// @(#)root/gui:$Id: TGuiBuilder.cxx 23115 2008-04-10 13:35:37Z rdm $
// Author: Valeriy Onuchin   12/08/04

/*************************************************************************
 * Copyright (C) 1995-2004, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

//////////////////////////////////////////////////////////////////////////
//
// TGuiBuilder
//
//
//  ************************************************
//                ROOT GUI Builder principles
//  ************************************************
//
//  With the GUI builder, we try to make the next step from WYSIWYG
//  to embedded editing concept - WYSIWYE ("what you see is what you edit").
//  The ROOT GUI Builder allows modifying real GUI objects.
//  For example, one can edit the existing GUI application created by
//  $ROOTSYS/tutorials/gui/guitest.C.
//  GUI components can be added to a design area from a widget palette,
//  or can be borrowed from another application.
//  One can drag and and drop TCanvas's menu bar into the application.
//  GUI objects can be resized and dragged, copied and pasted.
//  ROOT GUI Builder allows changing the layout, snap to grid, change object's
//  layout order via the GUI Builder toolbar, or by options in the right-click
//  context menus.
//  A final design can be immediatly tested and used, or saved as a C++ macro.
//  For example, it's possible to rearrange buttons in control bar,
//  add separators etc. and continue to use a new fancy control bar in the
//  application.
//
//  ************************************************
//
//  The following is a short description of the GUI Builder actions and key shortcuts:
//
//   o Press Ctrl-Double-Click to start/stop edit mode
//   o Press Double-Click to activate quick edit action (defined in root.mimes)
//
//                 Selection, grabbing, dropping
//       ************************************************
//    It is possible to select, drag any frame and drop it to any frame
//
//   o Click left mouse button or Ctrl-Click to select an object to edit.
//   o Press right mouse button to activate context menu
//   o Mutiple selection (grabbing):
//      - draw lasso and press Return key
//      - press Shift key and draw lasso
//   o Dropping:
//      - select frame and press Ctrl-Return key
//   o Changing layout order:
//      - select frame and use arrow keys to change layout order
//   o Alignment:
//      - draw lasso and press arrow keys (or Shift-Arrow key) to align frames
//
//                    Key shortcuts
//       ************************************************
//   o Return      - grab selected frames
//   o Ctrl-Return - drop frames
//   o Del         - delete selected frame
//   o Shift-Del   - crop action
//   o Ctrl-X      - cut action
//   o Ctrl-C      - copy action
//   o Ctrl-V      - paste action
//   o Ctrl-R      - replace action
//   o Ctrl-L      - compact layout
//   o Ctrl-B      - break layout
//   o Ctrl-H      - switch horizontal-vertical layout
//   o Ctrl-G      - switch on/off grid
//   o Ctrl-S      - save action
//   o Ctrl-O      - open and execute a ROOT macro file. GUI components created
//                   after macro execution will be emebedded to currently edited
//                   design area.
//   o Ctrl-N      - create new main frame
//
//Begin_Html
/*
<img src="gif/RootGuiBuilder.gif">
*/
//End_Html


#include "TGuiBuilder.h"
#include "TVirtualDragManager.h"
#include "TPluginManager.h"
#include "TROOT.h"
#include "TApplication.h"

ClassImp(TGuiBuilder)
ClassImp(TGuiBldAction)

TGuiBuilder *gGuiBuilder = 0;
static TPluginHandler *gHandler = 0;

//______________________________________________________________________________
TGuiBldAction::TGuiBldAction(const char *name, const char *title,
               Int_t type,  TGLayoutHints *hints) :
   TNamed(name, title), fType(type), fHints(hints)
{
   // constructor

   fPicture = 0;
   fPic = 0;  
   fAct = "";
}

//______________________________________________________________________________
TGuiBldAction::~TGuiBldAction()
{
   // destructor
}

//______________________________________________________________________________
TGuiBuilder::TGuiBuilder()
{
   // constructor

   // load plugin
   if (!gGuiBuilder) {
      gHandler = gROOT->GetPluginManager()->FindHandler("TGuiBuilder");

      if (!gHandler || (gHandler->LoadPlugin() == -1)) return;

      gGuiBuilder = this;
      gHandler->ExecPlugin(0);
   } else {
      fAction      = 0;
      gGuiBuilder->Show();
   }
}

//______________________________________________________________________________
TGuiBuilder::~TGuiBuilder()
{
   // destructor
}

//______________________________________________________________________________
TGuiBuilder *TGuiBuilder::Instance()
{
   // return an instance of TGuiBuilder object

   return (gGuiBuilder? gGuiBuilder : new TGuiBuilder());
}