/// <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);
}
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);
}