editor/libeditor/base/DeleteTextTxn.cpp@6474c204b198 (annotated)
editor/libeditor/base/DeleteTextTxn.cpp
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | #include "DeleteTextTxn.h" |
| michael@0 | 7 | #include "mozilla/Assertions.h" |
| michael@0 | 8 | #include "mozilla/dom/Selection.h" |
| michael@0 | 9 | #include "nsAutoPtr.h" |
| michael@0 | 10 | #include "nsDebug.h" |
| michael@0 | 11 | #include "nsEditor.h" |
| michael@0 | 12 | #include "nsError.h" |
| michael@0 | 13 | #include "nsIEditor.h" |
| michael@0 | 14 | #include "nsISelection.h" |
| michael@0 | 15 | #include "nsISupportsImpl.h" |
| michael@0 | 16 | #include "nsSelectionState.h" |
| michael@0 | 17 | #include "nsAString.h" |
| michael@0 | 18 | |
| michael@0 | 19 | using namespace mozilla; |
| michael@0 | 20 | using namespace mozilla::dom; |
| michael@0 | 21 | |
| michael@0 | 22 | DeleteTextTxn::DeleteTextTxn() : |
| michael@0 | 23 | EditTxn(), |
| michael@0 | 24 | mEditor(nullptr), |
| michael@0 | 25 | mCharData(), |
| michael@0 | 26 | mOffset(0), |
| michael@0 | 27 | mNumCharsToDelete(0), |
| michael@0 | 28 | mRangeUpdater(nullptr) |
| michael@0 | 29 | { |
| michael@0 | 30 | } |
| michael@0 | 31 | |
| michael@0 | 32 | NS_IMPL_CYCLE_COLLECTION_INHERITED(DeleteTextTxn, EditTxn, |
| michael@0 | 33 | mCharData) |
| michael@0 | 34 | |
| michael@0 | 35 | NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DeleteTextTxn) |
| michael@0 | 36 | NS_INTERFACE_MAP_END_INHERITING(EditTxn) |
| michael@0 | 37 | |
| michael@0 | 38 | NS_IMETHODIMP |
| michael@0 | 39 | DeleteTextTxn::Init(nsEditor* aEditor, |
| michael@0 | 40 | nsIDOMCharacterData* aCharData, |
| michael@0 | 41 | uint32_t aOffset, |
| michael@0 | 42 | uint32_t aNumCharsToDelete, |
| michael@0 | 43 | nsRangeUpdater* aRangeUpdater) |
| michael@0 | 44 | { |
| michael@0 | 45 | MOZ_ASSERT(aEditor && aCharData); |
| michael@0 | 46 | |
| michael@0 | 47 | mEditor = aEditor; |
| michael@0 | 48 | mCharData = aCharData; |
| michael@0 | 49 | |
| michael@0 | 50 | // do nothing if the node is read-only |
| michael@0 | 51 | if (!mEditor->IsModifiableNode(mCharData)) { |
| michael@0 | 52 | return NS_ERROR_FAILURE; |
| michael@0 | 53 | } |
| michael@0 | 54 | |
| michael@0 | 55 | mOffset = aOffset; |
| michael@0 | 56 | mNumCharsToDelete = aNumCharsToDelete; |
| michael@0 | 57 | #ifdef DEBUG |
| michael@0 | 58 | uint32_t length; |
| michael@0 | 59 | mCharData->GetLength(&length); |
| michael@0 | 60 | NS_ASSERTION(length >= aOffset + aNumCharsToDelete, |
| michael@0 | 61 | "Trying to delete more characters than in node"); |
| michael@0 | 62 | #endif |
| michael@0 | 63 | mDeletedText.Truncate(); |
| michael@0 | 64 | mRangeUpdater = aRangeUpdater; |
| michael@0 | 65 | return NS_OK; |
| michael@0 | 66 | } |
| michael@0 | 67 | |
| michael@0 | 68 | NS_IMETHODIMP |
| michael@0 | 69 | DeleteTextTxn::DoTransaction() |
| michael@0 | 70 | { |
| michael@0 | 71 | MOZ_ASSERT(mEditor && mCharData); |
| michael@0 | 72 | |
| michael@0 | 73 | // get the text that we're about to delete |
| michael@0 | 74 | nsresult res = mCharData->SubstringData(mOffset, mNumCharsToDelete, |
| michael@0 | 75 | mDeletedText); |
| michael@0 | 76 | MOZ_ASSERT(NS_SUCCEEDED(res)); |
| michael@0 | 77 | res = mCharData->DeleteData(mOffset, mNumCharsToDelete); |
| michael@0 | 78 | NS_ENSURE_SUCCESS(res, res); |
| michael@0 | 79 | |
| michael@0 | 80 | if (mRangeUpdater) { |
| michael@0 | 81 | mRangeUpdater->SelAdjDeleteText(mCharData, mOffset, mNumCharsToDelete); |
| michael@0 | 82 | } |
| michael@0 | 83 | |
| michael@0 | 84 | // only set selection to deletion point if editor gives permission |
| michael@0 | 85 | bool bAdjustSelection; |
| michael@0 | 86 | mEditor->ShouldTxnSetSelection(&bAdjustSelection); |
| michael@0 | 87 | if (bAdjustSelection) { |
| michael@0 | 88 | nsRefPtr<Selection> selection = mEditor->GetSelection(); |
| michael@0 | 89 | NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER); |
| michael@0 | 90 | res = selection->Collapse(mCharData, mOffset); |
| michael@0 | 91 | NS_ASSERTION(NS_SUCCEEDED(res), |
| michael@0 | 92 | "selection could not be collapsed after undo of deletetext."); |
| michael@0 | 93 | NS_ENSURE_SUCCESS(res, res); |
| michael@0 | 94 | } |
| michael@0 | 95 | // else do nothing - dom range gravity will adjust selection |
| michael@0 | 96 | return NS_OK; |
| michael@0 | 97 | } |
| michael@0 | 98 | |
| michael@0 | 99 | //XXX: we may want to store the selection state and restore it properly |
| michael@0 | 100 | // was it an insertion point or an extended selection? |
| michael@0 | 101 | NS_IMETHODIMP |
| michael@0 | 102 | DeleteTextTxn::UndoTransaction() |
| michael@0 | 103 | { |
| michael@0 | 104 | MOZ_ASSERT(mEditor && mCharData); |
| michael@0 | 105 | |
| michael@0 | 106 | return mCharData->InsertData(mOffset, mDeletedText); |
| michael@0 | 107 | } |
| michael@0 | 108 | |
| michael@0 | 109 | NS_IMETHODIMP |
| michael@0 | 110 | DeleteTextTxn::GetTxnDescription(nsAString& aString) |
| michael@0 | 111 | { |
| michael@0 | 112 | aString.AssignLiteral("DeleteTextTxn: "); |
| michael@0 | 113 | aString += mDeletedText; |
| michael@0 | 114 | return NS_OK; |
| michael@0 | 115 | } |
