michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include <stdio.h>                      // for printf
michael@0: 
michael@0: #include "InsertElementTxn.h"
michael@0: #include "nsAString.h"
michael@0: #include "nsDebug.h"                    // for NS_ENSURE_TRUE, etc
michael@0: #include "nsError.h"                    // for NS_ERROR_NULL_POINTER, etc
michael@0: #include "nsIContent.h"                 // for nsIContent
michael@0: #include "nsIEditor.h"                  // for nsIEditor
michael@0: #include "nsINode.h"                    // for nsINode
michael@0: #include "nsISelection.h"               // for nsISelection
michael@0: #include "nsMemory.h"                   // for nsMemory
michael@0: #include "nsReadableUtils.h"            // for ToNewCString
michael@0: #include "nsString.h"                   // for nsString
michael@0: 
michael@0: InsertElementTxn::InsertElementTxn()
michael@0:   : EditTxn()
michael@0: {
michael@0: }
michael@0: 
michael@0: NS_IMPL_CYCLE_COLLECTION_INHERITED(InsertElementTxn, EditTxn,
michael@0:                                    mNode,
michael@0:                                    mParent)
michael@0: 
michael@0: NS_IMPL_ADDREF_INHERITED(InsertElementTxn, EditTxn)
michael@0: NS_IMPL_RELEASE_INHERITED(InsertElementTxn, EditTxn)
michael@0: NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(InsertElementTxn)
michael@0: NS_INTERFACE_MAP_END_INHERITING(EditTxn)
michael@0: 
michael@0: NS_IMETHODIMP InsertElementTxn::Init(nsIDOMNode *aNode,
michael@0:                                      nsIDOMNode *aParent,
michael@0:                                      int32_t     aOffset,
michael@0:                                      nsIEditor  *aEditor)
michael@0: {
michael@0:   NS_ASSERTION(aNode && aParent && aEditor, "bad arg");
michael@0:   NS_ENSURE_TRUE(aNode && aParent && aEditor, NS_ERROR_NULL_POINTER);
michael@0: 
michael@0:   mNode = do_QueryInterface(aNode);
michael@0:   mParent = do_QueryInterface(aParent);
michael@0:   mOffset = aOffset;
michael@0:   mEditor = aEditor;
michael@0:   NS_ENSURE_TRUE(mNode && mParent && mEditor, NS_ERROR_INVALID_ARG);
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: 
michael@0: NS_IMETHODIMP InsertElementTxn::DoTransaction(void)
michael@0: {
michael@0:   NS_ENSURE_TRUE(mNode && mParent, NS_ERROR_NOT_INITIALIZED);
michael@0: 
michael@0:   nsCOMPtr<nsINode> parent = do_QueryInterface(mParent);
michael@0:   NS_ENSURE_STATE(parent);
michael@0: 
michael@0:   uint32_t count = parent->GetChildCount();
michael@0:   if (mOffset > int32_t(count) || mOffset == -1) {
michael@0:     // -1 is sentinel value meaning "append at end"
michael@0:     mOffset = count;
michael@0:   }
michael@0: 
michael@0:   nsCOMPtr<nsIContent> refContent = parent->GetChildAt(mOffset);
michael@0:   // note, it's ok for refNode to be null.  that means append
michael@0:   nsCOMPtr<nsIDOMNode> refNode = refContent ? refContent->AsDOMNode() : nullptr;
michael@0: 
michael@0:   mEditor->MarkNodeDirty(mNode);
michael@0: 
michael@0:   nsCOMPtr<nsIDOMNode> resultNode;
michael@0:   nsresult result = mParent->InsertBefore(mNode, refNode, getter_AddRefs(resultNode));
michael@0:   NS_ENSURE_SUCCESS(result, result);
michael@0:   NS_ENSURE_TRUE(resultNode, NS_ERROR_NULL_POINTER);
michael@0: 
michael@0:   // only set selection to insertion point if editor gives permission
michael@0:   bool bAdjustSelection;
michael@0:   mEditor->ShouldTxnSetSelection(&bAdjustSelection);
michael@0:   if (bAdjustSelection)
michael@0:   {
michael@0:     nsCOMPtr<nsISelection> selection;
michael@0:     result = mEditor->GetSelection(getter_AddRefs(selection));
michael@0:     NS_ENSURE_SUCCESS(result, result);
michael@0:     NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
michael@0:     // place the selection just after the inserted element
michael@0:     selection->Collapse(mParent, mOffset+1);
michael@0:   }
michael@0:   else
michael@0:   {
michael@0:     // do nothing - dom range gravity will adjust selection
michael@0:   }
michael@0:   return result;
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP InsertElementTxn::UndoTransaction(void)
michael@0: {
michael@0:   NS_ENSURE_TRUE(mNode && mParent, NS_ERROR_NOT_INITIALIZED);
michael@0: 
michael@0:   nsCOMPtr<nsIDOMNode> resultNode;
michael@0:   return mParent->RemoveChild(mNode, getter_AddRefs(resultNode));
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP InsertElementTxn::GetTxnDescription(nsAString& aString)
michael@0: {
michael@0:   aString.AssignLiteral("InsertElementTxn");
michael@0:   return NS_OK;
michael@0: }