mirror of
https://github.com/vector-im/element-ios.git
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74 lines
2.2 KiB
Swift
74 lines
2.2 KiB
Swift
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//
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// Copyright 2021 New Vector 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 UIKit
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class ResponderManager {
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private static var tagIndex: Int = 1000
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private static var registeredResponders = NSMapTable<NSNumber, UIView>(keyOptions: .strongMemory, valueOptions: .weakMemory)
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private static var nextIndex: Int {
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tagIndex += 1
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return tagIndex
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}
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private static var firstResponder: UIView? {
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guard let enumerator = registeredResponders.objectEnumerator() else {
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return nil
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}
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while let view: UIView = enumerator.nextObject() as? UIView {
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if view.isFirstResponder {
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return view
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}
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}
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return nil
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}
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static func register(view: UIView) {
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view.tag = nextIndex
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registeredResponders.setObject(view, forKey: NSNumber(value: view.tag))
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}
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static func unregister(view: UIView) {
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registeredResponders.removeObject(forKey: NSNumber(value: view.tag))
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}
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static func makeActiveNextResponder() -> Bool {
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guard let firstResponder = self.firstResponder else {
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return false
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}
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return makeActiveNextResponder(of: firstResponder)
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}
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static func makeActiveNextResponder(of view: UIView) -> Bool {
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let nextTag = view.tag + 1
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guard let nextResponder = registeredResponders.object(forKey: NSNumber(value: nextTag)) else {
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return false
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}
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nextResponder.becomeFirstResponder()
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return true
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}
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static func resignFirstResponder() {
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firstResponder?.resignFirstResponder()
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}
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}
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