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scrollView.lua
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-- scrollView.lua
--
-- Version 1.0
--
-- Copyright (C) 2010 ANSCA Inc. All Rights Reserved.
--
-- Permission is hereby granted, free of charge, to any person obtaining a copy of
-- this software and associated documentation files (the "Software"), to deal in the
-- Software without restriction, including without limitation the rights to use, copy,
-- modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
-- and to permit persons to whom the Software is furnished to do so, subject to the
-- following conditions:
--
-- The above copyright notice and this permission notice shall be included in all copies
-- or substantial portions of the Software.
--
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
-- INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
-- PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
-- FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
-- DEALINGS IN THE SOFTWARE.
module(..., package.seeall)
-- set some global values for width and height of the screen
local screenW, screenH = display.contentWidth, display.contentHeight
local viewableScreenW, viewableScreenH = display.viewableContentWidth, display.viewableContentHeight
local screenOffsetW, screenOffsetH = display.contentWidth - display.viewableContentWidth, display.contentHeight - display.viewableContentHeight
local prevTime = 0
function new(params)
-- setup a group to be the scrolling screen
local scrollView = display.newGroup()
scrollView.top = params.top or 0
scrollView.bottom = params.bottom or 0
moved = 0
function scrollView:touch(event)
local phase = event.phase
print(phase)
--> Stop sound if dragging?
-- media.stopSound()
if( phase == "began" ) then
moved = 0
print(scrollView.y)
self.startPos = event.y
self.prevPos = event.y
self.delta, self.velocity = 0, 0
if self.tween then transition.cancel(self.tween) end
Runtime:removeEventListener("enterFrame", scrollView )
self.prevTime = 0
self.prevY = 0
transition.to(self.scrollBar, { time=200, alpha=1 } )
-- Start tracking velocity
Runtime:addEventListener("enterFrame", trackVelocity )
Runtime:removeEventListener("enterFrame", scrollView)
-- Subsequent touch events will target button even if they are outside the stageBounds of button
display.getCurrentStage():setFocus(self, event.id)
self.isFocus = true
elseif( self.isFocus ) then
if( phase == "moved" ) then
local bottomLimit = screenH - self.height - self.bottom
self.delta = event.y - self.prevPos
moved = moved + self.delta
self.prevPos = event.y
if ( self.y > self.top or self.y < bottomLimit ) then
self.y = self.y + self.delta/2
else
self.y = self.y + self.delta
end
-- scrollView:moveScrollBar()
elseif( phase == "ended") then
local dragDistance = event.y - self.startPos
self.lastTime = event.time
Runtime:addEventListener("enterFrame", scrollView)
Runtime:removeEventListener("enterFrame", trackVelocity)
if (moved < 10 and moved > -10) then
print("touch (" .. moved .. ")")
self.isFocus = false
display.getCurrentStage():setFocus(nil)
local c = 0
repeat
c = c + 1
if c > 1 then -- think element 1 might be container...?
