mirror of https://github.com/zulip/zulip.git
127 lines
3.9 KiB
JavaScript
127 lines
3.9 KiB
JavaScript
var navigate = (function () {
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var exports = {};
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function go_to_row(row) {
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current_msg_list.select_id(rows.id(row),
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{then_scroll: true,
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from_scroll: true});
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}
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exports.up = function () {
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viewport.last_movement_direction = -1;
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var next_row = rows.prev_visible(current_msg_list.selected_row());
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if (next_row.length !== 0) {
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go_to_row(next_row);
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}
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};
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exports.down = function (with_centering) {
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viewport.last_movement_direction = 1;
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var next_row = rows.next_visible(current_msg_list.selected_row());
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if (next_row.length !== 0) {
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go_to_row(next_row);
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}
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if (with_centering && (next_row.length === 0)) {
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// At the last message, scroll to the bottom so we have
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// lots of nice whitespace for new messages coming in.
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//
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// FIXME: this doesn't work for End because rows.last_visible()
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// always returns a message.
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var current_msg_table = rows.get_table(current_msg_list.table_name);
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viewport.scrollTop(current_msg_table.outerHeight(true) - viewport.height() * 0.1);
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unread.mark_current_list_as_read();
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}
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};
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exports.to_home = function () {
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viewport.last_movement_direction = -1;
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var next_row = rows.first_visible(current_msg_list.selected_row());
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if (next_row.length !== 0) {
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go_to_row(next_row);
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}
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};
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exports.to_end = function () {
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var next_id = current_msg_list.last().id;
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viewport.last_movement_direction = 1;
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current_msg_list.select_id(next_id, {then_scroll: true,
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from_scroll: true});
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unread.mark_current_list_as_read();
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};
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exports.page_up = function () {
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if (viewport.at_top() && !current_msg_list.empty()) {
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current_msg_list.select_id(current_msg_list.first().id, {then_scroll: false});
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}
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else {
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ui.page_up_the_right_amount();
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}
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};
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exports.page_down = function () {
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if (viewport.at_bottom() && !current_msg_list.empty()) {
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current_msg_list.select_id(current_msg_list.last().id, {then_scroll: false});
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unread.mark_current_list_as_read();
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}
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else {
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ui.page_down_the_right_amount();
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}
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};
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exports.cycle_stream = function (direction) {
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var currentStream, nextStream;
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if (narrow.stream() !== undefined) {
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currentStream = stream_list.get_stream_li(narrow.stream());
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}
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switch (direction) {
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case 'forward':
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if (narrow.stream() === undefined) {
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nextStream = $("#stream_filters").children('.narrow-filter').first();
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} else {
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nextStream = currentStream.next('.narrow-filter');
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if (nextStream.length === 0) {
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nextStream = $("#stream_filters").children('.narrow-filter').first();
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}
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}
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break;
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case 'backward':
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if (narrow.stream() === undefined) {
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nextStream = $("#stream_filters").children('.narrow-filter').last();
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} else {
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nextStream = currentStream.prev('.narrow-filter');
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if (nextStream.length === 0) {
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nextStream = $("#stream_filters").children('.narrow-filter').last();
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}
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}
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break;
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default:
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blueslip.error("Invalid parameter to cycle_stream", {value: direction});
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}
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narrow.by('stream', nextStream.data('name'));
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};
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exports.scroll_to_selected = function () {
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var selected_row = current_msg_list.selected_row();
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if (selected_row && (selected_row.length !== 0)) {
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viewport.recenter_view(selected_row);
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}
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};
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exports.maybe_scroll_to_selected = function () {
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// If we have been previously instructed to re-center to the
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// selected message, then do so
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if (pointer.recenter_pointer_on_display) {
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exports.scroll_to_selected();
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pointer.recenter_pointer_on_display = false;
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}
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};
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return exports;
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}());
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