C# Html.CssBox类代码示例

        /// <summary>
        /// Static constructor and initialization
        /// </summary>
        static CssBox()
        {
            #region Initialize _properties, _inheritables and _defaults Dictionaries
            
            _properties = new Dictionary<string, PropertyInfo>();
            _defaults = new Dictionary<string, string>();
            _inheritables = new List<PropertyInfo>();
            _cssproperties = new List<PropertyInfo>();

            PropertyInfo[] props = typeof(CssBox).GetProperties();
            for (int i = 0; i < props.Length; i++)
            {
                CssPropertyAttribute att = Attribute.GetCustomAttribute(props[i], typeof(CssPropertyAttribute)) as CssPropertyAttribute;

                if (att != null)
                {
                    _properties.Add(att.Name, props[i]);
                    _defaults.Add(att.Name, GetDefaultValue(props[i]));
                    _cssproperties.Add(props[i]);

                    CssPropertyInheritedAttribute inh = Attribute.GetCustomAttribute(props[i], typeof(CssPropertyInheritedAttribute)) as CssPropertyInheritedAttribute;

                    if (inh != null)
                    {
                        _inheritables.Add(props[i]);
                    }
                }
            } 
            #endregion

            Empty = new CssBox();
            
        }

 /// <summary>
 /// Gets the baseline Height of the rectangle
 /// </summary>
 /// <param name="g"></param>
 /// <returns></returns>
 public float GetBaseLineHeight(CssBox b, Graphics g)
 {
     Font f = b.ActualFont;
     FontFamily ff = f.FontFamily;
     FontStyle s = f.Style;
     return f.GetHeight(g) * ff.GetCellAscent(s) / ff.GetLineSpacing(s);
 }

        /// <summary>
        /// Parses a length. Lengths are followed by an unit identifier (e.g. 10px, 3.1em)
        /// </summary>
        /// <param name="length">Specified length</param>
        /// <param name="hundredPercent">Equivalent to 100 percent when length is percentage</param>
        /// <param name="box"></param>
        /// <param name="useParentsEm"></param>
        /// <param name="returnPoints">Allows the return float to be in points. If false, result will be pixels</param>
        /// <returns></returns>
        public static float ParseLength(string length, float hundredPercent, CssBox box, float emFactor, bool returnPoints)
        {
            //Return zero if no length specified, zero specified
            if (string.IsNullOrEmpty(length) || length == "0") return 0f;

            //If percentage, use ParseNumber
            if (length.EndsWith("%")) return ParseNumber(length, hundredPercent);

            //If no units, return zero
            if (length.Length < 3) return 0f;

            //Get units of the length
            string unit = length.Substring(length.Length - 2, 2);

            //Factor will depend on the unit
            float factor = 1f;

            //Number of the length
            string number = length.Substring(0, length.Length - 2);

            //TODO: Units behave different in paper and in screen!
            switch (unit)
            {
                case CssConstants.Em:
                    factor = emFactor;
                    break;
                case CssConstants.Px:
                    factor = 1f;
                    break;
                case CssConstants.Mm:
                    factor = 3f; //3 pixels per millimeter
                    break;
                case CssConstants.Cm:
                    factor = 37f; //37 pixels per centimeter
                    break;
                case CssConstants.In:
                    factor = 96f; //96 pixels per inch
                    break;
                case CssConstants.Pt:
                    factor = 96f / 72f; // 1 point = 1/72 of inch

                    if (returnPoints)
                    {
                        return ParseNumber(number, hundredPercent);
                    }

                    break;
                case CssConstants.Pc:
                    factor = 96f / 72f * 12f; // 1 pica = 12 points
                    break;
                default:
                    factor = 0f;
                    break;
            }

            

            return factor * ParseNumber(number, hundredPercent);
        }

 /// <summary>
 /// Creates a new LineBox
 /// </summary>
 public CssLineBox(CssBox ownerBox)
 {
     _rects = new Dictionary<CssBox, RectangleF>();
     _relatedBoxes = new List<CssBox>();
     _words = new List<CssBoxWord>();
     _ownerBox = ownerBox;
     _ownerBox.LineBoxes.Add(this);
 }

        public CssAnonymousBlockBox(CssBox parent, CssBox insertBefore)
            : this(parent)
        {
            int index = parent.Boxes.IndexOf(insertBefore);

            if (index < 0)
            {
                throw new Exception("insertBefore box doesn't exist on parent");
            }
            parent.Boxes.Remove(this);
            parent.Boxes.Insert(index, this);
        }

        public CssTable(CssBox tableBox, Graphics g)
            : this()
        {
            if (!(tableBox.Display == CssConstants.Table || tableBox.Display == CssConstants.InlineTable))
                throw new ArgumentException("Box is not a table", "tableBox");

