src/mvc/delegate.h

   1 #ifndef DELEGATE_H
   2 #define DELEGATE_H
   3
   4 #include <QItemDelegate>
   5 #include <QTreeView>
   6 #include <QPointer>
   7
   8 class Delegate : public QItemDelegate
   9 {
  10     Q_OBJECT
  11
  12     public:
  13
  14         enum ControlId
  15         {
  16             ControlNone = 0,
  17             FavouriteControlOn,
  18             FavouriteControlOff,
  19             AlarmControlOn,
  20             AlarmControlOff,
  21             MapControl,
  22             WarningControl
  23         };
  24
  25         class Control
  26         {
  27             public:
  28                 Control(ControlId aControlId, const QString &aImageName)
  29                     : mId(aControlId)
  30                     , mImage(new QImage(aImageName))
  31                     , mDrawPoint(QPoint(0,0))
  32                 { }
  33                 inline QImage *image() const { return mImage; }
  34                 inline void setDrawPoint(const QPoint &aPoint) { mDrawPoint = aPoint; }
  35                 inline QPoint drawPoint(const QRect &aRect = QRect()) const // for painter to draw Control
  36                 {
  37                     if(aRect == QRect()) // null rectangle
  38                         return mDrawPoint; // returns relative drawing point
  39                     else
  40                         return QPoint(aRect.x()+aRect.width(),aRect.y()) + mDrawPoint; // returns absolute drawing point
  41                 }
  42                 inline QRect drawRect(const QRect &aRect) const // helper for determining if Control was clicked
  43                 {
  44                     return QRect(drawPoint(aRect), drawPoint(aRect)+QPoint(mImage->size().width(),mImage->size().height()));
  45                 }
  46                 bool hasConflict;
  47             private:
  48                 ControlId mId;
  49                 QImage *mImage;
  50                 QPoint mDrawPoint; // relative 'start-drawing' position (may hold negative values)
  51         };
  52
  53         Delegate(QTreeView *aParent); // the delegate 'owner' has to be specified in the constructor - it's used to obtain visualRect of selected item/index
  54         ~Delegate();
  55
  56         void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;
  57         QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const;
  58         //
  59         Delegate::ControlId whichControlClicked(const QModelIndex &aIndex, const QPoint &aPoint) const;
  60         bool isPointFromRect(const QPoint &aPoint, const QRect &aRect) const;
  61
  62     private:
  63         bool hasParent( const QModelIndex &index ) const;
  64         bool isLast( const QModelIndex &index ) const;
  65         bool isExpanded( const QModelIndex &index ) const;
  66         void defineControls();
  67         // TODO: the better place for these methods would be 'eventmodel'
  68         // they are used in 'paint' method and so it's better to obtain number of
  69         // favourities/alarms once when the data has changed and not to call
  70         // these methods which iterate over all Events in corresponding group
  71         // every time it requires them
  72         int numberOfFavourities(const QModelIndex &index) const;
  73         int numberOfAlarms(const QModelIndex &index) const;
  74         bool hasTimeConflict(const QModelIndex &index, const QModelIndex &parent) const;
  75
  76     private:
  77         QPointer<QTreeView> mViewPtr;
  78         QMap<ControlId,Control*> mControls;
  79 };
  80
  81 #endif /* DELEGATE_H */
  82