MacOS (#650)

* [MacOS] Add SwitchRenderer

* [MacOS] Add TimePickerRenderer

* [MacOS] Cleanup TimePcikerRender

* [MacOS] Add WebViewRenderer

* [MacOS] Add Javascript evaluate to webview

* [MacOS] Fix build error on WebViewRenderer

* [MacOS] Add Base and TextCell renderers

* [MacOS] Start on ListViewRenderer

* [MacOS] Cleanup

* [MacOS] Vertical center text on default NSTextField

* [MacOS] Center NSTextField vertically

* [MacOS] Add ImageCellRenderer

* [MacOS] Add SwitchCellRenderer

* [MacOS] Add SwitchCellRenderer

* [iOS] Allow to set background color on other CellRenderers

* [MacOS] Fix selection mode on ListView

* [MacOS] Set background on Entry of entry cell

* [MacOS] Fix casting bug on CellRenderer

* [MacOS] Other fix on CellRenderer background

* [MacOS] Add ViewCellRenderer

* [MacOS] Fixes and cleanup on cells

* [MacOS] Add NSScrollView so NSTableView can scroll

* [MacOS] Add HeaderView to ListView

* [MacOS] Cleanup

* [Controls] Add Header support to ListView

* [MacOS] NSView reuse on NSTableView

* [MacOS] Some fix on layour order

* [MacOS] Add CarouselPageRenderer

* [MacOS] Implement EventTracker on PageRenderer

* [MacOS] Cleanup CarouselPageRenderer

* [MacOS] Add MasterDetailPage renderer

* [MacOS] MDP renderer don't allow drag of splitter

* [MacOS] Add TabbedPage renderer

* [MacOS] Initial sketch of NavigationPageRenderer

* [MacOS] Send disappearing of CurrentPage on Dispose on NavigationPageRenderer

* [MacOS] Add Gallery page for Mac

* [MacOS] Add MacOSExpressionSearch

* [MacOS] Fix ColorExtension

* [MacOS] Fix MDP renderer layout

* [MacOS] Implement native selection on ListViewRenderer

* [MacOS] Deselect a item on NSTableView

* [MacOS] Remove previous SplitViewItems

* [MacOS] Fix navigationpage height

* [MacOS] Add toolbar for NavigationPageRenderer

* [MacOS] Don't remove selection for now (crashing)

* [MacOS] Refactor page and back button title on NavigationPageRenderer

* [MacOS] Fix bug when native navigate back

* [MacOS] Hide layer when transition

* [MacOS] ListviewRenderer fix BbackgroundColor

* [MacOS] Fix background on ScrollViewRenderer

* [MacOS] Fix header measure on ListViewRenderer

* [MacOS] Add Mac twitter demo

* [Controls] Spaces for easy reading

* [MacOS] More xaml cleanup

* [Core] Add Mac as aTargetPlatform

* [MacOS] Add alerts and actionsheets

* [MacOS] Add GestureRecognizers

* [MacOS] Fix Layout issues when adding children, enable transformations

* [MacOS] Fix title on tab item, move to tabbed navigation based on segmented control

* [MacOS] Hide toolbar when not needed, this allows to work with tabbed page, cleanup

* [MacOS] Add NativeBindings and NativeViewWrapper

* [MacOS] Fix AssemblyInfo

* [MacOS] FIX NRE on SetBackgroundColor BoxView

* [MacOS] Fix NavigationPageRenderer

* [MacOS] Fix build

* [MacOS] Also update page when it resizes

* [MacOS] Add LayoutRenderer for handle items position when the bounds change.

