CppEditor: Show info bar for project-less file

While at it, centralize the code for handling the info bars and actions.

Change-Id: Ied62e3db268aaff3ef87e246bfe2b50399341be3
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/cppeditor/cppminimizableinfobars.cpp

@@ -0,0 +1,182 @@
+/****************************************************************************
+**
+** 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.
+**
+****************************************************************************/
+
+#include "cppminimizableinfobars.h"
+
+#include "cppeditorconstants.h"
+
+#include <QTimer>
+#include <QToolButton>
+
+#include <coreplugin/id.h>
+#include <coreplugin/infobar.h>
+
+#include <cpptools/cpptoolssettings.h>
+
+#include <utils/utilsicons.h>
+#include <utils/qtcassert.h>
+
+using namespace Core;
+using namespace CppTools;
+
+namespace CppEditor {
+namespace Internal {
+
+static CppToolsSettings *settings() { return CppToolsSettings::instance(); }
+
+MinimizableInfoBars::MinimizableInfoBars(InfoBar &infoBar, QObject *parent)
+    : QObject(parent)
+    , m_infoBar(infoBar)
+{
+    connect(settings(), &CppToolsSettings::showHeaderErrorInfoBarChanged,
+            this, &MinimizableInfoBars::updateHeaderErrors);
+    connect(settings(), &CppToolsSettings::showNoProjectInfoBarChanged,
+            this, &MinimizableInfoBars::updateNoProjectConfiguration);
+}
+
+MinimizableInfoBars::Actions MinimizableInfoBars::createShowInfoBarActions(
+        const ActionCreator &actionCreator)
+{
+    Actions result;
+    QTC_ASSERT(actionCreator, return result);
+
+    // No project configuration available
+    auto *button = new QToolButton();
+    button->setToolTip(tr("File is not part of any project."));
+    button->setIcon(Utils::Icons::WARNING_TOOLBAR.pixmap());
+    connect(button, &QAbstractButton::clicked, []() {
+        settings()->setShowNoProjectInfoBar(true);
+    });
+    QAction *action = actionCreator(button);
+    action->setVisible(!settings()->showNoProjectInfoBar());
+    result.insert(Constants::NO_PROJECT_CONFIGURATION, action);
+
+    // Errors in included files
+    button = new QToolButton();
+    button->setToolTip(tr("File contains errors in included files."));
+    button->setIcon(Utils::Icons::WARNING_TOOLBAR.pixmap());
+    connect(button, &QAbstractButton::clicked, []() {
+        settings()->setShowHeaderErrorInfoBar(true);
+    });
+    action = actionCreator(button);
+    action->setVisible(!settings()->showHeaderErrorInfoBar());
+    result.insert(Constants::ERRORS_IN_HEADER_FILES, action);
+
+    return result;
+}
+
+void MinimizableInfoBars::processHeaderDiagnostics(
+        const DiagnosticWidgetCreator &diagnosticWidgetCreator)
+{
+    m_diagnosticWidgetCreator = diagnosticWidgetCreator;
+    updateHeaderErrors();
+}
+
+void MinimizableInfoBars::processHasProjectPart(bool hasProjectPart)
+{
+    m_hasProjectPart = hasProjectPart;
+    updateNoProjectConfiguration();
+}
+
+void MinimizableInfoBars::updateHeaderErrors()
+{
+    const Id id(Constants::ERRORS_IN_HEADER_FILES);
+    m_infoBar.removeInfo(id);
+
+    bool show = false;
+    // Show the info entry only if there is a project configuration.
+    if (m_hasProjectPart && m_diagnosticWidgetCreator) {
+        if (settings()->showHeaderErrorInfoBar())
+            addHeaderErrorEntry(id, m_diagnosticWidgetCreator);
+        else
+            show = true;
+    }
+
+    emit showAction(id, show);
+}
+
+void MinimizableInfoBars::updateNoProjectConfiguration()
+{
+    const Id id(Constants::NO_PROJECT_CONFIGURATION);
+    m_infoBar.removeInfo(id);
+
+    bool show = false;
+    if (!m_hasProjectPart) {
+        if (settings()->showNoProjectInfoBar())
+            addNoProjectConfigurationEntry(id);
+        else
+            show = true;
+    }
+
+    emit showAction(id, show);
+}
+
+static InfoBarEntry createMinimizableInfo(const Id &id,
+                                          const QString &text,
+                                          std::function<void()> minimizer)
+{
+    QTC_CHECK(minimizer);
+
+    InfoBarEntry info(id, text);
+    info.setShowDefaultCancelButton(false);
+    // The minimizer() might delete the "Minimize" button immediately and as
+    // result invalid reads will happen in QToolButton::mouseReleaseEvent().
+    // Avoid this by running the minimizer in the next event loop iteration.
+    info.setCustomButtonInfo(MinimizableInfoBars::tr("Minimize"), [=](){
+        QTimer::singleShot(0, [=] {
+            minimizer();
+        });
+    });
+
+    return info;
+}
+
+void MinimizableInfoBars::addNoProjectConfigurationEntry(const Id &id)
+{
+    const QString text = tr("<b>Warning</b>: This file is not part of any project. "
+                            "The code model might have issues to parse this file properly.");
+
+    m_infoBar.addInfo(createMinimizableInfo(id, text, []() {
+        settings()->setShowNoProjectInfoBar(false);
+    }));
+}
+
+void MinimizableInfoBars::addHeaderErrorEntry(const Id &id,
+        const DiagnosticWidgetCreator &diagnosticWidgetCreator)
+{
+    const QString text = tr("<b>Warning</b>: The code model could not parse an included file, "
+                            "which might lead to slow or incorrect code completion and "
+                            "highlighting, for example.");
+
+    InfoBarEntry info = createMinimizableInfo(id, text, []() {
+        settings()->setShowHeaderErrorInfoBar(false);
+    });
+    info.setDetailsWidgetCreator(diagnosticWidgetCreator);
+
+    m_infoBar.addInfo(info);
+}
+
+} // namespace Internal
+} // namespace CppEditor