Exemplo n.º 1
0
        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);
                    }
                }
            }
        }