Ooui-tws-port/Samples/XamlPreviewPageSample.cs

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C#
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using System;
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using System.Threading;
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using Xamarin.Forms;
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using Xamarin.Forms.Xaml;
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namespace Samples
{
public class XamlPreviewPageSample : ISample
{
public string Title => "Xamarin.Forms XAML Editor";
public Ooui.Element CreateElement ()
{
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var page = new XamlEditorPage ();
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return page.GetOouiElement ();
}
}
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public partial class XamlEditorPage : ContentPage
{
Editor editor;
ContentView results;
public XamlEditorPage ()
{
InitializeComponent ();
editor.Text = @"<ContentView
xmlns=""http://xamarin.com/schemas/2014/forms""
xmlns:x=""http://schemas.microsoft.com/winfx/2009/xaml"">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height=""*"" />
<RowDefinition Height=""*"" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width=""*"" />
<ColumnDefinition Width=""*"" />
</Grid.ColumnDefinitions>
<StackLayout Grid.Row=""0"" Grid.Column=""0"">
<Label Text=""Top Left"" />
<Entry Placeholder=""I'm ready for some text"" />
<Button Text=""I'm a button, but I don't do anything"" />
</StackLayout>
<Label Text=""Top Right"" Grid.Row=""0"" Grid.Column=""1"" TextColor=""White"" BackgroundColor=""#c5000b"" />
<Label Text=""Bottom Left"" Grid.Row=""1"" Grid.Column=""0"" TextColor=""Black"" BackgroundColor=""#ffd320"" />
<Label Text=""Bottom Right"" Grid.Row=""1"" Grid.Column=""1"" TextColor=""White"" BackgroundColor=""#008000"" />
</Grid>
</ContentView>";
editor.TextChanged += (sender, e) => DisplayXaml ();
DisplayXaml ();
}
void InitializeComponent ()
{
var grid = new Grid ();
grid.RowDefinitions.Add (new RowDefinition { Height = GridLength.Auto });
grid.RowDefinitions.Add (new RowDefinition { Height = GridLength.Star });
grid.ColumnDefinitions.Add (new ColumnDefinition { Width = GridLength.Star });
grid.ColumnDefinitions.Add (new ColumnDefinition { Width = GridLength.Star });
editor = new Editor {
FontSize = 12,
FontFamily = "monospace",
};
editor.SetValue (Grid.ColumnProperty, 0);
editor.SetValue (Grid.RowProperty, 1);
results = new ContentView ();
results.SetValue (Grid.ColumnProperty, 1);
results.SetValue (Grid.RowProperty, 1);
var title = new Label {
Text = "XAML Editor",
FontSize = 24,
FontAttributes = FontAttributes.Bold,
Margin = new Thickness (8),
};
title.SetValue (Grid.ColumnProperty, 0);
title.SetValue (Grid.RowProperty, 0);
grid.Children.Add (title);
grid.Children.Add (editor);
grid.Children.Add (results);
Content = grid;
}
CancellationTokenSource lastCts = null;
public void DisplayXaml ()
{
try {
var cts = new CancellationTokenSource ();
var token = cts.Token;
lastCts?.Cancel ();
lastCts = cts;
var contentView = new ContentView ();
contentView.LoadFromXaml (editor.Text);
if (!token.IsCancellationRequested) {
results.Content = contentView;
}
}
catch (OperationCanceledException) {
}
catch (Exception ex) {
results.Content = new Label {
TextColor = Color.DarkRed,
FontSize = 12,
Text = ex.ToString (),
};
}
}
}
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}