/// <summary>
/// Get the table cells spacing for all the cells in the table.<br/>
/// Used to calculate the spacing the table has in addition to regular padding and borders.
/// </summary>
/// <param name="tableBox">the table box to calculate the spacing for</param>
/// <returns>the calculated spacing</returns>
public static double GetTableSpacing(CssBox tableBox)
{
int count = 0;
int columns = 0;
foreach (var box in tableBox.Boxes)
{
if (box.Display == CssConstants.TableColumn)
{
columns += GetSpan(box);
}
else if (box.Display == CssConstants.TableRowGroup)
{
foreach (CssBox cr in tableBox.Boxes)
{
count++;
if (cr.Display == CssConstants.TableRow)
columns = Math.Max(columns, cr.Boxes.Count);
}
}
else if (box.Display == CssConstants.TableRow)
{
count++;
columns = Math.Max(columns, box.Boxes.Count);
}
// limit the amount of rows to process for performance
if (count > 30)
break;
}
// +1 columns because padding is between the cell and table borders
return (columns + 1) * GetHorizontalSpacing(tableBox);
}
/// <summary>
/// Clip the region the graphics will draw on by the overflow style of the containing block.<br/>
/// Recursively travel up the tree to find containing block that has overflow style set to hidden. if not
/// block found there will be no clipping and null will be returned.
/// </summary>
/// <param name="g">the graphics to clip</param>
/// <param name="box">the box that is rendered to get containing blocks</param>
/// <returns>true - was clipped, false - not clipped</returns>
public static bool ClipGraphicsByOverflow(RGraphics g, CssBox box)
{
var containingBlock = box.ContainingBlock;
while (true)
{
if (containingBlock.Overflow == CssConstants.Hidden)
{
var prevClip = g.GetClip();
var rect = box.ContainingBlock.ClientRectangle;
rect.X -= 2; // TODO:a find better way to fix it
rect.Width += 2;
rect.Offset(box.HtmlContainer.ScrollOffset);
rect.Intersect(prevClip);
g.PushClip(rect);
return true;
}
else
{
var cBlock = containingBlock.ContainingBlock;
if (cBlock == containingBlock)
return false;
containingBlock = cBlock;
}
}
}
/// <summary>
/// Init.
/// </summary>
/// <param name="parent">the parent box of this box</param>
/// <param name="tag">the html tag data of this box</param>
public CssBoxFrame(CssBox parent, HtmlTag tag)
: base(parent, tag)
{
_imageWord = new CssRectImage(this);
Words.Add(_imageWord);
Uri uri;
if (Uri.TryCreate(GetAttribute("src"), UriKind.Absolute, out uri))
{
if (uri.Host.IndexOf("youtube.com", StringComparison.InvariantCultureIgnoreCase) > -1)
{
_isVideo = true;
LoadYoutubeDataAsync(uri);
}
else if (uri.Host.IndexOf("vimeo.com", StringComparison.InvariantCultureIgnoreCase) > -1)
{
_isVideo = true;
LoadVimeoDataAsync(uri);
}
}
if (!_isVideo)
{
SetErrorBorder();
}
}
/// <summary>
/// Creates a new LineBox
/// </summary>
public CssLineBox(CssBox ownerBox)
{
_rects = new Dictionary<CssBox, RRect>();
_relatedBoxes = new List<CssBox>();
_words = new List<CssRect>();
_ownerBox = ownerBox;
_ownerBox.LineBoxes.Add(this);
}
public CssSpacingBox(CssBox tableBox, ref CssBox extendedBox, int startRow)
: base(tableBox, new HtmlTag("none", false, new Dictionary<string, string> { { "colspan", "1" } }))
{
_extendedBox = extendedBox;
Display = CssConstants.None;
_startRow = startRow;
_endRow = startRow + Int32.Parse(extendedBox.GetAttribute("rowspan", "1")) - 1;
}
/// <summary>
/// Check if the given box contains only inline child boxes.
