1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/editor/libeditor/base/InsertTextTxn.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,149 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include <stdio.h> // for printf
1.10 +
1.11 +#include "InsertTextTxn.h"
1.12 +#include "nsAString.h"
1.13 +#include "nsDebug.h" // for NS_ASSERTION, etc
1.14 +#include "nsError.h" // for NS_OK, etc
1.15 +#include "nsIDOMCharacterData.h" // for nsIDOMCharacterData
1.16 +#include "nsIEditor.h" // for nsIEditor
1.17 +#include "nsISelection.h" // for nsISelection
1.18 +#include "nsISupportsUtils.h" // for NS_ADDREF_THIS, NS_RELEASE
1.19 +#include "nsITransaction.h" // for nsITransaction
1.20 +
1.21 +InsertTextTxn::InsertTextTxn()
1.22 + : EditTxn()
1.23 +{
1.24 +}
1.25 +
1.26 +NS_IMPL_CYCLE_COLLECTION_INHERITED(InsertTextTxn, EditTxn,
1.27 + mElement)
1.28 +
1.29 +NS_IMPL_ADDREF_INHERITED(InsertTextTxn, EditTxn)
1.30 +NS_IMPL_RELEASE_INHERITED(InsertTextTxn, EditTxn)
1.31 +NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(InsertTextTxn)
1.32 + if (aIID.Equals(InsertTextTxn::GetCID())) {
1.33 + *aInstancePtr = (void*)(InsertTextTxn*)this;
1.34 + NS_ADDREF_THIS();
1.35 + return NS_OK;
1.36 + } else
1.37 +NS_INTERFACE_MAP_END_INHERITING(EditTxn)
1.38 +
1.39 +NS_IMETHODIMP InsertTextTxn::Init(nsIDOMCharacterData *aElement,
1.40 + uint32_t aOffset,
1.41 + const nsAString &aStringToInsert,
1.42 + nsIEditor *aEditor)
1.43 +{
1.44 +#if 0
1.45 + nsAutoString text;
1.46 + aElement->GetData(text);
1.47 + printf("InsertTextTxn: Offset to insert at = %d. Text of the node to insert into:\n", aOffset);
1.48 + wprintf(text.get());
1.49 + printf("\n");
1.50 +#endif
1.51 +
1.52 + NS_ASSERTION(aElement && aEditor, "bad args");
1.53 + NS_ENSURE_TRUE(aElement && aEditor, NS_ERROR_NULL_POINTER);
1.54 +
1.55 + mElement = do_QueryInterface(aElement);
1.56 + mOffset = aOffset;
1.57 + mStringToInsert = aStringToInsert;
1.58 + mEditor = aEditor;
1.59 + return NS_OK;
1.60 +}
1.61 +
1.62 +NS_IMETHODIMP InsertTextTxn::DoTransaction(void)
1.63 +{
1.64 + NS_ASSERTION(mElement && mEditor, "bad state");
1.65 + if (!mElement || !mEditor) { return NS_ERROR_NOT_INITIALIZED; }
1.66 +
1.67 + nsresult result = mElement->InsertData(mOffset, mStringToInsert);
1.68 + NS_ENSURE_SUCCESS(result, result);
1.69 +
1.70 + // only set selection to insertion point if editor gives permission
1.71 + bool bAdjustSelection;
1.72 + mEditor->ShouldTxnSetSelection(&bAdjustSelection);
1.73 + if (bAdjustSelection)
1.74 + {
1.75 + nsCOMPtr<nsISelection> selection;
1.76 + result = mEditor->GetSelection(getter_AddRefs(selection));
1.77 + NS_ENSURE_SUCCESS(result, result);
1.78 + NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
1.79 + result = selection->Collapse(mElement, mOffset+mStringToInsert.Length());
1.80 + NS_ASSERTION((NS_SUCCEEDED(result)), "selection could not be collapsed after insert.");
1.81 + }
1.82 + else
1.83 + {
1.84 + // do nothing - dom range gravity will adjust selection
1.85 + }
1.86 +
1.87 + return result;
1.88 +}
1.89 +
1.90 +NS_IMETHODIMP InsertTextTxn::UndoTransaction(void)
1.91 +{
1.92 + NS_ASSERTION(mElement && mEditor, "bad state");
1.93 + if (!mElement || !mEditor) { return NS_ERROR_NOT_INITIALIZED; }
1.94 +
1.95 + uint32_t length = mStringToInsert.Length();
1.96 + return mElement->DeleteData(mOffset, length);
1.97 +}
1.98 +
1.99 +NS_IMETHODIMP InsertTextTxn::Merge(nsITransaction *aTransaction, bool *aDidMerge)
1.100 +{
1.101 + // set out param default value
1.102 + if (aDidMerge)
1.103 + *aDidMerge = false;
1.104 + nsresult result = NS_OK;
1.105 + if (aDidMerge && aTransaction)
1.106 + {
1.107 + // if aTransaction is a InsertTextTxn, and if the selection hasn't changed,
1.108 + // then absorb it
1.109 + InsertTextTxn *otherInsTxn = nullptr;
1.110 + aTransaction->QueryInterface(InsertTextTxn::GetCID(), (void **)&otherInsTxn);
1.111 + if (otherInsTxn)
1.112 + {
1.113 + if (IsSequentialInsert(otherInsTxn))
1.114 + {
1.115 + nsAutoString otherData;
1.116 + otherInsTxn->GetData(otherData);
1.117 + mStringToInsert += otherData;
1.118 + *aDidMerge = true;
1.119 + }
1.120 + NS_RELEASE(otherInsTxn);
1.121 + }
1.122 + }
1.123 + return result;
1.124 +}
1.125 +
1.126 +NS_IMETHODIMP InsertTextTxn::GetTxnDescription(nsAString& aString)
1.127 +{
1.128 + aString.AssignLiteral("InsertTextTxn: ");
1.129 + aString += mStringToInsert;
1.130 + return NS_OK;
1.131 +}
1.132 +
1.133 +/* ============ protected methods ================== */
1.134 +
1.135 +NS_IMETHODIMP InsertTextTxn::GetData(nsString& aResult)
1.136 +{
1.137 + aResult = mStringToInsert;
1.138 + return NS_OK;
1.139 +}
1.140 +
1.141 +bool InsertTextTxn::IsSequentialInsert(InsertTextTxn *aOtherTxn)
1.142 +{
1.143 + NS_ASSERTION(aOtherTxn, "null param");
1.144 + if (aOtherTxn && aOtherTxn->mElement == mElement)
1.145 + {
1.146 + // here, we need to compare offsets.
1.147 + int32_t length = mStringToInsert.Length();
1.148 + if (aOtherTxn->mOffset == (mOffset + length))
1.149 + return true;
1.150 + }
1.151 + return false;
1.152 +}
