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115 lines
4.2 KiB
C++
115 lines
4.2 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 ChangeCSSInlineStyleTxn_h__
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#define ChangeCSSInlineStyleTxn_h__
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#include "EditTxn.h"
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#include "nsCOMPtr.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsID.h"
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#include "nsIDOMElement.h"
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#include "nsString.h"
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#include "nscore.h"
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class nsIAtom;
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class nsIEditor;
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/**
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* A transaction that changes the value of a CSS inline style of a content node.
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* This transaction covers add, remove, and change a property's value.
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*/
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class ChangeCSSInlineStyleTxn : public EditTxn
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{
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public:
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/** Initialize the transaction.
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* @param aEditor [IN] the object providing core editing operations
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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] the new value for aProperty, if aRemoveProperty is false
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* @param aRemoveProperty [IN] if true, remove aProperty from style attribute
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*/
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NS_IMETHOD Init(nsIEditor * aEditor,
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nsIDOMElement * aElement,
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nsIAtom * aProperty,
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const nsAString & aValue,
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bool aRemoveProperty);
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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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* @param aCaseSensitive [IN] a boolean being true if a case-sensitive search is needed
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*/
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static bool ValueIncludes(const nsAString & aValueList, const nsAString & aValue, bool aCaseSensitive);
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/** adds the value aNewValue to the 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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NS_IMETHOD AddValueToMultivalueProperty(nsAString & aValues, const nsAString & aNewValue);
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ChangeCSSInlineStyleTxn();
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private:
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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, 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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public:
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(ChangeCSSInlineStyleTxn, EditTxn)
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NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr);
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NS_DECL_EDITTXN
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NS_IMETHOD RedoTransaction();
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protected:
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/** the editor that created this transaction */
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nsIEditor *mEditor;
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/** the element to operate upon */
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nsCOMPtr<nsIDOMElement> mElement;
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/** the CSS property to change */
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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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/** 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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/** true if the operation is to remove mProperty from mElement */
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bool mRemoveProperty;
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};
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#endif
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