css_value.h

/*
 * This file is part of the DOM implementation for KDE.
 *
 * Copyright 1999 Lars Knoll ([email protected])
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 * This file includes excerpts from the Document Object Model (DOM)
 * Level 2 Specification (Style)
 * https://www.w3.org/TR/DOM-Level-2-Style/
 * Copyright © 2000 W3C® (MIT, INRIA, Keio), All Rights Reserved.
 *
 */
#ifndef _CSS_css_value_h_
#define _CSS_css_value_h_

#include <dom/dom_string.h>

#include <QColor>

namespace DOM
{

class CSSStyleDeclarationImpl;
class CSSRule;
class CSSValue;

/**
 * The \c CSSStyleDeclaration interface represents a
 * single <a href="https://www.w3.org/TR/CSS2/syndata.html#block">
 * CSS declaration block </a> . This interface may be used to
 * determine the style properties currently set in a block or to set
 * style properties explicitly within the block.
 *
 *  While an implementation may not recognize all CSS properties
 * within a CSS declaration block, it is expected to provide access to
 * all specified properties through the \c CSSStyleDeclaration
 * interface. Furthermore, implementations that support a
 * specific level of CSS should correctly handle <a
 * href="https://www.w3.org/TR/CSS2/about.html#shorthand"> CSS
 * shorthand </a> properties for that level. For a further discussion
 * of shorthand properties, see the \c CSS2Properties
 * interface.
 *
 */
class KHTML_EXPORT CSSStyleDeclaration
{
public:
    CSSStyleDeclaration();
    CSSStyleDeclaration(const CSSStyleDeclaration &other);
    CSSStyleDeclaration(CSSStyleDeclarationImpl *impl);
public:

    CSSStyleDeclaration &operator = (const CSSStyleDeclaration &other);

    ~CSSStyleDeclaration();

    /**
     * The parsable textual representation of the declaration block
     * (including the surrounding curly braces). Setting this
     * attribute will result in the parsing of the new value and
     * resetting of the properties in the declaration block.
     *
     */
    DOM::DOMString cssText() const;

    /**
     * see cssText
     * @exception CSSException
     * SYNTAX_ERR: Raised if the specified CSS string value has a
     * syntax error and is unparsable.
     *
     * @exception DOMException
     *  NO_MODIFICATION_ALLOWED_ERR: Raised if this declaration is
     * readonly.
     *
     */
    void setCssText(const DOM::DOMString &);

    /**
     * The number of properties that have been explicitly set in this
     * declaration block.
     *
     */
    unsigned long length() const;

    /**
     * The CSS rule that contains this declaration block.
     *
     */
    CSSRule parentRule() const;

    /**
     * Used to retrieve the value of a CSS property if it has been
     * explicitly set within this declaration block.
     *
     * @param propertyName The name of the CSS property. See the <a
     * href="https://www.w3.org/TR/CSS2/propidx.html"> CSS property
     * index </a> .
     *
     * @return Returns the value of the property if it has been
     * explicitly set for this declaration block. Returns the empty
     * string if the property has not been set.
     *
     */
    DOM::DOMString getPropertyValue(const DOM::DOMString &propertyName) const;

    /**
     * Used to retrieve the object representation of the value of a
     * CSS property if it has been explicitly set within this
     * declaration block. This method returns null if the property is
     * a <a href="https://www.w3.org/TR/CSS2/about.html#shorthand">
     * shorthand </a> property. Shorthand property values can only be
     * accessed and modified as strings, using the
     * \c getPropertyValue and \c setProperty
     * methods.
     *
     * @param propertyName The name of the CSS property. See the <a
     * href="https://www.w3.org/TR/CSS2/propidx.html"> CSS property
     * index </a> .
     *
     * @return Returns the value of the property if it has been
     * explicitly set for this declaration block. Returns the
     * \c null if the property has not been set.
     *
     */
    CSSValue getPropertyCSSValue(const DOM::DOMString &propertyName) const;

