hi i’m trying to move a display group who contains a lot of display.newImage and to drag items who are in the
group on the scene
but if scroll the display group i can’t drag items , and if i drag items on the scene i can’t scroll the group,
if i do one i can’t do the other and i want to do both, need help plz
How big are the images, do they cover the entirety of the scrollView or are there large gaps between?
If there are large gaps, you can set focus on the touched object in event.phase == “began” to prevent the scrollView from responding to the touch event, remembering to set focus to nil on event.phase == “ended”. The user can then scroll the view by moving their finger on an area not containing an image.
[lua]
display.getCurrentStage():setFocus( event. target )
[/lua]
If the images take up most of the scrollVIew, you could detect how long the user holds their finger on an object - after a certain amount of time set the focus on the object as above.
As for dragging objects around, I’ve been using the excellent DMC dragdrop library lately for this task.
https://github.com/dmccuskey/DMC-Corona-Library/tree/master/examples/dmc_dragdrop/DMC-dragdrop-basic
http://docs.davidmccuskey.com/display/docs/Quick+Guide±+dmc_dragdrop
there are large gaps between images
local function onRectangleTouch(event)
local t = event.target
if event.phase == “began” then
if (event.target ~= nil) then
clik = 1
local parent = t.parent
parent:insert(t)
display.getCurrentStage():setFocus(t)
t.isFocus = true
t.markX = event.xStart
t.markY = event.yStart
screenGroup:insert(t)
end
elseif event.phase == “moved” then
if (clik ~= 0) then
t.x = (event.x - event.xStart) + t.markX
t.y = (event.y - event.yStart) + t.markY
end
elseif event.phase == “ended” then
display.getCurrentStage():setFocus(nil)
t.isFocus = False
clik = 0
end
return true
end
local function createimage()
local group = display.newGroup( )
local position = 0
for i = 1, #elements do
local image = display.newImageRect(elements[i].img, elements[i].dir or CONTENT_DIR, 100, 100)
image.x = 125 + position
image.y = 100
position = position + 120
image:addEventListener( “touch”, onRectangleTouch )
group:insert(image)
end
return group
end
groupdisplay:insert(createimage())
groupdisplay:addEventListener(“touch”, groupdisplay) i don’t know how to do both i don’t have a scrollview widget it’s a group.display
thank you for these links I’ll watch
it’s too complicated compared to what I want to do I’ll try another way
hey can it be possible to clone a display object?
for example i have an display object
and when i click on it i duplicate the display object so i can move his clone and the original stay at his position
When you first create the object, you need to store information about it, such as the filename, directory used etc
i.e.
[lua]
local image = display.newImageRect(elements[i].img, elements[i].dir or CONTENT_DIR, 100, 100)
image.file = elements[i].img
image.dir = elements[i].dir
[/lua]
Then when you click on it:
[lua]
local t = event.target
local image = display.newImageRect(t.file, t.dir, t.width, t.height)
image.x, image.y = t.x, t.y
[/lua]
thanks it works but i can’t move the clone,
in event.phase == “moved”
what should i do? i tried image.x, image.y = event.x,event.y but it doesn’t work
How big are the images, do they cover the entirety of the scrollView or are there large gaps between?
If there are large gaps, you can set focus on the touched object in event.phase == “began” to prevent the scrollView from responding to the touch event, remembering to set focus to nil on event.phase == “ended”. The user can then scroll the view by moving their finger on an area not containing an image.
[lua]
display.getCurrentStage():setFocus( event. target )
[/lua]
If the images take up most of the scrollVIew, you could detect how long the user holds their finger on an object - after a certain amount of time set the focus on the object as above.
As for dragging objects around, I’ve been using the excellent DMC dragdrop library lately for this task.
https://github.com/dmccuskey/DMC-Corona-Library/tree/master/examples/dmc_dragdrop/DMC-dragdrop-basic
http://docs.davidmccuskey.com/display/docs/Quick+Guide±+dmc_dragdrop
there are large gaps between images
local function onRectangleTouch(event)
local t = event.target
if event.phase == “began” then
if (event.target ~= nil) then
clik = 1
local parent = t.parent
parent:insert(t)
display.getCurrentStage():setFocus(t)
t.isFocus = true
t.markX = event.xStart
t.markY = event.yStart
screenGroup:insert(t)
end
elseif event.phase == “moved” then
if (clik ~= 0) then
t.x = (event.x - event.xStart) + t.markX
t.y = (event.y - event.yStart) + t.markY
end
elseif event.phase == “ended” then
display.getCurrentStage():setFocus(nil)
t.isFocus = False
clik = 0
end
return true
end
local function createimage()
local group = display.newGroup( )
local position = 0
for i = 1, #elements do
local image = display.newImageRect(elements[i].img, elements[i].dir or CONTENT_DIR, 100, 100)
image.x = 125 + position
image.y = 100
position = position + 120
image:addEventListener( “touch”, onRectangleTouch )
group:insert(image)
end
return group
end
groupdisplay:insert(createimage())
groupdisplay:addEventListener(“touch”, groupdisplay) i don’t know how to do both i don’t have a scrollview widget it’s a group.display
thank you for these links I’ll watch
it’s too complicated compared to what I want to do I’ll try another way
hey can it be possible to clone a display object?
for example i have an display object
and when i click on it i duplicate the display object so i can move his clone and the original stay at his position
When you first create the object, you need to store information about it, such as the filename, directory used etc
i.e.
[lua]
local image = display.newImageRect(elements[i].img, elements[i].dir or CONTENT_DIR, 100, 100)
image.file = elements[i].img
image.dir = elements[i].dir
[/lua]
Then when you click on it:
[lua]
local t = event.target
local image = display.newImageRect(t.file, t.dir, t.width, t.height)
image.x, image.y = t.x, t.y
[/lua]
thanks it works but i can’t move the clone,
in event.phase == “moved”
what should i do? i tried image.x, image.y = event.x,event.y but it doesn’t work