XPBalloonTip 控件的使用方法 (1)

   试图把 XP Common Controls 用到实际项目中时，发现气泡提示控件并不象想象中的那样工作。对于textbox来说还是可以正常工作的，但对于象combox box 、lable等控件就好象罢工了一样，为了达到能和 textbox 同样的气泡提示效果，自己补充了一点代码。
 
namespace HBus.Common
...{
    /**//// <summary>
    /// 气泡提示控件
    /// </summary>
    public class xpBalloonTipExtender:Steepvalley.Windows.Forms.APIEnhanced.XPBalloonTip,IDisposable
    ...{
        private System.Windows.Forms.TextBox txt = new System.Windows.Forms.TextBox();
        private System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer();
        private System.Windows.Forms.Control target = null;

        public xpBalloonTipExtender(System.Windows.Forms.Control parent)
            : base()
        ...{
            parent.Controls.Add(txt);
            txt.Visible = false;

            timer.Enabled = false;
            timer.Tick += new EventHandler(timer_Tick);
        }

        void timer_Tick(object sender, EventArgs e)
        ...{
            txt.Visible = false;
            timer.Enabled = false;
            if (target != null)
            ...{
                target.Focus();
            }
   target = null;
        }     

        private void Attach(System.Windows.Forms.Control ctrl)
        ...{
            txt.Width = 1;
            txt.BorderStyle = System.Windows.Forms.BorderStyle.None;
            txt.BackColor = ctrl.BackColor;
            txt.Location =  ctrl.Location;
            txt.Height = ctrl.Height;
            txt.Visible = true;

            target = ctrl;
        }

        private void Attach(System.Windows.Forms.Control ctrl, int timeout)
        ...{
            Attach(ctrl);
            timer.Interval = 1000 * timeout;
            timer.Enabled = true;
        }

        public new void Hide(System.Windows.Forms.Control ctrl)
        ...{
            if(this.target == ctrl)
            ...{
                base.Hide(txt);
                txt.Visible = false;
                if (target != null)
                ...{      target.Focus();
                }
                target = null;
            }            
        }