/// <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);
}
}
internal CssBox(CssBox parentBox, HtmlTag tag)
: this(parentBox)
{
_htmltag = tag;
}
/// <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;
}
public CssBox(CssBox parentBox)
: this()
{
ParentBox = parentBox;
}
/// <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>
/// 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>
/// <returns></returns>
public static float ParseLength(string length, float hundredPercent, CssBox box)
{
return ParseLength(length, hundredPercent, box, box.GetEmHeight(), false);
}
/// <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;
}
/// <summary>
/// Inherits inheritable values from specified box.
/// </summary>
/// <param name="everything">Set to true to inherit all CSS properties instead of only the ineritables</param>
/// <param name="godfather">Box to inherit the properties</param>
internal void InheritStyle(CssBox godfather, bool everything)
{
if (godfather != null)
{
IEnumerable<PropertyInfo> pps = everything ? _cssproperties : _inheritables;
foreach (PropertyInfo prop in pps)
{
prop.SetValue(this,
prop.GetValue(godfather, null),
null);
}
}
}
/// <summary>
/// Gets the maximum bottom of the boxes inside the startBox
/// </summary>
/// <param name="startBox"></param>
/// <param name="currentMaxBottom"></param>
/// <returns></returns>
internal float GetMaximumBottom(CssBox startBox, float currentMaxBottom)
{
foreach (CssLineBox line in startBox.Rectangles.Keys)
{
currentMaxBottom = Math.Max(currentMaxBottom, startBox.Rectangles[line].Bottom);
}
foreach (CssBox b in startBox.Boxes)
{
currentMaxBottom = Math.Max(currentMaxBottom, b.ActualBottom);
currentMaxBottom = Math.Max(currentMaxBottom, GetMaximumBottom(b, currentMaxBottom));
}
return currentMaxBottom;
}
/// <summary>
/// Recursively flows the content of the box using the inline model
/// </summary>
/// <param name="g">Device Info</param>
/// <param name="blockbox">Blockbox that contains the text flow</param>
/// <param name="box">Current box to flow its content</param>
/// <param name="maxright">Maximum reached right</param>
/// <param name="linespacing">Space to use between rows of text</param>
/// <param name="startx">x starting coordinate for when breaking lines of text</param>
/// <param name="line">Current linebox being used</param>
/// <param name="curx">Current x coordinate that will be the left of the next word</param>
/// <param name="cury">Current y coordinate that will be the top of the next word</param>
/// <param name="maxbottom">Maximum bottom reached so far</param>
private static void FlowBox(Graphics g, CssBox blockbox, CssBox box, float maxright, float linespacing, float startx,ref CssLineBox line, ref float curx, ref float cury, ref float maxbottom)
{
box.FirstHostingLineBox = line;
foreach (CssBox b in box.Boxes)
{
float leftspacing = b.ActualMarginLeft + b.ActualBorderLeftWidth + b.ActualPaddingLeft;
float rightspacing = b.ActualMarginRight + b.ActualBorderRightWidth + b.ActualPaddingRight;
float topspacing = b.ActualBorderTopWidth + b.ActualPaddingTop;
float bottomspacing = b.ActualBorderBottomWidth + b.ActualPaddingTop;
b.RectanglesReset();
b.MeasureWordsSize(g);
curx += leftspacing;
if (b.Words.Count > 0)
{
#region Flow words
foreach (CssBoxWord word in b.Words)
{
//curx += word.SpacesBeforeWidth;
if ((b.WhiteSpace != CssConstants.Nowrap && curx + word.Width + rightspacing > maxright) ||
word.IsLineBreak)
{
#region Break line
curx = startx;
cury = maxbottom + linespacing;
line = new CssLineBox(blockbox);
if (word.IsImage || word.Equals(b.FirstWord))
{
curx += leftspacing;
}
#endregion
}
line.ReportExistanceOf(word);
word.Left = curx;// -word.LastMeasureOffset.X + 1;
word.Top = cury;// - word.LastMeasureOffset.Y;
curx = word.Right;// +word.SpacesAfterWidth;
maxbottom = Math.Max(maxbottom, word.Bottom );//+ (word.IsImage ? topspacing + bottomspacing : 0));
_lastTreatedWord = word;
}
#endregion
}
else
{
FlowBox(g, blockbox, b, maxright, linespacing, startx,ref line, ref curx, ref cury, ref maxbottom);
}
curx += rightspacing;
}
box.LastHostingLineBox = line;
}
/// <summary>
/// Recursively creates the rectangles of the blockBox, by bubbling from deep to outside of the boxes
/// in the rectangle structure
/// </summary>
private static void BubbleRectangles(CssBox box, CssLineBox line)
{
if (box.Words.Count > 0)
{
float x = float.MaxValue, y = float.MaxValue, r = float.MinValue, b = float.MinValue;
List<CssBoxWord> words = line.WordsOf(box);
if (words.Count > 0)
{
foreach (CssBoxWord word in words)
{
x = Math.Min(x, word.Left);// - word.SpacesBeforeWidth);
r = Math.Max(r, word.Right);// + word.SpacesAfterWidth);
y = Math.Min(y, word.Top);
b = Math.Max(b, word.Bottom);
}
line.UpdateRectangle(box, x, y, r, b);
}
}
else
{
foreach (CssBox b in box.Boxes)
{
BubbleRectangles(b, line);
}
}
}
/// <summary>
/// Gets the longest word (in width) inside the box, deeply.
