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InfiniteScrollView using C4
// Copyright © 2016 C4
//
// 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.
import UIKit
import Foundation
public class InfiniteScrollView: UIScrollView {
public override func layoutSubviews() {
super.layoutSubviews()
//grab the current content offset (top-left corner)
var curr = contentOffset
//if the x value is less than zero
if curr.x < 0 {
//update x to the end of the scrollview
curr.x = contentSize.width - frame.width
//set the content offset for the view
contentOffset = curr
}
//if the x value is greater than the width - frame width
//(i.e. when the top-right point goes beyond contentSize.width)
else if curr.x >= contentSize.width - frame.width {
//update x to the beginning of the scrollview
curr.x = 0
//set the content offset for the view
contentOffset = curr
}
}
}
// Copyright © 2015 C4
//
// 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.
import UIKit
class WorkSpace: CanvasController {
let infiniteScrollView = InfiniteScrollView() //create a new InfiniteScrollview object
override func setup() {
//creates CGRect from canvas frame
//sets frame of infiniteScrollView to match canvas
infiniteScrollView.frame = CGRect(canvas.frame)
//add the view to the canvas
canvas.add(infiniteScrollView)
addVisualIndicators()
}
func addVisualIndicators() {
//the max number of indicators
let count = 20
//the gap between indicators
let gap = 150.0
//initial offset because we're positioning from the center of each indicator's view
let dx = 40.0
//the calculated total width of the view's contentSize
let width = Double(count + 1) * gap + dx
//create main indicators
for x in 0...count {
//create a center point for the new indicator
let point = Point(Double(x) * gap + dx, canvas.center.y)
//create a new indicator
createIndicator("\(x)", at: point)
}
//create additional indicators
var x : Int = 0
//create an offset variable
var offset = dx
//The total width (including the last "view" of the infiniteScrollView is based on the width + screen width
//So, the total width and count of how many "extra" indicators to add is somewhat arbitrary
//This is why we use a while loop
//while the offset is less than the view's width
while offset < Double(infiniteScrollView.frame.size.width) {
//create a center point whose x value starts is the total width + the current offset
let point = Point(width + offset, canvas.center.y)
//create the width
createIndicator("\(x)", at: point)
//increase the offset for the next point
offset += gap
//increate x to be used as the variable for the next indicator's number
x++
}
//update infiniteScrollView contentSize
infiniteScrollView.contentSize = CGSizeMake(CGFloat(width) + infiniteScrollView.frame.size.width, 0)
}
func createIndicator(text: String, at point: Point) {
//create a textshape
let ts = TextShape(text: text)!
//center the shape
ts.center = point
//add it to the canvas
infiniteScrollView.add(ts)
}
}
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