add QSFP to hide empty rows in eventmodel

The favourites and tracepoint patches include some rows in the model
that may be empty. To keep the code simple an readable all rows will be
shown. Then a proxy model is put ontop to remove empty rows.

src/models/CMakeLists.txt

@@ -10,6 +10,7 @@ add_library(
     disassemblymodel.cpp
     disassemblyoutput.cpp
     eventmodel.cpp
+    eventmodelproxy.cpp
     filterandzoomstack.cpp
     frequencymodel.cpp
     highlighter.cpp

src/models/eventmodelproxy.cpp

@@ -0,0 +1,21 @@
+/*
+    SPDX-FileCopyrightText: Lieven Hey <[email protected]>
+    SPDX-FileCopyrightText: 2023 Klarälvdalens Datakonsult AB, a KDAB Group company, [email protected]
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
+
+#include "eventmodelproxy.h"
+
+EventModelProxy::EventModelProxy(QObject* parent)
+    : QSortFilterProxyModel(parent)
+{
+}
+
+EventModelProxy::~EventModelProxy() = default;
+
+bool EventModelProxy::filterAcceptsRow(int source_row, const QModelIndex& source_parent) const
+{
+    Q_UNUSED(source_row);
+    return source_parent.isValid();
+}

src/models/eventmodelproxy.h

@@ -0,0 +1,22 @@
+/*
+    SPDX-FileCopyrightText: Lieven Hey <[email protected]>
+    SPDX-FileCopyrightText: 2023 Klarälvdalens Datakonsult AB, a KDAB Group company, [email protected]
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
+
+#pragma once
+
+#include <QSortFilterProxyModel>
+
+class EventModelProxy : public QSortFilterProxyModel
+{
+    Q_OBJECT
+public:
+public:
+    EventModelProxy(QObject* parent);
+    ~EventModelProxy() override;
+
+protected:
+    bool filterAcceptsRow(int source_row, const QModelIndex& source_parent) const override;
+};

src/timelinewidget.cpp

@@ -9,6 +9,7 @@
 
 #include "filterandzoomstack.h"
 #include "models/eventmodel.h"
+#include "models/eventmodelproxy.h"
 #include "resultsutil.h"
 #include "timelinedelegate.h"
 
@@ -61,7 +62,7 @@ TimeLineWidget::TimeLineWidget(PerfParser* parser, QMenu* filterMenu, FilterAndZ
     ui->setupUi(this);
 
     auto* eventModel = new EventModel(this);
-    auto* timeLineProxy = new QSortFilterProxyModel(this);
+    auto* timeLineProxy = new EventModelProxy(this);
     timeLineProxy->setRecursiveFilteringEnabled(true);
     timeLineProxy->setSourceModel(eventModel);
     timeLineProxy->setSortRole(EventModel::SortRole);