/// <summary>
/// Applies style to all boxes in the tree.<br/>
/// If the html tag has style defined for each apply that style to the css box of the tag.<br/>
/// If the html tag has "class" attribute and the class name has style defined apply that style on the tag css box.<br/>
/// If the html tag has "style" attribute parse it and apply the parsed style on the tag css box.<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"></param>
/// <param name="htmlContainer">the html container to use for reference resolve</param>
/// <param name="cssData"> </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 static void CascadeStyles(CssBox box, HtmlContainer htmlContainer, ref CssData cssData, ref bool cssDataChanged)
{
box.InheritStyle();
if (box.HtmlTag != null)
{
// try assign style using the html element tag
AssignCssBlocks(box, cssData, box.HtmlTag.Name);
// try assign style using the "class" attribute of the html element
if (box.HtmlTag.HasAttribute("class"))
{
AssignClassCssBlocks(box, cssData);
}
// try assign style using the "id" attribute of the html element
if (box.HtmlTag.HasAttribute("id"))
{
var id = box.HtmlTag.TryGetAttribute("id");
AssignCssBlocks(box, cssData, "#" + id);
}
TranslateAttributes(box.HtmlTag, box);
// Check for the style="" attribute
if (box.HtmlTag.HasAttribute("style"))
{
var block = CssParser.ParseCssBlock(box.HtmlTag.Name, box.HtmlTag.TryGetAttribute("style"));
AssignCssBlock(box, block);
}
// Check for the <style> tag
if (box.HtmlTag.Name.Equals("style", StringComparison.CurrentCultureIgnoreCase) && box.Boxes.Count == 1)
{
CloneCssData(ref cssData, ref cssDataChanged);
CssParser.ParseStyleSheet(cssData, box.Boxes[0].Text.CutSubstring());
}
// 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);
}
}
}
// cascade text decoration only to boxes that actually have text so it will be handled correctly.
if (box.TextDecoration != String.Empty && box.Text == null)
{
foreach (var childBox in box.Boxes)
{
childBox.TextDecoration = box.TextDecoration;
}
box.TextDecoration = string.Empty;
}
foreach (var childBox in box.Boxes)
{
CascadeStyles(childBox, htmlContainer, ref cssData, ref cssDataChanged);
}
}
/// <summary>
///
/// </summary>
/// <param name="tag"></param>
/// <param name="box"></param>
private static 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;
}
}
}
}
