SPDX-FileCopyrightText: 2025 Tobias Fella <tobias.fella@kde.org>
SPDX-License-Identifier: BSD-2-Clause
From ca72345b8ee550be2172d8ac5e5dc9e4c2b508c9 Mon Sep 17 00:00:00 2001
From: Tobias Fella <tobias.fella@kde.org>
Date: Sun, 17 Aug 2025 20:00:08 +0200
Subject: [PATCH] Revert "Use new Kirigami builtin column resize handle"

This reverts commit de97275a387abcbca6fcb185bcbd1b69c30f5c66.
---
 src/app/qml/Main.qml       |  1 -
 src/rooms/RoomListPage.qml | 70 +++++++++++++++++++++++++++++---------
 2 files changed, 54 insertions(+), 17 deletions(-)

diff --git a/src/app/qml/Main.qml b/src/app/qml/Main.qml
index ea8955674..6eed271c1 100644
--- a/src/app/qml/Main.qml
+++ b/src/app/qml/Main.qml
@@ -45,7 +45,6 @@ Kirigami.ApplicationWindow {
             showExisting: true
             onConnectionChosen: root.load()
         }
-        columnView.columnResizeMode: pageStack.wideMode ? Kirigami.ColumnView.DynamicColumns : Kirigami.ColumnView.SingleColumn
         globalToolBar.canContainHandles: true
         globalToolBar {
             style: Kirigami.ApplicationHeaderStyle.ToolBar
diff --git a/src/rooms/RoomListPage.qml b/src/rooms/RoomListPage.qml
index 2ac211fd5..f5586d789 100644
--- a/src/rooms/RoomListPage.qml
+++ b/src/rooms/RoomListPage.qml
@@ -17,22 +17,13 @@ import org.kde.neochat
 Kirigami.Page {
     id: root
 
-    Kirigami.ColumnView.interactiveResizeEnabled: true
-    Kirigami.ColumnView.minimumWidth: _private.collapsedSize + spaceDrawer.width + 1
-    Kirigami.ColumnView.maximumWidth: _private.defaultWidth + spaceDrawer.width + 1
-    Kirigami.ColumnView.onInteractiveResizingChanged: {
-        if (!Kirigami.ColumnView.interactiveResizing && collapsed) {
-            Kirigami.ColumnView.preferredWidth = root.Kirigami.ColumnView.minimumWidth;
-        }
-    }
-    Kirigami.ColumnView.preferredWidth: _private.currentWidth + spaceDrawer.width + 1
-    Kirigami.ColumnView.onPreferredWidthChanged: {
-        if (width > _private.collapseWidth) {
-            NeoChatConfig.collapsed = false;
-        } else if (Kirigami.ColumnView.interactiveResizing) {
-            NeoChatConfig.collapsed = true;
-        }
-    }
+    /**
+     * @brief The current width of the room list.
+     *
+     * @note Other objects can access the value but the private function makes sure
+     *       that only the internal members can modify it.
+     */
+    readonly property int currentWidth: _private.currentWidth + spaceDrawer.width + 1
 
     required property NeoChatConnection connection
 
@@ -40,6 +31,10 @@ Kirigami.Page {
 
     signal search
 
+    onCurrentWidthChanged: pageStack.defaultColumnWidth = root.currentWidth
+    Component.onCompleted: pageStack.defaultColumnWidth = root.currentWidth
+
+
     onCollapsedChanged: {
         if (collapsed) {
             RoomManager.sortFilterRoomTreeModel.filterText = "";
@@ -252,6 +247,49 @@ Kirigami.Page {
         sourceComponent: Kirigami.Settings.isMobile ? exploreComponentMobile : userInfoDesktop
     }
 
+    MouseArea {
+        anchors.top: parent.top
+        anchors.bottom: parent.bottom
+        parent: applicationWindow().overlay.parent
+
+        x: root.currentWidth - width / 2
+        width: Kirigami.Units.smallSpacing * 2
+        z: root.z + 1
+        enabled: RoomManager.hasOpenRoom && applicationWindow().width >= Kirigami.Units.gridUnit * 35
+        visible: enabled
+        cursorShape: Qt.SplitHCursor
+
+        property int _lastX
+
+        onPressed: mouse => {
+            _lastX = mouse.x;
+        }
+        onPositionChanged: mouse => {
+            if (_lastX == -1) {
+                return;
+            }
+            if (mouse.x > _lastX) {
+                // we moved to the right
+                if (_private.currentWidth < _private.collapseWidth && _private.currentWidth + (mouse.x - _lastX) >= _private.collapseWidth) {
+                    // Here we get back directly to a more wide mode.
+                    _private.currentWidth = _private.defaultWidth;
+                    NeoChatConfig.collapsed = false;
+                } else if (_private.currentWidth >= _private.collapseWidth) {
+                    // Increase page width
+                    _private.currentWidth = Math.min(_private.defaultWidth, _private.currentWidth + (mouse.x - _lastX));
+                }
+            } else if (mouse.x < _lastX) {
+                const tmpWidth = _private.currentWidth - (_lastX - mouse.x);
+                if (tmpWidth < _private.collapseWidth) {
+                    _private.currentWidth = Qt.binding(() => _private.collapsedSize);
+                    NeoChatConfig.collapsed = true;
+                } else {
+                    _private.currentWidth = tmpWidth;
+                }
+            }
+        }
+    }
+
     Component {
         id: userInfo
         UserInfo {
-- 
2.50.1