netsurf/content/handlers/html/box.h

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/*
* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
* Copyright 2003 Phil Mellor <monkeyson@users.sourceforge.net>
* Copyright 2020 Vincent Sanders <vince@netsurf-browser.org>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* \file
* Box interface.
*
*/
#ifndef NETSURF_HTML_BOX_H
#define NETSURF_HTML_BOX_H
#include <limits.h>
#include <stdbool.h>
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#include <libcss/libcss.h>
#include "content/handlers/css/utils.h"
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struct content;
struct box;
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struct browser_window;
struct html_content;
struct nsurl;
struct dom_node;
struct dom_string;
struct rect;
#define UNKNOWN_WIDTH INT_MAX
#define UNKNOWN_MAX_WIDTH INT_MAX
typedef void (*box_construct_complete_cb)(struct html_content *c, bool success);
/**
* Type of a struct box.
*/
typedef enum {
BOX_BLOCK,
BOX_INLINE_CONTAINER,
BOX_INLINE,
BOX_TABLE,
BOX_TABLE_ROW,
BOX_TABLE_CELL,
BOX_TABLE_ROW_GROUP,
BOX_FLOAT_LEFT,
BOX_FLOAT_RIGHT,
BOX_INLINE_BLOCK,
BOX_BR,
BOX_TEXT,
BOX_INLINE_END,
BOX_NONE
} box_type;
/**
* Flags for a struct box.
*/
typedef enum {
NEW_LINE = 1 << 0, /* first inline on a new line */
STYLE_OWNED = 1 << 1, /* style is owned by this box */
PRINTED = 1 << 2, /* box has already been printed */
PRE_STRIP = 1 << 3, /* PRE tag needing leading newline stripped */
CLONE = 1 << 4, /* continuation of previous box from wrapping */
MEASURED = 1 << 5, /* text box width has been measured */
HAS_HEIGHT = 1 << 6, /* box has height (perhaps due to children) */
MAKE_HEIGHT = 1 << 7, /* box causes its own height */
NEED_MIN = 1 << 8, /* minimum width is required for layout */
REPLACE_DIM = 1 << 9, /* replaced element has given dimensions */
IFRAME = 1 << 10, /* box contains an iframe */
CONVERT_CHILDREN = 1 << 11, /* wanted children converting */
IS_REPLACED = 1 << 12 /* box is a replaced element */
} box_flags;
/**
* Sides of a box
*/
enum box_side { TOP, RIGHT, BOTTOM, LEFT };
/**
* Container for box border details
*/
struct box_border {
enum css_border_style_e style; /**< border-style */
css_color c; /**< border-color value */
int width; /**< border-width (pixels) */
};
/**
* Table column data.
*/
struct column {
/**
* Type of column.
*/
enum {
COLUMN_WIDTH_UNKNOWN,
COLUMN_WIDTH_FIXED,
COLUMN_WIDTH_AUTO,
COLUMN_WIDTH_PERCENT,
COLUMN_WIDTH_RELATIVE
} type;
/**
* Preferred width of column. Pixels for FIXED, percentage for
* PERCENT, relative units for RELATIVE, unused for AUTO.
*/
int width;
/**
* Minimum width of content.
*/
int min;
/**
* Maximum width of content.
*/
int max;
/**
* Whether all of column's cells are css positioned.
*/
bool positioned;
};
/**
* Linked list of object element parameters.
*/
struct object_param {
char *name;
char *value;
char *type;
char *valuetype;
struct object_param *next;
};
/**
* Parameters for object element and similar elements.
*/
struct object_params {
struct nsurl *data;
char *type;
char *codetype;
struct nsurl *codebase;
struct nsurl *classid;
struct object_param *params;
};
/**
* Node in box tree. All dimensions are in pixels.
*/
struct box {
/**
* Type of box.
*/
box_type type;
/**
* Box flags
*/
box_flags flags;
/**
* DOM node that generated this box or NULL
*/
struct dom_node *node;
/**
* Computed styles for elements and their pseudo elements.
* NULL on non-element boxes.
*/
css_select_results *styles;
/**
* Style for this box. 0 for INLINE_CONTAINER and
* FLOAT_*. Pointer into a box's 'styles' select results,
* except for implied boxes, where it is a pointer to an
* owned computed style.
