C#实现Dev Grid拖拽移动行的方法

拖拽时带行截图效果

实现代码如下：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630

/// <summary> /// 拖拽帮助类 /// </summary> public static class DragHelper {   /// <summary>   /// BandedGridView 拖拽   /// </summary>   /// <param name="gvMain"></param>   public static void DragGridRow<T>(this BandedGridView gvMain)   {    // 拖拽遮罩控件    DragMaster dragMaster = new DragMaster();    // 当前拖拽行绘画区域    Rectangle _DragRowRect = Rectangle.Empty;    GridControl gcMain = gvMain.GridControl;    GridHitInfo _DownHitInfo = null;    //表格属性 允许拖拽    gcMain.AllowDrop = true;    gvMain.OptionsDetail.EnableMasterViewMode = false;    #region 将对象拖至边界时发生 DragOver    gcMain.DragOver += delegate(object sender, System.Windows.Forms.DragEventArgs e)    {     if (e.Data.GetDataPresent(typeof(T)))      e.Effect = DragDropEffects.Move;     else      e.Effect = DragDropEffects.None;    };    #endregion    #region 拖拽完成时处理数据 DragDrop    gcMain.DragDrop += delegate(object sender, System.Windows.Forms.DragEventArgs e)    {     // 拖过来的新数据     T newRow = (T)e.Data.GetData(typeof(T));     // 原来在此坐标的数据     // e的坐标是相对于屏幕的     var clientPoint = gcMain.PointToClient(new Point(e.X, e.Y));     GridHitInfo hitInfo = gvMain.CalcHitInfo(new Point(clientPoint.X, clientPoint.Y));     var oldRow = (T)gvMain.GetRow(hitInfo.RowHandle);     // 如果相等则不处理     if (oldRow == null || newRow == null) return;     // 且目标位置不是最后一行的话要将所有序号重排     // 原来的行号     var oldIndex = _DownHitInfo.RowHandle;     // 新的行号     var newIndex = hitInfo.RowHandle;     BindingSource bs = (BindingSource)(gcMain.DataSource);     if (bs == null)      return;     bs.RemoveAt(oldIndex);     bs.Insert(oldIndex, oldRow);     bs.RemoveAt(newIndex);     bs.Insert(newIndex, newRow);     bs.ResetBindings(false);    };    #endregion    #region 鼠标按下 MouseDown    gcMain.MouseDown += delegate(object sender, MouseEventArgs e)    {     _DownHitInfo = null;     GridHitInfo hitInfo = gvMain.CalcHitInfo(new Point(e.X, e.Y));     if (Control.ModifierKeys != Keys.None) return;     if (e.Button == MouseButtons.Left && hitInfo.RowHandle >= 0)     {      // 禁用的Grid不支持拖拽      if (!gvMain.OptionsBehavior.Editable       || gvMain.OptionsBehavior.ReadOnly)       return;      // 只有点击最前面才能拖拽      if (hitInfo.InRowCell)       return;      // 缓存      _DownHitInfo = hitInfo;     }    };    #endregion    #region 鼠标移动 MouseMove    gcMain.MouseMove += delegate(object sender, MouseEventArgs e)    {     if (e.Button == MouseButtons.Left)     {      if (_DownHitInfo != null)      {       Size dragSize = SystemInformation.DragSize;       // 偏离区域       Rectangle dragRect = new Rectangle(new Point(_DownHitInfo.HitPoint.X - dragSize.Width / 2, _DownHitInfo.HitPoint.Y - dragSize.Height / 2), dragSize);       if (!dragRect.Contains(new Point(e.X, e.Y)))       {        // 屏幕坐标        var p = gcMain.PointToScreen(e.Location);        // 刷新是必须要的        gcMain.Refresh();        // 获取当前行截图        var bmp = GetDragRowImage(gcMain, _DownHitInfo, _DragRowRect);        Point offSetPoint = new Point(p.X + 1, p.Y - dragMaster.DragSize.Height / 2);        // 开始显示拖拽遮罩        dragMaster.StartDrag(bmp, offSetPoint, DragDropEffects.Move);        // 获取要拖拽的数据        object row = gvMain.GetRow(_DownHitInfo.RowHandle);        // 开始拖拽        gcMain.DoDragDrop(row, DragDropEffects.Move);        // 取消事件        DevExpress.Utils.DXMouseEventArgs.GetMouseArgs(e).Handled = true;        // 清空缓存        _DownHitInfo = null;       }      }     }    };    #endregion    #region 在用鼠标拖动某项时发生，是否允许继续拖放 QueryContinueDrag    gcMain.QueryContinueDrag += delegate(object sender, QueryContinueDragEventArgs e)    {     switch (e.Action)     {      case DragAction.Continue:       // 移动遮罩       