46 lines
1.4 KiB
JavaScript
46 lines
1.4 KiB
JavaScript
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Elm.Native.Window = function(elm) {
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'use strict';
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elm.Native = elm.Native || {};
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if (elm.Native.Window) return elm.Native.Window;
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var Signal = Elm.Signal(elm);
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var Tuple2 = Elm.Native.Utils(elm).Tuple2;
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function getWidth() { return elm.node.clientWidth; }
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function getHeight() {
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if (elm.display === ElmRuntime.Display.FULLSCREEN) {
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return window.innerHeight;
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}
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return elm.node.clientHeight;
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}
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var dimensions = Signal.constant(Tuple2(getWidth(), getHeight()));
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dimensions.defaultNumberOfKids = 2;
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// Do not move width and height into Elm. By setting the default number of kids,
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// the resize listener can be detached.
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var width = A2(Signal.lift, function(p){return p._0;}, dimensions);
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width.defaultNumberOfKids = 0;
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var height = A2(Signal.lift, function(p){return p._1;}, dimensions);
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height.defaultNumberOfKids = 0;
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function resizeIfNeeded() {
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var w = getWidth();
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var h = getHeight();
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if (dimensions.value._0 === w && dimensions.value._1 === h) return;
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var hasListener = elm.notify(dimensions.id, Tuple2(w,h));
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if (!hasListener) window.removeEventListener('resize', resizeIfNeeded);
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}
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window.addEventListener('resize', resizeIfNeeded);
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return elm.Native.Window = {
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dimensions:dimensions,
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width:width,
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height:height,
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resizeIfNeeded:resizeIfNeeded
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};
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};
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