small chat perf impr

Signed-off-by: andrey <motor4ik@gmail.com>

src/status_im/chat/models.cljs

@@ -274,7 +274,8 @@
   [{db :db :as cofx} chat-id]
   (fx/merge cofx
             (close-chat)
-            #(assoc-in % [:db :current-chat-id] chat-id)
+            (fn [{:keys [db]}]
+              {:db (assoc db :current-chat-id chat-id)})
             (preload-chat-data chat-id)
             (navigation/navigate-to-cofx :chat-stack {:screen :chat})))
 

src/status_im/subs.cljs

@@ -966,13 +966,12 @@
  :chats/chat-messages-stream
  (fn [[_ chat-id] _]
    [(re-frame/subscribe [:chats/raw-chat-messages-stream chat-id])
+    (re-frame/subscribe [:chats/chat-no-messages? chat-id])
     (re-frame/subscribe [:view-id])])
- (fn [[messages view-id]]
-   (if (or (= view-id :chat) (empty? messages))
-     (do
-       (reset! memo-chat-messages-stream messages)
-       messages)
-     @memo-chat-messages-stream)))
+ (fn [[messages empty view-id]]
+   (when (or (= view-id :chat) empty)
+     (reset! memo-chat-messages-stream messages))
+   @memo-chat-messages-stream))
 
 (def memo-profile-messages-stream (atom nil))
 
@@ -980,13 +979,12 @@
  :chats/profile-messages-stream
  (fn [[_ chat-id] _]
    [(re-frame/subscribe [:chats/raw-chat-messages-stream chat-id])
+    (re-frame/subscribe [:chats/chat-no-messages? chat-id])
     (re-frame/subscribe [:view-id])])
- (fn [[messages view-id]]
-   (if (or (= view-id :profile) (empty? messages))
-     (do
-       (reset! memo-profile-messages-stream messages)
-       messages)
-     @memo-profile-messages-stream)))
+ (fn [[messages empty view-id]]
+   (when (or (= view-id :profile) empty)
+     (reset! memo-profile-messages-stream messages))
+   @memo-profile-messages-stream))
 
 (def memo-timeline-messages-stream (atom nil))
 

src/status_im/ui/screens/home/views.cljs

@@ -164,6 +164,9 @@
 (defn chat-list-key-fn [item]
   (or (:chat-id item) (:id item)))
 
+(defn get-item-layout [_ index]
+  #js {:length 64 :offset (* 64 index) :index index})
+
 (views/defview communities-and-chats []
   (views/letsubs [{:keys [items search-filter]} [:home-items]
                   hide-home-tooltip? [:hide-home-tooltip?]]
@@ -174,6 +177,7 @@
       [welcome-blank-page]
       [list/flat-list
        {:key-fn                       chat-list-key-fn
+        :getItemLayout                get-item-layout
         :initialNumToRender           5
         :keyboard-should-persist-taps :always
         :data                         items

src/status_im/ui/screens/home/views/inner_item.cljs

@@ -13,8 +13,7 @@
             [status-im.utils.contenthash :as contenthash]
             [status-im.utils.core :as utils]
             [status-im.utils.datetime :as time]
-            [status-im.ui.components.chat-icon.styles :as chat-icon.styles]
-            [status-im.ui.screens.chat.sheets :as sheets]))
+            [status-im.ui.components.chat-icon.styles :as chat-icon.styles]))
 
 (defn mention-element [from]
   @(re-frame/subscribe [:contacts/contact-name-by-identity from]))
@@ -124,21 +123,6 @@
                     :accessibility-label :unviewed-messages-public}]
        [badge/message-counter unviewed-messages-count])]))
 
-(def memo-on-long-press
-  (memoize
-   (fn [chat-id]
-     (fn []
-       (re-frame/dispatch [:bottom-sheet/show-sheet
-                           {:content (fn [] [sheets/chat-actions chat-id])}])))))
-
-(def memo-on-press
-  (memoize
-   (fn [chat-id]
-     (fn []
-       (re-frame/dispatch [:dismiss-keyboard])
-       (re-frame/dispatch [:chat.ui/navigate-to-chat chat-id])
-       (re-frame/dispatch [:search/home-filter-changed nil])))))
-
 (defn icon-style []
   {:color           colors/black
    :width           15