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/*
* This file is part of LibNSLayout
* Licensed under the ISC License, http://opensource.org/licenses/ISC
* Copyright 2015 Michael Drake <tlsa@netsurf-browser.org>
*/
/** \file src/layout.c
* Layout object handling
*/
#include <assert.h>
#include <stdlib.h>
#include "libnslayout/nslayout.h"
#include "layout.h"
#include "util/util.h"
#include "dom/watcher.h"
#include "util/dom-str.h"
/**
* The layout object for a DOM document
*/
struct nslayout_layout {
dom_document *document;
css_select_ctx *css_ctx;
css_media_type *media;
nslayout_callback cb;
void *pw;
struct nsl_dom_watcher *watcher;
};
/* Publically exported function, documented in include/libnslayout/nslayout.h */
nslayout_error nslayout_init(void)
{
return nsl_dom_str_init();
}
/* Publically exported function, documented in include/libnslayout/nslayout.h */
nslayout_error nslayout_fini(void)
{
return nsl_dom_str_fini();
}
/**
* Callback function for dom modifications.
*
* \param[in] type The mutation type.
* \param[in] node The target node. (Caller yields ownership.)
* \param[in] node_type The type of node.
* \param[in] pw The layout object.
* \return NSLAYOUT_OK on success, appropriate error otherwise.
*/
static nslayout_error nsl_layout_dom_watcher_cb(
enum nsl_dom_watcher_type type,
dom_event_target *node,
dom_node_type node_type,
void *pw)
{
nslayout_layout *layout = pw;
UNUSED(type);
UNUSED(layout);
UNUSED(node_type);
/* TODO: Based on event type:
* 1. call to do (re)selection:
* a. all nodes?
* b. just this node?
* 2. call to update layout, if needed.
*/
dom_node_unref(node);
return NSLAYOUT_OK;
}
/* Publically exported function, documented in include/libnslayout/nslayout.h */
nslayout_error nslayout_layout_create(
dom_document *doc,
css_select_ctx *css_ctx,
css_media_type *media,
nslayout_callback cb,
void *pw,
nslayout_layout **layout)
{
nslayout_layout *l = NULL;
nslayout_error err;
assert(doc != NULL);
assert(css_ctx != NULL);
assert(media != NULL);
assert(cb != NULL);
l = calloc(1, sizeof(nslayout_layout));
if (l == NULL) {
return NSLAYOUT_NO_MEM;
}
/* TODO: Decide: ownership will probably be passed to libnslayout */
l->document = doc;
l->css_ctx = css_ctx;
l->media = media;
l->cb = cb;
l->pw = pw;
err = nsl_dom_watcher_create(&l->watcher, l->document,
nsl_layout_dom_watcher_cb, l);
if (err != NSLAYOUT_OK) {
return err;
}
*layout = l;
return NSLAYOUT_OK;
}
/* Publically exported function, documented in include/libnslayout/nslayout.h */
nslayout_error nslayout_layout_destroy(
nslayout_layout *layout)
{
nslayout_error err;
assert(layout != NULL);
/* TODO: free/unref the stuff we own in the layout */
err = nsl_dom_watcher_destroy(layout->watcher);
if (err != NSLAYOUT_OK) {
return err;
}
free(layout);
return NSLAYOUT_OK;
}
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