src/model/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             FavouriteControl,
  18             AlarmControl
  19         };
  20
  21         class Control
  22         {
  23             public:
  24                 Control(ControlId aControlId, const QString &aImageName)
  25                     : mId(aControlId)
  26                     , mImage(new QImage(aImageName))
  27                     , mDrawPoint(QPoint(0,0))
  28                 { }
  29                 inline QImage *image() const { return mImage; }
  30                 inline void setDrawPoint(const QPoint &aPoint) { mDrawPoint = aPoint; }
  31                 inline QPoint drawPoint(const QRect &aRect) const // for painter to draw Control
  32                 {
  33                     return QPoint(aRect.x()+aRect.width(),aRect.y()) + mDrawPoint;
  34                 }
  35                 inline QRect drawRect(const QRect &aRect) const // helper for determining if Control was clicked
  36                 {
  37                     return QRect(drawPoint(aRect), drawPoint(aRect)+QPoint(mImage->size().width(),mImage->size().height()));
  38                 }
  39             private:
  40                 ControlId mId;
  41                 QImage *mImage;
  42                 QPoint mDrawPoint; // relative 'start-drawing' position (may hold negative values)
  43         };
  44
  45         Delegate(QTreeView *aParent); // the delegate 'owner' has to be specified in the constructor - it's used to obtain visualRect of selected item/index
  46         ~Delegate();
  47
  48         void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;
  49         QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const;
  50         //
  51         Delegate::ControlId whichControlClicked(const QModelIndex &aIndex, const QPoint &aPoint) const;
  52         bool isPointFromRect(const QPoint &aPoint, const QRect &aRect) const;
  53
  54     private:
  55         bool hasParent( const QModelIndex &index ) const;
  56         bool isLast( const QModelIndex &index ) const;
  57         bool isExpanded( const QModelIndex &index ) const;
  58         void defineControls();
  59
  60     private:
  61         QPointer<QTreeView> mViewPtr;
  62         QMap<ControlId,Control*> mControls;
  63 };
  64
  65 #endif /* DELEGATE_H */
  66