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-- Class: TextInput
-- This is like a <Text> object, only it listens to user input and
-- adjusts its text property accordingly.
--
-- Extends:
-- <Text>
--
-- Events:
-- onChange - Occurs when the input's text has changed, either by a
-- user's input or programmtically.
-- onType - Occurs when the input is about to accept input from a key.
-- This event handler is passed the key about to be inserted.
-- If the handler returns false, *not* nil or any other value,
-- then the key is ignored.
TextInput = Text:extend{
text = '',
-- Property: listening
-- Whether the input is currently listening to input.
listening = true,
-- Property: caret
-- This shows the current insert position.
caret = 0,
-- Property: blinkRate
-- How quickly the caret blinks, in seconds.
blinkRate = 0.5,
-- internal property: _blinkTimer
-- Used to keep track of caret blinking.
_blinkTimer = 0,
-- internal property: _repeatKey
-- Used to keep track of what movement key is being held down.
-- internal property: _repeatTimer
-- Used to keep track of how quickly movement keys repeat.
-- internal property: _caretHeight
-- How tall the caret is onscreen, based on the font.
-- internal property: _caretX
-- Where to draw the caret, relative to the sprite's x position.
update = function (self, elapsed)
if self.listening then
-- listen to normal keys
if the.keys.typed ~= '' then
if (self.onType and self:onType(the.keys.typed)) or not self.onType then
self.text = string.sub(self.text, 1, self.caret) .. the.keys.typed
.. string.sub(self.text, self.caret + 1)
self.caret = self.caret + string.len(the.keys.typed)
end
end
if the.keys:justPressed('home') then
self.caret = 0
end
if the.keys:justPressed('end') then
self.caret = string.len(self.text)
end
-- handle movement keys that repeat
local frameAction
for _, key in pairs{'backspace', 'delete', 'left', 'right'} do
if the.keys:pressed(key) then
frameAction = key
if the.keys:alreadyHandled(key) then
frameAction = nil
end
end
end
if frameAction == 'backspace' and self.caret > 0 then
self.text = string.sub(self.text, 1, self.caret - 1) .. string.sub(self.text, self.caret + 1)
self.caret = self.caret - 1
end
if frameAction == 'delete' and self.caret < string.len(self.text) then
self.text = string.sub(self.text, 1, self.caret) .. string.sub(self.text, self.caret + 2)
end
if frameAction == 'left' and self.caret > 0 then
self.caret = self.caret - 1
end
if frameAction == 'right' and self.caret < string.len(self.text) then
self.caret = self.caret + 1
end
end
-- update caret position
if self._set.caret ~= self.caret and self._fontObj then
self._caretX = self._fontObj:getWidth(string.sub(self.text, 1, self.caret))
self._caretHeight = self._fontObj:getHeight()
self._set.caret = self.caret
end
-- update caret timer
self._blinkTimer = self._blinkTimer + elapsed
if self._blinkTimer > self.blinkRate * 2 then self._blinkTimer = 0 end
-- call onChange handler as needed
if self.text ~= self._set.text then
if self.onChange then self:onChange() end
self._set.text = self.text
end
Text.update(self, elapsed)
end,
draw = function (self, x, y)
if self.visible then
x = x or self.x
y = y or self.y
Text.draw(self, x, y)
-- draw caret
if (self._repeatKey or self._blinkTimer < self.blinkRate) and
(self._caretX and self._caretHeight) then
love.graphics.setLineWidth(1)
love.graphics.line(x + self._caretX, y, x + self._caretX, y + self._caretHeight)
end
end
end
}
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