CppEditor: Rework showing/switching parse configurations

* Move the combox box for switching the parse configurations out of the
  "Additional Preprocessor Directives" dialog ('#'-button) to make it
  better visible/accessible. Also, decouple the extra preprocessor
  directives from the concrete parse context since this is not anymore
  in same dialog.
* The combo box appears only if multiple parse configurations are
  available for a file.
* The first time multiple parse configurations are detected, an info bar
  is shown that points the user to the combox box. A "Do Not Show Again"
  button is provided.
* Upon selecting an entry, the preferred parse configuration is saved as
  part of the session. The setting can be cleared with the context menu
  entry on the combo box.

Follow-up changes need to ensure that the display name and/or tooltip is
unambiguous, e.g. for qbs and cmake projects.

Change-Id: I9e9773704187291524ad7b605bfdddd83ef5b19d
Reviewed-by: David Schulz <david.schulz@qt.io>

1 files changed, 83 insertions, 0 deletions

diff --git a/src/plugins/cppeditor/cppparsecontext.h b/src/plugins/cppeditor/cppparsecontext.h
new file mode 100644
index 0000000000..4c6cc95e9d
--- /dev/null
+++ b/src/plugins/cppeditor/cppparsecontext.h
@@ -0,0 +1,83 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of 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.
+**
+****************************************************************************/
+
+#pragma once
+
+#include <cpptools/cpptools_utils.h>
+
+#include <QAbstractListModel>
+#include <QComboBox>
+
+namespace CppEditor {
+namespace Internal {
+
+class ParseContextModel : public QAbstractListModel
+{
+    Q_OBJECT
+
+public:
+    void update(const CppTools::ProjectPartInfo &projectPartInfo);
+
+    void setPreferred(int index);
+    void clearPreferred();
+
+    int currentIndex() const;
+    bool isCurrentPreferred() const;
+
+    QString currentId() const;
+    QString currentToolTip() const;
+
+    bool areMultipleAvailable() const;
+
+signals:
+    void updated(bool areMultipleAvailable);
+    void preferredParseContextChanged(const QString &id);
+
+private:
+    void reset(const CppTools::ProjectPartInfo &projectPartInfo);
+    int rowCount(const QModelIndex &parent) const override;
+    QVariant data(const QModelIndex &index, int role) const override;
+
+private:
+    CppTools::ProjectPartInfo::Hints m_hints;
+    QList<CppTools::ProjectPart::Ptr> m_projectParts;
+    int m_currentIndex = -1;
+};
+
+class ParseContextWidget : public QComboBox
+{
+    Q_OBJECT
+
+public:
+    ParseContextWidget(ParseContextModel &parseContextModel, QWidget *parent);
+    void syncToModel();
+
+private:
+    ParseContextModel &m_parseContextModel;
+    QAction *m_clearPreferredAction = nullptr;
+};
+
+} // namespace Internal
+} // namespace CppEditor