RE: [fltk.general] bug? Fl_Group::color requires a box style. [General Use]

[MacArthur, Ian (Leonardo, UK)]

> Fl_Group *group1 = new Fl_Group(10,35,200,200,"group1");
> group1->box(FL_BORDER_BOX);

> Fl_Button *b1 = new Fl_Button(201, 10,90,25,"Button A1");
> Fl_Button *b2 = new Fl_Button(50, 90,90,25,"Button A2");
> Fl_Button *b3 = new Fl_Button(50,120,90,25,"Button A3");

> group1->end();
> group1->color(0xff000000);

> In order for group1 to display as red, it also needs FL_BORDER_BOX set. I
> would have thought you could have a red group box without any border?


In order for the group to have a colour, it needs to have a box type set, but not necessarily FL_BORDER_BOX.
I expect that what you want is probably FL_FLAT_BOX in this case.

Note that the default box type for a group is FL_NO_BOX, which does not draw anything at all, and hence can not show any colour. This is because a group is very often just a container for other widgets and does not need to be drawn at all itself.

A group can also be set to a FRAME type, but again that would not show your colour, since it only draws the frame of the group but not the background (again because it is assumed that a group is only there to hold other widgets and will have no specific drawing needs.)



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[Spacen]

On Thursday, 11 August 2016 17:43:34 UTC+1, MacArthur, Ian (Leonardo, UK) wrote:

>     Fl_Group *group1 = new Fl_Group(10,35,200,200,"group1");
>     group1->box(FL_BORDER_BOX);

>     Fl_Button *b1 = new Fl_Button(201, 10,90,25,"Button A1");
>     Fl_Button *b2 = new Fl_Button(50, 90,90,25,"Button A2");
>     Fl_Button *b3 = new Fl_Button(50,120,90,25,"Button A3");

>     group1->end();
>     group1->color(0xff000000);

> In order for group1 to display as red, it also needs FL_BORDER_BOX set. I
> would have thought you could have a red group box without any border?


In order for the group to have a colour, it needs to have a box type set, but not necessarily FL_BORDER_BOX.
I expect that what you want is probably FL_FLAT_BOX in this case.

Note that the default box type for a group is FL_NO_BOX, which does not draw anything at all, and hence can not show any colour. This is because a group is very often just a container for other widgets and does not need to be drawn at all itself.

A group can also be set to a FRAME type, but again that would not show your colour, since it only draws the frame of the group but not the background (again because it is assumed that a group is only there to hold other widgets and will have no specific drawing needs.)

Yes I understand, thank you.