    // @(#)root/gui:$Name:  $:$Id: TGDockableFrame.cxx,v 1.3 2004/07/09 00:36:05 rdm Exp $
    // Author: Abdelhalim Ssadik   07/07/04

    /*************************************************************************
     * 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.             *
     *************************************************************************/
    /**************************************************************************

        This source is based on Xclass95, a Win95-looking GUI toolkit.
        Copyright (C) 1996, 1997 David Barth, Ricky Ralston, Hector Peraza.

        Xclass95 is free software; you can redistribute it and/or
        modify it under the terms of the GNU Library General Public
        License as published by the Free Software Foundation; either
        version 2 of the License, or (at your option) any later version.

    **************************************************************************/

    //////////////////////////////////////////////////////////////////////////
    //                                                                      //
    // A TGDockableFrame is a frame with handles that allow it to be        //
    // undocked (i.e. put in a transient frame of its own) and to be docked //
    // again or hidden and shown again. It uses the TGDockButton, which is  //
    // a button with two vertical bars (||) and TGDockHideButton, which is  //
    // a button with a small triangle. The TGUndockedFrame is a transient   //
    // frame that on closure will put the frame back in the dock.           //
    //                                                                      //
    //////////////////////////////////////////////////////////////////////////

    #include "TColor.h"
    #include "TGFrame.h"
    #include "TMessage.h"
    #include "TGWidget.h"
    #include "TGButton.h"
    #include "TGDockableFrame.h"
    #include "TGWindow.h"
    #include "TVirtualX.h"

    ClassImp(TGDockButton)
    ClassImp(TGDockHideButton)
    ClassImp(TGUndockedFrame)
    ClassImp(TGDockableFrame)

    //______________________________________________________________________________
     TGDockButton::TGDockButton(const TGCompositeFrame *p, int id) :
       TGButton (p, id, kChildFrame)
    {
       // Create a dock button (i.e. button with two vertical bars).

       fWidgetFlags = kWidgetIsEnabled;
       fMouseOn = kFALSE;
       Resize(10, GetDefaultHeight());

       fNormBg = fBackground;

       Float_t r, g, b, h, l, s;
       TColor::Pixel2RGB(fNormBg, r, g, b);
       TColor::RGB2HLS(r, g, b, h, l, s);
       l = l + (1. - l) * 45. / 100.;
       TColor::HLS2RGB(h, l, s, r, g, b);
       fHiBg = TColor::RGB2Pixel(r, g, b);

       AddInput(kEnterWindowMask | kLeaveWindowMask);
    }

    //______________________________________________________________________________
     TGDockButton::~TGDockButton()
    {
       // Delete dock button.

       fClient->FreeColor(fHiBg);
    }

    //______________________________________________________________________________
     Bool_t TGDockButton::HandleCrossing(Event_t *event)
    {
       // Handle dock button crossing events.

       TGButton::HandleCrossing(event);
       if (event->fType == kLeaveNotify) {
          fMouseOn = kFALSE;
       } else if (event->fType == kEnterNotify) {
          fMouseOn = kTRUE;
       }
       if (IsEnabled())
          fClient->NeedRedraw(this);

       return kTRUE;
    }

    //______________________________________________________________________________
     void TGDockButton::DrawBorder()
    {
       // Draw borders of dock button.

       int options = GetOptions();

       if (fState == kButtonDown || fState == kButtonEngaged)
          ;
       else if (fMouseOn == kTRUE && IsEnabled()) {
          SetBackgroundColor(fHiBg);
          ChangeOptions(kChildFrame);
       } else {
          SetBackgroundColor(fNormBg);
          ChangeOptions(kChildFrame);
       }
       gVirtualX->ClearWindow(fId);
       TGFrame::DrawBorder();

       ChangeOptions(options);
    }

    //______________________________________________________________________________
     void TGDockButton::DoRedraw()
    {
       // Draw the dock button, i.e. two vertical lines.

       int x = 1, y = 0;

       DrawBorder();
       if (fState == kButtonDown || fState == kButtonEngaged) { ++x; ++y; }

       for (int i = 0; i < 5; i +=4) {
          gVirtualX->DrawLine(fId, GetHilightGC()(), i+x,   y+1, i+x,   fHeight-y-3);
          gVirtualX->DrawLine(fId, GetShadowGC()(),  i+x+1, y+1, i+x+1, fHeight-y-3);
       }
    }

    //______________________________________________________________________________
    TGDockHideButton::TGDockHideButton(const TGCompositeFrame *p) :
       TGDockButton (p, 2)
    {
       // Create a dock hide button (i.e. button with small triangle).

