TRootEmbeddedCanvas.cxx

Go to the documentation of this file.

// @(#)root/gui:$Id$
// Author: Fons Rademakers   15/07/98
 
/*************************************************************************
 * 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.             *
 *************************************************************************/
 
 
/** \class TRootEmbeddedCanvas
    \ingroup guiwidgets
 
This class creates a TGCanvas in which a TCanvas is created.
Use GetCanvas() to get a pointer to the TCanvas.
 
*/
 
 
#include "TRootEmbeddedCanvas.h"
#include "TCanvas.h"
#include "TROOT.h"
#include "TStyle.h"
#include "TPluginManager.h"
#include "TVirtualGL.h"
#include "TGDNDManager.h"
#include "TBufferFile.h"
#include "TImage.h"
#include "TClass.h"
#include "TUrl.h"
#include "TVirtualX.h"
 
#include <iostream>
 
 
/** \class TRootEmbeddedContainer
    \ingroup guiwidgets
 
Utility class used by TRootEmbeddedCanvas. The TRootEmbeddedContainer
is the frame embedded in the TGCanvas widget. The ROOT graphics goes
into this frame. This class is used to enable input events on this
graphics frame and forward the events to the TRootEmbeddedCanvas
handlers.
 
*/
 
 
class TRootEmbeddedContainer : public TGCompositeFrame {
private:
   TRootEmbeddedCanvas  *fCanvas;    // pointer back to embedded canvas
public:
   TRootEmbeddedContainer(TRootEmbeddedCanvas *c, Window_t id, const TGWindow *parent);
 
   Bool_t  HandleButton(Event_t *ev) override
               { return fCanvas->HandleContainerButton(ev); }
   Bool_t  HandleDoubleClick(Event_t *ev) override
               { return fCanvas->HandleContainerDoubleClick(ev); }
   Bool_t  HandleConfigureNotify(Event_t *ev) override
               { TGFrame::HandleConfigureNotify(ev);
                  return fCanvas->HandleContainerConfigure(ev); }
   Bool_t  HandleKey(Event_t *ev) override
               { return fCanvas->HandleContainerKey(ev); }
   Bool_t  HandleMotion(Event_t *ev) override
               { return fCanvas->HandleContainerMotion(ev); }
   Bool_t  HandleExpose(Event_t *ev) override
               { return fCanvas->HandleContainerExpose(ev); }
   Bool_t  HandleCrossing(Event_t *ev) override
               { return fCanvas->HandleContainerCrossing(ev); }
   void    SetEditable(Bool_t) override {}
};
 
////////////////////////////////////////////////////////////////////////////////
/// Create a canvas container.
 
TRootEmbeddedContainer::TRootEmbeddedContainer(TRootEmbeddedCanvas *c, Window_t id,
   const TGWindow *p) : TGCompositeFrame(gClient, id, p)
{
   fCanvas = c;
 
   gVirtualX->GrabButton(fId, kAnyButton, kAnyModifier,
                         kButtonPressMask | kButtonReleaseMask |
                         kPointerMotionMask, kNone, kNone);
 
   AddInput(kKeyPressMask | kKeyReleaseMask | kPointerMotionMask |
            kExposureMask | kStructureNotifyMask | kLeaveWindowMask);
 
   fEditDisabled = kEditDisableGrab;
}
 
 
////////////////////////////////////////////////////////////////////////////////
/// Create an TCanvas embedded in a TGFrame. A pointer to the TCanvas can
/// be obtained via the GetCanvas() member function. To embed a canvas
/// derived from a TCanvas do the following:
/// TRootEmbeddedCanvas *embedded = new TRootEmbeddedCanvas(0, p, w, h);
///      [note name must be 0, not null string ""]
/// Int_t wid = embedded->GetCanvasWindowId();
/// TMyCanvas *myc = new TMyCanvas("myname", 10, 10, wid);
/// embedded->AdoptCanvas(myc);
///      [ the MyCanvas is adopted by the embedded canvas and will be
///        destroyed by it ]
 
