Adding a QHeaderView benchmark

This is a small QHeaderView benchmark.

It measures visualIndexAt, hideSection, showSecion, moveSection,
insert, remove and trunc rows.

Change-Id: Ibca6a2e130f4ab27d68f51e5e341a78579abd1bf
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>

tests/benchmarks/gui/itemviews/itemviews.pro

@@ -1,3 +1,4 @@
 TEMPLATE = subdirs
 SUBDIRS = \
-        qtableview
+        qtableview \
+        qheaderview

tests/benchmarks/gui/itemviews/qheaderview/qheaderview.pro

@@ -0,0 +1,7 @@
+QT += widgets testlib
+
+TEMPLATE = app
+TARGET = bench_qheaderview
+
+SOURCES += qheaderviewbench.cpp
+

tests/benchmarks/gui/itemviews/qheaderview/qheaderviewbench.cpp

@@ -0,0 +1,264 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Thorbjørn Lund Martsum - tmartsum[at]gmail.com
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtTest/QtTest>
+#include <QtWidgets/QtWidgets>
+
+class BenchQHeaderView : public QObject
+{
+    Q_OBJECT
+public:
+    BenchQHeaderView() : QObject() {m_tv = 0; m_hv = 0; m_model = 0;}
+
+protected:
+    QTableView *m_tv;
+    QHeaderView *m_hv;
+    QStandardItemModel *m_model;
+    QStandardItemModel m_normalmodel;
+    QElapsedTimer t;
+    bool m_worst_case;
+    void setupTestData();
+
+    bool m_blockSomeSignals;
+    bool m_updatesEnabled;
+    int m_rowcount;
+    int m_colcount;
+
+
+private slots:
+    void init();
+    void cleanupTestCase();
+    void initTestCase();
+    void cleanup();
+    void visualIndexAtSpecial_data()   {setupTestData();}
+    void visualIndexAt_data()          {setupTestData();}
+    void hideShowBench_data()          {setupTestData();}
+    void swapSectionsBench_data()      {setupTestData();}
+    void moveSectionBench_data()       {setupTestData();}
+    void defaultSizeBench_data()       {setupTestData();}
+    void removeBench_data()            {setupTestData();}
+    void insertBench_data()            {setupTestData();}
+    void truncBench_data()             {setupTestData();}
+
+    void visualIndexAtSpecial();
+    void visualIndexAt();
+    void hideShowBench();
+    void swapSectionsBench();
+    void moveSectionBench();
+    void defaultSizeBench();
+    void removeBench();
+    void insertBench();
+    void truncBench();
+};
+
+void BenchQHeaderView::setupTestData()
+{
+    QTest::addColumn<bool>("worst_case");
+    QTest::newRow("Less relevant best case") << false;
+    QTest::newRow("__* More important worst case *__") << true;
+}
+
+void BenchQHeaderView::initTestCase()
+{
+    m_tv = new QTableView();
+    m_hv = m_tv->verticalHeader();
+    m_model = &m_normalmodel;
+    m_tv->setModel(m_model);
+    m_tv->show();
+}
+
+void BenchQHeaderView::cleanupTestCase()
+{
+    delete m_tv;
+    m_tv = 0;
+    m_hv = 0;
+}
+
+void BenchQHeaderView::init()
+{
+    QFETCH(bool, worst_case);
+
+    m_blockSomeSignals = true;
+    m_updatesEnabled = false;
+    m_rowcount = 2500;
+    m_colcount = 10;
+
+    m_worst_case = worst_case;
+    m_model->clear();
+    if (worst_case) {
+        for (int  u = 0; u <= m_rowcount; ++u) // ensures fragment in Qt 4.x
+            m_model->setRowCount(u);
+        m_model->setColumnCount(m_colcount);