/// </summary>
/// <param name="box">the box to check</param>
/// <returns>true - only inline child boxes, false - otherwise</returns>
public static bool ContainsInlinesOnly(CssBox box)
{
foreach (CssBox b in box.Boxes)
{
if (!b.IsInline)
{
return false;
}
}
return true;
}
/// <summary>
/// Check if the given location is inside the given box deep.<br/>
/// Check inner boxes and all lines that the given box spans to.
/// </summary>
/// <param name="box">the box to check</param>
/// <param name="location">the location to check</param>
/// <returns>true - location inside the box, false - otherwise</returns>
public static bool IsInBox(CssBox box, RPoint location)
{
foreach (var line in box.Rectangles)
{
if (line.Value.Contains(location))
return true;
}
foreach (var childBox in box.Boxes)
{
if (IsInBox(childBox, location))
return true;
}
return false;
}
/// <summary>
/// Recursively searches for the parent with the specified HTML Tag name
/// </summary>
/// <param name="root"></param>
/// <param name="tagName"></param>
/// <param name="box"></param>
public static CssBox FindParent(CssBox root, string tagName, CssBox box)
{
if (box == null)
{
return root;
}
else if (box.HtmlTag != null && box.HtmlTag.Name.Equals(tagName, StringComparison.CurrentCultureIgnoreCase))
{
return box.ParentBox ?? root;
}
else
{
return FindParent(root, tagName, box.ParentBox);
}
}
/// <summary>
/// Draws all the border of the box with respect to style, width, etc.
/// </summary>
/// <param name="g">the device to draw into</param>
/// <param name="box">the box to draw borders for</param>
/// <param name="rect">the bounding rectangle to draw in</param>
/// <param name="isFirst">is it the first rectangle of the element</param>
/// <param name="isLast">is it the last rectangle of the element</param>
public static void DrawBoxBorders(RGraphics g, CssBox box, RRect rect, bool isFirst, bool isLast)
{
if (rect.Width > 0 && rect.Height > 0)
{
if (!(string.IsNullOrEmpty(box.BorderTopStyle) || box.BorderTopStyle == CssConstants.None || box.BorderTopStyle == CssConstants.Hidden) && box.ActualBorderTopWidth > 0)
{
DrawBorder(Border.Top, box, g, rect, isFirst, isLast);
}
if (isFirst && !(string.IsNullOrEmpty(box.BorderLeftStyle) || box.BorderLeftStyle == CssConstants.None || box.BorderLeftStyle == CssConstants.Hidden) && box.ActualBorderLeftWidth > 0)
{
DrawBorder(Border.Left, box, g, rect, true, isLast);
}
if (!(string.IsNullOrEmpty(box.BorderBottomStyle) || box.BorderBottomStyle == CssConstants.None || box.BorderBottomStyle == CssConstants.Hidden) && box.ActualBorderBottomWidth > 0)
{
DrawBorder(Border.Bottom, box, g, rect, isFirst, isLast);
}
if (isLast && !(string.IsNullOrEmpty(box.BorderRightStyle) || box.BorderRightStyle == CssConstants.None || box.BorderRightStyle == CssConstants.Hidden) && box.ActualBorderRightWidth > 0)
{
DrawBorder(Border.Right, box, g, rect, isFirst, true);
}
}
}
/// <summary>
/// Draw the background image of the given box in the given rectangle.<br/>
/// Handle background-repeat and background-position values.