    /**
     * Used to remove a CSS property if it has been explicitly set
     * within this declaration block.
     *
     * @param propertyName The name of the CSS property. See the <a
     * href="https://www.w3.org/TR/CSS2/propidx.html"> CSS property
     * index </a> .
     *
     * @return Returns the value of the property if it has been
     * explicitly set for this declaration block. Returns the empty
     * string if the property has not been set or the property name
     * does not correspond to a valid CSS2 property.
     *
     * @exception DOMException
     * NO_MODIFICATION_ALLOWED_ERR: Raised if this declaration is
     * readonly.
     *
     */
    DOM::DOMString removeProperty(const DOM::DOMString &propertyName);

    /**
     * Used to retrieve the priority of a CSS property (e.g. the
     * \c "important" qualifier) if the property has been
     * explicitly set in this declaration block.
     *
     * @param propertyName The name of the CSS property. See the <a
     * href="https://www.w3.org/TR/CSS2/propidx.html"> CSS property
     * index </a> .
     *
     * @return A string representing the priority (e.g.
     * \c "important" ) if one exists. The empty string if none
     * exists.
     *
     */
    DOM::DOMString getPropertyPriority(const DOM::DOMString &propertyName) const;

    /**
     * Used to set a property value and priority within this
     * declaration block.
     *
     * @param propertyName The name of the CSS property. See the <a
     * href="https://www.w3.org/TR/CSS2/propidx.html"> CSS property
     * index </a> .
     *
     * @param value The new value of the property.
     *
     * @param priority The new priority of the property (e.g.
     * \c "important" ).
     *
     * @return
     *
     * @exception CSSException
     * SYNTAX_ERR: Raised if the specified value has a syntax error
     * and is unparsable.
     *
     * @exception DOMException
     *  NO_MODIFICATION_ALLOWED_ERR: Raised if this declaration is
     * readonly.
     *
     */
    void setProperty(const DOM::DOMString &propertyName, const DOM::DOMString &value, const DOM::DOMString &priority);

    /**
     * Used to retrieve the properties that have been explicitly set
     * in this declaration block. The order of the properties
     * retrieved using this method does not have to be the order in
     * which they were set. This method can be used to iterate over
     * all properties in this declaration block.
     *
     * @param index Index of the property name to retrieve.
     *
     * @return The name of the property at this ordinal position. The
     * empty string if no property exists at this position.
     *
     */
    DOM::DOMString item(unsigned long index) const;

    /**
     * @internal
     * not part of the DOM
     */
    CSSStyleDeclarationImpl *handle() const;
    bool isNull() const;

protected:
    CSSStyleDeclarationImpl *impl;
};

class CSSValueImpl;

/**
 * The \c CSSValue interface represents a simple or a
 * complexe value.
 *
 */
class KHTML_EXPORT CSSValue
{
public:
    CSSValue();
    CSSValue(const CSSValue &other);
    CSSValue(CSSValueImpl *impl);
public:

    CSSValue &operator = (const CSSValue &other);

    ~CSSValue();
    /**
     * An integer indicating which type of unit applies to the value.
     *
     *  All CSS2 constants are not supposed to be required by the
     * implementation since all CSS2 interfaces are optionals.
     *
     */
    enum UnitTypes {
        CSS_INHERIT = 0,
        CSS_PRIMITIVE_VALUE = 1,
        CSS_VALUE_LIST = 2,
        CSS_CUSTOM = 3,
        CSS_INITIAL = 4,

        CSS_SVG_VALUE = 1001 ///< Not part of DOM
    };

    /**
     * A string representation of the current value.
     *
     */
    DOM::DOMString cssText() const;

    /**
     * see cssText
     * @exception CSSException
     * SYNTAX_ERR: Raised if the specified CSS string value has a
     * syntax error and is unparsable.
     *
     * @exception DOMException
     *  NO_MODIFICATION_ALLOWED_ERR: Raised if this declaration is
     * readonly.
     *
     */
    void setCssText(const DOM::DOMString &);

    /**
     * A code defining the type of the value as defined above.
     *
     */
    unsigned short cssValueType() const;

