Add Anchor, Forms.LinkLabel and LinkView

Ooui.Forms/Controls/LinkLabel.cs

@@ -0,0 +1,20 @@
+using System;
+using Xamarin.Forms;
+
+namespace Ooui.Forms
+{
+    public class LinkLabel : Xamarin.Forms.Label
+    {
+        public static readonly BindableProperty HRefProperty = BindableProperty.Create ("HRef", typeof (string),
+            typeof (LinkView), string.Empty, BindingMode.OneWay, null, null, null, null);
+
+        public string HRef {
+            get { return (string)base.GetValue (HRefProperty); }
+            set { base.SetValue (HRefProperty, value); }
+        }
+
+        public LinkLabel ()
+        {
+        }
+    }
+}

Ooui.Forms/Controls/LinkView.cs

@@ -0,0 +1,20 @@
+using System;
+using Xamarin.Forms;
+
+namespace Ooui.Forms
+{
+    public class LinkView : ContentView
+    {
+        public static readonly BindableProperty HRefProperty = BindableProperty.Create ("HRef", typeof (string),
+            typeof (LinkView), string.Empty, BindingMode.OneWay, null, null, null, null);
+
+        public string HRef {
+            get { return (string)base.GetValue (HRefProperty); }
+            set { base.SetValue (HRefProperty, value); }
+        }
+
+        public LinkView ()
+        {
+        }
+    }
+}

Ooui.Forms/Exports.cs

@@ -3,23 +3,25 @@ using Ooui.Forms;
 using Ooui.Forms.Renderers;
 using Xamarin.Forms;
 
-[assembly: Dependency(typeof(ResourcesProvider))]
+[assembly: Dependency (typeof (ResourcesProvider))]
-[assembly: ExportRenderer(typeof(ActivityIndicator), typeof(ActivityIndicatorRenderer))]
+[assembly: ExportRenderer (typeof (ActivityIndicator), typeof (ActivityIndicatorRenderer))]
-[assembly: ExportRenderer(typeof(BoxView), typeof(BoxRenderer))]
+[assembly: ExportRenderer (typeof (BoxView), typeof (BoxRenderer))]
-[assembly: ExportRenderer(typeof(Button), typeof(ButtonRenderer))]
+[assembly: ExportRenderer (typeof (Button), typeof (ButtonRenderer))]
-[assembly: ExportRenderer(typeof(DatePicker), typeof(DatePickerRenderer))]
+[assembly: ExportRenderer (typeof (DatePicker), typeof (DatePickerRenderer))]
-[assembly: ExportRenderer(typeof(Editor), typeof(EditorRenderer))]
+[assembly: ExportRenderer (typeof (Editor), typeof (EditorRenderer))]
-[assembly: ExportRenderer(typeof(Entry), typeof(EntryRenderer))]
+[assembly: ExportRenderer (typeof (Entry), typeof (EntryRenderer))]
-[assembly: ExportRenderer(typeof(Frame), typeof(FrameRenderer))]
+[assembly: ExportRenderer (typeof (Frame), typeof (FrameRenderer))]
-[assembly: ExportRenderer(typeof(Image), typeof(ImageRenderer))]
+[assembly: ExportRenderer (typeof (Image), typeof (ImageRenderer))]
-[assembly: ExportRenderer(typeof(Label), typeof(LabelRenderer))]
+[assembly: ExportRenderer (typeof (Label), typeof (LabelRenderer))]
-[assembly: ExportRenderer(typeof(ProgressBar), typeof(ProgressBarRenderer))]
+[assembly: ExportRenderer (typeof (LinkLabel), typeof (LinkLabelRenderer))]
-[assembly: ExportRenderer(typeof(SearchBar), typeof(SearchBarRenderer))]
+[assembly: ExportRenderer (typeof (LinkView), typeof (LinkViewRenderer))]
-[assembly: ExportRenderer(typeof(Switch), typeof(SwitchRenderer))]
+[assembly: ExportRenderer (typeof (ProgressBar), typeof (ProgressBarRenderer))]
-[assembly: ExportRenderer(typeof(TimePicker), typeof(TimePickerRenderer))]
+[assembly: ExportRenderer (typeof (SearchBar), typeof (SearchBarRenderer))]
-[assembly: ExportImageSourceHandler(typeof(FileImageSource), typeof(FileImageSourceHandler))]
+[assembly: ExportRenderer (typeof (Switch), typeof (SwitchRenderer))]
-[assembly: ExportImageSourceHandler(typeof(StreamImageSource), typeof(StreamImagesourceHandler))]
+[assembly: ExportRenderer (typeof (TimePicker), typeof (TimePickerRenderer))]
-[assembly: ExportImageSourceHandler(typeof(UriImageSource), typeof(ImageLoaderSourceHandler))]
+[assembly: ExportImageSourceHandler (typeof (FileImageSource), typeof (FileImageSourceHandler))]
+[assembly: ExportImageSourceHandler (typeof (StreamImageSource), typeof (StreamImagesourceHandler))]
+[assembly: ExportImageSourceHandler (typeof (UriImageSource), typeof (ImageLoaderSourceHandler))]
 
 namespace Ooui.Forms
 {

Ooui.Forms/Ooui.Forms.csproj

@@ -24,6 +24,7 @@
   </ItemGroup>
   <ItemGroup>
     <Folder Include="Extensions\" />
+    <Folder Include="Controls\" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Ooui\Ooui.csproj" />

