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