TRootEmbeddedCanvas::TRootEmbeddedCanvas(const char *name, const TGWindow *p,
            UInt_t w, UInt_t h, UInt_t options, Pixel_t back)
   : TGCanvas(p, w, h, options, back)
{
   fCanvas  = 0;
   fButton  = 0;
   fAutoFit = kTRUE;
   fEditDisabled = kEditDisableLayout;
 
   fCWinId = -1;
 
   if (gStyle->GetCanvasPreferGL()) {
      //first, initialize GL (if not yet)
      if (!gGLManager) {
         TString x = "win32";
         if (gVirtualX->InheritsFrom("TGX11"))
            x = "x11";
         else if (gVirtualX->InheritsFrom("TGCocoa"))
            x = "osx";
 
         TPluginHandler *ph = gROOT->GetPluginManager()->FindHandler("TGLManager", x);
 
         if (ph && ph->LoadPlugin() != -1) {
            if (!ph->ExecPlugin(0)) {
               Warning("CreateCanvas",
                       "Cannot load GL, will use default canvas imp instead\n");
            }
         }
      }
 
      if (gGLManager)
         fCWinId = gGLManager->InitGLWindow((ULongptr_t)GetViewPort()->GetId());
      //Context creation deferred till TCanvas creation (since there is no way to pass it to TCanvas).
 
      if (!gGLManager || fCWinId == -1)
         gStyle->SetCanvasPreferGL(kFALSE);//TCanvas should not use gl.
   }
   if (fCWinId == -1)
      fCWinId = gVirtualX->InitWindow((ULongptr_t)GetViewPort()->GetId());
 
   Window_t win = gVirtualX->GetWindowID(fCWinId);
   fCanvasContainer = new TRootEmbeddedContainer(this, win, GetViewPort());
   SetContainer(fCanvasContainer);
 
   TString cname;
   if (name) cname = name;
   else cname = TString::Format("%s_canvas", GetName());
   fCanvas = new TCanvas(cname.Data(), w, h, fCWinId);
 
   // define DND types
   fDNDTypeList = new Atom_t[3];
   fDNDTypeList[0] = gVirtualX->InternAtom("application/root", kFALSE);
   fDNDTypeList[1] = gVirtualX->InternAtom("text/uri-list", kFALSE);
   fDNDTypeList[2] = 0;
   gVirtualX->SetDNDAware(fId, fDNDTypeList);
   SetDNDTarget(kTRUE);
 
   if (!p) {
      fCanvas->SetBorderMode(0);
      MapSubwindows();
      Resize(100, 100);
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Delete embedded ROOT canvas.
 
TRootEmbeddedCanvas::~TRootEmbeddedCanvas()
{
   if (!MustCleanup()) {
      delete fCanvas;
      delete fCanvasContainer;
   }
   delete [] fDNDTypeList;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Canvas c is adopted from this embedded canvas.
 
void TRootEmbeddedCanvas::AdoptCanvas(TCanvas *c)
{
   if(c == 0) return;
   c->EmbedInto(fCWinId, fWidth, fHeight);
   fCanvas = c;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Handle mouse button events in the canvas container.
 
Bool_t TRootEmbeddedCanvas::HandleContainerButton(Event_t *event)
{
   if (!fCanvas) return kTRUE;
 
   Int_t button = event->fCode;
   Int_t x = event->fX;
   Int_t y = event->fY;
 
   if (event->fType == kButtonPress) {
      fButton = button;
      if (button == kButton1) {
         if (event->fState & kKeyShiftMask)
            fCanvas->HandleInput(EEventType(7), x, y);
         else
            fCanvas->HandleInput(kButton1Down, x, y);
      }
      if (button == kButton2)
         fCanvas->HandleInput(kButton2Down, x, y);
      if (button == kButton3) {
         fCanvas->HandleInput(kButton3Down, x, y);
         fButton = 0;  // button up is consumed by TContextMenu
      }
 
