view.c

elinks下lynx是最重要的二个文本浏览器, 在linux下非常实用, elinks也是gentoo安装过程中默认使用的浏览器, 这是elinks源代码

		}

		if (x < scrollmargin * 2) {
			return scroll_mouse_left(ses, doc_view);
		}
		if (x >= doc_view->box.width - scrollmargin * 2) {
			return scroll_mouse_right(ses, doc_view);
		}

		return FRAME_EVENT_OK;
	}

	return FRAME_EVENT_IGNORED;
}
#endif /* CONFIG_MOUSE */

static enum frame_event_status
frame_ev(struct session *ses, struct document_view *doc_view, struct term_event *ev)
{
	assertm(doc_view && doc_view->document, "document not formatted");
	if_assert_failed return FRAME_EVENT_IGNORED;

	assert(ses && ev);
	if_assert_failed return FRAME_EVENT_IGNORED;

	/* When changing frame, vs may be NULL. See bug 525. */
	if (!doc_view->vs) return FRAME_EVENT_IGNORED;

	switch (ev->ev) {
	case EVENT_KBD:
		return frame_ev_kbd(ses, doc_view, ev);
#ifdef CONFIG_MOUSE
	case EVENT_MOUSE:
		return frame_ev_mouse(ses, doc_view, ev);
#endif /* CONFIG_MOUSE */
	default:
		return FRAME_EVENT_IGNORED;
	}
}

struct document_view *
current_frame(struct session *ses)
{
	struct document_view *doc_view = NULL;
	int current_frame_number;

	assert(ses);
	if_assert_failed return NULL;

	if (!have_location(ses)) return NULL;

	current_frame_number = cur_loc(ses)->vs.current_link;
	if (current_frame_number == -1) current_frame_number = 0;

	foreach (doc_view, ses->scrn_frames) {
		if (document_has_frames(doc_view->document)) continue;
		if (!current_frame_number--) return doc_view;
	}

	doc_view = ses->doc_view;

	assert(doc_view && doc_view->document);
	if_assert_failed return NULL;

	if (document_has_frames(doc_view->document)) return NULL;
	return doc_view;
}

static enum frame_event_status
send_to_frame(struct session *ses, struct document_view *doc_view,
	      struct term_event *ev)
{
	enum frame_event_status status;

	assert(ses && ses->tab && ses->tab->term && ev);
	if_assert_failed return FRAME_EVENT_IGNORED;

	status = frame_ev(ses, doc_view, ev);

	if (status == FRAME_EVENT_REFRESH)
		refresh_view(ses, doc_view, 0);
	else
		print_screen_status(ses);

	return status;
}

#ifdef CONFIG_MOUSE
static int
do_mouse_event(struct session *ses, struct term_event *ev,
	       struct document_view *doc_view)
{
	struct term_event evv;
	struct document_view *matched = NULL, *first = doc_view;

	assert(ses && ev);
	if_assert_failed return 0;

	if (!doc_view) return 0;

	do {
		assert(doc_view && doc_view->document);
		if_assert_failed return 0;

		assertm(doc_view->document->options.box.x == doc_view->box.x
		        && doc_view->document->options.box.y == doc_view->box.y,
			"Jonas' 1.565 -> 1.566 patch sucks");
		if_assert_failed return 0;

		if (check_mouse_position(ev, &doc_view->box)) {
			matched = doc_view;
			break;
		}

		next_frame(ses, 1);
		doc_view = current_frame(ses);

	} while (doc_view != first);

	if (!matched) return 0;

	if (doc_view != first) draw_formatted(ses, 0);

	set_mouse_term_event(&evv,
			     ev->info.mouse.x - doc_view->box.x,
			     ev->info.mouse.y - doc_view->box.y,
			     ev->info.mouse.button);

	return send_to_frame(ses, doc_view, &evv);
}

/* Returns the session if event cleanup should be done or NULL if no cleanup is
 * needed. */
static struct session *
send_mouse_event(struct session *ses, struct document_view *doc_view,
		 struct term_event *ev)
{
	struct terminal *term = ses->tab->term;
	struct term_event_mouse *mouse = &ev->info.mouse;

	if (mouse->y == 0
	    && check_mouse_action(ev, B_DOWN)
	    && !check_mouse_wheel(ev)) {
		struct window *m;

		activate_bfu_technology(ses, -1);
		m = term->windows.next;
		m->handler(m, ev);

		return ses;
	}

	/* Handle tabs navigation if tabs bar is displayed. */
	if (ses->status.show_tabs_bar
	    && mouse->y == term->height - 1 - !!ses->status.show_status_bar) {
		int tab_num = get_tab_number_by_xpos(term, mouse->x);
		struct window *tab = get_current_tab(term);

		if (check_mouse_action(ev, B_UP)) {
			if (check_mouse_button(ev, B_MIDDLE)
			    && term->current_tab == tab_num
			    && mouse->y == term->prev_mouse_event.y) {
				if (tab->data == ses) ses = NULL;

				close_tab(term, tab->data);
			}

			return ses;
		}

		if (check_mouse_button(ev, B_WHEEL_UP)) {
			switch_current_tab(ses, -1);

		} else if (check_mouse_button(ev, B_WHEEL_DOWN)) {
			switch_current_tab(ses, 1);

		} else if (tab_num != -1) {
			switch_to_tab(term, tab_num, -1);

			if (check_mouse_button(ev, B_MIDDLE)) {
				do_not_ignore_next_mouse_event(term);
			} else if (check_mouse_button(ev, B_RIGHT)) {
				tab_menu(tab->data, mouse->x, mouse->y, 1);
			}
		}

		return ses;
	}

	if (!do_mouse_event(ses, ev, doc_view)
	    && check_mouse_button(ev, B_RIGHT)) {
		tab_menu(ses, mouse->x, mouse->y, 0);
		return NULL;
	}

#ifdef CONFIG_LEDS
	if (ses->status.show_leds
	    && mouse->y == term->height - 1
	    && mouse->x >= term->width - LEDS_COUNT - 3) {
		menu_leds_info(term, NULL, NULL);
		return NULL;
	}
#endif

	return NULL;
}
#endif /* CONFIG_MOUSE */

static void
try_typeahead(struct session *ses, struct document_view *doc_view,
              struct term_event *ev, enum main_action action_id)
{
	switch (get_opt_int("document.browse.search.typeahead")) {
		case 0:
			return;
		case 1:
			action_id = ACT_MAIN_SEARCH_TYPEAHEAD_LINK;
			break;
		case 2:
			action_id = ACT_MAIN_SEARCH_TYPEAHEAD_TEXT;
			break;
		default:
			INTERNAL("invalid value for document.browse.search.typeahead");
	}

	search_typeahead(ses, doc_view, action_id);

	/* Cross your fingers -- I'm just asking
	 * for an infinite loop! -- Miciah */
	term_send_event(ses->tab->term, ev);
}

/* Returns the session if event cleanup should be done or NULL if no cleanup is
 * needed. */
static struct session *
send_kbd_event(struct session *ses, struct document_view *doc_view,
	       struct term_event *ev)
{
	int event;
	enum main_action action_id;

	if (doc_view && send_to_frame(ses, doc_view, ev) != FRAME_EVENT_IGNORED)
		return NULL;

	action_id = kbd_action(KEYMAP_MAIN, ev, &event);

	if (action_id == ACT_MAIN_QUIT) {
		if (check_kbd_key(ev, KBD_CTRL_C))
quit:
			action_id = ACT_MAIN_REALLY_QUIT;
	}

	switch (do_action(ses, action_id, 0)) {
		case FRAME_EVENT_SESSION_DESTROYED:
			return NULL;
		case FRAME_EVENT_IGNORED:
			break;
		case FRAME_EVENT_OK:
		case FRAME_EVENT_REFRESH:
			return ses;
	}

	if (action_id == ACT_MAIN_SCRIPTING_FUNCTION) {
#ifdef CONFIG_SCRIPTING
		trigger_event(event, ses);
#endif
		return NULL;
	}

	if (check_kbd_key(ev, KBD_CTRL_C)) goto quit;

	if (get_kbd_modifier(ev) & KBD_MOD_ALT) {
		struct window *win;

		get_kbd_modifier(ev) &= ~KBD_MOD_ALT;
		activate_bfu_technology(ses, -1);
		win = ses->tab->term->windows.next;
		win->handler(win, ev);
		if (ses->tab->term->windows.next == win) {
			delete_window(win);
			get_kbd_modifier(ev) |= KBD_MOD_ALT;

