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gecko/editor/libeditor/html/nsHTMLCSSUtils.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 nsHTMLCSSUtils_h__
#define nsHTMLCSSUtils_h__
#include "nsCOMPtr.h" // for already_AddRefed
#include "nsTArray.h" // for nsTArray
#include "nscore.h" // for nsAString, nsresult, nsnull
#include "prtypes.h" // for PRUint8, PRInt32, PRUint32
class ChangeCSSInlineStyleTxn;
class nsComputedDOMStyle;
class nsIAtom;
class nsIContent;
class nsIDOMCSSStyleDeclaration;
class nsIDOMElement;
class nsIDOMNode;
class nsINode;
class nsString;
namespace mozilla {
namespace dom {
class Element;
} // namespace dom
} // namespace mozilla
class nsHTMLEditor;
class nsIDOMWindow;
typedef void (*nsProcessValueFunc)(const nsAString * aInputString, nsAString & aOutputString,
const char * aDefaultValueString,
const char * aPrependString, const char* aAppendString);
class nsHTMLCSSUtils
{
public:
explicit nsHTMLCSSUtils(nsHTMLEditor* aEditor);
~nsHTMLCSSUtils();
enum nsCSSEditableProperty {
eCSSEditableProperty_NONE=0,
eCSSEditableProperty_background_color,
eCSSEditableProperty_background_image,
eCSSEditableProperty_border,
eCSSEditableProperty_caption_side,
eCSSEditableProperty_color,
eCSSEditableProperty_float,
eCSSEditableProperty_font_family,
eCSSEditableProperty_font_size,
eCSSEditableProperty_font_style,
eCSSEditableProperty_font_weight,
eCSSEditableProperty_height,
eCSSEditableProperty_list_style_type,
eCSSEditableProperty_margin_left,
eCSSEditableProperty_margin_right,
eCSSEditableProperty_text_align,
eCSSEditableProperty_text_decoration,
eCSSEditableProperty_vertical_align,
eCSSEditableProperty_whitespace,
eCSSEditableProperty_width
};
enum StyleType { eSpecified, eComputed };
struct CSSEquivTable {
nsCSSEditableProperty cssProperty;
nsProcessValueFunc processValueFunctor;
const char * defaultValue;
const char * prependValue;
const char * appendValue;
bool gettable;
bool caseSensitiveValue;
};
/** answers true if the given combination element_name/attribute_name
* has a CSS equivalence in this implementation
*
* @return a boolean saying if the tag/attribute has a css equiv
* @param aNode [IN] a DOM node
* @param aProperty [IN] an atom containing a HTML tag name
* @param aAttribute [IN] a string containing the name of a HTML
* attribute carried by the element above
* @param aValue [IN] an optional string containing the attribute's
* HTML value -- this matters for <font size>,
* since size=7 has no CSS equivalent. Make sure
* you pass the HTML value (e.g. "4"), not the
* CSS value (e.g. "large").
