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 works	if (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 effect	myDoc.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; } ...}