-- Keyboard driver
Modifiers = {'lctrl', 'rctrl', 'lalt', 'ralt', 'lshift', 'rshift', 'lgui', 'rgui'}
function App.keypressed(key, scancode, isrepeat)
if array.find(Modifiers, key) then
-- do nothing when the modifier is pressed
return
end
-- include the modifier(s) when the non-modifer is pressed
App.keychord_press(App.combine_modifiers(key), key)
end
function App.combine_modifiers(key)
local result = ''
if App.ctrl_down() then
result = result..'C-'
end
if App.alt_down() then
result = result..'M-'
end
if App.shift_down() then
result = result..'S-' -- don't try to use this with letters/digits
end
if App.cmd_down() then
result = result..'s-'
end
result = result..key
return result
end
function App.any_modifier_down()
return App.ctrl_down() or App.alt_down() or App.shift_down() or App.cmd_down()
end
function App.ctrl_down()
return App.modifier_down('lctrl') or App.modifier_down('rctrl')
end
function App.alt_down()
return App.modifier_down('lalt') or App.modifier_down('ralt')
end
function App.shift_down()
return App.modifier_down('lshift') or App.modifier_down('rshift')
end
function App.cmd_down()
return App.modifier_down('lgui') or App.modifier_down('rgui')
end
function App.is_cursor_movement(key)
return array.find({'left', 'right', 'up', 'down', 'home', 'end', 'pageup', 'pagedown'}, key)
end
array = {}
function array.find(arr, elem)
if type(elem) == 'function' then
for i,x in ipairs(arr) do
if elem(x) then
return i
end
end
else
for i,x in ipairs(arr) do
if x == elem then
return i
end
end
end
return nil
end
function array.any(arr, f)
for i,x in ipairs(arr) do
local result = f(x)
if result then
return result
end
end
return false
end