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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/TextEditRules.h"
#include "mozilla/TextEditor.h"
#include "mozilla/dom/Selection.h"
#include "nsCOMPtr.h"
#include "nsDebug.h"
#include "nsError.h"
#include "nsFrameSelection.h"
#include "nsIContent.h"
#include "nsIDOMNode.h"
#include "nsIEditor.h"
#include "nsIPresShell.h"
#include "nsISupportsImpl.h"
#include "nsPresContext.h"
#include "nscore.h"
namespace mozilla {
using namespace dom;
// Test for distance between caret and text that will be deleted
nsresult
TextEditRules::CheckBidiLevelForDeletion(Selection* aSelection,
nsIDOMNode* aSelNode,
int32_t aSelOffset,
nsIEditor::EDirection aAction,
bool* aCancel)
{
NS_ENSURE_ARG_POINTER(aCancel);
*aCancel = false;
nsCOMPtr<nsIPresShell> shell = mTextEditor->GetPresShell();
NS_ENSURE_TRUE(shell, NS_ERROR_NOT_INITIALIZED);
nsPresContext *context = shell->GetPresContext();
NS_ENSURE_TRUE(context, NS_ERROR_NULL_POINTER);
if (!context->BidiEnabled()) {
return NS_OK;
}
nsCOMPtr<nsIContent> content = do_QueryInterface(aSelNode);
NS_ENSURE_TRUE(content, NS_ERROR_NULL_POINTER);
nsBidiLevel levelBefore;
nsBidiLevel levelAfter;
RefPtr<nsFrameSelection> frameSelection =
aSelection->AsSelection()->GetFrameSelection();
NS_ENSURE_TRUE(frameSelection, NS_ERROR_NULL_POINTER);
nsPrevNextBidiLevels levels = frameSelection->
GetPrevNextBidiLevels(content, aSelOffset, true);
levelBefore = levels.mLevelBefore;
levelAfter = levels.mLevelAfter;
nsBidiLevel currentCaretLevel = frameSelection->GetCaretBidiLevel();
nsBidiLevel levelOfDeletion;
levelOfDeletion =
(nsIEditor::eNext==aAction || nsIEditor::eNextWord==aAction) ?
levelAfter : levelBefore;
if (currentCaretLevel == levelOfDeletion) {
return NS_OK; // perform the deletion
}
if (!mDeleteBidiImmediately && levelBefore != levelAfter) {
*aCancel = true;
}
// Set the bidi level of the caret to that of the
// character that will be (or would have been) deleted
frameSelection->SetCaretBidiLevel(levelOfDeletion);
return NS_OK;
}
void
TextEditRules::UndefineCaretBidiLevel(Selection* aSelection)
{
/**
* After inserting text the caret Bidi level must be set to the level of the
* inserted text.This is difficult, because we cannot know what the level is
* until after the Bidi algorithm is applied to the whole paragraph.
*
* So we set the caret Bidi level to UNDEFINED here, and the caret code will
* set it correctly later
*/
RefPtr<nsFrameSelection> frameSelection = aSelection->GetFrameSelection();
if (frameSelection) {
frameSelection->UndefineCaretBidiLevel();
}
}
} // namespace mozilla
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