Re: [ROOT] Closing a TGFrame.

From: Fons Rademakers (Fons.Rademakers@cern.ch)
Date: Thu Oct 18 2001 - 00:58:37 MEST 

Hi Brett,

  it is important that you connect a function to the TGMainFrame CloseWindow()
signal in which you delete the frame and all other widgets. The default
TGMainFrame::CloseWindow() just closes the TGMainFrame (i.e. destroys the
associated X11 window, but does not delete the TGMainFrame object). See 
modified example below (note, don't do as in this example but use a proper
class to contain fFrame and fButton):

// -- dork.C
TGMainFrame *gFrame;
TGButton *gButton;

void MyCloseWindow()
{
   printf("MyCloseWindow()\n");
   delete gButton;
   delete gFrame;
}

void dork ()
{
    cerr << "Dork!\n";

    TGMainFrame* fFrame = new TGMainFrame(gClient->GetRoot(),500U,500U);
    fFrame->Connect("CloseWindow()", 0, 0, "MyCloseWindow()");
    TGButton* fButton = new TGTextButton(fFrame,"Die",0);
    fButton->Connect("Clicked()","TGMainFrame",fFrame,"SendCloseMessage()");
    TGLayoutHints* loh = new TGLayoutHints(kLHintsTop | kLHintsLeft);
    fFrame->AddFrame(fButton,loh);
    fFrame->Layout();
    fFrame->MapSubwindows();
    fFrame->Resize(fFrame->GetDefaultSize());
    fFrame->MapWindow();
    cerr << "Frame at: " << fFrame << endl;

    gFrame = fFrame;
    gButton = fButton;
}


In this case it also works as expected when closing the window via the
Window Close button in Window Manager decoration.


Cheers, Fons.

PS: 

On Wednesday 17 October 2001 20:48, Brett Viren wrote:
> Hi again.  More info:
>
> Here is a short example
>
> void dorktest ()
> {
>     cerr << "Dork!\n";
>
>     TGMainFrame* fFrame = new TGMainFrame(gClient->GetRoot(),500U,500U);
>     TGButton* fButton = new TGTextButton(fFrame,"Die",0);
>    
> fButton->Connect("Clicked()","TGMainFrame",fFrame,"SendCloseMessage()");
> TGLayoutHints* loh = new TGLayoutHints(kLHintsTop | kLHintsLeft);
> fFrame->AddFrame(fButton,loh);
>     fFrame->Layout();
>     fFrame->MapSubwindows();
>     fFrame->Resize(fFrame->GetDefaultSize());
>     fFrame->MapWindow();
>     cerr << "Frame at: " << fFrame << endl;
> }
>
> Run it like:
> root [0]  gObjectTable->SetObjectStat(true)
> root [1]  gObjectTable->Print();
> ...
> [ no TGMainFrame or TGButtons ... ]
> root [2] .x test/dorktest.C
> Dork!
> Frame at: 0x86d3b78
> root [3]  gObjectTable->Print();
> ...
> TGMainFrame                 1          1       84            84          
> 84 TGTextButton                1          1      144           144         
> 144 ...
> [ now, click button, Frame goes away ]
> root [4]  gObjectTable->Print();
> ...
> TGMainFrame                 1          1       84            84          
> 84 TGTextButton                1          1      144           144         
> 144 ...
>
>
> So, what is the correct way to assure the Frame and Button get deleted?
>
> -Brett.

-- 
Org:    CERN, European Laboratory for Particle Physics.
Mail:   1211 Geneve 23, Switzerland
E-Mail: Fons.Rademakers@cern.ch              Phone: +41 22 7679248
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