* [MacOS] Refactor/Cleanup

* [MacOS] Add toolbar items support to NavigationPage

* [MacOS] Resize images for TabViewITems

* [MacOS] Fix TabbedPage resize issues , allow users to override some features when creating TVI

* [MacOS] Fix hide/show Navigation toolbar

* [MacOS] Redo CarouselPageRenderer with NSPageController

* [MacOS] Add support for Modal pages

* [MacOS] Refactor navigation from platform

* [Nuget] Add nuget for MacOS

* [Nuget]Fix nuspec

* [Nuget] Add variables for CI

* [Controls] Remove MainMenu from MacOS

* [MacOS] Add TableView renderer (no headers yet)

* [MacOS] Refactoring, marking extensions as internal

* [MacOS] Add group headers for TableViewRenderer

* [MacOS] Workaround for updates on listview collection

* [MacOS] Handle updates of rows in the ListViewRenderer properly

* [MacOS] Fix navigation animation

* Fix navigation header issues with modal pages

* [MacOS] Fix MDP issues with resizing

* [MacOS] Fix general dispose

* [MacOS] Add a ViewControllerWrapper for NSSplitView

* [MacOS] MDP renderer fix animation

* [MacOS] Fix ListView selection bug

* [MacOS] Fix rendering MDP Layout inside wrappers

* [MacOS] Re write the MainToolbar handler

* [MacOS] Don't use Sierra new extensions so we can run in stable channel

* [MacOS] Another way to hide the toolbar (smarter i think)

* [MacOS] Fix MDP bug and remove debug color

* [Controls] Add HanselForms sample

* [MacOS] Fix NRE WebviewRenderer

* [MacOS] Fix uneven rows on ListView renderer

* [MacOS] Fix NRE on load (can+t find the reason this happens)

* [MacOS] Fix uneven rows

* [MacOS] Fix header sizing on ListViewRenderer

* [Controls] More stuff on HanselForms

* [MacOS] Remove warning from ListViewRenderer

* [MacOS] Fix PageRenderer bug double init

* [MacOS] Don't calculate height if RowHeight is provided

* [Controls] More Hanselforms stuff

* [MacOS] Once again a new implementation for the NavigationBar, this time using a custom view to support BackgroundColor

* [MacOS] Fix build

* [MacOS] Refactoring AwesomeBar related controls

* Fix build

* [MacOS] NavigationBar update background and t test colors

* [MacOS] Fix when we remove navigation so it works when the NavigationRenderer wasn't removed from the parent controller like in a TabbedPage

* [MacOS] Add support for ListView  grouping

* [MacOS] Fix image extension method.

* [MacOS] Add base Maps project

* [MacOS] Export MapRenderer

* [MacOS] Add pin click and geocoderbacked for Maps

* [MacOS] Add extra binding project for API not in stable.

* [MacOS] Add MacOS Maps lib

* [MacOS]Fix build on alpha

* [MacOS] Remove MacOS Maps extra binding

* [UITest] Basic macOS setup

* [UITest] Add MacOSApp wrapper implementation

* [MacOS] Set AutomationID

* [UITests] Add ActionSheetUITests to MacOS UITest

* [MacOS] Fix bug on Picker

* [UITests] Link basic uitest basefixture and related files

* [MacOS] Fix pickers reuse

* [UItests] Fix MacOS app path

* [UITest] Ignore UItest for appearing on macOS for now

* [UITest] Update macOS for 2.0.3

* [UITest] Refactor EnterText MacOS app

* [UITest]Fix ViewQuery on MacOS

* [UITest]Fix IsEnabled UItest on macOS

* [UITest] Implement Enter, mark some tests inconclusive fix others

* [MacOS] Implement Entry Completed event

* [UITests] Fix UITest for IsVisible, ignore ToolbarItem test for now

* [UITests] Fix ISVisible again add extra category

* [Controls] Cleanup macOS gallery

* [MacOS] Fix Assembly info

* [Docs] Fix docs

* Fix build

* [Nuget] Fix nuspec

* [Controls] Link files on MacOS

* [Core] Update Forms stack before firing a event saying page was removed, possible breaking change

* [MacOS] Implement RemovePage on NavigationPAgeRenderer

* [UItest] Ignore some , implement back on MacOS UITest app

* [MacOS] Add default back button name (needs to be translated)

* [MacOS] Fix dispose

* [UITest] Make 29257 work on MacOS

* [MacOS] Rename stuff

* [MacOS] More renaming and cleanup

* [MacOS] Share implementations for iOS

* [MacOS] Reuse more IOS extensions

* [MacOS] Reuse FontExtensions

* [MacOS] Share NativeViewWrapper related stuff

* [MAcOS] Share event args and ExportRenderer

* [MacOS] Share platform effect

* [MacOS] Fix build

* [Docs]Fixing docs

* [MacOS] Fix ViewCell reuse

* [Core] Support ListView CachingStrategy on MacOS

* [MacOS] Fix issues with TextCell and ImageCell (we can’t set null to a NSControl value)