/// </summary>
/// <param name="g">the device to draw into</param>
/// <param name="box">the box to draw its background image</param>
/// <param name="imageLoadHandler">the handler that loads image to draw</param>
/// <param name="rectangle">the rectangle to draw image in</param>
public static void DrawBackgroundImage(RGraphics g, CssBox box, ImageLoadHandler imageLoadHandler, RRect rectangle)
{
// image size depends if specific rectangle given in image loader
var imgSize = new RSize(imageLoadHandler.Rectangle == RRect.Empty ? imageLoadHandler.Image.Width : imageLoadHandler.Rectangle.Width,
imageLoadHandler.Rectangle == RRect.Empty ? imageLoadHandler.Image.Height : imageLoadHandler.Rectangle.Height);
// get the location by BackgroundPosition value
var location = GetLocation(box.BackgroundPosition, rectangle, imgSize);
var srcRect = imageLoadHandler.Rectangle == RRect.Empty
? new RRect(0, 0, imgSize.Width, imgSize.Height)
: new RRect(imageLoadHandler.Rectangle.Left, imageLoadHandler.Rectangle.Top, imgSize.Width, imgSize.Height);
// initial image destination rectangle
var destRect = new RRect(location, imgSize);
// need to clip so repeated image will be cut on rectangle
var lRectangle = rectangle;
lRectangle.Intersect(g.GetClip());
g.PushClip(lRectangle);
switch (box.BackgroundRepeat)
{
case "no-repeat":
g.DrawImage(imageLoadHandler.Image, destRect, srcRect);
break;
case "repeat-x":
DrawRepeatX(g, imageLoadHandler, rectangle, srcRect, destRect, imgSize);
break;
case "repeat-y":
DrawRepeatY(g, imageLoadHandler, rectangle, srcRect, destRect, imgSize);
break;
default:
DrawRepeat(g, imageLoadHandler, rectangle, srcRect, destRect, imgSize);
break;
}
g.PopClip();
}
/// <summary>
/// Cascades to the TD's the border spacified in the TABLE tag.
/// </summary>
/// <param name="table"></param>
/// <param name="border"></param>
private static void ApplyTableBorder(CssBox table, string border)
{
SetForAllCells(table, cell =>
{
cell.BorderLeftStyle = cell.BorderTopStyle = cell.BorderRightStyle = cell.BorderBottomStyle = CssConstants.Solid;
cell.BorderLeftWidth = cell.BorderTopWidth = cell.BorderRightWidth = cell.BorderBottomWidth = border;
});
}
/// <summary>
/// Cascades to the TD's the border spacified in the TABLE tag.
/// </summary>
/// <param name="table"></param>
/// <param name="padding"></param>
private static void ApplyTablePadding(CssBox table, string padding)
{
var length = TranslateLength(padding);
SetForAllCells(table, cell => cell.PaddingLeft = cell.PaddingTop = cell.PaddingRight = cell.PaddingBottom = length);
}
/// <summary>
///
/// </summary>
/// <param name="tag"></param>
/// <param name="box"></param>
private void TranslateAttributes(HtmlTag tag, CssBox box)
{
if (tag.HasAttributes())
{
foreach (string att in tag.Attributes.Keys)
{
string value = tag.Attributes[att];
switch (att)
{
case HtmlConstants.Align:
if (value == HtmlConstants.Left || value == HtmlConstants.Center || value == HtmlConstants.Right || value == HtmlConstants.Justify)
box.TextAlign = value.ToLower();
else
box.VerticalAlign = value.ToLower();
break;
case HtmlConstants.Background:
box.BackgroundImage = value.ToLower();
break;
case HtmlConstants.Bgcolor:
box.BackgroundColor = value.ToLower();
break;
case HtmlConstants.Border:
if (!string.IsNullOrEmpty(value) && value != "0")
box.BorderLeftStyle = box.BorderTopStyle = box.BorderRightStyle = box.BorderBottomStyle = CssConstants.Solid;
box.BorderLeftWidth = box.BorderTopWidth = box.BorderRightWidth = box.BorderBottomWidth = TranslateLength(value);
if (tag.Name == HtmlConstants.Table)
{
if (value != "0")
ApplyTableBorder(box, "1px");
}
else
{
box.BorderTopStyle = box.BorderLeftStyle = box.BorderRightStyle = box.BorderBottomStyle = CssConstants.Solid;
}
break;
case HtmlConstants.Bordercolor:
box.BorderLeftColor = box.BorderTopColor = box.BorderRightColor = box.BorderBottomColor = value.ToLower();
break;
case HtmlConstants.Cellspacing:
box.BorderSpacing = TranslateLength(value);
break;
case HtmlConstants.Cellpadding:
ApplyTablePadding(box, value);
break;
case HtmlConstants.Color:
box.Color = value.ToLower();
break;
case HtmlConstants.Dir:
box.Direction = value.ToLower();
break;
case HtmlConstants.Face:
box.FontFamily = _cssParser.ParseFontFamily(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 (tag.Name.Equals(HtmlConstants.Hr, StringComparison.OrdinalIgnoreCase))
box.Height = TranslateLength(value);
else if (tag.Name.Equals(HtmlConstants.Font, StringComparison.OrdinalIgnoreCase))
box.FontSize = value;
break;
case HtmlConstants.Valign:
box.VerticalAlign = value.ToLower();
break;
case HtmlConstants.Vspace:
box.MarginTop = box.MarginBottom = TranslateLength(value);
break;
case HtmlConstants.Width:
box.Width = TranslateLength(value);
break;
}
}
}
}
/// <summary>
/// Check if the given box contains inline and block child boxes.