   } else if (event->fType == kButtonRelease) {
      if (button == kButton1)
         fCanvas->HandleInput(kButton1Up, x, y);
      if (button == kButton2)
         fCanvas->HandleInput(kButton2Up, x, y);
      if (button == kButton3)
         fCanvas->HandleInput(kButton3Up, x, y);
      if (button == kButton4)
         fCanvas->HandleInput(EEventType(5), x, y);//hack
      if (button == kButton5)
         fCanvas->HandleInput(EEventType(6), x, y);//hack
 
      fButton = 0;
   }
 
   return kTRUE;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Handle mouse button double click events in the canvas container.
 
Bool_t TRootEmbeddedCanvas::HandleContainerDoubleClick(Event_t *event)
{
   if (!fCanvas) return kTRUE;
 
   Int_t button = event->fCode;
   Int_t x = event->fX;
   Int_t y = event->fY;
 
   if (button == kButton1)
      fCanvas->HandleInput(kButton1Double, x, y);
   if (button == kButton2)
      fCanvas->HandleInput(kButton2Double, x, y);
   if (button == kButton3)
      fCanvas->HandleInput(kButton3Double, x, y);
 
   return kTRUE;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Handle configure (i.e. resize) event.
 
Bool_t TRootEmbeddedCanvas::HandleContainerConfigure(Event_t *)
{
   if (fAutoFit && fCanvas) {
      fCanvas->Resize();
      fCanvas->Update();
   }
   return kTRUE;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Handle keyboard events in the canvas container.
 
Bool_t TRootEmbeddedCanvas::HandleContainerKey(Event_t *event)
{
   static EGEventType previous_event = kOtherEvent;
   static UInt_t previous_keysym = 0;
 
   if (!fCanvas) return kTRUE;
 
   if (event->fType == kGKeyPress) {
      fButton = event->fCode;
      UInt_t keysym;
      char str[2];
      gVirtualX->LookupString(event, str, sizeof(str), keysym);
 
      if (str[0] == kESC){   // ESC sets the escape flag
         gROOT->SetEscape();
         fCanvas->HandleInput(kButton1Up, 0, 0);
         fCanvas->HandleInput(kMouseMotion, 0, 0);
         gPad->Modified();
         return kTRUE;
      }
      if (str[0] == 3)   // ctrl-c sets the interrupt flag
         gROOT->SetInterrupt();
 
      // handle arrow keys
      if (keysym > 0x1011 && keysym < 0x1016) {
         Window_t dum1, dum2, wid;
         UInt_t mask = 0;
         Int_t mx, my, tx, ty;
         wid = gVirtualX->GetDefaultRootWindow();
         gVirtualX->QueryPointer(wid, dum1, dum2, mx, my, mx, my, mask);
         gVirtualX->TranslateCoordinates(gClient->GetDefaultRoot()->GetId(),
                                         fCanvasContainer->GetId(),
                                         mx, my, tx, ty, dum1);
         fCanvas->HandleInput(kArrowKeyPress, tx, ty);
         // handle case where we got consecutive same keypressed events coming
         // from auto-repeat on Windows (as it fires only successive keydown events)
         if ((previous_keysym == keysym) && (previous_event == kGKeyPress)) {
            switch (keysym) {
               case 0x1012: // left
                  gVirtualX->Warp(--mx, my, wid); --tx;
                  break;
               case 0x1013: // up
                  gVirtualX->Warp(mx, --my, wid); --ty;
                  break;
               case 0x1014: // right
                  gVirtualX->Warp(++mx, my, wid); ++tx;
                  break;
               case 0x1015: // down
                  gVirtualX->Warp(mx, ++my, wid); ++ty;
                  break;
               default:
                  break;
            }
            fCanvas->HandleInput(kArrowKeyRelease, tx, ty);
         }
         previous_keysym = keysym;
      }
      else {
         fCanvas->HandleInput(kKeyPress, str[0], keysym);
      }
   } else if (event->fType == kKeyRelease) {
      UInt_t keysym;
      char str[2];
      gVirtualX->LookupString(event, str, sizeof(str), keysym);
 
