自定義彈出控件(上)

系统管理员 2022-08-25 11:54 158阅读 0赞

自定義彈出控件(上)

原理:  
用ToolStripDropDown做為自定義控件的容器,在使用時只需調用相應事件彈出這個容器就可以了.  
自定義控件必須從ToolStripControlHost類派生,並用我們需要的一個控件進行初始化(這個控件可以是標準控件,也可以是用戶控件).  
製作步驟:  
1.定義好一個我們需要的控件或直接選擇一個標準控件.  
2.定義一個ToolStripControlHost派生類,並用先前定義的那個控件初始化.  
3.使用ToolStripDropDown作為容器,將ToolStripControlHost派生類裝入,在需要的地方按設定容器的大小並彈出這個容器.  
以下以製作一個DateTimeComboBox為例  
1.我們打算直接彈出一個MonthCalendar控件,所以這一步就不用做.  
2.定義ToolStripMonthCalendar,它繼承自ToolStripControlHost,並用一個MonthCalendar實例初始化,在這裡可以暴露MonthCalendar的一部分屬性和方法.

public  class  ToolStripMonthCalendar : ToolStripControlHost  
\{  
 //  Call the base constructor passing in a MonthCalendar instance.  
 // 用MonthCalendar初始化   
  public  ToolStripMonthCalendar() :  base ( new  MonthCalendar()) \{ \}  
  
 public  MonthCalendar MonthCalendarControl  
\{  
 get   
\{  
 return  Control  as  MonthCalendar;  
\}  
\}  
  
 //  Expose the MonthCalendar.FirstDayOfWeek as a property.  
 // 暴露FirstDayOfWeek屬性   
  public  Day FirstDayOfWeek  
\{  
 get   
\{  
 return  MonthCalendarControl.FirstDayOfWeek;  
\}  
 set   
\{  
value  =  MonthCalendarControl.FirstDayOfWeek;  
\}  
\}  
  
 //  Expose the AddBoldedDate method.  
 // 暴露AddBoldedDate方法   
  public  void  AddBoldedDate(DateTime dateToBold)  
\{  
MonthCalendarControl.AddBoldedDate(dateToBold);  
\}  
  
 //  Subscribe and unsubscribe the control events you wish to expose.  
 // 覆寫顯示下拉控件時調用的函數   
  protected  override  void  OnSubscribeControlEvents(Control c)  
\{  
 base .OnSubscribeControlEvents(c);  
  
 //  Cast the control to a MonthCalendar control.   
  MonthCalendar monthCalendarControl  =  (MonthCalendar)c;  
  
 //  Add the event.   
  monthCalendarControl.DateChanged  \+=  new  DateRangeEventHandler(OnDateChanged);  
\}  
 // 覆寫隱藏下拉控件時調用的函數   
  protected  override  void  OnUnsubscribeControlEvents(Control c)  
\{  
 base .OnUnsubscribeControlEvents(c);  
  
 //  Cast the control to a MonthCalendar control.   
  MonthCalendar monthCalendarControl  =  (MonthCalendar)c;  
  
 //  Remove the event.   
  monthCalendarControl.DateChanged  \-=  new  DateRangeEventHandler(OnDateChanged);  
\}  
  
 //  Declare the DateChanged event.  
 // 聲明日期變更事件   
  public  event  DateRangeEventHandler DateChanged;  
  
 //  Raise the DateChanged event.   
  private  void  OnDateChanged( object  sender, DateRangeEventArgs e)  
\{  
 if  (DateChanged  !=  null )  
\{  
DateChanged( this , e);  
\}  
\}  
\}

3.在指定位置彈出容器.

