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Added multiplatform support, adapted iOS implementation, implemented macOS and added macOS sample project
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‎Cirrious.FluentLayout/Cirrious.FluentLayouts.Touch.csproj

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<?xml version="1.0" encoding="utf-8"?>
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<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<PropertyGroup>
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<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
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<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
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<ProjectGuid>{75D2DA9D-DFD4-49A1-98FB-FE0F0677EF0F}</ProjectGuid>
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<ProjectTypeGuids>{FEACFBD2-3405-455C-9665-78FE426C6842};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
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<OutputType>Library</OutputType>
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<RootNamespace>Cirrious.FluentLayouts.Touch</RootNamespace>
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<IPhoneResourcePrefix>Resources</IPhoneResourcePrefix>
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<AssemblyName>Cirrious.FluentLayouts.Touch</AssemblyName>
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<TargetFrameworkIdentifier>Xamarin.iOS</TargetFrameworkIdentifier>
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<TargetFrameworkVersion>v1.0</TargetFrameworkVersion>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
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<DebugSymbols>true</DebugSymbols>
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<DebugType>full</DebugType>
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<Optimize>false</Optimize>
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<OutputPath>bin\iPhoneSimulator\Debug</OutputPath>
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<DefineConstants>DEBUG</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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<ConsolePause>false</ConsolePause>
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<MtouchLink>None</MtouchLink>
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<MtouchDebug>true</MtouchDebug>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
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<DebugType>none</DebugType>
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<Optimize>true</Optimize>
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<OutputPath>bin\iPhoneSimulator\Release</OutputPath>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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<ConsolePause>false</ConsolePause>
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<MtouchLink>None</MtouchLink>
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</PropertyGroup>
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<ItemGroup>
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<Compile Include="AdvancedFluentLayoutExtensions.cs" />
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<Compile Include="FluentLayout.cs" />
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<Compile Include="FluentLayoutExtensions.cs" />
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<Compile Include="Margins.cs" />
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<Compile Include="Properties\AssemblyInfo.cs" />
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<Compile Include="RowSet-WorkInProgress\RowSet.cs" />
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<Compile Include="UIViewAndLayoutAttribute.cs" />
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<Compile Include="NfloatExtensions.cs" />
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<Compile Include="Extensions\ArrayExtensions.cs" />
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</ItemGroup>
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<ItemGroup>
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</ItemGroup>
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<ItemGroup>
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<Reference Include="System" />
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<Reference Include="System.Xml" />
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<Reference Include="System.Core" />
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<Reference Include="Xamarin.iOS" />
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</ItemGroup>
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<ItemGroup>
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<Folder Include="Extensions\" />
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</ItemGroup>
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<Import Project="$(MSBuildExtensionsPath)\Xamarin\iOS\Xamarin.iOS.CSharp.targets" />
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<Project Sdk="MSBuild.Sdk.Extras/2.0.41">
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<PropertyGroup>
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<TargetFrameworks>xamarin.ios10;xamarin.mac20</TargetFrameworks>
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<PackageProjectUrl>https://github.com/FluentLayout/Cirrious.FluentLayout</PackageProjectUrl>
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<Product>$(AssemblyName) ($(TargetFramework))</Product>
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<PackageTags>xamarin ios mac constraints</PackageTags>
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<PackageLicenseExpression>MS-PL</PackageLicenseExpression>
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<LangVersion>7.3</LangVersion>
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<NoWarn>$(NoWarn);1591;1701;1591;1702;1705;VSX1000;NU1603</NoWarn>
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<RepositoryUrl>https://github.com/FluentLayout/Cirrious.FluentLayout</RepositoryUrl>
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<RepositoryType>git</RepositoryType>
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<IncludeSymbols>True</IncludeSymbols>
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<IncludeSource>True</IncludeSource>
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<PublishRepositoryUrl>true</PublishRepositoryUrl>
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<EmbedUntrackedSources>true</EmbedUntrackedSources>
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<AllowedOutputExtensionsInPackageBuildOutputFolder>$(AllowedOutputExtensionsInPackageBuildOutputFolder);.pdb</AllowedOutputExtensionsInPackageBuildOutputFolder>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
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<DebugType>full</DebugType>
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<DebugSymbols>true</DebugSymbols>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
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<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
