本文实例讲述了C#实现Dev Grid拖拽移动行的方法。分享给大家供大家参考。具体如下：
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拖拽时带行截图效果
实现代码如下：
/// <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; } } }
希望本文所述对大家的C#程序设计有所帮助。
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