TQObject


class description - source file - inheritance tree

class TQObject

    private:
protected:
static Bool_t ConnectToClass(TQObject* sender, const char* signal, TClass* receiver_class, void* receiver, const char* slot) static Bool_t ConnectToClass(const char* sender_class, const char* signal, TClass* receiver_class, void* receiver, const char* slot) TList* GetListOfClassSignals() const TList* GetListOfConnections() const TList* GetListOfSignals() const virtual void* GetSender() public:
TQObject TQObject() TQObject TQObject(TQObject&) virtual void ~TQObject() virtual void ChangedBy(const char* method) static TClass* Class() Bool_t Connect(const char* signal, const char* receiver_class, void* receiver, const char* slot) static Bool_t Connect(TQObject* sender, const char* signal, const char* receiver_class, void* receiver, const char* slot) static Bool_t Connect(const char* sender_class, const char* signal, const char* receiver_class, void* receiver, const char* slot) virtual void Connected(const char*) virtual void Destroyed() Bool_t Disconnect(const char* signal = 0, void* receiver = 0, const char* slot = 0) static Bool_t Disconnect(TQObject* sender, const char* signal = 0, void* receiver = 0, const char* slot = 0) static Bool_t Disconnect(const char* class_name, const char* signal, void* receiver = 0, const char* slot = 0) virtual void Disconnected(const char*) void Emit(const char* signal) void Emit(const char* signal, Double_t param) void Emit(const char* signal, Long_t param) void Emit(const char* signal, const char* params) void Emit(const char* signal, Long_t* paramArr) void Emit(const char* signal, Char_t param) void Emit(const char* signal, UChar_t param) void Emit(const char* signal, Short_t param) void Emit(const char* signal, UShort_t param) void Emit(const char* signal, Int_t param) void Emit(const char* signal, UInt_t param) void Emit(const char* signal, ULong_t param) void Emit(const char* signal, Float_t param) virtual Bool_t HasConnection(const char* signal_name) const virtual void HighPriority(const char* signal_name, const char* slot_name = 0) virtual TClass* IsA() const static void LoadRQ_OBJECT() virtual void LowPriority(const char* signal_name, const char* slot_name = 0) virtual void Message(const char* msg) virtual Int_t NumberOfConnections() const virtual Int_t NumberOfSignals() const virtual void ShowMembers(TMemberInspector& insp, char* parent) virtual void Streamer(TBuffer& b) void StreamerNVirtual(TBuffer& b)

Data Members

    private:
protected:
TList* fListOfSignals ! list of signals from this object TList* fListOfConnections ! list of connections to this object public:


See also

TGFrame, TQClass, TQConnection, TQObjSender, TSysEvtHandler, TVirtualPad

Class Description

                                                                      
 This is the ROOT implementation of the Qt object communication       
 mechanism (see also http://www.troll.no/qt/metaobjects.html)         
                                                                      
 Signals and slots are used for communication between objects.        
 When an object has changed in some way that might be interesting     
 for the outside world, it emits a signal to tell whoever is          
 listening. All slots that are connected to this signal will be       
 activated (called). It is even possible to connect a signal          
 directly to another signal (this will emit the second signal         
 immediately whenever the first is emitted.) There is no limitation   
 on the number of slots that can be connected to a signal.            
 The slots will be activated in the order they were connected         
 to the signal. This mechanism allows objects to be easily reused,    
 because the object that emits a signal does not need to know         
 to which objects the signals are connected.                          
 Together, signals and slots make up a powerfull component            
 programming mechanism.                                               
                                                                      
 This implementation is provided by                                   
 Valeriy Onuchin (onuchin@sirius.ihep.su).                            
                                                                      


TQObject()
 TQObject Constructor.
 Comment:
  - In order to minimize memory allocation fListOfSignals and
    fListOfConnections are allocated only if it is neccesary
  - When fListOfSignals/fListOfConnections are empty they will
    be deleted