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<GenerateDocumentationFile>true</GenerateDocumentationFile>
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</PropertyGroup>
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<ItemGroup>
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<Compile Remove="Platforms\**\*.*" />
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<None Include="Platforms\**\*.*" />
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</ItemGroup>
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<ItemGroup Condition=" $(TargetFramework.StartsWith('xamarin.ios')) ">
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<Compile Include="Platforms\Shared\**\*.cs" />
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<Compile Include="Platforms\iOS\**\*.cs" />
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</ItemGroup>
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<ItemGroup Condition=" $(TargetFramework.StartsWith('xamarin.mac')) ">
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<Compile Include="Platforms\Shared\**\*.cs" />
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<Compile Include="Platforms\Mac\**\*.cs" />
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</ItemGroup>
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</Project>

‎Cirrious.FluentLayout/Platforms/Mac/AdvancedFluentLayoutExtensions.cs

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// AdvancedFluentLayoutExtensions.cs
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// (c) Copyright Cirrious Ltd. http://www.cirrious.com
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// MvvmCross is licensed using Microsoft Public License (Ms-PL)
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// Contributions and inspirations noted in readme.md and license.txt
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//
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// Project Lead - Stuart Lodge, @slodge, [email protected]
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using AppKit;
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using Cirrious.FluentLayouts.Touch.Extensions;
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namespace Cirrious.FluentLayouts.Touch
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{
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public static class AdvancedFluentLayoutExtensions
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{
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const float DefaultMargin = 0;
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const float DefaultScale = 1;
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public static FluentLayout AtTopOf(this NSView view, NSView parentView, nfloat? margin = null) =>
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view.Top().EqualTo().TopOf(parentView).Plus(margin.GetValueOrDefault(DefaultMargin));
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public static FluentLayout AtLeftOf(this NSView view, NSView parentView, nfloat? margin = null) =>
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view.Left().EqualTo().LeftOf(parentView).Plus(margin.GetValueOrDefault(DefaultMargin));
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public static FluentLayout AtRightOf(this NSView view, NSView parentView, nfloat? margin = null) =>
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view.Right().EqualTo().RightOf(parentView).Minus(margin.GetValueOrDefault(DefaultMargin));
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public static FluentLayout AtBottomOf(this NSView view, NSView parentView, nfloat? margin = null) =>
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view.Bottom().EqualTo().BottomOf(parentView).Minus(margin.GetValueOrDefault(DefaultMargin));
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public static FluentLayout AtLeadingOf(this NSView view, NSView parentView, nfloat? margin = null) =>
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view.Leading().EqualTo().LeadingOf(parentView).Plus(margin.GetValueOrDefault(DefaultMargin));
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public static FluentLayout AtTrailingOf(this NSView view, NSView parentView, nfloat? margin = null) =>
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view.Trailing().EqualTo().TrailingOf(parentView).Minus(margin.GetValueOrDefault(DefaultMargin));
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public static FluentLayout Below(this NSView view, NSView previous, nfloat? margin = null) =>
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view.Top().EqualTo().BottomOf(previous).Plus(margin.GetValueOrDefault(DefaultMargin));
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public static FluentLayout Above(this NSView view, NSView previous, nfloat? margin = null) =>
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view.Bottom().EqualTo().TopOf(previous).Minus(margin.GetValueOrDefault(DefaultMargin));
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public static FluentLayout WithSameLeft(this NSView view, NSView previous) => view.Left().EqualTo().LeftOf(previous);
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public static FluentLayout WithSameTop(this NSView view, NSView previous) => view.Top().EqualTo().TopOf(previous);
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public static FluentLayout WithSameCenterX(this NSView view, NSView previous) => view.CenterX().EqualTo().CenterXOf(previous);
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public static FluentLayout WithSameCenterY(this NSView view, NSView previous) => view.CenterY().EqualTo().CenterYOf(previous);
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public static FluentLayout WithSameRight(this NSView view, NSView previous) => view.Right().EqualTo().RightOf(previous);
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public static FluentLayout WithSameWidth(this NSView view, NSView previous) => view.Width().EqualTo().WidthOf(previous);
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public static FluentLayout WithSameBottom(this NSView view, NSView previous) => view.Bottom().EqualTo().BottomOf(previous);
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public static FluentLayout WithSameLeading(this NSView view, NSView previous) => view.Leading().EqualTo().LeadingOf(previous);
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public static FluentLayout WithSameTrailing(this NSView view, NSView previous) => view.Trailing().EqualTo().TrailingOf(previous);
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public static FluentLayout WithRelativeWidth(this NSView view, NSView previous, nfloat? scale = null) =>
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view.Width().EqualTo().WidthOf(previous).WithMultiplier(scale.GetValueOrDefault(DefaultScale));
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public static FluentLayout WithSameHeight(this NSView view, NSView previous) => view.Height().EqualTo().HeightOf(previous);
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public static FluentLayout WithRelativeHeight(this NSView view, NSView previous, nfloat? scale = null) =>
