gecko/editor/libeditor/base/nsEditorUtils.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2012-05-21 04:12:37 -07:00
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/Selection.h"
#include "nsCOMArray.h"
#include "nsComponentManagerUtils.h"
#include "nsEditorUtils.h"
#include "nsError.h"
#include "nsIClipboardDragDropHookList.h"
// hooks
#include "nsIClipboardDragDropHooks.h"
#include "nsIContent.h"
#include "nsIContentIterator.h"
#include "nsIDOMDocument.h"
#include "nsIDocShell.h"
#include "nsIDocument.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsINode.h"
#include "nsISimpleEnumerator.h"
class nsIDOMRange;
class nsISupports;
using namespace mozilla;
/******************************************************************************
* nsAutoSelectionReset
*****************************************************************************/
nsAutoSelectionReset::nsAutoSelectionReset(Selection* aSel, nsEditor* aEd)
: mSel(nullptr), mEd(nullptr)
{
if (!aSel || !aEd) return; // not much we can do, bail.
if (aEd->ArePreservingSelection()) return; // we already have initted mSavedSel, so this must be nested call.
mSel = aSel;
mEd = aEd;
if (mSel)
{
mEd->PreserveSelectionAcrossActions(mSel);
}
}
nsAutoSelectionReset::~nsAutoSelectionReset()
{
NS_ASSERTION(!mSel || mEd, "mEd should be non-null when mSel is");
if (mSel && mEd->ArePreservingSelection()) // mSel will be null if this was nested call
{
mEd->RestorePreservedSelection(mSel);
}
}
void
nsAutoSelectionReset::Abort()
{
NS_ASSERTION(!mSel || mEd, "mEd should be non-null when mSel is");
if (mSel)
mEd->StopPreservingSelection();
}
/******************************************************************************
* some helper classes for iterating the dom tree
*****************************************************************************/
nsDOMIterator::nsDOMIterator() :
mIter(nullptr)
{
}
nsDOMIterator::~nsDOMIterator()
{
}
nsresult
nsDOMIterator::Init(nsIDOMRange* aRange)
{
nsresult res;
mIter = do_CreateInstance("@mozilla.org/content/post-content-iterator;1", &res);
NS_ENSURE_SUCCESS(res, res);
NS_ENSURE_TRUE(mIter, NS_ERROR_FAILURE);
return mIter->Init(aRange);
}
nsresult
nsDOMIterator::Init(nsIDOMNode* aNode)
{
nsresult res;
mIter = do_CreateInstance("@mozilla.org/content/post-content-iterator;1", &res);
NS_ENSURE_SUCCESS(res, res);
NS_ENSURE_TRUE(mIter, NS_ERROR_FAILURE);
nsCOMPtr<nsIContent> content = do_QueryInterface(aNode);
return mIter->Init(content);
}
nsresult
nsDOMIterator::AppendList(nsBoolDomIterFunctor& functor,
nsCOMArray<nsIDOMNode>& arrayOfNodes) const
{
nsCOMPtr<nsIDOMNode> node;
// iterate through dom and build list
while (!mIter->IsDone())
{
node = do_QueryInterface(mIter->GetCurrentNode());
NS_ENSURE_TRUE(node, NS_ERROR_NULL_POINTER);
if (functor(node))
{
arrayOfNodes.AppendObject(node);
}
mIter->Next();
}
return NS_OK;
}
nsDOMSubtreeIterator::nsDOMSubtreeIterator()
{
}
nsDOMSubtreeIterator::~nsDOMSubtreeIterator()
{
}
nsresult
nsDOMSubtreeIterator::Init(nsIDOMRange* aRange)
{
nsresult res;
mIter = do_CreateInstance("@mozilla.org/content/subtree-content-iterator;1", &res);
NS_ENSURE_SUCCESS(res, res);
NS_ENSURE_TRUE(mIter, NS_ERROR_FAILURE);
return mIter->Init(aRange);
}
/******************************************************************************
* some general purpose editor utils
*****************************************************************************/
bool
nsEditorUtils::IsDescendantOf(nsIDOMNode *aNode, nsIDOMNode *aParent, int32_t *aOffset)
{
NS_ENSURE_TRUE(aNode || aParent, false);
if (aNode == aParent) return false;
nsCOMPtr<nsIDOMNode> parent, node = do_QueryInterface(aNode);
nsresult res;
do
{
res = node->GetParentNode(getter_AddRefs(parent));
NS_ENSURE_SUCCESS(res, false);
if (parent == aParent)
{
if (aOffset)
{
nsCOMPtr<nsIContent> pCon(do_QueryInterface(parent));
nsCOMPtr<nsIContent> cCon(do_QueryInterface(node));
if (pCon)
{
*aOffset = pCon->IndexOf(cCon);
}
}
return true;
}
node = parent;
} while (parent);
return false;
}
bool
nsEditorUtils::IsLeafNode(nsIDOMNode *aNode)
{
bool hasChildren = false;
if (aNode)
aNode->HasChildNodes(&hasChildren);
return !hasChildren;
}
/******************************************************************************
* utility methods for drag/drop/copy/paste hooks
*****************************************************************************/
nsresult
nsEditorHookUtils::GetHookEnumeratorFromDocument(nsIDOMDocument *aDoc,
nsISimpleEnumerator **aResult)
{
nsCOMPtr<nsIDocument> doc = do_QueryInterface(aDoc);
NS_ENSURE_TRUE(doc, NS_ERROR_FAILURE);
nsCOMPtr<nsISupports> container = doc->GetContainer();
nsCOMPtr<nsIDocShell> docShell = do_QueryInterface(container);
nsCOMPtr<nsIClipboardDragDropHookList> hookObj = do_GetInterface(docShell);
NS_ENSURE_TRUE(hookObj, NS_ERROR_FAILURE);
return hookObj->GetHookEnumerator(aResult);
}
bool
nsEditorHookUtils::DoInsertionHook(nsIDOMDocument *aDoc, nsIDOMEvent *aDropEvent,
nsITransferable *aTrans)
{
nsCOMPtr<nsISimpleEnumerator> enumerator;
GetHookEnumeratorFromDocument(aDoc, getter_AddRefs(enumerator));
NS_ENSURE_TRUE(enumerator, true);
bool hasMoreHooks = false;
while (NS_SUCCEEDED(enumerator->HasMoreElements(&hasMoreHooks)) && hasMoreHooks)
{
nsCOMPtr<nsISupports> isupp;
if (NS_FAILED(enumerator->GetNext(getter_AddRefs(isupp))))
break;
nsCOMPtr<nsIClipboardDragDropHooks> override = do_QueryInterface(isupp);
if (override)
{
bool doInsert = true;
#ifdef DEBUG
nsresult hookResult =
#endif
override->OnPasteOrDrop(aDropEvent, aTrans, &doInsert);
NS_ASSERTION(NS_SUCCEEDED(hookResult), "hook failure in OnPasteOrDrop");
NS_ENSURE_TRUE(doInsert, false);
}
}
return true;
}