* [MacOS] Fix MDP child sizing bug
[UITest] Query marked by id and text

* [MacOS] Comment test related with context actions

* [MacOS] Implement missing stuff on ticker

* [MacOS] Make sure VisualElemenTracker calls the ticker update

* [UITests]Ignore context actions and not possible to test

* [MacOS] Fix Grouping bug on Listview

* [MacOS] Fix selection on Listview when using grouping

* [MacOS] Update navbar when page is popped

* [MacOS] Cleanup NavigationBar

* [Controls] More info on exceptions

* [MacOS] Fix bug animation pop modal

* [MacOS] Bring back BackgroundColor of NavigationBar

* [MacOS] Fix UITest animation delay

* [MacOS] Treat warnings as errors

* [MacOS] Center title on toolbar

* [Core] Add Platform configuration specific for MacOS

* [MacOS] Implement TabbedPage platform specific to handle TabItems on NavigationPage bar

* [MacOS] Fix warning

* [MacOS] Fix bug on SearchBar color

* [MacOS]Fix build

* [MacOS] remove extra dll from maps

* [Docs] Update docs

* [MacOS]Cleanup and refactoring

* Revert "[MacOS] remove extra dll from maps"

This reverts commit 73b948937001fea3f28449a963d0b94943e07aa0.

* [MacOS] Fix wrong refactoring

* [MacOS] Remove gallery and uitest project

* [MacOS] dix formatting

* [MacOS] Remove extra stuff

* Merge branch 'master' into macOS-gallery

* [MacOS] Fix rebase

* [MacOS] Fix TargetPlatform

* fix docs

* [MacOS] Fix bug on TabbedPageRenderer no title

* [MacOS] Remove FormsNSView

* [MacOS] Cleanup on dispose on MDP renderer

* [MacOS] Update current page when source changes

* [MacOS] More cleanup

* [MacOS] Make sure we show the previous page when popping a Modal

* [MacOS] Fix issue with sizing the Header and visibility, remove for now header renderer reuse

* [MacOS] Clean CustomNSTableView

* [MacOS] Share LabelRenderer with iOS

* [MacOS] Share ResourcesProvider with iOS

* [MAcoS] Share VisualElementPackager with iOS

* [MacOS] Share ViewRenderer with iOS

* [MacOS] Merge with VisualElementTracker from iOS

* [MacOS] Merge with EventTracker from iOS

* [MacOS] Merge with VisualElementRenderer of iOS

* [MacOS] Make sure we always have a layer

* [MacOS] Fix Tracker merge with iOS version

* [MacOS] Fix bug with tabbed page on modal without navigation

* [Core] Rever change on core

* [MacOS] Clear renderers before setting them MDP

* [MacOS] Update tabbedPage ContainerArea

* [MacOS] Fix ListViewRenderer

* [MacOS] Make sure we don’t pass null to TextField string value

* [MacOS] Support for multiple clicks in same selected item on NSTableView

* [MacOS] Support Focus on EntryRenderer

* [MacOS] Fix index bug on TablevIewDataSource

* [MacOS] Fix SelectedItem TableViewDataSource

* [Nuget] Add Mac to Maps nuspec

* [Nuget]Fix path

* [macOS] Fixed Tab NSImage crash in TabbedPageRenderer (#705)

