quyse/flaw

// register input events
function h$flaw_input_register_events(canvas
    , keydownCallback
    , keyupCallback
    , keypressCallback
    , mousedownCallback
    , mouseupCallback
    , rawMouseMoveCallback
    , cursorMoveCallback
    ) {
    document.addEventListener('keydown', function(e) {
        keydownCallback(e.which);
    }, false);
    document.addEventListener('keyup', function(e) {
        keyupCallback(e.which);
    }, false);
    document.addEventListener('keypress', function(e) {
        keypressCallback(e.which);
    }, false);
    canvas.addEventListener('mousedown', function(e) {
        mousedownCallback(e.button);
    }, false);
    canvas.addEventListener('mouseup', function(e) {
        mouseupCallback(e.button);
    }, false);

    var lastCursorX = undefined, lastCursorY = undefined;
    canvas.addEventListener('mousemove', function(e) {
        var movementX = e.movementX || 0;
        var movementY = e.movementY || 0;
        var cursorX = e.clientX;
        var cursorY = e.clientY;
        if(movementX != 0 || movementY != 0) {
            rawMouseMoveCallback(movementX, movementY, 0);
        }
        if(cursorX != lastCursorX || cursorY != lastCursorY) {
            cursorMoveCallback(cursorX, cursorY);
            lastCursorX = cursorX;
            lastCursorY = cursorY;
        }
    }, false);

    canvas.addEventListener('wheel', function(e) {
        var movementZ = e.wheelDelta || ((e.deltaY || 0) * 40);
        if(movementZ != 0) {
            rawMouseMoveCallback(0, 0, movementZ);
        }
    }, false);
}