forked from mirrors/gecko-dev
2c93600238
First, `EditorBase::CreateTransactionForDeleteSelection` returns an instance of `EditAggregateTransaction`. It's a base class of `PlaceholderTransaction` and `DeleteRangeTransaction` but it's also a concrete class. However, it's too generic. Therefore, this patch creates `DeleteMultipleRangesTransaction` which is a simple sub-class of it, and makes `EditAggregateTransaction` be an abstract class. Then, add `AddChild` methods to each concrete class to restrict the type of child transactions. Next, `DeleteRangeTransaction` contains only `DeleteNodeTransaction` and `DeleteTextTransaction`. Therefore, once they have a common base class, we can check the type easier. Therefore, this patch also adds `DeleteContentTransactionBase` and `EditorBase::CreateTransactionForCollapsedRange` becomes clearer what it returns. With these changes, `DeleteRangeTransaction` obviously contains only `DeleteContentTransactionBase`, `DeleteMultipleRangesTransaction` contains only `DeleteRangeTransaction`, `DeleteNodeTransaction` and `DeleteTextTransaction`. And they are guaranteed at build time (at least from outside the classes). *** fix Differential Revision: https://phabricator.services.mozilla.com/D169038
77 lines
2.3 KiB
C++
77 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef DeleteNodeTransaction_h
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#define DeleteNodeTransaction_h
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#include "DeleteContentTransactionBase.h"
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#include "EditorForwards.h"
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#include "nsCOMPtr.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsIContent.h"
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#include "nsINode.h"
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#include "nsISupportsImpl.h"
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#include "nscore.h"
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namespace mozilla {
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/**
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* A transaction that deletes a single element
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*/
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class DeleteNodeTransaction final : public DeleteContentTransactionBase {
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protected:
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DeleteNodeTransaction(EditorBase& aEditorBase, nsIContent& aContentToDelete);
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public:
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/**
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* Creates a delete node transaction instance. This returns nullptr if
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* it cannot remove the node from its parent.
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*
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* @param aEditorBase The editor.
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* @param aContentToDelete The node to be removed from the DOM tree.
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*/
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static already_AddRefed<DeleteNodeTransaction> MaybeCreate(
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EditorBase& aEditorBase, nsIContent& aContentToDelete);
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/**
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* CanDoIt() returns true if there are enough members and can modify the
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* parent. Otherwise, false.
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*/
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bool CanDoIt() const;
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(DeleteNodeTransaction,
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DeleteContentTransactionBase)
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NS_DECL_EDITTRANSACTIONBASE
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NS_DECL_EDITTRANSACTIONBASE_GETASMETHODS_OVERRIDE(DeleteNodeTransaction)
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MOZ_CAN_RUN_SCRIPT NS_IMETHOD RedoTransaction() final;
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EditorDOMPoint SuggestPointToPutCaret() const final;
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nsIContent* GetContent() const { return mContentToDelete; }
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friend std::ostream& operator<<(std::ostream& aStream,
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const DeleteNodeTransaction& aTransaction);
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protected:
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virtual ~DeleteNodeTransaction() = default;
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// The element to delete.
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nsCOMPtr<nsIContent> mContentToDelete;
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// Parent of node to delete.
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nsCOMPtr<nsINode> mParentNode;
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// Next sibling to remember for undo/redo purposes.
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nsCOMPtr<nsIContent> mRefContent;
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};
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} // namespace mozilla
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#endif // #ifndef DeleteNodeTransaction_h
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