MediaWiki:Gadget-SelectionCounter.js：修订间差异

/* ================================================================

MediaWiki Gadget: SelectionCounter

功能：

- 选中文本时显示字数统计

- 与 RightToolbar 风格一致

================================================================= */

mw.loader.using(['mediawiki.util']).then(function () {

if (window.SelectionCounterLoaded) {

return;

}

window.SelectionCounterLoaded = true;

$(function () {

var $counter = $('#mw-selection-counter');

if (!$counter.length) {

$counter = $('<div id="mw-selection-counter" class="mw-selection-counter" role="status" aria-live="polite"></div>')

.hide()

.appendTo('body');

}

var rafId = null;

var pollTimer = null;

var lastText = null;

function getSelectionText() {

var selection = window.getSelection();

if (!selection || selection.rangeCount === 0 || selection.isCollapsed) {

return '';

}

return selection.toString();

}

function updateCounter() {

rafId = null;

var text = getSelectionText();

if (!text) {

if (lastText !== null) {

lastText = null;

$counter.hide();

}

return;

}

var compact = text.replace(/\s+/g, '');

if (!compact) {

if (lastText !== null) {

lastText = null;

$counter.hide();

}

return;

}

if (text === lastText) {

return;

}

lastText = text;

var count = Array.from(compact).length;

$counter.text('已选 ' + count + ' 字').show();

}

function scheduleUpdate() {

if (rafId) {

return;

}

rafId = window.requestAnimationFrame(updateCounter);

}

function scheduleUpdateDelayed() {

window.setTimeout(scheduleUpdate, 0);

}

function startPolling() {

if (pollTimer) {

return;

}

pollTimer = window.setInterval(updateCounter, 500);

}

function stopPolling() {

if (!pollTimer) {

return;

}

window.clearInterval(pollTimer);

pollTimer = null;

}

document.addEventListener('selectionchange', scheduleUpdate);

document.addEventListener('mouseup', scheduleUpdateDelayed, true);

document.addEventListener('mouseup', scheduleUpdateDelayed);

document.addEventListener('keyup', scheduleUpdate);

document.addEventListener('touchend', scheduleUpdateDelayed, { passive: true, capture: true });

document.addEventListener('pointerup', scheduleUpdateDelayed, true);

window.addEventListener('focus', startPolling);

window.addEventListener('blur', stopPolling);

document.addEventListener('visibilitychange', function () {

if (document.hidden) {

stopPolling();

return;

}

startPolling();

});

startPolling();

});

});