## cr-cascade

cr-cascade

## Synopsis

                        CRCascadePriv;
                        CRCascade;
    CRCascade *         cr_cascade_new                      (CRStyleSheet *a_author_sheet,
                                                             CRStyleSheet *a_user_sheet,
                                                             CRStyleSheet *a_ua_sheet);
    CRStyleSheet *      cr_cascade_get_sheet                (CRCascade *a_this,
                                                             enum CRStyleOrigin a_origin);
    enum CRStatus       cr_cascade_set_sheet                (CRCascade *a_this,
                                                             CRStyleSheet *a_sheet,
                                                             enum CRStyleOrigin a_origin);
    void                cr_cascade_ref                      (CRCascade *a_this);
    void                cr_cascade_unref                    (CRCascade *a_this);
    void                cr_cascade_destroy                  (CRCascade *a_this);

## Description

## Details

### CRCascadePriv

    typedef struct _CRCascadePriv CRCascadePriv;

### CRCascade

    typedef struct {
    	CRCascadePriv *priv ;
    } CRCascade;

### cr_cascade_new ()

    CRCascade *         cr_cascade_new                      (CRStyleSheet *a_author_sheet,
                                                             CRStyleSheet *a_user_sheet,
                                                             CRStyleSheet *a_ua_sheet);

Constructor of the CRCascade class. Note that all three parameters of this method are ref counted and their refcount is increased. Their refcount will be decreased at the destruction of the instance of CRCascade. So the caller should not call their destructor. The caller should call their ref/unref method instead if it wants

`a_author_sheet` : | the author origin style sheet. May be NULL.
`a_user_sheet` : | the user origin style sheet. May be NULL.
`a_ua_sheet` : | the user agent origin style sheet. May be NULL.
Returns : | the newly built instance of CRCascade or NULL if an error arose during constrution.

### cr_cascade_get_sheet ()

    CRStyleSheet *      cr_cascade_get_sheet                (CRCascade *a_this,
                                                             enum CRStyleOrigin a_origin);

Gets a sheet, part of the cascade. Note that the returned stylesheet is refcounted so if the caller wants to manage it's lifecycle, it must use `cr_stylesheet_ref()`/`cr_stylesheet_unref()` instead of the `cr_stylesheet_destroy()` method.

`a_this` : | the current instance of CRCascade.
`a_origin` : | the origin of the style sheet as defined in the css2 spec in chapter 6.4. Gets a given origin sheet.
Returns : | the style sheet, or NULL if it does not exist.

### cr_cascade_set_sheet ()

    enum CRStatus       cr_cascade_set_sheet                (CRCascade *a_this,
                                                             CRStyleSheet *a_sheet,
                                                             enum CRStyleOrigin a_origin);

Sets a stylesheet in the cascade

`a_this` : | the current instance of CRCascade.
`a_sheet` : | the stylesheet to set.
`a_origin` : | the origin of the stylesheet.
Returns : | CR_OK upon successfull completion, an error code otherwise.

### cr_cascade_ref ()

    void                cr_cascade_ref                      (CRCascade *a_this);

Increases the reference counter of the current instance of CRCascade.

`a_this` : | the current instance of CRCascade

### cr_cascade_unref ()

    void                cr_cascade_unref                    (CRCascade *a_this);

Decrements the reference counter associated to this instance of CRCascade. If the reference counter reaches zero, the instance is destroyed using `cr_cascade_destroy()`

`a_this` : | the current instance of CRCascade.

### cr_cascade_destroy ()

    void                cr_cascade_destroy                  (CRCascade *a_this);

Destructor of CRCascade.

`a_this` : | the current instance of CRCascade