internal static ParagraphsToMerge create(IWindowSelection windowSelection)
{
//multiple ranges when several (separate) cells are selected
//could support this scenario later but it's uncessarily
//complicated for a demo so for now simply disable the
//'merge paragraphs' feature when the selection includes table cells
if (windowSelection.rangeCount != 1)
{
return(null);
}
try
{
//get the selected range
using (IDomRange domRange = windowSelection.getRangeAt(0))
{
return(create(domRange));
}
}
catch
{
return(null);
}
}
static ParagraphsToMerge create(IDomRange domRange)
{
//find the block-level element associated with the start of the range
IDomNode startBlock = findBlock(domRange.startContainer, domRange.startOffset, true);
//find the block-level element associated with the end of the range
IDomNode endBlock = findBlock(domRange.endContainer, domRange.endOffset, false);
//block may be null if it's positioned directly under a <td>
//which (removing things from a table) isn't a scenario supported by this class
if ((startBlock == null) || (endBlock == null))
{
return(null);
}
//iterate the inline-level elements to be moved
List <List <IDomNode> > selected = new List <List <IDomNode> >();
IDomNode currentBlock = startBlock;
for (; ;)
{
//get the inline elements inside this block
List <IDomNode> children = null;
bool childIsBlock = false;
foreach (IDomNode child in currentBlock.childNodes.elements)
{
if (!isBlock(child))
{
//found an inline child
if (children == null)
{
children = new List <IDomNode>();
}
children.Add(child);
}
else
{
//child of this block is itself a block
currentBlock = child;
childIsBlock = true;
break;
}
}
if (children != null)
{
//found some inline children
selected.Add(children);
}
if (childIsBlock)
{
//descend: iterate this child block
continue;
}
//else finished iterating children of currentBlock
if (ReferenceEquals(currentBlock, endBlock))
{
//currentBlock is the last block we wanted to iterate
break;
}
//find the next block to iterate
for (; ;)
{
IDomNode currentParent = currentBlock.parentNode;
int currentIndex = currentParent.childNodes.indexOf(currentBlock);
if (currentIndex < (currentParent.childNodes.count - 1))
{
//next we'll iterate the next sibling after currentBlock
currentBlock = currentParent.childNodes.itemAt(currentIndex + 1);
break;
}
else
{
//no next sibling after currentBlock
//so iterate next sibling after parent block
currentBlock = currentParent;
continue;
}
}
if (!isBlock(currentBlock))
{
//this can happen if an 'anonymous block' is not the first block of a parent block
//which isn't supported by the current version of the renderer
throw new ApplicationException("unexpected");
}
}
//find the block before the selected block
//into which we'll merge the inline elements
currentBlock = startBlock;
Location previous;
for (; ;)
{
//find the block before the first block
IDomNode parent = currentBlock.parentNode;
int index = parent.childNodes.indexOf(currentBlock);
if (index > 0)
{
//found a previous element
IDomNode previousNode = parent.childNodes.itemAt(index - 1);
if (isBlock(previousNode))
{
//previous element is a block
//but it might have block-level descendents
while ((previousNode.childNodes.count > 0) && isBlock(previousNode.childNodes.itemAt(previousNode.childNodes.count - 1)))
{
previousNode = previousNode.childNodes.itemAt(previousNode.childNodes.count - 1);
}
//want to insert at the end (after the last child) of the previousNode
previous = new Location(previousNode, null);
break;
}
else
{
//previous is not a block,
//so it's an anonymous block
//near the start of a list item or table cell
previous = new Location(parent, previousNode);
break;
}
}
if (parent.nodeName == "body")
{
//startBlock is the first block in the body
//there is no previous block
//so don't merge
return(null);
}
currentBlock = parent;
continue;
}
//search up to find the <body> element
IDomNode body = startBlock;
while (body.nodeName != "body")
{
body = body.parentNode;
}
//remember whether the selection range starts and ends
//in order to restore it after we edit the DOM
