public int GetIndex(DropDownListItem item)
{
if (this.ucItemPanel.Controls.Contains(item))
{
return(this.ucItemPanel.Controls.GetChildIndex(item));
}
return(-1);
}
/// <summary>
/// 删除一项
/// </summary>
/// <param name="item"></param>
public void Remove(DropDownListItem item)
{
if (this.ucItemPanel.Controls.Contains(item))
{
this.ucItemPanel.Controls.Remove(item);
item.Click -= new EventHandler(DropDownListItem_Click);
}
}
void DropDownListItem_Click(object sender, EventArgs e)
{
DropDownListItem currentItem = sender as DropDownListItem;
if (ItemClicked != null)
{
ItemClicked(this, currentItem);
}
}
/// <summary>
/// 增加一项
/// </summary>
/// <param name="item"></param>
public void Add(DropDownListItem item)
{
if (!this.ucItemPanel.Controls.Contains(item))
{
this.ucItemPanel.Controls.Add(item);
this.ucItemPanel.Controls.SetChildIndex(item, this.ucItemPanel.Controls.Count - 1);
if (_linkedControl != null)
{
item.ForeColor = _linkedControl.ForeColor;
}
item.Click += new EventHandler(DropDownListItem_Click);
}
}
private void SetSelectedValue(DropDownListItem value)
{
bool hasChanged = selectedItem != value;
var previousItem = selectedItem;
selectedItem = value;
if (hasChanged)
{
if (selectedItem == null)
{
this.Text = string.Empty;
}
else
{
this.Text = selectedItem.Text;
}
if (this.SelectionChanged != null)
{
SelectionChanged(this, previousItem, selectedItem);
}
}
}
void frmDropDownList_ItemClicked(object sender, DropDownListItem e)
{
this.SelectedItem = e;
this.frmDropDownList.Hide();
}
public bool Contains(DropDownListItem item)
{
return(this.ucItemPanel.Controls.Contains(item));
}