橡皮区矩形 CRectTracker C# 实现

【 tulaoshi.com - C语言心得技巧 】

橡皮区矩形 CRectTracker C# 实现


作者：fanjunxing

下载源代码


本文要求读者熟悉 C#

开发环境： Visual Studio .NET 2003 Windows 2000

测试环境：Windows 2000

更新记录：2004.4.7 第一次更新

使用许可：代码是否免费使用

功能介绍：
　　在MFC中CRectTracker是一个很有用的类，可最近学习C#时，发现没有，于是就从MFC转换了一个供大家享用。



使用该类比较简单，几乎和 MFC中 的 CRectTracker 一样，在MDI中：

public class CReportDoc {...public CRectTracker m_tracker=null; public CReportDoc(MainWindow mainWin) { ...m_tracker=new CRectTracker(); m_tracker.m_rect.X = 10; m_tracker.m_rect.Y = 10;m_tracker.m_rect.Width = 91;m_tracker.m_rect.Height = 91; ...}...}      

public class CReportView : System.Windows.Forms.Form {     ...     private void InitializeComponent()      { ...this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.CReportView_MouseDown); this.Paint += new System.Windows.Forms.PaintEventHandler(this.PaintHandler); // 因为C#中不支持OnSetCursor所以只好用MouseMove替代了，// 各位兄台还有更好的方法，请告之this.MouseMove+=new MouseEventHandler(CReportView_MouseMove);      }     private void PaintHandler(Object sender, PaintEventArgs e)      {Graphics gs=e.Graphics; //其余的画图代码myDoc.m_tracker.OnDraw(gs);      }     private void CReportView_MouseDown(object sender,         MouseEventArgs e)      {     if(e.Button==MouseButtons .Left)      {Rectangle rectSave=new Rectangle(); Point pt=new Point(e.X,e.Y);myDoc.m_tracker.GetTrueRect(ref rectSave);if (myDoc.m_tracker.HitTest(pt) < 0) { // just to demonstrate CRectTracker::TrackRubberBand CRectTracker tracker=new CRectTracker();if (tracker.TrackRubberBand(this,  pt, myDoc.m_bAllowInvert)){   // see if rubber band intersects with the doc''s tracker tracker.NormalizeRect(ref tracker.m_rect);// so intersect rect worksif (tracker.m_rect.IntersectsWith(myDoc.m_tracker.m_rect)){  // if so, put resize handles on it (ie. select it) if ((myDoc.m_tracker.m_nStyle & CRectTracker.StyleFlags.resizeInside)!=0) {   // swap from resize inside to // resize outside for effectmyDoc.m_tracker.m_nStyle &= ~CRectTracker.StyleFlags.resizeInside; myDoc.m_tracker.m_nStyle |= CRectTracker.StyleFlags.resizeOutside;} else {// just use inside resize handles on first time myDoc.m_tracker.m_nStyle &=  ~CRectTracker.StyleFlags.resizeOutside; myDoc.m_tracker.m_nStyle |=  CRectTracker.StyleFlags.resizeInside; } }}myDoc.UpdateAllViews(null);      } } else {    if (myDoc.m_tracker.Track(this,  pt,           myDoc.m_bAllowInvert,null))     {   // normal tracking action, when tracker is "hit"myDoc.UpdateAllViews(null);    }}     }     private void CReportView_MouseMove(object sender, MouseEventArgs e)     {Point mousept=new Point(e.X,e.Y); if(!myDoc.m_tracker.SetCursor(this,0,mousept)) this.Cursor=Cursors.Arrow;     }     ...}