kivy: cache gui list items

gui/kivy/uix/screens.py

@@ -106,6 +106,7 @@ class HistoryScreen(CScreen):
 
     tab = ObjectProperty(None)
     kvname = 'history'
+    cards = {}
 
     def __init__(self, **kwargs):
         self.ra_dialog = None
@@ -129,48 +130,41 @@ class HistoryScreen(CScreen):
         d = LabelDialog(_('Enter Transaction Label'), text, callback)
         d.open()
 
-
-    def parse_history(self, items):
-        for item in items:
-            tx_hash, height, conf, timestamp, value, balance = item
-            status, status_str = self.app.wallet.get_tx_status(tx_hash, height, conf, timestamp)
-            icon = "atlas://gui/kivy/theming/light/" + TX_ICONS[status]
-            label = self.app.wallet.get_label(tx_hash) if tx_hash else _('Pruned transaction outputs')
-            date = timestamp_to_datetime(timestamp)
-            quote_text = ''
-            if self.app.fiat_unit and date:
-                rate = run_hook('history_rate', date)
-                if rate:
-                    s = run_hook('value_str', value, rate)
-                    quote_text = '' if s is None else s + ' ' + self.app.fiat_unit
-            yield (conf, icon, status_str, label, value, tx_hash, quote_text)
+    def get_card(self, tx_hash, height, conf, timestamp, value, balance):
+        status, status_str = self.app.wallet.get_tx_status(tx_hash, height, conf, timestamp)
+        icon = "atlas://gui/kivy/theming/light/" + TX_ICONS[status]
+        label = self.app.wallet.get_label(tx_hash) if tx_hash else _('Pruned transaction outputs')
+        date = timestamp_to_datetime(timestamp)
+        ri = self.cards.get(tx_hash)
+        if ri is None:
+            ri = Factory.HistoryItem()
+            ri.screen = self
+            ri.tx_hash = tx_hash
+            self.cards[tx_hash] = ri
+        ri.icon = icon
+        ri.date = status_str
+        ri.message = label
+        ri.value = value or 0
+        ri.value_known = value is not None
+        ri.confirmations = conf
+        if self.app.fiat_unit and date:
+            rate = run_hook('history_rate', date)
+            if rate:
+                s = run_hook('value_str', value, rate)
+                ri.quote_text = '' if s is None else s + ' ' + self.app.fiat_unit
+        return ri
 
     def update(self, see_all=False):
         if self.app.wallet is None:
             return
-
-        history = self.parse_history(reversed(
-            self.app.wallet.get_history(self.app.current_account)))
-        # repopulate History Card
+        history = reversed(self.app.wallet.get_history(self.app.current_account))
         history_card = self.screen.ids.history_container
         history_card.clear_widgets()
         count = 0
         for item in history:
+            ri = self.get_card(*item)
             count += 1
-            conf, icon, date_time, message, value, tx, quote_text = item
-            ri = Factory.HistoryItem()
-            ri.icon = icon
-            ri.date = date_time
-            ri.message = message
-            ri.value = value or 0
-            ri.value_known = value is not None
-            ri.quote_text = quote_text
-            ri.confirmations = conf
-            ri.tx_hash = tx
-            ri.screen = self
             history_card.add_widget(ri)
-            if count == 8 and not see_all:
-                break
 
         if count == 0:
             msg = _('This screen shows your list of transactions. It is currently empty.')
@@ -425,32 +419,40 @@ pr_icon = {
 
 class InvoicesScreen(CScreen):
     kvname = 'invoices'
+    cards = {}
+
+    def get_card(self, pr):
+        key = pr.get_id()
+        ci = self.cards.get(key)
+        if ci is None:
+            ci = Factory.InvoiceItem()
+            ci.key = key
+            ci.screen = self
+            self.cards[key] = ci
+
+        ci.requestor = pr.get_requestor()
+        ci.memo = pr.get_memo()
+        amount = pr.get_amount()
+        if amount:
+            ci.amount = self.app.format_amount_and_units(amount)
+            status = self.app.invoices.get_status(ci.key)
+            ci.status = invoice_text[status]
+            ci.icon = pr_icon[status]
+        else:
+            ci.amount = _('No Amount')
+            ci.status = ''
+        exp = pr.get_expiration_date()
+        ci.date = format_time(exp) if exp else _('Never')
+        return ci
 
