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drafts: Refactor keyboard functions for reusability.

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This is a preparatory commit to implement keyboard navigation in the
 message scheduling modal. The main goal is to make the
 `modals_handle_events` function reusable. To achieve this, we have
 extracted all the context-related variables and replaced all
 mentions of "draft" with the more neutral term "item". The
 `modals_handle_events` function now also has a context parameter,
 which contains all the necessary methods and properties to work in
 different modal contexts.
This commit is contained in:
Daniil Fadeev
2023-05-12 13:02:42 +04:00
committed by Tim Abbott
parent 0117d751c2
commit 35c23d0269
3 changed files with 148 additions and 105 deletions
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257
web/src/drafts.js
View File

@@ -415,14 +415,14 @@ export function format_draft(draft) {
return formatted;
}
function row_with_focus() {
const focused_draft = $(".draft-info-box:focus")[0];
return $(focused_draft).parent(".draft-row");
function row_with_focus(context) {
const focused_item = $(`.${CSS.escape(context.box_item_selector)}:focus`)[0];
return $(focused_item).parent(`.${CSS.escape(context.row_item_selector)}`);
}
function row_before_focus() {
const $focused_row = row_with_focus();
const $prev_row = $focused_row.prev(".draft-row:visible");
function row_before_focus(context) {
const $focused_row = row_with_focus(context);
const $prev_row = $focused_row.prev(`.${CSS.escape(context.row_item_selector)}:visible`);
// The draft modal can have two sub-sections. This handles the edge case
// when the user moves from the second "Other drafts" section to the first
// section which contains drafts from a particular narrow.
@@ -437,9 +437,9 @@ function row_before_focus() {
return $prev_row;
}
function row_after_focus() {
const $focused_row = row_with_focus();
const $next_row = $focused_row.next(".draft-row:visible");
function row_after_focus(context) {
const $focused_row = row_with_focus(context);
const $next_row = $focused_row.next(`.${CSS.escape(context.row_item_selector)}:visible`);
// The draft modal can have two sub-sections. This handles the edge case
// when the user moves from the first section (drafts from a particular
// narrow) to the second section which contains the rest of the drafts.
@@ -556,6 +556,44 @@ function filter_drafts_by_compose_box_and_recipient(drafts) {
return _.pick(drafts, narrow_drafts_ids);
}
const keyboard_handling_context = {
get_items_ids() {
const draft_arrow = draft_model.get();
return Object.getOwnPropertyNames(draft_arrow);
},
on_enter() {
// This handles when pressing Enter while looking at drafts.
// It restores draft that is focused.
const draft_id_arrow = this.get_items_ids();
const focused_draft_id = get_focused_element_id(this);
if (Object.hasOwn(document.activeElement.parentElement.dataset, "draftId")) {
restore_draft(focused_draft_id);
} else {
const first_draft = draft_id_arrow.at(-1);
restore_draft(first_draft);
}
},
on_delete() {
// Allows user to delete drafts with Backspace
const focused_element_id = get_focused_element_id(this);
if (focused_element_id === undefined) {
return;
}
const $focused_row = row_with_focus(this);
focus_on_sibling_element(this);
remove_draft($focused_row);
},
items_container_selector: "drafts-container",
items_list_selector: "drafts-list",
row_item_selector: "draft-row",
box_item_selector: "draft-info-box",
id_attribute_name: "data-draft-id",
};
export function handle_keyboard_events(e, event_key) {
modals_handle_events(e, event_key, keyboard_handling_context);
}
export function launch() {
function format_drafts(data) {
for (const [id, draft] of Object.entries(data)) {
@@ -651,138 +689,145 @@ export function launch() {
$("#draft_overlay").css("opacity");
open_overlay();
set_initial_element([...formatted_narrow_drafts, ...formatted_other_drafts]);
const first_element_id = [...formatted_narrow_drafts, ...formatted_other_drafts][0]?.draft_id;
set_initial_element(first_element_id, keyboard_handling_context);
setup_event_handlers();
}
function activate_element(elem) {
$(".draft-info-box").removeClass("active");
function activate_element(elem, context) {
$(`.${CSS.escape(context.box_item_selector)}`).removeClass("active");
$(elem).expectOne().addClass("active");
elem.focus();
}
function drafts_initialize_focus(event_name) {
// If a draft is not focused in draft modal, then focus the last draft
// if up_arrow is clicked or the first draft if down_arrow is clicked.
function initialize_focus(event_name, context) {
// If an item is not focused in modal, then focus the last item
