bzr branch
http://9ix.org/bzr/ld28
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1
by Josh C
zoetrope 1.4 |
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-- Class: TextInput |
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-- This is like a <Text> object, only it listens to user input and |
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-- adjusts its text property accordingly. |
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-- |
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-- Extends: |
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-- <Text> |
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-- |
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-- Events: |
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-- onChange - Occurs when the input's text has changed, either by a |
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-- user's input or programmtically. |
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-- onType - Occurs when the input is about to accept input from a key. |
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-- This event handler is passed the key about to be inserted. |
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-- If the handler returns false, *not* nil or any other value, |
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-- then the key is ignored. |
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TextInput = Text:extend{
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text = '', |
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-- Property: listening |
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-- Whether the input is currently listening to input. |
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listening = true, |
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-- Property: caret |
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-- This shows the current insert position. |
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caret = 0, |
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-- Property: blinkRate |
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-- How quickly the caret blinks, in seconds. |
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blinkRate = 0.5, |
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-- internal property: _blinkTimer |
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-- Used to keep track of caret blinking. |
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_blinkTimer = 0, |
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-- internal property: _repeatKey |
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-- Used to keep track of what movement key is being held down. |
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-- internal property: _repeatTimer |
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-- Used to keep track of how quickly movement keys repeat. |
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-- internal property: _caretHeight |
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-- How tall the caret is onscreen, based on the font. |
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-- internal property: _caretX |
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-- Where to draw the caret, relative to the sprite's x position. |
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update = function (self, elapsed) |
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if self.listening then |
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-- listen to normal keys |
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if the.keys.typed ~= '' then |
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if (self.onType and self:onType(the.keys.typed)) or not self.onType then |
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self.text = string.sub(self.text, 1, self.caret) .. the.keys.typed |
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.. string.sub(self.text, self.caret + 1) |
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self.caret = self.caret + string.len(the.keys.typed) |
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end |
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end |
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if the.keys:justPressed('home') then
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self.caret = 0 |
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end |
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if the.keys:justPressed('end') then
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self.caret = string.len(self.text) |
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end |
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-- handle movement keys that repeat |
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-- we have to simulate repeat rates manually :( |
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local delay, rate = love.keyboard.getKeyRepeat() |
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local frameAction |
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for _, key in pairs{'backspace', 'delete', 'left', 'right'} do
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if the.keys:pressed(key) then |
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if self._repeatKey == key then |
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self._repeatTimer = self._repeatTimer + elapsed |
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-- if we've made it past the maximum delay, then |
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-- we reset the timer and take action |
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if self._repeatTimer > delay + rate then |
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self._repeatTimer = delay |
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frameAction = key |
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end |
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else |
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-- we've just started holding down the key |
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self._repeatKey = key |
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self._repeatTimer = 0 |
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frameAction = key |
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end |
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else |
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if self._repeatKey == key then |
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self._repeatKey = nil |
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end |
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end |
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end |
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if frameAction == 'backspace' and self.caret > 0 then |
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self.text = string.sub(self.text, 1, self.caret - 1) .. string.sub(self.text, self.caret + 1) |
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self.caret = self.caret - 1 |
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end |
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if frameAction == 'delete' and self.caret < string.len(self.text) then |
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self.text = string.sub(self.text, 1, self.caret) .. string.sub(self.text, self.caret + 2) |
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end |
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if frameAction == 'left' and self.caret > 0 then |
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self.caret = self.caret - 1 |
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end |
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if frameAction == 'right' and self.caret < string.len(self.text) then |
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self.caret = self.caret + 1 |
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end |
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end |
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-- update caret position |
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if self._set.caret ~= self.caret and self._fontObj then |
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self._caretX = self._fontObj:getWidth(string.sub(self.text, 1, self.caret)) |
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self._caretHeight = self._fontObj:getHeight() |
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self._set.caret = self.caret |
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end |
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-- update caret timer |
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self._blinkTimer = self._blinkTimer + elapsed |
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if self._blinkTimer > self.blinkRate * 2 then self._blinkTimer = 0 end |
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-- call onChange handler as needed |
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if self.text ~= self._set.text then |
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if self.onChange then self:onChange() end |
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self._set.text = self.text |
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end |
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Text.update(self, elapsed) |
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end, |
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draw = function (self, x, y) |
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if self.visible then |
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x = x or self.x |
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y = y or self.y |
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Text.draw(self, x, y) |
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-- draw caret |
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if (self._repeatKey or self._blinkTimer < self.blinkRate) and |
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(self._caretX and self._caretHeight) then |
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love.graphics.setLineWidth(1) |
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love.graphics.line(x + self._caretX, y, x + self._caretX, y + self._caretHeight) |
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end |
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end |
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end |
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} |