keyboard.fluid

--[[
A basic demonstration of receiving keyboard input from a viewport.
--]]

   require 'gui/window'

   local win = gui.window({ title='Keyboard Example', insideWidth=400, insideHeight=200,
      maxWidth=600, maxHeight=300, minWidth=400, minHeight=200 })

   local viewport = win:clientViewport({ aspectRatio = ARF_MEET })

   local text = viewport.new('VectorText', {
      string='Press a key', face='Noto Sans', fontSize=60, y=50, x=10, fill='rgb(0,0,0)'
   })

   -- Create a keyboard subscription to the window's main viewport.  The applied function will be called every time
   -- that the user presses a key when the window has the focus.

   viewport.mtSubscribeKeyboard(function(Viewport, Flags, Value, Unicode)
      if (Unicode > 0) then
         glChars = nz(glChars,'') .. string.char(Unicode)
         glChars = glChars:sub(-10)
      end

      text.string = 'Flags: ' .. string.format('0x%x', Flags) .. '\nCode: ' .. Value .. '\n' .. glChars
      viewport.acDraw()
   end)

   win:show()
   processing.sleep()