mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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122 lines
3.9 KiB
C++
122 lines
3.9 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 "DeleteTextTxn.h"
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#include "nsIDOMCharacterData.h"
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#include "nsISelection.h"
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#include "nsSelectionState.h"
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#ifdef NS_DEBUG
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static bool gNoisy = false;
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#endif
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DeleteTextTxn::DeleteTextTxn()
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: EditTxn()
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,mEditor(nsnull)
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,mElement()
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,mOffset(0)
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,mNumCharsToDelete(0)
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,mRangeUpdater(nsnull)
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{
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}
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NS_IMPL_CYCLE_COLLECTION_CLASS(DeleteTextTxn)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(DeleteTextTxn, EditTxn)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mElement)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(DeleteTextTxn, EditTxn)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mElement)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DeleteTextTxn)
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NS_INTERFACE_MAP_END_INHERITING(EditTxn)
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NS_IMETHODIMP DeleteTextTxn::Init(nsIEditor *aEditor,
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nsIDOMCharacterData *aElement,
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PRUint32 aOffset,
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PRUint32 aNumCharsToDelete,
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nsRangeUpdater *aRangeUpdater)
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{
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NS_ASSERTION(aEditor&&aElement, "bad arg");
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if (!aEditor || !aElement) { return NS_ERROR_NULL_POINTER; }
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mEditor = aEditor;
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mElement = do_QueryInterface(aElement);
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// do nothing if the node is read-only
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if (!mEditor->IsModifiableNode(mElement)) {
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return NS_ERROR_FAILURE;
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}
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mOffset = aOffset;
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mNumCharsToDelete = aNumCharsToDelete;
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NS_ASSERTION(0!=aNumCharsToDelete, "bad arg, numCharsToDelete");
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PRUint32 count;
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aElement->GetLength(&count);
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NS_ASSERTION(count>=aNumCharsToDelete, "bad arg, numCharsToDelete. Not enough characters in node");
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NS_ASSERTION(count>=aOffset+aNumCharsToDelete, "bad arg, numCharsToDelete. Not enough characters in node");
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mDeletedText.Truncate();
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mRangeUpdater = aRangeUpdater;
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return NS_OK;
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}
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NS_IMETHODIMP DeleteTextTxn::DoTransaction(void)
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{
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#ifdef NS_DEBUG
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if (gNoisy) { printf("Do Delete Text\n"); }
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#endif
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NS_ASSERTION(mEditor && mElement, "bad state");
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if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
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// get the text that we're about to delete
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nsresult result = mElement->SubstringData(mOffset, mNumCharsToDelete, mDeletedText);
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NS_ASSERTION(NS_SUCCEEDED(result), "could not get text to delete.");
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result = mElement->DeleteData(mOffset, mNumCharsToDelete);
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NS_ENSURE_SUCCESS(result, result);
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if (mRangeUpdater)
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mRangeUpdater->SelAdjDeleteText(mElement, mOffset, mNumCharsToDelete);
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// only set selection to deletion 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);
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NS_ASSERTION((NS_SUCCEEDED(result)), "selection could not be collapsed after undo of deletetext.");
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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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//XXX: we may want to store the selection state and restore it properly
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// was it an insertion point or an extended selection?
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NS_IMETHODIMP DeleteTextTxn::UndoTransaction(void)
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{
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#ifdef NS_DEBUG
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if (gNoisy) { printf("Undo Delete Text\n"); }
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#endif
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NS_ASSERTION(mEditor && mElement, "bad state");
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if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
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return mElement->InsertData(mOffset, mDeletedText);
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}
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NS_IMETHODIMP DeleteTextTxn::GetTxnDescription(nsAString& aString)
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{
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aString.AssignLiteral("DeleteTextTxn: ");
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aString += mDeletedText;
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return NS_OK;
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}
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