110 строки
3.4 KiB
C#
110 строки
3.4 KiB
C#
// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409
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using System;
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using Windows.Foundation;
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using Windows.Graphics.Display;
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using Windows.UI.ViewManagement;
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using Windows.UI.Xaml;
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using Windows.UI.Xaml.Controls;
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using Windows.UI.Xaml.Media;
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using Xamarin.Forms.Controls;
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using Xamarin.Forms.Platform.UWP;
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namespace Xamarin.Forms.ControlGallery.WindowsUniversal
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{
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/// <summary>
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/// An empty page that can be used on its own or navigated to within a Frame.
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/// </summary>
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public sealed partial class MainPage
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{
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public MainPage()
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{
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InitializeComponent();
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var app = new Controls.App ();
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var mdp = app.MainPage as MasterDetailPage;
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var detail = mdp?.Detail as NavigationPage;
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if (detail != null) {
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detail.Pushed += (sender, args) => {
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var nncgPage = args.Page as NestedNativeControlGalleryPage;
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if (nncgPage != null) {
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AddNativeControls (nncgPage);
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}
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};
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}
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LoadApplication (app);
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}
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void AddNativeControls (NestedNativeControlGalleryPage page)
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{
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if (page.NativeControlsAdded) {
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return;
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}
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StackLayout sl = page.Layout;
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// Create and add a native TextBlock
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var originalText = "I am a native TextBlock";
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var textBlock = new TextBlock {
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Text = originalText,
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FontSize = 14,
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FontFamily = new FontFamily ("HelveticaNeue")
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};
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sl?.Children.Add (textBlock);
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// Create and add a native Button
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var button = new Windows.UI.Xaml.Controls.Button { Content = "Toggle Font Size", Height = 80 };
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button.Click += (sender, args) => { textBlock.FontSize = textBlock.FontSize == 14 ? 24 : 14; };
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sl?.Children.Add (button.ToView ());
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// Create a control which we know doesn't behave correctly with regard to measurement
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var difficultControl = new BrokenNativeControl {
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Text = "Not Sized/Arranged Properly"
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};
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var difficultControl2 = new BrokenNativeControl {
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Text = "Fixed"
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};
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// Add the misbehaving controls, one with a custom delegate for ArrangeOverrideDelegate
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sl?.Children.Add (difficultControl);
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sl?.Children.Add (difficultControl2,
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arrangeOverrideDelegate: (renderer, finalSize) => {
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if (finalSize.Width <= 0 || double.IsInfinity (finalSize.Width)) {
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return null;
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}
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FrameworkElement frameworkElement = renderer.Control;
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frameworkElement.Measure (finalSize);
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// The broken control always tries to size itself to the screen width
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// So figure that out and we'll know how far off it's laying itself out
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Rect bounds = ApplicationView.GetForCurrentView ().VisibleBounds;
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double scaleFactor = DisplayInformation.GetForCurrentView ().RawPixelsPerViewPixel;
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var screenWidth = new Size (bounds.Width * scaleFactor, bounds.Height * scaleFactor);
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// We can re-center it by offsetting it during the Arrange call
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double diff = Math.Abs(screenWidth.Width - finalSize.Width) / -2;
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frameworkElement.Arrange (new Rect (diff, 0, finalSize.Width - diff, finalSize.Height));
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// Arranging the control to the left will make it show up past the edge of the stack layout
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// We can fix that by clipping it manually
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var clip = new RectangleGeometry { Rect = new Rect (-diff, 0, finalSize.Width, finalSize.Height) };
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frameworkElement.Clip = clip;
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return finalSize;
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}
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);
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page.NativeControlsAdded = true;
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}
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}
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}
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