/// <summary>
/// 引发 ActiveChange 事件
/// </summary>
/// <param name="e">包含激活状态的 ActiveChangeEventArgs 参数</param>
protected virtual void OnActiveChange(ActiveChangeEventArgs e)
{
if (this.ActiveChange != null)
{
this.ActiveChange(this, e);
}
}
/// <summary>
/// 下拉列表激活或失去激活状态时引发的事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Drop_ActiveChange(object sender, ActiveChangeEventArgs e)
{
if (!e.Active)
{
this.CloseList();
}
}
/// <summary>
/// 处理 windows 消息
/// </summary>
/// <param name="m">windows 消息</param>
protected override void WndProc(ref Message m)
{
if (m.Msg == 0x18)
{
if (m.WParam == IntPtr.Zero)
{
ActiveChangeEventArgs e = new ActiveChangeEventArgs();
e.Active = false;
}
}
if (m.Msg == 0x1c || m.Msg == 0x86)
{
ActiveChangeEventArgs e = new ActiveChangeEventArgs();
e.Active = m.WParam == IntPtr.Zero ? false : true;
this.OnActiveChange(e);
}
base.WndProc(ref m);
}