_ENDSCROLL = 8;

    public event EventHandler UserScrollComplete;

    protected virtual void OnUserScrollComplete()
    {
        EventHandler handler = UserScrollComplete;
        if (handler != null) handler(this, EventArgs.Empty);
    }

    protected override void WndProc(ref Message m)
    {
        // http://msdn.microsoft.com/en-us/library/windows/desktop/bb787575(v=vs.85).aspx
        // http://msdn.microsoft.com/en-us/library/windows/desktop/bb787577(v=vs.85).aspx
        if ((m.Msg == WM_HSCROLL) ||
            (m.Msg == WM_VSCROLL))
        {

            short loword = (short)(m.WParam.ToInt32() & 0xFFFF);

            if (loword == SB_ENDSCROLL)
            {
                IsUserScrolling = false;

                OnUserScrollComplete();
            }
            else
            {
                IsUserScrolling = true;
            }
        }
        base.WndProc(ref m);
    }
}