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Add opacity effect like Instagram Stories. #1

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Add opacity effect like Instagram Stories. #1

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12 changes: 11 additions & 1 deletion Pagination/PaginationView.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -71,6 +71,14 @@ struct PaginationView <Content, Pages> : View where Content: View, Pages: Random
return 0
}

func getOpacity(position : CGFloat, width: CGFloat) -> Double {
let pos = position + (self.translation?.width ?? 0)
if (pos != 0 ) {
return (1.0 - (abs(pos)/width))
}
return 1
}

func getAnchor(position : CGFloat, width: CGFloat) -> UnitPoint {
let pos = position + self.lastTranslation
if(isLeftSided(position: pos, width: width)) {
Expand All @@ -91,7 +99,9 @@ struct PaginationView <Content, Pages> : View where Content: View, Pages: Random
private func bodyHelper(containerSize: CGSize, offsets: [Pages.Element.ID: (position: CGFloat, rotation: CGFloat)]) -> some View {
ZStack {
ForEach(self.pages){
self.content($0).rotation3DEffect(.degrees(self.getRotation(position: (offsets[$0.id]?.position ?? 0) + self.initPosition, width: containerSize.width )), axis: (x: 0, y: 1, z: 0), anchor: self.getAnchor(position: (offsets[$0.id]?.position ?? 0) + self.initPosition, width: containerSize.width))
self.content($0)
.opacity(self.getOpacity(position: (offsets[$0.id]?.position ?? 0) + self.initPosition, width: containerSize.width ))
.rotation3DEffect(.degrees(self.getRotation(position: (offsets[$0.id]?.position ?? 0) + self.initPosition, width: containerSize.width )), axis: (x: 0, y: 1, z: 0), anchor: self.getAnchor(position: (offsets[$0.id]?.position ?? 0) + self.initPosition, width: containerSize.width))
.offset(x: (offsets[$0.id]?.position ?? 0 ) + (self.translation?.width ?? 0) + self.initPosition )
.gesture(DragGesture()
.onChanged({ (value) in
Expand Down