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diff --git a/src/datasources/qmldesignerusagetimesource.cpp b/src/datasources/qmldesignerusagetimesource.cpp
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+++ b/src/datasources/qmldesignerusagetimesource.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of UsageStatistic plugin for Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+#include "qmldesignerusagetimesource.h"
+
+#include <QtCore/QFileInfo>
+
+#include <coreplugin/editormanager/editormanager.h>
+#include <coreplugin/editormanager/ieditor.h>
+#include <coreplugin/modemanager.h>
+#include <coreplugin/imode.h>
+
+namespace UsageStatistic {
+namespace Internal {
+
+static QString currentModeName()
+{
+    if (auto modeManager = Core::ModeManager::instance()) {
+        if (auto mode = modeManager->currentMode()) {
+            return mode->displayName().toLower();
+        }
+    }
+
+    return {};
+}
+
+QmlDesignerUsageTimeSource::QmlDesignerUsageTimeSource()
+    : TimeUsageSourceBase(QStringLiteral("qmlDesignerUsageTime"))
+{
+    connect(Core::ModeManager::instance(), &Core::ModeManager::currentModeChanged,
+            this, [this](Core::Id modeId){
+                      updateTrackingState(QString::fromUtf8(modeId.name().toLower())); });
+
+    connect(Core::EditorManager::instance(), &Core::EditorManager::currentEditorChanged,
+            this, [this](){ updateTrackingState(currentModeName()); });
+}
+
+QmlDesignerUsageTimeSource::~QmlDesignerUsageTimeSource() = default;
+
+QString QmlDesignerUsageTimeSource::name() const
+{
+    return tr("Qt Quick Designer usage time");
+}
+
+QString QmlDesignerUsageTimeSource::description() const
+{
+    return tr("How much time you spent editing QML files in Design mode.");
+}
+
+static bool isDesignMode(const QString &modeName)
+{
+    static const QString designModeName = QStringLiteral("design");
+    return modeName == designModeName;
+}
+
+static bool editingQmlFile()
+{
+    static const QSet<QString> validExtentions = {"qml", "qml.ui"};
+    static const QString validMimeType = "qml";
+
+    if (auto document = Core::EditorManager::currentDocument()) {
+        QString mimeType = document->mimeType().toLower();
+        QString extension = document->filePath().toFileInfo().completeSuffix().toLower();
+
+        return validExtentions.contains(extension) || mimeType.contains(validMimeType);
+    }
+
+    return false;
+}
+
+void QmlDesignerUsageTimeSource::updateTrackingState(const QString &modeName)
+{
+    if (isDesignMode(modeName) && editingQmlFile() && !isTimeTrackingActive()) {
+        Q_EMIT start();
+    } else {
+        Q_EMIT stop();
+    }
+}
+
+} // namespace Internal
+} // namespace UsageStatistic