297 lines
9.6 KiB
C
297 lines
9.6 KiB
C
/*
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* This file is part of NetSurf, http://netsurf.sourceforge.net/
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* Licensed under the GNU General Public License,
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* http://www.opensource.org/licenses/gpl-license
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* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
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* Copyright 2003 Phil Mellor <monkeyson@users.sourceforge.net>
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*/
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/** \file
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* Box tree construction and manipulation (interface).
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*
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* This stage of rendering converts a tree of xmlNodes (produced by libxml2)
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* to a tree of struct box. The box tree represents the structure of the
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* document as given by the CSS display and float properties.
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*
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* For example, consider the following HTML:
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* \code
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* <h1>Example Heading</h1>
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* <p>Example paragraph <em>with emphasised text</em> etc.</p> \endcode
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*
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* This would produce approximately the following box tree with default CSS
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* rules:
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* \code
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* BOX_BLOCK (corresponds to h1)
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* BOX_INLINE_CONTAINER
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* BOX_INLINE "Example Heading"
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* BOX_BLOCK (p)
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* BOX_INLINE_CONTAINER
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* BOX_INLINE "Example paragraph "
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* BOX_INLINE "with emphasised text" (em)
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* BOX_INLINE "etc." \endcode
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*
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* Note that the em has been collapsed into the INLINE_CONTAINER.
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*
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* If these CSS rules were applied:
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* \code
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* h1 { display: table-cell }
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* p { display: table-cell }
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* em { float: left; width: 5em } \endcode
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*
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* then the box tree would instead look like this:
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* \code
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* BOX_TABLE
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* BOX_TABLE_ROW_GROUP
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* BOX_TABLE_ROW
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* BOX_TABLE_CELL (h1)
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* BOX_INLINE_CONTAINER
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* BOX_INLINE "Example Heading"
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* BOX_TABLE_CELL (p)
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* BOX_INLINE_CONTAINER
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* BOX_INLINE "Example paragraph "
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* BOX_FLOAT_LEFT (em)
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* BOX_BLOCK
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* BOX_INLINE_CONTAINER
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* BOX_INLINE "with emphasised text"
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* BOX_INLINE "etc." \endcode
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*
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* Here implied boxes have been added and a float is present.
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*
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* A box tree is "normalized" if the following is satisfied:
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* \code
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* parent permitted child nodes
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* BLOCK, INLINE_BLOCK BLOCK, INLINE_CONTAINER, TABLE
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* INLINE_CONTAINER INLINE, INLINE_BLOCK, FLOAT_LEFT, FLOAT_RIGHT, BR, TEXT,
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* INLINE_END
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* INLINE none
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* TABLE at least 1 TABLE_ROW_GROUP
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* TABLE_ROW_GROUP at least 1 TABLE_ROW
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* TABLE_ROW at least 1 TABLE_CELL
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* TABLE_CELL BLOCK, INLINE_CONTAINER, TABLE (same as BLOCK)
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* FLOAT_(LEFT|RIGHT) exactly 1 BLOCK or TABLE \endcode
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*/
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#ifndef _NETSURF_RENDER_BOX_H_
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#define _NETSURF_RENDER_BOX_H_
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#include <limits.h>
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#include <stdbool.h>
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#include "libxml/HTMLparser.h"
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struct box;
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struct column;
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struct css_style;
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struct object_params;
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struct object_param;
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/** Type of a struct box. */
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typedef enum {
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BOX_BLOCK, BOX_INLINE_CONTAINER, BOX_INLINE,
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BOX_TABLE, BOX_TABLE_ROW, BOX_TABLE_CELL,
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BOX_TABLE_ROW_GROUP,
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BOX_FLOAT_LEFT, BOX_FLOAT_RIGHT,
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BOX_INLINE_BLOCK, BOX_BR, BOX_TEXT,
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BOX_INLINE_END
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} box_type;
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struct rect {
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int x0, y0;
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int x1, y1;
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};
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/** Node in box tree. All dimensions are in pixels. */
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struct box {
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/** Type of box. */
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box_type type;
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/** Style for this box. 0 for INLINE_CONTAINER and FLOAT_*. */
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struct css_style * style;
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/** Coordinate of left padding edge relative to parent box, or relative
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* to ancestor that contains this box in float_children for FLOAT_. */
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int x;
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/** Coordinate of top padding edge, relative as for x. */
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int y;
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int width; /**< Width of content box (excluding padding etc.). */
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int height; /**< Height of content box (excluding padding etc.). */
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/* These four variables determine the maximum extent of a box's
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* descendants. They are relative to the x,y coordinates of the box.
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*
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* Their use depends on the overflow CSS property:
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*
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* Overflow: Usage:
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* visible The content of the box is displayed within these
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* dimensions.
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* hidden These are ignored. Content is plotted within the box
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* dimensions.
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* scroll These are used to determine the extent of the
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* scrollable area.
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* auto As "scroll".
