crystal.Overlay

A Container which aligns children relatively to itself. The desired size of an overlay is the size of its largest child. All children are positioned within this space according to their alignment preferences (in a corner, centered, stretched, etc.).

Children of an overlay have Basic Joints associated with them to adjust positioning preferences (padding, alignment, etc.).

Constructor

crystal.Overlay:new()

Examples

This example creates a progress bar with a background, a fill and a border:

local progress_bar = crystal.Overlay:new();

local background = progress_bar:add_child(crystal.Image:new());
background:set_image_size(80, 10);
background:set_color(crystal.Color.magenta_purple);

local fill = progress_bar:add_child(crystal.Image:new());
fill:set_alignment("left", "stretch");
fill:set_padding(1);
fill:set_image_size(60, 1);
fill:set_color(crystal.Color.bara_red);

local border = progress_bar:add_child(crystal.Image:new());
border:set_alignment("stretch", "stretch");
border:set_color(crystal.Color.white);