    /**
     * @internal
     * not part of the DOM
     */
    bool isCSSValueList() const;
    bool isCSSPrimitiveValue() const;
    CSSValueImpl *handle() const;
    bool isNull() const;

protected:
    CSSValueImpl *impl;
};

class CSSValueListImpl;
class CSSValue;

/**
 * The \c CSSValueList interface provides the absraction
 * of an ordered collection of CSS values.
 *
 */
class KHTML_EXPORT CSSValueList : public CSSValue
{
public:
    CSSValueList();
    CSSValueList(const CSSValueList &other);
    CSSValueList(const CSSValue &other);
    CSSValueList(CSSValueListImpl *impl);
public:

    CSSValueList &operator = (const CSSValueList &other);
    CSSValueList &operator = (const CSSValue &other);

    ~CSSValueList();

    /**
     * The number of \c CSSValue s in the list. The range
     * of valid values indices is \c 0 to \c length-1
     * inclusive.
     *
     */
    unsigned long length() const;

    /**
     * Used to retrieve a CSS rule by ordinal index. The order in this
     * collection represents the order of the values in the CSS style
     * property.
     *
     * @param index Index into the collection.
     *
     * @return The style rule at the \c index position in
     * the \c CSSValueList , or \c null if
     * that is not valid index.
     *
     */
    CSSValue item(unsigned long index);

protected:
    CSSValueListImpl *vimpl;
};

class CSSPrimitiveValueImpl;
class Counter;
class RGBColor;
class Rect;

/**
 * The \c CSSPrimitiveValue interface represents a single
 * <a href="https://www.w3.org/TR/CSS2/syndata.html#values"> CSS
 * value </a> . This interface may be used to determine the value of a
 * specific style property currently set in a block or to set a
 * specific style properties explicitly within the block. An instance
 * of this interface can be obtained from the
 * \c getPropertyCSSValue method of the
 * \c CSSStyleDeclaration interface.
 *
 */
class KHTML_EXPORT CSSPrimitiveValue : public CSSValue
{
public:
    CSSPrimitiveValue();
    CSSPrimitiveValue(const CSSPrimitiveValue &other);
    CSSPrimitiveValue(const CSSValue &other);
    CSSPrimitiveValue(CSSPrimitiveValueImpl *impl);
public:

    CSSPrimitiveValue &operator = (const CSSPrimitiveValue &other);
    CSSPrimitiveValue &operator = (const CSSValue &other);

    ~CSSPrimitiveValue();
    /**
     * An integer indicating which type of unit applies to the value.
     *
     */
    enum UnitTypes {
        CSS_UNKNOWN = 0,
        CSS_NUMBER = 1,
        CSS_PERCENTAGE = 2,
        CSS_EMS = 3,
        CSS_EXS = 4,
        CSS_CHS = 5,
        CSS_REMS = 6,
        CSS_PX = 7,
        CSS_CM = 8,
        CSS_MM = 9,
        CSS_IN = 10,
        CSS_PT = 11,
        CSS_PC = 12,
        CSS_DEG = 13,
        CSS_RAD = 14,
        CSS_GRAD = 15,
        CSS_MS = 16,
        CSS_S = 17,
        CSS_HZ = 18,
        CSS_KHZ = 19,
        CSS_DIMENSION = 20,
        CSS_STRING = 21,
        CSS_URI = 22,
        CSS_IDENT = 23,
        CSS_ATTR = 24,
        CSS_COUNTER = 25,
        CSS_RECT = 26,
        CSS_RGBCOLOR = 27,
        CSS_DPI = 28,
        CSS_DPCM = 29,
        CSS_PAIR = 100, // We envision this being exposed as a means of getting computed style values for pairs 
        CSS_HTML_RELATIVE = 255
    };

    /**
     * The type of the value as defined by the constants specified
     * above.
     *
     */
    unsigned short primitiveType() const;

