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AutoLayout wrapper to make creating constraints in F# easier
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module Praeclarum.AutoLayout | |
open System | |
#if __IOS__ | |
open Foundation | |
open UIKit | |
type NativeView = UIView | |
#else | |
open MonoMac.Foundation | |
open MonoMac.AppKit | |
type NativeView = NSView | |
#endif | |
/// A first-class value representing a layout attribute on a view. | |
/// Algebraic operations +, -, *, and / are supported to modify the attribute. | |
/// Use ==, <==, and >== to create constraints. | |
/// Use @@ to set the priority of the constraint (1000 is the default). | |
type LayoutAttributeReference = | |
{ | |
View : NativeView | |
Attribute : NSLayoutAttribute | |
M : nfloat | |
C : nfloat | |
P : float32 | |
} | |
static member CreateConstraint a b r = | |
let m, c, p = b.M / a.M, (b.C - a.C) / a.M, Math.Min (a.P, b.P) | |
NSLayoutConstraint.Create (a.View :> NSObject, a.Attribute, r, b.View :> NSObject, b.Attribute, m, c, Priority = p) | |
static member ( == ) (a, b) = LayoutAttributeReference.CreateConstraint a b NSLayoutRelation.Equal | |
static member ( >== ) (a, b) = LayoutAttributeReference.CreateConstraint a b NSLayoutRelation.GreaterThanOrEqual | |
static member ( <== ) (a, b) = LayoutAttributeReference.CreateConstraint a b NSLayoutRelation.LessThanOrEqual | |
static member ( @@ ) (r, p) = { r with P = p } | |
static member ( * ) (m : nfloat, r) = { r with M = r.M * m; C = r.C * m } | |
static member ( * ) (r, m : nfloat) = { r with M = r.M * m; C = r.C * m } | |
static member ( / ) (r, m : nfloat) = { r with M = r.M / m; C = r.C / m } | |
static member ( + ) (c : nfloat, r) = { r with C = r.C + c } | |
static member ( + ) (r, c : nfloat) = { r with C = r.C + c } | |
static member ( - ) (c : nfloat, r) = { r with M = -r.M; C = c - r.C } | |
static member ( - ) (r, c : nfloat) = { r with C = r.C - c } | |
#if __IOS__ | |
type UIView with | |
#else | |
type NSView with | |
#endif | |
member this.VerticalHuggingPriority | |
with get () : float32 = this.ContentHuggingPriority (UILayoutConstraintAxis.Vertical) | |
and set v = this.SetContentHuggingPriority (v, UILayoutConstraintAxis.Vertical) | |
member this.HorizontalHuggingPriority | |
with get () : float32 = this.ContentHuggingPriority (UILayoutConstraintAxis.Horizontal) | |
and set v = this.SetContentHuggingPriority (v, UILayoutConstraintAxis.Horizontal) | |
member this.LayoutBaseline = { View = this; Attribute = NSLayoutAttribute.Baseline; M = nfloat 1.0; C = nfloat 0.0; P = 1000.0f } | |
member this.LayoutBottom = { View = this; Attribute = NSLayoutAttribute.Bottom; M = nfloat 1.0; C = nfloat 0.0; P = 1000.0f } | |
member this.LayoutCenterX = { View = this; Attribute = NSLayoutAttribute.CenterX; M = nfloat 1.0; C = nfloat 0.0; P = 1000.0f } | |
member this.LayoutCenterY = { View = this; Attribute = NSLayoutAttribute.CenterY; M = nfloat 1.0; C = nfloat 0.0; P = 1000.0f } | |
member this.LayoutHeight = { View = this; Attribute = NSLayoutAttribute.Height; M = nfloat 1.0; C = nfloat 0.0; P = 1000.0f } | |
member this.LayoutLeading = { View = this; Attribute = NSLayoutAttribute.Leading; M = nfloat 1.0; C = nfloat 0.0; P = 1000.0f } | |
member this.LayoutLeft = { View = this; Attribute = NSLayoutAttribute.Left; M = nfloat 1.0; C = nfloat 0.0; P = 1000.0f } | |
member this.LayoutRight = { View = this; Attribute = NSLayoutAttribute.Right; M = nfloat 1.0; C = nfloat 0.0; P = 1000.0f } | |
member this.LayoutTop = { View = this; Attribute = NSLayoutAttribute.Top; M = nfloat 1.0; C = nfloat 0.0; P = 1000.0f } | |
member this.LayoutTrailing = { View = this; Attribute = NSLayoutAttribute.Trailing; M = nfloat 1.0; C = nfloat 0.0; P = 1000.0f } | |
member this.LayoutWidth = { View = this; Attribute = NSLayoutAttribute.Width; M = nfloat 1.0; C = nfloat 0.0; P = 1000.0f } | |
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