Show last room message as roomDelegate subtitle

harmonyqml/backend/base.py

@@ -20,7 +20,7 @@ class User(NamedTuple):
 class Room(NamedTuple):
     room_id:                    str
     display_name:               str
-    subtitle:                   str           = ""
+    description:                str           = ""
     unread_messages:            int           = 0
     presence:                   Presence      = Presence.none
     activity:                   Activity      = Activity.none

harmonyqml/backend/list_model.py

@@ -4,19 +4,28 @@ from typing import Any, Dict, List, Mapping, Optional, Sequence, Tuple, Union
 
 from namedlist import namedlist
 from PyQt5.QtCore import (
-    QAbstractListModel, QModelIndex, Qt, pyqtProperty, pyqtSlot
+    QAbstractListModel, QModelIndex, Qt, pyqtProperty, pyqtSlot, pyqtSignal
 )
 
 NewValue = Union[Mapping[str, Any], Sequence]
 
 
 class _QtListModel(QAbstractListModel):
+    updated = pyqtSignal()
+
     def __init__(self) -> None:
         super().__init__()
         self._ref_namedlist          = None
         self._roles: Tuple[str, ...] = ()
         self._list:  list            = []
 
+        self._update_counter: int = 0
+
+        for sig in (self.dataChanged, self.layoutChanged, self.modelReset,
+                    self.rowsInserted, self.rowsMoved, self.rowsRemoved):
+            sig.connect(self.updated.emit)
+
+
     def roleNames(self) -> Dict[int, bytes]:
         return {Qt.UserRole + i: bytes(f, "utf-8")
                 for i, f in enumerate(self._roles, 1)}
@@ -61,7 +70,7 @@ class _QtListModel(QAbstractListModel):
 
 
     @pyqtSlot(int, result="QVariantMap")
-    def get(self, index: int) -> Dict[str, Any]:
+    def get(self, index: int) -> Optional[Dict[str, Any]]:
         return self._list[index]._asdict()
 
 
@@ -73,7 +82,7 @@ class _QtListModel(QAbstractListModel):
         self.endInsertRows()
 
 
-    @pyqtProperty(int)
+    @pyqtProperty(int, constant=True)
     def count(self) -> int:
         return self.rowCount()
 
@@ -142,6 +151,13 @@ class _QtListModel(QAbstractListModel):
         self.endRemoveRows()
 
 
+    @pyqtProperty(int, notify=updated)
+    def reloadThis(self) -> int:
+        # http://www.mardy.it/blog/2016/11/qml-trick-force-re-evaluation-of.html
+        self._update_counter += 1
+        return self._update_counter
+
+
 class ListModel(MutableSequence):
     def __init__(self, initial_data: Optional[List[NewValue]] = None) -> None:
         super().__init__()

harmonyqml/components/chat/RoomHeader.qml

@@ -32,8 +32,8 @@ Rectangle {
         }
 
         Base.HLabel {
-            id: "roomSubtitle"
-            text: chatPage.room.subtitle
+            id: "roomDescription"
+            text: chatPage.room.description
             font.pixelSize: smallSize
             elide: Text.ElideRight
             maximumLineCount: 1

harmonyqml/components/side_pane/AccountDelegate.qml

@@ -75,12 +75,13 @@ ColumnLayout {
             0
         Layout.maximumHeight: Layout.minimumHeight
 
-        Layout.minimumWidth: parent.width - Layout.leftMargin * 2
+        Layout.minimumWidth:
+            parent.width - Layout.leftMargin - Layout.rightMargin
         Layout.maximumWidth: Layout.minimumWidth
 
         Layout.margins: accountList.spacing
         Layout.leftMargin:
             sidePane.width < 36 + Layout.margins ? 0 : Layout.margins
-        Layout.rightMargin: Layout.leftMargin
+        Layout.rightMargin: 0
     }
 }

harmonyqml/components/side_pane/RoomDelegate.qml

@@ -37,9 +37,25 @@ MouseArea {
                 rightPadding: leftPadding
             }
             Base.HLabel {
+                function get_text() {
+                    var msgs = Backend.messagesModel[room_id]
+                    if (msgs.count < 1) { return "" }
+
+                    var msg = msgs.get(-1)
+                    var color_ = (msg.sender_id === roomList.user.user_id ?
+                                  "darkblue" : "purple")
+
+                    return "<font color=\"" + color_ + "\">" +
+                           Backend.getUser(msg.sender_id).display_name +
+                           ":</font> " +
+                           msg.content
+                }
+
                 id: subtitleLabel
                 visible: text !== ""
-                text: subtitle
+                text: Backend.messagesModel[room_id].reloadThis, get_text()
+                textFormat: Text.StyledText
+
                 font.pixelSize: smallSize
                 elide: Text.ElideRight
                 maximumLineCount: 1