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Enable/disable keyboard input on specific keys?

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Not sure if there is cleaner way to enable/disable keyboard input like for

buttons, button.inputEnabled = false/true,

but I created my own functions and used add/remove functions of the Phaser.Signal class:

initKeyboard: function() {
        aKey = gameObject.input.keyboard.addKey(phaser.Keyboard.A);
        aKey.onDown.add(this.guess, answer1Btn);

        leftKey = gameObject.input.keyboard.addKey(phaser.Keyboard.LEFT);
        leftKey.onDown.add(this.guess, answer1Btn);

        uKey = gameObject.input.keyboard.addKey(phaser.Keyboard.U);
        uKey.onDown.add(this.updateFields, this);

        pKey = gameObject.input.keyboard.addKey(phaser.Keyboard.P);
        pKey.onDown.add(this.pauseUnpauseGame, this);

        oKey = gameObject.input.keyboard.addKey(phaser.Keyboard.O);
        oKey.onDown.add(this.saveData, this);

        spaceKey = gameObject.input.keyboard.addKey(phaser.Keyboard.SPACEBAR);
        spaceKey.onDown.add(this.submit, this);

        enterKey = gameObject.input.keyboard.addKey(phaser.Keyboard.ENTER);
        enterKey.onDown.add(this.submit, this);

        iKey = gameObject.input.keyboard.addKey(phaser.Keyboard.I);
        iKey.onDown.add(this.showResetWindow, this);

    disableKeys: function() {
        aKey.onDown.remove(this.guess, answer1Btn);
        leftKey.onDown.remove(this.guess, answer1Btn);
        spaceKey.onDown.remove(this.submit, this);
        enterKey.onDown.remove(this.submit, this);
        uKey.onDown.remove(this.updateFields, this);

    enableKeys: function() {
        aKey.onDown.add(this.guess, answer1Btn);
        leftKey.onDown.add(this.guess, answer1Btn);
        spaceKey.onDown.add(this.submit, this);
        enterKey.onDown.add(this.submit, this);
        uKey.onDown.add(this.updateFields, this);


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