editor/libeditor/DeleteRangeTxn.h

   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 #ifndef DeleteRangeTxn_h__
   7 #define DeleteRangeTxn_h__
   8
   9 #include "EditAggregateTxn.h"
  10 #include "EditTxn.h"
  11 #include "nsAutoPtr.h"
  12 #include "nsCycleCollectionParticipant.h"
  13 #include "nsID.h"
  14 #include "nsIEditor.h"
  15 #include "nsISupportsImpl.h"
  16 #include "nsRange.h"
  17 #include "nscore.h"
  18
  19 class nsEditor;
  20 class nsINode;
  21 class nsRangeUpdater;
  22
  23 /**
  24  * A transaction that deletes an entire range in the content tree
  25  */
  26 class DeleteRangeTxn : public EditAggregateTxn
  27 {
  28 public:
  29   /** initialize the transaction.
  30     * @param aEditor the object providing basic editing operations
  31     * @param aRange  the range to delete
  32     */
  33   nsresult Init(nsEditor* aEditor,
  34                 nsRange* aRange,
  35                 nsRangeUpdater* aRangeUpdater);
  36
  37   DeleteRangeTxn();
  38
  39   NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(DeleteRangeTxn, EditAggregateTxn)
  40   NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr);
  41
  42   NS_DECL_EDITTXN
  43
  44   NS_IMETHOD RedoTransaction();
  45
  46   virtual void LastRelease()
  47   {
  48     mRange = nullptr;
  49     EditAggregateTxn::LastRelease();
  50   }
  51 protected:
  52
  53   nsresult CreateTxnsToDeleteBetween(nsINode* aNode,
  54                                      int32_t aStartOffset,
  55                                      int32_t aEndOffset);
  56
  57   nsresult CreateTxnsToDeleteNodesBetween();
  58
  59   nsresult CreateTxnsToDeleteContent(nsINode* aParent,
  60                                      int32_t aOffset,
  61                                      nsIEditor::EDirection aAction);
  62
  63 protected:
  64
  65   /** p1 in the range */
  66   nsRefPtr<nsRange> mRange;
  67
  68   /** the editor for this transaction */
  69   nsEditor* mEditor;
  70
  71   /** range updater object */
  72   nsRangeUpdater* mRangeUpdater;
  73 };
  74
  75 #endif