Point offSetPoint = new Point(Cursor.Position.X + 1, Cursor.Position.Y - dragMaster.DragSize.Height / 2);       dragMaster.DoDrag(offSetPoint, DragDropEffects.Move, false);       break;      default:       // 清空       _DragRowRect = Rectangle.Empty;       // 停止拖动       dragMaster.EndDrag();       break;     }    };    #endregion    #region 点击行头移动行    gvMain.CustomDrawRowIndicator += delegate(object sender, RowIndicatorCustomDrawEventArgs e)    {     if (_DragRowRect == Rectangle.Empty && _DownHitInfo != null && _DownHitInfo.RowHandle == e.RowHandle)     {      _DragRowRect = e.Bounds;     }    };    #endregion   }   /// <summary>   /// GridView 拖拽   /// </summary>   /// <param name="gvMain"></param>   public static void DragGridRow<T>(this GridView gvMain)   {    // 拖拽遮罩控件    DragMaster dragMaster = new DragMaster();    // 当前拖拽行绘画区域    Rectangle _DragRowRect = Rectangle.Empty;    GridControl gcMain = gvMain.GridControl;    GridHitInfo _DownHitInfo = null;    //表格属性 允许拖拽    gcMain.AllowDrop = true;    gvMain.OptionsDetail.EnableMasterViewMode = false;    #region 将对象拖至边界时发生 DragOver    gcMain.DragOver += delegate(object sender, System.Windows.Forms.DragEventArgs e)    {     if (e.Data.GetDataPresent(typeof(T)))      e.Effect = DragDropEffects.Move;     else      e.Effect = DragDropEffects.None;    };    #endregion    #region 拖拽完成时处理数据 DragDrop    gcMain.DragDrop += delegate(object sender, System.Windows.Forms.DragEventArgs e)    {     // 拖过来的新数据     T newRow = (T)e.Data.GetData(typeof(T));     // 原来在此坐标的数据     // e的坐标是相对于屏幕的     var clientPoint = gcMain.PointToClient(new Point(e.X, e.Y));     GridHitInfo hitInfo = gvMain.CalcHitInfo(new Point(clientPoint.X, clientPoint.Y));     var oldRow = (T)gvMain.GetRow(hitInfo.RowHandle);     // 如果相等则不处理     if (oldRow == null || newRow == null) return;     // 且目标位置不是最后一行的话要将所有序号重排     // 原来的行号     var oldIndex = _DownHitInfo.RowHandle;     // 新的行号     var newIndex = hitInfo.RowHandle;       BindingSource bs = (BindingSource)(gcMain.DataSource);     if (bs == null)      return;       bs.RemoveAt(oldIndex);     bs.Insert(oldIndex, oldRow);     bs.RemoveAt(newIndex);     bs.Insert(newIndex, newRow);     bs.ResetBindings(false);    };    #endregion    #region 鼠标按下 MouseDown    gcMain.MouseDown += delegate(object sender, MouseEventArgs e)    {     _DownHitInfo = null;     GridHitInfo hitInfo = gvMain.CalcHitInfo(new Point(e.X, e.Y));     if (Control.ModifierKeys != Keys.None) return;     if (e.Button == MouseButtons.Left && hitInfo.RowHandle >= 0)     {      // 禁用的Grid不支持拖拽      if (!gvMain.OptionsBehavior.Editable       || gvMain.OptionsBehavior.ReadOnly)       return;      // 只有点击最前面才能拖拽      if (hitInfo.InRowCell)       return;      // 缓存      _DownHitInfo = hitInfo;     }    };    #endregion    #region 鼠标移动 MouseMove    gcMain.MouseMove += delegate(object sender, MouseEventArgs e)    {     if (e.Button == MouseButtons.Left)     {      if (_DownHitInfo != null)      {       Size dragSize = SystemInformation.DragSize;       // 偏离区域       Rectangle dragRect = new Rectangle(new Point(_DownHitInfo.HitPoint.X - dragSize.Width / 2, _DownHitInfo.HitPoint.Y - dragSize.Height / 2), dragSize);         if (!dragRect.Contains(new Point(e.X, e.Y)))       {        // 屏幕坐标        var p = gcMain.PointToScreen(e.Location);        // 刷新是必须要的        gcMain.Refresh();        // 获取当前行截图        var bmp = GetDragRowImage(gcMain, _DownHitInfo, _DragRowRect);        Point offSetPoint = new Point(p.X + 1, p.Y - dragMaster.DragSize.Height / 2);        // 开始显示拖拽遮罩        dragMaster.StartDrag(bmp, offSetPoint, DragDropEffects.Move);        // 获取要拖拽的数据        object row = gvMain.GetRow(_DownHitInfo.RowHandle);        // 开始拖拽        gcMain.DoDragDrop(row, DragDropEffects.Move);        // 取消事件        DevExpress.Utils.DXMouseEventArgs.GetMouseArgs(e).Handled = true;        // 清空缓存        _DownHitInfo = null;       }      }     }    };    #endregion    #region 在用鼠标拖动某项时发生，是否允许继续拖放 QueryContinueDrag    gcMain.QueryContinueDrag += delegate(object sender, QueryContinueDragEventArgs e)    {     switch (e.Action)     {      case DragAction.Continue:       // 移动遮罩       Point offSetPoint = new Point(Cursor.Position.X + 1, Cursor.Position.Y - dragMaster.DragSize.Height / 2);       dragMaster.DoDrag(offSetPoint, DragDropEffects.Move, false);       break;      default:       // 清空       _DragRowRect = Rectangle.Empty;       // 停止拖动       dragMaster.EndDrag();       break;     }    };    #endregion    #region 点击行头移动行    gvMain.CustomDrawRowIndicator += delegate(object sender, RowIndicatorCustomDrawEventArgs e)    {     if (_DragRowRect == Rectangle.Empty && _DownHitInfo != null && _DownHitInfo.RowHandle == e.RowHandle)     {      _DragRowRect = e.Bounds;     }    };    #endregion    }   /// <summary>   /// 获取拖拽截图   /// </summary>   /// <param name="hitInfo"></param>   /// <param name="gcMain"></param>   /// <param name="dragRowRect"></param>   /// <returns></returns>   private static Bitmap GetDragRowImage(GridControl gcMain, GridHitInfo hitInfo, Rectangle dragRowRect)   {    // 截图    var bmp = DevImageCapturer.GetControlBitmap(gcMain, null    , dragRowRect.Width + 1, dragRowRect.Top    , gcMain.Width - dragRowRect.Width - 4, dragRowRect.Height - 1);      using (Graphics g = Graphics.FromImage(bmp))    {     var p1 = new Point(1, 1);     var p2 = new Point(bmp.Width - 1, 1);     var p3 = new Point(1, bmp.Height - 2);     var p4 = new Point(bmp.Width - 1, bmp.Height - 2);     using (Pen pen = new Pen(gcMain.ForeColor))     {      g.DrawLine(pen, p1, p2);      g.DrawLine(pen, p1, p3);      g.DrawLine(pen, p2, p4);      g.DrawLine(pen, p3, p4);     }    }    return bmp;   } } /// <summary> /// 拖拽窗口 /// </summary> public partial class DragWindow : DevExpress.Utils.Win.TopFormBase {   private Bitmap dragBitmap;   private bool dragging;   private Point hotSpot;   public static readonly Point InvisiblePoint = new Point(-100000, -100000);   public DragWindow()   {    hotSpot = Point.Empty;    dragging = false;    SetStyle(ControlStyles.Selectable, false);    this.Size = Size.Empty;    this.ShowInTaskbar = false;    Form prevActive = Form.ActiveForm;    InitializeComponent();   }   void ActivateForm(object sender, EventArgs e)   {    Form form = sender as Form;    if (form == null || !form.IsHandleCreated) return;    form.Activate();   }   public void MakeTopMost()   {    UpdateZOrder();   }   private void InitializeComponent()   {    this.StartPosition = FormStartPosition.Manual;    dragBitmap = null;    this.Enabled = false;    this.MinimumSize = Size.Empty;    this.Size = Size.Empty;    this.Location = InvisiblePoint;    this.Visible = false;    this.TabStop = false;    //this.Opacity = 0.7;// DevExpress.Utils.DragDrop.DragWindow.DefaultOpacity;   }   protected void InternalMoveBitmap(Point p)   {    //p.Offset(-hotSpot.X, -hotSpot.Y);    this.SuspendLayout();    this.Location = p;    this.ResumeLayout();   }   protected override void OnResize(System.EventArgs e)   {    base.OnResize(e);   }   public bool ShowDrag(Point p)   {    if (this.BackgroundImage == null) return false;    dragging = true;    Visible = true;    Refresh();    InternalMoveBitmap(p);    return true;   }   public bool MoveDrag(Point p)   {    if (!dragging) return false;    InternalMoveBitmap(p);    return true;   }   public bool HideDrag()   {    if (!dragging) return false;    Visible = false;    BackgroundImage = null;    dragging = false;    this.SuspendLayout();    this.Size = Size.Empty;    this.Location = InvisiblePoint;    this.ResumeLayout();    return true;   }   public Point HotSpot { get { return hotSpot; } set { hotSpot = value; } }   public Bitmap DragBitmap   {    get { return dragBitmap; }    set    {     this.BackgroundImage = value;     if (value == null)     {      HideDrag();     }     else      hotSpot = new Point(value.Size.Width / 2, value.Size.Height / 2);     dragBitmap = value;     Size = BackgroundImage.Size;    }   } } /// <summary> /// 截图 /// </summary> public class DevImageCapturer {   [System.Runtime.InteropServices.DllImport("USER32.dll")]   internal static extern IntPtr GetDC(IntPtr dc);   [System.Runtime.InteropServices.DllImport("USER32.dll")]   internal static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);   [System.Runtime.InteropServices.DllImport("USER32.dll")]   internal static extern IntPtr GetDesktopWindow();   [System.Runtime.InteropServices.DllImport("gdi32.dll")]   internal static extern bool BitBlt(IntPtr hdcDest, int nXDest, int nYDest, int nWidth, int nHeight, IntPtr hdcSrc, int nXSrc, int nYSrc, uint dwRop);   [System.Runtime.InteropServices.DllImport("gdi32.dll")]   internal static extern IntPtr CreateCompatibleDC(IntPtr hdc);   [System.Runtime.InteropServices.DllImport("gdi32.dll")]   internal static extern IntPtr CreateCompatibleBitmap(IntPtr hdc, int nWidth, int nHeight);   [System.Runtime.InteropServices.DllImport("gdi32.dll")]   internal static extern bool DeleteObject(IntPtr hObject);   [System.Runtime.InteropServices.DllImport("gdi32.dll")]   internal static extern IntPtr SelectObject(IntPtr hdc, IntPtr obj);   [System.Runtime.InteropServices.DllImport("gdi32.dll")]   internal static extern IntPtr CreateSolidBrush(int color);   [System.Runtime.InteropServices.DllImport("gdi32.dll")]   internal static extern IntPtr CreatePatternBrush(IntPtr hBitmap);   /// <summary>   /// 获取控件的截图   /// </summary>   /// <param name="control">控件</param>   /// <param name="pattern">图片</param>   /// <returns></returns>   public static Bitmap GetControlBitmap(Control control, Bitmap pattern)   {    int width = control.Width;    int height = control.Height;    if (control is Form)    {     width = control.ClientRectangle.Width;     height = control.ClientRectangle.Height;    }    IntPtr hdc = GetDC(control.Handle);    IntPtr compDC = CreateCompatibleDC(hdc);    IntPtr compHBmp = CreateCompatibleBitmap(hdc, width, height);    IntPtr prev = SelectObject(compDC, compHBmp);    IntPtr brush = IntPtr.Zero, prevBrush = IntPtr.Zero;    if (pattern != null)    {     brush = CreatePatternBrush(pattern.GetHbitmap());     prevBrush = SelectObject(compDC, brush);    }    Point pt = new Point(0, 0);    BitBlt(compDC, 0, 0, width, height, hdc, pt.X, pt.Y, 0x00C000CA);    SelectObject(compDC, prev);    if (prevBrush != IntPtr.Zero)     SelectObject(compDC, prevBrush);    ReleaseDC(control.Handle, hdc);    NativeMethods.DeleteDC(compDC);    Bitmap bmp = Bitmap.FromHbitmap(compHBmp);    DeleteObject(compHBmp);    if (brush != IntPtr.Zero)     DeleteObject(brush);    return bmp;   }   /// <summary>   /// 获取控件的截图   /// </summary>   /// <param name="control">控件</param>   /// <param name="pattern">图片</param>   /// <param name="offSetX">X</param>   /// <param name="offSetY">Y</param>   /// <param name="width">宽</param>   /// <param name="height">高</param>   /// <returns></returns>   public static Bitmap GetControlBitmap(Control control, Bitmap pattern, int offSetX = 0, int offSetY = 0, int width = 0, int height = 0)   {    width = width == 0 ? control.Width : width;    height = height == 0 ? control.Height : height;    if (control is Form)    {     width = control.ClientRectangle.Width;     height = control.ClientRectangle.Height;    }    IntPtr hdc = GetDC(control.Handle);    IntPtr compDC = CreateCompatibleDC(hdc);    IntPtr compHBmp = CreateCompatibleBitmap(hdc, width, height);    IntPtr prev = SelectObject(compDC, compHBmp);    IntPtr brush = IntPtr.Zero, prevBrush = IntPtr.Zero;    if (pattern != null)    {     brush = CreatePatternBrush(pattern.GetHbitmap());     prevBrush = SelectObject(compDC, brush);    }    Point pt = new Point(offSetX, offSetY);    BitBlt(compDC, 0, 0, width, height, hdc, pt.X, pt.Y, 0x00C000CA);    SelectObject(compDC, prev);    if (prevBrush != IntPtr.Zero)     SelectObject(compDC, prevBrush);    ReleaseDC(control.Handle, hdc);    NativeMethods.DeleteDC(compDC);    Bitmap bmp = Bitmap.FromHbitmap(compHBmp);    DeleteObject(compHBmp);    if (brush != IntPtr.Zero)     DeleteObject(brush);    return bmp;   } }  public class DragMaster  {   [ThreadStatic]   static DragWindow dragWindow;   bool dragInProgress;   DragDropEffects effects;   DragDropEffects lastEffect;   static Cursor customizationCursor = null;   double _opacity = 0.7;     public double Opacity   {    get { return _opacity; }    set { _opacity = value; }   }   public DragMaster()   {    dragInProgress = false;    lastEffect = effects = DragDropEffects.None;   }     DragWindow DragWindow   {    get    {     if (dragWindow == null) dragWindow = new DragWindow() { Opacity = this.Opacity };     return dragWindow;    }   }   public DragDropEffects LastEffect   {    get { return lastEffect; }   }   public bool DragInProgress   {    get { return dragInProgress; }   }     /// <summary>   /// 绘制大小   /// </summary>   public Size DragSize   {    get    {     if (DragWindow.DragBitmap == null) return Size.Empty;     return DragWindow.DragBitmap.Size;    }   }   /// <summary>   /// 开始拖拽   /// </summary>   /// <param name="bmp"></param>   /// <param name="startPoint"></param>   /// <param name="effects"></param>   public void StartDrag(Bitmap bmp, Point startPoint, DragDropEffects effects)   {    StopDrag();    dragInProgress = true;    this.effects = effects;    lastEffect = effects;    DragWindow.MakeTopMost();    DragWindow.DragBitmap = bmp;    DragWindow.ShowDrag(startPoint);    SetDragCursor(effects);   }   /// <summary>   /// 停止拖拽   /// </summary>   protected void StopDrag()   {    dragInProgress = false;    lastEffect = effects = DragDropEffects.None;    DragWindow.HideDrag();   }   /// <summary>   /// 设置拖拽鼠标类型   /// </summary>   /// <param name="e"></param>   public void SetDragCursor(DragDropEffects e)   {    if (e == DragDropEffects.None)     Cursor.Current = CustomizationCursor;    else     Cursor.Current = Cursors.Default;   }   /// <summary>   /// 拖拽   /// </summary>   /// <param name="p"></param>   /// <param name="e"></param>   /// <param name="setCursor"></param>   public void DoDrag(Point p, DragDropEffects e, bool setCursor)   {    if (!dragInProgress) return;    lastEffect = e;    if (setCursor) SetDragCursor(e);    DragWindow.MoveDrag(p);   }   /// <summary>   /// 取消拖拽   /// </summary>   public void CancelDrag()   {    if (!dragInProgress) return;    StopDrag();   }   /// <summary>   /// 结束拖拽   /// </summary>   public void EndDrag()   {    if (!dragInProgress) return;    StopDrag();   }   /// <summary>   /// 自定义Cursor   /// </summary>   static Cursor CustomizationCursor   {    get    {     if (customizationCursor == null) customizationCursor = ResourceImageHelper.CreateCursorFromResources("DevExpress.XtraTreeList.Images.customization.cur", typeof(DragMaster).Assembly);     return customizationCursor;    }   } }