mirror of
https://github.com/vector-im/element-ios.git
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98 lines
3.7 KiB
Swift
98 lines
3.7 KiB
Swift
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//
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// Copyright 2020 Vector Creations Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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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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