Shift TimelineView’s items half a day

They are supposed to show how many _nigths_ guests are staying in
lodgins, thus they arrive at afternoon and leave at morning; the shift
puts the starting position at midday.

src/ReservationsTimeline.qml

@@ -213,7 +213,9 @@ Control {
 
                 Repeater {
                     delegate: Rectangle {
-                        color: "transparent"
+                        required property bool isWeekend
+
+                        color: isWeekend ? palette.alternateBase : "transparent"
                         height: parent.height
                         width: control.dayWidth
 

src/TimelineDayRow.qml

@@ -14,7 +14,10 @@ Control {
             model: model
 
             delegate: Label {
+                id: delegate
+
                 required property string display
+                required property bool isWeekend
 
                 anchors.bottom: parent.bottom
                 anchors.top: parent.top
@@ -24,6 +27,10 @@ Control {
                 verticalAlignment: Text.AlignVCenter
                 width: control.dayWidth
 
+                background: Rectangle {
+                    color: delegate.isWeekend ? delegate.palette.alternateBase : "transparent"
+                }
+
                 Separator {
                     anchors.bottom: parent.bottom
                     anchors.right: parent.right

src/timelinedaymodel.cpp

@@ -25,11 +25,20 @@ QVariant TimelineDayModel::data(const QModelIndex &index, int role) const
     switch (role) {
     case Qt::DisplayRole:
         return QString::number(date.day());
+    case WeekendRole:
+        return date.dayOfWeek() > 5;
     }
 
     return {};
 }
 
+QHash<int, QByteArray> TimelineDayModel::roleNames() const
+{
+    QHash<int, QByteArray> roles = QAbstractListModel::roleNames();
+    roles[WeekendRole] = "isWeekend";
+    return roles;
+}
+
 QDate TimelineDayModel::fromDate() const
 {
     return m_fromDate;

src/timelinedaymodel.h

@@ -13,10 +13,15 @@ class TimelineDayModel : public QAbstractListModel
     Q_PROPERTY(QDate toDate READ toDate WRITE setToDate NOTIFY toDateChanged)
 
 public:
+    enum Role {
+        WeekendRole = Qt::UserRole,
+    };
+
     explicit TimelineDayModel(QObject *parent = nullptr);
 
     int rowCount(const QModelIndex &parent = QModelIndex()) const override;
     QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
+    QHash<int, QByteArray> roleNames() const override;
 
     QDate fromDate() const;
     void setFromDate(QDate date);

src/timelineview.cpp

@@ -9,7 +9,7 @@ struct TimelineView::Item
         , day(day)
     {
         item->setParentItem(&view);
-        item->setPosition(QPointF(day * view.dayWidth(), 0.0));
+        item->setPosition(QPointF(day * view.dayWidth() + view.dayWidth() / 2, 0.0));
         item->setSize(QSizeF(len * view.dayWidth(), view.height()));
         item->setVisible(true);
     }