            _tableBox = tableBox;

            MeasureWords(tableBox, g);

            Analyze(g);
        }

        /// <summary>
        /// Applies special vertical alignment for table-cells
        /// </summary>
        /// <param name="g"></param>
        /// <param name="cell"></param>
        public static void ApplyCellVerticalAlignment(Graphics g, CssBox cell)
        {
            if (cell.VerticalAlign == CssConstants.Top || cell.VerticalAlign == CssConstants.Baseline) return;

            float celltop = cell.ClientTop;
            float cellbot = cell.ClientBottom;
            float bottom = cell.GetMaximumBottom(cell, 0f);
            float dist = 0f;

            if (cell.VerticalAlign == CssConstants.Bottom)
            {
                dist = cellbot - bottom;
            }
            else if (cell.VerticalAlign == CssConstants.Middle)
            {
                dist = (cellbot - bottom) / 2;
            }

            foreach (CssBox b in cell.Boxes)
            {
                b.OffsetTop(dist);
            }

            //float top = cell.ClientTop;
            //float bottom = cell.ClientBottom;
            //bool middle = cell.VerticalAlign == CssConstants.Middle;

            //foreach (LineBox line in cell.LineBoxes)
            //{
            //    for (int i = 0; i < line.RelatedBoxes.Count; i++)
            //    {

            //        float diff = bottom - line.RelatedBoxes[i].Rectangles[line].Bottom;
            //        if (middle) diff /= 2f;
            //        RectangleF r = line.RelatedBoxes[i].Rectangles[line];
            //        line.RelatedBoxes[i].Rectangles[line] = new RectangleF(r.X, r.Y + diff, r.Width, r.Height);

            //    }

            //    foreach (BoxWord word in line.Words)
            //    {
            //        float gap = word.Top - top;
            //        word.Top = bottom - gap - word.Height;
            //    }
            //}
        }

        /// <summary>
        /// Parses a border value in CSS style; e.g. 1px, 1, thin, thick, medium
        /// </summary>
        /// <param name="borderValue"></param>
        /// <returns></returns>
        public static float GetActualBorderWidth(string borderValue, CssBox b)
        {
            if (string.IsNullOrEmpty(borderValue))
            {
                return GetActualBorderWidth(CssConstants.Medium, b);
            }

            switch (borderValue)
            {
                case CssConstants.Thin:
                    return 1f;
                case CssConstants.Medium:
                    return 2f;
                case CssConstants.Thick:
                    return 4f;
                default:
                    return Math.Abs(ParseLength(borderValue, 1, b));
            }
        }

        /// <summary>
        /// Creates line boxes for the specified blockbox
        /// </summary>
        /// <param name="g"></param>
        /// <param name="blockBox"></param>
        public static void CreateLineBoxes(Graphics g, CssBox blockBox)
        {
            blockBox.LineBoxes.Clear();

            float maxRight = blockBox.ActualRight - blockBox.ActualPaddingRight - blockBox.ActualBorderRightWidth;

            //Get the start x and y of the blockBox
            float startx = blockBox.Location.X + blockBox.ActualPaddingLeft - 0 + blockBox.ActualBorderLeftWidth; //TODO: Check for floats
            float starty = blockBox.Location.Y + blockBox.ActualPaddingTop - 0 + blockBox.ActualBorderTopWidth;
            float curx = startx + blockBox.ActualTextIndent;
            float cury = starty;

            //Reminds the maximum bottom reached
            float maxBottom = starty;

            //Extra amount of spacing that should be applied to lines when breaking them.
            float lineSpacing = 0f;

            //First line box
            CssLineBox line = new CssLineBox(blockBox);

            //Flow words and boxes
            FlowBox(g, blockBox, blockBox, maxRight, lineSpacing, startx,ref line, ref curx, ref cury, ref maxBottom);

            //Gets the rectangles foreach linebox
            foreach (CssLineBox linebox in blockBox.LineBoxes)
            {

                BubbleRectangles(blockBox, linebox);
                linebox.AssignRectanglesToBoxes();
                ApplyAlignment(g, linebox);
                if (blockBox.Direction == CssConstants.Rtl) ApplyRightToLeft(linebox);

                //linebox.DrawRectangles(g);
            }

            blockBox.ActualBottom = maxBottom + blockBox.ActualPaddingBottom + blockBox.ActualBorderBottomWidth;
        }

