Empty Fl_Window?

This is a discussion on Empty Fl_Window? within the C++ Programming forums, part of the General Programming Boards category; Hi, I made a GUI for my project a few months ago and it worked fine. I left it alone ...

  1. #1
    Registered User
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    Empty Fl_Window?

    Hi,

    I made a GUI for my project a few months ago and it worked fine. I left it alone for a few months and then went back to add to it. But now the window is empty. I have a class called GUIWindow that is a subclass of Fl_Window and I put widgets on it in the constructor. Then in main I just call the constructor and return Fl::run(). The code I have is -

    GUIWindow constructor -

    Code:
    GUIWindow::GUIWindow(Robot& r) : Fl_Window(500, 400, "iRobot Create"), robot(&r) {
        begin();    //make the widgets, button for each option
    
            fullMode = new Fl_Button(25, 300, 90, 30, "Full Mode");
            fullMode->when(FL_WHEN_RELEASE);
            fullMode->callback(cb_fullmode, this);
            fullMode->shortcut('f');
    
            safeMode = new Fl_Button(25, 350, 90, 30, "Safe Mode");
            safeMode->when(FL_WHEN_RELEASE);
            safeMode->callback(cb_safemode, this);
            safeMode->shortcut('s');
            velocity = new Fl_Input(230, 25, 50, 30, "Velocity");
    
            drive = new Fl_Button(25, 75, 70, 30, "Drive");
            drive->when(FL_WHEN_RELEASE);
            drive->callback(cb_drive, this);
            drive->shortcut('d');
    
            driveRadius = new Fl_Input(150, 75, 50, 30, "Radius");
    
            turn = new Fl_Button(300, 75, 60, 30, "Turn");
            turn->when(FL_WHEN_RELEASE);
            turn->callback(cb_turn, this);
            turn->shortcut('t');
    
            //more widgets...
    
        end();  //end making widgets
        robot->fullMode();
        robot->streamSensors();
        Fl::add_idle(IdleCallback, this);
        resizable(this);
        show(); //show it
    
    }

    in main -

    Code:
            Robot robot(robot_port, ROBOT_BAUDRATE, direction[0]);
            GUIWindow window(robot);
            return Fl::run();

    Whenever I run, the window comes up and the idle callback works, but the window has no widgets and it closes if I click in it.

    I don't think this is an issue, but I made it using Ubuntu and now I'm using Debian.

    I tried a basic example from the web and it works. And I can't see what is that much different from my code.

    Code:
    void but_cb( Fl_Widget* o, void*  ) {
       Fl_Button* b=(Fl_Button*)o;
       b->label("Good job"); //redraw not necessary
    
       b->resize(10,150,140,30); //redraw needed
       b->redraw();
    }
    
    int main() {
            Fl_Window win( 300,200,"Testing" );
            win.begin();
               Fl_Button but( 10, 150, 70, 30, "Click me" );
            win.end();
            but.callback( but_cb );
            win.show();
            return Fl::run();
    }
    If anyone can help me see whats going wrong here I would be grateful.

  2. #2
    Registered User manasij7479's Avatar
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    The exact same code shows a blank window ?
    Then report a bug.
    Manasij Mukherjee | gcc-4.8.2 @Arch Linux
    Slow and Steady wins the race... if and only if :
    1.None of the other participants are fast and steady.
    2.The fast and unsteady suddenly falls asleep while running !



  3. #3
    Registered User
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    Would I be filing the bug with Debian or FLTK?

  4. #4
    Registered User manasij7479's Avatar
    Join Date
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    Kolkata@India
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    Start by identifying whose problem this is, possibly by posting on the relevant forums(I'd say fltk.... maybe there is a version difference ?).
    Manasij Mukherjee | gcc-4.8.2 @Arch Linux
    Slow and Steady wins the race... if and only if :
    1.None of the other participants are fast and steady.
    2.The fast and unsteady suddenly falls asleep while running !



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