+        m_hv->swapSections(0, m_rowcount - 1);
+        m_hv->hideSection(m_rowcount / 2);
+    } else {
+        m_model->setColumnCount(m_colcount);
+        m_model->setRowCount(m_rowcount);
+    }
+
+    QString s;
+    for (int i = 0; i < m_model->rowCount(); ++i) {
+        m_model->setData(m_model->index(i, 0), QVariant(i));
+        s.setNum(i);
+        s += ".";
+        s += 'a' + (i % 25);
+        m_model->setData(m_model->index(i, 1), QVariant(s));
+    }
+    m_tv->setUpdatesEnabled(m_updatesEnabled);
+    m_hv->blockSignals(m_blockSomeSignals);
+
+    const int default_section_size = 25;
+    m_hv->setDefaultSectionSize(default_section_size);
+}
+
+void BenchQHeaderView::cleanup()
+{
+    m_tv->setUpdatesEnabled(true);
+    m_hv->blockSignals(false);
+}
+
+void BenchQHeaderView::visualIndexAtSpecial()
+{
+    int lookup_pos = m_hv->length() - 50;
+    int testnum = 0;
+
+    QBENCHMARK {
+            ++testnum;
+            m_hv->resizeSection(0, testnum % 47);
+            m_hv->visualIndexAt(lookup_pos);
+    }
+}
+
+void BenchQHeaderView::visualIndexAt()
+{
+    const int center_pos = m_hv->length() / 2;
+    const int maxpos = m_hv->length() - 1;
+
+    QBENCHMARK {
+        m_hv->visualIndexAt(0);
+        m_hv->visualIndexAt(center_pos);
+        m_hv->visualIndexAt(maxpos);
+    }
+}
+
+void BenchQHeaderView::hideShowBench()
+{
+    int n = 0;
+    bool hide_set = true;
+
+    QBENCHMARK {
+        m_hv->setSectionHidden(n, hide_set);
+        if (n >= m_hv->count()) {
+            n = -1;
+            hide_set = !hide_set;
+        }
+        ++n;
+    }
+}
+
+void BenchQHeaderView::swapSectionsBench()
+{
+    int n = 0;
+    QBENCHMARK {
+        m_hv->swapSections(n, n + 1);
+        if (++n >= m_hv->count())
+            n = 0;
+    }
+}
+
+void BenchQHeaderView::moveSectionBench()
+{
+    QBENCHMARK {
+        m_hv->moveSection(0, m_hv->count() - 2);
+    }
+}
+
+void BenchQHeaderView::defaultSizeBench()
+{
+    int n = 1;
+    QBENCHMARK {
+        m_hv->setDefaultSectionSize(n);
+        ++n;
+    }
+}
+
+void BenchQHeaderView::removeBench()
+{
+    QBENCHMARK {
+        m_model->removeRows(0, 1);
+        if (m_hv->count() == 0) { // setup a new hard model
+            m_model->setRowCount(m_rowcount);
+            if (m_worst_case) {
+                m_hv->swapSections(0, m_rowcount - 1);
+                m_hv->hideSection(m_rowcount / 2);
+            }
+        }
+    }
+}
+
+void BenchQHeaderView::insertBench()
+{
+    QBENCHMARK {
+        m_model->insertRows(1, 1);
+        if (m_hv->count() == 10000000) { // setup a new hard model
+            m_model->setRowCount(m_rowcount);
+            if (m_worst_case) {
+                m_hv->swapSections(0, m_rowcount - 1);
+                m_hv->hideSection(m_rowcount / 2);
+            }
+        }
+    }
+}
+
+void BenchQHeaderView::truncBench()
+{
+    QBENCHMARK {
+        m_model->setRowCount(1);
+        m_model->setRowCount(m_rowcount);
+        if (m_worst_case) {
+            m_hv->swapSections(0, m_rowcount - 1);
+            m_hv->hideSection(m_rowcount / 2);
+        }
+    }
+}
+
+QTEST_MAIN(BenchQHeaderView)
+#include "qheaderviewbench.moc"