      if (keysym > 0x1011 && keysym < 0x1016) {
         Window_t dum1, dum2, wid;
         UInt_t mask = 0;
         Int_t mx, my, tx, ty;
         wid = gVirtualX->GetDefaultRootWindow();
         gVirtualX->QueryPointer(wid, dum1, dum2, mx, my, mx, my, mask);
         switch (keysym) {
            case 0x1012: // left
               gVirtualX->Warp(--mx, my, wid);
               break;
            case 0x1013: // up
               gVirtualX->Warp(mx, --my, wid);
               break;
            case 0x1014: // right
               gVirtualX->Warp(++mx, my, wid);
               break;
            case 0x1015: // down
               gVirtualX->Warp(mx, ++my, wid);
               break;
            default:
               break;
         }
         gVirtualX->TranslateCoordinates(gClient->GetDefaultRoot()->GetId(),
                                         fCanvasContainer->GetId(),
                                         mx, my, tx, ty, dum1);
         fCanvas->HandleInput(kArrowKeyRelease, tx, ty);
         previous_keysym = keysym;
      }
      fButton = 0;
   }
   previous_event = event->fType;
   return kTRUE;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Handle mouse motion event in the canvas container.
 
Bool_t TRootEmbeddedCanvas::HandleContainerMotion(Event_t *event)
{
   if (!fCanvas) return kTRUE;
 
   Int_t x = event->fX;
   Int_t y = event->fY;
 
   if (fButton == 0)
      fCanvas->HandleInput(kMouseMotion, x, y);
   if (fButton == kButton1) {
      if (event->fState & kKeyShiftMask)
         fCanvas->HandleInput(EEventType(8), x, y);
      else
         fCanvas->HandleInput(kButton1Motion, x, y);
   }
   if (fButton == kButton2)
      fCanvas->HandleInput(kButton2Motion, x, y);
 
   return kTRUE;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Handle expose events.
 
Bool_t TRootEmbeddedCanvas::HandleContainerExpose(Event_t *event)
{
   if (!fCanvas) return kTRUE;
 
   if (event->fCount == 0)
      fCanvas->Flush();
 
   return kTRUE;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Handle enter/leave events. Only leave is activated at the moment.
 
Bool_t TRootEmbeddedCanvas::HandleContainerCrossing(Event_t *event)
{
   if (!fCanvas) return kTRUE;
 
   Int_t x = event->fX;
   Int_t y = event->fY;
 
   // pointer grabs create also an enter and leave event but with fCode
   // either kNotifyGrab or kNotifyUngrab, don't propagate these events
   if (event->fType == kLeaveNotify && event->fCode == kNotifyNormal)
      fCanvas->HandleInput(kMouseLeave, x, y);
 
   return kTRUE;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Handle drop events.
 
Bool_t TRootEmbeddedCanvas::HandleDNDDrop(TDNDData *data)
{
   static Atom_t rootObj  = gVirtualX->InternAtom("application/root", kFALSE);
   static Atom_t uriObj  = gVirtualX->InternAtom("text/uri-list", kFALSE);
 
