I will give you advice from ExtJS 6.6, be careful it can be updated from 6.7.
I have face the same probleme not so long ago and I found this event : https://docs.sencha.com/extjs/6.6.0/modern/Ext.viewport.Default.html#event-orientationchange
Ok it's only on viewport but i don't found any other solution.
Actually I do something like that :
At the end of my main view initialize function :
Ext.Viewport.on('orientationchange', this.getController().OnOrientationChange, this.getController());
On my main view controller :
OnOrientationChange: function(viewport, orientation) {
viewport.mask();
var actualWidth = window.innerWidth;
var actualHeight = window.innerHeight;
// Orientation check due to latence can fake orientation result
if (orientation === "landscape") {
if (actualWidth < actualHeight) {
Ext.defer(this.OnOrientationChange, 100, this, [viewport, orientation]);
return;
}
}
else if (orientation === "portrait") {
if (actualWidth > actualHeight) {
Ext.defer(this.OnOrientationChange, 100, this, [viewport, orientation]);
return;
}
}
viewport.unmask();
// Xtype liste of object would by notified
var objXtypeList = ['dataview', 'carousel', 'signingarea'];
for (var i = 0, max = objXtypeList.length; i < max; i++) {
var objXtype = objXtypeList[i];
var objList = viewport.query(objXtype);
for (var j = 0, maxJ = objList.length; j < maxJ; j++) {
var obj = objList[j];
if (Ext.isFunction(obj.OnOrientationChange)) {
Ext.defer(obj.OnOrientationChange, 50, obj, [orientation]);
}
}
}
}
Every object's controller that has to react :
OnOrientationChange: function(orientation) {
// The way the object should react
}
I don't know if that was the most correct way to to it, but it's worked for me.