Ooui.Forms/Renderers/LinkLabelRenderer.cs

@@ -0,0 +1,165 @@
+using System;
+using System.ComponentModel;
+using Ooui.Forms.Extensions;
+using Xamarin.Forms;
+
+namespace Ooui.Forms.Renderers
+{
+    public class LinkLabelRenderer : ViewRenderer<LinkLabel, Anchor>
+    {
+        SizeRequest _perfectSize;
+
+        bool _perfectSizeValid;
+
+        public override SizeRequest GetDesiredSize (double widthConstraint, double heightConstraint)
+        {
+            if (!_perfectSizeValid) {
+                var size = Element.Text.MeasureSize (Element.FontFamily, Element.FontSize, Element.FontAttributes);
+                size.Width = Math.Ceiling (size.Width);
+                size.Height = Math.Ceiling (size.Height * 1.4);
+                _perfectSize = new SizeRequest (size, size);
+                _perfectSizeValid = true;
+            }
+
+            var widthFits = widthConstraint >= _perfectSize.Request.Width;
+            var heightFits = heightConstraint >= _perfectSize.Request.Height;
+
+            if (widthFits && heightFits)
+                return _perfectSize;
+
+            var result = base.GetDesiredSize (widthConstraint, heightConstraint);
+            var tinyWidth = Math.Min (10, result.Request.Width);
+            result.Minimum = new Size (tinyWidth, result.Request.Height);
+
+            if (widthFits || Element.LineBreakMode == LineBreakMode.NoWrap)
+                return result;
+
+            bool containerIsNotInfinitelyWide = !double.IsInfinity (widthConstraint);
+
+            if (containerIsNotInfinitelyWide) {
+                bool textCouldHaveWrapped = Element.LineBreakMode == LineBreakMode.WordWrap || Element.LineBreakMode == LineBreakMode.CharacterWrap;
+                bool textExceedsContainer = result.Request.Width > widthConstraint;
+
+                if (textExceedsContainer || textCouldHaveWrapped) {
+                    var expandedWidth = Math.Max (tinyWidth, widthConstraint);
+                    result.Request = new Size (expandedWidth, result.Request.Height);
+                }
+            }
+
+            return result;
+        }
+
+        protected override void OnElementChanged (ElementChangedEventArgs<Ooui.Forms.LinkLabel> e)
+        {
+            if (e.NewElement != null) {
+                if (Control == null) {
+                    SetNativeControl (new Anchor ());
+                }
+
+                UpdateHRef ();
+
+                UpdateText ();
+                UpdateTextColor ();
+                UpdateFont ();
+
+                UpdateLineBreakMode ();
+                UpdateAlignment ();
+            }
+
+            base.OnElementChanged (e);
+        }
+
+        protected override void OnElementPropertyChanged (object sender, PropertyChangedEventArgs e)
+        {
+            base.OnElementPropertyChanged (sender, e);
+
+            if (Control == null)
+                return;
+
+            if (e.PropertyName == Ooui.Forms.LinkLabel.HRefProperty.PropertyName)
+                UpdateHRef ();
+            else if (e.PropertyName == Xamarin.Forms.Label.HorizontalTextAlignmentProperty.PropertyName)
+                UpdateAlignment ();
+            else if (e.PropertyName == Xamarin.Forms.Label.VerticalTextAlignmentProperty.PropertyName)
+                UpdateAlignment ();
+            else if (e.PropertyName == Xamarin.Forms.Label.TextColorProperty.PropertyName)
+                UpdateTextColor ();
+            else if (e.PropertyName == Xamarin.Forms.Label.FontProperty.PropertyName)
+                UpdateFont ();
+            else if (e.PropertyName == Xamarin.Forms.Label.TextProperty.PropertyName)
+                UpdateText ();
+            else if (e.PropertyName == Xamarin.Forms.Label.FormattedTextProperty.PropertyName)
+                UpdateText ();
+            else if (e.PropertyName == Xamarin.Forms.Label.LineBreakModeProperty.PropertyName)
+                UpdateLineBreakMode ();
+        }
+
+        protected override void SetBackgroundColor (Xamarin.Forms.Color color)
+        {
+            if (color == Xamarin.Forms.Color.Default)
+                Style.BackgroundColor = Colors.Clear;
+            else
+                Style.BackgroundColor = color.ToOouiColor ();
+        }
+
+        void UpdateHRef ()
+        {
+            Control.HRef = Element.HRef;
+        }
+
+        void UpdateAlignment ()
+        {
+            this.Style.Display = "table";
+            Control.Style.Display = "table-cell";
+            this.Style.TextAlign = Element.HorizontalTextAlignment.ToOouiTextAlign ();
+            Control.Style.VerticalAlign = Element.VerticalTextAlignment.ToOouiVerticalAlign ();
+        }
+
+        void UpdateLineBreakMode ()
+        {
+            _perfectSizeValid = false;
+        }
+
+        bool isTextFormatted;
+        void UpdateText ()
+        {
+            _perfectSizeValid = false;
+
+            var values = Element.GetValues (Xamarin.Forms.Label.FormattedTextProperty, Xamarin.Forms.Label.TextProperty, Xamarin.Forms.Label.TextColorProperty);
+            var formatted = values[0] as FormattedString;
+            if (formatted != null) {
+                Control.Text = (string)values[1];
+                isTextFormatted = true;
+            }
+            else {
+                Control.Text = (string)values[1];
+                isTextFormatted = false;
+            }
+        }
+
+        void UpdateFont ()
+        {
+            if (isTextFormatted)
+                return;
+            _perfectSizeValid = false;
+
+            Element.SetStyleFont (Element.FontFamily, Element.FontSize, Element.FontAttributes, Control.Style);
+        }
+
+        void UpdateTextColor ()
+        {
+            if (isTextFormatted)
+                return;
+
+            _perfectSizeValid = false;
+
+            var textColor = Element.TextColor;
+            if (textColor.IsDefault) {
+                Control.Style.Color = null;
+            }
+            else {
+                Control.Style.Color = textColor.ToOouiColor (Xamarin.Forms.Color.Black);
+            }
+        }
+    }
+}