~TQObject()
 TQObject Destructor.
    - delete all connections and signal list

TList* GetListOfClassSignals() const
 Returns pointer to list of signals of this class.

void HighPriority(const char *signal_name, const char *slot_name)
 1. If slot_name = 0 => makes signal defined by the signal_name
    to be the first in the fListOfSignals, this decreases
    the time for lookup.
 2. If slot_name != 0 => makes slot defined by the slot_name
    to be executed first when signal_name is emitted.

void LowPriority(const char *signal_name, const char *slot_name)
 1. If slot_name = 0 => makes signal defined by the signal_name
    to be the last in the fListOfSignals, this increase the time
    for lookup.
 2. If slot_name != 0 => makes slot defined by the slot_name
    to  be executed last when signal_name is emitted.

Bool_t HasConnection(const char *signal_name) const
 Return true if there is any object connected to this signal.
 Only checks for object signals.

Int_t NumberOfSignals() const
 Return number of signals for this object.

Int_t NumberOfConnections() const
 Return number of connections for this object.

void Emit(const char *signal_name)
 Acitvate signal without args
 Example:
          theButton->Emit("Clicked()");

void Emit(const char *signal_name, Long_t param)
 Activate signal with single parameter
 Example:
          theButton->Emit("Clicked(int)",id)

void Emit(const char *signal_name, Double_t param)
 Activate signal with single parameter.

void Emit(const char *signal_name, const char *params)
 Activate signal with parameter text string.
 Example:
          myObject->Emit("Error(char*)","Fatal error");

void Emit(const char *signal_name, Long_t *paramArr)
 Emit a signal with a varying number of arguments,
 paramArr is an array of the parameters.
 Note: any parameter should be converted to long type.
 Example:
    TQObject *processor; // data processor
    TH1F     *hist;      // filled with processor results

    processor->Connect("Evaluated(Float_t,Float_t)",
                       "TH1F",hist,"Fill12(Axis_t x, Axis_t)");

    Long_t args[2];
    args[0] = (Long_t)processor->GetValue(1);
    args[1] = (Long_t)processor->GetValue(2);

    processor->Emit("Evaluated(Float_t,Float_t)",args);

Bool_t ConnectToClass(TQObject *sender, const char *signal, TClass *cl, void *receiver, const char *slot)
 Create connection between sender and receiver.
 Receiver class needs to have a dictionary.

Bool_t ConnectToClass(const char *class_name, const char *signal, TClass *cl, void *receiver, const char *slot)
 This method allows to make connection from any object
 of the same class to the receiver object.
 Receiver class needs to have a dictionary.

Bool_t Connect(TQObject *sender, const char *signal, const char *cl, void *receiver, const char *slot)
 Create connection between sender and receiver.
 Signal and slot string must have a form:
    "Draw(char*, Option_t* ,Int_t)"
 All blanks and "const" words will be removed,

 cl != 0 - class name, it can be class with or
           without dictionary, e.g interpreted class.
 Example:
       TGButton *myButton;
       TH2F     *myHist;

       TQObject::Connect(myButton,"Clicked()",
                         "TH2F", myHist,"Draw(Option_t*)");

 cl == 0 - corresponds to function (interpereted or global)
           the name of the function is defined by the slot string,
           parameter receiver should be 0.
 Example:
       TGButton *myButton;
       TH2F     *myHist;

       TQObject::Connect(myButton,"Clicked()",
                         0, 0,"hsimple()");

 Warning:
  If receiver is class not derived from TQObject and going to be
  deleted, disconnect all connections to this receiver.
  In case of class derived from TQObject it is done automatically.

