Added support for showing the Stars on the DiveTable

For the stars on the dive table I had to rework a bit my
StarRating widget, because it used a pixmap for each widget
that were created. Not it uses only 2 pixmaps: the active
and inactive ones.

A new file was created named modeldelegates(h, cpp) that
should hold all delegates of the models. For the GTK / C
folks, a 'Delegate' ia s way to bypass the default behavior
of the view that's displaying the data.

I also added the code to display the stars if no delegate
is set ( good for debugging. )

Signed-off-by: Tomaz Canabrava <tcanabrava@kde.org>

qt-ui/modeldelegates.cpp

@@ -0,0 +1,36 @@
+#include "modeldelegates.h"
+#include "../dive.h"
+#include "../divelist.h"
+#include "starwidget.h"
+#include "models.h"
+
+#include <QtDebug>
+#include <QPainter>
+
+void StarWidgetsDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const
+{
+	if (!index.isValid()){
+		return;
+	}
+
+	int rating = index.model()->data(index, DiveTripModel::DelegatesRole).toInt();
+
+	if (option.state & QStyle::State_Selected)
+         painter->fillRect(option.rect, option.palette.highlight());
+
+	painter->save();
+	painter->setRenderHint(QPainter::Antialiasing, true);
+
+	for(int i = 0; i < rating; i++)
+		painter->drawPixmap(option.rect.x() + i * IMG_SIZE + SPACING, option.rect.y(), StarWidget::starActive());
+
+	for(int i = rating; i < TOTALSTARS; i++)
+		painter->drawPixmap(option.rect.x() + i * IMG_SIZE + SPACING, option.rect.y(), StarWidget::starInactive());
+
+	painter->restore();
+}
+
+QSize StarWidgetsDelegate::sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) const
+{
+	return QSize(IMG_SIZE * TOTALSTARS + SPACING * (TOTALSTARS-1), IMG_SIZE);
+}