//
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// IQScrollViewConfiguration.swift
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// https://github.com/hackiftekhar/IQKeyboardManager
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// Copyright (c) 2013-24 Iftekhar Qurashi.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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import UIKit
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@available(iOSApplicationExtension, unavailable)
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@MainActor
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internal struct IQScrollViewConfiguration {
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let scrollView: UIScrollView
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let startingContentOffset: CGPoint
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let startingScrollIndicatorInsets: UIEdgeInsets
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let startingContentInset: UIEdgeInsets
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private let canRestoreContentOffset: Bool
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init(scrollView: UIScrollView, canRestoreContentOffset: Bool) {
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self.scrollView = scrollView
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self.canRestoreContentOffset = canRestoreContentOffset
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startingContentOffset = scrollView.contentOffset
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startingContentInset = scrollView.contentInset
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startingScrollIndicatorInsets = scrollView.verticalScrollIndicatorInsets
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}
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var hasChanged: Bool {
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if scrollView.contentInset != self.startingContentInset {
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return true
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}
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if canRestoreContentOffset,
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scrollView.iq.restoreContentOffset,
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!scrollView.contentOffset.equalTo(startingContentOffset) {
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return true
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}
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return false
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}
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@discardableResult
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func restore(for textFieldView: UIView?) -> Bool {
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var success: Bool = false
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if scrollView.contentInset != self.startingContentInset {
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scrollView.contentInset = self.startingContentInset
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scrollView.layoutIfNeeded() // (Bug ID: #1996)
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success = true
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}
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if scrollView.verticalScrollIndicatorInsets != self.startingScrollIndicatorInsets {
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scrollView.verticalScrollIndicatorInsets = self.startingScrollIndicatorInsets
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}
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if canRestoreContentOffset,
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scrollView.iq.restoreContentOffset,
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!scrollView.contentOffset.equalTo(startingContentOffset) {
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// (Bug ID: #1365, #1508, #1541)
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let stackView: UIStackView? = textFieldView?.iq.superviewOf(type: UIStackView.self,
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belowView: scrollView)
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// (Bug ID: #1901, #1996)
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let animatedContentOffset: Bool = stackView != nil ||
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scrollView is UICollectionView ||
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scrollView is UITableView
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if animatedContentOffset {
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scrollView.setContentOffset(startingContentOffset, animated: UIView.areAnimationsEnabled)
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} else {
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scrollView.contentOffset = startingContentOffset
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}
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success = true
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}
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return success
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}
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}
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