MediaWiki:Common.js

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(function () {
    var iconSelector =
        '.meter, .parallel, .commentary, .pictures, .outline, .comment, .word';

    var panelSelector =
        '.metertext, .paralleltext, .commentarytext, ' +
        '.picturestext, .outlinetext, .commenttext, .wordtext';

    function updateWidth(icon) {
        var viewportWidth = document.documentElement.clientWidth;
        var iconLeft = icon.getBoundingClientRect().left;
        var availableWidth = viewportWidth - iconLeft - 16;
        var popupWidth = Math.min(viewportWidth * 0.7, availableWidth);

        icon.style.setProperty(
            '--popup-width',
            Math.max(0, popupWidth) + 'px'
        );
    }

    function arrangePopups() {
        var openIcons = Array.prototype.filter.call(
            document.querySelectorAll(iconSelector),
            function (icon) {
                return icon.classList.contains('open');
            }
        );

        openIcons.forEach(function (icon) {
            icon.style.setProperty('--popup-offset', '0px');
            updateWidth(icon);
        });

        var placedPanels = [];

        openIcons.forEach(function (icon) {
            var panel = icon.querySelector(panelSelector);

            if (!panel) {
                return;
            }

            var panelRect = panel.getBoundingClientRect();
            var offset = 0;

            placedPanels.forEach(function (previousRect) {
                var overlapsHorizontally =
                    panelRect.left < previousRect.right &&
                    panelRect.right > previousRect.left;

                var overlapsVertically =
                    panelRect.top < previousRect.bottom &&
                    panelRect.bottom > previousRect.top;

                if (overlapsHorizontally && overlapsVertically) {
                    offset = Math.max(
                        offset,
                        previousRect.bottom - panelRect.top + 8
                    );
                }
            });

            icon.style.setProperty('--popup-offset', offset + 'px');

            placedPanels.push(panel.getBoundingClientRect());
        });
    }

    document.addEventListener('click', function (event) {
        var icon = event.target.closest(iconSelector);

        if (!icon) {
            return;
        }

        var panel = icon.querySelector(panelSelector);

        if (panel && panel.contains(event.target)) {
            return;
        }

        icon.classList.toggle('open');

        window.requestAnimationFrame(arrangePopups);
    });

    window.addEventListener('resize', function () {
        window.requestAnimationFrame(arrangePopups);
    });
})();