/// </summary>
/// <param name="box">the box to check</param>
/// <returns>true - has variant child boxes, false - otherwise</returns>
private static bool ContainsVariantBoxes(CssBox box)
{
bool hasBlock = false;
bool hasInline = false;
for (int i = 0; i < box.Boxes.Count && (!hasBlock || !hasInline); i++)
{
var isBlock = !box.Boxes[i].IsInline;
hasBlock = hasBlock || isBlock;
hasInline = hasInline || !isBlock;
}
return hasBlock && hasInline;
}
/// <summary>
/// Makes block boxes be among only block boxes and all inline boxes have block parent box.<br/>
/// Inline boxes should live in a pool of Inline boxes only so they will define a single block.<br/>
/// At the end of this process a block box will have only block siblings and inline box will have
/// only inline siblings.
/// </summary>
/// <param name="box">the current box to correct its sub-tree</param>
private static void CorrectInlineBoxesParent(CssBox box)
{
if (ContainsVariantBoxes(box))
{
for (int i = 0; i < box.Boxes.Count; i++)
{
if (box.Boxes[i].IsInline)
{
var newbox = CssBox.CreateBlock(box, null, box.Boxes[i++]);
while (i < box.Boxes.Count && box.Boxes[i].IsInline)
{
box.Boxes[i].ParentBox = newbox;
}
}
}
}
if (!DomUtils.ContainsInlinesOnly(box))
{
foreach (var childBox in box.Boxes)
{
CorrectInlineBoxesParent(childBox);
}
}
}
/// <summary>
/// Rearrange the DOM of the box to have block box with boxes before the inner block box and after.
/// </summary>
/// <param name="box">the box that has the problem</param>
private static CssBox CorrectBlockInsideInlineImp(CssBox box)
{
if (box.Display == CssConstants.Inline)
box.Display = CssConstants.Block;
if (box.Boxes.Count > 1 || box.Boxes[0].Boxes.Count > 1)
{
var leftBlock = CssBox.CreateBlock(box);
while (ContainsInlinesOnlyDeep(box.Boxes[0]))
box.Boxes[0].ParentBox = leftBlock;
leftBlock.SetBeforeBox(box.Boxes[0]);
var splitBox = box.Boxes[1];
splitBox.ParentBox = null;
CorrectBlockSplitBadBox(box, splitBox, leftBlock);
// remove block that did not get any inner elements
if (leftBlock.Boxes.Count < 1)
leftBlock.ParentBox = null;
int minBoxes = leftBlock.ParentBox != null ? 2 : 1;
if (box.Boxes.Count > minBoxes)
{
// create temp box to handle the tail elements and then get them back so no deep hierarchy is created
var tempRightBox = CssBox.CreateBox(box, null, box.Boxes[minBoxes]);
while (box.Boxes.Count > minBoxes + 1)
box.Boxes[minBoxes + 1].ParentBox = tempRightBox;
return tempRightBox;
}
}
else if (box.Boxes[0].Display == CssConstants.Inline)
{
box.Boxes[0].Display = CssConstants.Block;
}
return null;
}
/// <summary>
/// Correct the DOM tree recursively by replacing "br" html boxes with anonymous blocks that respect br spec.<br/>
/// If the "br" tag is after inline box then the anon block will have zero height only acting as newline,
/// but if it is after block box then it will have min-height of the font size so it will create empty line.
