/// <summary>
/// Parse color property to add only valid color.
/// </summary>
/// <param name="propName">the name of the css property to add</param>
/// <param name="propValue">the value of the css property to add</param>
/// <param name="properties">the properties collection to add to</param>
private static void ParseColorProperty(string propName, string propValue, Dictionary <string, string> properties)
{
if (CssValueParser.IsColorValid(propValue))
{
properties[propName] = propValue;
}
}
/// <summary>
/// Parse length property to add only valid lengths.
/// </summary>
/// <param name="propName">the name of the css property to add</param>
/// <param name="propValue">the value of the css property to add</param>
/// <param name="properties">the properties collection to add to</param>
private static void ParseLengthProperty(string propName, string propValue, Dictionary <string, string> properties)
{
if (CssValueParser.IsValidLength(propValue) || propValue.Equals(CssConstants.Auto, StringComparison.OrdinalIgnoreCase))
{
properties[propName] = propValue;
}
}
/// <summary>
/// Split multi direction value into the proper direction values (left, top, right, bottom).
/// </summary>
private static void SplitMultiDirectionValues(string propValue, out string left, out string top, out string right, out string bottom)
{
top = null;
left = null;
right = null;
bottom = null;
string[] values = CssValueParser.SplitValues(propValue);
switch (values.Length)
{
case 1:
top = left = right = bottom = values[0];
break;
case 2:
top = bottom = values[0];
left = right = values[1];
break;
case 3:
top = values[0];
left = right = values[1];
bottom = values[2];
break;
case 4:
top = values[0];
right = values[1];
bottom = values[2];
left = values[3];
break;
}
}
/// <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="bridge"> </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, object bridge, 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"))
{
AssignCssBlocks(box, cssData, "." + box.HtmlTag.Attributes["class"]);
AssignCssBlocks(box, cssData, box.HtmlTag.Name + "." + box.HtmlTag.Attributes["class"]);
}
// try assign style using the "id" attribute of the html element
if (box.HtmlTag.HasAttribute("id"))
{
AssignCssBlocks(box, cssData, "#" + box.HtmlTag.Attributes["id"]);
}
HtmlParser.TranslateAttributes(box.HtmlTag, box);
// Check for the style="" attribute
if (box.HtmlTag.HasAttribute("style"))
{
var block = CssParser.ParseCssBlockImp(box.HtmlTag.Name, box.HtmlTag.Attributes["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);
}
// 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);
var styleSheet = CssValueParser.GetStyleSheet(box.GetAttribute("href", string.Empty), bridge);
CssParser.ParseStyleSheet(cssData, styleSheet);
}
}
foreach (var childBox in box.Boxes)
{
CascadeStyles(childBox, bridge, ref cssData, ref cssDataChanged);
}
}
/// <summary>
/// Set the selected text style (selection text color and background color).
/// </summary>
/// <param name="htmlContainer"> </param>
/// <param name="cssData">the style data</param>
private static void SetTextSelectionStyle(HtmlContainer htmlContainer, CssData cssData)
{
htmlContainer.SelectionForeColor = Color.Empty;
htmlContainer.SelectionBackColor = Color.Empty;
if (cssData.ContainsCssBlock("::selection"))
{
var blocks = cssData.GetCssBlock("::selection");
foreach (var block in blocks)
{
if (block.Properties.ContainsKey("color"))
{
htmlContainer.SelectionForeColor = CssValueParser.GetActualColor(block.Properties["color"]);
}
if (block.Properties.ContainsKey("background-color"))
{
htmlContainer.SelectionBackColor = CssValueParser.GetActualColor(block.Properties["background-color"]);
}
}
}
}
/// <summary>
/// Parse a complex border property value that contains multiple css properties into specific css properties.
/// </summary>
/// <param name="propValue">the value of the property to parse to specific values</param>
/// <param name="direction">the left, top, right or bottom direction of the border to parse</param>
/// <param name="properties">the properties collection to add the specific properties to</param>
private static void ParseBorderProperty(string propValue, string direction, Dictionary <string, string> properties)
{
string borderWidth;
string borderStyle;
string borderColor;
CssValueParser.ParseBorder(propValue, out borderWidth, out borderStyle, out borderColor);
if (direction != null)
{
if (borderWidth != null)
{
properties["border" + direction + "-width"] = borderWidth;
}
if (borderStyle != null)
{
properties["border" + direction + "-style"] = borderStyle;
}
if (borderColor != null)
{
properties["border" + direction + "-color"] = borderColor;
}
}
else
{
if (borderWidth != null)
{
ParseBorderWidthProperty(borderWidth, properties);
}
if (borderStyle != null)
{
ParseBorderStyleProperty(borderStyle, properties);
}
if (borderColor != null)
{
ParseBorderColorProperty(borderColor, properties);
}
}
}