*/
css_computed_style *style;
/**
* value of id attribute (or name for anchors)
*/
lwc_string *id;
/**
* Next sibling box, or NULL.
*/
struct box *next;
/**
* Previous sibling box, or NULL.
*/
struct box *prev;
/**
* First child box, or NULL.
*/
struct box *children;
/**
* Last child box, or NULL.
*/
struct box *last;
/**
* Parent box, or NULL.
*/
struct box *parent;
/**
* INLINE_END box corresponding to this INLINE box, or INLINE
* box corresponding to this INLINE_END box.
*/
struct box *inline_end;
/**
* First float child box, or NULL. Float boxes are in the tree
* twice, in this list for the block box which defines the
* area for floats, and also in the standard tree given by
* children, next, prev, etc.
*/
struct box *float_children;
/**
* Next sibling float box.
*/
struct box *next_float;
/**
* If box is a float, points to box's containing block
*/
struct box *float_container;
/**
* Level below which subsequent floats must be cleared. This
* is used only for boxes with float_children
*/
int clear_level;
/**
* Level below which floats have been placed.
*/
int cached_place_below_level;
/**
* Coordinate of left padding edge relative to parent box, or
* relative to ancestor that contains this box in
* float_children for FLOAT_.
*/
int x;
/**
* Coordinate of top padding edge, relative as for x.
*/
int y;
/**
* Width of content box (excluding padding etc.).
*/
int width;
/**
* Height of content box (excluding padding etc.).
*/
int height;
/* These four variables determine the maximum extent of a box's
* descendants. They are relative to the x,y coordinates of the box.
*
* Their use depends on the overflow CSS property:
*
* Overflow: Usage:
* visible The content of the box is displayed within these
* dimensions.
* hidden These are ignored. Content is plotted within the box
* dimensions.
* scroll These are used to determine the extent of the
* scrollable area.
* auto As "scroll".
*/
int descendant_x0; /**< left edge of descendants */
int descendant_y0; /**< top edge of descendants */
int descendant_x1; /**< right edge of descendants */
int descendant_y1; /**< bottom edge of descendants */
/**
* Margin: TOP, RIGHT, BOTTOM, LEFT.
*/
int margin[4];
/**
* Padding: TOP, RIGHT, BOTTOM, LEFT.
*/
int padding[4];
/**
* Border: TOP, RIGHT, BOTTOM, LEFT.
*/
struct box_border border[4];
/**
* Horizontal scroll.
*/
struct scrollbar *scroll_x;
/**
* Vertical scroll.
*/
struct scrollbar *scroll_y;
/**
* Width of box taking all line breaks (including margins
* etc). Must be non-negative.
*/
int min_width;
/**
* Width that would be taken with no line breaks. Must be
* non-negative.
*/
int max_width;
/**
* Text, or NULL if none. Unterminated.
*/
char *text;
/**
* Length of text.
*/
size_t length;
/**
* Width of space after current text (depends on font and size).
*/
int space;
/**
* Byte offset within a textual representation of this content.
*/
size_t byte_offset;
/**
* Link, or NULL.
*/
struct nsurl *href;
/**
* Link target, or NULL.
*/
const char *target;
/**
* Title, or NULL.
*/
const char *title;
/**
* Number of columns for TABLE / TABLE_CELL.
*/
unsigned int columns;
/**
* Number of rows for TABLE only.
*/
unsigned int rows;
/**
* Start column for TABLE_CELL only.
*/
unsigned int start_column;
/**
* Array of table column data for TABLE only.
*/
struct column *col;
/**
* List marker box if this is a list-item, or NULL.
*/
struct box *list_marker;
/**
* Form control data, or NULL if not a form control.
*/
struct form_control* gadget;
/**
* (Image)map to use with this object, or NULL if none
*/
char *usemap;
/**
* Background image for this box, or NULL if none
*/
struct hlcache_handle *background;
/**
* Object in this box (usually an image), or NULL if none.
*/
struct hlcache_handle* object;
/**
* Parameters for the object, or NULL.
*/
struct object_params *object_params;
/**
* Iframe's browser_window, or NULL if none
*/
struct browser_window *iframe;
};
#endif