    /**
     * A method to set the float value with a specified unit. If the
     * property attached with this value can not accept the specified
     * unit or the float value, the value will be unchanged and a
     * \c DOMException will be raised.
     *
     * @param unitType A unit code as defined above. The unit code can
     * only be a float unit type (e.g. \c NUMBER ,
     * \c PERCENTAGE , \c CSS_EMS , \c CSS_EXS
     * , \c CSS_PX , \c CSS_PX ,
     * \c CSS_CM , \c CSS_MM , \c CSS_IN
     * , \c CSS_PT , \c CSS_PC ,
     * \c CSS_DEG , \c CSS_RAD ,
     * \c CSS_GRAD , \c CSS_MS , \c CSS_S
     * , \c CSS_HZ , \c CSS_KHZ ,
     * \c CSS_DIMENSION  ).
     *
     * @param floatValue The new float value.
     *
     * @return
     * @exception DOMException
     * INVALID_ACCESS_ERR: Raises if the attached property doesn't
     * support the float value or the unit type.
     *
     *  NO_MODIFICATION_ALLOWED_ERR: Raised if this property is
     * readonly.
     *
     */
    void setFloatValue(unsigned short unitType, float floatValue);

    /**
     * This method is used to get a float value in a specified unit.
     * If this CSS value doesn't contain a float value or can't be
     * converted into the specified unit, a \c DOMException
     * is raised.
     *
     * @param unitType A unit code to get the float value. The unit
     * code can only be a float unit type (e.g. \c CSS_NUMBER
     * , \c CSS_PERCENTAGE , \c CSS_EMS
     * , \c CSS_EXS , \c CSS_PX ,
     * \c CSS_PX , \c CSS_CM , \c CSS_MM
     * , \c CSS_IN , \c CSS_PT ,
     * \c CSS_PC , \c CSS_DEG , \c CSS_RAD
     * , \c CSS_GRAD , \c CSS_MS ,
     * \c CSS_S , \c CSS_HZ , \c CSS_KHZ
     * , \c CSS_DIMENSION ).
     *
     * @return The float value in the specified unit.
     *
     * @exception DOMException
     * INVALID_ACCESS_ERR: Raises if the CSS value doesn't contain a
     * float value or if the float value can't be converted into the
     * specified unit.
     *
     */
    float getFloatValue(unsigned short unitType) const;

    /**
     * A method to set the string value with a specified unit. If the
     * property attached to this value can't accept the specified unit
     * or the string value, the value will be unchanged and a
     * \c DOMException will be raised.
     *
     * @param stringType A string code as defined above. The string
     * code can only be a string unit type (e.g. \c CSS_URI
     * , \c CSS_IDENT , \c CSS_INHERIT
     * and \c CSS_ATTR ).
     *
     * @param stringValue The new string value. If the
     * \c stringType is equal to \c CSS_INHERIT , the
     * \c stringValue should be \c inherit .
     *
     * @return
     * @exception DOMException
     * INVALID_ACCESS_ERR: Raises if the CSS value doesn't contain a
     * string value or if the string value can't be converted into the
     * specified unit.
     *
     *  NO_MODIFICATION_ALLOWED_ERR: Raised if this property is
     * readonly.
     *
     */
    void setStringValue(unsigned short stringType, const DOM::DOMString &stringValue);

    /**
     * This method is used to get the string value in a specified
     * unit. If the CSS value doesn't contain a string value, a
     * \c DOMException is raised.
     *
     * @return The string value in the current unit. The current
     * \c valueType can only be a string unit type (e.g.
     * \c CSS_URI , \c CSS_IDENT and
     * \c CSS_ATTR ).
     *
     * @exception DOMException
     * INVALID_ACCESS_ERR: Raises if the CSS value doesn't contain a
     * string value.
     *
     */
    DOM::DOMString getStringValue() const;

    /**
     * This method is used to get the Counter value. If this CSS value
     * doesn't contain a counter value, a \c DOMException
     * is raised. Modification to the corresponding style property can
     * be achieved using the \c Counter interface.
     *
     * @return The Counter value.
     *
     * @exception DOMException
     * INVALID_ACCESS_ERR: Raises if the CSS value doesn't contain a
     * Counter value.
     *
     */
    Counter getCounterValue() const;

