Using mouse wheel to scroll in Sencha Touch application on desktop

Question

While looking for how to enable scrolling with the mouse wheel in Sencha Touch, I came across this answer. However, I am relatively new to Sencha Touch and the codebase I was given to maintain that uses it.

The answer says to put it in the initialization block of my application: as far as I can tell, that would be my app.js file that is generated by Sencha Cmd (which has a launch function). However, I'm lost after this. Would I add the first part of the above answer in the launch block? Outside of it? How would I make sure that it is automatically called on every page?

Edit: Here is my app.js file, in case it helps.

Ext.application({
    name: 'App',

    requires: [
        'Ext.MessageBox',
        'Ext.direct.*'
    ],

    models:[
        "..."
    ],

    controllers: [
        '...',
        '...',
        '...'
    ],

    icon: {
        '57': 'resources/icons/Icon.png',
        '72': 'resources/icons/Icon~ipad.png',
        '114': 'resources/icons/Icon@2x.png',
        '144': 'resources/icons/Icon~ipad@2x.png'
    },

    isIconPrecomposed: true,

    startupImage: {
        '320x460': 'resources/startup/320x460.jpg',
        '640x920': 'resources/startup/640x920.png',
        '768x1004': 'resources/startup/768x1004.png',
        '748x1024': 'resources/startup/748x1024.png',
        '1536x2008': 'resources/startup/1536x2008.png',
        '1496x2048': 'resources/startup/1496x2048.png'
    },

    profiles: ['Tablet', 'Phone'],

    launch: function() {

        ...
    }

    ....

});

Edit 2: I am using Sencha Touch 2.3.

Answer 1

The provided code in the other answer is pure Javascript and not ExtJs code, it runs in a global scope so you can add this above Ext.application (outside of ExtJs code, so make it your first bit of JS code that gets run). You could even wrap it inside an Ext.onReady call to make sure ExtJs is also fully loaded before you add it, if needed.

This should work, it might be worth looking over the Sencha forums or even on here for a more elegant and updated solution though.