mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-12-29 15:29:42 +03:00
122 lines
3.0 KiB
Plaintext
122 lines
3.0 KiB
Plaintext
Rendering library
|
|
=================
|
|
|
|
General notes
|
|
-------------
|
|
|
|
+ Potentially long-running routines probably want to exit early and
|
|
ask to be resumed (or similar)
|
|
+ There's loads of stuff missing from here (like a typesystem :)
|
|
|
|
Possible API
|
|
------------
|
|
|
|
/* Initialise library */
|
|
error html_init(void);
|
|
/* Finalise library */
|
|
error html_fini(void);
|
|
|
|
/* Create a context */
|
|
ctx html_create(void);
|
|
/* Destroy a context */
|
|
void html_destroy(ctx);
|
|
|
|
/* Configure a context
|
|
*
|
|
* Things that need configuring:
|
|
*
|
|
* Callbacks from library -> client:
|
|
*
|
|
* + Handler for embedded object fetch requests (how to handle frames?)
|
|
* + Event notification handler (e.g. form submission / link navigation,
|
|
* mouse pointer shape changing, redraw request, position caret, etc)
|
|
*
|
|
* Other stuff:
|
|
*
|
|
* + Scale? (should this be handled by the client?)
|
|
* + Whether to run scripts? (possibly, not needed yet)
|
|
*/
|
|
error html_setopt(ctx, opttype, optparams);
|
|
|
|
/* Feed HTML data to a context */
|
|
error html_process_data(ctx, data, len);
|
|
/* Flag end of data to context */
|
|
error html_data_done(ctx);
|
|
|
|
/* Reflow context, to given width/height */
|
|
error html_reflow(ctx, width, height);
|
|
|
|
/* Redraw context, using provided plotters */
|
|
error html_redraw(ctx, rect, plot_table);
|
|
|
|
/* Some kind of input event notification APIs.
|
|
* These are called by the client to notify the library
|
|
* that something's happened.
|
|
*
|
|
* e.g.:
|
|
*/
|
|
error html_mouse_move(ctx, x, y);
|
|
error html_mouse_press(ctx, x, y, buttons, modifiers);
|
|
error html_mouse_release(ctx, x, y, buttons, modifiers);
|
|
error html_key_press(ctx, key, modifiers);
|
|
error html_key_release(ctx, key, modifiers);
|
|
error html_scroll_x(ctx, offset);
|
|
error html_scroll_y(ctx, offset);
|
|
|
|
/* Retrieve properties of document in context
|
|
*
|
|
* e.g.:
|
|
*/
|
|
error html_get_title(ctx, title);
|
|
|
|
Example usage
|
|
-------------
|
|
|
|
/* Main routine */
|
|
main:
|
|
/* Initialise library */
|
|
html_init();
|
|
|
|
/* Create a context */
|
|
ctx = html_create();
|
|
|
|
/* Configure the context */
|
|
html_setopt(ctx, FETCH_HANDLER, my_fetcher);
|
|
html_setopt(ctx, EVENT_HANDLER, my_event_handler);
|
|
|
|
/* Get it to process data */
|
|
foreach (chunk, len) in data:
|
|
html_process_data(ctx, chunk, len);
|
|
html_data_done(ctx);
|
|
|
|
/* Reflow content to desired dimensions */
|
|
html_reflow(ctx, width, height);
|
|
|
|
/* Main client event loop -- processes UI-toolkit events */
|
|
do:
|
|
on mouse event:
|
|
html_mouse_{move,press,release}(ctx, event.x, event.y ...);
|
|
on key event:
|
|
html_key_{press,release}{ctx, event.key, event.modifiers);
|
|
on scroll event:
|
|
html_scroll_{x,y}(ctx, event.offset);
|
|
on redraw event:
|
|
html_redraw(ctx, event.rect, my_plotters);
|
|
until quit;
|
|
|
|
/* Destroy context */
|
|
html_destroy(ctx);
|
|
|
|
/* Finalise library */
|
|
html_fini();
|
|
|
|
/* Event handler for library-generated events */
|
|
my_event_handler:
|
|
on pointer shape change:
|
|
set_pointer_shape(shape);
|
|
on redraw request:
|
|
redraw_window(window);
|
|
on position caret:
|
|
position caret(x, y);
|
|
|