/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- * * The contents of this file are subject to the Netscape Public * License Version 1.1 (the "License"); you may not use this file * except in compliance with the License. You may obtain a copy of * the License at http://www.mozilla.org/NPL/ * * Software distributed under the License is distributed on an "AS * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or * implied. See the License for the specific language governing * rights and limitations under the License. * * The Original Code is mozilla.org code. * * The Initial Developer of the Original Code is Netscape * Communications Corporation. Portions created by Netscape are * Copyright (C) 1998 Netscape Communications Corporation. All * Rights Reserved. * * Contributor(s): */ #include "nsTextEditRules.h" #include "nsCOMPtr.h" #include "nsIDOMNode.h" #include "nsIContent.h" #include "nsIPresShell.h" #include "nsIPresContext.h" #include "nsIFrame.h" // Test for distance between caret and text that will be deleted nsresult nsTextEditRules::CheckBidiLevelForDeletion(nsIDOMNode *aSelNode, PRInt32 aSelOffset, nsIEditor::EDirection aAction, PRBool *aCancel) { NS_ENSURE_ARG_POINTER(aCancel); *aCancel = PR_FALSE; nsresult res = NS_OK; nsCOMPtr shell; res = mEditor->GetPresShell(getter_AddRefs(shell)); if (NS_FAILED(res)) return res; if (!shell) return NS_ERROR_NULL_POINTER; nsCOMPtr context; res = shell->GetPresContext(getter_AddRefs(context)); if (NS_FAILED(res)) return res; if (!context) return NS_ERROR_NULL_POINTER; PRBool bidiEnabled; context->GetBidiEnabled(&bidiEnabled); if (!bidiEnabled) return NS_OK; nsCOMPtr content = do_QueryInterface(aSelNode); if (!content) return NS_ERROR_NULL_POINTER; nsIFrame *primaryFrame; nsIFrame *frameBefore; nsIFrame *frameAfter; PRInt32 frameOffset; res = shell->GetPrimaryFrameFor(content, &primaryFrame); if (NS_FAILED(res)) return res; if (!primaryFrame) return NS_ERROR_NULL_POINTER; res = primaryFrame->GetChildFrameContainingOffset(aSelOffset, PR_FALSE, &frameOffset, &frameBefore); if (NS_FAILED(res)) return res; if (!frameBefore) return NS_ERROR_NULL_POINTER; PRInt32 start, end; PRUint8 currentCursorLevel; PRUint8 levelAfter; PRUint8 levelBefore; PRUint8 levelOfDeletion; nsCOMPtr embeddingLevel = getter_AddRefs(NS_NewAtom("EmbeddingLevel")); nsCOMPtr baseLevel = getter_AddRefs(NS_NewAtom("BaseLevel")); // Get the bidi level of the frame before the caret res = frameBefore->GetBidiProperty(context, embeddingLevel, (void**)&levelBefore,sizeof(PRUint8)); if (NS_FAILED(res)) return res; // If the caret is at the end of the frame, get the bidi level of the // frame after the caret frameBefore->GetOffsets(start, end); if (aSelOffset == end || aSelOffset == -1) { res = primaryFrame->GetChildFrameContainingOffset(aSelOffset, PR_TRUE, &frameOffset, &frameAfter); if (NS_FAILED(res)) return res; if (!frameAfter) return NS_ERROR_NULL_POINTER; if (frameBefore==frameAfter) { // there was no frameAfter, i.e. the caret is at the end of the // document -- use the base paragraph level res = frameBefore->GetBidiProperty(context, baseLevel, (void**)&levelAfter,sizeof(PRUint8)); if (NS_FAILED(res)) return res; } else { res = frameAfter->GetBidiProperty(context, embeddingLevel, (void**)&levelAfter,sizeof(PRUint8)); if (NS_FAILED(res)) return res; } } else { levelAfter = levelBefore; } res = shell->GetCursorBidiLevel(¤tCursorLevel); if (NS_FAILED(res)) return res; levelOfDeletion = (nsIEditor::eNext==aAction) ? levelAfter : levelBefore; if (currentCursorLevel == levelOfDeletion) ; // perform the deletion else { if ((levelBefore==levelAfter) && (levelBefore & 1) == (currentCursorLevel & 1)) ; // perform the deletion else *aCancel = PR_TRUE; // Set the bidi level of the caret to that of the // character that will be (or would have been) deleted res = shell->SetCursorBidiLevel(levelOfDeletion); if (NS_FAILED(res)) return res; } return NS_OK; }