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TabViewGridCell.swift
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TabViewGridCell.swift
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//
// TabViewGridCell.swift
// DuckDuckGo
//
// Copyright © 2017 DuckDuckGo. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
import UIKit
import Core
class TabViewGridCell: TabViewCell {
struct Constants {
static let selectedBorderWidth: CGFloat = 2.0
static let unselectedBorderWidth: CGFloat = 0.0
static let swipeToDeleteAlpha: CGFloat = 0.5
static let cellCornerRadius: CGFloat = 8.0
static let cellHeaderHeight: CGFloat = 38.0
static let cellLogoSize: CGFloat = 68.0
}
static let reuseIdentifier = "TabViewGridCell"
@IBOutlet weak var background: UIView!
@IBOutlet weak var border: UIView!
@IBOutlet weak var favicon: UIImageView!
@IBOutlet weak var title: UILabel!
@IBOutlet weak var removeButton: UIButton!
@IBOutlet weak var unread: UIImageView!
@IBOutlet weak var preview: UIImageView!
weak var previewAspectRatio: NSLayoutConstraint?
@IBOutlet var previewTopConstraint: NSLayoutConstraint?
@IBOutlet var previewBottomConstraint: NSLayoutConstraint?
@IBOutlet var previewTrailingConstraint: NSLayoutConstraint?
override func setupSubviews() {
super.setupSubviews()
unread.tintColor = .cornflowerBlue
}
private func updatePreviewToDisplay(image: UIImage) {
let imageAspectRatio = image.size.height / image.size.width
let containerAspectRatio = (background.bounds.height - TabViewGridCell.Constants.cellHeaderHeight) / background.bounds.width
let strechContainerVerically = containerAspectRatio < imageAspectRatio
if let constraint = previewAspectRatio {
preview.removeConstraint(constraint)
}
previewTopConstraint?.constant = Constants.cellHeaderHeight
previewBottomConstraint?.isActive = !strechContainerVerically
previewTrailingConstraint?.isActive = strechContainerVerically
previewAspectRatio = preview.heightAnchor.constraint(equalTo: preview.widthAnchor, multiplier: imageAspectRatio)
previewAspectRatio?.isActive = true
}
private func updatePreviewToDisplayLogo() {
if let constraint = previewAspectRatio {
preview.removeConstraint(constraint)
previewAspectRatio = nil
}
previewTopConstraint?.constant = 0
previewBottomConstraint?.isActive = true
previewTrailingConstraint?.isActive = true
}
private static var darkThemeUnreadImage = UIImage.stackedIconImage(withIconImage: UIImage(named: "TabUnread")!,
borderWidth: 6.0,
foregroundColor: .cornflowerBlue,
borderColor: DarkTheme().tabSwitcherCellBackgroundColor)
private static var lighThemeUnreadImage = UIImage.stackedIconImage(withIconImage: UIImage(named: "TabUnread")!,
borderWidth: 6.0,
foregroundColor: .cornflowerBlue,
borderColor: LightTheme().tabSwitcherCellBackgroundColor)
private static func unreadImage(for theme: Theme) -> UIImage {
switch theme.currentImageSet {
case .dark:
return darkThemeUnreadImage
case .light:
return lighThemeUnreadImage
}
}
static let logoImage: UIImage = {
let image = UIImage(named: "Logo")!
let renderFormat = UIGraphicsImageRendererFormat.default()
renderFormat.opaque = false
let renderer = UIGraphicsImageRenderer(size: CGSize(width: Constants.cellLogoSize,
height: Constants.cellLogoSize),
format: renderFormat)
return renderer.image { _ in
image.draw(in: CGRect(x: 0,
y: 0,
width: Constants.cellLogoSize,
height: Constants.cellLogoSize))
}
}()
override func update(withTab tab: Tab,
preview: UIImage?,
reorderRecognizer: UIGestureRecognizer?) {
accessibilityElements = [ title as Any, removeButton as Any ]
self.tab = tab
self.collectionReorderRecognizer = reorderRecognizer
if !isDeleting {
isHidden = false
}
isCurrent = delegate?.isCurrent(tab: tab) ?? false
decorate(with: ThemeManager.shared.currentTheme)
border.layer.borderWidth = isCurrent ? Constants.selectedBorderWidth : Constants.unselectedBorderWidth
if let link = tab.link {
removeButton.accessibilityLabel = UserText.closeTab(withTitle: link.displayTitle, atAddress: link.url.host ?? "")
title.accessibilityLabel = UserText.openTab(withTitle: link.displayTitle, atAddress: link.url.host ?? "")
title.text = tab.link?.displayTitle
}
unread.isHidden = tab.viewed
if tab.link == nil {
updatePreviewToDisplayLogo()
self.preview.image = Self.logoImage
self.preview.contentMode = .center
title.text = UserText.homeTabTitle
favicon.image = UIImage(named: "Logo")
unread.isHidden = true
self.preview.isHidden = !tab.viewed
title.isHidden = !tab.viewed
favicon.isHidden = !tab.viewed
removeButton.isHidden = !tab.viewed
} else {
if let preview = preview {
self.updatePreviewToDisplay(image: preview)
self.preview.contentMode = .scaleAspectFill
self.preview.image = preview
} else {
self.preview.image = nil
}
removeButton.isHidden = false
favicon.loadFavicon(forDomain: tab.link?.url.host, usingCache: .tabs)
}
}
override func decorate(with theme: Theme) {
super.decorate(with: theme)
border.layer.borderColor = theme.tabSwitcherCellBorderColor.cgColor
unread.image = Self.unreadImage(for: theme)
background.backgroundColor = theme.tabSwitcherCellBackgroundColor
title.textColor = theme.tabSwitcherCellTextColor
}
}