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             WarningControlOn,
  23             WarningControlOff
  24         };
  25
  26         class Control
  27         {
  28             public:
  29                 Control(ControlId aControlId, const QString &aImageName)
  30                     : mId(aControlId)
  31                     , mImage(new QImage(aImageName))
  32                     , mDrawPoint(QPoint(0,0))
  33                 { }
  34                 inline QImage *image() const { return mImage; }
  35                 inline void setDrawPoint(const QPoint &aPoint) { mDrawPoint = aPoint; }
  36                 inline QPoint drawPoint(const QRect &aRect = QRect()) const // for painter to draw Control
  37                 {
  38                     if(aRect == QRect()) // null rectangle
  39                         return mDrawPoint; // returns relative drawing point
  40                     else
  41                         return QPoint(aRect.x()+aRect.width(),aRect.y()) + mDrawPoint; // returns absolute drawing point
  42                 }
  43                 inline QRect drawRect(const QRect &aRect) const // helper for determining if Control was clicked
  44                 {
  45                     return QRect(drawPoint(aRect), drawPoint(aRect)+QPoint(mImage->size().width(),mImage->size().height()));
  46                 }
  47                 bool hasConflict;
  48             private:
  49                 ControlId mId;
  50                 QImage *mImage;
  51                 QPoint mDrawPoint; // relative 'start-drawing' position (may hold negative values)
  52         };
  53
  54         Delegate(QTreeView *aParent); // the delegate 'owner' has to be specified in the constructor - it's used to obtain visualRect of selected item/index
  55         ~Delegate();
  56
  57         void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;
  58         QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const;
  59         //
  60         Delegate::ControlId whichControlClicked(const QModelIndex &aIndex, const QPoint &aPoint) const;
  61         bool isPointFromRect(const QPoint &aPoint, const QRect &aRect) const;
  62
  63     private:
  64         bool hasParent( const QModelIndex &index ) const;
  65         bool isLast( const QModelIndex &index ) const;
  66         bool isExpanded( const QModelIndex &index ) const;
  67         void defineControls();
  68         // TODO: the better place for these methods would be 'eventmodel'
  69         // they are used in 'paint' method and so it's better to obtain number of
  70         // favourities/alarms once when the data has changed and not to call
  71         // these methods which iterate over all Events in corresponding group
  72         // every time it requires them
  73         int numberOfFavourities(const QModelIndex &index) const;
  74         int numberOfAlarms(const QModelIndex &index) const;
  75         bool hasTimeConflict(const QModelIndex &index, const QModelIndex &parent) const;
  76
  77     private:
  78         QPointer<QTreeView> mViewPtr;
  79         QMap<ControlId,Control*> mControls;
  80 };
  81
  82 #endif /* DELEGATE_H */
  83