import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

editor/libeditor/TextEditRulesBidi.cpp

@@ -0,0 +1,100 @@
+/* -*- 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