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Fix relative positioning to affect position of descendant floats which are in a block formatting context which is an ancestor of the relatively positioned box.

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svn path=/trunk/netsurf/; revision=5390
This commit is contained in:
Michael Drake 2008-09-21 19:18:27 +00:00
parent dd1afc041d
commit 1850a494e7
1 changed files with 58 additions and 8 deletions
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66
render/layout.c
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@ -93,7 +93,8 @@ static void calculate_mbp_width(struct css_style *style, unsigned int side,
int *fixed, float *frac);
static void layout_lists(struct box *box,
const struct font_functions *font_func);
static void layout_position_relative(struct box *root);
static void layout_position_relative(struct box *root, struct box *fp,
int fx, int fy);
static void layout_compute_relative_offset(struct box *box, int *x, int *y);
static bool layout_position_absolute(struct box *box,
struct box *containing_block,
@ -157,7 +158,7 @@ bool layout_document(struct content *content, int width, int height)
layout_lists(doc, font_func);
layout_position_absolute(doc, doc, 0, 0, content);
layout_position_relative(doc);
layout_position_relative(doc, doc, 0, 0);
layout_calculate_descendant_bboxes(doc);
@ -2852,11 +2853,28 @@ void layout_lists(struct box *box,
/**
* Adjust positions of relatively positioned boxes.
*
* \param root box to adjust the position of
* \param fp box which forms the block formatting context for children of
* "root" which are floats
* \param fx x offset due to intervening relatively positioned boxes
* between current box, "root", and the block formatting context
* box, "fp", for float children of "root"
* \param fy y offset due to intervening relatively positioned boxes
* between current box, "root", and the block formatting context
* box, "fp", for float children of "root"
*/
void layout_position_relative(struct box *root)
void layout_position_relative(struct box *root, struct box *fp, int fx, int fy)
{
struct box *box;
struct box *box; /* for children of "root" */
struct box *fn; /* for block formatting context box for children of
* "box" */
struct box *fc; /* for float children of the block formatting context,
* "fp" */
int x, y; /* for the offsets resulting from any relative
* positioning on the current block */
int fnx, fny; /* for affsets which apply to flat children of "box" */
/**\todo ensure containing box is large enough after moving boxes */
@ -2864,21 +2882,53 @@ void layout_position_relative(struct box *root)
/* Normal children */
for (box = root->children; box; box = box->next) {
int x, y;
if (box->type == BOX_TEXT)
continue;
/* If relatively positioned, get offsets */
if (box->style && box->style->position == CSS_POSITION_RELATIVE)
layout_compute_relative_offset(box, &x, &y);
else
x = y = 0;
/* Adjust float coordinates.
* (note float x and y are relative to their block formatting
* context box and not their parent) */
if (box->style && (box->style->float_ == CSS_FLOAT_LEFT ||
box->style->float_ == CSS_FLOAT_RIGHT) &&
(fx != 0 || fy != 0)) {
/* box is a float and there is a float offset to
* apply */
for (fc = fp->float_children; fc; fc = fc->next_float) {
if (box == fc->children) {
/* Box is floated in the block
* formatting context block, fp.
* Apply float offsets. */
box->x += fx;
box->y += fy;
fx = fy = 0;
}
}
}
if (box->float_children) {
fn = box;
fnx = fny = 0;
} else {
fn = fp;
fnx = fx + x;
fny = fy + y;
}
/* recurse first */
layout_position_relative(box);
layout_position_relative(box, fn, fnx, fny);
/* Ignore things we're not interested in. */
if (!box->style || (box->style &&
box->style->position != CSS_POSITION_RELATIVE))
continue;
layout_compute_relative_offset(box, &x, &y);
box->x += x;
box->y += y;