Use ListView without scrollview for messages

That way we can autohide the scollbar if needed, it should fix some
jumping issues, it makes it possible to flick on mobile, etc.

Some related bugs:

https://bugreports.qt.io/browse/QTBUG-75223
https://bugreports.qt.io/browse/QTBUG-44902

CMakeLists.txt

@@ -336,6 +336,7 @@ set(SRC_FILES
 	src/ui/MxcAnimatedImage.cpp
 	src/ui/MxcMediaProxy.cpp
 	src/ui/NhekoCursorShape.cpp
+	src/ui/NhekoEventObserver.cpp
 	src/ui/NhekoDropArea.cpp
 	src/ui/NhekoGlobalObject.cpp
 	src/ui/RoomSettings.cpp
@@ -532,6 +533,7 @@ qt5_wrap_cpp(MOC_HEADERS
 	src/ui/MxcAnimatedImage.h
 	src/ui/MxcMediaProxy.h
 	src/ui/NhekoCursorShape.h
+	src/ui/NhekoEventObserver.h
 	src/ui/NhekoDropArea.h
 	src/ui/NhekoGlobalObject.h
 	src/ui/RoomSettings.h

resources/qml/Avatar.qml

@@ -105,6 +105,7 @@ Rectangle {
         id: mouseArea
 
         onSingleTapped: avatar.clicked(eventPoint)
+        dragThreshold: 0
     }
 
     Ripple {

resources/qml/MessageView.qml

@@ -14,16 +14,32 @@ import QtQuick.Layouts 1.2
 import QtQuick.Window 2.13
 import im.nheko 1.0
 
-ScrollView {
-    clip: false
-    palette: Nheko.colors
-    padding: 8
-    ScrollBar.horizontal.visible: false
+
+Item {
+    id: chatRoot
+    property int padding: Nheko.paddingMedium
+
+    property int availableWidth: width
+
+    ScrollBar {
+        id: scrollbar
+        interactive: !touchObserver.wasTouched
+        parent: chat.parent
+        anchors.top: parent.top
+        anchors.right: parent.right
+        anchors.bottom: parent.bottom
+    }
+
+    EventObserver {
+        id: touchObserver
+        anchors.fill: parent
 
         ListView {
             id: chat
 
-        property int delegateMaxWidth: ((Settings.timelineMaxWidth > 100 && Settings.timelineMaxWidth < parent.availableWidth) ? Settings.timelineMaxWidth : parent.availableWidth) - parent.padding * 2
+            anchors.fill: parent
+
+            property int delegateMaxWidth: ((Settings.timelineMaxWidth > 100 && Settings.timelineMaxWidth < chatRoot.availableWidth) ? Settings.timelineMaxWidth : chatRoot.availableWidth) - chatRoot.padding * 2 - scrollbar.width
 
             displayMarginBeginning: height / 2
             displayMarginEnd: height / 2
@@ -32,16 +48,19 @@ ScrollView {
             //onModelChanged: if (room) room.sendReset()
             //reuseItems: true
             boundsBehavior: Flickable.StopAtBounds
-        pixelAligned: true
+            //pixelAligned: true
             spacing: 2
             verticalLayoutDirection: ListView.BottomToTop
             onCountChanged: {
                 // Mark timeline as read
-            if (atYEnd && room)
-                model.currentIndex = 0;
+                if (atYEnd && room) model.currentIndex = 0;
 
             }
 
+            ScrollBar.vertical: scrollbar
+
+            anchors.rightMargin: scrollbar.interactive ? scrollbar.width : 0
+
             Rectangle {
                 //closePolicy: Popup.NoAutoClose
 
@@ -164,7 +183,6 @@ ScrollView {
             ScrollHelper {
                 flickable: parent
                 anchors.fill: parent
-            enabled: !Settings.mobileMode
             }
 
             Shortcut {
@@ -323,6 +341,7 @@ ScrollView {
 
                             TapHandler {
                                 onSingleTapped: chat.model.openUserProfile(userId)
+                                dragThreshold: 0
                             }
 
                             CursorShape {
@@ -553,6 +572,7 @@ ScrollView {
             }
 
         }
+    }
 
     Platform.Menu {
         id: messageContextMenu
@@ -732,5 +752,4 @@ ScrollView {
         }
 
     }
-
 }

src/MainWindow.cpp

@@ -49,6 +49,7 @@
 #include "ui/MxcMediaProxy.h"
 #include "ui/NhekoCursorShape.h"
 #include "ui/NhekoDropArea.h"
+#include "ui/NhekoEventObserver.h"
 #include "ui/NhekoGlobalObject.h"
 #include "ui/UIA.h"
 #include "voip/WebRTCSession.h"
@@ -164,6 +165,7 @@ MainWindow::registerQmlTypes()
     qmlRegisterType<DelegateChooser>("im.nheko", 1, 0, "DelegateChooser");
     qmlRegisterType<NhekoDropArea>("im.nheko", 1, 0, "NhekoDropArea");
     qmlRegisterType<NhekoCursorShape>("im.nheko", 1, 0, "CursorShape");
+    qmlRegisterType<NhekoEventObserver>("im.nheko", 1, 0, "EventObserver");
     qmlRegisterType<MxcAnimatedImage>("im.nheko", 1, 0, "MxcAnimatedImage");
     qmlRegisterType<MxcMediaProxy>("im.nheko", 1, 0, "MxcMedia");
     qmlRegisterType<RoomDirectoryModel>("im.nheko", 1, 0, "RoomDirectoryModel");

src/ui/NhekoEventObserver.cpp

@@ -0,0 +1,61 @@
+// SPDX-FileCopyrightText: 2021 Nheko Contributors
+// SPDX-FileCopyrightText: 2022 Nheko Contributors
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "NhekoEventObserver.h"
+
+#include <QMouseEvent>
+
+#include "Logging.h"
+
+NhekoEventObserver::NhekoEventObserver(QQuickItem *parent)
+  : QQuickItem(parent)
+{
+    setFiltersChildMouseEvents(true);
+}
+
+bool
+NhekoEventObserver::childMouseEventFilter(QQuickItem * /*item*/, QEvent *event)
+{
+    // nhlog::ui()->debug("Touched {}", item->metaObject()->className());
+
+    auto setTouched = [this](bool touched) {
+        if (touched != this->wasTouched_) {
+            this->wasTouched_ = touched;
+            emit wasTouchedChanged();
+        }
+    };
+
+    // see
+    // https://code.qt.io/cgit/qt/qtdeclarative.git/tree/src/quicktemplates2/qquickscrollview.cpp?id=7f29e89c26ae2babc358b1c4e6f965af6ec759f4#n471
+    switch (event->type()) {
+    case QEvent::TouchBegin:
+    case QEvent::TouchEnd:
+        setTouched(true);
+        break;
+
+    case QEvent::MouseButtonPress:
+        if (static_cast<QMouseEvent *>(event)->source() == Qt::MouseEventNotSynthesized) {
+            setTouched(false);
+        }
+        break;
+
+    case QEvent::MouseMove:
+    case QEvent::MouseButtonRelease:
+        if (static_cast<QMouseEvent *>(event)->source() == Qt::MouseEventNotSynthesized)
+            setTouched(false);
+        break;
+
+    case QEvent::HoverEnter:
+    case QEvent::HoverMove:
+    case QEvent::Wheel:
+        setTouched(false);
+        break;
+
+    default:
+        break;
+    }
+
+    return false;
+}

src/ui/NhekoEventObserver.h

@@ -0,0 +1,27 @@
+// SPDX-FileCopyrightText: 2022 Nheko Contributors
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <QQuickItem>
+
+class NhekoEventObserver : public QQuickItem
+{
+    Q_OBJECT
+
+    Q_PROPERTY(bool wasTouched READ wasTouched NOTIFY wasTouchedChanged)
+
+public:
+    explicit NhekoEventObserver(QQuickItem *parent = 0);
+
+    bool childMouseEventFilter(QQuickItem *item, QEvent *event) override;
+
+private:
+    bool wasTouched() { return wasTouched_; }
+
+    bool wasTouched_ = false;
+
+signals:
+    void wasTouchedChanged();
+};