michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "nsAutoPtr.h"
michael@0: #include "nsCOMPtr.h"
michael@0: #include "nsDebug.h"
michael@0: #include "nsError.h"
michael@0: #include "nsFrameSelection.h"
michael@0: #include "nsIContent.h"
michael@0: #include "nsIDOMNode.h"
michael@0: #include "nsIEditor.h"
michael@0: #include "nsIPresShell.h"
michael@0: #include "mozilla/dom/Selection.h"
michael@0: #include "nsISelectionPrivate.h"
michael@0: #include "nsISupportsImpl.h"
michael@0: #include "nsPlaintextEditor.h"
michael@0: #include "nsPresContext.h"
michael@0: #include "nsTextEditRules.h"
michael@0: #include "nscore.h"
michael@0: 
michael@0: using namespace mozilla;
michael@0: using namespace mozilla::dom;
michael@0: 
michael@0: // Test for distance between caret and text that will be deleted
michael@0: nsresult
michael@0: nsTextEditRules::CheckBidiLevelForDeletion(nsISelection         *aSelection,
michael@0:                                            nsIDOMNode           *aSelNode, 
michael@0:                                            int32_t               aSelOffset, 
michael@0:                                            nsIEditor::EDirection aAction,
michael@0:                                            bool                 *aCancel)
michael@0: {
michael@0:   NS_ENSURE_ARG_POINTER(aCancel);
michael@0:   *aCancel = false;
michael@0: 
michael@0:   nsCOMPtr<nsIPresShell> shell = mEditor->GetPresShell();
michael@0:   NS_ENSURE_TRUE(shell, NS_ERROR_NOT_INITIALIZED);
michael@0:   
michael@0:   nsPresContext *context = shell->GetPresContext();
michael@0:   NS_ENSURE_TRUE(context, NS_ERROR_NULL_POINTER);
michael@0:   
michael@0:   if (!context->BidiEnabled())
michael@0:     return NS_OK;
michael@0:   
michael@0:   nsCOMPtr<nsIContent> content = do_QueryInterface(aSelNode);
michael@0:   NS_ENSURE_TRUE(content, NS_ERROR_NULL_POINTER);
michael@0: 
michael@0:   uint8_t levelBefore;
michael@0:   uint8_t levelAfter;
michael@0:   nsRefPtr<nsFrameSelection> frameSelection =
michael@0:     static_cast<Selection*>(aSelection)->GetFrameSelection();
michael@0:   NS_ENSURE_TRUE(frameSelection, NS_ERROR_NULL_POINTER);
michael@0:   
michael@0:   nsPrevNextBidiLevels levels = frameSelection->
michael@0:     GetPrevNextBidiLevels(content, aSelOffset, true);
michael@0:     
michael@0:   levelBefore = levels.mLevelBefore;
michael@0:   levelAfter = levels.mLevelAfter;
michael@0: 
michael@0:   uint8_t currentCaretLevel = frameSelection->GetCaretBidiLevel();
michael@0: 
michael@0:   uint8_t levelOfDeletion;
michael@0:   levelOfDeletion =
michael@0:     (nsIEditor::eNext==aAction || nsIEditor::eNextWord==aAction) ?
michael@0:     levelAfter : levelBefore;
michael@0: 
michael@0:   if (currentCaretLevel == levelOfDeletion)
michael@0:     ; // perform the deletion
michael@0:   else
michael@0:   {
michael@0:     if (mDeleteBidiImmediately || levelBefore == levelAfter)
michael@0:       ; // perform the deletion
michael@0:     else
michael@0:       *aCancel = true;
michael@0: 
michael@0:     // Set the bidi level of the caret to that of the
michael@0:     // character that will be (or would have been) deleted
michael@0:     frameSelection->SetCaretBidiLevel(levelOfDeletion);
michael@0:   }
michael@0:   return NS_OK;
michael@0: }
michael@0: