122 lines
5.7 KiB
Swift
122 lines
5.7 KiB
Swift
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final class ExpandingAttachmentsButton : UIView, InputViewButtonDelegate {
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private let delegate: ExpandingAttachmentsButtonDelegate
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private var isExpanded = false { didSet { expandOrCollapse() } }
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// MARK: Constraints
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private lazy var gifButtonContainerBottomConstraint = gifButtonContainer.pin(.bottom, to: .bottom, of: self)
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private lazy var documentButtonContainerBottomConstraint = documentButtonContainer.pin(.bottom, to: .bottom, of: self)
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private lazy var libraryButtonContainerBottomConstraint = libraryButtonContainer.pin(.bottom, to: .bottom, of: self)
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private lazy var cameraButtonContainerBottomConstraint = cameraButtonContainer.pin(.bottom, to: .bottom, of: self)
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// MARK: UI Components
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lazy var gifButton = InputViewButton(icon: #imageLiteral(resourceName: "actionsheet_gif_black"), delegate: self, hasOpaqueBackground: true)
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lazy var gifButtonContainer = container(for: gifButton)
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lazy var documentButton = InputViewButton(icon: #imageLiteral(resourceName: "actionsheet_document_black"), delegate: self, hasOpaqueBackground: true)
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lazy var documentButtonContainer = container(for: documentButton)
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lazy var libraryButton = InputViewButton(icon: #imageLiteral(resourceName: "actionsheet_camera_roll_black"), delegate: self, hasOpaqueBackground: true)
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lazy var libraryButtonContainer = container(for: libraryButton)
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lazy var cameraButton = InputViewButton(icon: #imageLiteral(resourceName: "actionsheet_camera_black"), delegate: self, hasOpaqueBackground: true)
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lazy var cameraButtonContainer = container(for: cameraButton)
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lazy var mainButton = InputViewButton(icon: #imageLiteral(resourceName: "ic_plus_24"), delegate: self)
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lazy var mainButtonContainer = container(for: mainButton)
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// MARK: Lifecycle
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init(delegate: ExpandingAttachmentsButtonDelegate) {
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self.delegate = delegate
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super.init(frame: CGRect.zero)
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setUpViewHierarchy()
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}
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override init(frame: CGRect) {
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preconditionFailure("Use init(delegate:) instead.")
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}
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required init?(coder: NSCoder) {
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preconditionFailure("Use init(delegate:) instead.")
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}
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private func setUpViewHierarchy() {
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backgroundColor = .clear
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// GIF button
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addSubview(gifButtonContainer)
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gifButtonContainer.alpha = 0
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// Document button
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addSubview(documentButtonContainer)
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documentButtonContainer.alpha = 0
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// Library button
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addSubview(libraryButtonContainer)
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libraryButtonContainer.alpha = 0
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// Camera button
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addSubview(cameraButtonContainer)
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cameraButtonContainer.alpha = 0
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// Main button
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addSubview(mainButtonContainer)
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// Constraints
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mainButtonContainer.pin(to: self)
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gifButtonContainer.center(.horizontal, in: self)
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documentButtonContainer.center(.horizontal, in: self)
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libraryButtonContainer.center(.horizontal, in: self)
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cameraButtonContainer.center(.horizontal, in: self)
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[ gifButtonContainerBottomConstraint, documentButtonContainerBottomConstraint, libraryButtonContainerBottomConstraint, cameraButtonContainerBottomConstraint ].forEach {
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$0.isActive = true
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}
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}
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// MARK: Animation
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private func expandOrCollapse() {
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if isExpanded {
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let expandedButtonSize = InputViewButton.expandedSize
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let spacing: CGFloat = 4
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cameraButtonContainerBottomConstraint.constant = -1 * (expandedButtonSize + spacing)
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libraryButtonContainerBottomConstraint.constant = -2 * (expandedButtonSize + spacing)
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documentButtonContainerBottomConstraint.constant = -3 * (expandedButtonSize + spacing)
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gifButtonContainerBottomConstraint.constant = -4 * (expandedButtonSize + spacing)
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UIView.animate(withDuration: 0.25) {
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[ self.gifButtonContainer, self.documentButtonContainer, self.libraryButtonContainer, self.cameraButtonContainer ].forEach {
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$0.alpha = 1
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}
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self.layoutIfNeeded()
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}
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} else {
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[ gifButtonContainerBottomConstraint, documentButtonContainerBottomConstraint, libraryButtonContainerBottomConstraint, cameraButtonContainerBottomConstraint ].forEach {
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$0.constant = 0
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}
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UIView.animate(withDuration: 0.25) {
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[ self.gifButtonContainer, self.documentButtonContainer, self.libraryButtonContainer, self.cameraButtonContainer ].forEach {
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$0.alpha = 0
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}
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self.layoutIfNeeded()
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}
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}
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}
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// MARK: Interaction
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func handleInputViewButtonTapped(_ inputViewButton: InputViewButton) {
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if inputViewButton == gifButton { delegate.handleGIFButtonTapped(); isExpanded = false }
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if inputViewButton == documentButton { delegate.handleDocumentButtonTapped(); isExpanded = false }
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if inputViewButton == libraryButton { delegate.handleLibraryButtonTapped(); isExpanded = false }
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if inputViewButton == cameraButton { delegate.handleCameraButtonTapped(); isExpanded = false }
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if inputViewButton == mainButton { isExpanded = !isExpanded }
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}
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// MARK: Convenience
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private func container(for button: InputViewButton) -> UIView {
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let result = UIView()
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result.addSubview(button)
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result.set(.width, to: InputViewButton.expandedSize)
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result.set(.height, to: InputViewButton.expandedSize)
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button.center(in: result)
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return result
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}
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}
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// MARK: Delegate
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protocol ExpandingAttachmentsButtonDelegate {
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func handleGIFButtonTapped()
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func handleDocumentButtonTapped()
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func handleLibraryButtonTapped()
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func handleCameraButtonTapped()
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}
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