SnapKit/Source/ConstraintConstantTarget.swift

148 lines
5.3 KiB
Swift

//
// SnapKit
//
// Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#if os(iOS) || os(tvOS)
import UIKit
#else
import AppKit
#endif
public protocol ConstraintConstantTarget {
}
extension CGPoint: ConstraintConstantTarget {
}
extension CGSize: ConstraintConstantTarget {
}
extension ConstraintInsets: ConstraintConstantTarget {
}
extension ConstraintConstantTarget {
internal func layoutConstantForLayoutAttribute(layoutAttribute: NSLayoutAttribute) -> CGFloat {
if let value = self as? Float {
return CGFloat(value)
}
if let value = self as? Double {
return CGFloat(value)
}
if let value = self as? Int {
return CGFloat(value)
}
if let value = self as? UInt {
return CGFloat(value)
}
if let value = self as? CGFloat {
return value
}
if let value = self as? CGSize {
if layoutAttribute == .Width {
return value.width
} else if layoutAttribute == .Height {
return value.height
} else {
return 0.0
}
}
if let value = self as? CGPoint {
#if os(iOS) || os(tvOS)
switch layoutAttribute {
case .Left, .Right, .Leading, .Trailing, .CenterX, .LeftMargin, .RightMargin, .LeadingMargin, .TrailingMargin, .CenterXWithinMargins:
return value.x
case .Top, .Bottom, .CenterY, .TopMargin, .BottomMargin, .CenterYWithinMargins, .Baseline, .FirstBaseline:
return value.y
case .Width, .Height, .NotAnAttribute:
return 0.0
}
#else
switch layoutAttribute {
case .Left, .Right, .Leading, .Trailing, .CenterX:
return value.x
case .Top, .Bottom, .CenterY, .Baseline, .FirstBaseline:
return value.y
case .Width, .Height, .NotAnAttribute:
return 0.0
}
#endif
}
if let value = self as? ConstraintInsets {
#if os(iOS) || os(tvOS)
switch layoutAttribute {
case .Left, .LeftMargin, .CenterX, .CenterXWithinMargins:
return value.left
case .Top, .TopMargin, .CenterY, .CenterYWithinMargins, .Baseline, .FirstBaseline:
return value.top
case .Right, .RightMargin:
return value.right
case .Bottom, .BottomMargin:
return value.bottom
case .Leading, .LeadingMargin:
return (ConstraintConfig.interfaceLayoutDirection == .LeftToRight) ? value.left : -value.right
case .Trailing, .TrailingMargin:
return (ConstraintConfig.interfaceLayoutDirection == .LeftToRight) ? value.right : -value.left
case .Width:
return -value.left + value.right
case .Height:
return -value.top + value.bottom
case .NotAnAttribute:
return 0.0
}
#else
switch layoutAttribute {
case .Left, .CenterX:
return value.left
case .Top, .CenterY, .Baseline, .FirstBaseline:
return value.top
case .Right:
return value.right
case .Bottom:
return value.bottom
case .Leading:
return (ConstraintConfig.interfaceLayoutDirection == .LeftToRight) ? value.left : -value.right
case .Trailing:
return (ConstraintConfig.interfaceLayoutDirection == .LeftToRight) ? value.right : -value.left
case .Width:
return -value.left + value.right
case .Height:
return -value.top + value.bottom
case .NotAnAttribute:
return 0.0
}
#endif
}
return 0.0
}
}