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CustomRenderers.cs
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CustomRenderers.cs
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using System;
using System.ComponentModel;
using System.Linq;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Shapes;
using Xamarin.Forms.ControlGallery.WindowsUniversal;
using Xamarin.Forms.Controls.Issues;
using Xamarin.Forms.Platform.UWP;
using WEllipse = Windows.UI.Xaml.Shapes.Ellipse;
using WShape = Windows.UI.Xaml.Shapes.Shape;
using WSolidColorBrush = Windows.UI.Xaml.Media.SolidColorBrush;
[assembly: ExportRenderer(typeof(Xamarin.Forms.Controls.Issues.Bugzilla42602.TextBoxView), typeof(Xamarin.Forms.ControlGallery.WindowsUniversal.TextBoxViewRenderer))]
[assembly: ExportRenderer(typeof(Issue1683.EntryKeyboardFlags), typeof(EntryRendererKeyboardFlags))]
[assembly: ExportRenderer(typeof(Issue1683.EditorKeyboardFlags), typeof(EditorRendererKeyboardFlags))]
[assembly: ExportRenderer(typeof(Issue3273.SortableListView), typeof(SortableListViewRenderer))]
[assembly: ExportRenderer(typeof(Issue2172OldEntry), typeof(Issue2172OldEntryRenderer))]
[assembly: ExportRenderer(typeof(Issue2172OldEditor), typeof(Issue2172OldEditorRenderer))]
namespace Xamarin.Forms.ControlGallery.WindowsUniversal
{
public class EntryRendererKeyboardFlags : EntryRenderer
{
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
Control.SetKeyboardFlags(((Issue1683.EntryKeyboardFlags)Element).FlagsToSet);
Control.TestKeyboardFlags(((Issue1683.EntryKeyboardFlags)Element).FlagsToSet);
}
}
public class EditorRendererKeyboardFlags : EditorRenderer
{
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
Control.SetKeyboardFlags(((Issue1683.EditorKeyboardFlags)Element).FlagsToSet);
Control.TestKeyboardFlags(((Issue1683.EditorKeyboardFlags)Element).FlagsToSet);
}
}
public class SortableListViewRenderer : ListViewRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<ListView> e)
{
base.OnElementChanged(e);
if (e.NewElement != null)
{
var control = Control as Windows.UI.Xaml.Controls.ListView;
control.AllowDrop = true;
control.CanDragItems = true;
control.CanReorderItems = true;
control.ReorderMode = ListViewReorderMode.Enabled;
}
}
}
public static class KeyboardFlagExtensions
{
public static void TestKeyboardFlags(this FormsTextBox Control, KeyboardFlags? flags)
{
if (flags == null) { return; }
if (flags.Value.HasFlag(KeyboardFlags.CapitalizeSentence))
{
if (!Control.IsSpellCheckEnabled)
{
throw new System.Exception("IsSpellCheckEnabled not enabled");
}
}
else if (flags.Value.HasFlag(KeyboardFlags.CapitalizeWord))
{
if (!Control.InputScope.Names.Select(x => x.NameValue).Contains(InputScopeNameValue.NameOrPhoneNumber))
{
throw new System.Exception("Input Scope Not Set to NameOrPhoneNumber");
}
if (!Control.IsSpellCheckEnabled)
{
throw new System.Exception("IsSpellCheckEnabled not enabled");
}
}
else
{
return;
}
}
public static void SetKeyboardFlags(this FormsTextBox Control, KeyboardFlags? flags)
{
if (flags == null) { return; }
var result = new InputScope();
var value = InputScopeNameValue.Default;
if (flags.Value.HasFlag(KeyboardFlags.CapitalizeSentence))
{
Control.IsSpellCheckEnabled = true;
}
else if (flags.Value.HasFlag(KeyboardFlags.CapitalizeWord))
{
value = InputScopeNameValue.NameOrPhoneNumber;
Control.IsSpellCheckEnabled = true;
}
else
{
return;
}
InputScopeName nameValue = new InputScopeName();
nameValue.NameValue = value;
result.Names.Add(nameValue);
Control.InputScope = result;
}
}
public class TextBoxViewRenderer : BoxViewBorderRenderer
{
Canvas m_Canvas;
protected override void OnElementChanged(ElementChangedEventArgs<BoxView> e)
{
base.OnElementChanged(e);
ArrangeNativeChildren = true;
if (m_Canvas != null)
Children.Remove(m_Canvas);
m_Canvas = new Canvas()
{
Width = 200,
Height = 200,
Background = new WSolidColorBrush(Windows.UI.Color.FromArgb(0, 255, 255, 255)),
IsHitTestVisible = false
};
Children.Add(m_Canvas);
//ellipse
WShape ellipse = new WEllipse()
{
Width = 100,
Height = 100,
