The Tor Browser: editor/libeditor/text/nsTextEditRulesBidi.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #include "nsAutoPtr.h"

     7 #include "nsCOMPtr.h"

     8 #include "nsDebug.h"

     9 #include "nsError.h"

    10 #include "nsFrameSelection.h"

    11 #include "nsIContent.h"

    12 #include "nsIDOMNode.h"

    13 #include "nsIEditor.h"

    14 #include "nsIPresShell.h"

    15 #include "mozilla/dom/Selection.h"

    16 #include "nsISelectionPrivate.h"

    17 #include "nsISupportsImpl.h"

    18 #include "nsPlaintextEditor.h"

    19 #include "nsPresContext.h"

    20 #include "nsTextEditRules.h"

    21 #include "nscore.h"

    23 using namespace mozilla;

    24 using namespace mozilla::dom;

    26 // Test for distance between caret and text that will be deleted

    27 nsresult

    28 nsTextEditRules::CheckBidiLevelForDeletion(nsISelection         *aSelection,

    29                                            nsIDOMNode           *aSelNode,

    30                                            int32_t               aSelOffset,

    31                                            nsIEditor::EDirection aAction,

    32                                            bool                 *aCancel)

    33 {

    34   NS_ENSURE_ARG_POINTER(aCancel);

    35   *aCancel = false;

    37   nsCOMPtr<nsIPresShell> shell = mEditor->GetPresShell();

    38   NS_ENSURE_TRUE(shell, NS_ERROR_NOT_INITIALIZED);

    40   nsPresContext *context = shell->GetPresContext();

    41   NS_ENSURE_TRUE(context, NS_ERROR_NULL_POINTER);

    43   if (!context->BidiEnabled())

    44     return NS_OK;

    46   nsCOMPtr<nsIContent> content = do_QueryInterface(aSelNode);

    47   NS_ENSURE_TRUE(content, NS_ERROR_NULL_POINTER);

    49   uint8_t levelBefore;

    50   uint8_t levelAfter;

    51   nsRefPtr<nsFrameSelection> frameSelection =

    52     static_cast<Selection*>(aSelection)->GetFrameSelection();

    53   NS_ENSURE_TRUE(frameSelection, NS_ERROR_NULL_POINTER);

    55   nsPrevNextBidiLevels levels = frameSelection->

    56     GetPrevNextBidiLevels(content, aSelOffset, true);

    58   levelBefore = levels.mLevelBefore;

    59   levelAfter = levels.mLevelAfter;

    61   uint8_t currentCaretLevel = frameSelection->GetCaretBidiLevel();

    63   uint8_t levelOfDeletion;

    64   levelOfDeletion =

    65     (nsIEditor::eNext==aAction || nsIEditor::eNextWord==aAction) ?

    66     levelAfter : levelBefore;

    68   if (currentCaretLevel == levelOfDeletion)

    69     ; // perform the deletion

    70   else

    71   {

    72     if (mDeleteBidiImmediately || levelBefore == levelAfter)

    73       ; // perform the deletion

    74     else

    75       *aCancel = true;

    77     // Set the bidi level of the caret to that of the

    78     // character that will be (or would have been) deleted

    79     frameSelection->SetCaretBidiLevel(levelOfDeletion);

    80   }

    81   return NS_OK;

    82 }

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