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removing/replacing widgets
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mikshaw
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removing/replacing widgets
I've been struggling with a way to dynamically replace existing widgets or groups of widgets.
Fl elete_widget() causes a segmentation fault, which I assume is my main problem with this task. The FLTK documentation lists Fl_Group::~Fl_Group() is supposed to destroy a group, but I have no idea how to translate this to murgaLua.
Are both instances of "Fl_Group" to be replaced with the name of the group? Is it name:~Fl_Group()? name:~name()? name:fltk:~FL_Group()? Maybe it doesn't translate to murgaLua?
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| 06-29-2007 02:01 AM |
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JohnMurga
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RE: removing/replacing widgets
You have to hide it first (always) ... Not hiding it causes a crash on Windows too ...
This example should work on Linux, I am about to test it :
local object = fltk:Fl_Double_Window(200, 100)
window = object
button1 = fltk:Fl_Button(25, 25, 150, 25, "Remove Button")
button2 = fltk:Fl_Button(25, 60, 150, 25, "Will go")
function remove_callback(data)
button2:hide()
Fl:delete_widget(button2)
end
button1:callback(remove_callback)
window:show()
Fl:run()
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| 06-29-2007 06:26 AM |
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JohnMurga
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RE: removing/replacing widgets
OK, this appears to work correctly on Windows, however under Linux it only works when removing windows for some reason (!!) ... Ummm, will look into this.
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| 06-29-2007 07:43 AM |
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mikshaw
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RE: removing/replacing widgets
It seems to work for me. Thank you. I didn't try your example, but used delete_widget() after hiding the widget I was already testing (a browser).
There is still a strange behaviour causing a segfault, though. There seems to be data left over somewhere relating to the deleted widget. If I try to show the deleted widget, or even check to see if it exists, the segfault occurs (where normally it would be an error message). If I set a new value to the widget's name after deleting it, segfault doesn't occur unless I get trigger-happy with the button that checks for it. Either way, it doesn't seem possible to create a new widget using the name of the deleted widget, so I still don't know if dynamically replacing widgets is possible. I know I could hide/show overlapping stuff, but that does not fit with my plan (simplicity and modularity). I'll be messing around with it for a while, though, so I'll keep you updated =o)
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| 06-29-2007 08:26 AM |
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JohnMurga
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RE: removing/replacing widgets
I found the issue !! :-)
Again, Linux being a little sensitive about the sequence.
This was tested on both Windows and Linux and never segfaults.
local object = fltk:Fl_Double_Window(200, 100);
window = object;
button1 = fltk:Fl_Button(25, 25, 150, 25, "Remove Button");
button2 = fltk:Fl_Button(25, 60, 150, 25, "Will go");
function remove_callback(data)
window:remove(button2)
Fl:delete_widget(button2)
window:redraw()
button2=nil
end
button1:callback(remove_callback)
window:show();
Fl:run();
This post was last modified: 06-30-2007 10:08 AM by JohnMurga.
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| 06-30-2007 10:06 AM |
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mikshaw
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RE: removing/replacing widgets
Yes, that does stop the segfaults. Thank you very much for this help.
One thing I should mention relating to my original post:
In order to dynamically replace the removed widget with a new one, apparently you need to use window:add(button2) after creating a new button2 widget. It took me a bit to figure out why it wasn't showing while I could still access its properties, even after button2:redraw() and window:redraw().
Also, what is the purpose of creating "local object" and then setting "window" to the same value?
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| 06-30-2007 04:49 PM |
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JohnMurga
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RE: removing/replacing widgets
Also, what is the purpose of creating "local object" and then setting "window" to the same value?
Err ... I was hacking the generated FLUID code (been playing with the converter), it makes NO sense ;-)
Cheers
JohnM
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| 06-30-2007 07:36 PM |
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