116 lines
3.9 KiB
Swift
116 lines
3.9 KiB
Swift
//
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// Copyright 2022 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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//
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import Foundation
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import UIKit
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open class OWSTableSheetViewController: InteractiveSheetViewController {
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open var tableViewController = OWSTableViewController2()
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open override var interactiveScrollViews: [UIScrollView] { [tableViewController.tableView] }
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open override var sheetBackgroundColor: UIColor {
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OWSTableViewController2.tableBackgroundColor(isUsingPresentedStyle: true, forceDarkMode: tableViewController.forceDarkMode)
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}
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open var bottomSafeAreaContentPadding: CGFloat {
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var padding = view.safeAreaInsets.bottom
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if padding == 0 {
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// For home button devices, add generous bottom padding
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// so it isn't right up on the edge.
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padding = 36
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} else {
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// For other devices, just add a touch extra.
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padding += 12
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}
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return padding
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}
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private var contentSizeHeight: CGFloat {
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let tableView = tableViewController.tableView
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// The `adjustedContentInset` property diverges from its stable value during
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// interactive dismiss operations. This causes weird drag/height jump behavior.
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// Instead, compute the height using `view.safeAreaInsets`, which remains stable
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// during animations. (Note that `.top` isn't considered here since
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// `maximumHeight` prevents the view's height from extending into top safe area.)
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return tableView.contentSize.height
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+ tableView.contentInset.totalHeight
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+ footerStack.frame.height
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+ bottomSafeAreaContentPadding
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}
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private var contentSizeObservation: NSKeyValueObservation?
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public init() {
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super.init()
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tableViewController.shouldDeferInitialLoad = false
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super.allowsExpansion = false
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contentSizeObservation = tableViewController.tableView.observe(\.contentSize, changeHandler: { [weak self] (_, _) in
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guard let self = self else { return }
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self.updateMinimizedHeight()
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})
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}
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public func updateMinimizedHeight() {
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self.minimizedHeight = self.contentSizeHeight
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}
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deinit {
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contentSizeObservation?.invalidate()
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}
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open var footerStack: UIStackView = {
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let view = UIStackView()
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view.axis = .vertical
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view.distribution = .fill
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view.alignment = .center
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view.preservesSuperviewLayoutMargins = true
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return view
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}()
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public override func viewDidLoad() {
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super.viewDidLoad()
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addChild(tableViewController)
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contentView.addSubview(tableViewController.view)
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contentView.addSubview(footerStack)
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tableViewController.view.autoPinEdgesToSuperviewEdges(with: .zero, excludingEdge: .bottom)
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footerStack.autoPinEdgesToSuperviewEdges(with: .zero, excludingEdge: .top)
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tableViewController.view.autoPinEdge(.bottom, to: .top, of: footerStack)
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minimizedHeight = contentSizeHeight
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updateViewState()
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}
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public override func viewDidLayoutSubviews() {
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super.viewDidLayoutSubviews()
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updateViewState()
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}
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private var previousMinimizedHeight: CGFloat?
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private var previousSafeAreaInsets: UIEdgeInsets?
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public func updateViewState() {
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if previousSafeAreaInsets != tableViewController.view.safeAreaInsets {
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updateTableContents()
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previousSafeAreaInsets = tableViewController.view.safeAreaInsets
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}
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// The table view might not have its final size when this method is called.
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// Run a layout pass so that we compute the correct height constraints.
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self.tableViewController.tableView.layoutIfNeeded()
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}
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public override func themeDidChange() {
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super.themeDidChange()
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updateTableContents()
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}
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open func updateTableContents(shouldReload: Bool = true) {
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}
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}
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