if scrollView[c] and
event.x >= scrollView[c].contentBounds.xMin and
event.y >= scrollView[c].contentBounds.yMin and
event.x <= scrollView[c].contentBounds.xMax and
event.y <= scrollView[c].contentBounds.yMax then
print("=============\nscrollView: " .. c)
print ""
print "> touch x & y:"
print(" - " .. event.x)
print(" - " .. event.y)
print "> tile x & y:"
print(" - " .. scrollView[c].contentBounds.xMin)
print(" - " .. scrollView[c].contentBounds.yMin)
print(" - " .. scrollView[c].contentBounds.xMax)
print(" - " .. scrollView[c].contentBounds.yMax)
print "> print_r:"
-- util.print_r(scrollView[c])
-- scrollView[c].foreach(t, print)
if scrollView[c]._functionListeners then
scrollView[c]._functionListeners["touch"][1]({name=touch,phase='ended'})
end
end
end
until scrollView[c] == nil
else
print("end drag (" .. moved .. ")")
end
-- Allow touch events to be sent normally to the objects they "hit"
-- display.getCurrentStage():setFocus( nil )
-- self.isFocus = false
end
end
return true
end
function scrollView:enterFrame(event)
local friction = 0.9
local timePassed = event.time - self.lastTime
self.lastTime = self.lastTime + timePassed
--turn off scrolling if velocity is near zero
if math.abs(self.velocity) < .01 then
self.velocity = 0
Runtime:removeEventListener("enterFrame", scrollView )
transition.to(self.scrollBar, { time=400, alpha=0 } )
end
self.velocity = self.velocity*friction
self.y = math.floor(self.y + self.velocity*timePassed)
-- print("self.y")
-- print(self.y)
--
-- print("self.top")
-- print(self.top)
local upperLimit = self.top
local bottomLimit = self.bottom
-- local bottomLimit = screenH - self.height - self.bottom
if ( self.y > upperLimit ) then
self.velocity = 0
Runtime:removeEventListener("enterFrame", scrollView )
self.tween = transition.to(self, { time=400, y=upperLimit, transition=easing.outQuad})
transition.to(self.scrollBar, { time=400, alpha=0 } )
elseif ( self.y < bottomLimit and bottomLimit < 0 ) then
-- print "ABOVE AND BELOW"
self.velocity = 0
Runtime:removeEventListener("enterFrame", scrollView )
self.tween = transition.to(self, { time=400, y=bottomLimit, transition=easing.outQuad})
transition.to(self.scrollBar, { time=400, alpha=0 } )
elseif ( self.y < bottomLimit ) then
-- print "ABOVE"
self.velocity = 0
Runtime:removeEventListener("enterFrame", scrollView )
self.tween = transition.to(self, { time=400, y=upperLimit, transition=easing.outQuad})
transition.to(self.scrollBar, { time=400, alpha=0 } )
end
scrollView:moveScrollBar()
return true
end
function scrollView:moveScrollBar()
if self.scrollBar then
local scrollBar = self.scrollBar
scrollBar.y = -self.y*self.yRatio + scrollBar.height*0.5 + self.top
if scrollBar.y < 5 + self.top + scrollBar.height*0.5 then
scrollBar.y = 5 + self.top + scrollBar.height*0.5
end
if scrollBar.y > screenH - self.bottom - 5 - scrollBar.height*0.5 then
scrollBar.y = screenH - self.bottom - 5 - scrollBar.height*0.5
end
end
end
function trackVelocity(event)
local timePassed = event.time - scrollView.prevTime
scrollView.prevTime = scrollView.prevTime + timePassed
if scrollView.prevY then
scrollView.velocity = (scrollView.y - scrollView.prevY)/timePassed
end
scrollView.prevY = scrollView.y
end
scrollView.y = scrollView.top
-- setup the touch listener
scrollView:addEventListener( "touch", scrollView )
function scrollView:addScrollBar(r,g,b,a)
-- if self.scrollBar then self.scrollBar:removeSelf() end
--
-- local scrollColorR = r or 0
-- local scrollColorG = g or 0
-- local scrollColorB = b or 0
-- local scrollColorA = a or 120
--
-- local viewPortH = screenH - self.top - self.bottom
-- local scrollH = viewPortH*self.height/(self.height*2 - viewPortH)
-- local scrollBar = display.newRoundedRect(viewableScreenW-8,0,5,scrollH,2)
-- scrollBar:setFillColor(scrollColorR, scrollColorG, scrollColorB, scrollColorA)
--
-- local yRatio = scrollH/self.height
-- self.yRatio = yRatio
--
-- scrollBar.y = -self.y*self.yRatio + scrollBar.height*0.5 + self.top
--
-- self.scrollBar = scrollBar
--
-- transition.to(scrollBar, { time=400, alpha=0 } )
end
function scrollView:cleanUp()
Runtime:removeEventListener("enterFrame", trackVelocity)
Runtime:removeEventListener( "touch", scrollView )
Runtime:removeEventListener("enterFrame", scrollView )
if self.scrollBar then self.scrollBar:removeSelf() end
end
return scrollView
end