Question

如何在 winforms listbox中关注项目时更改项目的颜色？

我尝试了MouseHover的{{1}}事件。但没有任何反应。

listbox

Answer 1

我从这个answer获得了解决方案。

我们需要跟踪项目，

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();
    }
  }
}

Answer 2

我认为问题可能是你实际上没有改变你悬停的物品的颜色：

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

您需要做些什么来改变颜色。

您还可以使用ItemMouseHover事件。类似的东西：

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

我希望这可以帮到你！

Winforms - 列表框 - MouseHover - 项目颜色

2 个答案: