/// <summary>
/// Find the most logic direction to move the cursor so that it matches the where has clicked
/// </summary>
/// <param name="Selection"></param>
/// <returns></returns>
public static Direction FindSelectionToLogicalPosition(MarkupRange Selection, IHTMLElement body, bool?forward)
{
// There is a selection, not just a click
if (!Selection.Start.IsEqualTo(Selection.End))
{
return(Direction.None);
}
Direction dir = ImageBreakout(Selection.Start);
if (dir != Direction.None)
{
return(dir);
}
MarkupContext contextRight = Selection.Start.Right(false);
MarkupContext contextLeft = Selection.Start.Left(false);
// there is text or some other type of content around the click
if (!((contextLeft.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_EnterScope || contextLeft.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_ExitScope) &&
(contextRight.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_EnterScope || contextRight.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_ExitScope)))
{
return(Direction.None);
}
// The click is not between two block elements, so it should be fine where it is
if (!ElementFilters.IsBlockElement(contextLeft.Element) || !ElementFilters.IsBlockElement(contextRight.Element))
{
return(Direction.None);
}
// </blockElement>|</postBody>
if (contextLeft.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_EnterScope &&
!IsSmartContent(contextLeft) &&
contextRight.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_ExitScope &&
contextRight.Element.id == body.id)
{
return(Direction.Left);
}
// <postBody>|<blockElement>
if (contextRight.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_EnterScope &&
!IsSmartContent(contextRight) &&
contextLeft.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_ExitScope &&
contextLeft.Element.id == body.id)
{
return(Direction.Right);
}
// </blockElement>|<blockElement>
if (contextLeft.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_EnterScope &&
!IsSmartContent(contextLeft) &&
contextRight.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_EnterScope &&
!IsSmartContent(contextRight))
{
return(forward == null || forward == true ? Direction.Right : Direction.Left);
}
return(Direction.None);
}
/// <summary>
/// Returns true if this range is composes entirely of non-visible elements.
/// </summary>
/// <param name="inScopeContextsOnly">flag to ignore out of scope element
/// (use false unless you absolutely want to ignore visible content in cases like
/// [start]<p>[end]</p>)</param>
/// <returns></returns>
public bool IsEmptyOfContent(bool inScopeContextsOnly)
{
try
{
bool isEmptyOfContent = true;
WalkRange(
delegate(MarkupRange currentRange, MarkupContext context, string text)
{
text = text ?? string.Empty;
if (!String.IsNullOrEmpty(text.Trim()))
{
isEmptyOfContent = false;
return(false);
}
if (context.Element != null && ElementFilters.IsVisibleEmptyElement(context.Element))
{
isEmptyOfContent = false;
return(false);
}
// Continue walking the range.
return(true);
},
inScopeContextsOnly);
return(isEmptyOfContent);
}
catch (Exception)
{
return(false);
}
}
public static MarkupRange GetEditableRange(IHTMLElement e, MshtmlMarkupServices markupServices)
{
IHTMLElement3 editableElement = null;
while (e != null)
{
if (((IHTMLElement3)e).isContentEditable)
{
editableElement = (IHTMLElement3)e;
if (ElementFilters.IsBlockElement(e))
{
break;
}
}
else
{
break;
}
e = e.parentElement;
}
if (editableElement != null)
{
return(markupServices.CreateMarkupRange((IHTMLElement)editableElement, false));
}
else
{
return(null);
}
}
private static MoveFilterResult StopBeforeExitBlock(MarkupContext mc)
{
if (mc.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_ExitScope && ElementFilters.IsBlockElement(mc.Element))
{
return(MoveFilterResult.STOP_BACK);
}
return(MoveFilterResult.CONTINUE);
}
private static MoveFilterResult StopAfterEnterBlock(MarkupContext mc)
{
if (mc.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_EnterScope && ElementFilters.IsBlockElement(mc.Element))
{
return(MoveFilterResult.STOP);
}
return(MoveFilterResult.CONTINUE);
}
/// <summary>
/// Retrieves the block element that this pointer is positioned within.
