15

当在选中列表框中单击一个项目时，它会突出显示。如何防止这种突出显示效果？

我可以连接到 SelectedIndexChanged 事件并清除选择，但突出显示仍然发生并且您会看到一个光点。事实上，如果您按住鼠标单击，在单击复选框区域后从不释放它，则选择会保持突出显示，直到您释放鼠标按钮。我基本上想完全摆脱这种突出效果。

4

5 回答 5

29

使用以下内容：

private void checkedListBox1__SelectedIndexChanged(object sender, EventArgs e)
        {
            checkedListBox1.ClearSelected();
        }
于 2012-06-08T10:19:24.200 回答
13

除了你仍然得到虚线位之外，这将做到这一点。

this.checkedListBox1.SelectionMode = System.Windows.Forms.SelectionMode.None;

尽管现在您无法单击复选框...所以您必须执行以下操作：

  private void checkedListBox1_Click(object sender, EventArgs e)
    {
        for (int i = 0; i < checkedListBox1.Items.Count; i++)
        {


          if (checkedListBox1.GetItemRectangle(i).Contains(checkedListBox1.PointToClient(MousePosition)))
          {
              switch (checkedListBox1.GetItemCheckState(i))
              {
                  case CheckState.Checked:
                      checkedListBox1.SetItemCheckState(i, CheckState.Unchecked);
                      break;
                  case CheckState.Indeterminate:
                  case CheckState.Unchecked:
                      checkedListBox1.SetItemCheckState(i, CheckState.Checked);
                       break;
              } 

          }

        }
    }

如果这一切都不是你所追求的……你总是可以自己做一个。它是一个相当简单的控件。

于 2008-12-02T16:54:51.970 回答
7

将 SelectionMode 设置为 None 有一些奇怪的问题，例如必须实现 Click 事件。您可以将 SelectionMode 设置为 single，然后创建一个仅使用 OnDrawItem 覆盖 CheckedListBox 的类。请注意，为了关闭选定的外观，您必须关闭 Selected 状态并将颜色设置为您想要的颜色。您可以像我在这里所做的那样从控件中获取原始颜色。这就是我想出的，应该让你开始让它看起来像你想要的那样。

public partial class EnhancedCheckedListBox : CheckedListBox
{
    /// <summary>Overrides the OnDrawItem for the CheckedListBox so that we can customize how the items are drawn.</summary>
    /// <param name="e">The System.Windows.Forms.DrawItemEventArgs object with the details</param>
    /// <remarks>A CheckedListBox can only have one item selected at a time and it's always the item in focus.
    /// So, don't draw an item as selected since the selection colors are hideous.  
    /// Just use the focus rect to indicate the selected item.</remarks>
    protected override void OnDrawItem(DrawItemEventArgs e)
    {
        Color foreColor = this.ForeColor;
        Color backColor = this.BackColor;

        DrawItemState s2 = e.State;

        //If the item is in focus, then it should always have the focus rect.
        //Sometimes it comes in with Focus and NoFocusRect.
        //This is annoying and the user can't tell where their focus is, so give it the rect.
        if ((s2 & DrawItemState.Focus) == DrawItemState.Focus)
        {
            s2 &= ~DrawItemState.NoFocusRect;
        }

        //Turn off the selected state.  Note that the color has to be overridden as well, but I just did that for all drawing since I want them to match.
        if ((s2 & DrawItemState.Selected) == DrawItemState.Selected)
        {
            s2 &= ~DrawItemState.Selected;

        }

        //Console.WriteLine("Draw " + e.Bounds + e.State + " --> " + s2);

        //Compile the new drawing args and let the base draw the item.
        DrawItemEventArgs e2 = new DrawItemEventArgs(e.Graphics, e.Font, e.Bounds, e.Index, s2, foreColor, backColor);
        base.OnDrawItem(e2);
    }
}
于 2012-02-04T21:49:05.473 回答
0

哦，酷添加将来自Hath的答案中的所有代码放在一个

 checkedListBox1_MouseMove(object sender, MouseEventArgs e)

如果鼠标按钮位在开关中，则添加

case CheckState.Checked:
   if (e.Button == MouseButtons.Right)
   {
       checkedListBox1.SetItemCheckState(i, CheckState.Unchecked);
   }                     
   break;

和

case CheckState.Unchecked:
   if (e.Button == MouseButtons.Left)
   {
       checkedListBox1.SetItemCheckState(i, CheckState.Checked);
   }
   break;

它会在您按下左键移动鼠标时检查突出显示的项目，并用右键取消突出显示它们

于 2014-07-04T10:42:23.597 回答
0

我在这里给出答案有点晚了。无论如何，这将取消选中所有复选框并删除突出显示效果：

foreach (int i in clb.CheckedIndices)  //clb is your checkListBox
    clb.SetItemCheckState(i, CheckState.Unchecked);
clb.SelectionMode = System.Windows.Forms.SelectionMode.None;
clb.SelectionMode = System.Windows.Forms.SelectionMode.One;
  • 取消选中所有复选框
  • 禁用 checkListBox 的选择
  • 启用 checkListBox 的选择
于 2017-02-19T12:54:10.223 回答