        /// <summary>
        /// Bubbles up the padding from the starting box
        /// </summary>
        /// <param name="box"></param>
        /// <returns></returns>
        private void GetMinimumWidth_BubblePadding(CssBox box, CssBox endbox, ref float sum)
        {
            //float padding = box.ActualMarginLeft + box.ActualBorderLeftWidth + box.ActualPaddingLeft +
            //    box.ActualMarginRight + box.ActualBorderRightWidth + box.ActualPaddingRight;

            float padding =  box.ActualBorderLeftWidth + box.ActualPaddingLeft +
                 box.ActualBorderRightWidth + box.ActualPaddingRight;

            sum += padding;

            if (!box.Equals(endbox))
            {
                GetMinimumWidth_BubblePadding(box.ParentBox, endbox, ref sum);
            }
        }

        /// <summary>
        /// Gets the longest word (in width) inside the box, deeply.
        /// </summary>
        /// <param name="b"></param>
        /// <returns></returns>
        private void GetMinimumWidth_LongestWord(CssBox b, ref float maxw, ref CssBoxWord word)
        {

            if (b.Words.Count > 0)
            {
                foreach (CssBoxWord w in b.Words)
                {
                    if (w.FullWidth > maxw)
                    {
                        maxw = w.FullWidth;
                        word = w;
                    }
                }
            }
            else
            {
                foreach(CssBox bb in b.Boxes)
                    GetMinimumWidth_LongestWord(bb, ref maxw,ref word);
            }

        }

        /// <summary>
        /// Gets the previous sibling of this box.
        /// </summary>
        /// <returns>Box before this one on the tree. Null if its the first</returns>
        private CssBox GetPreviousSibling(CssBox b)
        {
            if (b.ParentBox == null)
            {
                return null; //This is initial containing block
            }

            int index = b.ParentBox.Boxes.IndexOf(this);

            if (index < 0) throw new Exception("Box doesn't exist on parent's Box list");

            if (index == 0) return null; //This is the first sibling.


            int diff = 1;
            CssBox sib = b.ParentBox.Boxes[index - diff];

            while ((sib.Display == CssConstants.None || sib.Position == CssConstants.Absolute) && index - diff - 1 >= 0)
            {
                sib = b.ParentBox.Boxes[index - ++diff];
            }

            return sib.Display == CssConstants.None ? null : sib;
        }

        /// <summary>
        /// Searches for the first word occourence inside the box, on the specified linebox
        /// </summary>
        /// <param name="b"></param>
        /// <returns></returns>
        internal CssBoxWord FirstWordOccourence(CssBox b, CssLineBox line)
        {
            if (b.Words.Count == 0 && b.Boxes.Count == 0)
            {
                return null;
            }

            if (b.Words.Count > 0)
            {   
                foreach (CssBoxWord word in b.Words)
                {
                    if (line.Words.Contains(word))
                    {
                        return word;
                    }
                }
                return null;
            }
            else
            {
                foreach (CssBox bb in b.Boxes)
                {
                    CssBoxWord w = FirstWordOccourence(bb, line);

                    if (w != null)
                    {
                        return w;
                    }
                }

                return null;
            }
        }

 /// <summary>
 /// Cascades to the TD's the border spacified in the TABLE tag.
 /// </summary>
 /// <param name="table"></param>
 /// <param name="border"></param>
 private void ApplyTableBorder(CssBox table, string border)
 {
     foreach (CssBox box in table.Boxes)
     {
         foreach (CssBox cell in box.Boxes)
         {
             cell.BorderWidth = TranslateLength(border);
         }
     }
 }

        /// <summary>
        /// Gets the white space width of the specified box
        /// </summary>
        /// <param name="g"></param>
        /// <param name="b"></param>
        /// <returns></returns>
        public static float WhiteSpace(Graphics g, CssBox b)
        {
            string space = " .";
            float w = 0f;
            float onError = 5f;

            StringFormat sf = new StringFormat();
            sf.SetMeasurableCharacterRanges(new CharacterRange[] { new CharacterRange(0, 1) });
            Region[] regs = g.MeasureCharacterRanges(space, b.ActualFont, new RectangleF(0, 0, float.MaxValue, float.MaxValue), sf);

            if (regs == null || regs.Length == 0) return onError;

            w = regs[0].GetBounds(g).Width;

            if (!(string.IsNullOrEmpty(b.WordSpacing) || b.WordSpacing == CssConstants.Normal))
            {
                w += CssValue.ParseLength(b.WordSpacing, 0, b);
            }
            return w;
        }