C# Position.IsEmpty方法代碼示例

		/// <summary>
		/// This method converts a Position to the real range of the cell. This is usefull when RowSpan or ColumnSpan is greater than 1.
		/// For example suppose to have at grid[0,0] a cell with ColumnSpan equal to 2. If you call this method with the position 0,0 returns 0,0-0,1 and if you call this method with 0,1 return again 0,0-0,1.
		/// </summary>
		/// <param name="pPosition"></param>
		/// <returns></returns>
		public virtual Range PositionToCellRange(Position pPosition)
		{
			if (pPosition.IsEmpty())
				return Range.Empty;

			ICellVirtual l_Cell = this.GetCell(pPosition.Row, pPosition.Column);
			if (l_Cell == null)
				return Range.Empty;
			else
				return new Range(pPosition);
			//return new Range(pPosition);
		}

		/// <summary>
		/// This method converts a Position to the real range of the cell. This is usefull when RowSpan or ColumnSpan is greater than 1.
		/// For example suppose to have at grid[0,0] a cell with ColumnSpan equal to 2. If you call this method with the position 0,0 returns 0,0-0,1 and if you call this method with 0,1 return again 0,0-0,1.
		/// </summary>
		/// <param name="pPosition"></param>
		/// <returns></returns>
		public override Range PositionToCellRange(Position pPosition)
		{
			if (pPosition.IsEmpty())
				return Range.Empty;

			Cells.ICell l_Cell = this[pPosition.Row, pPosition.Column];
			if (l_Cell == null)
				return Range.Empty;
			else
				return l_Cell.Range;
		}

		/// <summary>
		/// Return the Cell at the specified Row and Col position. This method is called for sort operations and for Move operations. If position is Empty return null. This method calls GetCell(int p_iRow, int p_iCol)
		/// </summary>
		/// <param name="p_Position"></param>
		/// <returns></returns>
		public Cells.ICellVirtual GetCell(Position p_Position)
		{
			if (p_Position.IsEmpty())
				return null;
			else
				return GetCell(p_Position.Row, p_Position.Column);
		}

		/// <summary>
		/// Returns the type of a cell position
		/// </summary>
		/// <param name="position"></param>
		/// <returns></returns>
		public CellPositionType GetPositionType(Position position)
		{
			if (position.IsEmpty())
				return CellPositionType.Empty;
			else if (position.Row < FixedRows && position.Column < FixedColumns)
				return CellPositionType.FixedTopLeft;
			else if (position.Row < FixedRows)
				return CellPositionType.FixedTop;
			else if (position.Column < FixedColumns)
				return CellPositionType.FixedLeft;
			else
				return CellPositionType.Scrollable;
		}

		protected override void OnKeyDown(KeyEventArgs e)
		{
			base.OnKeyDown(e);
			m_keybordActivePosition = Selection.ActivePosition;

			if (m_keybordActivePosition.IsEmpty() == false)
			{
				Cells.ICellVirtual focusCell = GetCell(m_keybordActivePosition);
				if (focusCell != null)
					Controller.OnKeyDown(new CellContext(this, m_keybordActivePosition, focusCell), e);
			}

			if (e.Handled == false)
				ProcessSpecialGridKey(e);
		}

		private void HandleMouseDoubleClick(Position clickPosition, EventArgs e)
		{
			if (clickPosition.IsEmpty() == true)
				return;
			Cells.ICellVirtual mouseDownCell = GetCell(clickPosition);
			if (mouseDownCell != null)
				Controller.OnDoubleClick(new CellContext(this, clickPosition, mouseDownCell), e);
		}

		/// <summary>
		/// Fired when the cell under the mouse change. For internal use only.
		/// </summary>
		/// <param name="p_Cell"></param>
		public virtual void ChangeMouseCell(Position p_Cell)
		{
			if (m_MouseCellPosition != p_Cell)
			{
				//se la cella che sta perdento il mouse è anche quella che ha ricevuto un eventuale evento di MouseDown non scateno il MouseLeave (che invece verrà scatenato dopo il MouseUp)
				if (m_MouseCellPosition.IsEmpty() == false &&
				    m_MouseCellPosition != m_MouseDownPosition)
				{
					Controller.OnMouseLeave(new CellContext(this, m_MouseCellPosition), EventArgs.Empty);
				}

				m_MouseCellPosition = p_Cell;
				if (m_MouseCellPosition.IsEmpty() == false)
				{
					Controller.OnMouseEnter(new CellContext(this, m_MouseCellPosition), EventArgs.Empty);
				}
			}
		}

        /// <summary>
        /// Calculate the destination range for the drop or paste operations.
        /// </summary>
        /// <param name="destinationGrid"></param>
        /// <param name="dropDestination"></param>
        /// <returns></returns>
        public Range FindDestinationRange(GridVirtual destinationGrid, Position dropDestination)
        {
            if (dropDestination.IsEmpty())
                return Range.Empty;

            Position destinationStart = new Position(dropDestination.Row + (mSourceRange.Start.Row - mStartDragPosition.Row),
                dropDestination.Column + (mSourceRange.Start.Column - mStartDragPosition.Column) );

            destinationStart = Position.Max(destinationStart, new Position(0, 0));

            Range destination = mSourceRange;
            destination.MoveTo( destinationStart );

            destination = destination.Intersect(destinationGrid.CompleteRange);

            return destination;
        }

        /// <summary>
        /// Indicates if the specified cell is selected
        /// </summary>
        /// <param name="p_Cell"></param>
        /// <returns></returns>
        public virtual bool Contains(Position p_Cell)
        {
            if (p_Cell.IsEmpty() || IsEmpty())
                return false;

            //Range
            for (int i = 0; i < m_RangeCollection.Count; i++)
            {
                if (m_RangeCollection[i].Contains(p_Cell))
                    return true;
            }

            return false;
        }