## class fltk::InvisibleBox

### Class Hierarchy

    fltk::Widget
       |
       +----fltk::InvisibleBox

### Include Files

    #include <fltk/Box.h>

### Description

This widget is the same as an plain fltk::Widget except if the box is set to `fltk::NO_BOX` it is completely invisible and attemps to draw it do absolutely nothing. This can be used as the resizable() of a group or window to get more complex resize effects.

You can also set the box to provide decorations, but you can use the plain fltk::Widget for that, too.

### Methods

- fltk::InvisibleBox
- ~InvisibleBox

#### fltk::InvisibleBox::Box(int x, int y, int w, int h, const char * = 0)
fltk::InvisibleBox::Box(fltk::Box b, int x, int y, int w, int h, const char *)

The first constructor sets `box()` to `fltk::NO_BOX`, which means it is invisible. However such widgets are useful as placeholders or `fltk::Group::resizable()` values. To change the box to something visible, use `box(n)`.

The second form of the constructor sets the box to the specified box type.

#### fltk::InvisibleBox::~InvisibleBox(void)