1 files changed, 104 insertions, 0 deletions
diff --git a/editor/libeditor/CompositionTransaction.h b/editor/libeditor/CompositionTransaction.h
new file mode 100644
index 000000000..acb3d8beb
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+++ b/editor/libeditor/CompositionTransaction.h
@@ -0,0 +1,104 @@
+/* -*- 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 CompositionTransaction_h
+#define CompositionTransaction_h
+
+#include "mozilla/EditTransactionBase.h"  // base class
+#include "nsCycleCollectionParticipant.h" // various macros
+#include "nsString.h"                     // mStringToInsert
+
+#define NS_IMETEXTTXN_IID \
+  { 0xb391355d, 0x346c, 0x43d1, \
+    { 0x85, 0xed, 0x9e, 0x65, 0xbe, 0xe7, 0x7e, 0x48 } }
+
+namespace mozilla {
+
+class EditorBase;
+class RangeUpdater;
+class TextRangeArray;
+
+namespace dom {
+class Text;
+} // namespace dom
+
+/**
+ * CompositionTransaction stores all edit for a composition, i.e.,
+ * from compositionstart event to compositionend event.  E.g., inserting a
+ * composition string, modifying the composition string or its IME selection
+ * ranges and commit or cancel the composition.
+ */
+class CompositionTransaction final : public EditTransactionBase
+{
+public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_IMETEXTTXN_IID)
+
+  /**
+   * @param aTextNode           The start node of text content.
+   * @param aOffset             The location in aTextNode to do the insertion.
+   * @param aReplaceLength      The length of text to replace. 0 means not
+   *                            replacing existing text.
+   * @param aTextRangeArray     Clauses and/or caret information. This may be
+   *                            null.
+   * @param aString             The new text to insert.
+   * @param aEditorBase         Used to get and set the selection.
+   * @param aRangeUpdater       The range updater
+   */
+  CompositionTransaction(dom::Text& aTextNode,
+                         uint32_t aOffset, uint32_t aReplaceLength,
+                         TextRangeArray* aTextRangeArray,
+                         const nsAString& aString,
+                         EditorBase& aEditorBase,
+                         RangeUpdater* aRangeUpdater);
+
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(CompositionTransaction,
+                                           EditTransactionBase)
+
+  NS_DECL_ISUPPORTS_INHERITED
+
+  NS_DECL_EDITTRANSACTIONBASE
+
+  NS_IMETHOD Merge(nsITransaction* aTransaction, bool* aDidMerge) override;
+
+  void MarkFixed();
+
+  static nsresult SetIMESelection(EditorBase& aEditorBase,
+                                  dom::Text* aTextNode,
+                                  uint32_t aOffsetInNode,
+                                  uint32_t aLengthOfCompositionString,
+                                  const TextRangeArray* aRanges);
+
+private:
+  ~CompositionTransaction();
+
+  nsresult SetSelectionForRanges();
+
+  // The text element to operate upon.
+  RefPtr<dom::Text> mTextNode;
+
+  // The offsets into mTextNode where the insertion should be placed.
+  uint32_t mOffset;
+
+  uint32_t mReplaceLength;
+
+  // The range list.
+  RefPtr<TextRangeArray> mRanges;
+
+  // The text to insert into mTextNode at mOffset.
+  nsString mStringToInsert;
+
+  // The editor, which is used to get the selection controller.
+  EditorBase& mEditorBase;
+
+  RangeUpdater* mRangeUpdater;
+
+  bool mFixed;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(CompositionTransaction, NS_IMETEXTTXN_IID)
+
+} // namespace mozilla
+
+#endif // #ifndef CompositionTransaction_h