// if up_arrow is clicked or the first item if down_arrow is clicked.
if (
(event_name !== "up_arrow" && event_name !== "down_arrow") ||
$(".draft-info-box:focus")[0]
$(`.${CSS.escape(context.box_item_selector)}:focus`)[0]
) {
return;
}
const draft_arrow = draft_model.get();
const draft_id_arrow = Object.getOwnPropertyNames(draft_arrow);
if (draft_id_arrow.length === 0) {
// empty drafts modal
const modal_items_ids = context.get_items_ids();
if (modal_items_ids.length === 0) {
// modal is empty
return;
}
let draft_element;
if (event_name === "up_arrow") {
draft_element = document.querySelectorAll(
'[data-draft-id="' + draft_id_arrow.at(-1) + '"]',
);
} else if (event_name === "down_arrow") {
draft_element = document.querySelectorAll('[data-draft-id="' + draft_id_arrow[0] + '"]');
}
const focus_element = draft_element[0].children[0];
let element;
activate_element(focus_element);
function get_last_element() {
const last_id = modal_items_ids.at(-1);
return get_element_by_id(last_id, context);
}
function get_first_element() {
const first_id = modal_items_ids[0];
return get_element_by_id(first_id, context);
}
if (event_name === "up_arrow") {
element = get_last_element();
} else if (event_name === "down_arrow") {
element = get_first_element();
}
const focus_element = element[0].children[0];
activate_element(focus_element, context);
}
function drafts_scroll($next_focus_draft_row) {
if ($next_focus_draft_row[0] === undefined) {
function scroll_to_element($element, context) {
if ($element[0] === undefined) {
return;
}
if ($next_focus_draft_row[0].children[0] === undefined) {
if ($element[0].children[0] === undefined) {
return;
}
activate_element($next_focus_draft_row[0].children[0]);
activate_element($element[0].children[0], context);
// If focused draft is first draft, scroll to the top.
if ($(".draft-info-box").first()[0].parentElement === $next_focus_draft_row[0]) {
$(".drafts-list")[0].scrollTop = 0;
const $items_list = $(`.${CSS.escape(context.items_list_selector)}`);
const $items_container = $(`.${CSS.escape(context.items_container_selector)}`);
const $box_item = $(`.${CSS.escape(context.box_item_selector)}`);
// If focused element is first, scroll to the top.
if ($box_item.first()[0].parentElement === $element[0]) {
$items_list[0].scrollTop = 0;
}
// If focused draft is the last draft, scroll to the bottom.
if ($(".draft-info-box").last()[0].parentElement === $next_focus_draft_row[0]) {
$(".drafts-list")[0].scrollTop =
$(".drafts-list")[0].scrollHeight - $(".drafts-list").height();
// If focused element is last, scroll to the bottom.
if ($box_item.last()[0].parentElement === $element[0]) {
$items_list[0].scrollTop = $items_list[0].scrollHeight - $items_list.height();
}
// If focused draft is cut off from the top, scroll up halfway in draft modal.
if ($next_focus_draft_row.position().top < 55) {
// If focused element is cut off from the top, scroll up halfway in modal.
if ($element.position().top < 55) {
// 55 is the minimum distance from the top that will require extra scrolling.
$(".drafts-list")[0].scrollTop -= $(".drafts-list")[0].clientHeight / 2;
$items_list[0].scrollTop -= $items_list[0].clientHeight / 2;
}
// If focused draft is cut off from the bottom, scroll down halfway in draft modal.
const dist_from_top = $next_focus_draft_row.position().top;
const total_dist = dist_from_top + $next_focus_draft_row[0].clientHeight;
const dist_from_bottom = $(".drafts-container")[0].clientHeight - total_dist;
// If focused element is cut off from the bottom, scroll down halfway in modal.
const dist_from_top = $element.position().top;
const total_dist = dist_from_top + $element[0].clientHeight;
const dist_from_bottom = $items_container[0].clientHeight - total_dist;
if (dist_from_bottom < -4) {
// -4 is the min dist from the bottom that will require extra scrolling.
$(".drafts-list")[0].scrollTop += $(".drafts-list")[0].clientHeight / 2;
$items_list[0].scrollTop += $items_list[0].clientHeight / 2;
}
}
export function drafts_handle_events(e, event_key) {
const draft_arrow = draft_model.get();
const draft_id_arrow = Object.getOwnPropertyNames(draft_arrow);
drafts_initialize_focus(event_key);
function get_element_by_id(id, context) {
return $(`[${context.id_attribute_name}='${id}']`);
}
// This detects up arrow key presses when the draft overlay
// is open and scrolls through the drafts.
if (event_key === "up_arrow" || event_key === "vim_up") {
drafts_scroll(row_before_focus());
function get_focused_element_id(context) {
return row_with_focus(context).attr(context.id_attribute_name);
}
function focus_on_sibling_element(context) {
const $next_row = row_after_focus(context);