       Resize(10, 8);
       fAspectRatio = 0;
    }

    //______________________________________________________________________________
    void TGDockHideButton::DoRedraw()
    {
       // Draw dock hide button.

       int x = 1, y = 0;

       DrawBorder();
       if (fState == kButtonDown || fState == kButtonEngaged) { ++x; ++y; }

       if (fAspectRatio) {
          gVirtualX->DrawLine(fId, GetBlackGC()(), x+1, y+1, x+5, y+3);
          gVirtualX->DrawLine(fId, GetBlackGC()(), x+1, y+5, x+5, y+3);
          gVirtualX->DrawLine(fId, GetHilightGC()(), x, y+1, x, y+5);
       } else {
          gVirtualX->DrawLine(fId, GetHilightGC()(), x+5, y+1, x+1, y+3);
          gVirtualX->DrawLine(fId, GetHilightGC()(), x+5, y+5, x+1, y+3);
          gVirtualX->DrawLine(fId, GetBlackGC()(), x+6, y+1, x+6, y+5);
       }
    }

    //______________________________________________________________________________
    TGUndockedFrame::TGUndockedFrame(const TGWindow *p, TGDockableFrame *dockable) :
       TGTransientFrame(p, dockable->GetMainFrame(), 10, 10)
    {
       // Create the undocked (transient) frame.

       SetWindowName("");
       fDockable = dockable;

       SetMWMHints(kMWMDecorAll | kMWMDecorResizeH | kMWMDecorMaximize |
                                  kMWMDecorMinimize | kMWMDecorMenu,
                   kMWMFuncAll | kMWMFuncResize | kMWMFuncMaximize |
                                 kMWMFuncMinimize,
                   kMWMInputModeless);
    }

    //______________________________________________________________________________
    TGUndockedFrame::~TGUndockedFrame()
    {
       // Delete undocked frame. Puts back dockable frame in its original container.

       fDockable->DockContainer(kFALSE);
    }

    //______________________________________________________________________________
    void TGUndockedFrame::FixSize()
    {
       // Fix the size of the undocked frame so it cannot be changed via the WM.

       SetWMSize(fWidth, fHeight);
       SetWMSizeHints(fWidth, fHeight, fWidth, fHeight, 0, 0);
    }

    //______________________________________________________________________________
    void TGUndockedFrame::CloseWindow()
    {
       // Close undocked frame (called via WM close button).

       DeleteWindow();
    }

    //______________________________________________________________________________
    TGDockableFrame::TGDockableFrame(const TGWindow *p, int id, UInt_t /*options*/)
       : TGCompositeFrame(p, 10, 10, kHorizontalFrame), TGWidget(id)
    {
       // Create a dockable frame widget.

       fMsgWindow = fParent;

       fCl = new TGLayoutHints(kLHintsExpandY | kLHintsExpandX);

       TGLayoutHints *l1 = new TGLayoutHints(kLHintsTop | kLHintsLeft);
       TGLayoutHints *l2 = new TGLayoutHints(kLHintsExpandY | kLHintsLeft);
       TGLayoutHints *lb = new TGLayoutHints(kLHintsExpandY | kLHintsLeft, 0, 2, 0, 0);
       TGLayoutHints *lc = new TGLayoutHints(kLHintsExpandY | kLHintsExpandX);

       SetCleanup();

       fButtons = new TGCompositeFrame(this, 10, 10, kVerticalFrame);
       fButtons->SetCleanup();
       fHideButton = new TGDockHideButton(fButtons);
       fButtons->AddFrame(fHideButton, l1);
       fDockButton = new TGDockButton(fButtons);
       fButtons->AddFrame(fDockButton, l2);

       TGCompositeFrame::AddFrame(fButtons, lb);

       fContainer = new TGCompositeFrame(this, 10, 10);

       TGCompositeFrame::AddFrame(fContainer, lc);

       fEnableHide   = kTRUE;
       fEnableUndock = kTRUE;
       fHidden       = kFALSE;
       fFrame        = 0;

       fDockButton->Associate(this);
       fHideButton->Associate(this);

       MapSubwindows();
       Resize(GetDefaultSize());
    }

    //______________________________________________________________________________
    TGDockableFrame::~TGDockableFrame()
    {
       // Cleanup dockable frame.

       if (fFrame)
          delete fFrame;
       delete fCl;
    }

    //______________________________________________________________________________
    void TGDockableFrame::AddFrame(TGFrame *f, TGLayoutHints *hints)
    {
       // Add frame to dockable frame container. Frame and hints are NOT adopted.

       f->ReparentWindow(fContainer);
       fContainer->AddFrame(f, fHints = hints);
       fContainer->Layout();
    }

    //______________________________________________________________________________
    void TGDockableFrame::UndockContainer()
    {
       // Undock container.

       int ax, ay;
       Window_t wdummy;

       if (fFrame || !fEnableUndock) return;

       fFrame = new TGUndockedFrame(fClient->GetRoot(), this);

