Ext JS 6

• Download and Install Sencha Cmd 6
• Download and unzip the Ext JS 6 SDK (remember the path)

Open your terminal or console window and issue these commands

sencha -sdk /path/to/ext6 generate app <APPNAME> <APPNAME>
cd <APPNAME>
sencha app watch

This will generate a skeleton app, sencha app watch will check for any changes made to css or js.

Open your terminal or console window and issue these commands *inside* the app folder :

sencha app install --frameworks ~/Downloads/ExtJS/
sencha app watch

This will allow you to work with the ext project, sencha app watch will check for any changes made to css or js.

Open your terminal or console window and issue these commands *inside* the app folder :

sencha app upgrade ~/Downloads/ExtJS/ext-6.6.0/
sencha app watch

Desktop code usually goes into <APPNAME>/classic/src, stylechanges in <APPNAME>/classic/sass
Mobile/Tablet code usually goes into <APPNAME>/modern/src, stylechanges in <APPNAME>/modern/sass
Code which is universal (like models & stores) can be defined in <APPNAME>/app

You can only use “classic” extjs classes in the classic folder, & “modern” (touch) classes in the modern folder.

in app.json there's a default config for builds :

"builds": {
        "classic": {
            "toolkit": "classic",
            "theme": "theme-triton",
            "sass": {
                "generated": {
                    "var": "classic/sass/save.scss",
                    "src": "classic/sass/save"
                }
            }
        },

        "modern": {
            "toolkit": "modern",
            "theme": "theme-material",
            "sass": {
                "generated": {
                    "var": "modern/sass/save.scss",
                    "src": "modern/sass/save"
                }
            }
        }
    },

It's possible to add customer specific builds, just copy modern or classic + add your extra config (pwa overrides for example).
making a build with the newly defined build is then

sencha app build <customer>

Modern global CSS variables : https://docs.sencha.com/extjs/6.6.0/modern/Global_CSS.html
Classic global CSS variables : https://docs.sencha.com/extjs/6.6.0/classic/Global_CSS.html

The simplest styling using variables & mixins. Add a “var” folder under “sass”, make a file called Application.scss.
Overriding $base-color goes a long way .

To change a button's color it's recommended to make use of the mixins
(example of classic mixins, note usage of different button uis depending on position which is a classic thing) :

@include extjs-button-small-ui(
$ui: 'action',
$glyph-color: #000,
$color: #000,
$inner-border-width: 0,
$border-color: #F7C000,
$background-color: #F7C000
);

@include extjs-button-toolbar-small-ui(
$ui: 'mandantselect',
$glyph-color: #000,
$color: #000,
$inner-border-width: 0,
$border-color: #eeeeee,
$background-color: #eeeeee
);