     def update(self):
         self.menu_actions = [('Pay', self.do_pay), ('Details', self.do_view), ('Delete', self.do_delete)]
         invoices_list = self.screen.ids.invoices_container
         invoices_list.clear_widgets()
-
         _list = self.app.invoices.sorted_list()
         for pr in _list:
-            ci = Factory.InvoiceItem()
-            ci.key = pr.get_id()
-            ci.requestor = pr.get_requestor()
-            ci.memo = pr.get_memo()
-            amount = pr.get_amount()
-            if amount:
-                ci.amount = self.app.format_amount_and_units(amount)
-                status = self.app.invoices.get_status(ci.key)
-                ci.status = invoice_text[status]
-                ci.icon = pr_icon[status]
-            else:
-                ci.amount = _('No Amount')
-                ci.status = ''
-            exp = pr.get_expiration_date()
-            ci.date = format_time(exp) if exp else _('Never')
-            ci.screen = self
+            ci = self.get_card(pr)
             invoices_list.add_widget(ci)
-
         if not _list:
             msg = _('This screen shows the list of payment requests that have been sent to you. You may also use it to store contact addresses.')
             invoices_list.add_widget(EmptyLabel(text=msg))
@@ -475,6 +477,34 @@ class InvoicesScreen(CScreen):
 
 class RequestsScreen(CScreen):
     kvname = 'requests'
+    cards = {}
+
+    def get_card(self, req):
+        address = req['address']
+        timestamp = req.get('time', 0)
+        amount = req.get('amount')
+        expiration = req.get('exp', None)
+        status = req.get('status')
+        signature = req.get('sig')
+
+        ci = self.cards.get(address)
+        if ci is None:
+            ci = Factory.RequestItem()
+            ci.screen = self
+            ci.address = address
+            self.cards[address] = ci
+
+        ci.memo = self.app.wallet.get_label(address)
+        if amount:
+            status = req.get('status')
+            ci.status = request_text[status]
+        else:
+            received = self.app.wallet.get_addr_received(address)
+            ci.status = self.app.format_amount_and_units(amount)
+        ci.icon = pr_icon[status]
+        ci.amount = self.app.format_amount_and_units(amount) if amount else _('No Amount')
+        ci.date = format_time(timestamp)
+        return ci
 
     def update(self):
         self.menu_actions = [('Show', self.do_show), ('Details', self.do_view), ('Delete', self.do_delete)]
@@ -482,29 +512,8 @@ class RequestsScreen(CScreen):
         requests_list.clear_widgets()
         _list = self.app.wallet.get_sorted_requests(self.app.electrum_config) if self.app.wallet else []
         for req in _list:
-            address = req['address']
-            timestamp = req.get('time', 0)
-            amount = req.get('amount')
-            expiration = req.get('exp', None)
-            status = req.get('status')
-            signature = req.get('sig')
-
-            ci = Factory.RequestItem()
-            ci.address = address
-            ci.memo = self.app.wallet.get_label(address)
-            if amount:
-                status = req.get('status')
-                ci.status = request_text[status]
-            else:
-                received = self.app.wallet.get_addr_received(address)
-                ci.status = self.app.format_amount_and_units(amount)
-
-            ci.icon = pr_icon[status]
-            ci.amount = self.app.format_amount_and_units(amount) if amount else _('No Amount')
-            ci.date = format_time(timestamp)
-            ci.screen = self
+            ci = self.get_card(req)
             requests_list.add_widget(ci)
-
         if not _list:
             msg = _('This screen shows the list of payment requests you made.')
             requests_list.add_widget(EmptyLabel(text=msg))