TGWidget.h

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// @(#)root/gui:$Id$
// Author: Fons Rademakers   05/01/98
 
/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#ifndef ROOT_TGWidget
#define ROOT_TGWidget
 
 
//////////////////////////////////////////////////////////////////////////
//                                                                      //
// TGWidget                                                             //
//                                                                      //
// The widget base class. It is light weight (all inline service        //
// methods) and is typically used as mixin class (via multiple          //
// inheritance), see for example TGButton.                              //
//                                                                      //
//////////////////////////////////////////////////////////////////////////
 
#include "GuiTypes.h"
#include "WidgetMessageTypes.h"
#include "TString.h"
 
//--- Text justification modes
 
enum ETextJustification {
   kTextLeft    = BIT(0),
   kTextRight   = BIT(1),
   kTextCenterX = BIT(2),
   kTextTop     = BIT(3),
   kTextBottom  = BIT(4),
   kTextCenterY = BIT(5)
};
 
 
//--- Widget status
 
enum EWidgetStatus {
   kWidgetWantFocus = BIT(0),
   kWidgetHasFocus  = BIT(1),
   kWidgetIsEnabled = BIT(2)
};
 
 
class TGWindow;
 
class TGWidget {
 
protected:
   Int_t            fWidgetId;     // the widget id (used for event processing)
   Int_t            fWidgetFlags;  // widget status flags (OR of EWidgetStatus)
   const TGWindow  *fMsgWindow;    // window which handles widget events
   TString          fCommand;      // command to be executed
 
   TGWidget(const TGWidget& tgw):
     fWidgetId(tgw.fWidgetId), fWidgetFlags(tgw.fWidgetFlags),
     fMsgWindow(tgw.fMsgWindow), fCommand(tgw.fCommand) { }
   TGWidget& operator=(const TGWidget& tgw) {
     if(this!=&tgw) {
       fWidgetId=tgw.fWidgetId; fWidgetFlags=tgw.fWidgetFlags;
       fMsgWindow=tgw.fMsgWindow; fCommand=tgw.fCommand; } return *this; }
   Int_t SetFlags(Int_t flags) { return fWidgetFlags |= flags; }
   Int_t ClearFlags(Int_t flags) { return fWidgetFlags &= ~flags; }
 
public:
   TGWidget():
     fWidgetId(-1), fWidgetFlags(0), fMsgWindow(0), fCommand() { }
   TGWidget(Int_t id):
     fWidgetId(id), fWidgetFlags(0), fMsgWindow(0), fCommand() { }
   virtual ~TGWidget() { }
 
   Int_t         WidgetId() const { return fWidgetId; }
   Bool_t        IsEnabled() const { return (Bool_t)((fWidgetFlags & kWidgetIsEnabled) != 0); }
   Bool_t        HasFocus() const { return (Bool_t)((fWidgetFlags & kWidgetHasFocus) != 0); }
   Bool_t        WantFocus() const { return (Bool_t)((fWidgetFlags & kWidgetWantFocus) != 0); }
   virtual void  Associate(const TGWindow *w) { fMsgWindow = w; }
   virtual void  SetCommand(const char *command) { fCommand = command; }
   const char   *GetCommand() const { return fCommand.Data(); }
 
   ClassDef(TGWidget,0)  // Widget base class
};
 
#endif