       RemoveFrame(fContainer);
       fContainer->ReparentWindow(fFrame);
       fFrame->AddFrame(fContainer, fCl);  // fHints

       gVirtualX->TranslateCoordinates(GetId(), fClient->GetRoot()->GetId(), fX,
                                       fY + fFrame->GetHeight(), ax, ay, wdummy);

       if (fDockName) fFrame->SetWindowName(fDockName);

       fFrame->MapSubwindows();
       fFrame->Resize(fFrame->GetDefaultSize());
       fFrame->FixSize();
       fFrame->Move(ax, ay);
       fFrame->SetWMPosition(ax, ay);
       fFrame->MapWindow();

       if (((TGFrame *)fParent)->IsComposite())           // paranoia check
          ((TGCompositeFrame *)fParent)->HideFrame(this);

       Layout();

       SendMessage(fMsgWindow, MK_MSG(kC_DOCK, kDOCK_UNDOCK), fWidgetId, 0);
       Undocked();
    }

    //______________________________________________________________________________
    void TGDockableFrame::DockContainer(Int_t del)
    {
       // Dock container back to TGDockableFrame.

       if (!fFrame) return;
       if (del) {
          delete fFrame;  // this will call DockContainer again with del = kFALSE
          return;
       }

       fFrame->RemoveFrame(fContainer);
       fContainer->ReparentWindow(this);
       TGCompositeFrame::AddFrame(fContainer, fCl);  // fHints

       // kludge! (for special case)
       fDockButton->Resize(fDockButton->GetDefaultWidth(), 1);

       Layout();
       if (((TGFrame *)fParent)->IsComposite())           // paranoia check
          ((TGCompositeFrame *)fParent)->ShowFrame(this);

       // fFrame is just being deleted (we're here called by TGUndockedFrame's
       // destructor) so just set it NULL below to avoid eventual problems in
       // TGDockableFrame's destructor.

       fFrame = 0;

       SendMessage(fMsgWindow, MK_MSG(kC_DOCK, kDOCK_DOCK), fWidgetId, 0);
       Docked();
    }

    //______________________________________________________________________________
    void TGDockableFrame::ShowContainer()
    {
       // Show dock container.

       if (!fHidden) return;

       ShowFrame(fContainer);
       if (fEnableUndock) fButtons->ShowFrame(fDockButton);
       fHideButton->SetAspectRatio(0);
       if (((TGFrame *)fParent)->IsComposite())           // paranoia check
          ((TGCompositeFrame *)fParent)->Layout();
       fHidden = kFALSE;

       SendMessage(fMsgWindow, MK_MSG(kC_DOCK, kDOCK_SHOW), fWidgetId, 0);
    }

    //______________________________________________________________________________
    void TGDockableFrame::HideContainer()
    {
       // Hide dock container.

       if (fHidden || !fEnableHide) return;

       HideFrame(fContainer);
       fButtons->HideFrame(fDockButton);
       fHideButton->SetAspectRatio(1);
       if (((TGFrame *)fParent)->IsComposite())           // paranoia check
          ((TGCompositeFrame *)fParent)->Layout();
       fHidden = kTRUE;

       SendMessage(fMsgWindow, MK_MSG(kC_DOCK, kDOCK_HIDE),fWidgetId, 0);
    }

    //______________________________________________________________________________
    Bool_t TGDockableFrame::ProcessMessage(Long_t msg, Long_t parm1, Long_t)
    {
       // Process dockable frame messages.

       switch (GET_MSG(msg)) {
          case kC_COMMAND:
             switch (GET_SUBMSG(msg)) {
                case kCM_BUTTON:
                   switch (parm1) {
                      case 1:
                         if (!fHidden) UndockContainer();
                         break;
                      case 2:
                         if (!fHidden)
                            HideContainer();
                         else
                            ShowContainer();
                         break;
                   }
                   break;
             }
             break;
       }

       return kTRUE;
    }

    //______________________________________________________________________________
    void TGDockableFrame::EnableUndock(Bool_t onoff)
    {
       // Enable undocking.

       fEnableUndock = onoff;
       if (onoff)
          fButtons->ShowFrame(fDockButton);
       else
          fButtons->HideFrame(fDockButton);
       Layout();
    }

    //______________________________________________________________________________
    void TGDockableFrame::EnableHide(Bool_t onoff)
    {
       // Enable hiding.

       fEnableHide = onoff;
       if (onoff)
          fButtons->ShowFrame(fHideButton);
       else
          fButtons->HideFrame(fHideButton);
       Layout();
    }

    //______________________________________________________________________________
    void TGDockableFrame::SetWindowName(const char *name)
    {
       // Set window name so it appear as title of the undock window.

       fDockName = "";
       if (name) {
          fDockName = name;
          if (fFrame) fFrame->SetWindowName(fDockName);
       }
    }