*/
bool IsCSSEditableProperty(nsIContent* aNode, nsIAtom* aProperty,
const nsAString* aAttribute,
const nsAString* aValue = nsnull);
bool IsCSSEditableProperty(nsIDOMNode* aNode, nsIAtom* aProperty,
const nsAString* aAttribute,
const nsAString* aValue = nsnull);
/** adds/remove a CSS declaration to the STYLE atrribute carried by a given element
*
* @param aElement [IN] a DOM element
* @param aProperty [IN] an atom containing the CSS property to set
* @param aValue [IN] a string containing the value of the CSS property
* @param aSuppressTransaction [IN] a boolean indicating, when true,
* that no transaction should be recorded
*/
nsresult SetCSSProperty(nsIDOMElement * aElement, nsIAtom * aProperty,
const nsAString & aValue,
bool aSuppressTransaction);
nsresult SetCSSPropertyPixels(nsIDOMElement *aElement, nsIAtom *aProperty,
PRInt32 aIntValue, bool aSuppressTxn);
nsresult RemoveCSSProperty(nsIDOMElement * aElement, nsIAtom * aProperty,
const nsAString & aPropertyValue, bool aSuppressTransaction);
/** directly adds/remove a CSS declaration to the STYLE atrribute carried by
* a given element without going through the txn manager
*
* @param aElement [IN] a DOM element
* @param aProperty [IN] a string containing the CSS property to set/remove
* @param aValue [IN] a string containing the new value of the CSS property
*/
nsresult SetCSSProperty(nsIDOMElement * aElement,
const nsAString & aProperty,
const nsAString & aValue);
nsresult SetCSSPropertyPixels(nsIDOMElement * aElement,
const nsAString & aProperty,
PRInt32 aIntValue);
/** gets the specified/computed style value of a CSS property for a given node (or its element
* ancestor if it is not an element)
*
* @param aNode [IN] a DOM node
* @param aProperty [IN] an atom containing the CSS property to get
* @param aPropertyValue [OUT] the retrieved value of the property
*/
nsresult GetSpecifiedProperty(nsIDOMNode *aNode, nsIAtom *aProperty,
nsAString & aValue);
nsresult GetComputedProperty(nsIDOMNode *aNode, nsIAtom *aProperty,
nsAString & aValue);
/** Removes a CSS property from the specified declarations in STYLE attribute
** and removes the node if it is an useless span
*
* @param aNode [IN] the specific node we want to remove a style from
* @param aProperty [IN] the CSS property atom to remove
* @param aPropertyValue [IN] the value of the property we have to rremove if the property
* accepts more than one value
*/
nsresult RemoveCSSInlineStyle(nsIDOMNode * aNode, nsIAtom * aProperty, const nsAString & aPropertyValue);
/** Answers true is the property can be removed by setting a "none" CSS value
* on a node
*
* @return a boolean saying if the property can be remove by setting a "none" value
* @param aProperty [IN] an atom containing a CSS property
* @param aAttribute [IN] pointer to an attribute name or null if this information is irrelevant
*/
bool IsCSSInvertable(nsIAtom * aProperty, const nsAString * aAttribute);
/** Get the default browser background color if we need it for GetCSSBackgroundColorState
*
* @param aColor [OUT] the default color as it is defined in prefs
*/
void GetDefaultBackgroundColor(nsAString & aColor);
/** Get the default length unit used for CSS Indent/Outdent
*
* @param aLengthUnit [OUT] the default length unit as it is defined in prefs
*/
void GetDefaultLengthUnit(nsAString & aLengthUnit);
/** returns the list of values for the CSS equivalences to
* the passed HTML style for the passed node
*
* @param aNode [IN] a DOM node
* @param aHTMLProperty [IN] an atom containing an HTML property
* @param aAttribute [IN] a pointer to an attribute name or nsnull if irrelevant
* @param aValueString [OUT] the list of css values
* @param aStyleType [IN] eSpecified or eComputed
*/
nsresult GetCSSEquivalentToHTMLInlineStyleSet(nsINode* aNode,
nsIAtom * aHTMLProperty,
const nsAString * aAttribute,
nsAString & aValueString,
StyleType aStyleType);
/** Does the node aNode (or his parent if it is not an element node) carries
* the CSS equivalent styles to the HTML style for this node ?
*
* @param aNode [IN] a DOM node
* @param aHTMLProperty [IN] an atom containing an HTML property
* @param aAttribute [IN] a pointer to an attribute name or nsnull if irrelevant
* @param aIsSet [OUT] a boolean being true if the css properties are set
* @param aValueString [IN/OUT] the attribute value (in) the list of css values (out)
* @param aStyleType [IN] eSpecified or eComputed
*
* The nsIContent variant returns aIsSet instead of using an out parameter.
*/
bool IsCSSEquivalentToHTMLInlineStyleSet(nsIContent* aContent,
nsIAtom* aProperty,
const nsAString* aAttribute,
const nsAString& aValue,
StyleType aStyleType);
nsresult IsCSSEquivalentToHTMLInlineStyleSet(nsIDOMNode * aNode,
nsIAtom * aHTMLProperty,
const nsAString * aAttribute,
bool & aIsSet,
nsAString & aValueString,
StyleType aStyleType);
/** Adds to the node the CSS inline styles equivalent to the HTML style
* and return the number of CSS properties set by the call
*
* @param aNode [IN] a DOM node
* @param aHTMLProperty [IN] an atom containing an HTML property
* @param aAttribute [IN] a pointer to an attribute name or nsnull if irrelevant
* @param aValue [IN] the attribute value
* @param aCount [OUT] the number of CSS properties set by the call
* @param aSuppressTransaction [IN] a boolean indicating, when true,
* that no transaction should be recorded
*
* aCount is returned by the dom::Element variant instead of being an out
* parameter.