const $prev_row = row_before_focus(context);
let elem_to_be_focused_id;
// Try to get the next item in the list and 'focus' on it.
// Use previous item as a fallback.
if ($next_row[0] !== undefined) {
elem_to_be_focused_id = $next_row.attr(context.id_attribute_name);
} else if ($prev_row[0] !== undefined) {
elem_to_be_focused_id = $prev_row.attr(context.id_attribute_name);
}
// This detects down arrow key presses when the draft overlay
// is open and scrolls through the drafts.
if (event_key === "down_arrow" || event_key === "vim_down") {
drafts_scroll(row_after_focus());
}
const focused_draft_id = row_with_focus().data("draft-id");
// Allows user to delete drafts with Backspace
if ((event_key === "backspace" || event_key === "delete") && focused_draft_id !== undefined) {
const $draft_row = row_with_focus();
const $next_draft_row = row_after_focus();
const $prev_draft_row = row_before_focus();
let draft_to_be_focused_id;
// Try to get the next draft in the list and 'focus' it
// Use previous draft as a fallback
if ($next_draft_row[0] !== undefined) {
draft_to_be_focused_id = $next_draft_row.data("draft-id");
} else if ($prev_draft_row[0] !== undefined) {
draft_to_be_focused_id = $prev_draft_row.data("draft-id");
}
const new_focus_element = document.querySelectorAll(
'[data-draft-id="' + draft_to_be_focused_id + '"]',
);
const new_focus_element = get_element_by_id(elem_to_be_focused_id, context);
if (new_focus_element[0] !== undefined) {
activate_element(new_focus_element[0].children[0]);
}
remove_draft($draft_row);
}
// This handles when pressing Enter while looking at drafts.
// It restores draft that is focused.
if (event_key === "enter") {
if (Object.hasOwn(document.activeElement.parentElement.dataset, "draftId")) {
restore_draft(focused_draft_id);
} else {
const first_draft = draft_id_arrow.at(-1);
restore_draft(first_draft);
}
activate_element(new_focus_element[0].children[0], context);
}
}
export function open_overlay() {
function modals_handle_events(e, event_key, context) {
initialize_focus(event_key, context);
// This detects up arrow key presses when the overlay
// is open and scrolls through.
if (event_key === "up_arrow" || event_key === "vim_up") {
scroll_to_element(row_before_focus(context), context);
}
// This detects down arrow key presses when the overlay
// is open and scrolls through.
if (event_key === "down_arrow" || event_key === "vim_down") {
scroll_to_element(row_after_focus(context), context);
}
if (event_key === "backspace" || event_key === "delete") {
context.on_delete();
}
if (event_key === "enter") {
context.on_enter();
}
}
function open_overlay() {
overlays.open_overlay({
name: "drafts",
$overlay: $("#draft_overlay"),
@@ -792,14 +837,12 @@ export function open_overlay() {
});
}
export function set_initial_element(drafts) {
if (drafts.length > 0) {
const curr_draft_id = drafts[0].draft_id;
const selector = '[data-draft-id="' + curr_draft_id + '"]';
const curr_draft_element = document.querySelectorAll(selector);
const focus_element = curr_draft_element[0].children[0];
activate_element(focus_element);
$(".drafts-list")[0].scrollTop = 0;
function set_initial_element(element_id, context) {
if (element_id) {
const current_element = get_element_by_id(element_id, context);
const focus_element = current_element[0].children[0];
activate_element(focus_element, keyboard_handling_context);
$(`.${CSS.escape(context.items_list_selector)}`)[0].scrollTop = 0;
}
}
@@ -817,6 +860,6 @@ export function initialize() {
set_count(Object.keys(draft_model.get()).length);
$("body").on("focus", ".draft-info-box", (e) => {
activate_element(e.target);
activate_element(e.target, keyboard_handling_context);
});
}

4
web/src/hotkey.js
View File

@@ -443,7 +443,7 @@ export function process_enter_key(e) {
// This handles when pressing Enter while looking at drafts.
// It restores draft that is focused.
if (overlays.drafts_open()) {
drafts.drafts_handle_events(e, "enter");
drafts.handle_keyboard_events(e, "enter");
return true;
}
@@ -650,7 +650,7 @@ export function process_hotkey(e, hotkey) {
case "backspace":
case "delete":
if (overlays.drafts_open()) {
drafts.drafts_handle_events(e, event_name);
drafts.handle_keyboard_events(e, event_name);
return true;
}
}

4
web/tests/hotkey.test.js
View File

@@ -524,8 +524,8 @@ run_test("motion_keys", () => {
delete overlays.is_active;
overlays.drafts_open = () => true;
assert_mapping("up_arrow", drafts, "drafts_handle_events");
assert_mapping("down_arrow", drafts, "drafts_handle_events");
assert_mapping("up_arrow", drafts, "handle_keyboard_events");
assert_mapping("down_arrow", drafts, "handle_keyboard_events");
delete overlays.is_active;
delete overlays.drafts_open;
});