/// </summary>
public IHTMLElement CurrentBlockScope()
{
IHTMLElement parent = CurrentScope;
while (parent != null && !ElementFilters.IsBlockElement(parent))
{
parent = parent.parentElement;
}
return(parent);
}
private static MoveFilterResult StopBeforeVisible(MarkupContext mc)
{
if (mc.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_Text)
{
return(MoveFilterResult.STOP_BACK);
}
if (mc.Element != null && ElementFilters.IsInlineElement(mc.Element) && !ElementFilters.IsVisibleEmptyElement(mc.Element))
{
return(MoveFilterResult.CONTINUE);
}
return(MoveFilterResult.STOP_BACK);
}
public void RemoveElementsByTagId(_ELEMENT_TAG_ID tagId, bool onlyIfNoAttributes)
{
if (tagId == _ELEMENT_TAG_ID.TAGID_NULL)
{
return;
}
// Remove the tagId up the parent chain
IHTMLElement currentElement = ParentElement();
while (currentElement != null)
{
if (MarkupServices.GetElementTagId(currentElement) == tagId &&
(!onlyIfNoAttributes || !HTMLElementHelper.HasMeaningfulAttributes(currentElement)))
{
try
{
MarkupServices.RemoveElement(currentElement);
}
catch (COMException e)
{
Trace.Fail(String.Format("Failed to remove element ({0}) with error: {1}",
currentElement.outerHTML, // {0}
e // {1}
));
}
}
currentElement = currentElement.parentElement;
}
// Remove any other instances
IHTMLElement[] elements =
GetElements(ElementFilters.CreateTagIdFilter(MarkupServices.GetNameForTagId(tagId)), false);
foreach (IHTMLElement e in elements)
{
if (MarkupServices.GetElementTagId(e) == tagId &&
(!onlyIfNoAttributes || !HTMLElementHelper.HasMeaningfulAttributes(e)))
{
try
{
MarkupServices.RemoveElement(e);
}
catch (COMException ex)
{
Trace.Fail(String.Format("Failed to remove element ({0}) with error: {1}",
e.outerHTML, // {0}
ex // {1}
));
}
}
}
}
public static void SplitBlockForInsertionOrBreakout(MshtmlMarkupServices markupServices, MarkupRange bounds, MarkupPointer insertAt)
{
IHTMLElement currentBlock = insertAt.GetParentElement(ElementFilters.BLOCK_OR_TABLE_CELL_ELEMENTS);
if (currentBlock == null)
{
return;
}
if (ElementFilters.IsBlockQuoteElement(currentBlock) || ElementFilters.IsTableCellElement(currentBlock))
{
return;
}
MarkupPointer blockStart = markupServices.CreateMarkupPointer(currentBlock, _ELEMENT_ADJACENCY.ELEM_ADJ_BeforeBegin);
MarkupPointer blockEnd = markupServices.CreateMarkupPointer(currentBlock, _ELEMENT_ADJACENCY.ELEM_ADJ_AfterEnd);
if (bounds != null && (blockStart.IsLeftOf(bounds.Start) || blockEnd.IsRightOf(bounds.End)))
{
return;
}
// Don't split if at the beginning or end of the visible content in the block.
// Instead just move the insertion point outside the block.
MarkupRange testRange = markupServices.CreateMarkupRange();
testRange.Start.MoveToPointer(insertAt);
testRange.End.MoveAdjacentToElement(currentBlock, _ELEMENT_ADJACENCY.ELEM_ADJ_BeforeEnd);
if (testRange.IsEmptyOfContent())
{
insertAt.MoveAdjacentToElement(currentBlock, _ELEMENT_ADJACENCY.ELEM_ADJ_AfterEnd);
return;
}
testRange.Start.MoveAdjacentToElement(currentBlock, _ELEMENT_ADJACENCY.ELEM_ADJ_AfterBegin);
testRange.End.MoveToPointer(insertAt);
if (testRange.IsEmptyOfContent())
{
insertAt.MoveAdjacentToElement(currentBlock, _ELEMENT_ADJACENCY.ELEM_ADJ_BeforeBegin);
return;
}
MarkupPointer moveTarget = markupServices.CreateMarkupPointer(blockEnd);
markupServices.Move(insertAt, blockEnd, moveTarget);
insertAt.MoveAdjacentToElement(currentBlock, _ELEMENT_ADJACENCY.ELEM_ADJ_AfterEnd);
}
//this is similar to the GetTopLevelElements except will also return table cells if correct filter
// is set and recurse is equal to true
public IHTMLElement[] GetTopLevelBlocksAndCells(IHTMLElementFilter filter, bool recurse)
{
ArrayList list = new ArrayList();
Hashtable usedElements = new Hashtable();
MarkupPointer p = MarkupServices.CreateMarkupPointer(Start);
MarkupContext context = p.Right(false);
//move p through the range to locate each of the top level elements
while (p.IsLeftOf(End))
{
if (context.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_EnterScope || context.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_NoScope)
{
p.MoveAdjacentToElement(context.Element, _ELEMENT_ADJACENCY.ELEM_ADJ_AfterEnd);
if (usedElements[context.Element] == null)
{
if (p.IsLeftOfOrEqualTo(End) && (filter == null || filter(context.Element)))
{
list.Add(context.Element);
}
//special case--inside of a table element, want to get out the cells inside
else if (recurse && ElementFilters.TABLE_ELEMENTS(context.Element))
{
MarkupRange newRange = MarkupServices.CreateMarkupRange(context.Element);
newRange.Start.MoveAdjacentToElement(context.Element, _ELEMENT_ADJACENCY.ELEM_ADJ_AfterBegin);
if (newRange.Start.IsLeftOf(Start))
{
newRange.Start.MoveToPointer(Start);
}
if (newRange.End.IsRightOf(End))
{
newRange.End.MoveToPointer(End);
}
//recursively check inside table element for table cells
list.AddRange(newRange.GetTopLevelBlocksAndCells(filter, true));
}
//cache the fact that we've already tested this element.
usedElements[context.Element] = context.Element;
}
}
p.Right(true, context);
}
return(HTMLElementHelper.ToElementArray(list));
}
/// <summary>
/// Determines if a range has a particular _ELEMENT_TAG_ID applied.
/// </summary>
/// <param name="tagId"></param>
/// <param name="partially">If true, then IsTagId will return true if any part of it is contained within a tagId element.
/// If false, then IsTagId will return true only if the range is entirely contained within a tagId element.</param>
/// <returns></returns>
public bool IsTagId(_ELEMENT_TAG_ID tagId, bool partially)
{
// This first block of code will return true if the range is entirely contained within an element with the given tagId.
IHTMLElement currentElement = ParentElement();
while (currentElement != null)
{
if (MarkupServices.GetElementTagId(currentElement) == tagId)
{
return(true);
}
currentElement = currentElement.parentElement;
}
// This second block of code will return true if the range is partially contained within an element with the given tagId.
if (partially)
{
IHTMLElement[] elements = GetElements(ElementFilters.CreateTagIdFilter(MarkupServices.GetNameForTagId(tagId)), false);
return(elements.Length > 0);
}
return(false);
}
