自己写的一个分页控件(WinForm)

朱雀 2021-12-20 17:49 444阅读 0赞

找来找去没找个轻量级的分页控件,只好自己写一个凑合着先用。先看效果图：

![a.jpg][]

控件的功能很简单，点击控件的几个按钮、捕获 Item\_Click 事件、触发 PageIndexChanging 事件。

因此、必须要向此控件注册 PageIndexChanging 事件，在这个事件中,PageIndexChangingEventArgs 会传递新选择页的索引，根据这个索引值(NewPageIndex)就可以从数据库查询对应页的数据。

先初始化控件：

![ContractedBlock.gif][] ![ExpandedBlockStart.gif][] InitializingComponent

public  void  InitializingComponent()  
\{  
firtItem  =  new  ToolStripButton();  
firtItem.Image  =  CreateBitmap(FirstImage);  
firtItem.Name  =  " PageNavigatorMoveFirstItem " ;  
firtItem.ToolTipText  =  FirstTipText;  
  
previousItem  =  new  ToolStripButton();  
previousItem.Image  =  CreateBitmap(PreviousImage);  
previousItem.Name  =  " PageNavigatorMovePreviousItem " ;  
previousItem.ToolTipText  =  PreviousTipText;  
  
nextItem  =  new  ToolStripButton();  
nextItem.Image  =  CreateBitmap(NextImage);  
nextItem.Name  =  " PageNavigatorMoveNextItem " ;  
nextItem.ToolTipText  =  NextTipText;  
  
lastItem  =  new  ToolStripButton();  
lastItem.Image  =  CreateBitmap(LastImage);  
lastItem.Name  =  " PageNavigatorMoveLastItem " ;  
lastItem.ToolTipText  =  LastTipText;  
  
textItem  =  new  ToolStripTextBox();  
textItem.Name  =  " PageNavigatorTextItem " ;  
textItem.ToolTipText  =  ToolTipText;  
textItem.Size  =  new  Size( 45 ,  20 );  
labelItemPrefix  =  new  ToolStripLabel();  
labelItemPrefix.Text  =  " / " ;  
labelItemPrefix.Name  =  " PageNavigatorLabelPrefix " ;  
  
labelItem  =  new  ToolStripLabel();  
labelItem.Text  =  this .pageIndex.ToString();  
labelItem.Name  =  " PageNavigatorLabelItem " ;  
labelItem.ToolTipText  =  LabelTipText;  
  
labelItemEnd  =  new  ToolStripLabel();  
labelItemEnd.Text  =  "  页  " ;  
labelItemEnd.Name  =  " PageNavigatorLabelEnd " ;  
  
queryItem  =  new  ToolStripButton();  
queryItem.Image  =  CreateBitmap(QueryImage);  
queryItem.Name  =  " PageNavigatorQueryItem " ;  
queryItem.ToolTipText  =  QueryTipText;  
  
 this .Items.AddRange( new  ToolStripItem\[\] \{ firtItem, previousItem, nextItem, lastItem, textItem, labelItemPrefix, labelItem, labelItemEnd, queryItem \});  
\}

再看 Item\_Click 事件:

![ContractedBlock.gif][] ![ExpandedBlockStart.gif][] OnItemClicked

protected  override  void  OnItemClicked(ToolStripItemClickedEventArgs e)  
\{  
 base .OnItemClicked(e);  
  
 this .currentItem  =  e.ClickedItem;  
 switch  (e.ClickedItem.Name)  
\{  
 case  " PageNavigatorMoveFirstItem " :  
 if  (PageIndex  >  0 )  
\{  
pageIndex  =  0 ;  
\}  
 break ;  
 case  " PageNavigatorMovePreviousItem " :  
 if  (PageIndex  >  0 )  
\{ pageIndex \-- ; \}  
 break ;  
 case  " PageNavigatorMoveLastItem " :  
 if  (PageIndex  <  PageCount)  
\{  
pageIndex  =  PageCount  \-  1 ;  
\}  
 break ;  
 case  " PageNavigatorQueryItem " :  
ToolStripTextBox txt  =  this .Items\[ " PageNavigatorTextItem " \]  as  ToolStripTextBox;  
 if  (txt  !=  null )  
\{  
 if  ( ! ValidateInput(txt.Text.Trim()))  
\{  
MessageBox.Show( " 只能输入大于零的数字 " );  
 return ;  
\}  
  
 int  index  =  0 ;  
 int .TryParse(txt.Text,  out  index);  
index \-- ;  
  
 if  ( 0  <=  index  &&  index  <  PageCount)  
\{  
pageIndex  =  index;  
\}  
 else   
\{ MessageBox.Show( " 数字超出范围 " ); \}  
\}  
 break ;  
 default :  
 if  (PageIndex  <  PageCount)  
\{  
pageIndex \++ ;  
\}  
 break ;  
\}  
  
EnsureToolStripItemState(pageIndex);  
　　　　　　 //触发 PageIndexChanging 事件  
 PageIndexChangingEventArgs ee  =  new  PageIndexChangingEventArgs(pageIndex);  
OnPageIndexChanging(ee);  
\}

最后 PageIndexChanging 事件：

![ContractedBlock.gif][] ![ExpandedBlockStart.gif][] PageIndexChanging 事件

protected  virtual  void  OnPageIndexChanging(PageIndexChangingEventArgs e)  
\{  
var handler  =  Events\[pageIndexChangingKey\]  as  PageIndexChangingEventHandler;  
 if  (handler  !=  null )  
\{ handler( this , e); \}  
\}

控件的主体程序就这么多。

转载于:https://www.cnblogs.com/FrankYao/archive/2010/08/20/1804560.html

[a.jpg]: /images/20211220/cb980830b12943eea760fa36bb782be0.png
[ContractedBlock.gif]: https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif
[ExpandedBlockStart.gif]: /images/20211220/ee315c0ddfa448b18e7e87c3f1d3bb3e.png