From 3a18cacf0fc761868a523dbb05e4ec30213c7942 Mon Sep 17 00:00:00 2001
From: simon <simon@journeyman.cc>
Date: Fri, 21 Jul 2017 15:51:16 +0100
Subject: [PATCH] #43 Zoom and lat/long now captured in state.

---
 .../youyesyet/canvasser_app/handlers.cljs     | 26 +++++++++++++++++++
 src/cljs/youyesyet/canvasser_app/state.cljs   |  6 ++++-
 .../canvasser_app/subscriptions.cljs          | 19 ++++++++++++++
 .../youyesyet/canvasser_app/views/map.cljs    | 13 ++++++++--
 4 files changed, 61 insertions(+), 3 deletions(-)

diff --git a/src/cljs/youyesyet/canvasser_app/handlers.cljs b/src/cljs/youyesyet/canvasser_app/handlers.cljs
index 813ec99..a916231 100644
--- a/src/cljs/youyesyet/canvasser_app/handlers.cljs
+++ b/src/cljs/youyesyet/canvasser_app/handlers.cljs
@@ -169,8 +169,34 @@
    (assoc (clear-messages db) :issue issue)))
 
 
+(reg-event-db
+ :set-latitude
+ (fn [db [_ issue]]
+   (assoc db :latitude issue)))
+
+
+(reg-event-db
+ :set-longitude
+ (fn [db [_ issue]]
+   (assoc db :longitude issue)))
+
+
 (reg-event-db
  :set-telephone
  (fn [db [_ telephone]]
    (js/console.log (str "Setting telephone to " telephone))
    (assoc (clear-messages db) :telephone telephone)))
+
+
+(reg-event-db
+  :set-view
+  (fn [db [_ view]]
+    (assoc db :view view)))
+
+
+(reg-event-db
+  :set-zoom
+  (fn [db [_ zoom]]
+    (if (integer? zoom)
+      (assoc db :zoom zoom)
+      db)))
diff --git a/src/cljs/youyesyet/canvasser_app/state.cljs b/src/cljs/youyesyet/canvasser_app/state.cljs
index c967f7c..241752e 100644
--- a/src/cljs/youyesyet/canvasser_app/state.cljs
+++ b/src/cljs/youyesyet/canvasser_app/state.cljs
@@ -82,4 +82,8 @@
     ;;; the queue of items waiting to be transmitted.
     :outqueue ()
     ;;; the currently displayed page within the app.
-    :page :home})
+    :page :home
+    :view nil
+    :latitude 55.82
+    :longitude -4.25
+    :zoom 12})
diff --git a/src/cljs/youyesyet/canvasser_app/subscriptions.cljs b/src/cljs/youyesyet/canvasser_app/subscriptions.cljs
index 3f87dee..8fd4218 100644
--- a/src/cljs/youyesyet/canvasser_app/subscriptions.cljs
+++ b/src/cljs/youyesyet/canvasser_app/subscriptions.cljs
@@ -76,6 +76,16 @@
   (fn [db _]
     (:issues db)))
 
+(reg-sub
+  :latitude
+  (fn [db _]
+    (:latitude db)))
+
+(reg-sub
+  :longitude
+  (fn [db _]
+    (:longitude db)))
+
 (reg-sub
   :page
   (fn [db _]
@@ -91,3 +101,12 @@
  (fn [db _]
    (:outqueue db)))
 
+(reg-sub
+  :view
+  (fn [db _]
+    (:view db)))
+
+(reg-sub
+  :zoom
+  (fn [db _]
+    (:zoom db)))
diff --git a/src/cljs/youyesyet/canvasser_app/views/map.cljs b/src/cljs/youyesyet/canvasser_app/views/map.cljs
index a0a7097..f60887d 100644
--- a/src/cljs/youyesyet/canvasser_app/views/map.cljs
+++ b/src/cljs/youyesyet/canvasser_app/views/map.cljs
@@ -77,6 +77,11 @@
   so back links work."
   [id]
   (js/console.log (str "Click handler for address #" id))
+  (let [view @(subscribe [:view])
+        centre (.getCenter view)]
+    (dispatch [:set-zoom (.getZoom view)])
+    (dispatch [:set-latitude (.-lat centre)])
+    (dispatch [:set-longitude (.-lng centre)]))
   (set! window.location.href (str "#building/" id)))
 ;; This way is probably more idiomatic React, but history doesn't work:
 ;; (defn map-pin-click-handler
@@ -121,7 +126,10 @@
 (defn map-did-mount-osm
   "Did-mount function loading map tile data from Open Street Map."
   []
-  (let [view (.setView (.map js/L "map" (clj->js {:zoomControl false})) #js [55.82 -4.25] 13)
+  (let [view (.setView
+               (.map js/L "map" (clj->js {:zoomControl false}))
+               #js [@(subscribe [:latitude]) @(subscribe [:longitude])]
+               @(subscribe [:zoom]))
         addresses @(subscribe [:addresses])]
     (js/console.log (str "Adding " (count addresses) " pins"))
     (doall (map #(add-map-pin % view) addresses))
@@ -129,7 +137,8 @@
                         (clj->js {:attribution osm-attrib
                                   :maxZoom 18}))
             view)
-    ))
+    (dispatch [:set-view view])
+    view))
 
 
 (defn map-did-mount