* [macOS] Fixed Tab NSImage crash in TabbedPageRenderer

* Coding Style

* Coding Style

* [MacOS] Fix previous merge with master

* [MacOS] Possible simple fix for click on views overlapping

* [MacOS] Rename to IsOnViewCell

* [MacOS] Cleanup, Address feedback from Samantha’s review

7 files changed, 246 insertions, 0 deletions

diff --git a/Xamarin.Forms.Platform.MacOS/Controls/FormsImageView.cs b/Xamarin.Forms.Platform.MacOS/Controls/FormsImageView.cs
new file mode 100644
index 00000000..33ed73b6
--- /dev/null
+++ b/Xamarin.Forms.Platform.MacOS/Controls/FormsImageView.cs
@@ -0,0 +1,16 @@
+using AppKit;
+
+namespace Xamarin.Forms.Platform.MacOS
+{
+	internal class FormsNSImageView : NSImageView
+	{
+		bool _isOpaque;
+
+		public void SetIsOpaque(bool isOpaque)
+		{
+			_isOpaque = isOpaque;
+		}
+
+		public override bool IsOpaque => _isOpaque;
+	}
+}
\ No newline at end of file
diff --git a/Xamarin.Forms.Platform.MacOS/Controls/FormsPageControllerDelegate.cs b/Xamarin.Forms.Platform.MacOS/Controls/FormsPageControllerDelegate.cs
new file mode 100644
index 00000000..5fb7455c
--- /dev/null
+++ b/Xamarin.Forms.Platform.MacOS/Controls/FormsPageControllerDelegate.cs
@@ -0,0 +1,29 @@
+using System;
+using AppKit;
+using Foundation;
+
+namespace Xamarin.Forms.Platform.MacOS
+{
+	internal class FormsPageControllerDelegate : NSPageControllerDelegate
+	{
+		readonly Func<NSObject, string> _getIdentifier;
+		readonly Func<string, NSViewController> _getViewController;
+
+		public FormsPageControllerDelegate(Func<NSObject, string> getIdentifier,
+			Func<string, NSViewController> getViewController)
+		{
+			_getIdentifier = getIdentifier;
+			_getViewController = getViewController;
+		}
+
+		public override NSViewController GetViewController(NSPageController pageController, string identifier)
+		{
+			return _getViewController(identifier);
+		}
+
+		public override string GetIdentifier(NSPageController pv, NSObject obj)
+		{
+			return _getIdentifier(obj);
+		}
+	}
+}
\ No newline at end of file
diff --git a/Xamarin.Forms.Platform.MacOS/Controls/MacOSOpenGLView.cs b/Xamarin.Forms.Platform.MacOS/Controls/MacOSOpenGLView.cs
new file mode 100644
index 00000000..1fc23876
--- /dev/null
+++ b/Xamarin.Forms.Platform.MacOS/Controls/MacOSOpenGLView.cs
@@ -0,0 +1,12 @@
+using AppKit;
+
+namespace Xamarin.Forms.Platform.MacOS
+{
+	//TODO: Still not implemented on MacOS
+	public class MacOSOpenGLView : NSView
+	{
+		public MacOSOpenGLView()
+		{
+		}
+	}
+}
\ No newline at end of file
diff --git a/Xamarin.Forms.Platform.MacOS/Controls/NSToolbarItemGroup.cs b/Xamarin.Forms.Platform.MacOS/Controls/NSToolbarItemGroup.cs
new file mode 100644
index 00000000..ee02293c
--- /dev/null
+++ b/Xamarin.Forms.Platform.MacOS/Controls/NSToolbarItemGroup.cs
@@ -0,0 +1,102 @@
+using System;
+using System.Runtime.InteropServices;
+using AppKit;
+using Foundation;
+using ObjCRuntime;
+
+[Register("NSToolbarItemGroup", true)]
+// ReSharper disable once CheckNamespace
+// ReSharper disable once InconsistentNaming
+public class NSToolbarItemGroup : NSToolbarItem
+{
+	const string SelSetSubitems = "setSubitems:";
+	const string SelSubitems = "subitems";
+	const string SelInitWithItemIdentifier = "initWithItemIdentifier:";
+	static readonly IntPtr s_selSetSubitemsHandle = Selector.GetHandle(SelSetSubitems);
+	static readonly IntPtr s_selSubitemsHandle = Selector.GetHandle(SelSubitems);
+	static readonly IntPtr s_selInitWithItemIdentifierHandle = Selector.GetHandle(SelInitWithItemIdentifier);
+	static readonly IntPtr s_classPtr = Class.GetHandle("NSToolbarItemGroup");
+
+	[Export("init")]
+	public NSToolbarItemGroup() : base(NSObjectFlag.Empty)
+	{
+		InitializeHandle(
+			IsDirectBinding
+				? IntPtr_objc_msgSend(Handle, Selector.GetHandle("init"))
+				: IntPtr_objc_msgSendSuper(SuperHandle, Selector.GetHandle("init")), "init");
+	}
+
+	[Export("initWithItemIdentifier:")]
+	public NSToolbarItemGroup(string itemIdentifier)
+		: base(NSObjectFlag.Empty)
+	{
+		NSApplication.EnsureUIThread();
+		if (itemIdentifier == null)
+			throw new ArgumentNullException(nameof(itemIdentifier));
+		IntPtr nsitemIdentifier = NSString.CreateNative(itemIdentifier);
+
+		InitializeHandle(
+			IsDirectBinding
+				? IntPtr_objc_msgSend_IntPtr(Handle, s_selInitWithItemIdentifierHandle, nsitemIdentifier)
+				: IntPtr_objc_msgSendSuper_IntPtr(SuperHandle, s_selInitWithItemIdentifierHandle, nsitemIdentifier),
+			"initWithItemIdentifier:");
+		NSString.ReleaseNative(nsitemIdentifier);
+	}
+
+	protected internal NSToolbarItemGroup(IntPtr handle) : base(handle)
+	{
+	}
+
+	protected NSToolbarItemGroup(NSObjectFlag t) : base(t)
+	{
+	}
+
+	public override IntPtr ClassHandle => s_classPtr;
+
+	public virtual NSToolbarItem[] Subitems
+	{
+		[Export(SelSubitems, ArgumentSemantic.Copy)]
+		get
+		{
+			NSApplication.EnsureUIThread();
+			NSToolbarItem[] ret =
+				NSArray.ArrayFromHandle<NSToolbarItem>(IsDirectBinding
+					? IntPtr_objc_msgSend(Handle, s_selSubitemsHandle)
+					: IntPtr_objc_msgSendSuper(SuperHandle, s_selSubitemsHandle));
+			return ret;
+		}
+
+		[Export(SelSetSubitems, ArgumentSemantic.Copy)]
+		set
+		{
+			NSApplication.EnsureUIThread();
+			if (value == null)
+				throw new ArgumentNullException(nameof(value));
+			// ReSharper disable once CoVariantArrayConversion
+			NSArray nsaValue = NSArray.FromNSObjects(value);
+
+			if (IsDirectBinding)
+				void_objc_msgSend_IntPtr(Handle, s_selSetSubitemsHandle, nsaValue.Handle);
+			else void_objc_msgSendSuper_IntPtr(SuperHandle, s_selSetSubitemsHandle, nsaValue.Handle);
+			nsaValue.Dispose();
+		}
+	}
+
+	[DllImport("/usr/lib/libobjc.dylib", EntryPoint = "objc_msgSend")]
+	public static extern IntPtr IntPtr_objc_msgSend(IntPtr receiver, IntPtr selector);
+
+	[DllImport("/usr/lib/libobjc.dylib", EntryPoint = "objc_msgSend")]
+	public static extern IntPtr IntPtr_objc_msgSend_IntPtr(IntPtr receiver, IntPtr selector, IntPtr arg1);
+
+	[DllImport("/usr/lib/libobjc.dylib", EntryPoint = "objc_msgSendSuper")]
+	public static extern IntPtr IntPtr_objc_msgSendSuper(IntPtr receiver, IntPtr selector);
+
+	[DllImport("/usr/lib/libobjc.dylib", EntryPoint = "objc_msgSendSuper")]
+	public static extern IntPtr IntPtr_objc_msgSendSuper_IntPtr(IntPtr receiver, IntPtr selector, IntPtr arg1);
+
+	[DllImport("/usr/lib/libobjc.dylib", EntryPoint = "objc_msgSend")]
+	public static extern void void_objc_msgSend_IntPtr(IntPtr receiver, IntPtr selector, IntPtr arg1);
+
+	[DllImport("/usr/lib/libobjc.dylib", EntryPoint = "objc_msgSendSuper")]
