GeoExt v4.0.0

This release updates the OpenLayers version to 6.5.0 and is the first version to use semantic versioning in GeoExt.

A step-by-step guide to update an application that uses geoext can be found here: https://github.com/terrestris/BasiGX/wiki/Update-application-to-ol-6.5.0,-geoext-4.0.0,-BasiGX-3.0.0

BREAKING CHANGES

• If a features store is configured with a layer this layer needs to be an ol.layer.Vector with an ol.source.Vector
  with a ol.Collection. That means, if you used it like this before, it will now throw an Error:

Ext.create('GeoExt.data.store.Features', {
  layer: new ol.layer.Vector({
    source: new ol.source.Vector()
  })
});

If you change it to the following code it will work and keep the elements of the store, and the layer in sync.

Ext.create('GeoExt.data.store.Features', {
  layer: new ol.layer.Vector({
    source: new ol.source.Vector({
      features: new ol.Collection()
    })
  })
});

• The OpenLayers version was updated to v6.5.0. To use this version run npm i @geoext/openlayers-legacy and include the
  ol.js and ol.css files from there.
• Due to the OpenLayers update the OverviewMap no longer can use the same layers as the main map and always has to be
  provided own layers.
• One of the bigger changes in OpenLayers is the removal of opt_this arguments. This not only true for .on and .un but also for forEachFeatureAtPixel and similar methods. If you do not call un on the method
  you can simply use .bind on the call. It you want to unbind the listener, either store a bound version of the listener
  or store the listenerKey returned by on and usw ol.Observable.unByKey.

Example 1 (un is not used):

map.on('moveend', this.doSomething, this);

becomes:

map.on('moveend', this.doSomething.bind(this));

Example 2 (un is used):

Ext.define('SomeClass', {
  method1: function () {
    map.on('moveend', this.doSomething, this);
  },
  method2: function () {
    map.un('moveend', this.doSomething, this);
  }
});

becomes:

Ext.define('SomeClass', {
  constructor: function () {
    this.doSomething = this.doSomething.bind(this); // store a bound version of the method
    this.callParent(arguments); // call parent afterwards in case the parent constructor calls method1 or method2
  },
  method1: function () {
    map.on('moveend', this.doSomething);
  },
  method2: function () {
    map.un('moveend', this.doSomething);
  }
});

• Note that the ol.Attribution class has been removed and can be replaced by simple html text

new ol.source.Vector({
  attributions: [new ol.Attribution({
    html: '© notice'
  }]
});

becomes:

new ol.source.Vector({
  attributions: '© notice' // array is optional
});

• The above are only some of the major changes. It is important to also check the OpenLayers update notes on v5.0.0 and v6.0.0:
  • https://github.com/openlayers/openlayers/releases/tag/v5.0.0
  • https://github.com/openlayers/openlayers/releases/tag/v6.0.0

CHANGES

• Enforce collections for feature store. (#686)
• Update openlayers to v6.5.0 (#651)

v3.4.0...v4.0.0