Re: [fltk.general] How do I do this properly - Forums

On 10/5/22 21:15, roger tunnicliffe wrote:

I have some code as follows:-

void win2_showChart(Fl_Widget *w, void *data)
{
win2_accountNo_callback(win2,&xNull);
for (int k;k<1000000;k++){;}
win2_tabs->hide();
win2_chart->show();
win2->redraw();
}

win2_accountNo_callback sets a new value for FL_Output, however unless I put in the "timer" to "slow something down ??" it will not display correctly. I thought that's what win2->redraw was supposed to do ?

    Hmm, you shouldn't have to slow anything down to get a widget to update.
    redraw() schedules that widget (and its children) to redraw when you return
    to the application loop, and redrawing is handled by that, to ensure the
    widgets are drawn in order (parents first, then children).

    It looks like you're even telling the parent window to redraw, which should
    redraw everything in that window.

    If it's not redrawing properly, possible causes are:

        * Child widgets are created outside their parent's xywh boundaries
        * Child widgets are not parented properly, which can happen if the groups aren't end()ed.

    It would in this case help to see more of your code, esp. the part where you
    construct the widgets (win2, win2_tabs, win2_chart, etc), or if you can replicate by
    creating a small, self contained single file that is an easily buildable application
    so we can see what's going on.

    Sometimes you can discover the issue yourself in the process of building
    a simplified app, i.e. catch a bug in the construction.

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