+	public static extern void void_objc_msgSendSuper_IntPtr(IntPtr receiver, IntPtr selector, IntPtr arg1);
+}
\ No newline at end of file
diff --git a/Xamarin.Forms.Platform.MacOS/Controls/NavigationChildPageWrapper.cs b/Xamarin.Forms.Platform.MacOS/Controls/NavigationChildPageWrapper.cs
new file mode 100644
index 00000000..a0e6dd41
--- /dev/null
+++ b/Xamarin.Forms.Platform.MacOS/Controls/NavigationChildPageWrapper.cs
@@ -0,0 +1,41 @@
+using System;
+using Foundation;
+
+namespace Xamarin.Forms.Platform.MacOS
+{
+	internal class NavigationChildPageWrapper : NSObject
+	{
+		bool _disposed;
+
+		public NavigationChildPageWrapper(Page page)
+		{
+			Page = page;
+			Page.PropertyChanged += PagePropertyChanged;
+			Identifier = Guid.NewGuid().ToString();
+		}
+
+		protected override void Dispose(bool disposing)
+		{
+			if (disposing && !_disposed)
+			{
+				_disposed = true;
+				if (Page != null)
+					Page.PropertyChanged -= PagePropertyChanged;
+				Page = null;
+			}
+			base.Dispose(disposing);
+		}
+
+		void PagePropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
+		{
+			if (e.PropertyName == NavigationPage.HasNavigationBarProperty.PropertyName
+				|| e.PropertyName == Page.TitleProperty.PropertyName
+				|| e.PropertyName == NavigationPage.HasBackButtonProperty.PropertyName)
+				Platform.NativeToolbarTracker.UpdateToolBar();
+		}
+
+		public string Identifier { get; set; }
+
+		public Page Page { get; private set; }
+	}
+}
\ No newline at end of file
diff --git a/Xamarin.Forms.Platform.MacOS/Controls/ScrollViewScrollChangedEventArgs.cs b/Xamarin.Forms.Platform.MacOS/Controls/ScrollViewScrollChangedEventArgs.cs
new file mode 100644
index 00000000..a8a825c0
--- /dev/null
+++ b/Xamarin.Forms.Platform.MacOS/Controls/ScrollViewScrollChangedEventArgs.cs
@@ -0,0 +1,10 @@
+using System;
+using PointF = CoreGraphics.CGPoint;
+
+namespace Xamarin.Forms.Platform.MacOS
+{
+	internal class ScrollViewScrollChangedEventArgs : EventArgs
+	{
+		public PointF CurrentScrollPoint { get; set; }
+	}
+}
\ No newline at end of file
diff --git a/Xamarin.Forms.Platform.MacOS/Controls/VerticallyCenteredTextFieldCell.cs b/Xamarin.Forms.Platform.MacOS/Controls/VerticallyCenteredTextFieldCell.cs
new file mode 100644
index 00000000..397f632c
--- /dev/null
+++ b/Xamarin.Forms.Platform.MacOS/Controls/VerticallyCenteredTextFieldCell.cs
@@ -0,0 +1,36 @@
+using System;
+using AppKit;
+using CoreGraphics;
+
+namespace Xamarin.Forms.Platform.MacOS
+{
+	sealed class VerticallyCenteredTextFieldCell : NSTextFieldCell
+	{
+		readonly nfloat _yOffset;
+
+		public VerticallyCenteredTextFieldCell(nfloat yOffset, NSFont font = null)
+		{
+			if (font != null)
+				Font = font;
+			_yOffset = yOffset;
+		}
+
+		public override CGRect DrawingRectForBounds(CGRect theRect)
+		{
+			// Get the parent's idea of where we should draw.
+			CGRect newRect = base.DrawingRectForBounds(theRect);
+
+			// Ideal size for the text.
+			CGSize textSize = CellSizeForBounds(theRect);
+
+			// Center in the rect.
+			nfloat heightDelta = newRect.Size.Height - textSize.Height;
+			if (heightDelta > 0)
+			{
+				newRect.Size = new CGSize(newRect.Width, newRect.Height - heightDelta);
+				newRect.Location = new CGPoint(newRect.X, newRect.Y + heightDelta / 2 + _yOffset);
+			}
+			return newRect;
+		}
+	}
+}
\ No newline at end of file