Merge 626b669d89 into 1a9c325f16

umap/static/umap/js/modules/managers.js

@@ -0,0 +1,46 @@
+export class DataLayerManager extends Object {
+  add(datalayer) {
+    this[datalayer.id] = datalayer
+  }
+  active() {
+    return Object.values(this)
+      .filter((datalayer) => !datalayer.isDeleted)
+      .sort((a, b) => a.options.rank > b.options.rank)
+  }
+  reverse() {
+    return this.active().reverse()
+  }
+  count() {
+    return this.active().length
+  }
+  find(func) {
+    for (const datalayer of this.reverse()) {
+      if (func.call(datalayer, datalayer)) {
+        return datalayer
+      }
+    }
+  }
+  filter(func) {
+    return this.active().filter(func)
+  }
+  visible() {
+    return this.filter((datalayer) => datalayer.isVisible())
+  }
+  browsable() {
+    return this.reverse().filter((datalayer) => datalayer.allowBrowse())
+  }
+  prev(datalayer) {
+    const browsable = this.browsable()
+    const current = browsable.indexOf(datalayer)
+    const prev = browsable[current - 1] || browsable[browsable.length - 1]
+    if (!prev.canBrowse()) return this.prev(prev)
+    return prev
+  }
+  next(datalayer) {
+    const browsable = this.browsable()
+    const current = browsable.indexOf(datalayer)
+    const next = browsable[current + 1] || browsable[0]
+    if (!next.canBrowse()) return this.next(next)
+    return next
+  }
+}