HLoader as room delegates test

TODO.md

@@ -148,6 +148,7 @@
 ## Backend
 
 - Saving the room settings
+- Optimize Model item replacement
 - Refetch profile after manual profile change, don't wait for a room event
 
 - Better config file format

src/gui/MainPane/AccountRoomsDelegate.qml

@@ -10,7 +10,8 @@ Column {
     // visible: account.opacity > 0
 
 
-    property string userId: model.id
+    readonly property string userId: model.id
+    readonly property bool firstSyncDone: model.first_sync_done
     readonly property HListView view: ListView.view
     readonly property int listIndex: index
     readonly property bool noFilterResults:
@@ -53,14 +54,40 @@ Column {
             ]
         }
 
-        delegate: Room {
+        delegate: HLoader {
+            active: firstSyncDone && (inView || model.index === 0)
+            width: roomList.width
+            height: roomList.firstDelegateHeight
+
+            // XXX: these assume the view has no spacing/margins/header/footer
+            readonly property int yTop:
+                accountRooms.y + account.height + accountRooms.spacing +
+                model.index * height
+            readonly property int yBottom: yTop + height
+            readonly property bool inView:
+                yBottom >= mainPaneList.contentY &&
+                yTop <= mainPaneList.contentY + mainPaneList.height
+
+            readonly property var sourceModel: model
+
+            sourceComponent: Room {
                 width: roomList.width
                 userId: accountRooms.userId
+                view: roomList
+                model: sourceModel
+            }
         }
 
         highlight: null  // managed by the AccountRoomsList
 
 
+        // Delete 0 must *always* be loaded, and all delegates must have the
+        // same height
+        readonly property int firstDelegateHeight:
+            contentItem.visibleChildren[0] ?
+            contentItem.visibleChildren[0].implicitHeight :
+            0
+
         readonly property bool hasActiveRoom:
             window.uiState.page === "Pages/Chat/Chat.qml" &&
             window.uiState.pageProperties.userId === userId

src/gui/MainPane/AccountRoomsList.qml

@@ -71,7 +71,7 @@ HListView {
     property bool detachedCurrentIndex: false
     property bool centerToHighlight: true
 
-    readonly property Room selectedRoom:
+    readonly property HLoader selectedRoom:
         currentItem ? currentItem.roomList.currentItem : null
 
     readonly property bool hasActiveAccount:
@@ -187,7 +187,8 @@ HListView {
         if (! currentItem) return
 
         const room = currentItem.roomList.contentItem.children[index]
-        if (room && room.activated) room.activated()
+        print(index, room, room.item)
+        if (room && room.item && room.item.activated) room.item.activated()
     }
 
     function requestActivate() {
@@ -199,7 +200,7 @@ HListView {
         if (! currentItem) return
 
         selectedRoom ?
-        currentItem.roomList.currentItem.activated() :
+        currentItem.roomList.currentItem.item.activated() :
         currentItem.account.activated()
 
         detachedCurrentIndex = false

src/gui/MainPane/Room.qml

@@ -10,10 +10,12 @@ import "../Base/HTile"
 HTileDelegate {
     id: room
     backgroundColor: theme.mainPane.listView.room.background
-    opacity: model.left ? theme.mainPane.listView.room.leftRoomOpacity : 1
+    opacity:
+        model.left ? theme.mainPane.listView.room.leftRoomOpacity : 1
 
     topPadding: theme.spacing / (model.index === 0 ? 1 : 1.5)
-    bottomPadding: theme.spacing / (model.index === view.count - 1 ? 1 : 1.5)
+    bottomPadding:
+        theme.spacing / (model.index === view.count - 1 ? 1 : 1.5)
     leftPadding: theme.spacing * 2
     rightPadding: theme.spacing
 
@@ -213,6 +215,8 @@ HTileDelegate {
 
 
     property string userId
+    property QtObject model
+
     readonly property bool joined: ! invited && ! parted
     readonly property bool invited: model.inviter_id && ! parted
     readonly property bool parted: model.left

src/gui/PythonBridge/Privates/EventHandlers.qml

@@ -50,13 +50,13 @@ QtObject {
 
 
     function onModelItemInserted(syncId, index, item) {
-        print("insert", syncId, index, item)
+        // print("insert", syncId, index, item)
         ModelStore.get(syncId).insert(index, item)
     }
 
 
     function onModelItemFieldChanged(syncId, oldIndex, newIndex, field, value){
-        print("change", syncId, oldIndex, newIndex, field, value)
+        // print("change", syncId, oldIndex, newIndex, field, value)
         const model = ModelStore.get(syncId)
         model.setProperty(oldIndex, field, value)
 
@@ -65,7 +65,7 @@ QtObject {
 
 
     function onModelItemDeleted(syncId, index) {
-        print("del", syncId, index)
+        // print("del", syncId, index)
         ModelStore.get(syncId).remove(index)
     }