*/
PRInt32 SetCSSEquivalentToHTMLStyle(mozilla::dom::Element* aElement,
nsIAtom* aProperty,
const nsAString* aAttribute,
const nsAString* aValue,
bool aSuppressTransaction);
nsresult SetCSSEquivalentToHTMLStyle(nsIDOMNode * aNode,
nsIAtom * aHTMLProperty,
const nsAString * aAttribute,
const nsAString * aValue,
PRInt32 * aCount,
bool aSuppressTransaction);
/** removes from the node the CSS inline styles equivalent to the HTML style
*
* @param aNode [IN] a DOM node
* @param aHTMLProperty [IN] an atom containing an HTML property
* @param aAttribute [IN] a pointer to an attribute name or nsnull if irrelevant
* @param aValue [IN] the attribute value
* @param aSuppressTransaction [IN] a boolean indicating, when true,
* that no transaction should be recorded
*/
nsresult RemoveCSSEquivalentToHTMLStyle(nsIDOMNode * aNode,
nsIAtom *aHTMLProperty,
const nsAString *aAttribute,
const nsAString *aValue,
bool aSuppressTransaction);
/** parses a "xxxx.xxxxxuuu" string where x is a digit and u an alpha char
* we need such a parser because nsIDOMCSSStyleDeclaration::GetPropertyCSSValue() is not
* implemented
*
* @param aString [IN] input string to parse
* @param aValue [OUT] numeric part
* @param aUnit [OUT] unit part
*/
void ParseLength(const nsAString & aString, float * aValue, nsIAtom ** aUnit);
/** sets the mIsCSSPrefChecked private member ; used as callback from observer when
* the css pref state is changed
*
* @param aIsCSSPrefChecked [IN] the new boolean state for the pref
*/
void SetCSSEnabled(bool aIsCSSPrefChecked);
/** retrieves the mIsCSSPrefChecked private member, true if the css pref is checked,
* false if it is not
*
* @return the boolean value of the css pref
*/
bool IsCSSPrefChecked();
/** ElementsSameStyle compares two elements and checks if they have the same
* specified CSS declarations in the STYLE attribute
* The answer is always false if at least one of them carries an ID or a class
*
* @return true if the two elements are considered to have same styles
* @param aFirstNode [IN] a DOM node
* @param aSecondNode [IN] a DOM node
*/
bool ElementsSameStyle(mozilla::dom::Element* aFirstNode,
mozilla::dom::Element* aSecondNode);
bool ElementsSameStyle(nsIDOMNode *aFirstNode, nsIDOMNode *aSecondNode);
/** get the specified inline styles (style attribute) for an element
*
* @param aElement [IN] the element node
* @param aCssDecl [OUT] the CSS declaration corresponding to the style attr
* @param aLength [OUT] the number of declarations in aCssDecl
*/
nsresult GetInlineStyles(nsIDOMElement * aElement, nsIDOMCSSStyleDeclaration ** aCssDecl,
PRUint32 * aLength);
/** returns aNode itself if it is an element node, or the first ancestors being an element
* node if aNode is not one itself
*
* @param aNode [IN] a node
* @param aElement [OUT] the deepest element node containing aNode (possibly aNode itself)
*/
mozilla::dom::Element* GetElementContainerOrSelf(nsINode* aNode);
already_AddRefed<nsIDOMElement> GetElementContainerOrSelf(nsIDOMNode* aNode);
/**
* Gets the computed style for a given element. Can return null.
