90 lines
3.3 KiB
Swift
90 lines
3.3 KiB
Swift
//
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// Copyright 2024 New Vector Ltd.
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// Copyright 2020 Vector Creations Ltd
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//
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// SPDX-License-Identifier: AGPL-3.0-only
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// Please see LICENSE in the repository root for full details.
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//
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import Foundation
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@objc
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protocol TableViewSectionsDelegate {
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func tableViewSectionsDidUpdateSections(_ sections: TableViewSections)
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}
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@objcMembers
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final class TableViewSections: NSObject {
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/// Delegate object
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weak var delegate: TableViewSectionsDelegate?
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/// Sections. Updating this will trigger `tableViewSectionsDidUpdateSections` of the delegate object.
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var sections: [Section] = [] {
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didSet {
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delegate?.tableViewSectionsDidUpdateSections(self)
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}
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}
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/// Finds the exact indexpath for the given row and section tag. If cannot find, returns nil
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/// - Parameters:
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/// - rowTag: Tag for row
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/// - sectionTag: Tag for section
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/// - Returns: IndexPath object if found, otherwise nil.
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func exactIndexPath(forRowTag rowTag: Int, sectionTag: Int) -> IndexPath? {
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guard let sectionIndex = sections.firstIndex(where: { $0.tag == sectionTag }) else {
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return nil
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}
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guard let indexOfRow = sections[sectionIndex].indexOfRow(withTag: rowTag) else {
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return nil
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}
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return IndexPath(row: indexOfRow, section: sectionIndex)
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}
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/// Finds the nearest next indexPath for given row tag and section tag. If the section finishes, also checks for the next section. If cannot find any row available, returns nil.
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/// - Parameters:
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/// - rowTag: Tag for row
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/// - sectionTag: Tag for section
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/// - Returns: IndexPath object if found, otherwise nil.
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func nearestIndexPath(forRowTag rowTag: Int, sectionTag: Int) -> IndexPath? {
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let sectionIndex = sections.firstIndex(where: { $0.tag == sectionTag })
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if let sectionIndex = sectionIndex {
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if let indexOfRow = sections[sectionIndex].indexOfRow(withTag: rowTag) {
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return IndexPath(row: indexOfRow, section: sectionIndex)
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} else if rowTag + 1 < sections[sectionIndex].rows.count {
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return nearestIndexPath(forRowTag: rowTag + 1, sectionTag: sectionTag)
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} else if sectionTag + 1 < sections.count {
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return nearestIndexPath(forRowTag: 0, sectionTag: sectionTag + 1)
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}
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} else if sectionTag + 1 < sections.count {
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// try to return the first row of the next section
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return nearestIndexPath(forRowTag: 0, sectionTag: sectionTag + 1)
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}
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return nil
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}
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/// Section at index.
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/// - Parameter index: Index of desired section
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/// - Returns: Section object if index is in bounds of the sections array. Otherwise nil.
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func section(atIndex index: Int) -> Section? {
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if index < sections.count {
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return sections[index]
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}
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return nil
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}
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func tagsIndexPath(fromTableViewIndexPath indexPath: IndexPath) -> IndexPath? {
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guard let section = section(atIndex: indexPath.section) else {
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// section not found
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return nil
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}
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guard indexPath.row < section.rows.count else {
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return nil
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}
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return IndexPath(row: section.rows[indexPath.row].tag, section: section.tag)
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}
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}
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