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 {

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();
+};