/// </summary>
/// <param name="box">the current box to correct its sub-tree</param>
/// <param name="followingBlock">used to know if the br is following a box so it should create an empty line or not so it only
/// move to a new line</param>
private static void CorrectLineBreaksBlocks(CssBox box, ref bool followingBlock)
{
followingBlock = followingBlock || box.IsBlock;
foreach (var childBox in box.Boxes)
{
CorrectLineBreaksBlocks(childBox, ref followingBlock);
followingBlock = childBox.Words.Count == 0 && (followingBlock || childBox.IsBlock);
}
int lastBr = -1;
CssBox brBox;
do
{
brBox = null;
for (int i = 0; i < box.Boxes.Count && brBox == null; i++)
{
if (i > lastBr && box.Boxes[i].IsBrElement)
{
brBox = box.Boxes[i];
lastBr = i;
}
else if (box.Boxes[i].Words.Count > 0)
{
followingBlock = false;
}
else if (box.Boxes[i].IsBlock)
{
followingBlock = true;
}
}
if (brBox != null)
{
brBox.Display = CssConstants.Block;
if (followingBlock)
brBox.Height = ".95em"; // TODO:a check the height to min-height when it is supported
}
} while (brBox != null);
}
/// <summary>
/// Go over all the text boxes (boxes that have some text that will be rendered) and
/// remove all boxes that have only white-spaces but are not 'preformatted' so they do not effect
/// the rendered html.
/// </summary>
/// <param name="box">the current box to correct its sub-tree</param>
private static void CorrectTextBoxes(CssBox box)
{
for (int i = box.Boxes.Count - 1; i >= 0; i--)
{
var childBox = box.Boxes[i];
if (childBox.Text != null)
{
// is the box has text
var keepBox = !childBox.Text.IsEmptyOrWhitespace();
// is the box is pre-formatted
keepBox = keepBox || childBox.WhiteSpace == CssConstants.Pre || childBox.WhiteSpace == CssConstants.PreWrap;
// is the box is only one in the parent
keepBox = keepBox || box.Boxes.Count == 1;
// is it a whitespace between two inline boxes
keepBox = keepBox || (i > 0 && i < box.Boxes.Count - 1 && box.Boxes[i - 1].IsInline && box.Boxes[i + 1].IsInline);
// is first/last box where is in inline box and it's next/previous box is inline
keepBox = keepBox || (i == 0 && box.Boxes.Count > 1 && box.Boxes[1].IsInline && box.IsInline) || (i == box.Boxes.Count - 1 && box.Boxes.Count > 1 && box.Boxes[i - 1].IsInline && box.IsInline);
if (keepBox)
{
// valid text box, parse it to words
childBox.ParseToWords();
}
else
{
// remove text box that has no
childBox.ParentBox.Boxes.RemoveAt(i);
}
}
else
{
// recursive
CorrectTextBoxes(childBox);
}
}
}
/// <summary>
/// Execute action on all the "td" cells of the table.<br/>
/// Handle if there is "theader" or "tbody" exists.
/// </summary>
/// <param name="table">the table element</param>
/// <param name="action">the action to execute</param>
private static void SetForAllCells(CssBox table, ActionInt<CssBox> action)
{
foreach (var l1 in table.Boxes)
{
foreach (var l2 in l1.Boxes)
{
if (l2.HtmlTag != null && l2.HtmlTag.Name == "td")
{
action(l2);
}
else
{
foreach (var l3 in l2.Boxes)
{
action(l3);
}
}
}
}
}
/// <summary>
/// Assigns the given css classes to the given css box checking if matching.<br/>
/// Support multiple classes in single attribute separated by whitespace.
