New controller for WarningSign to unify the usage across the project.

GUI/coregui/Views/InfoWidgets/WarningSign.cpp

+// ************************************************************************** //
+//
+//  BornAgain: simulate and fit scattering at grazing incidence
+//
+//! @file      GUI/coregui/Views/InfoWidgets/WarningSign.cpp
+//! @brief     Implements class WarningSign
+//!
+//! @homepage  http://www.bornagainproject.org
+//! @license   GNU General Public License v3 or higher (see COPYING)
+//! @copyright Forschungszentrum Jülich GmbH 2016
+//! @authors   Scientific Computing Group at MLZ Garching
+//! @authors   Céline Durniak, Marina Ganeva, David Li, Gennady Pospelov
+//! @authors   Walter Van Herck, Joachim Wuttke
+//
+// ************************************************************************** //
+
+#include "WarningSign.h"
+#include "WarningSignWidget.h"
+#include <QAbstractScrollArea>
+#include <QEvent>
+#include <QScrollBar>
+
+namespace {
+const int xpos_offset = 38;
+const int ypos_offset = 38;
+}
+
+WarningSign::WarningSign(QWidget* parent)
+    : QObject(parent)
+    , m_warning_header(QStringLiteral("Houston, we have a problem."))
+    , m_warningWidget(0)
+    , m_area(nullptr)
+{
+    setArea(parent);
+}
+
+//! Clears warning message;
+
+void WarningSign::clear()
+{
+    delete m_warningWidget;
+    m_warningWidget = 0;
+    m_warning_message.clear();
+}
+
+void WarningSign::setWarningHeader(const QString& warningHeader)
+{
+    m_warning_header = warningHeader;
+}
+
+void WarningSign::setWarningMessage(const QString& warningMessage)
+{
+    Q_ASSERT(m_area);
+
+    m_warning_message = warningMessage;
+
+    if (!m_warningWidget)
+        m_warningWidget = new WarningSignWidget(m_area);
+
+    m_warningWidget->setWarningMessage(m_warning_message);
+    updateLabelGeometry();
+    m_warningWidget->show();
+}
+
+void WarningSign::setArea(QWidget* area)
+{
+    m_area = area;
+    m_area->installEventFilter(this);
+}
+
+bool WarningSign::eventFilter(QObject* obj, QEvent* event)
+{
+    if (event->type() == QEvent::Resize)
+        updateLabelGeometry();
+
+    return QObject::eventFilter(obj, event);
+}
+
+void WarningSign::updateLabelGeometry()
+{
+    if (!m_warningWidget || !m_area)
+        return;
+
+    QPoint pos = positionForWarningSign();
+    m_warningWidget->setPosition(pos.x(), pos.y());
+}
+
+QPoint WarningSign::positionForWarningSign() const
+{
+    Q_ASSERT(m_area);
+
+    int x = m_area->width() - xpos_offset;
+    int y = m_area->height() - ypos_offset;
+
+    if (QAbstractScrollArea* scrollArea = dynamic_cast<QAbstractScrollArea*>(m_area)) {
+
+        if (QScrollBar* horizontal = scrollArea->horizontalScrollBar()) {
+            if (horizontal->isVisible())
+                y -= horizontal->height();
+        }
+
+        if (QScrollBar* vertical = scrollArea->verticalScrollBar()) {
+            if (vertical->isVisible())
+                x -= vertical->width();
+        }
+    }
+
+    return QPoint(x, y);
+}
+
+

GUI/coregui/Views/InfoWidgets/WarningSign.h

+// ************************************************************************** //
+//
+//  BornAgain: simulate and fit scattering at grazing incidence
+//
+//! @file      GUI/coregui/Views/InfoWidgets/WarningSign.h
+//! @brief     Defines class WarningSign
+//!
+//! @homepage  http://www.bornagainproject.org
+//! @license   GNU General Public License v3 or higher (see COPYING)
+//! @copyright Forschungszentrum Jülich GmbH 2016
+//! @authors   Scientific Computing Group at MLZ Garching
+//! @authors   Céline Durniak, Marina Ganeva, David Li, Gennady Pospelov
+//! @authors   Walter Van Herck, Joachim Wuttke
+//
+// ************************************************************************** //
+
+#ifndef WARNINGSIGN_H
+#define WARNINGSIGN_H
+
+#include "WinDllMacros.h"
+#include <QObject>
+
+class WarningSignWidget;
+class QWidget;
+
+//! The WarningSign controls appearance of WarningSignWidget on top of parent widget.
+
+class WarningSign : public QObject
+{
+public:
+    WarningSign(QWidget* parent);
+
+    void clear();
+
+    void setWarningHeader(const QString& warningHeader);
+
+    void setWarningMessage(const QString& warningMessage);
+
+    void setArea(QWidget *area);
+
+protected:
+    bool eventFilter(QObject *obj, QEvent *event);
+
+private:
+    void updateLabelGeometry();
+    QPoint positionForWarningSign() const;
+
+    QString m_warning_header;
+    QString m_warning_message;
+    WarningSignWidget* m_warningWidget;
+    QWidget *m_area;
+};
+
+#endif // WARNINGSIGN_H