    /**
     * This method is used to get the Rect value. If this CSS value
     * doesn't contain a rect value, a \c DOMException is
     * raised. Modification to the corresponding style property can be
     * achieved using the \c Rect interface.
     *
     * @return The Rect value.
     *
     * @exception DOMException
     * INVALID_ACCESS_ERR: Raises if the CSS value doesn't contain a
     * Rect value.
     *
     */
    Rect getRectValue() const;

    /**
     * This method is used to get the RGB color. If this CSS value
     * doesn't contain a RGB color value, a \c DOMException
     * is raised. Modification to the corresponding style
     * property can be achieved using the \c RGBColor
     * interface.
     *
     * @return the RGB color value.
     *
     * @exception DOMException
     * INVALID_ACCESS_ERR: Raises if the attached property can't
     * return a RGB color value.
     *
     */
    RGBColor getRGBColorValue() const;
};

/**
 * The \c RGBColor interface is used to represent any <a
 * href="https://www.w3.org/TR/CSS2/syndata.html#value-def-color">
 * RGB color </a> value. This interface reflects the values in the
 * underlying style property. Hence, modifications made through this
 * interface modify the style property.
 *
 */
class KHTML_EXPORT RGBColor
{
public:
    RGBColor();
    /**
     * @deprecated
     */
    RGBColor(const QColor &c)
    {
        m_color = c.rgb();
    }
    RGBColor(QRgb color);

    RGBColor(const RGBColor &other);
    RGBColor &operator = (const RGBColor &other);

    ~RGBColor();

    /**
     * This attribute is used for the red value of the RGB color.
     *
     */
    CSSPrimitiveValue red() const;

    /**
     * This attribute is used for the green value of the RGB color.
     *
     */
    CSSPrimitiveValue green() const;

    /**
     * This attribute is used for the blue value of the RGB color.
     *
     */
    CSSPrimitiveValue blue() const;

    /**
     * @internal
     */
    QRgb color() const
    {
        return m_color;
    }
protected:
    QRgb m_color;
};

class RectImpl;

/**
 * The \c Rect interface is used to represent any <a
 * href="https://www.w3.org/TR/CSS2/visufx.html#value-def-shape">
 * rect </a> value. This interface reflects the values in the
 * underlying style property. Hence, modifications made through this
 * interface modify the style property.
 *
 */
class KHTML_EXPORT Rect
{
    friend class CSSPrimitiveValue;
public:
    Rect();
    Rect(const Rect &other);

    Rect &operator = (const Rect &other);

    ~Rect();

    /**
     * This attribute is used for the top of the rect.
     *
     */
    CSSPrimitiveValue top() const;

    /**
     * This attribute is used for the right of the rect.
     *
     */
    CSSPrimitiveValue right() const;

    /**
     * This attribute is used for the bottom of the rect.
     *
     */
    CSSPrimitiveValue bottom() const;

    /**
     * This attribute is used for the left of the rect.
     *
     */
    CSSPrimitiveValue left() const;

    /**
     * @internal
     * not part of the DOM
     */
    RectImpl *handle() const;
    bool isNull() const;

protected:
    RectImpl *impl;
    Rect(RectImpl *i);
};

class CounterImpl;

/**
 * The \c Counter interface is used to represent any <a
 * href="https://www.w3.org/TR/CSS2/syndata.html#value-def-counter">
 * counter or counters function </a> value. This interface reflects
 * the values in the underlying style property. Hence, modifications
 * made through this interface modify the style property.
 *
 */
class KHTML_EXPORT Counter
{
    friend class CSSPrimitiveValue;
public:
    Counter();
    Counter(const Counter &other);
public:

    Counter &operator = (const Counter &other);

    ~Counter();

    /**
     * This attribute is used for the identifier of the counter.
     *
     */
    DOM::DOMString identifier() const;

    /**
     * This attribute is used for the style of the list.
     *
     */
    DOM::DOMString listStyle() const;

    /**
     * This attribute is used for the separator of nested counters.
     *
     */
    DOM::DOMString separator() const;

    /**
     * @internal
     * not part of the DOM
     */
    CounterImpl *handle() const;
    bool isNull() const;

protected:
    CounterImpl *impl;
    Counter(CounterImpl *i);
};

} // namespace

#endif