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