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window_listeners.js
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window_listeners.js
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function MG_WindowResizeTracker() {
var targets = [];
var Observer;
if (typeof MutationObserver !== "undefined") {
Observer = MutationObserver;
} else if (typeof WebKitMutationObserver !== "undefined") {
Observer = WebKitMutationObserver;
}
function window_listener() {
targets.forEach(function(target) {
var svg = d3.select(target).select('svg');
// skip if svg is not visible
if (!svg.empty() && (svg.node().parentNode.offsetWidth > 0 || svg.node().parentNode.offsetHeight > 0)) {
var aspect = svg.attr('width') !== 0 ? (svg.attr('height') / svg.attr('width')) : 0;
var newWidth = get_width(target);
svg.attr('width', newWidth);
svg.attr('height', aspect * newWidth);
}
});
}
function remove_target(target) {
var index = targets.indexOf(target);
if (index !== -1) {
targets.splice(index, 1);
}
if (targets.length === 0) {
window.removeEventListener('resize', window_listener, true);
}
}
return {
add_target: function(target) {
if (targets.length === 0) {
window.addEventListener('resize', window_listener, true);
}
if (targets.indexOf(target) === -1) {
targets.push(target);
if (Observer) {
var observer = new Observer(function(mutations) {
var targetNode = d3.select(target).node();
if (!targetNode || mutations.some(
function(mutation) {
for (var i = 0; i < mutation.removedNodes.length; i++) {
if (mutation.removedNodes[i] === targetNode) {
return true;
}
}
})) {
observer.disconnect();
remove_target(target);
}
});
observer.observe(d3.select(target).node().parentNode, { childList: true });
}
}
}
};
}
var mg_window_resize_tracker = new MG_WindowResizeTracker();
function mg_window_listeners(args) {
mg_if_aspect_ratio_resize_svg(args);
}
function mg_if_aspect_ratio_resize_svg(args) {
// have we asked the svg to fill a div, if so resize with div
if (args.full_width || args.full_height) {
mg_window_resize_tracker.add_target(args.target);
}
}

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