From 322c9fe0426426d37652f192aa8e38f169799b11 Mon Sep 17 00:00:00 2001
From: Yohan Boniface <yohanboniface@free.fr>
Date: Thu, 10 Aug 2023 09:46:17 +0200
Subject: [PATCH] Make fromZoom and toZoom options available for all layers

fix #473
---
 umap/static/umap/js/umap.forms.js  |  6 ++++
 umap/static/umap/js/umap.layer.js  | 56 ++++++++++++++++++++----------
 umap/static/umap/test/DataLayer.js | 22 ++++++++++++
 3 files changed, 66 insertions(+), 18 deletions(-)

diff --git a/umap/static/umap/js/umap.forms.js b/umap/static/umap/js/umap.forms.js
index 19f6ad90..d6fdf2c7 100644
--- a/umap/static/umap/js/umap.forms.js
+++ b/umap/static/umap/js/umap.forms.js
@@ -1096,6 +1096,12 @@ L.U.FormBuilder = L.FormBuilder.extend({
       handler: 'ControlChoice',
       label: L._('Display the star map button'),
     },
+    fromZoom: {
+      handler: 'IntInput',
+      label: L._('From zoom'),
+      helpText: L._('Optional.'),
+    },
+    toZoom: { handler: 'IntInput', label: L._('To zoom'), helpText: L._('Optional.') },
   },
 
   initialize: function (obj, fields, options) {
diff --git a/umap/static/umap/js/umap.layer.js b/umap/static/umap/js/umap.layer.js
index 27129f4a..c9a352fc 100644
--- a/umap/static/umap/js/umap.layer.js
+++ b/umap/static/umap/js/umap.layer.js
@@ -237,11 +237,31 @@ L.U.DataLayer = L.Evented.extend({
     this.connectToMap()
     if (this.displayedOnLoad()) this.show()
     if (!this.umap_id) this.isDirty = true
+
+    // Retrocompat
+    if (this.options.remoteData && this.options.remoteData.from) {
+      this.options.fromZoom = this.options.remoteData.from
+    }
+    if (this.options.remoteData && this.options.remoteData.to) {
+      this.options.toZoom = this.options.remoteData.to
+    }
+
     this.onceLoaded(function () {
-      this.map.on('moveend', this.fetchRemoteData, this)
+      this.map.on('moveend', this.onMoveEnd, this)
+      this.map.on('zoomend', this.onZoomEnd, this)
     })
   },
 
+  onMoveEnd: function (e) {
+    if (this.isRemoteLayer()) this.fetchRemoteData()
+  },
+
+  onZoomEnd: function (e) {
+    if (this._forcedVisibility) return
+    if (!this.showAtZoom() && this.isVisible()) this.hide()
+    if (this.showAtZoom() && !this.isVisible()) this.show()
+  },
+
   displayedOnLoad: function () {
     return (
       (this.map.datalayersOnLoad &&
@@ -335,6 +355,7 @@ L.U.DataLayer = L.Evented.extend({
       this.backupData()
       this._geojson = null
     }
+    this.fire('datachanged')
   },
 
   backupData: function () {
@@ -351,17 +372,16 @@ L.U.DataLayer = L.Evented.extend({
     }
   },
 
+  showAtZoom: function () {
+    const from = parseInt(this.options.fromZoom, 10),
+      to = parseInt(this.options.toZoom, 10),
+      zoom = this.map.getZoom()
+    return !((!isNaN(from) && zoom < from) || (!isNaN(to) && zoom > to))
+  },
+
   fetchRemoteData: function () {
     if (!this.isRemoteLayer()) return
-    const from = parseInt(this.options.remoteData.from, 10),
-      to = parseInt(this.options.remoteData.to, 10)
-    if (
-      (!isNaN(from) && this.map.getZoom() < from) ||
-      (!isNaN(to) && this.map.getZoom() > to)
-    ) {
-      this.clear()
-      return
-    }
+    if (!this.showAtZoom()) return
     if (!this.options.remoteData.dynamic && this.hasDataLoaded()) return
     if (!this.isVisible()) return
     let url = this.map.localizeUrl(this.options.remoteData.url)
@@ -840,6 +860,8 @@ L.U.DataLayer = L.Evented.extend({
       'options.smoothFactor',
       'options.dashArray',
       'options.zoomTo',
+      'options.fromZoom',
+      'options.toZoom',
       'options.labelKey',
     ]
 
@@ -880,11 +902,8 @@ L.U.DataLayer = L.Evented.extend({
         { handler: 'Url', label: L._('Url'), helpEntries: 'formatURL' },
       ],
       ['options.remoteData.format', { handler: 'DataFormat', label: L._('Format') }],
-      [
-        'options.remoteData.from',
-        { label: L._('From zoom'), helpText: L._('Optional.') },
-      ],
-      ['options.remoteData.to', { label: L._('To zoom'), helpText: L._('Optional.') }],
+      'options.fromZoom',
+      'options.toZoom',
       [
         'options.remoteData.dynamic',
         { handler: 'Switch', label: L._('Dynamic'), helpEntries: 'dynamicRemoteData' },
@@ -976,9 +995,7 @@ L.U.DataLayer = L.Evented.extend({
   buildVersionsFieldset: function (container) {
     const appendVersion = function (data) {
       const date = new Date(parseInt(data.at, 10))
-      const content = `${date.toLocaleString(L.lang)} (${
-        parseInt(data.size) / 1000
-      }Kb)`
+      const content = `${date.toLocaleString(L.lang)} (${parseInt(data.size) / 1000}Kb)`
       const el = L.DomUtil.create('div', 'umap-datalayer-version', versionsContainer)
       const a = L.DomUtil.create('a', '', el)
       L.DomUtil.add('span', '', el, content)
@@ -1041,6 +1058,9 @@ L.U.DataLayer = L.Evented.extend({
   },
 
   toggle: function () {
+    // From now on, do not try to how/hide
+    // automatically this layer.
+    this._forcedVisibility = true
     if (!this.isVisible()) this.show()
     else this.hide()
   },
diff --git a/umap/static/umap/test/DataLayer.js b/umap/static/umap/test/DataLayer.js
index 75d32b16..59d9b1ad 100644
--- a/umap/static/umap/test/DataLayer.js
+++ b/umap/static/umap/test/DataLayer.js
@@ -432,4 +432,26 @@ describe('L.U.DataLayer', function () {
     })
   })
 
+  describe('#zoomEnd', function () {
+    it('should honour the fromZoom option', function () {
+      this.map.setZoom(6, {animate: false})
+      assert.ok(qs('path[fill="none"]'))
+      this.datalayer.options.fromZoom = 6
+      this.map.setZoom(5, {animate: false})
+      assert.notOk(qs('path[fill="none"]'))
+      this.map.setZoom(6, {animate: false})
+      assert.ok(qs('path[fill="none"]'))
+    })
+
+    it('should honour the toZoom option', function () {
+      this.map.setZoom(6, {animate: false})
+      assert.ok(qs('path[fill="none"]'))
+      this.datalayer.options.toZoom = 6
+      this.map.setZoom(7, {animate: false})
+      assert.notOk(qs('path[fill="none"]'))
+      this.map.setZoom(6, {animate: false})
+      assert.ok(qs('path[fill="none"]'))
+    })
+  })
+
 })