зеркало из https://github.com/mozilla/gecko-dev.git
154 строки
4.6 KiB
C++
154 строки
4.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <stdio.h> // for printf
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#include "InsertTextTxn.h"
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#include "nsAString.h"
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#include "nsDebug.h" // for NS_ASSERTION, etc
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#include "nsError.h" // for NS_OK, etc
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#include "nsIDOMCharacterData.h" // for nsIDOMCharacterData
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#include "nsIEditor.h" // for nsIEditor
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#include "nsISelection.h" // for nsISelection
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#include "nsISupportsUtils.h" // for NS_ADDREF_THIS, NS_RELEASE
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#include "nsITransaction.h" // for nsITransaction
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InsertTextTxn::InsertTextTxn()
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: EditTxn()
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{
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}
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InsertTextTxn::~InsertTextTxn()
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{
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}
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NS_IMPL_CYCLE_COLLECTION_INHERITED(InsertTextTxn, EditTxn,
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mElement)
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NS_IMPL_ADDREF_INHERITED(InsertTextTxn, EditTxn)
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NS_IMPL_RELEASE_INHERITED(InsertTextTxn, EditTxn)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(InsertTextTxn)
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if (aIID.Equals(InsertTextTxn::GetCID())) {
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*aInstancePtr = (void*)(InsertTextTxn*)this;
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NS_ADDREF_THIS();
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return NS_OK;
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} else
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NS_INTERFACE_MAP_END_INHERITING(EditTxn)
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NS_IMETHODIMP InsertTextTxn::Init(nsIDOMCharacterData *aElement,
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uint32_t aOffset,
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const nsAString &aStringToInsert,
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nsIEditor *aEditor)
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{
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#if 0
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nsAutoString text;
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aElement->GetData(text);
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printf("InsertTextTxn: Offset to insert at = %d. Text of the node to insert into:\n", aOffset);
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wprintf(text.get());
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printf("\n");
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#endif
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NS_ASSERTION(aElement && aEditor, "bad args");
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NS_ENSURE_TRUE(aElement && aEditor, NS_ERROR_NULL_POINTER);
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mElement = do_QueryInterface(aElement);
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mOffset = aOffset;
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mStringToInsert = aStringToInsert;
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mEditor = aEditor;
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return NS_OK;
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}
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NS_IMETHODIMP InsertTextTxn::DoTransaction(void)
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{
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NS_ASSERTION(mElement && mEditor, "bad state");
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if (!mElement || !mEditor) { return NS_ERROR_NOT_INITIALIZED; }
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nsresult result = mElement->InsertData(mOffset, mStringToInsert);
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NS_ENSURE_SUCCESS(result, result);
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// only set selection to insertion point if editor gives permission
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bool bAdjustSelection;
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mEditor->ShouldTxnSetSelection(&bAdjustSelection);
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if (bAdjustSelection)
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{
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nsCOMPtr<nsISelection> selection;
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result = mEditor->GetSelection(getter_AddRefs(selection));
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NS_ENSURE_SUCCESS(result, result);
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NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
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result = selection->Collapse(mElement, mOffset+mStringToInsert.Length());
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NS_ASSERTION((NS_SUCCEEDED(result)), "selection could not be collapsed after insert.");
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}
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else
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{
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// do nothing - dom range gravity will adjust selection
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}
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return result;
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}
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NS_IMETHODIMP InsertTextTxn::UndoTransaction(void)
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{
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NS_ASSERTION(mElement && mEditor, "bad state");
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if (!mElement || !mEditor) { return NS_ERROR_NOT_INITIALIZED; }
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uint32_t length = mStringToInsert.Length();
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return mElement->DeleteData(mOffset, length);
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}
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NS_IMETHODIMP InsertTextTxn::Merge(nsITransaction *aTransaction, bool *aDidMerge)
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{
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// set out param default value
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if (aDidMerge)
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*aDidMerge = false;
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nsresult result = NS_OK;
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if (aDidMerge && aTransaction)
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{
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// if aTransaction is a InsertTextTxn, and if the selection hasn't changed,
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// then absorb it
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InsertTextTxn *otherInsTxn = nullptr;
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aTransaction->QueryInterface(InsertTextTxn::GetCID(), (void **)&otherInsTxn);
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if (otherInsTxn)
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{
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if (IsSequentialInsert(otherInsTxn))
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{
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nsAutoString otherData;
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otherInsTxn->GetData(otherData);
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mStringToInsert += otherData;
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*aDidMerge = true;
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}
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NS_RELEASE(otherInsTxn);
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}
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}
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return result;
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}
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NS_IMETHODIMP InsertTextTxn::GetTxnDescription(nsAString& aString)
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{
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aString.AssignLiteral("InsertTextTxn: ");
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aString += mStringToInsert;
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return NS_OK;
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}
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/* ============ protected methods ================== */
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NS_IMETHODIMP InsertTextTxn::GetData(nsString& aResult)
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{
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aResult = mStringToInsert;
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return NS_OK;
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}
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bool InsertTextTxn::IsSequentialInsert(InsertTextTxn *aOtherTxn)
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{
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NS_ASSERTION(aOtherTxn, "null param");
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if (aOtherTxn && aOtherTxn->mElement == mElement)
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{
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// here, we need to compare offsets.
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int32_t length = mStringToInsert.Length();
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if (aOtherTxn->mOffset == (mOffset + length))
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return true;
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}
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return false;
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}
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