Line data    Source code

       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/. */
       5             : 
       6             : #include "mozilla/TextEditRules.h"
       7             : 
       8             : #include "mozilla/TextEditor.h"
       9             : #include "mozilla/dom/Selection.h"
      10             : #include "nsCOMPtr.h"
      11             : #include "nsDebug.h"
      12             : #include "nsError.h"
      13             : #include "nsFrameSelection.h"
      14             : #include "nsIContent.h"
      15             : #include "nsIDOMNode.h"
      16             : #include "nsIEditor.h"
      17             : #include "nsIPresShell.h"
      18             : #include "nsISupportsImpl.h"
      19             : #include "nsPresContext.h"
      20             : #include "nscore.h"
      21             : 
      22             : namespace mozilla {
      23             : 
      24             : using namespace dom;
      25             : 
      26             : // Test for distance between caret and text that will be deleted
      27             : nsresult
      28           0 : TextEditRules::CheckBidiLevelForDeletion(Selection* aSelection,
      29             :                                          nsIDOMNode* aSelNode,
      30             :                                          int32_t aSelOffset,
      31             :                                          nsIEditor::EDirection aAction,
      32             :                                          bool* aCancel)
      33             : {
      34           0 :   NS_ENSURE_ARG_POINTER(aCancel);
      35           0 :   *aCancel = false;
      36             : 
      37           0 :   nsCOMPtr<nsIPresShell> shell = mTextEditor->GetPresShell();
      38           0 :   NS_ENSURE_TRUE(shell, NS_ERROR_NOT_INITIALIZED);
      39             : 
      40           0 :   nsPresContext *context = shell->GetPresContext();
      41           0 :   NS_ENSURE_TRUE(context, NS_ERROR_NULL_POINTER);
      42             : 
      43           0 :   if (!context->BidiEnabled()) {
      44           0 :     return NS_OK;
      45             :   }
      46             : 
      47           0 :   nsCOMPtr<nsIContent> content = do_QueryInterface(aSelNode);
      48           0 :   NS_ENSURE_TRUE(content, NS_ERROR_NULL_POINTER);
      49             : 
      50             :   nsBidiLevel levelBefore;
      51             :   nsBidiLevel levelAfter;
      52             :   RefPtr<nsFrameSelection> frameSelection =
      53           0 :     aSelection->AsSelection()->GetFrameSelection();
      54           0 :   NS_ENSURE_TRUE(frameSelection, NS_ERROR_NULL_POINTER);
      55             : 
      56             :   nsPrevNextBidiLevels levels = frameSelection->
      57           0 :     GetPrevNextBidiLevels(content, aSelOffset, true);
      58             : 
      59           0 :   levelBefore = levels.mLevelBefore;
      60           0 :   levelAfter = levels.mLevelAfter;
      61             : 
      62           0 :   nsBidiLevel currentCaretLevel = frameSelection->GetCaretBidiLevel();
      63             : 
      64             :   nsBidiLevel levelOfDeletion;
      65           0 :   levelOfDeletion =
      66           0 :     (nsIEditor::eNext==aAction || nsIEditor::eNextWord==aAction) ?
      67             :     levelAfter : levelBefore;
      68             : 
      69           0 :   if (currentCaretLevel == levelOfDeletion) {
      70           0 :     return NS_OK; // perform the deletion
      71             :   }
      72             : 
      73           0 :   if (!mDeleteBidiImmediately && levelBefore != levelAfter) {
      74           0 :     *aCancel = true;
      75             :   }
      76             : 
      77             :   // Set the bidi level of the caret to that of the
      78             :   // character that will be (or would have been) deleted
      79           0 :   frameSelection->SetCaretBidiLevel(levelOfDeletion);
      80           0 :   return NS_OK;
      81             : }
      82             : 
      83             : void
      84           1 : TextEditRules::UndefineCaretBidiLevel(Selection* aSelection)
      85             : {
      86             :   /**
      87             :    * After inserting text the caret Bidi level must be set to the level of the
      88             :    * inserted text.This is difficult, because we cannot know what the level is
      89             :    * until after the Bidi algorithm is applied to the whole paragraph.
      90             :    *
      91             :    * So we set the caret Bidi level to UNDEFINED here, and the caret code will
      92             :    * set it correctly later
      93             :    */
      94           2 :   RefPtr<nsFrameSelection> frameSelection = aSelection->GetFrameSelection();
      95           1 :   if (frameSelection) {
      96           1 :     frameSelection->UndefineCaretBidiLevel();
      97             :   }
      98           1 : }
      99             : 
     100             : } // namespace mozilla