Ooui.Forms/Renderers/LinkViewRenderer.cs

@@ -0,0 +1,36 @@
+using System;
+using System.ComponentModel;
+
+namespace Ooui.Forms.Renderers
+{
+    public class LinkViewRenderer : ViewRenderer<LinkView, Ooui.Anchor>
+    {
+        public LinkViewRenderer ()
+            : base ("a")
+        {
+        }
+
+        protected override void OnElementChanged (ElementChangedEventArgs<LinkView> e)
+        {
+            base.OnElementChanged (e);
+
+            UpdateHRef ();
+        }
+
+        protected override void OnElementPropertyChanged (object sender, PropertyChangedEventArgs e)
+        {
+            base.OnElementPropertyChanged (sender, e);
+
+            if (Control == null)
+                return;
+
+            if (e.PropertyName == Ooui.Forms.LinkLabel.HRefProperty.PropertyName)
+                UpdateHRef ();
+        }
+
+        void UpdateHRef ()
+        {
+            this.SetAttribute ("href", Element.HRef);
+        }
+    }
+}

Ooui.Forms/Renderers/ViewRenderer.cs

@@ -15,11 +15,16 @@ namespace Ooui.Forms.Renderers
 
 		public TNativeElement Control { get; private set; }
 
-		/// <summary>
+        /// <summary>
-		/// Determines whether the native control is disposed of when this renderer is disposed
+        /// Determines whether the native control is disposed of when this renderer is disposed
-		/// Can be overridden in deriving classes 
+        /// Can be overridden in deriving classes 
-		/// </summary>
+        /// </summary>
-		protected virtual bool ManageNativeControlLifetime => true;
+        protected virtual bool ManageNativeControlLifetime => true;
+
+        public ViewRenderer (string tagName = "div")
+            : base (tagName)
+        {
+        }
 
 		protected override void Dispose (bool disposing)
 		{

Ooui.Forms/VisualElementRenderer.cs

@@ -62,7 +62,7 @@ namespace Ooui.Forms
             }
         }
 
-        public VisualElementRenderer () : base ("div")
+        public VisualElementRenderer (string tagName = "div") : base (tagName)
         {
             _propertyChangedHandler = OnElementPropertyChanged;
         }

Ooui/Anchor.cs

@@ -0,0 +1,18 @@
+using System;
+
+namespace Ooui
+{
+    public class Anchor : Element
+    {
+        string href = "";
+        public string HRef {
+            get => href;
+            set => SetProperty (ref href, value ?? "", "href");
+        }
+
+        public Anchor ()
+            : base ("a")
+        {
+        }
+    }
+}

Samples/DisplayAlertPage.xaml

@@ -1,11 +1,18 @@
 <?xml version="1.0" encoding="utf-8" ?>
 <ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
              xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             xmlns:ooui="clr-namespace:Ooui.Forms;assembly=Ooui.Forms"
              x:Class="Samples.DisplayAlertPage">
     <ContentPage.Content>
         <StackLayout>
             <Label Text="Welcome to DisplayAlert Sample!" FontSize="32" FontAttributes="Bold" Margin="10,10,10,50"
-                HorizontalOptions="Center"/>
+                HorizontalOptions="Center" />
+            <ooui:LinkLabel Text="Link to Xamarin.Forms docs"
+                HRef="https://developer.xamarin.com/guides/xamarin-forms/" />
+            <ooui:LinkView
+                HRef="https://developer.xamarin.com/guides/xamarin-forms/">
+                <BoxView Color="Gray" HeightRequest="16" />
+            </ooui:LinkView>
             <ActivityIndicator x:Name="activity" />
             <ProgressBar x:Name="progress" />
             <DatePicker x:Name="datePicker" />