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view.Height().EqualTo().HeightOf(previous).WithMultiplier(scale.GetValueOrDefault(DefaultScale));
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public static FluentLayout ToRightOf(this NSView view, NSView previous, nfloat? margin = null) =>
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view.Left().EqualTo().RightOf(previous).Plus(margin.GetValueOrDefault(DefaultMargin));
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public static FluentLayout ToLeftOf(this NSView view, NSView previous, nfloat? margin = null) =>
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view.Right().EqualTo().LeftOf(previous).Minus(margin.GetValueOrDefault(DefaultMargin));
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public static FluentLayout ToTrailingOf(this NSView view, NSView previous, nfloat? margin = null) =>
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view.Leading().EqualTo().TrailingOf(previous).Plus(margin.GetValueOrDefault(DefaultMargin));
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public static FluentLayout ToLeadingOf(this NSView view, NSView previous, nfloat? margin = null) =>
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view.Trailing().EqualTo().LeadingOf(previous).Minus(margin.GetValueOrDefault(DefaultMargin));
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//public static FluentLayout ToLeftMargin(this NSView view, NSView previous) =>
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// view.Leading().EqualTo().LeadingMarginOf(previous);
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//public static FluentLayout ToRightMargin(this NSView view, NSView previous) =>
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// view.Trailing().EqualTo().TrailingMarginOf(previous);
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//public static FluentLayout ToTopMargin(this NSView view, NSView previous) =>
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// view.Top().EqualTo().TopMarginOf(previous);
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//public static FluentLayout ToBottomMargin(this NSView view, NSView previous) =>
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// view.Bottom().EqualTo().BottomMarginOf(previous);
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public static FluentLayout ToLeftOfCenterOf(this NSView view, NSView previous, nfloat? margin = null) =>
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view.Right().EqualTo().CenterXOf(previous).Minus(margin.GetValueOrDefault(0));
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public static FluentLayout ToRightOfCenterOf(this NSView view, NSView previous, nfloat? margin = null) =>
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view.Left().EqualTo().CenterXOf(previous).Plus(margin.GetValueOrDefault(0));
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public static FluentLayout AboveCenterOf(this NSView view, NSView previous, nfloat? margin = null) =>
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view.Bottom().EqualTo().CenterYOf(previous).Minus(margin.GetValueOrDefault(0));
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public static FluentLayout BelowCenterOf(this NSView view, NSView previous, nfloat? margin = null) =>
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view.Top().EqualTo().CenterYOf(previous).Plus(margin.GetValueOrDefault(0));
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public static IEnumerable<FluentLayout> FullWidthOf(this NSView view, NSView parent, nfloat? margin = null)
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{
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var marginValue = margin.GetValueOrDefault(DefaultMargin);
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return new List<FluentLayout>
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{
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view.AtLeftOf(parent, marginValue).WithIdentifier("Left"),
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view.AtRightOf(parent, marginValue).WithIdentifier("Right")
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};
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}
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public static IEnumerable<FluentLayout> FullHeightOf(this NSView view, NSView parent, nfloat? margin = null)
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{
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var marginValue = margin.GetValueOrDefault(DefaultMargin);
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return new List<FluentLayout>
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{
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view.AtTopOf(parent, marginValue).WithIdentifier("Top"),
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view.AtBottomOf(parent, marginValue).WithIdentifier("Bottom")
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};
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}
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public static IEnumerable<FluentLayout> FullSizeOf(this NSView view, NSView parent, nfloat? margin = null) =>
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FullSizeOf(view, parent, new Margins((float)margin.GetValueOrDefault(DefaultMargin)));
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public static IEnumerable<FluentLayout> FullSizeOf(this NSView view, NSView parent, Margins margins)
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{
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margins = margins ?? new Margins();
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return new List<FluentLayout>
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{
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view.AtTopOf(parent, margins.Top).WithIdentifier("Top"),
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view.AtBottomOf(parent, margins.Bottom).WithIdentifier("Bottom"),
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view.AtLeftOf(parent, margins.Left).WithIdentifier("Left"),
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view.AtRightOf(parent, margins.Right).WithIdentifier("Right")
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};
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}
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public static FluentLayout GetLayoutById(this IEnumerable<FluentLayout> layouts, string identifier) =>
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layouts.FirstOrDefault(x => x.Identifier.Equals(identifier));
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public static IEnumerable<FluentLayout> VerticalStackPanelConstraints(this NSView parentView, Margins margins, params NSView[] views) =>
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AdvancedVerticalStackPanelConstraints(parentView, margins, views: views);
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/// <summary>
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/// Vertical stack panel constraints with support for children independent left, right and top margins
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/// and a multiplier factor for all margins applied. The multiplier can be useful when dealing with iPad screens.
