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function KeyboardInputManager() {
this.events = {};
if (window.navigator.msPointerEnabled) {
//Internet Explorer 10 style
this.eventTouchstart = "MSPointerDown";
this.eventTouchmove = "MSPointerMove";
this.eventTouchend = "MSPointerUp";
} else {
this.eventTouchstart = "touchstart";
this.eventTouchmove = "touchmove";
this.eventTouchend = "touchend";
}
this.listen();
}
KeyboardInputManager.prototype.on = function (event, callback) {
if (!this.events[event]) {
this.events[event] = [];
}
this.events[event].push(callback);
};
KeyboardInputManager.prototype.emit = function (event, data) {
var callbacks = this.events[event];
if (callbacks) {
callbacks.forEach(function (callback) {
callback(data);
});
}
};
KeyboardInputManager.prototype.listen = function () {
var self = this;
var map = {
38: 0, // Up
39: 1, // Right
40: 2, // Down
37: 3, // Left
75: 0, // Vim up
76: 1, // Vim right
74: 2, // Vim down
72: 3, // Vim left
87: 0, // W
68: 1, // D
83: 2, // S
65: 3 // A
};
// Respond to direction keys
document.addEventListener("keydown", function (event) {
var modifiers = event.altKey || event.ctrlKey || event.metaKey ||
event.shiftKey;
var mapped = map[event.which];
if (!modifiers) {
if (mapped !== undefined) {
event.preventDefault();
self.emit("move", mapped);
}
}
// R key restarts the game
if (!modifiers && event.which === 82) {
self.restart.call(self, event);
}
});
// Respond to button presses
this.bindButtonPress(".retry-button", this.restart);
this.bindButtonPress(".restart-button", this.restart);
this.bindButtonPress(".keep-playing-button", this.keepPlaying);
// Respond to swipe events
var touchStartClientX, touchStartClientY;
var gameContainer = document.getElementsByClassName("game-container")[0];
gameContainer.addEventListener(this.eventTouchstart, function (event) {
if ((!window.navigator.msPointerEnabled && event.touches.length > 1) ||
event.targetTouches.length > 1) {
return; // Ignore if touching with more than 1 finger
}
if (window.navigator.msPointerEnabled) {
touchStartClientX = event.pageX;
touchStartClientY = event.pageY;
} else {
touchStartClientX = event.touches[0].clientX;
touchStartClientY = event.touches[0].clientY;
}
event.preventDefault();
});
gameContainer.addEventListener(this.eventTouchmove, function (event) {
event.preventDefault();
});
gameContainer.addEventListener(this.eventTouchend, function (event) {
if ((!window.navigator.msPointerEnabled && event.touches.length > 0) ||
event.targetTouches.length > 0) {
return; // Ignore if still touching with one or more fingers
}
var touchEndClientX, touchEndClientY;
if (window.navigator.msPointerEnabled) {
touchEndClientX = event.pageX;
touchEndClientY = event.pageY;
} else {
touchEndClientX = event.changedTouches[0].clientX;
touchEndClientY = event.changedTouches[0].clientY;
}
var dx = touchEndClientX - touchStartClientX;
var absDx = Math.abs(dx);
var dy = touchEndClientY - touchStartClientY;
var absDy = Math.abs(dy);
if (Math.max(absDx, absDy) > 10) {
// (right : left) : (down : up)
self.emit("move", absDx > absDy ? (dx > 0 ? 1 : 3) : (dy > 0 ? 2 : 0));
}
});
};
KeyboardInputManager.prototype.restart = function (event) {
event.preventDefault();
this.emit("restart");
};
KeyboardInputManager.prototype.keepPlaying = function (event) {
event.preventDefault();
this.emit("keepPlaying");
};
KeyboardInputManager.prototype.bindButtonPress = function (selector, fn) {
var button = document.querySelector(selector);
button.addEventListener("click", fn.bind(this));
button.addEventListener(this.eventTouchend, fn.bind(this));
};
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