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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /editor/libeditor/ChangeStyleTransaction.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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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 mozilla_ChangeStyleTransaction_h
+#define mozilla_ChangeStyleTransaction_h
+
+#include "mozilla/EditTransactionBase.h" // base class
+#include "nsCOMPtr.h" // nsCOMPtr members
+#include "nsCycleCollectionParticipant.h" // various macros
+#include "nsString.h" // nsString members
+
+class nsAString;
+class nsIAtom;
+
+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
+{
+public:
+ NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(ChangeStyleTransaction,
+ EditTransactionBase)
+
+ NS_DECL_ISUPPORTS_INHERITED
+
+ NS_DECL_EDITTRANSACTIONBASE
+
+ NS_IMETHOD RedoTransaction() override;
+
+ enum EChangeType { eSet, eRemove };
+
+ /**
+ * @param aNode [IN] the node whose style attribute will be changed
+ * @param aProperty [IN] the name of the property to change
+ * @param aValue [IN] new value for aProperty, or value to remove
+ * @param aChangeType [IN] whether to set or remove
+ */
+ ChangeStyleTransaction(dom::Element& aElement,
+ nsIAtom& aProperty,
+ const nsAString& aValue,
+ EChangeType aChangeType);
+
+ /**
+ * 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 nsAString& aValueList,
+ const nsAString& aValue);
+
+private:
+ virtual ~ChangeStyleTransaction();
+
+ /*
+ * Adds the value aNewValue to list of white-space separated values aValues.
+ *
+ * @param aValues [IN/OUT] a list of wite-space separated values
+ * @param aNewValue [IN] a value this code adds to aValues if it is not
+ * already in
+ */
+ void AddValueToMultivalueProperty(nsAString& aValues,
+ const nsAString& aNewValue);
+
+ /**
+ * Returns true if the property accepts more than one value.
+ *
+ * @param aCSSProperty [IN] the CSS property
+ * @return true if the property accepts more than one value
+ */
+ bool AcceptsMoreThanOneValue(nsIAtom& aCSSProperty);
+
+ /**
+ * Remove a value from a list of white-space separated values.
+ * @param aValues [IN] a list of white-space separated values
+ * @param aRemoveValue [IN] the value to remove from the list
+ */
+ void RemoveValueFromListOfValues(nsAString& aValues,
+ const nsAString& aRemoveValue);
+
+ /**
+ * 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.
+ */
+ nsresult SetStyle(bool aAttributeWasSet, nsAString& aValue);
+
+ // The element to operate upon.
+ nsCOMPtr<dom::Element> mElement;
+
+ // The CSS property to change.
+ nsCOMPtr<nsIAtom> mProperty;
+
+ // The value to set the property to (ignored if mRemoveProperty==true).
+ nsString mValue;
+
+ // true if the operation is to remove mProperty from mElement.
+ bool mRemoveProperty;
+
+ // The value to set the property to for undo.
+ nsString mUndoValue;
+ // The value to set the property to for redo.
+ nsString mRedoValue;
+ // 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 mozilla_ChangeStyleTransaction_h