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

3 files changed, 90 insertions, 0 deletions

diff --git a/src/MainWindow.cpp b/src/MainWindow.cpp

index 872e61f8..f3893998 100644
--- a/src/MainWindow.cpp
+++ b/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");
diff --git a/src/ui/NhekoEventObserver.cpp b/src/ui/NhekoEventObserver.cpp
new file mode 100644

index 00000000..5e67cec4
--- /dev/null
+++ b/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;
+}
diff --git a/src/ui/NhekoEventObserver.h b/src/ui/NhekoEventObserver.h
new file mode 100644

index 00000000..6d14f30f
--- /dev/null
+++ b/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();
+};