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import ExpoModulesCore
class VisibilityView: ExpoView {
var enabled = false {
didSet {
if enabled {
VisibilityViewManager.shared.removeView(self)
}
}
}
private let onChangeStatus = EventDispatcher()
private var isCurrentlyActiveView = false
required init(appContext: AppContext? = nil) {
super.init(appContext: appContext)
}
public override func willMove(toWindow newWindow: UIWindow?) {
super.willMove(toWindow: newWindow)
if !self.enabled {
return
}
if newWindow == nil {
VisibilityViewManager.shared.removeView(self)
} else {
VisibilityViewManager.shared.addView(self)
}
}
func setIsCurrentlyActive(isActive: Bool) {
if isCurrentlyActiveView == isActive {
return
}
self.isCurrentlyActiveView = isActive
self.onChangeStatus([
"isActive": isActive
])
}
}
// 🚨 DANGER 🚨
// These functions need to be called from the main thread. Xcode will warn you if you call one of them
// off the main thread, so pay attention!
extension UIView {
func getPositionOnScreen() -> CGRect? {
if let window = self.window {
return self.convert(self.bounds, to: window)
}
return nil
}
func isViewableEnough() -> Bool {
guard let window = self.window else {
return false
}
let viewFrameOnScreen = self.convert(self.bounds, to: window)
let screenBounds = window.bounds
let intersection = viewFrameOnScreen.intersection(screenBounds)
let viewHeight = viewFrameOnScreen.height
let intersectionHeight = intersection.height
return intersectionHeight >= 0.5 * viewHeight
}
}
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