/// </summary>
/// <param name="box">the css box to assign css to</param>
/// <param name="cssData">the css data to use to get the matching css blocks</param>
private static void AssignClassCssBlocks(CssBox box, CssData cssData)
{
var classes = box.HtmlTag.TryGetAttribute("class");
var startIdx = 0;
while (startIdx < classes.Length)
{
while (startIdx < classes.Length && classes[startIdx] == ' ')
startIdx++;
if (startIdx < classes.Length)
{
var endIdx = classes.IndexOf(' ', startIdx);
if (endIdx < 0)
endIdx = classes.Length;
var cls = "." + classes.Substring(startIdx, endIdx - startIdx);
AssignCssBlocks(box, cssData, cls);
AssignCssBlocks(box, cssData, box.HtmlTag.Name + cls);
startIdx = endIdx + 1;
}
}
}
/// <summary>
/// Go over all image boxes and if its display style is set to block, put it inside another block but set the image to inline.
/// </summary>
/// <param name="box">the current box to correct its sub-tree</param>
private static void CorrectImgBoxes(CssBox box)
{
for (int i = box.Boxes.Count - 1; i >= 0; i--)
{
var childBox = box.Boxes[i];
if (childBox is CssBoxImage && childBox.Display == CssConstants.Block)
{
var block = CssBox.CreateBlock(childBox.ParentBox, null, childBox);
childBox.ParentBox = block;
childBox.Display = CssConstants.Inline;
}
else
{
// recursive
CorrectImgBoxes(childBox);
}
}
}
/// <summary>
/// Assigns the given css style blocks to the given css box checking if matching.
/// </summary>
/// <param name="box">the css box to assign css to</param>
/// <param name="cssData">the css data to use to get the matching css blocks</param>
/// <param name="className">the class selector to search for css blocks</param>
private static void AssignCssBlocks(CssBox box, CssData cssData, string className)
{
var blocks = cssData.GetCssBlock(className);
foreach (var block in blocks)
{
if (IsBlockAssignableToBox(box, block))
{
AssignCssBlock(box, block);
}
}
}
/// <summary>
/// Correct DOM tree if there is block boxes that are inside inline blocks.<br/>
/// Need to rearrange the tree so block box will be only the child of other block box.
/// </summary>
/// <param name="box">the current box to correct its sub-tree</param>
private static void CorrectBlockInsideInline(CssBox box)
{
try
{
if (DomUtils.ContainsInlinesOnly(box) && !ContainsInlinesOnlyDeep(box))
{
var tempRightBox = CorrectBlockInsideInlineImp(box);
while (tempRightBox != null)
{
// loop on the created temp right box for the fixed box until no more need (optimization remove recursion)
CssBox newTempRightBox = null;
if (DomUtils.ContainsInlinesOnly(tempRightBox) && !ContainsInlinesOnlyDeep(tempRightBox))
newTempRightBox = CorrectBlockInsideInlineImp(tempRightBox);
tempRightBox.ParentBox.SetAllBoxes(tempRightBox);
tempRightBox.ParentBox = null;
tempRightBox = newTempRightBox;
}
}
if (!DomUtils.ContainsInlinesOnly(box))
{
foreach (var childBox in box.Boxes)
{
CorrectBlockInsideInline(childBox);
}
}
}
catch (Exception ex)
{
box.HtmlContainer.ReportError(HtmlRenderErrorType.HtmlParsing, "Failed in block inside inline box correction", ex);
}
}
/// <summary>
/// Check if the given css block is assignable to the given css box.<br/>
/// the block is assignable if it has no hierarchical selectors or if the hierarchy matches.<br/>
/// Special handling for ":hover" pseudo-class.<br/>
/// </summary>
/// <param name="box">the box to check assign to</param>
/// <param name="block">the block to check assign of</param>
/// <returns>true - the block is assignable to the box, false - otherwise</returns>
private static bool IsBlockAssignableToBox(CssBox box, CssBlock block)
{
bool assignable = true;
if (block.Selectors != null)
{
assignable = IsBlockAssignableToBoxWithSelector(box, block);
}
else if (box.HtmlTag.Name.Equals("a", StringComparison.OrdinalIgnoreCase) && block.Class.Equals("a", StringComparison.OrdinalIgnoreCase) && !box.HtmlTag.HasAttribute("href"))
{
assignable = false;
}
if (assignable && block.Hover)
{
box.HtmlContainer.AddHoverBox(box, block);
assignable = false;
}
return assignable;
}
/// <summary>
/// Split bad box that has inline and block boxes into two parts, the left - before the block box
/// and right - after the block box.
