Re: How to make a gui

From: Roger Mason <rmason_at_esd.mun.ca>
Date: Wed, 22 Feb 2006 10:15:52 -0330

Hello Rene,

Rene Brun <Rene.Brun_at_cern.ch> writes:

> see tutorial Slider3Demo.C (introduced a few weeks ago in CVS)
>
> Rene Brun

Thanks for your reply. I had a look through that tutorial and I think I understand much of its workings.

perhaps I should be more specific about the problem I'm having. I have the following code fragment in a class MyMainFrame:

  // Vertical frame
  fMainV = new TGVerticalFrame(fMainH,w/3,h);   fMainH->AddFrame(fMainV, new TGLayoutHints(kLHintsExpandY | kLHintsExpandX,10,10,10,1));   fComboFuncNames = new TGComboBox(fMainV,100);   for (Int_t i = 0; i < 4; i++) {
    fComboFuncNames->AddEntry(funcnames[i], i+1);   }

  fComboFuncNames->Resize(w/10,h/20);
  fComboFuncNames->Select(1);
  fComboFuncNames->Connect("Selected(Int_t)","MyMainFrame",this,"DoComboSelect(Int_t)");

  fLcombo = new TGLayoutHints(kLHintsTop | kLHintsLeft,5,5,5,5);   fMainV->AddFrame(fComboFuncNames,fLcombo);   // Sliders should be added here but defer until the selection is made in   // fComboFuncNames so we know how many to create.

When an item is selected in fComboFuncNames the following function is called. It is intended that this function should create a number of sliders, the number created being dependent on the selected function.

void MyMainFrame::DoComboSelect(Int_t sel) {   // Update the sliders depending on which function gets selected in   // the function selection combo.

  Int_t nparm;
  switch (sel) {
  case 1 : nparm = 3; // Gaussian
    break;
  case 2 : nparm = 3; // Lorentzian
    break;
  case 3 : nparm = 5; // Voigtian
    break;
  case 4 : nparm = 10; // Background (max order)     break;
  default: nparm = 9;
  }
  // cout << "nparm = " << nparm << endl;

  for (Int_t i = 0; i < nparm; i++ ) {
    VSid[i] = i;
    TEid[i] = i;

    fVSparms[i] = new TGVSlider(fMainV, 100, kSlider2, VSid[i]);
    fTEparms[i] = new TGTextEntry(fMainV, fTBparms[i] = new TGTextBuffer(10), TEid[i]);
    fTBparms[i]->AddText(0, "0");

  }

  //--- layout for sliders
  fLslider = new TGLayoutHints(kLHintsTop | kLHintsLeft, 0, 0, 3, 0);

  for (Int_t i = 0; i < nparm; i++ ) {
    fMainV->AddFrame(fVSparms[i], fLslider);     fMainV->AddFrame(fTEparms[i], fLslider);     fTEparms[i]->Connect("TextChanged(char*)", "MyMainFrame", this, "DoText(char*)");   }

}

The combo box is drawn correctly but when I make a selection the following error is returned:

root [0] .x MyExample.C
.x MyExample.C
root [1] Error: Can't call TGVerticalFrame::AddFrame(fVSparms[i],fLslider) in current scopePossible candidates are...

filename       line:size busy function type and name  (in TGVerticalFrame)
filename       line:size busy function type and name  (in TGCompositeFrame)
/usr/local/lib/root/libGui.so  -1:-1   0 public: virtual void AddFrame(TGFrame* f,TGLayoutHints* l=0);
filename       line:size busy function type and name  (in TGFrame)
filename       line:size busy function type and name  (in TGWindow)
filename       line:size busy function type and name  (in TGObject)
filename       line:size busy function type and name  (in TObject)
filename       line:size busy function type and name  (in TQObject)

Error: Can't call TGVerticalFrame::AddFrame(fVSparms[i],fLslider) in current scope /home/rmason/Programming/rootmac/MyExample.C:265: Possible candidates are...

filename       line:size busy function type and name  (in TGVerticalFrame)
filename       line:size busy function type and name  (in TGCompositeFrame)
/usr/local/lib/root/libGui.so  -1:-1   0 public: virtual void AddFrame(TGFrame* f,TGLayoutHints* l=0);
filename       line:size busy function type and name  (in TGFrame)
filename       line:size busy function type and name  (in TGWindow)
filename       line:size busy function type and name  (in TGObject)
filename       line:size busy function type and name  (in TObject)
filename       line:size busy function type and name  (in TQObject)

Error: Symbol fMainV is not defined in current scope /home/rmason/Programming/rootmac/MyExample.C:265: Error: Failed to evaluate fMainV->AddFrame(fVSparms[i],fLslider)Possible candidates are... filename line:size busy function type and name

I'm sure my poor understanding of C++ is responsible for the problem. Any help you can offer will be most appreciated.

Thanks,

Roger Received on Wed Feb 22 2006 - 14:46:37 MET