   if (data->fDataType == rootObj) {
      TBufferFile buf(TBuffer::kRead, data->fDataLength, (void *)data->fData);
      buf.SetReadMode();
      TObject *obj = (TObject *)buf.ReadObjectAny(TObject::Class());
      if (!obj) return kTRUE;
      gPad->Clear();
      if (obj->InheritsFrom("TKey")) {
         TObject *object = (TObject *)gROOT->ProcessLine(Form("((TKey *)0x%zx)->ReadObj();", (size_t)obj));
         if (!object) return kTRUE;
         if (object->InheritsFrom("TGraph"))
            object->Draw("ALP");
         else if (object->InheritsFrom("TImage"))
            object->Draw("x");
         else if (object->IsA()->GetMethodAllAny("Draw"))
            object->Draw();
      }
      else if (obj->InheritsFrom("TGraph"))
         obj->Draw("ALP");
      else if (obj->IsA()->GetMethodAllAny("Draw"))
         obj->Draw();
      gPad->Modified();
      gPad->Update();
      return kTRUE;
   }
   else if (data->fDataType == uriObj) {
      TString sfname((char *)data->fData);
      if (sfname.Length() > 7) {
         sfname.ReplaceAll("\r\n", "");
         TUrl uri(sfname.Data());
         if (sfname.EndsWith(".bmp") ||
            sfname.EndsWith(".gif") ||
            sfname.EndsWith(".jpg") ||
            sfname.EndsWith(".png") ||
            sfname.EndsWith(".ps")  ||
            sfname.EndsWith(".eps") ||
            sfname.EndsWith(".pdf") ||
            sfname.EndsWith(".tiff") ||
            sfname.EndsWith(".xpm")) {
            TImage *img = TImage::Open(uri.GetFile());
            if (img) {
               img->Draw("x");
               img->SetEditable(kTRUE);
            }
         }
         gPad->Modified();
         gPad->Update();
      }
   }
   return kFALSE;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Handle dragging position events.
 
Atom_t TRootEmbeddedCanvas::HandleDNDPosition(Int_t /*x*/, Int_t /*y*/, Atom_t action,
                                              Int_t xroot, Int_t yroot)
{
   Int_t    px = 0, py = 0;
   Window_t wtarget;
 
   gVirtualX->TranslateCoordinates(gClient->GetDefaultRoot()->GetId(),
                                   gVirtualX->GetWindowID(fCanvas->GetCanvasID()),
                                   xroot, yroot, px, py, wtarget);
 
   TPad *pad = fCanvas->Pick(px, py, 0);
   if (pad) {
      pad->cd();
      gROOT->SetSelectedPad(pad);
      // make sure the pad is highlighted (on Windows)
      pad->Update();
   }
   return action;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Handle drag enter events.
 
Atom_t TRootEmbeddedCanvas::HandleDNDEnter(Atom_t *typelist)
{
   static Atom_t rootObj  = gVirtualX->InternAtom("application/root", kFALSE);
   static Atom_t uriObj  = gVirtualX->InternAtom("text/uri-list", kFALSE);
   Atom_t ret = kNone;
   for (int i = 0; typelist[i] != kNone; ++i) {
      if (typelist[i] == rootObj)
         ret = rootObj;
      if (typelist[i] == uriObj)
         ret = uriObj;
   }
   return ret;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Handle drag leave events.
 
Bool_t TRootEmbeddedCanvas::HandleDNDLeave()
{
   return kTRUE;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Save an embedded canvas as a C++ statement(s) on output stream out.
 
void TRootEmbeddedCanvas::SavePrimitive(std::ostream &out, Option_t *option /*= ""*/)
{
   if (!GetCanvas())
      return;
 
   auto extra_args = SaveCtorArgs(out, kSunkenFrame | kDoubleBorder);
 
   out << "\n   // embedded canvas\n";
   out << "   TRootEmbeddedCanvas *" << GetName() << " = new TRootEmbeddedCanvas(0" << "," << fParent->GetName() << ","
       << GetWidth() << "," << GetHeight() << extra_args << ");\n";
 
   if (option && strstr(option, "keep_names"))
      out << "   " << GetName() << "->SetName(\"" << GetName() << "\");\n";
 
   out << "   Int_t w" << GetName() << " = " << GetName() << "->GetCanvasWindowId();\n";
 
   static int n = 123;
   TString cname = TString::Format("c%d", n);
 
   out << "   TCanvas *" << cname << " = new TCanvas(\"" << cname << "\", 10, 10, w" << GetName() << ");\n";
   out << "   " << GetName() << "->AdoptCanvas(" << cname << ");\n";
 
   n++;
   // Next line is a connection to TCanvas::SavePrimitives()
   // GetCanvas()->SavePrimitive(out,option);
}