refs #452 overlay messages (allows to display overlay messages in a widget)

* the overlay widget itself
* a QFrame derived class allowing to display such widgets as overlay

src/blackgui/overlaymessagesframe.cpp

@@ -0,0 +1,95 @@
+/* Copyright (C) 2015
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+#include "blackgui/overlaymessagesframe.h"
+#include "blackgui/stylesheetutility.h"
+#include <QPainter>
+#include <QKeyEvent>
+
+namespace BlackGui
+{
+    COverlayMessagesFrame::COverlayMessagesFrame(QWidget *parent) :
+        QFrame(parent)
+    { }
+
+    COverlayMessagesFrame::~COverlayMessagesFrame()
+    {}
+
+    void COverlayMessagesFrame::showStatusMessagesFrame()
+    {
+        this->initInnerFrame();
+    }
+
+    void COverlayMessagesFrame::hideStatusMessagesFrame()
+    {
+        if (!m_statusMessages) { return; }
+    }
+
+    void COverlayMessagesFrame::showMessages(const BlackMisc::CStatusMessageList &messages)
+    {
+        if (messages.isEmpty()) { return; }
+        this->initInnerFrame();
+        this->m_statusMessages->showMessages(messages);
+        this->repaint();
+    }
+
+    void COverlayMessagesFrame::showMessage(const BlackMisc::CStatusMessage &message)
+    {
+        if (message.isEmpty()) { return; }
+        this->initInnerFrame();
+        this->m_statusMessages->showMessage(message);
+        this->repaint();
+    }
+
+    void COverlayMessagesFrame::paintEvent(QPaintEvent *event)
+    {
+        bool s = CStyleSheetUtility::useStyleSheetInDerivedWidget(this, QStyle::PE_Widget);
+        if (s) { return; }
+        QFrame::paintEvent(event);
+    }
+
+    void COverlayMessagesFrame::keyPressEvent(QKeyEvent *event)
+    {
+        if (!m_statusMessages) { QFrame::keyPressEvent(event); }
+        if (event->key() == Qt::Key_Escape)
+        {
+            m_statusMessages->close();
+            event->setAccepted(true);
+        }
+        else
+        {
+            QFrame::keyPressEvent(event);
+        }
+    }
+
+    QSize COverlayMessagesFrame::innerFrameSize() const
+    {
+        int w = this->width();
+        int h = this->height();
+        int wInner = 0.7 * w;
+        int hInner = 0.7 * h;
+        return QSize(wInner, hInner);
+    }
+
+    void COverlayMessagesFrame::initInnerFrame()
+    {
+        QSize inner(innerFrameSize());
+        if (!this->m_statusMessages)
+        {
+            this->m_statusMessages = new COverlayMessages(inner.width(), inner.height(), this);
+        }
+
+        QPoint middle = this->geometry().center();
+        int w = inner.width();
+        int h = inner.height();
+        int x = middle.x() - w / 2;
+        int y = middle.y() - h / 2;
+        this->m_statusMessages->setGeometry(x, y, w, h);
+    }
+} // ns