private IElement CreateElem(EStyleCommand cmd, string styleAttr, IDocument document, Func <string> attributeValue)
{
IElement elem = null;
var name = GetElementName(cmd);
switch (cmd)
{
case EStyleCommand.Font:
elem = document.CreateElement(name);
elem.SetAttribute(HTMLConstants.Style, ReDefineStyle(styleAttr, HTMLConstants.StyleFontFamily, attributeValue()));
break;
case EStyleCommand.Bold:
case EStyleCommand.Emphasis:
elem = document.CreateElement(name);
break;
case EStyleCommand.Color:
elem = document.CreateElement(name);
elem.SetAttribute(HTMLConstants.Style, ReDefineStyle(styleAttr, HTMLConstants.StyleColor, attributeValue()));
break;
case EStyleCommand.BackGroundColor:
elem = document.CreateElement(name);
elem.SetAttribute(HTMLConstants.Style, ReDefineStyle(styleAttr, HTMLConstants.StyleBackColor, attributeValue()));
break;
}
return(elem);
}
private bool CommandIsBlockNodeCommand(EStyleCommand cmd)
{
return(cmd == EStyleCommand.TextAlignCentre ||
cmd == EStyleCommand.TextAlignJustify ||
cmd == EStyleCommand.TextAlignLeft ||
cmd == EStyleCommand.TextAlignRight);
}
private void ApplyElementStyle(EStyleCommand cmd, INode node, Func <string> attributeValue, IDocument document)
{
INode parentElem = null;
switch (cmd)
{
case EStyleCommand.Font:
StyleAttribute = ReDefineStyle(StyleAttribute, HTMLConstants.StyleFontFamily, attributeValue());
GetParentElement(node).SetAttribute(HTMLConstants.Style, StyleAttribute);
break;
case EStyleCommand.Bold:
parentElem = ParentElementAlreadyExists(node, HTMLConstants.SpanStrong);
if (parentElem != null)
{
RemoveFromParentKeepContent(node, HTMLConstants.SpanStrong, document);
}
else
{
var strong = document.CreateElement(HTMLConstants.SpanStrong);
GetParentElement(node).ReplaceChild(strong, node);
strong.AppendChild(node);
}
break;
case EStyleCommand.Emphasis:
parentElem = ParentElementAlreadyExists(node, HTMLConstants.SpanEm);
if (parentElem != null)
{
RemoveFromParentKeepContent(node, HTMLConstants.SpanEm, document);
}
else
{
var em = document.CreateElement(HTMLConstants.SpanEm);
em.TextContent = node.TextContent;
node.TextContent = "";
GetParentElement(node).ReplaceChild(em, node);
}
break;
case EStyleCommand.Color:
StyleAttribute = ReDefineStyle(StyleAttribute, HTMLConstants.StyleColor, attributeValue());
GetParentElement(node).SetAttribute(HTMLConstants.Style, StyleAttribute);
break;
case EStyleCommand.BackGroundColor:
StyleAttribute = ReDefineStyle(StyleAttribute, HTMLConstants.StyleBackColor, attributeValue());
GetParentElement(node).SetAttribute(HTMLConstants.Style, StyleAttribute);
break;
case EStyleCommand.FormatClear:
GetParentElement(node).SetAttribute(HTMLConstants.Style, "");
break;
}
}
private string GetElementName(EStyleCommand cmd)
{
switch (cmd)
{
case EStyleCommand.Bold:
return(HTMLConstants.SpanStrong);
case EStyleCommand.Emphasis:
return(HTMLConstants.SpanEm);
default:
return(HTMLConstants.SpanTag);
}
}
/// <summary>
/// Applies/Unapplies style to the elements in the given range.
