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23a1e5b Nov 30, 2011
Gideros Mobile added more comments
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--[[
A generic button class
This code is MIT licensed, see http://www.opensource.org/licenses/mit-license.php
(C) 2010 - 2011 Gideros Mobile
]]
Button = gideros.class(Sprite)
function Button:init(upState, downState)
self.upState = upState
self.downState = downState
self.focus = false
-- set the visual state as "up"
self:updateVisualState(false)
-- register to all mouse and touch events
self:addEventListener(Event.MOUSE_DOWN, self.onMouseDown, self)
self:addEventListener(Event.MOUSE_MOVE, self.onMouseMove, self)
self:addEventListener(Event.MOUSE_UP, self.onMouseUp, self)
self:addEventListener(Event.TOUCHES_BEGIN, self.onTouchesBegin, self)
self:addEventListener(Event.TOUCHES_MOVE, self.onTouchesMove, self)
self:addEventListener(Event.TOUCHES_END, self.onTouchesEnd, self)
self:addEventListener(Event.TOUCHES_CANCEL, self.onTouchesCancel, self)
end
function Button:onMouseDown(event)
if self:hitTestPoint(event.x, event.y) then
self.focus = true
self:updateVisualState(true)
event:stopPropagation()
end
end
function Button:onMouseMove(event)
if self.focus then
if not self:hitTestPoint(event.x, event.y) then
self.focus = false
self:updateVisualState(false)
end
event:stopPropagation()
end
end
function Button:onMouseUp(event)
if self.focus then
self.focus = false
self:updateVisualState(false)
self:dispatchEvent(Event.new("click")) -- button is clicked, dispatch "click" event
event:stopPropagation()
end
end
-- if button is on focus, stop propagation of touch events
function Button:onTouchesBegin(event)
if self.focus then
event:stopPropagation()
end
end
-- if button is on focus, stop propagation of touch events
function Button:onTouchesMove(event)
if self.focus then
event:stopPropagation()
end
end
-- if button is on focus, stop propagation of touch events
function Button:onTouchesEnd(event)
if self.focus then
event:stopPropagation()
end
end
-- if touches are cancelled, reset the state of the button
function Button:onTouchesCancel(event)
if self.focus then
self.focus = false;
self:updateVisualState(false)
event:stopPropagation()
end
end
-- if state is true show downState else show upState
function Button:updateVisualState(state)
if state then
if self:contains(self.upState) then
self:removeChild(self.upState)
end
if not self:contains(self.downState) then
self:addChild(self.downState)
end
else
if self:contains(self.downState) then
self:removeChild(self.downState)
end
if not self:contains(self.upState) then
self:addChild(self.upState)
end
end
end