C# Forms.GiveFeedbackEventArgs类代码示例

        private void treeView_GiveFeedback(object sender, GiveFeedbackEventArgs e)
        {
            // 드래그 드랍을 받는 타겟에서 드랍 가능 여부를 e.Effect로 알수 있다.

            Debug.WriteLine("\t Source Give Feedback : " + e.Effect);

            // 드랍 가능 여부 상태에 따라서 마우스 커서의 모양을 바꿔줄 수 있다.

            Cursor MyNormalCursor = null;
            Cursor MyNoDropCursor = null;
            try
            {

                MyNormalCursor = new Cursor("AllowDrop.cur");
                MyNoDropCursor = new Cursor("NoDrop.cur");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }

            // Sets the custom cursor based upon the effect.
            e.UseDefaultCursors = false;
            if ((e.Effect & DragDropEffects.All) == DragDropEffects.All)
                Cursor.Current = MyNormalCursor;
            else
                Cursor.Current = MyNoDropCursor;
        }

 private void ActionHolder_GiveFeedback(object sender, GiveFeedbackEventArgs e)
 {
     if (dragging)
     {
         this.Location = new Point(this.Location.X, dragStartY + Cursor.Position.Y - dragStartMouseY);
         Refresh();
     }
 }

 public int OleGiveFeedback(int dwEffect) {
     GiveFeedbackEventArgs gfbevent = new GiveFeedbackEventArgs((DragDropEffects) dwEffect, true);
     peer.OnGiveFeedback(gfbevent);
     if (gfbevent.UseDefaultCursors) {
         return DragDropSUseDefaultCursors;
     }
     return 0;
 }

 private void componentsListView_GiveFeedback(object sender, GiveFeedbackEventArgs e)
 {
     if (null != draggedImg)
     {
         e.UseDefaultCursors = false;
         Cursor.Current = new Cursor(new Bitmap(draggedImg, 32, 32).GetHicon());
     }
 }

 private void checkedVersesCheckedListBox_GiveFeedback(object sender, GiveFeedbackEventArgs e)
 {
     if (e.Effect == DragDropEffects.Move)
     {
         Cursor.Current = Cursors.Hand;
     }
     else
     {
         Cursor.Current = Cursors.Default;
     }
 }

 private void ListDragSource_GiveFeedback(object sender, GiveFeedbackEventArgs e)
 {
     // Use custom cursors if the check box is checked.
     if (UseCustomCursorsCheck.Checked)
     {
         // Sets the custom cursor based upon the effect.
         e.UseDefaultCursors = false;
         if ((e.Effect & DragDropEffects.Move) == DragDropEffects.Move)
             Cursor.Current = MyNormalCursor;
         else
             Cursor.Current = MyNoDropCursor;
     }
 }

        protected override bool OnGiveFeedback(GiveFeedbackEventArgs gfbevent)
        {
            base.OnGiveFeedback(gfbevent);

            if (this.draggedDesignerImages != null)
            {
                gfbevent.UseDefaultCursors = false;
                if ((gfbevent.Effect & DragDropEffects.Move) == DragDropEffects.Move)
                    Cursor.Current = FreeFormDragDropManager.DragMoveCursor;
                else if ((gfbevent.Effect & DragDropEffects.Copy) == DragDropEffects.Copy)
                    Cursor.Current = FreeFormDragDropManager.DragCopyCursor;
                else
                    Cursor.Current = Cursors.No;

                return true;
            }

            return false;
        }

		protected virtual void OnGiveFeedback (GiveFeedbackEventArgs giveFeedbackEvent)
		{
			GiveFeedbackEventHandler eh = (GiveFeedbackEventHandler)(Events[GiveFeedbackEvent]);
			if (eh != null)
				eh (this, giveFeedbackEvent);
		}

 bool IWorkflowDesignerMessageSink.OnGiveFeedback(GiveFeedbackEventArgs e)
 {
     try
     {
         OnGiveFeedback(e);
     }
     catch
     {
     }
     return true;
 }

		private void ShellTreeView_GiveFeedback(object sender, GiveFeedbackEventArgs e) {
			e.UseDefaultCursors = true;
			var doo = new System.Windows.Forms.DataObject(this._DataObject);
			if (doo.GetDataPresent("DragWindow")) {
				IntPtr hwnd = ShellView.GetIntPtrFromData(doo.GetData("DragWindow"));
				User32.PostMessage(hwnd, 0x403, IntPtr.Zero, IntPtr.Zero);
			} else {
				e.UseDefaultCursors = true;
			}

			if (ShellView.IsDropDescriptionValid(this._DataObject)) {
				e.UseDefaultCursors = false;
				Cursor.Current = Cursors.Arrow;
			} else {
				e.UseDefaultCursors = true;
			}

			if (ShellView.IsShowingLayered(doo)) {
				e.UseDefaultCursors = false;
				Cursor.Current = Cursors.Arrow;
			} else {
				e.UseDefaultCursors = true;
			}

			base.OnGiveFeedback(e);
		}

        /// <summary>
        /// 
        /// </summary>
        /// <param name="args"></param>
        protected override void OnGiveFeedback(GiveFeedbackEventArgs args)
        {
            base.OnGiveFeedback(args);

            if (this.DropSink != null)
                this.DropSink.GiveFeedback(args);
        }

		//-------------------------------------------------------------------------------------
		/// <summary>
		/// 
		/// </summary>
		/// <param name="e"></param>
		protected override void OnGiveFeedback(GiveFeedbackEventArgs e)
		{
			if(allowInternalDragDrop)
			{
				Rectangle r = treeView.RectangleToScreen(treeView.ClientRectangle); 
				if(r.Contains(Control.MousePosition))
				{
					e.UseDefaultCursors = false;
					r = new Rectangle(20,20,r.Width - 40, r.Height - 40);
					Point p = treeView.PointToClient(Control.MousePosition);
					if(p.Y < r.Y)
						WinAPI.APIWrappers.SendMessage(treeView.Handle, WinAPI.WM.VSCROLL, 0, 0);
					if(p.Y > r.Height)
						WinAPI.APIWrappers.SendMessage(treeView.Handle, WinAPI.WM.VSCROLL, 1, 0);
					if(p.X < r.X)
						WinAPI.APIWrappers.SendMessage(treeView.Handle, WinAPI.WM.HSCROLL, 0, 0);
					if(p.X > r.Width)
						WinAPI.APIWrappers.SendMessage(treeView.Handle, WinAPI.WM.HSCROLL, 1, 0);
				}
			}
			else
				base.OnGiveFeedback(e);
		}

 /// <summary>
 /// Change the cursor to reflect the current drag operation.
 /// </summary>
 /// <remarks>You only need to override this if you want non-standard cursors.
 /// The standard cursors are supplied automatically.</remarks>
 /// <param name="args"></param>
 public virtual void GiveFeedback(GiveFeedbackEventArgs args)
 {
     args.UseDefaultCursors = true;
 }

		private void GridControl_GiveFeedback(object sender, GiveFeedbackEventArgs e)
		{
			if (_downHitInfo == null) return;
			e.UseDefaultCursors = false;
			Cursor.Current = _dragRowCursor;
		}

 private void OnGiveFeedback(object sender, GiveFeedbackEventArgs e)
 {
     if (m_dragData != null)
     {
         DropDescriptionHelper.DefaultGiveFeedback(m_dragData, e);
     }
 }