/// </summary>
/// <param name="range">Range</param>
/// <param name="cmd">A style command</param>
/// <param name="document"></param>
/// <param name="attributeValue">The attribute value, that fits the style command</param>
public void ApplyStyleCommand(MarkUpRange range, EStyleCommand cmd, IDocument document, Func <string> attributeValue)
{
IElement elem;
void createStyleElement()
{
elem = CreateElem(cmd, StyleAttribute, document, attributeValue);
}
var isCmdForBlockElement = CommandIsBlockNodeCommand(cmd);
if (cmd == EStyleCommand.FormatClear)
{
var elementWithStyle = FindParentElementWithAStyleAttribute(Node) as IElement;
if (elementWithStyle != null)
{
elementWithStyle.RemoveAttribute(HTMLConstants.Style);
if (elementWithStyle.NodeName == HTMLConstants.SpanTag)
{
RemoveFromParentKeepContent(Node, HTMLConstants.SpanTag, document);
}
}
return;
}
if (isCmdForBlockElement)
{
var blockElement = FindBlockParent(Node) as IElement;
if (blockElement != null)
{
var blockstyleAttr = blockElement.GetAttribute(HTMLConstants.Style);
StyleAttribute = ReDefineStyle(blockstyleAttr, HTMLConstants.TextAlign, attributeValue());
blockElement.SetAttribute(HTMLConstants.Style, StyleAttribute);
}
return;
}
var rangeLength = (range.PositionEnd - range.PositionStart);
var posEndWord = range.PositionEnd - Offset;
var posStartWord = range.PositionStart > Offset ? range.PositionStart - Offset : 0;
string nodeText = Node.TextContent;
int nodeTextLength = Node.TextContent.Length;
if (nodeText.Trim().Length == 0)
{
return;
}
_styleattribute = GetParentElement(Node).GetAttribute(HTMLConstants.Style);
if (RangeOutreachesTexNodeLength(range, nodeTextLength))
{
ApplyElementStyle(cmd, this.Node, attributeValue, document);
return;
}
if (ContainsZeroCharachtersOrOnlyWhiteSpaces(posStartWord, posEndWord, nodeText))
{
return;
}
var poslength = posEndWord - posStartWord;
if (poslength == 0)
{
poslength = 1;
}
string extractedTextRange = nodeText.Substring(posStartWord, poslength);
//rangeLength == 0 -> no selection only cursor. Then apply style to the word under the cursor
if (rangeLength == 0)
{
var startIndex = Math.Max(nodeText.LastIndexOf(" ", posStartWord), nodeText.LastIndexOf((char)160, posStartWord));
startIndex = startIndex == -1 ? 0 : startIndex;
var endIndex = Math.Max(nodeText.IndexOf(" ", posStartWord), nodeText.IndexOf((char)160, posStartWord));
endIndex = endIndex == -1 ? nodeTextLength : endIndex;
extractedTextRange = ExtractWord(startIndex, endIndex, nodeText);
if (extractedTextRange == "")
{
return;
}
posStartWord = startIndex == 0 ? startIndex : startIndex + 1;
}
posEndWord = extractedTextRange.Length;
if (ExtractedRangeEqualsTextRange(extractedTextRange, nodeText) || isCmdForBlockElement)
{
ApplyElementStyle(cmd, Node, attributeValue, document);
return;
}
if (ExtractedRangeIsAtStartOfTextRange(posStartWord))
{
createStyleElement();
elem.TextContent = nodeText.Substring(0, posEndWord);
((ICharacterData)Node).Data = nodeText.Substring(posEndWord);
Node.InsertBefore(new[] { elem });
return;
}
if (ExtractedRangeIsAtEndOfTextRange(posStartWord, posEndWord, extractedTextRange))
{
createStyleElement();
elem.TextContent = nodeText.Substring(posStartWord);
Node.TextContent = nodeText.Substring(0, posStartWord);
Node.InsertAfter(new[] { elem });
return;
}
//range is in the middle of the textnode
var newElementname = GetElementName(cmd);
if (newElementname != HTMLConstants.SpanTag)
{
var alreadyPresent = ParentElementAlreadyExists(Node, newElementname.ToUpper());
if (alreadyPresent != null && alreadyPresent.IndexOf(Node) != 0)
{
//redefine all
ApplyElementStyle(cmd, Node, attributeValue, document);
return;
}
}
createStyleElement();
elem.TextContent = nodeText.Substring(posStartWord, posEndWord);
Node.TextContent = nodeText.Substring(0, posStartWord);
var restNode = Node.Clone();
restNode.TextContent = nodeText.Substring(posStartWord + posEndWord);
Node.ReplaceWith(new[] { Node.Clone(), elem, restNode });
}