From b5bf1396f3f79f5dd22a0db7213533037f360687 Mon Sep 17 00:00:00 2001
From: Yohan Boniface <yohanboniface@free.fr>
Date: Fri, 13 Oct 2023 11:53:04 +0200
Subject: [PATCH] Experimental drag and drop of file on the map container

---
 umap/static/umap/js/umap.controls.js | 45 ++++++++++++++++++++++++++++
 umap/static/umap/js/umap.js          | 16 ++++++----
 2 files changed, 55 insertions(+), 6 deletions(-)

diff --git a/umap/static/umap/js/umap.controls.js b/umap/static/umap/js/umap.controls.js
index 75a8371c..87dbac6c 100644
--- a/umap/static/umap/js/umap.controls.js
+++ b/umap/static/umap/js/umap.controls.js
@@ -313,6 +313,51 @@ L.U.DrawToolbar = L.Toolbar.Control.extend({
   },
 })
 
+L.U.DropControl = L.Class.extend({
+
+  initialize: function (map) {
+    this.map = map
+    this.dropbox = map._container
+  },
+
+  enable: function () {
+    L.DomEvent.on(this.dropbox, "dragenter", this.dragenter, this)
+    L.DomEvent.on(this.dropbox, "dragover", this.dragover, this)
+    L.DomEvent.on(this.dropbox, "drop", this.drop, this)
+    L.DomEvent.on(this.dropbox, "dragleave", this.dragleave, this)
+  },
+
+  disable: function () {
+    L.DomEvent.off(this.dropbox, "dragenter", this.dragenter, this)
+    L.DomEvent.off(this.dropbox, "dragover", this.dragover, this)
+    L.DomEvent.off(this.dropbox, "drop", this.drop, this)
+    L.DomEvent.off(this.dropbox, "dragleave", this.dragleave, this)
+  },
+
+  dragenter: function (e) {
+    L.DomEvent.stop(e)
+    this.map.scrollWheelZoom.disable()
+  },
+
+  dragover: function (e) {
+    L.DomEvent.stop(e)
+  },
+
+  drop: function (e) {
+    L.DomEvent.stop(e)
+    this.map.scrollWheelZoom.enable()
+    for (let i = 0, file; (file = e.dataTransfer.files[i]); i++) {
+      this.map.processFileToImport(file)
+    }
+    this.map.onceDataLoaded(this.map.fitDataBounds)
+  },
+
+  dragleave: function () {
+    this.map.scrollWheelZoom.enable()
+  }
+
+})
+
 L.U.EditControl = L.Control.extend({
   options: {
     position: 'topright',
diff --git a/umap/static/umap/js/umap.js b/umap/static/umap/js/umap.js
index e762db14..6cdabc40 100644
--- a/umap/static/umap/js/umap.js
+++ b/umap/static/umap/js/umap.js
@@ -340,6 +340,7 @@ L.U.Map.include({
     if (this.options.scrollWheelZoom) this.scrollWheelZoom.enable()
     else this.scrollWheelZoom.disable()
     this.browser = new L.U.Browser(this)
+    this.drop = new L.U.DropControl(this)
     this.renderControls()
   },
 
@@ -670,6 +671,12 @@ L.U.Map.include({
     }
   },
 
+  fitDataBounds: function () {
+    const bounds = this.getLayersBounds()
+    if (!this.hasData() || !bounds.isValid()) return false
+    this.fitBounds(bounds)
+  },
+
   initCenter: function () {
     if (this.options.hash && this._hash.parseHash(location.hash)) {
       // FIXME An invalid hash will cause the load to fail
@@ -679,12 +686,7 @@ L.U.Map.include({
       this._controls.locate.start()
     } else if (this.options.defaultView === 'data') {
       this.onceDataLoaded(() => {
-        const bounds = this.getLayersBounds()
-        if (!this.hasData() || !bounds.isValid()) {
-          this._setDefaultCenter()
-          return
-        }
-        this.fitBounds(bounds)
+        if (!this.fitDataBounds()) return this._setDefaultCenter()
       })
     } else if (this.options.defaultView === 'latest') {
       this.onceDataLoaded(() => {
@@ -1710,11 +1712,13 @@ L.U.Map.include({
   enableEdit: function () {
     L.DomUtil.addClass(document.body, 'umap-edit-enabled')
     this.editEnabled = true
+    this.drop.enable()
     this.fire('edit:enabled')
   },
 
   disableEdit: function () {
     if (this.isDirty) return
+    this.drop.disable()
     L.DomUtil.removeClass(document.body, 'umap-edit-enabled')
     this.editedFeature = null
     this.editEnabled = false