/// <summary>
/// 构造函数
/// </summary>
/// <param name="item">下拉框弹出窗体基类</param>
public UIDropDown(UIDropDownItem item)
{
Item = item ?? throw new ArgumentNullException(nameof(item));
Item.ValueChanged += DoValueChanged;
InitializeComponent();
AutoSize = false;
DoubleBuffered = true;
ResizeRedraw = true;
ToolStripControlHost _host = new ToolStripControlHost(item);
Padding = Margin = _host.Padding = _host.Margin = Padding.Empty;
item.MinimumSize = item.Size;
item.MaximumSize = item.Size;
Size = item.Size;
TabStop = item.TabStop = true;
item.Location = Point.Empty;
Items.Add(_host);
item.Disposed += (sender, e) =>
{
item = null;
Dispose(true);
};
item.RegionChanged += (sender, e) => UpdateRegion();
UpdateRegion();
}
/// <summary>
/// 析构函数
/// </summary>
/// <param name="disposing">disposing</param>
protected override void Dispose(bool disposing)
{
if (disposing)
{
components?.Dispose();
if (Item != null)
{
UIDropDownItem _content = Item;
Item = null;
_content.Dispose();
}
}
base.Dispose(disposing);
}
