88 lines
2.3 KiB
JavaScript
88 lines
2.3 KiB
JavaScript
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Elm.Keyboard = { Raw : function() {
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var keysDown = Elm.Signal.constant(["Nil"]);
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var charPressed = Elm.Signal.constant(["Nothing"]);
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function remove(x,xs) {
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if (xs[0] === "Nil") return xs;
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if (xs[1] === x) return xs[2];
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return ["Cons", xs[1], remove(x,xs[2])];
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}
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function has(x,xs) {
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while (xs[0] !== "Nil") {
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if (xs[1] === x) return true;
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xs = xs[2];
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}
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return false;
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}
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Value.addListener(document, 'keydown', function(e) {
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if (has(e.keyCode, keysDown.value)) return;
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var hasListener = Dispatcher.notify(keysDown.id, ["Cons", e.keyCode, keysDown.value]);
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if (!hasListener)
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this.removeEventListener('keydown',arguments.callee,false);
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});
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Value.addListener(document, 'keyup', function(e) {
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var codes = remove(e.keyCode, keysDown.value);
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var hasListener = Dispatcher.notify(keysDown.id, codes);
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if (!hasListener)
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this.removeEventListener('keyup',arguments.callee,false);
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});
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Value.addListener(window, 'blur', function(e) {
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var hasListener = Dispatcher.notify(keysDown.id, ["Nil"]);
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if (!hasListener)
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this.removeEventListener('blur',arguments.callee,false);
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});
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Value.addListener(document, 'keypress', function(e) {
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var hasListener = Dispatcher.notify(charPressed.id, ["Just",e.charCode || e.keyCode]);
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Dispatcher.notify(charPressed.id, ["Nothing"]);
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if (!hasListener)
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this.removeEventListener('keypress',arguments.callee,false);
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});
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return {keysDown:keysDown,
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charPressed:charPressed};
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}()
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};
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(function() {
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function keySignal(f) {
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var signal = Elm.Signal.lift(f)(Elm.Keyboard.Raw.keysDown);
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Elm.Keyboard.Raw.keysDown.defaultNumberOfKids += 1;
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signal.defaultNumberOfKids = 0;
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return signal;
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}
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function dir(left,right,up,down) {
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function f(ks) {
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var x = 0, y = 0;
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while (ks[0] == "Cons") {
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switch (ks[1]) {
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case left : --x; break;
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case right: ++x; break;
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case up : ++y; break;
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case down : --y; break;
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}
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ks = ks[2];
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}
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return { _:[true], x:[x], y:[y] };
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}
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return keySignal(f);
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}
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function is(key) {
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function f(ks) {
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while (ks[0] == "Cons") {
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if (key == ks[1]) return true;
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ks = ks[2];
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}
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return false;
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}
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return keySignal(f);
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}
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Elm.Keyboard.arrows = dir(37,39,38,40);
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Elm.Keyboard.wasd = dir(65,68,87,83);
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Elm.Keyboard.shift = is(16);
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Elm.Keyboard.ctrl = is(17);
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Elm.Keyboard.space = is(32);
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}());
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