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base.rs
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base.rs
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#[doc="Fundamental layout structures and algorithms."]
import dom::base::{element, es_div, es_img, node_data, node_kind, node};
import dom::rcu;
import dom::rcu::reader_methods;
import gfx::geom;
import gfx::geom::{size, rect, point, au, zero_size_au};
import image::base::image;
import /*layout::*/block::block_layout_methods;
import /*layout::*/inline::inline_layout_methods;
import /*layout::*/style::style::*;
import /*layout::*/text::{text_box, text_layout_methods};
import util::tree;
enum box_kind {
bk_block,
bk_inline,
bk_intrinsic(@geom::size<au>),
bk_text(@text_box)
}
class appearance {
let mut background_image: option<@image>;
new() {
self.background_image = none;
}
}
enum box = {
tree: tree::fields<@box>,
node: node,
mut bounds: geom::rect<au>,
kind: box_kind,
appearance: appearance
};
enum layout_data = {
mut computed_style: computed_style,
mut box: option<@box>
};
enum ntree { ntree }
impl of tree::rd_tree_ops<node> for ntree {
fn each_child(node: node, f: fn(node) -> bool) {
tree::each_child(self, node, f)
}
fn with_tree_fields<R>(n: node, f: fn(tree::fields<node>) -> R) -> R {
n.rd { |n| f(n.tree) }
}
}
enum btree { btree }
impl of tree::rd_tree_ops<@box> for btree {
fn each_child(node: @box, f: fn(&&@box) -> bool) {
tree::each_child(self, node, f)
}
fn with_tree_fields<R>(b: @box, f: fn(tree::fields<@box>) -> R) -> R {
f(b.tree)
}
}
impl of tree::wr_tree_ops<@box> for btree {
fn add_child(node: @box, child: @box) {
tree::add_child(self, node, child)
}
fn with_tree_fields<R>(b: @box, f: fn(tree::fields<@box>) -> R) -> R {
f(b.tree)
}
}
impl layout_methods_priv for @box {
#[doc="Dumps the box tree, for debugging, with indentation."]
fn dump_indent(indent: uint) {
let mut s = "";
uint::range(0u, indent) {
|_i|
s += " ";
}
s += #fmt("%?", self.kind);
#debug["%s", s];
for btree.each_child(self) { |kid| kid.dump_indent(indent + 1u) }
}
}
impl layout_methods for @box {
#[doc="The main reflow routine."]
fn reflow(available_width: au) {
alt self.kind {
bk_block { self.reflow_block(available_width) }
bk_inline { self.reflow_inline(available_width) }
bk_intrinsic(size) { self.reflow_intrinsic(*size) }
bk_text(subbox) { self.reflow_text(available_width, subbox) }
}
}
#[doc="The trivial reflow routine for instrinsically-sized frames."]
fn reflow_intrinsic(size: geom::size<au>) {
self.bounds.size = size;
#debug["reflow_intrinsic size=%?", self.bounds];
}
#[doc="Dumps the box tree, for debugging."]
fn dump() {
self.dump_indent(0u);
}
}
// Debugging
impl node_methods_priv for node {
#[doc="Dumps the node tree, for debugging, with indentation."]
fn dump_indent(indent: uint) {
let mut s = "";
uint::range(0u, indent) {
|_i|
s += " ";
}
s += #fmt("%?", self.rd({ |n| n.kind }));
#debug["%s", s];
for ntree.each_child(self) { |kid| kid.dump_indent(indent + 1u) }
}
}
impl node_methods for node {
#[doc="Dumps the subtree rooted at this node, for debugging."]
fn dump() {
self.dump_indent(0u);
}
}
#[cfg(test)]
mod test {
import dom::base::{element, es_div, es_img, methods, nk_element, node_data,
node_kind, node, wr_tree_ops};
import dom::rcu::scope;
import box_builder::{box_builder_methods};
/*
use sdl;
import sdl::video;
fn with_screen(f: fn(*sdl::surface)) {
let screen = video::set_video_mode(
320, 200, 32,
[video::hwsurface], [video::doublebuf]);
assert screen != ptr::null();
f(screen);
video::free_surface(screen);
}
*/
fn flat_bounds(root: @box) -> [geom::rect<au>] {
let mut r = [];
for tree::each_child(btree, root) {|c|
r += flat_bounds(c);
}
ret r + [root.bounds];
}
#[test]
#[ignore(reason = "busted")]
fn do_layout() {
let s = scope();
let n0 = s.new_node(nk_element(element("img",
~es_img(size(au(10),au(10))))));
let n1 = s.new_node(nk_element(element("img",
~es_img(size(au(10),au(15))))));
let n2 = s.new_node(nk_element(element("img",
~es_img(size(au(10),au(20))))));
let n3 = s.new_node(nk_element(element("div", ~es_div)));
tree::add_child(s, n3, n0);
tree::add_child(s, n3, n1);
tree::add_child(s, n3, n2);
let b0 = n0.construct_boxes();
let b1 = n1.construct_boxes();
let b2 = n2.construct_boxes();
let b3 = n3.construct_boxes();
tree::add_child(btree, b3, b0);
tree::add_child(btree, b3, b1);
tree::add_child(btree, b3, b2);
b3.reflow_block(au(100));
let fb = flat_bounds(b3);
#debug["fb=%?", fb];
assert fb == [geom::box(au(0), au(0), au(10), au(10)), // n0
geom::box(au(0), au(10), au(10), au(15)), // n1
geom::box(au(0), au(25), au(10), au(20)), // n2
geom::box(au(0), au(0), au(100), au(45))]; // n3
}
}