import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

editor/libeditor/DeleteTextTransaction.h

@@ -0,0 +1,76 @@
+/* -*- 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/. */
+
+#ifndef DeleteTextTransaction_h
+#define DeleteTextTransaction_h
+
+#include "mozilla/EditTransactionBase.h"
+#include "nsCOMPtr.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsGenericDOMDataNode.h"
+#include "nsID.h"
+#include "nsString.h"
+#include "nscore.h"
+
+namespace mozilla {
+
+class EditorBase;
+class RangeUpdater;
+
+/**
+ * A transaction that removes text from a content node.
+ */
+class DeleteTextTransaction final : public EditTransactionBase
+{
+public:
+  /**
+   * Initialize the transaction.
+   * @param aEditorBase         The provider of basic editing operations.
+   * @param aElement            The content node to remove text from.
+   * @param aOffset             The location in aElement to begin the deletion.
+   * @param aNumCharsToDelete   The number of characters to delete.  Not the
+   *                            number of bytes!
+   */
+  DeleteTextTransaction(EditorBase& aEditorBase,
+                        nsGenericDOMDataNode& aCharData,
+                        uint32_t aOffset,
+                        uint32_t aNumCharsToDelete,
+                        RangeUpdater* aRangeUpdater);
+
+  nsresult Init();
+
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(DeleteTextTransaction,
+                                           EditTransactionBase)
+  NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr) override;
+
+  NS_DECL_EDITTRANSACTIONBASE
+
+  uint32_t GetOffset() { return mOffset; }
+
+  uint32_t GetNumCharsToDelete() { return mNumCharsToDelete; }
+
+protected:
+  // The provider of basic editing operations.
+  EditorBase& mEditorBase;
+
+  // The CharacterData node to operate upon.
+  RefPtr<nsGenericDOMDataNode> mCharData;
+
+  // The offset into mCharData where the deletion is to take place.
+  uint32_t mOffset;
+
+  // The number of characters to delete.
+  uint32_t mNumCharsToDelete;
+
+  // The text that was deleted.
+  nsString mDeletedText;
+
+  // Range updater object.
+  RangeUpdater* mRangeUpdater;
+};
+
+} // namespace mozilla
+
+#endif // #ifndef DeleteTextTransaction_h