111 lines
3.4 KiB
Swift
111 lines
3.4 KiB
Swift
//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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import Foundation
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@objc
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public class ConversationStyle: NSObject {
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private let thread: TSThread
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private let isRTL: Bool
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// The width of the collection view.
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@objc public var viewWidth: CGFloat = 0 {
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didSet {
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SwiftAssertIsOnMainThread(#function)
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updateProperties()
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}
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}
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@objc public let contentMarginTop: CGFloat = 24
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@objc public let contentMarginBottom: CGFloat = 24
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@objc public var gutterLeading: CGFloat = 0
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@objc public var gutterTrailing: CGFloat = 0
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// These are the gutters used by "full width" views
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// like "date headers" and "unread indicator".
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@objc public var fullWidthGutterLeading: CGFloat = 0
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@objc public var fullWidthGutterTrailing: CGFloat = 0
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// viewWidth - (gutterLeading + gutterTrailing)
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@objc public var contentWidth: CGFloat = 0
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// viewWidth - (gutterfullWidthGutterLeadingLeading + fullWidthGutterTrailing)
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@objc public var fullWidthContentWidth: CGFloat = 0
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@objc public var maxMessageWidth: CGFloat = 0
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@objc public var textInsetTop: CGFloat = 0
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@objc public var textInsetBottom: CGFloat = 0
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@objc public var textInsetHorizontal: CGFloat = 0
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// We want to align "group sender" avatars with the v-center of the
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// "last line" of the message body text - or where it would be for
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// non-text content.
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//
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// This is the distance from that v-center to the bottom of the
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// message bubble.
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@objc public var lastTextLineAxis: CGFloat = 0
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@objc
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public required init(thread: TSThread) {
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self.thread = thread
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self.isRTL = CurrentAppContext().isRTL
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super.init()
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updateProperties()
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NotificationCenter.default.addObserver(self,
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selector: #selector(uiContentSizeCategoryDidChange),
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name: NSNotification.Name.UIContentSizeCategoryDidChange,
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object: nil)
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}
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deinit {
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NotificationCenter.default.removeObserver(self)
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}
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@objc func uiContentSizeCategoryDidChange() {
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SwiftAssertIsOnMainThread(#function)
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updateProperties()
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}
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// MARK: -
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private func updateProperties() {
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if thread.isGroupThread() {
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gutterLeading = 40
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gutterTrailing = 20
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} else {
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gutterLeading = 16
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gutterTrailing = 20
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}
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fullWidthGutterLeading = gutterLeading
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fullWidthGutterTrailing = gutterTrailing
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contentWidth = viewWidth - (gutterLeading + gutterTrailing)
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fullWidthContentWidth = viewWidth - (fullWidthGutterLeading + fullWidthGutterTrailing)
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maxMessageWidth = floor(contentWidth - 48)
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let messageTextFont = UIFont.ows_dynamicTypeBody
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// Don't include the distance from the "cap height" to the top of the UILabel
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// in the top margin.
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textInsetTop = max(0, 12 - (messageTextFont.ascender - messageTextFont.capHeight))
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// Don't include the distance from the "baseline" to the bottom of the UILabel
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// (e.g. the descender) in the top margin. Note that UIFont.descender is a
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// negative value.
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textInsetBottom = max(0, 12 - abs(messageTextFont.descender))
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textInsetHorizontal = 12
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lastTextLineAxis = CGFloat(round(12 + messageTextFont.capHeight * 0.5))
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}
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}
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