OpenHardwareMonitor-retired: External/Aga.Controls/Tree/AutoRowHeightLayout.cs@0c551e8818e0

     1 using System;

     2 using System.Collections.Generic;

     3 using System.Text;

     4 using System.Drawing;

     5 using Aga.Controls.Tree.NodeControls;

     7 namespace Aga.Controls.Tree

8 {

     9 	public class AutoRowHeightLayout: IRowLayout

    10 	{

    11 		private DrawContext _measureContext;

    12 		private TreeViewAdv _treeView;

    13 		private List<Rectangle> _rowCache;

    15 		public AutoRowHeightLayout(TreeViewAdv treeView, int rowHeight)

    16 		{

    17 			_rowCache = new List<Rectangle>();

    18 			_treeView = treeView;

    19 			PreferredRowHeight = rowHeight;

    20 			_measureContext = new DrawContext();

    21 			_measureContext.Graphics = Graphics.FromImage(new Bitmap(1, 1));

    22 		}

    24 		private int _rowHeight;

    25 		public int PreferredRowHeight

    26 		{

    27 			get { return _rowHeight; }

    28 			set { _rowHeight = value; }

    29 		}

    32 		public int PageRowCount

    33 		{

    34 			get

    35 			{

    36 				if (_treeView.RowCount == 0)

    37 					return 0;

    38 				else

    39 				{

    40 					int pageHeight = _treeView.DisplayRectangle.Height - _treeView.ColumnHeaderHeight;

    41 					int y = 0;

    42 					for (int i = _treeView.RowCount - 1; i >= 0; i--)

    43 					{

    44 						y += GetRowHeight(i);

    45 						if (y > pageHeight)

    46 							return Math.Max(0, _treeView.RowCount - 1 - i);

    47 					}

    48 					return _treeView.RowCount;

    49 				}

    50 			}

    51 		}

    53 		public int CurrentPageSize

    54 		{

    55 			get

    56 			{

    57 				if (_treeView.RowCount == 0)

    58 					return 0;

    59 				else

    60 				{

    61 					int pageHeight = _treeView.DisplayRectangle.Height - _treeView.ColumnHeaderHeight;

    62 					int y = 0;

    63 					for (int i = _treeView.FirstVisibleRow; i < _treeView.RowCount; i++)

    64 					{

    65 						y += GetRowHeight(i);

    66 						if (y > pageHeight)

    67 							return Math.Max(0, i - _treeView.FirstVisibleRow);

    68 					}

    69 					return Math.Max(0, _treeView.RowCount - _treeView.FirstVisibleRow);

    70 				}

    71 			}

    72 		}

    74 		public Rectangle GetRowBounds(int rowNo)

    75 		{

    76 			if (rowNo >= _rowCache.Count)

    77 			{

    78 				int count = _rowCache.Count;

    79 				int y = count > 0 ? _rowCache[count - 1].Bottom : 0;

    80 				for (int i = count; i <= rowNo; i++)

    81 				{

    82 					int height = GetRowHeight(i);

    83 					_rowCache.Add(new Rectangle(0, y, 0, height));

    84 					y += height;

    85 				}

    86 				if (rowNo < _rowCache.Count - 1)

    87 					return Rectangle.Empty;

    88 			}

    89 			if (rowNo >= 0 && rowNo < _rowCache.Count)

    90 				return _rowCache[rowNo];

    91 			else

    92 				return Rectangle.Empty;

    93 		}

    95 		private int GetRowHeight(int rowNo)

    96 		{

    97 			if (rowNo < _treeView.RowMap.Count)

    98 			{

    99 				TreeNodeAdv node = _treeView.RowMap[rowNo];

   100 				if (node.Height == null)

   101 				{

   102 					int res = 0;

   103 					_measureContext.Font = _treeView.Font;

   104 					foreach (NodeControl nc in _treeView.NodeControls)

   105 					{

   106 						int h = nc.GetActualSize(node, _measureContext).Height;

   107 						if (h > res)

   108 							res = h;

   109 					}

   110 					node.Height = res;

   111 				}

   112 				return node.Height.Value;

   113 			}

   114 			else

   115 				return 0;

   116 		}

   118 		public int GetRowAt(Point point)

   119 		{

   120 			int py = point.Y - _treeView.ColumnHeaderHeight;

   121 			int y = 0;

   122 			for (int i = _treeView.FirstVisibleRow; i < _treeView.RowCount; i++)

   123 			{

   124 				int h = GetRowHeight(i);

   125 				if (py >= y && py < y + h)

   126 					return i;

   127 				else

   128 					y += h;

   129 			}

   130 			return -1;

   131 		}

   133 		public int GetFirstRow(int lastPageRow)

   134 		{

   135 			int pageHeight = _treeView.DisplayRectangle.Height - _treeView.ColumnHeaderHeight;

   136 			int y = 0;

   137 			for (int i = lastPageRow; i >= 0; i--)

   138 			{

   139 				y += GetRowHeight(i);

   140 				if (y > pageHeight)

   141 					return Math.Max(0, i + 1);

   142 			}

   143 			return 0;

   144 		}

   146 		public void ClearCache()

   147 		{

   148 			_rowCache.Clear();

   149 		}

   150 	}

   151 }

author	moel.mich
	Sun, 27 May 2012 15:16:19 +0000
changeset 345	0c551e8818e0
permissions	-rw-r--r--