			return NULL;
		}

		if (doc_view
		    && get_opt_int("document.browse.accesskey"
				   ".priority") <= 0
		    && try_document_key(ses, doc_view, ev)
		       == FRAME_EVENT_REFRESH) {
			/* The document ate the key! */
			refresh_view(ses, doc_view, 0);

			return NULL;
		}

		return ses;
	}

	if (!(get_kbd_modifier(ev) & KBD_MOD_CTRL)) {
		if (doc_view) try_typeahead(ses, doc_view, ev, action_id);
	}

	return NULL;
}

void
send_event(struct session *ses, struct term_event *ev)
{
	assert(ses && ev);
	if_assert_failed return;

	if (ev->ev == EVENT_KBD) {
		struct document_view *doc_view = current_frame(ses);

		ses = send_kbd_event(ses, doc_view, ev);
	}
#ifdef CONFIG_MOUSE
	else if (ev->ev == EVENT_MOUSE) {
		struct document_view *doc_view = current_frame(ses);

		ses = send_mouse_event(ses, doc_view, ev);
	}
#endif /* CONFIG_MOUSE */

	/* @ses may disappear ie. in close_tab() */
	if (ses) ses->kbdprefix.repeat_count = 0;
}

enum frame_event_status
download_link(struct session *ses, struct document_view *doc_view,
	      action_id_T action_id)
{
	struct link *link = get_current_link(doc_view);
	void (*download)(void *ses, unsigned char *file) = start_download;

	if (!link) return FRAME_EVENT_OK;

	if (ses->download_uri) {
		done_uri(ses->download_uri);
		ses->download_uri = NULL;
	}

	switch (action_id) {
		case ACT_MAIN_LINK_DOWNLOAD_RESUME:
			download = resume_download;
		case ACT_MAIN_LINK_DOWNLOAD:
			ses->download_uri = get_link_uri(ses, doc_view, link);
			break;

		case ACT_MAIN_LINK_DOWNLOAD_IMAGE:
			if (!link->where_img) break;
			ses->download_uri = get_uri(link->where_img, 0);
			break;

		default:
			INTERNAL("I think you forgot to take your medication, mental boy!");
			return FRAME_EVENT_OK;
	}

	if (!ses->download_uri) return FRAME_EVENT_OK;

	set_session_referrer(ses, doc_view->document->uri);
	query_file(ses, ses->download_uri, ses, download, NULL, 1);

	return FRAME_EVENT_OK;
}

enum frame_event_status
view_image(struct session *ses, struct document_view *doc_view, int xxxx)
{
	struct link *link = get_current_link(doc_view);

	if (link && link->where_img)
		goto_url(ses, link->where_img);

	return FRAME_EVENT_OK;
}

enum frame_event_status
save_as(struct session *ses, struct document_view *doc_view, int magic)
{
	assert(ses);
	if_assert_failed return FRAME_EVENT_OK;

	if (!have_location(ses)) return FRAME_EVENT_OK;

	if (ses->download_uri) done_uri(ses->download_uri);
	ses->download_uri = get_uri_reference(cur_loc(ses)->vs.uri);

	assert(doc_view && doc_view->document && doc_view->document->uri);
	if_assert_failed return FRAME_EVENT_OK;

	set_session_referrer(ses, doc_view->document->uri);
	query_file(ses, ses->download_uri, ses, start_download, NULL, 1);

	return FRAME_EVENT_OK;
}

static void
save_formatted_finish(struct terminal *term, int h, void *data, int resume)
{
	struct document *document = data;

	assert(term && document);
	if_assert_failed return;

	if (h == -1) return;
	if (dump_to_file(document, h)) {
		info_box(term, 0, N_("Save error"), ALIGN_CENTER,
			 N_("Error writing to file"));
	}
	close(h);
}

static void
save_formatted(void *data, unsigned char *file)
{
	struct session *ses = data;
	struct document_view *doc_view;

	assert(ses && ses->tab && ses->tab->term && file);
	if_assert_failed return;
	doc_view = current_frame(ses);
	assert(doc_view && doc_view->document);
	if_assert_failed return;

	create_download_file(ses->tab->term, file, NULL, 0, 0,
			     save_formatted_finish, doc_view->document);
}

enum frame_event_status
save_formatted_dlg(struct session *ses, struct document_view *doc_view, int xxxx)
{
	query_file(ses, doc_view->vs->uri, ses, save_formatted, NULL, 1);
	return FRAME_EVENT_OK;
}