Add a sample download dialog and upload sub-system

Samples are  downloaded from a  web server, currently the  SF download
server.   The samples  are  stored in  the  source controlled  samples
directory and the CMake script  there builds a suitable directory tree
for upload to the web  server under samples/web containing the samples
hierarchy and the  generated JSON contents database  file. The samples
CMake script also  defines an 'upload-samples' target  that uses rsync
to efficiently upload  the samples and the  accompanying contents JSON
database file.

Any directory structure under the samples directory may be created, to
add a new sample file simply add  the file to source control and amend
the list of sample files (SAMPLE_FILES) in samples/CMakeLists.txt.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6308 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

SampleDownloader/DirectoryDelegate.cpp

@@ -0,0 +1,44 @@
+#include "DirectoryDelegate.hpp"
+
+#include <QApplication>
+#include <QVariant>
+#include <QString>
+#include <QStyle>
+#include <QModelIndex>
+#include <QPainter>
+#include <QStyleOptionViewItem>
+#include <QStyleOptionProgressBar>
+
+void DirectoryDelegate::paint (QPainter * painter, QStyleOptionViewItem const& option
+                               , QModelIndex const& index) const
+{
+  if (1 == index.column ())
+    {
+      QStyleOptionProgressBar progress_bar_option;
+      progress_bar_option.rect = option.rect;
+      progress_bar_option.state = QStyle::State_Enabled;
+      progress_bar_option.direction = QApplication::layoutDirection ();
+      progress_bar_option.fontMetrics = QApplication::fontMetrics ();
+      progress_bar_option.minimum = 0;
+      progress_bar_option.maximum = 100;
+      auto progress = index.data ().toLongLong ();
+      if (progress > 0)
+        {
+          auto percent = int (progress * 100 / index.data (Qt::UserRole).toLongLong ());
+          progress_bar_option.progress = percent;
+          progress_bar_option.text = QString::number (percent) + '%';
+          progress_bar_option.textVisible = true;
+          progress_bar_option.textAlignment = Qt::AlignCenter;
+        }
+      else
+        {
+          // not started
+          progress_bar_option.progress = -1;
+        }
+      QApplication::style ()->drawControl (QStyle::CE_ProgressBar, &progress_bar_option, painter);
+    }
+  else
+    {
+      QStyledItemDelegate::paint (painter, option, index);
+    }
+}