OffsetInElement start = new OffsetInElement(body, domRange.startContainer, domRange.startOffset);
OffsetInElement end = new OffsetInElement(body, domRange.endContainer, domRange.endOffset);
return(new ParagraphsToMerge(previous, selected, start, end));
}
void onInsertHyperlink()
{
//get the document fragment which the user has currently selected using mouse and/or cursor
IWindowSelection windowSelection = modelEdit.windowSelection;
//verify that there's only one selection
if (windowSelection.rangeCount != 1)
{
//this can happen when the user has selected several cell in a table,
//in which case each cell is a separate selection/range
MessageBox.Show("Can't insert a hyperlink when more than one range in the document is selected");
return;
}
using (IDomRange domRange = windowSelection.getRangeAt(0))
{
//verify that only one node is selected
if (!domRange.startContainer.isSameNode(domRange.endContainer))
{
//this can happen for example when the selection spans multiple paragraphs
MessageBox.Show("Can't insert a hyperlink when more than one node in the document is selected");
return;
}
IDomNode container = domRange.startContainer; //already just checked that this is the same as domRange.endContainer
//read existing values from the current selection
string url;
string visibleText;
IDomElement existingHyperlink;
switch (container.nodeType)
{
case DomNodeType.Text:
//selection is a text fragment
visibleText = container.nodeValue.Substring(domRange.startOffset, domRange.endOffset - domRange.startOffset);
IDomNode parentNode = container.parentNode;
if ((parentNode.nodeType == DomNodeType.Element) && (parentNode.nodeName == "a"))
{
//parent of this text node is a <a> element
existingHyperlink = parentNode as IDomElement;
url = existingHyperlink.getAttribute("href");
visibleText = container.nodeValue;
if ((existingHyperlink.childNodes.count != 1) || (existingHyperlink.childNodes.itemAt(0).nodeType != DomNodeType.Text))
{
//this can happen when an anchor tag wraps more than just a single, simple text node
//for example when it contains inline elements like <strong>
MessageBox.Show("Can't edit a complex hyperlink");
return;
}
}
else
{
existingHyperlink = null;
url = null;
}
break;
default:
//unexpected
MessageBox.Show("Can't insert a hyperlink when more than one node in the document is selected");
return;
}
//display the modal dialog box
using (FormInsertHyperlink formInsertHyperlink = new FormInsertHyperlink())
{
formInsertHyperlink.url = url;
formInsertHyperlink.visibleText = visibleText;
DialogResult dialogResult = formInsertHyperlink.ShowDialog();
if (dialogResult != DialogResult.OK)
{
//user cancelled
return;
}
//get new values from the dialog box
//the FormInsertHyperlink.onEditTextChanged method assures that both strings are non-empty
url = formInsertHyperlink.url;
visibleText = formInsertHyperlink.visibleText;
}
//need to change href, change text, and possibly delete existing text;
//do this within the scope of a single IEditorTransaction instance so
//that if the user does 'undo' then it will undo all these operations at once, instead of one at a time
using (IEditorTransaction editorTransaction = modelEdit.createEditorTransaction())
{
if (existingHyperlink != null)
{
//changing an existing hyperlink ...
//... change the href attribute value
existingHyperlink.setAttribute("href", url);
//... change the text, by removing the old text node and inserting a new text node
IDomText newDomText = modelEdit.domDocument.createTextNode(visibleText);
IDomNode oldDomText = existingHyperlink.childNodes.itemAt(0);
existingHyperlink.removeChild(oldDomText);
existingHyperlink.insertBefore(newDomText, null);
}
else
{
//creating a new hyperlink
IDomElement newHyperlink = modelEdit.domDocument.createElement("a");
IDomText newDomText = modelEdit.domDocument.createTextNode(visibleText);
newHyperlink.insertBefore(newDomText, null);
newHyperlink.setAttribute("href", url);
//remove whatever was previously selected, if anything
if (!domRange.collapsed)
{
domRange.deleteContents();
}
//insert the new hyperlink
domRange.insertNode(newHyperlink);
}
}
}
}