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/// Example:
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///
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/// scrollView.AddConstraints(scrollView.AdvancedVerticalStackPanelConstraints(null,
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/// childrenLeftMargins: new float[] { 15, 0, 15, 0, 0, 15 },
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/// childrenTopMargins: new float[] { 15, 5, 15, 5, 8, 15, 22, 8, 8, 28, 28 },
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/// marginMultiplier: 2f,
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/// views: scrollView.Subviews)
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/// );
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/// </summary>
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public static IEnumerable<FluentLayout> AdvancedVerticalStackPanelConstraints(this NSView parentView,
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Margins margins,
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float[] childrenLeftMargins = null,
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float[] childrenTopMargins = null,
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float[] childrenRightMargins = null,
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float marginMultiplier = 1,
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params NSView[] views)
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{
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string previousIdentifierPrefix = null;
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margins = margins ?? new Margins();
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var layouts = new List<FluentLayout>();
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var count = views.Length;
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for (var i = 0; i < count; i++)
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{
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var view = views[i];
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var viewIdentifierPrefix = $"{parentView.AccessibilityIdentifier ?? "VerticalStackPanel"}-{view.AccessibilityIdentifier ?? i.ToString()}-";
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float childLeftMargin;
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childrenLeftMargins.TryGetElement(i, out childLeftMargin);
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var marginLeft = Math.Max(margins.Left, childLeftMargin) * marginMultiplier;
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layouts.Add(view.Left()
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.EqualTo()
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.LeftOf(parentView)
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.Plus(marginLeft)
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.WithIdentifier(viewIdentifierPrefix + "Left"));
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float childRightMargin;
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childrenRightMargins.TryGetElement(i, out childRightMargin);
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var marginRight = Math.Max(margins.Right, childRightMargin) * marginMultiplier;
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layouts.Add(view.Width()
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.EqualTo()
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.WidthOf(parentView)
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.Minus(marginRight + marginLeft)
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.WithIdentifier(viewIdentifierPrefix + "Width"));
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float childTopMargin;
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childrenTopMargins.TryGetElement(i, out childTopMargin);
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layouts.Add(i == 0
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? view.Top()
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.EqualTo()
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.TopOf(parentView)
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.Plus(Math.Max(margins.Top, childTopMargin)*marginMultiplier)
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.WithIdentifier(viewIdentifierPrefix + "Top")
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: view.Top()
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.EqualTo()
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.BottomOf(views[i - 1])
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.Plus(Math.Max(margins.VSpacing, childTopMargin)*marginMultiplier)
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.WithIdentifier(viewIdentifierPrefix + "Top"));
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previousIdentifierPrefix = viewIdentifierPrefix;
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}
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if (parentView is NSScrollView)
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layouts.Add(views[views.Length - 1].Bottom()
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.EqualTo()
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.BottomOf(parentView)
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.Minus(margins.Bottom * marginMultiplier)
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.WithIdentifier(previousIdentifierPrefix + "Bottom"));
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return layouts;
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}
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}
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}

‎Cirrious.FluentLayout/Platforms/Mac/Extensions/NSViewExtensions.cs

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using AppKit;
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namespace Cirrious.FluentLayouts.Touch.Extensions
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{
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public static class NSViewExtensions
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{
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public static void AddSubviews(this NSView view, params NSView[] subviews)
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{
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foreach (var subview in subviews)
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view.AddSubview(subview);
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}
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}
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}

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