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+/* -*- 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 ChangeStyleTransaction_h
+#define ChangeStyleTransaction_h
+
+#include "EditTransactionBase.h" // base class
+
+#include "nsCOMPtr.h" // nsCOMPtr members
+#include "nsCycleCollectionParticipant.h" // various macros
+#include "nsString.h" // nsString members
+
+class nsAtom;
+class nsStyledElement;
+
+namespace mozilla {
+
+namespace dom {
+class Element;
+} // namespace dom
+
+/**
+ * A transaction that changes the value of a CSS inline style of a content
+ * node. This transaction covers add, remove, and change a property's value.
+ */
+class ChangeStyleTransaction final : public EditTransactionBase {
+ protected:
+ ChangeStyleTransaction(nsStyledElement& aStyledElement, nsAtom& aProperty,
+ const nsAString& aValue, bool aRemove);
+
+ public:
+ /**
+ * Creates a change style transaction. This never returns nullptr.
+ *
+ * @param aStyledElement The node whose style attribute will be changed.
+ * @param aProperty The name of the property to change.
+ * @param aValue New value for aProperty.
+ */
+ static already_AddRefed<ChangeStyleTransaction> Create(
+ nsStyledElement& aStyledElement, nsAtom& aProperty,
+ const nsAString& aValue);
+
+ /**
+ * Creates a change style transaction. This never returns nullptr.
+ *
+ * @param aStyledElement The node whose style attribute will be changed.
+ * @param aProperty The name of the property to change.
+ * @param aValue The value to remove from aProperty.
+ */
+ static already_AddRefed<ChangeStyleTransaction> CreateToRemove(
+ nsStyledElement& aStyledElement, nsAtom& aProperty,
+ const nsAString& aValue);
+
+ NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(ChangeStyleTransaction,
+ EditTransactionBase)
+
+ NS_DECL_ISUPPORTS_INHERITED
+
+ NS_DECL_EDITTRANSACTIONBASE
+ NS_DECL_EDITTRANSACTIONBASE_GETASMETHODS_OVERRIDE(ChangeStyleTransaction)
+
+ MOZ_CAN_RUN_SCRIPT NS_IMETHOD RedoTransaction() override;
+
+ /**
+ * Returns true if the list of white-space separated values contains aValue
+ *
+ * @param aValueList [IN] a list of white-space separated values
+ * @param aValue [IN] the value to look for in the list
+ * @return true if the value is in the list of values
+ */
+ static bool ValueIncludes(const nsACString& aValueList,
+ const nsACString& aValue);
+
+ friend std::ostream& operator<<(std::ostream& aStream,
+ const ChangeStyleTransaction& aTransaction);
+
+ private:
+ virtual ~ChangeStyleTransaction() = default;
+
+ /**
+ * Build new text-decoration value to set/remove specific values to/from the
+ * rule which already has aCurrentValues.
+ */
+ void BuildTextDecorationValueToSet(const nsACString& aCurrentValues,
+ const nsACString& aAddingValues,
+ nsACString& aOutValues);
+ void BuildTextDecorationValueToRemove(const nsACString& aCurrentValues,
+ const nsACString& aRemovingValues,
+ nsACString& aOutValues);
+
+ /**
+ * Helper method for above methods.
+ */
+ void BuildTextDecorationValue(bool aUnderline, bool aOverline,
+ bool aLineThrough, nsACString& aOutValues);
+
+ /**
+ * If the boolean is true and if the value is not the empty string,
+ * set the property in the transaction to that value; if the value
+ * is empty, remove the property from element's styles. If the boolean
+ * is false, just remove the style attribute.
+ */
+ MOZ_CAN_RUN_SCRIPT nsresult SetStyle(bool aAttributeWasSet,
+ nsACString& aValue);
+
+ // The element to operate upon.
+ RefPtr<nsStyledElement> mStyledElement;
+
+ // The CSS property to change.
+ RefPtr<nsAtom> mProperty;
+
+ // The value to set the property to (ignored if mRemoveProperty==true).
+ nsCString mValue;
+
+ // The value to set the property to for undo.
+ nsCString mUndoValue;
+ // The value to set the property to for redo.
+ nsCString mRedoValue;
+
+ // true if the operation is to remove mProperty from mElement.
+ bool mRemoveProperty;
+
+ // True if the style attribute was present and not empty before DoTransaction.
+ bool mUndoAttributeWasSet;
+ // True if the style attribute is present and not empty after DoTransaction.
+ bool mRedoAttributeWasSet;
+};
+
+} // namespace mozilla
+
+#endif // #ifndef ChangeStyleTransaction_h