Fill = new WSolidColorBrush(Windows.UI.Color.FromArgb(255, 255, 0, 0)),
};
Canvas.SetLeft(ellipse, 0);
Canvas.SetTop(ellipse, 0);
m_Canvas.Children.Add(ellipse);
//text
TextBlock text = new TextBlock()
{
FontSize = 50,
FontWeight = Windows.UI.Text.FontWeights.Normal,
Text = "hello world",
Foreground = new WSolidColorBrush(Windows.UI.Color.FromArgb(255, 255, 0, 0))
};
Canvas.SetLeft(text, 0);
Canvas.SetTop(text, 150);
m_Canvas.Children.Add(text);
}
}
public class Issue2172OldEntryRenderer : EntryRenderer
{
public override SizeRequest GetDesiredSize(double widthConstraint, double heightConstraint)
{
if (Children.Count == 0 || Control == null)
return new SizeRequest();
var constraint = new Windows.Foundation.Size(widthConstraint, heightConstraint);
FormsTextBox child = Control;
child.Measure(constraint);
var result = new Size(Math.Ceiling(child.DesiredSize.Width), Math.Ceiling(child.DesiredSize.Height));
return new SizeRequest(result);
}
}
public class Issue2172OldEditorRenderer : EditorRenderer
{
static FormsTextBox _copyOfTextBox;
static Windows.Foundation.Size _zeroSize = new Windows.Foundation.Size(0, 0);
FormsTextBox CreateTextBox()
{
return new FormsTextBox
{
AcceptsReturn = true,
TextWrapping = TextWrapping.Wrap,
Style = Windows.UI.Xaml.Application.Current.Resources["FormsTextBoxStyle"] as Windows.UI.Xaml.Style
};
}
/*
* Purely invalidating the layout as text is added to the TextBox will not cause it to expand.
* If the TextBox is set to WordWrap and it is part of the layout it will refuse to Measure itself beyond its established width.
* Even giving it infinite constraints will cause it to always set its DesiredSize to the same width but with a vertical growth.
* The only way I was able to grow it was by setting layout renderers width explicitly to some value but then it just set its own Width to that Width which is not helpful.
* Even vertically it would measure oddly in cases of rapid text changes.
* Holding down the backspace key or enter key would cause the final result to be not quite right.
* Both of these issues were fixed by just creating a static TextBox that is not part of the layout which let me just measure
* the size of the text as it would fit into the TextBox unconstrained and then just return that Size from the GetDesiredSize call.
* */
Size GetCopyOfSize(FormsTextBox control, Windows.Foundation.Size constraint)
{
if (_copyOfTextBox == null)
{
_copyOfTextBox = CreateTextBox();
// This causes the copy to be initially setup correctly.
// I found that if the first measure of this copy occurs with Text then it will just keep defaulting to a measure with no text.
_copyOfTextBox.Measure(_zeroSize);
}
_copyOfTextBox.Text = control.Text;
_copyOfTextBox.FontSize = control.FontSize;
_copyOfTextBox.FontFamily = control.FontFamily;
_copyOfTextBox.FontStretch = control.FontStretch;
_copyOfTextBox.FontStyle = control.FontStyle;
_copyOfTextBox.FontWeight = control.FontWeight;
_copyOfTextBox.Margin = control.Margin;
_copyOfTextBox.Padding = control.Padding;
// have to reset the measure to zero before it will re-measure itself
_copyOfTextBox.Measure(_zeroSize);
_copyOfTextBox.Measure(constraint);
Size result = new Size
(
Math.Ceiling(_copyOfTextBox.DesiredSize.Width),
Math.Ceiling(_copyOfTextBox.DesiredSize.Height)
);
return result;
}
SizeRequest CalculateDesiredSizes(FormsTextBox control, Windows.Foundation.Size constraint, EditorAutoSizeOption sizeOption)
{
if (sizeOption == EditorAutoSizeOption.TextChanges)
{
Size result = GetCopyOfSize(control, constraint);
control.Measure(constraint);
return new SizeRequest(result);
}
else
{
control.Measure(constraint);
Size result = new Size(Math.Ceiling(control.DesiredSize.Width), Math.Ceiling(control.DesiredSize.Height));
return new SizeRequest(result);
}
}
public override SizeRequest GetDesiredSize(double widthConstraint, double heightConstraint)
{
FormsTextBox child = Control;
if (Children.Count == 0 || child == null)
return new SizeRequest();
return CalculateDesiredSizes(child, new Windows.Foundation.Size(widthConstraint, heightConstraint), Element.AutoSize);
}
}
}