crystal.Widget

A Wrapper which manages a Script. This is a good base class to inherit from when implementing UI components that need animation or other time-based logic.

The child of a Widget has a Basic Joint to adjust positioning preferences (padding, alignment, etc.).

Constructor

crystal.Widget:new()

Methods

Name	Description
script	Returns the script managed by this widget.

Examples

This example implements a widget which can make an image pulsate over time.

local FlashingImage = Class("FlashingImage", crystal.Widget);

FlashingImage.init = function(self, texture)
  FlashingImage.super.init(self);
  self.image = self:set_child(crystal.Image:new(texture));
  self.pulsating = false;
end

FlashingImage.begin_pulse = function(self)
  if not self.pulsating then
    local image = self.image;
    self:script():run_thread(function(self)
      while true do
        image:set_opacity(math.cos(self:time()));
        self:wait_frame();
      end
    end);
  end
end

FlashingImage.end_pulse = function(self)
  self:script():stop_all_threads();
  self.image:set_opacity(1);
end