Bool_t Connect(const char *class_name, const char *signal, const char *cl, void *receiver, const char *slot)
 This method allows to make a connection from any object
 of the same class to a single slot.
 Signal and slot string must have a form:
    "Draw(char*, Option_t* ,Int_t)"
 All blanks and "const" words will be removed,

 cl != 0 - class name, it can be class with or
           without dictionary, e.g interpreted class.
 Example:
       TGButton *myButton;
       TH2F     *myHist;

       TQObject::Connect("TGButton", "Clicked()",
                         "TH2F", myHist, "Draw(Option_t*)");

 cl == 0 - corresponds to function (interpereted or global)
           the name of the function is defined by the slot string,
           parameter receiver should be 0.
 Example:
       TGButton *myButton;
       TH2F     *myHist;

       TQObject::Connect("TGButton", "Clicked()",
                         0, 0, "hsimple()");

 Warning:
  If receiver class not derived from TQObject and going to be
  deleted, disconnect all connections to this receiver.
  In case of class derived from TQObject it is done automatically.

Bool_t Connect(const char *signal, const char *receiver_class, void *receiver, const char *slot)
 Non-static method is used to connect from the signal
 of this object to the receiver slot.

 Warning! No check on consistency of sender/receiver
 classes/methods.

 This method makes possible to have connection/signals from
 interpreted class. See also RQ_OBJECT.h.

Bool_t Disconnect(TQObject *sender, const char *signal, void *receiver, const char *slot)
 Disconnects signal in object sender from slot_method in
 object receiver. For objects derived from TQObject signal-slot
 connection is removed when either of the objects involved
 are destroyed.

 Disconnect() is typically used in three ways, as the following
 examples shows:

  - Disconnect everything connected to an object's signals:
       Disconnect(myObject);
  - Disconnect everything connected to a signal:
       Disconnect(myObject, "mySignal()");
  - Disconnect a specific receiver:
       Disconnect(myObject, 0, myReceiver, 0);

 0 may be used as a wildcard in three of the four arguments,
 meaning "any signal", "any receiving object" or
 "any slot in the receiving object", respectively.

 The sender has no default and may never be 0
 (you cannot disconnect signals from more than one object).

 If signal is 0, it disconnects receiver and slot_method
 from any signal. If not, only the specified signal is
 disconnected.

 If  receiver is 0, it disconnects anything connected to signal.
 If not, slots in objects other than receiver are not
 disconnected

 If slot_method is 0, it disconnects anything that is connected
 to receiver.  If not, only slots named slot_method will be
 disconnected, and all other slots are left alone.
 The slot_method must be 0 if receiver is left out, so you
 cannot disconnect a specifically-named slot on all objects.

Bool_t Disconnect(const char *class_name, const char *signal, void *receiver, const char *slot)
 Disconnects "class signal". The class is defined by class_name.
 See also Connect(class_name,signal,receiver,slot).

Bool_t Disconnect(const char *signal, void *receiver, const char *slot)
 Disconnects signal of this object from slot of receiver.
 Equivalent to Disconnect(this, signal, receiver, slot)

void Streamer(TBuffer &R__b)
 Stream an object of class TQObject.

void LoadRQ_OBJECT()
 Load RQ_OBJECT.h which contains the #define RQ_OBJECT needed to
 let interpreted classes connect to signals of compiled classes.



Inline Functions


             TList* GetListOfSignals() const
             TList* GetListOfConnections() const
              void* GetSender()
               void Emit(const char* signal, Char_t param)
               void Emit(const char* signal, UChar_t param)
               void Emit(const char* signal, Short_t param)
               void Emit(const char* signal, UShort_t param)
               void Emit(const char* signal, Int_t param)
               void Emit(const char* signal, UInt_t param)
               void Emit(const char* signal, ULong_t param)
               void Emit(const char* signal, Float_t param)
               void Connected(const char*)
               void Disconnected(const char*)
               void Destroyed()
               void ChangedBy(const char* method)
               void Message(const char* msg)
            TClass* Class()
            TClass* IsA() const
               void ShowMembers(TMemberInspector& insp, char* parent)
               void StreamerNVirtual(TBuffer& b)
           TQObject TQObject(TQObject&)


Author: Valeriy Onuchin & Fons Rademakers 15/10/2000
Last update: root/base:$Name: $:$Id: TQObject.cxx,v 1.11 2001/05/15 10:10:33 rdm Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *


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