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*/
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int descendant_x0; /**< left edge of descendants */
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int descendant_y0; /**< top edge of descendants */
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int descendant_x1; /**< right edge of descendants */
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int descendant_y1; /**< bottom edge of descendants */
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int margin[4]; /**< Margin: TOP, RIGHT, BOTTOM, LEFT. */
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int padding[4]; /**< Padding: TOP, RIGHT, BOTTOM, LEFT. */
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int border[4]; /**< Border width: TOP, RIGHT, BOTTOM, LEFT. */
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int scroll_x; /**< Horizontal scroll of descendants. */
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int scroll_y; /**< Vertical scroll of descendants. */
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/** Width of box taking all line breaks (including margins etc). Must
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* be non-negative. */
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int min_width;
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/** Width that would be taken with no line breaks. Must be
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* non-negative. */
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int max_width;
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/**< Byte offset within a textual representation of this content. */
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size_t byte_offset;
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char *text; /**< Text, or 0 if none. Unterminated. */
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size_t length; /**< Length of text. */
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/** Text is followed by a space. */
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unsigned int space : 1;
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/** This box is a continuation of the previous box (eg from line
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* breaking). */
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unsigned int clone : 1;
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/** This box represents a <pre> tag which has not yet had its white
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* space stripped if possible
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*/
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unsigned int strip_leading_newline : 1;
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char *href; /**< Link, or 0. */
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const char *target; /**< Link target, or 0. */
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char *title; /**< Title, or 0. */
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unsigned int columns; /**< Number of columns for TABLE / TABLE_CELL. */
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unsigned int rows; /**< Number of rows for TABLE only. */
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unsigned int start_column; /**< Start column for TABLE_CELL only. */
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struct box *next; /**< Next sibling box, or 0. */
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struct box *prev; /**< Previous sibling box, or 0. */
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struct box *children; /**< First child box, or 0. */
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struct box *last; /**< Last child box, or 0. */
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struct box *parent; /**< Parent box, or 0. */
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struct box *fallback; /**< Fallback children for object, or 0. */
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/** INLINE_END box corresponding to this INLINE box, or INLINE box
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* corresponding to this INLINE_END box. */
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struct box *inline_end;
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/** First float child box, or 0. Float boxes are in the tree twice, in
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* this list for the block box which defines the area for floats, and
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* also in the standard tree given by children, next, prev, etc. */
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struct box *float_children;
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/** Next sibling float box. */
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struct box *next_float;
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/** First absolutely positioned child box, or 0. Absolutely positioned
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* boxes are linked by next / prev and do not appear under children. */
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struct box *absolute_children;
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struct column *col; /**< Array of table column data for TABLE only. */
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/** Form control data, or 0 if not a form control. */
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struct form_control* gadget;
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char *usemap; /** (Image)map to use with this object, or 0 if none */
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char *id; /**< value of id attribute (or name for anchors) */
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/** Background image for this box, or 0 if none */
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struct content *background;
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/** Object in this box (usually an image), or 0 if none. */
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struct content* object;
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/** Parameters for the object, or 0. */
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struct object_params *object_params;
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};
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/** Table column data. */
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struct column {
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/** Type of column. */
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enum { COLUMN_WIDTH_UNKNOWN, COLUMN_WIDTH_FIXED,
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COLUMN_WIDTH_AUTO, COLUMN_WIDTH_PERCENT,
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COLUMN_WIDTH_RELATIVE } type;
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/** Preferred width of column. Pixels for FIXED, percentage for PERCENT,
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* relative units for RELATIVE, unused for AUTO. */
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int width;
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/** Minimum width of content. */
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int min;
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/** Maximum width of content. */
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int max;
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};
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/** Parameters for <object> and similar elements. */
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struct object_params {
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char *data;
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char *type;
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char *codetype;
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char *codebase;
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char *classid;
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struct object_param *params;
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};
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/** Linked list of <object> parameters. */
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struct object_param {
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char *name;
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char *value;
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char *type;
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char *valuetype;
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struct object_param *next;
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};
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/** Frame target names (constant pointers to save duplicating the strings many
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* times). We convert _blank to _top for user-friendliness. */
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extern const char *TARGET_SELF;
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extern const char *TARGET_PARENT;
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extern const char *TARGET_TOP;
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#define UNKNOWN_WIDTH INT_MAX
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#define UNKNOWN_MAX_WIDTH INT_MAX
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struct box * box_create(struct css_style *style,
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char *href, const char *target, char *title,
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char *id, void *context);
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void box_add_child(struct box *parent, struct box *child);
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void box_add_absolute_child(struct box *parent, struct box *child);
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void box_insert_sibling(struct box *box, struct box *new_box);
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void box_unlink_and_free(struct box *box);
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void box_free(struct box *box);
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void box_free_box(struct box *box);
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void box_free_object_params(struct object_params *op);
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void box_bounds(struct box *box, struct rect *r);
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void box_coords(struct box *box, int *x, int *y);
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struct box *box_at_point(struct box *box, int x, int y,
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int *box_x, int *box_y,
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struct content **content);
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struct box *box_object_at_point(struct content *c, int x, int y);
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struct box *box_find_by_id(struct box *box, const char *id);
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void box_dump(struct box *box, unsigned int depth);
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bool box_extract_link(const char *rel, const char *base, char **result);
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bool box_vscrollbar_present(const struct box *box);
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bool box_hscrollbar_present(const struct box *box);
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void box_scrollbar_dimensions(const struct box *box,
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int padding_width, int padding_height, int w,
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bool *vscroll, bool *hscroll,
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int *well_height,
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int *bar_top, int *bar_height,
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int *well_width,
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int *bar_left, int *bar_width);
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bool xml_to_box(xmlNode *n, struct content *c);
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bool box_normalise_block(struct box *block, struct content *c);
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#endif
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