Winforms-列表框-鼠标悬停-项目颜色

本文关键字:项目 颜色 悬停 鼠标 Winforms- 列表 | 更新日期: 2023-09-27 17:59:33

winformslistbox中聚焦项目时,如何更改项目的颜色?

我尝试使用listboxMouseHover事件。但什么也没发生。

private void lstNumbers_MouseHover(object sender, EventArgs e)
{
    Point point = lstNumbers.PointToClient(Cursor.Position);
    int index = lstNumbers.IndexFromPoint(point);
    if (index < 0) return;
    lstNumbers.GetItemRectangle(index).Inflate(1, 2);
}

Winforms-列表框-鼠标悬停-项目颜色

我从这个答案中得到了解决方案。

我们需要跟踪这个项目,

public partial class Form1 : Form
{
  private int _MouseIndex = -1;
  public Form1()
  { InitializeComponent(); }
  private void listBox1_DrawItem(object sender, DrawItemEventArgs e)
  {
    Brush textBrush = SystemBrushes.WindowText;
    if (e.Index > -1)
    {
      if (e.Index == _MouseIndex)
      {
        e.Graphics.FillRectangle(SystemBrushes.HotTrack, e.Bounds);
        textBrush = SystemBrushes.HighlightText;
      }
      else
      {
        if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)
        {
          e.Graphics.FillRectangle(SystemBrushes.Highlight, e.Bounds);
          textBrush = SystemBrushes.HighlightText;
        }
        else
          e.Graphics.FillRectangle(SystemBrushes.Window, e.Bounds);
      }
      e.Graphics.DrawString(listBox1.Items[e.Index].ToString(), e.Font, textBrush, e.Bounds.Left + 2, e.Bounds.Top);
    }
  }
  private void listBox1_MouseMove(object sender, MouseEventArgs e)
  {
    int index = listBox1.IndexFromPoint(e.Location);
    if (index != _MouseIndex)
    {
      _MouseIndex = index;
      listBox1.Invalidate();
    }
  }
  private void listBox1_MouseLeave(object sender, EventArgs e)
  {
    if (_MouseIndex > -1)
    {
      _MouseIndex = -1;
      listBox1.Invalidate();
    }
  }
}

我认为问题可能是你没有真正改变悬停在上面的物品的颜色:

lstNumbers.GetItemRectangle(index).Inflate(1, 2); //This is trying to inflate the item

你需要做点什么来改变颜色。

此外,还有ItemMouseHover事件,您可以利用它。类似于:

private void lstNumbers_ItemMouseHover(object sender, ListViewItemMouseHoverEventArgs e)
{
      e.Item.BackColor = Color.Green;
}

我希望这对你有帮助!