Add what's new dialog

custom_widgets/rounded_corners_dialog.cpp

@@ -0,0 +1,39 @@
+#include "rounded_corners_dialog.h"
+
+#include <QtWidgets>
+
+YACReader::RoundedCornersDialog::RoundedCornersDialog(QWidget *parent)
+    : QDialog(parent)
+{
+    setWindowFlags(windowFlags() | Qt::FramelessWindowHint | Qt::WindowSystemMenuHint);
+    setAttribute(Qt::WA_TranslucentBackground);
+}
+
+void YACReader::RoundedCornersDialog::paintEvent(QPaintEvent *)
+{
+    qreal radius = 36.0; // desired radius in absolute pixels
+    qreal borderWidth = 0.0;
+
+    if (!(windowFlags() & Qt::FramelessWindowHint) && !testAttribute(Qt::WA_TranslucentBackground))
+        return; // nothing to do
+
+    QPainter p(this);
+    p.setRenderHint(QPainter::Antialiasing);
+
+    // Paint thyself.
+    QRectF rect(QPointF(0, 0), size());
+    // Check for a border size.
+    qreal penWidth = borderWidth;
+    p.setPen(Qt::NoPen);
+
+    // Set the brush from palette role.
+    p.setBrush(palette().brush(backgroundRole()));
+    // Got radius?  Otherwise draw a quicker rect.
+    if (radius > 0.0)
+        p.drawRoundedRect(rect, radius, radius, Qt::AbsoluteSize);
+    else
+        p.drawRect(rect);
+
+    // C'est finí
+    p.end();
+}