本文要求讀者熟悉 C#
開發環境: Visual Studio .NET 2003 Windows 2000
測試環境:Windows 2000
更新記錄:2004.4.7 第一次更新
使用許可:代碼是否免費使用
功能介紹:
在MFC中CRectTracker是一個很有用的類,可最近學習C#時,發現沒有,於是就從MFC轉換了一個供大家享用。
使用該類比較簡單,幾乎和 MFC中 的 CRectTracker 一樣,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; ... } ... }
相應的在VIEW類裡面
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); // 因為C#中不支持OnSetCursor所以只好用MouseMove替代了, // 各位兄台還有更好的方法,請告之 this.MouseMove+=new MouseEventHandler(CReportView_MouseMove); } private void PaintHandler(Object sender, PaintEventArgs e) { Graphics gs=e.Graphics; //其余的畫圖代碼 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; } ... }
結束。
本文示例代碼或素材下載