Meson: Flatten directory hierarchy

Keep tests/ and icons/ but put the rest into the toplevel.

The previous setup was so different from the rest of the bunch that
it regularly stuck out in maintenance tasks.

Change-Id: I69821be6268f69682353a388f6bb1fa343215303
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/mesonprojectmanager/toolkitaspectwidget.h

@@ -0,0 +1,68 @@
+// Copyright (C) 2020 Alexis Jeandet.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
+#pragma once
+
+#include "mesontoolkitaspect.h"
+#include "mesonwrapper.h"
+#include "ninjatoolkitaspect.h"
+
+#include <projectexplorer/kitmanager.h>
+
+#include <utils/layoutbuilder.h>
+
+#include <QComboBox>
+#include <QCoreApplication>
+
+namespace MesonProjectManager {
+namespace Internal {
+
+class ToolKitAspectWidget final : public ProjectExplorer::KitAspectWidget
+{
+    Q_DECLARE_TR_FUNCTIONS(MesonProjectManager::Internal::ToolKitAspect)
+public:
+    enum class ToolType { Meson, Ninja };
+
+    ToolKitAspectWidget(ProjectExplorer::Kit *kit,
+                        const ProjectExplorer::KitAspect *ki,
+                        ToolType type);
+    ~ToolKitAspectWidget();
+
+private:
+    void addTool(const MesonTools::Tool_t &tool);
+    void removeTool(const MesonTools::Tool_t &tool);
+    void setCurrentToolIndex(int index);
+    int indexOf(const Utils::Id &id);
+    bool isCompatible(const MesonTools::Tool_t &tool);
+    void loadTools();
+    void setToDefault();
+
+    void makeReadOnly() override { m_toolsComboBox->setEnabled(false); }
+
+    void addToLayout(Utils::LayoutBuilder &builder) override
+    {
+        addMutableAction(m_toolsComboBox);
+        builder.addItem(m_toolsComboBox);
+        builder.addItem(m_manageButton);
+    }
+
+    void refresh() override
+    {
+        const auto id = [this]() {
+            if (m_type == ToolType::Meson)
+                return MesonToolKitAspect::mesonToolId(m_kit);
+            return NinjaToolKitAspect::ninjaToolId(m_kit);
+        }();
+        if (id.isValid())
+            m_toolsComboBox->setCurrentIndex(indexOf(id));
+        else {
+            setToDefault();
+        }
+    }
+
+    QComboBox *m_toolsComboBox;
+    QWidget *m_manageButton;
+    ToolType m_type;
+};
+
+} // namespace Internal
+} // namespace MesonProjectManager