/// </summary>
/// <param name="parentBox">the parent box that has the problem</param>
/// <param name="badBox">the box to split into different boxes</param>
/// <param name="leftBlock">the left block box that is created for the split</param>
private static void CorrectBlockSplitBadBox(CssBox parentBox, CssBox badBox, CssBox leftBlock)
{
CssBox leftbox = null;
while (badBox.Boxes[0].IsInline && ContainsInlinesOnlyDeep(badBox.Boxes[0]))
{
if (leftbox == null)
{
// if there is no elements in the left box there is no reason to keep it
leftbox = CssBox.CreateBox(leftBlock, badBox.HtmlTag);
leftbox.InheritStyle(badBox, true);
}
badBox.Boxes[0].ParentBox = leftbox;
}
var splitBox = badBox.Boxes[0];
if (!ContainsInlinesOnlyDeep(splitBox))
{
CorrectBlockSplitBadBox(parentBox, splitBox, leftBlock);
splitBox.ParentBox = null;
}
else
{
splitBox.ParentBox = parentBox;
}
if (badBox.Boxes.Count > 0)
{
CssBox rightBox;
if (splitBox.ParentBox != null || parentBox.Boxes.Count < 3)
{
rightBox = CssBox.CreateBox(parentBox, badBox.HtmlTag);
rightBox.InheritStyle(badBox, true);
if (parentBox.Boxes.Count > 2)
rightBox.SetBeforeBox(parentBox.Boxes[1]);
if (splitBox.ParentBox != null)
splitBox.SetBeforeBox(rightBox);
}
else
{
rightBox = parentBox.Boxes[2];
}
rightBox.SetAllBoxes(badBox);
}
else if (splitBox.ParentBox != null && parentBox.Boxes.Count > 1)
{
splitBox.SetBeforeBox(parentBox.Boxes[1]);
if (splitBox.HtmlTag != null && splitBox.HtmlTag.Name == "br" && (leftbox != null || leftBlock.Boxes.Count > 1))
splitBox.Display = CssConstants.Inline;
}
}
/// <summary>
/// Check if the given css block is assignable to the given css box by validating the selector.<br/>
/// </summary>
/// <param name="box">the box to check assign to</param>
/// <param name="block">the block to check assign of</param>
/// <returns>true - the block is assignable to the box, false - otherwise</returns>
private static bool IsBlockAssignableToBoxWithSelector(CssBox box, CssBlock block)
{
foreach (var selector in block.Selectors)
{
bool matched = false;
while (!matched)
{
box = box.ParentBox;
while (box != null && box.HtmlTag == null)
box = box.ParentBox;
if (box == null)
return false;
if (box.HtmlTag.Name.Equals(selector.Class, StringComparison.InvariantCultureIgnoreCase))
matched = true;
if (!matched && box.HtmlTag.HasAttribute("class"))
{
var className = box.HtmlTag.TryGetAttribute("class");
if (selector.Class.Equals("." + className, StringComparison.InvariantCultureIgnoreCase) || selector.Class.Equals(box.HtmlTag.Name + "." + className, StringComparison.InvariantCultureIgnoreCase))
matched = true;
}
if (!matched && box.HtmlTag.HasAttribute("id"))
{
var id = box.HtmlTag.TryGetAttribute("id");
if (selector.Class.Equals("#" + id, StringComparison.InvariantCultureIgnoreCase))
matched = true;
}
if (!matched && selector.DirectParent)
return false;
}
}
return true;
}
/// <summary>
/// Check if the given box contains only inline child boxes in all subtree.
/// </summary>
/// <param name="box">the box to check</param>
/// <returns>true - only inline child boxes, false - otherwise</returns>
private static bool ContainsInlinesOnlyDeep(CssBox box)
{
foreach (var childBox in box.Boxes)
{
if (!childBox.IsInline || !ContainsInlinesOnlyDeep(childBox))
{
return false;
}
}
return true;
}
/// <summary>
/// Assigns the given css style block properties to the given css box.
