TQtWidget

Class Description


  TQtWidget is a QWidget with the QPixmap double buffer
  It is designed to back the ROOT TCanvasImp class interface  and it can be used
  as a regular Qt Widget to create Qt-based GUI with the embedded TCanvas objects

           This widget can be used as a Qt "custom widget"
         to build a custom GUI interfaces with  Qt Designer

 The class emits the Qt signals and has Qt public slots

  Public slots:  (Qt)

   virtual void cd();  // make the associated TCanvas the current one (shortcut to TCanvas::cd())
   virtual void cd(int subpadnumber); // as above - shortcut to Canvas::cd(int subpadnumber)
   void Disconnect(); // disconnect the QWidget from the ROOT TCanvas (used in the class dtor)
   void Refresh();    // force the associated TCanvas::Update to be called
   virtual bool Save(const QString &fileName) const;  // Save the widget image with some ppixmap file
   virtual bool Save(const char    *fileName) const;
   virtual bool Save(const QString &fileName,const char *format,int quality=60) const;
   virtual bool Save(const char    *fileName,const char *format,int quality=60) const;

  signals        (Qt)

    CanvasPainted();  // Signal the TCanvas has been painted onto the screen
    Saved(bool ok);   // Signal the TCanvas has been saved into the file
    RootEventProcessed(TObject *selected, unsigned int event, TCanvas *c);
                      // Signal the Qt mouse/keyboard event has been process by ROOT
                      // This "signal" is emitted by the enabled mouse events only.
                      // See: EnableSignalEvents
                      // ---  DisableSignalEvents

  public methods:
    The methods below define whether the TQtWidget object emits "RootEventProcessed" Qt signals
     (By default no  RootEventProcessed Qt signal is emitted )
     void EnableSignalEvents (UInt_t f)
     void DisableSignalEvents(UInt_t f),
         where f is a bitwise OR of the mouse event flags:
                  kMousePressEvent       // TCanvas processed QEvent mousePressEvent
                  kMouseMoveEvent        // TCanvas processed QEvent mouseMoveEvent
                  kMouseReleaseEvent     // TCanvas processed QEvent mouseReleaseEvent
                  kMouseDoubleClickEvent // TCanvas processed QEvent mouseDoubleClickEvent
                  kKeyPressEvent         // TCanvas processed QEvent keyPressEvent
                  kEnterEvent            // TCanvas processed QEvent enterEvent
                  kLeaveEvent            // TCanvas processed QEvent leaveEvent

  For example to create the custom responce to the mouse crossing TCanvas
  connect the RootEventProsecced signal with your qt slot:

 connect(tQtWidget,SIGNAL(RootEventProcessed(TObject *, unsigned int, TCanvas *))
          ,this,SLOT(CanvasEvent(TObject *, unsigned int, TCanvas *)));
  . . .

void qtrootexample1::CanvasEvent(TObject *obj, unsigned int event, TCanvas *)
{
  TQtWidget *tipped = (TQtWidget *)sender();
  const char *objectInfo =
        obj->GetObjectInfo(tipped->GetEventX(),tipped->GetEventY());
  QString tipText ="You have ";
  if  (tipped == tQtWidget1)
     tipText +="clicked";
  else
     tipText +="passed";
  tipText += " the object <";
  tipText += obj->GetName();
  tipText += "> of class ";
  tipText += obj->ClassName();
  tipText += " : ";
  tipText += objectInfo;

   QWhatsThis::display(tipText)
 }
TQtWidget

class TQtWidget : public QWidget

Data Members

Class Description
