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883849ee32
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convert MOZ_OVERRIDE override
convert MOZ_FINAL final
113 lines
3.9 KiB
C++
113 lines
3.9 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 ChangeStyleTxn_h__
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#define ChangeStyleTxn_h__
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#include "EditTxn.h" // base class
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#include "nsCOMPtr.h" // nsCOMPtr members
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#include "nsCycleCollectionParticipant.h" // various macros
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#include "nsString.h" // nsString members
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class nsAString;
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class nsIAtom;
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namespace mozilla {
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namespace dom {
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class Element;
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/**
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* A transaction that changes the value of a CSS inline style of a content
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* node. This transaction covers add, remove, and change a property's value.
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*/
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class ChangeStyleTxn : public EditTxn
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{
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public:
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(ChangeStyleTxn, EditTxn)
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_EDITTXN
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NS_IMETHOD RedoTransaction() override;
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enum EChangeType { eSet, eRemove };
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/** @param aNode [IN] the node whose style attribute will be changed
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* @param aProperty [IN] the name of the property to change
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* @param aValue [IN] new value for aProperty, or value to remove
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* @param aChangeType [IN] whether to set or remove
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*/
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ChangeStyleTxn(Element& aElement, nsIAtom& aProperty,
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const nsAString& aValue, EChangeType aChangeType);
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/** Returns true if the list of white-space separated values contains aValue
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*
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* @return true if the value is in the list of values
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* @param aValueList [IN] a list of white-space separated values
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* @param aValue [IN] the value to look for in the list
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*/
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static bool ValueIncludes(const nsAString& aValueList,
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const nsAString& aValue);
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private:
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~ChangeStyleTxn();
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/** Adds the value aNewValue to list of white-space separated values aValues
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*
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* @param aValues [IN/OUT] a list of wite-space separated values
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* @param aNewValue [IN] a value this code adds to aValues if it is not already in
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*/
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void AddValueToMultivalueProperty(nsAString& aValues,
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const nsAString& aNewValue);
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/** Returns true if the property accepts more than one value
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*
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* @return true if the property accepts more than one value
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* @param aCSSProperty [IN] the CSS property
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*/
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bool AcceptsMoreThanOneValue(nsIAtom& aCSSProperty);
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/** Remove a value from a list of white-space separated values
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* @param aValues [IN] a list of white-space separated values
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* @param aRemoveValue [IN] the value to remove from the list
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*/
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void RemoveValueFromListOfValues(nsAString& aValues,
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const nsAString& aRemoveValue);
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/** If the boolean is true and if the value is not the empty string,
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* set the property in the transaction to that value; if the value
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* is empty, remove the property from element's styles. If the boolean
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* is false, just remove the style attribute.
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*/
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nsresult SetStyle(bool aAttributeWasSet, nsAString& aValue);
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/** The element to operate upon */
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nsCOMPtr<Element> mElement;
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/** The CSS property to change */
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nsCOMPtr<nsIAtom> mProperty;
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/** The value to set the property to (ignored if mRemoveProperty==true) */
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nsString mValue;
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/** true if the operation is to remove mProperty from mElement */
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bool mRemoveProperty;
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/** The value to set the property to for undo */
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nsString mUndoValue;
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/** The value to set the property to for redo */
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nsString mRedoValue;
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/** True if the style attribute was present and not empty before DoTransaction */
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bool mUndoAttributeWasSet;
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/** True if the style attribute is present and not empty after DoTransaction */
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bool mRedoAttributeWasSet;
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};
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}
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}
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#endif
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