/// </summary>
/// <param name="box">the css box to assign css to</param>
/// <param name="block">the css block to assign</param>
private static void AssignCssBlock(CssBox box, CssBlock block)
{
foreach (var prop in block.Properties)
{
var value = prop.Value;
if (prop.Value == CssConstants.Inherit && box.ParentBox != null)
{
value = CssUtils.GetPropertyValue(box.ParentBox, prop.Key);
}
if (IsStyleOnElementAllowed(box, prop.Key, value))
{
CssUtils.SetPropertyValue(box, prop.Key, value);
}
}
}
/// <summary>
/// Read styles defined inside the dom structure in links and style elements.<br/>
/// If the html tag is "style" tag parse it content and add to the css data for all future tags parsing.<br/>
/// If the html tag is "link" that point to style data parse it content and add to the css data for all future tags parsing.<br/>
/// </summary>
/// <param name="box">the box to parse style data in</param>
/// <param name="htmlContainer">the html container to use for reference resolve</param>
/// <param name="cssData">the style data to fill with found styles</param>
/// <param name="cssDataChanged">check if the css data has been modified by the handled html not to change the base css data</param>
private void CascadeParseStyles(CssBox box, HtmlContainerInt htmlContainer, ref CssData cssData, ref bool cssDataChanged)
{
if (box.HtmlTag != null)
{
// Check for the <link rel=stylesheet> tag
if (box.HtmlTag.Name.Equals("link", StringComparison.CurrentCultureIgnoreCase) &&
box.GetAttribute("rel", string.Empty).Equals("stylesheet", StringComparison.CurrentCultureIgnoreCase))
{
CloneCssData(ref cssData, ref cssDataChanged);
string stylesheet;
CssData stylesheetData;
StylesheetLoadHandler.LoadStylesheet(htmlContainer, box.GetAttribute("href", string.Empty), box.HtmlTag.Attributes, out stylesheet, out stylesheetData);
if (stylesheet != null)
_cssParser.ParseStyleSheet(cssData, stylesheet);
else if (stylesheetData != null)
cssData.Combine(stylesheetData);
}
// Check for the <style> tag
if (box.HtmlTag.Name.Equals("style", StringComparison.CurrentCultureIgnoreCase) && box.Boxes.Count > 0)
{
CloneCssData(ref cssData, ref cssDataChanged);
foreach (var child in box.Boxes)
_cssParser.ParseStyleSheet(cssData, child.Text.CutSubstring());
}
}
foreach (var childBox in box.Boxes)
{
CascadeParseStyles(childBox, htmlContainer, ref cssData, ref cssDataChanged);
}
}
/// <summary>
/// Check if the given style is allowed to be set on the given css box.<br/>
/// Used to prevent invalid CssBoxes creation like table with inline display style.
/// </summary>
/// <param name="box">the css box to assign css to</param>
/// <param name="key">the style key to cehck</param>
/// <param name="value">the style value to check</param>
/// <returns>true - style allowed, false - not allowed</returns>
private static bool IsStyleOnElementAllowed(CssBox box, string key, string value)
{
if (box.HtmlTag != null && key == HtmlConstants.Display)
{
switch (box.HtmlTag.Name)
{
case HtmlConstants.Table:
return value == CssConstants.Table;
case HtmlConstants.Tr:
return value == CssConstants.TableRow;
case HtmlConstants.Tbody:
return value == CssConstants.TableRowGroup;
case HtmlConstants.Thead:
return value == CssConstants.TableHeaderGroup;
case HtmlConstants.Tfoot:
return value == CssConstants.TableFooterGroup;
case HtmlConstants.Col:
return value == CssConstants.TableColumn;
case HtmlConstants.Colgroup:
return value == CssConstants.TableColumnGroup;
case HtmlConstants.Td:
case HtmlConstants.Th:
return value == CssConstants.TableCell;
case HtmlConstants.Caption:
return value == CssConstants.TableCaption;
}
}
return true;
}
