gecko-dev/editor/libeditor/base/ChangeCSSInlineStyleTxn.h

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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 ChangeCSSInlineStyleTxn_h__
#define ChangeCSSInlineStyleTxn_h__
#include "EditTxn.h"
#include "nsCOMPtr.h"
#include "nsCycleCollectionParticipant.h"
#include "nsID.h"
#include "nsIDOMElement.h"
#include "nsString.h"
#include "nscore.h"
class nsIAtom;
class nsIEditor;
/**
* 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 ChangeCSSInlineStyleTxn : public EditTxn
{
public:
/** Initialize the transaction.
* @param aEditor [IN] the object providing core editing operations
* @param aNode [IN] the node whose style attribute will be changed
* @param aProperty [IN] the name of the property to change
* @param aValue [IN] the new value for aProperty, if aRemoveProperty is false
* @param aRemoveProperty [IN] if true, remove aProperty from style attribute
*/
NS_IMETHOD Init(nsIEditor * aEditor,
nsIDOMElement * aElement,
nsIAtom * aProperty,
const nsAString & aValue,
bool aRemoveProperty);
/** returns true if the list of white-space separated values contains aValue
*
* @return true if the value is in the list of values
* @param aValueList [IN] a list of white-space separated values
* @param aValue [IN] the value to look for in the list
* @param aCaseSensitive [IN] a boolean being true if a case-sensitive search is needed
*/
static bool ValueIncludes(const nsAString & aValueList, const nsAString & aValue, bool aCaseSensitive);
/** adds the value aNewValue to the 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
*/
NS_IMETHOD AddValueToMultivalueProperty(nsAString & aValues, const nsAString & aNewValue);
ChangeCSSInlineStyleTxn();
private:
/** returns true if the property accepts more than one value
*
* @return true if the property accepts more than one value
* @param aCSSProperty [IN] the CSS property
*/
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);
public:
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(ChangeCSSInlineStyleTxn, EditTxn)
NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr);
NS_DECL_EDITTXN
NS_IMETHOD RedoTransaction();
protected:
/** the editor that created this transaction */
nsIEditor *mEditor;
/** the element to operate upon */
nsCOMPtr<nsIDOMElement> mElement;
/** the CSS property to change */
nsIAtom *mProperty;
/** the value to set the property to (ignored if mRemoveProperty==true) */
nsString mValue;
/** 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;
/** true if the operation is to remove mProperty from mElement */
bool mRemoveProperty;
};
#endif