*/
already_AddRefed<nsComputedDOMStyle>
GetComputedStyle(nsIDOMElement* aElement);
already_AddRefed<nsComputedDOMStyle>
GetComputedStyle(mozilla::dom::Element* aElement);
private:
/** retrieves the css property atom from an enum
*
* @param aProperty [IN] the enum value for the property
* @param aAtom [OUT] the corresponding atom
*/
void GetCSSPropertyAtom(nsCSSEditableProperty aProperty, nsIAtom ** aAtom);
/** retrieves the CSS declarations equivalent to a HTML style value for
* a given equivalence table
*
* @param aPropertyArray [OUT] the array of css properties
* @param aValueArray [OUT] the array of values for the css properties above
* @param aEquivTable [IN] the equivalence table
* @param aValue [IN] the HTML style value
* @param aGetOrRemoveRequest [IN] a boolean value being true if the call to the current method
* is made for GetCSSEquivalentToHTMLInlineStyleSet or
* RemoveCSSEquivalentToHTMLInlineStyleSet
*/
void BuildCSSDeclarations(nsTArray<nsIAtom*> & aPropertyArray,
nsTArray<nsString> & cssValueArray,
const CSSEquivTable * aEquivTable,
const nsAString * aValue,
bool aGetOrRemoveRequest);
/** retrieves the CSS declarations equivalent to the given HTML property/attribute/value
* for a given node
*
* @param aNode [IN] the DOM node
* @param aHTMLProperty [IN] an atom containing an HTML property
* @param aAttribute [IN] a pointer to an attribute name or nsnull if irrelevant
* @param aValue [IN] the attribute value
* @param aPropertyArray [OUT] the array of css properties
* @param aValueArray [OUT] the array of values for the css properties above
* @param aGetOrRemoveRequest [IN] a boolean value being true if the call to the current method
* is made for GetCSSEquivalentToHTMLInlineStyleSet or
* RemoveCSSEquivalentToHTMLInlineStyleSet
*/
void GenerateCSSDeclarationsFromHTMLStyle(mozilla::dom::Element* aNode,
nsIAtom* aHTMLProperty,
const nsAString* aAttribute,
const nsAString* aValue,
nsTArray<nsIAtom*>& aPropertyArray,
nsTArray<nsString>& aValueArray,
bool aGetOrRemoveRequest);
/** creates a Transaction for setting or removing a css property
*
* @param aElement [IN] a DOM element
* @param aProperty [IN] a CSS property
* @param aValue [IN] the value to remove for this CSS property or the empty string if irrelevant
* @param aTxn [OUT] the created transaction
* @param aRemoveProperty [IN] true if we create a "remove" transaction, false for a "set"
*/
nsresult CreateCSSPropertyTxn(nsIDOMElement * aElement,
nsIAtom * aProperty,
const nsAString & aValue,
ChangeCSSInlineStyleTxn ** aTxn,
bool aRemoveProperty);
/** back-end for GetSpecifiedProperty and GetComputedProperty
*
* @param aNode [IN] a DOM node
* @param aProperty [IN] a CSS property
* @param aValue [OUT] the retrieved value for this property
* @param aStyleType [IN] eSpecified or eComputed
*/
nsresult GetCSSInlinePropertyBase(nsINode* aNode, nsIAtom* aProperty,
nsAString& aValue, StyleType aStyleType);
nsresult GetCSSInlinePropertyBase(nsIDOMNode* aNode, nsIAtom* aProperty,
nsAString& aValue, StyleType aStyleType);
private:
nsHTMLEditor *mHTMLEditor;
bool mIsCSSPrefChecked;
};
#define NS_EDITOR_INDENT_INCREMENT_IN 0.4134f
#define NS_EDITOR_INDENT_INCREMENT_CM 1.05f
#define NS_EDITOR_INDENT_INCREMENT_MM 10.5f
#define NS_EDITOR_INDENT_INCREMENT_PT 29.76f
#define NS_EDITOR_INDENT_INCREMENT_PC 2.48f
#define NS_EDITOR_INDENT_INCREMENT_EM 3
#define NS_EDITOR_INDENT_INCREMENT_EX 6
#define NS_EDITOR_INDENT_INCREMENT_PX 40
#define NS_EDITOR_INDENT_INCREMENT_PERCENT 4
#endif /* nsHTMLCSSUtils_h__ */
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