Add busy indicators during loading in views

src/cutecoin/gui/busy.py

+from PyQt5.QtWidgets import QWidget
+from PyQt5.QtGui import QPalette, QPainter, QColor, QBrush, QPen
+from PyQt5.QtCore import Qt
+
+import math
+
+
+class Busy(QWidget):
+    def __init__(self, parent = None):
+        QWidget.__init__(self, parent)
+        palette = QPalette(self.palette())
+        palette.setColor(palette.Background, Qt.transparent)
+        self.setPalette(palette)
+        self.timer = None
+
+    def paintEvent(self, event):
+        painter = QPainter()
+        painter.begin(self)
+        painter.setRenderHint(QPainter.Antialiasing)
+        painter.fillRect(event.rect(), QBrush(QColor(255, 255, 255, 127)))
+        painter.setPen(QPen(Qt.NoPen))
+
+        for i in range(12):
+            if self.counter % 12 == i:
+                painter.setBrush(QBrush(QColor(165, 165, 165, (self.counter % 12)*22)))
+            else:
+                painter.setBrush(QBrush(QColor(165, 165, 165)))
+            painter.drawEllipse(
+                self.width()/2 + 50 * math.cos(2 * math.pi * i / 12.0) - 5,
+                self.height()/2 + 50 * math.sin(2 * math.pi * i / 12.0) - 5,
+                12, 12)
+
+        painter.end()
+
+    def showEvent(self, event):
+        self.timer = self.startTimer(150)
+        self.counter = 0
+        super().showEvent(event)
+
+    def hideEvent(self, event):
+        if self.timer:
+            self.killTimer(self.timer)
+            self.timer = None
+        super().hideEvent(event)
+
+    def timerEvent(self, event):
+        self.counter += 1
+        self.update()
+        super().timerEvent(event)

src/cutecoin/gui/identities_tab.py

@@ -14,6 +14,7 @@ from ..gen_resources.identities_tab_uic import Ui_IdentitiesTab
 from .contact import ConfigureContactDialog
 from .member import MemberDialog
 from .transfer import TransferMoneyDialog
+from .busy import Busy
 from .certification import CertificationDialog
 import asyncio
 from ..core.net.api import bma as qtbma
@@ -62,11 +63,15 @@ class IdentitiesTabWidget(QWidget, Ui_IdentitiesTab):
         self.button_search.addAction(direct_connections)
         self.button_search.clicked.connect(self._async_execute_search_text)
 
+        self.busy = Busy(self.table_identities)
+        self.busy.hide()
+
     def cancel_once_tasks(self):
         cancel_once_task(self, self.identity_context_menu)
         cancel_once_task(self, self._async_execute_search_text)
         cancel_once_task(self, self._async_search_members)
         cancel_once_task(self, self._async_search_direct_connections)
+        cancel_once_task(self, self.refresh_identities)
 
     def change_account(self, account, password_asker):
         self.cancel_once_tasks()
@@ -173,6 +178,7 @@ class IdentitiesTabWidget(QWidget, Ui_IdentitiesTab):
     @asyncify
     @asyncio.coroutine
     def _async_execute_search_text(self, checked):
+        self.busy.show()
         text = self.edit_textsearch.text()
         if len(text) < 2:
             return
@@ -184,6 +190,7 @@ class IdentitiesTabWidget(QWidget, Ui_IdentitiesTab):
 
         self.edit_textsearch.clear()
         self.refresh_identities(identities)
+        self.busy.hide()
 
     @once_at_a_time
     @asyncify
@@ -193,6 +200,7 @@ class IdentitiesTabWidget(QWidget, Ui_IdentitiesTab):
         Search members of community and display found members
         """
         if self.community:
+            self.busy.show()
             pubkeys = yield from self.community.members_pubkeys()
             identities = []
             for p in pubkeys:
@@ -201,6 +209,7 @@ class IdentitiesTabWidget(QWidget, Ui_IdentitiesTab):
 
             self.edit_textsearch.clear()
             self.refresh_identities(identities)
+            self.busy.hide()
 
     @once_at_a_time
     @asyncify
@@ -210,6 +219,7 @@ class IdentitiesTabWidget(QWidget, Ui_IdentitiesTab):
         Search members of community and display found members
         """
         if self.account and self.community:
+            self.busy.show()
             self_identity = yield from self.account.identity(self.community)
             account_connections = []
             certs_of = yield from self_identity.unique_valid_certifiers_of(self.app.identities_registry, self.community)
@@ -223,14 +233,24 @@ class IdentitiesTabWidget(QWidget, Ui_IdentitiesTab):
                       if p.pubkey not in [i.pubkey for i in certifiers_of]]
             identities = certifiers_of + certified_by
             self.refresh_identities(identities)
+            self.busy.hide()
 
