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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>
* Copyright 2015 John-Mark Bell <jmb@netsurf-browser.org>
*/
/** \file include/libnslayout/nslayout.h
* Layout object handling
*/
#ifndef nslayout_nslayout_h_
#define nslayout_nslayout_h_
#ifdef __cplusplus
extern "C"
{
#endif
#include <libcss/libcss.h>
#include <dom/dom.h>
#include <libnslayout/error.h>
/** An opaque client-owned replaced element */
typedef void nslayout_replaced;
/** A rectangle */
typedef struct nslayout_rect {
int x; /**< X position of left of rect in px */
int y; /**< Y position of top of rect in px */
int w; /**< Width of rect in px */
int h; /**< Height of rect in px */
} nslayout_rect;
/** Render list */
typedef struct nslayout_render_list {
} nslayout_render_list;
/** Render list */
typedef struct nslayout_layout nslayout_layout;
/**
* A LibNSLayout request
*
* Passed to the client via nslayout_callback
*/
typedef struct nslayout_request {
/** Request type */
enum {
NSLAYOUT_GET_RESOURCE,
NSLAYOUT_CREATE_REPLACED,
NSLAYOUT_RENDER,
NSLAYOUT_SET_EXTENTS,
NSLAYOUT_GET_INTRINSIC_SIZE
} type;
/** Request's type-specific parameters */
union {
struct {
const char *url; /**< Absolute URL */
} get_resource;
struct {
dom_element *element; /**< DOM element */
} create_replaced;
struct {
nslayout_render_list *list; /**< Render list */
} render;
struct {
unsigned int width; /**< Document width in px */
unsigned int height; /**< Document height in px */
} set_extents;
struct {
nslayout_replaced *replaced; /** A replacement object */
} get_intrinsic_size;
} request;
/** Request's type-specific return values */
union {
struct {
nslayout_replaced **replaced; /** Replacement object */
} get_resource;
struct {
nslayout_replaced **replaced; /** Replacement object */
} create_replaced;
struct {
unsigned int *width; /** Replacement object's width */
unsigned int *height; /** Replacement object's height */
} get_intrinsic_size;
} response;
} nslayout_request;
/**
* Initialise LibNSLayout
*
* \return NSLAYOUT_OK on success, appropriate error otherwise.
*/
nslayout_error nslayout_init(void);
/**
* Finalise LibNSLayout
*
* \return NSLAYOUT_OK on success, appropriate error otherwise.
*/
nslayout_error nslayout_fini(void);
/**
* LibNSLayout client callback function
*
* \param[in] layout The layout we're making a request for.
* \param[in] pw The client's private data for this layout.
* \param[in,out] req The request details.
* \return NSLAYOUT_OK on success, appropriate error otherwise.
*/
typedef nslayout_error (*nslayout_callback)(
nslayout_layout *layout,
void *pw,
nslayout_request *req);
/**
* Create a Layout object for a given DOM
*
* \param[in] doc The LibDOM document to build a layout for.
* \param[in] css_ctx The LibCSS selection context for the document.
* \param[in] media The LibCSS media to use when selecting.
* \param[in] cb The client's private data for this layout.
* \param[in] pw The client's private data for this layout.
* \param[out] layout Returns a pointer to the created layout object.
* \return NSLAYOUT_OK on success, appropriate error otherwise.
*/
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);
/**
* Destroy a Layout object
*
* \param[in] layout Returns a pointer to the created layout object.
* \return NSLAYOUT_OK on success, appropriate error otherwise.
*/
nslayout_error nslayout_layout_destroy(
nslayout_layout *layout);
/**
* Update the viewport for a layout
*
* Note: Before this is called, the layout engine will create internal
* data structures for the document, but will not start to position
* things and will not emit render lists.
*
* \param[in] layout Layout to set viewport for.
* \param[in] viewport Viewport dimensions and offset.
* \param[in] scale Rendering scale.
* \param[in] dpi DPI of render target with viewport.
* \return NSLAYOUT_OK on success, appropriate error otherwise.
*/
nslayout_error nslayout_update_viewport(
nslayout_layout *layout,
nslayout_rect *viewport,
css_fixed scale,
unsigned int dpi);
/**
* Find the area occupied by element.
*
* \param[in] layout Layout to locate an element in.
* \param[in] element Element to get area of.
* \param[out] area Returns area with position relative to viewport.
* \return NSLAYOUT_OK on success, appropriate error otherwise.
*/
nslayout_error nslayout_element_get_location(
nslayout_layout *layout,
dom_element *element,
nslayout_rect *area);
/**
* Find the top-most element at a given point, in terms of z-order.
*
* \param[in] layout Layout to find an element in.
* \param[in] x Mouse x-coordinate (viewport relative).
* \param[in] y Mouse y-coordinate (viewport relative).
* \param[out] element Returns the element we found.
* \return NSLAYOUT_OK on success, appropriate error otherwise.
*/
nslayout_error nslayout_element_at_point(
nslayout_layout *layout,
unsigned int x,
unsigned int y,
dom_event_target **element);
/**
* Mark an element (or part of it) as needing redraw.
*
* \param[in] layout Layout to indicate redraw is required for.
* \param[in] element Element to mark as needing redraw.
* \param[in] rel_area Area of element to redraw relative to object's top-left.
* May be NULL, to redraw whole element.
* \return NSLAYOUT_OK on success, appropriate error otherwise.
*/
nslayout_error nslayout_layout_dirty_element(
nslayout_layout *layout,
dom_element *element,
nslayout_rect *rel_area);
/**
* Mark an area as needing redraw.
*
* \param[in] layout Layout to indicate redraw is required for.
* \param[in] area Area to redraw relative to viewport's top-left.
* \return NSLAYOUT_OK on success, appropriate error otherwise.
*/
nslayout_error nslayout_layout_dirty_area(
nslayout_layout *layout,
nslayout_rect *area);
#ifdef __cplusplus
}
#endif
#endif
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