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拖拽时带行截图效果实现代码
/// <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; } }