public  partial  class  DateTimeComboBox : ComboBox  
\{  
 private  const  UInt32 WM\_LBUTTONDOWN  =  0x201 ;  
 private  const  UInt32 WM\_LBUTTONDBLCLK  =  0x203 ;  
 private  const  UInt32 WM\_KEYF4  =  0x134 ;  
 private  const  UInt32 WM\_CTLCOLORLISTBOX  =  0x0134 ;  
ToolStripMonthCalendar myTSMonthCalendar;  
ToolStripDropDown tsDD;  
  
 public  DateTimeComboBox()  
\{  
InitializeComponent();  
myTSMonthCalendar  =  new  ToolStripMonthCalendar();  
tsDD  =  new  ToolStripDropDown();  
  
 //  事件調用,如果在彈出控件時並不想改變控件的屬性,這步可省略.   
  this .myTSMonthCalendar.MonthCalendarControl.DateChanged  \+=  new  System.Windows.Forms.DateRangeEventHandler( this .myTSMonthCalendar\_DateChanged);  
 this .myTSMonthCalendar.MonthCalendarControl.KeyDown  \+=  new  System.Windows.Forms.KeyEventHandler( this .myTSMonthCalendar\_KeyDown);  
\}  
  
 \#region  事件   
 private  void  myTSMonthCalendar\_DateChanged( object  sender, DateRangeEventArgs e)  
\{  
 this .Text  =  e.End.ToShortDateString();  
\}  
 private  void  myTSMonthCalendar\_KeyDown( object  sender, KeyEventArgs e)  
\{  
 if  (e.KeyCode  ==  Keys.Enter)  
 this .tsDD.Close();  
  
\}  
 \#endregion   
  
 \#region  方法,計算容器在彈出時的左上角坐標   
  
 // 這個函數有個點問題,它沒有考慮到彈出容器超出屏幕的情況.   
  private  Point CalculatePoz()  
\{  
Point point  =  new  Point( 0 ,  this .Height);  
  
 if  (( this .PointToScreen( new  Point( 0 ,  0 )).Y  \+  this .Height  \+  this .myTSMonthCalendar.Height)  >  Screen.PrimaryScreen.WorkingArea.Height)  
\{  
point.Y  =  \- this .myTSMonthCalendar.Height  \-  7 ;  
\}  
  
 return  point;  
\}  
 \#endregion   
  
 protected  override  void  WndProc( ref  Message m)  
\{  
 \#region  WM\_KEYF4   
 if  (m.Msg  ==  WM\_KEYF4)  
\{  
 this .Focus();  
 this .tsDD.Refresh();  
 if  ( ! this .tsDD.Visible)  
\{  
 try   
\{  
 if  ( this .Text  !=  "" )  
 this .myTSMonthCalendar.MonthCalendarControl.SetDate(Convert.ToDateTime( this .Text));  
\}  
 catch  (Exception)  
\{  
MessageBox.Show( " Data nu este in formatul corect! " );  
\}  
 // 在彈出容器中添加項目   
  tsDD.Items.Add( this .myTSMonthCalendar);  
 // 彈出容器   
  tsDD.Show( this ,  this .CalculatePoz());  
\}  
  
 return ;  
\}  
 \#endregion   
  
 \#region  WM\_LBUTTONDBLCLK   
 if  (m.Msg  ==  WM\_LBUTTONDBLCLK  ||  m.Msg  ==  WM\_LBUTTONDOWN)  
\{  
 if  ( ! this .tsDD.Visible)  
\{  
 try   
\{  
 if  ( this .Text  !=  "" )  
 this .myTSMonthCalendar.MonthCalendarControl.SetDate(Convert.ToDateTime( this .Text));  
\}  
 catch  (Exception)  
\{  
MessageBox.Show( " Data nu este in formatul corect! " );  
\}  
 // 在彈出容器中添加項目   
  tsDD.Items.Add( this .myTSMonthCalendar);  
 // 彈出容器   
  tsDD.Show( this ,  this .CalculatePoz());  
\}  
 return ;  
\}  
 \#endregion   
  
 base .WndProc( ref  m);  
\}  
\}

參考文獻:1.http://hi.baidu.com/pzy84/blog/item/22f4ef77bfd94619b151b92c.html