/// </summary>
/// <param name="b"></param>
/// <returns></returns>
private void GetFullWidth_WordsWith(CssBox b, Graphics g, ref float sum, ref float paddingsum)
{
if (b.Display != CssConstants.Inline)
{
sum = 0;
}
paddingsum += b.ActualBorderLeftWidth + b.ActualBorderRightWidth + b.ActualPaddingRight + b.ActualPaddingLeft;
if (b.Words.Count > 0)
{
foreach (CssBoxWord word in b.Words)
sum += word.FullWidth;
}
else
{
foreach (CssBox bb in b.Boxes)
{
GetFullWidth_WordsWith(bb, g, ref sum, ref paddingsum);
}
}
}
public CssAnonymousSpaceBox(CssBox parentBox)
: base(parentBox)
{
}
/// <summary>
/// Gets the result of collapsing the vertical margins of the two boxes
/// </summary>
/// <param name="a">Superior box (checks for margin-bottom)</param>
/// <param name="b">Inferior box (checks for margin-top)</param>
/// <returns>Maximum of margins</returns>
private float MarginCollapse(CssBox a, CssBox b)
{
return Math.Max(
a == null ? 0 : a.ActualMarginBottom,
b == null ? 0 : b.ActualMarginTop);
}
/// <summary>
/// Creates a new BoxWord which represents an image
/// </summary>
/// <param name="owner"></param>
/// <param name="image"></param>
public CssBoxWord(CssBox owner, Image image)
: this(owner)
{
Image = image;
}
internal void TranslateAttributes(CssBox box)
{
string t = TagName.ToUpper();
foreach (string att in Attributes.Keys)
{
string value = Attributes[att];
switch (att)
{
case HtmlConstants.align:
if (value == HtmlConstants.left || value == HtmlConstants.center || value == HtmlConstants.right || value == HtmlConstants.justify)
box.TextAlign = value;
else
box.VerticalAlign = value;
break;
case HtmlConstants.background:
box.BackgroundImage = value;
break;
case HtmlConstants.bgcolor:
box.BackgroundColor = value;
break;
case HtmlConstants.border:
box.BorderWidth = TranslateLength(value);
if (t == HtmlConstants.TABLE)
{
ApplyTableBorder(box, value);
}
else
{
box.BorderStyle = CssConstants.Solid;
}
break;
case HtmlConstants.bordercolor:
box.BorderColor = value;
break;
case HtmlConstants.cellspacing:
box.BorderSpacing = TranslateLength(value);
break;
case HtmlConstants.cellpadding:
ApplyTablePadding(box, value);
break;
case HtmlConstants.color:
box.Color = value;
break;
case HtmlConstants.dir:
box.Direction = value;
break;
case HtmlConstants.face:
box.FontFamily = value;
break;
case HtmlConstants.height:
box.Height = TranslateLength(value);
break;
case HtmlConstants.hspace:
box.MarginRight = box.MarginLeft = TranslateLength(value);
break;
case HtmlConstants.nowrap:
box.WhiteSpace = CssConstants.Nowrap;
break;
case HtmlConstants.size:
if (t == HtmlConstants.HR)
box.Height = TranslateLength(value);
break;
case HtmlConstants.valign:
box.VerticalAlign = value;
break;
case HtmlConstants.vspace:
box.MarginTop = box.MarginBottom = TranslateLength(value);
break;
case HtmlConstants.width:
box.Width = TranslateLength(value);
break;
}
}
}
internal CssBoxWord(CssBox owner)
{
_ownerBox = owner;
_word = string.Empty;
}
/// <summary>
/// Cascades to the TD's the border spacified in the TABLE tag.
/// </summary>
/// <param name="table"></param>
/// <param name="border"></param>
private void ApplyTablePadding(CssBox table, string padding)
{
foreach (CssBox box in table.Boxes)
{
foreach (CssBox cell in box.Boxes)
{
cell.Padding = TranslateLength(padding);
}
}
}
/// <summary>
/// Creates the <see cref="ListItemBox"/>
/// </summary>
/// <param name="g"></param>
private void CreateListItemBox(Graphics g)
{
if (Display == CssConstants.ListItem)
{
if (_listItemBox == null)
{
_listItemBox = new CssBox();
_listItemBox.InheritStyle(this, false);
_listItemBox.Display = CssConstants.Inline;
_listItemBox.SetInitialContainer(InitialContainer);
if (ParentBox != null && ListStyleType == CssConstants.Decimal)
{
_listItemBox.Text = GetIndexForList().ToString() + ".";
}
else
{
_listItemBox.Text = "•";
}
_listItemBox.MeasureBounds(g);
_listItemBox.Size = new SizeF(_listItemBox.Words[0].Width, _listItemBox.Words[0].Height);
}
_listItemBox.Words[0].Left = Location.X - _listItemBox.Size.Width - 5;
_listItemBox.Words[0].Top = Location.Y + ActualPaddingTop;// +FontAscent;
}
}