+    @once_at_a_time
+    @asyncify
+    @asyncio.coroutine
     def refresh_identities(self, identities):
         """
         Refresh the table with specified identities.
         If no identities is passed, use the account connections.
         """
-        self.table_identities.model().sourceModel().refresh_identities(identities)
+        self.busy.show()
+        yield from self.table_identities.model().sourceModel().refresh_identities(identities)
         self.table_identities.resizeColumnsToContents()
+        self.busy.hide()
+
+    def resizeEvent(self, event):
+        self.busy.resize(event.size())
+        super().resizeEvent(event)
 
     def changeEvent(self, event):
         """

src/cutecoin/gui/wot_tab.py

@@ -17,6 +17,7 @@ from .contact import ConfigureContactDialog
 from ..gen_resources.wot_tab_uic import Ui_WotTabWidget
 from cutecoin.gui.views.wot import NODE_STATUS_HIGHLIGHTED, NODE_STATUS_SELECTED, NODE_STATUS_OUT, ARC_STATUS_STRONG, \
     ARC_STATUS_WEAK
+from .busy import Busy
 
 
 class WotTabWidget(QWidget, Ui_WotTabWidget):
@@ -40,6 +41,9 @@ class WotTabWidget(QWidget, Ui_WotTabWidget):
         # the edited text is not added in the item list
         self.comboBoxSearch.setInsertPolicy(QComboBox.NoInsert)
 
+        self.busy = Busy(self.graphicsView)
+        self.busy.hide()
+
         # add scene events
         self.graphicsView.scene().node_clicked.connect(self.handle_node_click)
         self.graphicsView.scene().node_signed.connect(self.sign_node)
@@ -177,6 +181,7 @@ class WotTabWidget(QWidget, Ui_WotTabWidget):
         :param cutecoin.core.registry.Identity identity: Graph node identity
         """
         logging.debug("Draw graph - " + identity.uid)
+        self.busy.show()
 
         if self.community:
             identity_account = yield from self.account.identity(self.community)
@@ -217,6 +222,7 @@ class WotTabWidget(QWidget, Ui_WotTabWidget):
                 path = yield from graph.get_shortest_path_between_members(identity, identity_account)
                 if path:
                     self.graphicsView.scene().update_path(path)
+        self.busy.hide()
 
     @once_at_a_time
     @asyncify
@@ -322,6 +328,10 @@ class WotTabWidget(QWidget, Ui_WotTabWidget):
         if result == QDialog.Accepted:
             self.window().refresh_contacts()
 
+    def resizeEvent(self, event):
+        self.busy.resize(event.size())
+        super().resizeEvent(event)
+
     def changeEvent(self, event):
         """
         Intercepte LanguageChange event to translate UI

src/cutecoin/models/identities.py

@@ -40,6 +40,7 @@ class IdentitiesFilterProxyModel(QSortFilterProxyModel):
 
     def data(self, index, role):
         source_index = self.mapToSource(index)
+        if source_index.isValid():
             source_data = self.sourceModel().data(source_index, role)
             expiration_col = self.sourceModel().columns_ids.index('expiration')
             expiration_index = self.sourceModel().index(source_index.row(), expiration_col)
@@ -95,7 +96,6 @@ class IdentitiesTableModel(QAbstractTableModel):
         self._sig_validity = 0
 
     def change_community(self, community):
-        cancel_once_task(self, self.refresh_identities)
         self.community = community
 
     def sig_validity(self):
@@ -119,8 +119,6 @@ class IdentitiesTableModel(QAbstractTableModel):
 
         return (identity.uid, identity.pubkey, join_date, expiration_date)
 
-    @once_at_a_time
-    @asyncify
     @asyncio.coroutine
     def refresh_identities(self, identities):
         """
@@ -153,7 +151,8 @@ class IdentitiesTableModel(QAbstractTableModel):
         if role == Qt.DisplayRole:
             row = index.row()
             col = index.column()
-            return self.identities_data[row][col]
+            identity_data = self.identities_data[row]
+            return identity_data[col]
 
     def identity_index(self, pubkey):
         try: