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DetailPage.xaml.cs
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DetailPage.xaml.cs
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// ---------------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// The MIT License (MIT)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// ---------------------------------------------------------------------------------
using RssReader.Common;
using RssReader.ViewModels;
using Windows.UI.Core;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Media.Animation;
using Windows.UI.Xaml.Navigation;
namespace RssReader.Views
{
public sealed partial class DetailPage : Page
{
private MainViewModel ViewModel => AppShell.Current.ViewModel;
public DetailPage()
{
InitializeComponent();
ArticleWebView.NavigationStarting += async (s, e) =>
await e.LaunchBrowserForNonMatchingUriAsync(ViewModel.CurrentArticle.Link);
ArticleWebView.LoadCompleted += (s, e) => ArticleWebView.Visibility = Visibility.Visible;
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
base.OnNavigatedTo(e);
if (ViewModel.CurrentArticle != null)
{
if (!ViewModel.CurrentArticle.Link.IsEquivalentTo(ArticleWebView.Source))
{
ArticleWebView.Navigate(ViewModel.CurrentArticle.Link);
}
else
{
ArticleWebView.Visibility = Visibility.Visible;
}
}
var backStack = Frame.BackStack;
var backStackCount = backStack.Count;
if (backStackCount > 0)
{
var masterPageEntry = backStack[backStackCount - 1];
backStack.RemoveAt(backStackCount - 1);
// Clear the navigation parameter so that navigation back to the
// MasterDetail page won't reset the current article selection.
var modifiedEntry = new PageStackEntry(
masterPageEntry.SourcePageType,
null,
masterPageEntry.NavigationTransitionInfo
);
backStack.Add(modifiedEntry);
}
// Register for hardware and software back request from the system
SystemNavigationManager systemNavigationManager = SystemNavigationManager.GetForCurrentView();
systemNavigationManager.BackRequested += DetailPage_BackRequested;
systemNavigationManager.AppViewBackButtonVisibility = AppViewBackButtonVisibility.Visible;
ViewModel.IsInDetailsMode = true;
}
protected override void OnNavigatedFrom(NavigationEventArgs e)
{
base.OnNavigatedFrom(e);
SystemNavigationManager systemNavigationManager = SystemNavigationManager.GetForCurrentView();
systemNavigationManager.BackRequested -= DetailPage_BackRequested;
systemNavigationManager.AppViewBackButtonVisibility = AppViewBackButtonVisibility.Collapsed;
ViewModel.IsInDetailsMode = false;
ArticleWebView.Visibility = Visibility.Collapsed;
}
private void OnBackRequested()
{
// Page above us will be our master view.
// Make sure we are using the "drill out" animation in this transition.
if (Frame.CanGoBack) Frame.GoBack(new DrillInNavigationTransitionInfo());
}
void NavigateBackForWideState(bool useTransition)
{
if (useTransition)
{
Frame.GoBack(new EntranceNavigationTransitionInfo());
}
else
{
Frame.GoBack(new SuppressNavigationTransitionInfo());
}
}
private bool ShouldGoToWideState()
{
return Window.Current.Bounds.Width >= 720;
}
private void PageRoot_Loaded(object sender, RoutedEventArgs e)
{
if (ShouldGoToWideState())
{
// We shouldn't see this page since we are in "wide master-detail" mode.
// Play a transition as we are navigating from a separate page.
NavigateBackForWideState(useTransition: true);
}
Window.Current.SizeChanged += Window_SizeChanged;
}
private void PageRoot_Unloaded(object sender, RoutedEventArgs e)
{
Window.Current.SizeChanged -= Window_SizeChanged;
}
private void Window_SizeChanged(object sender, Windows.UI.Core.WindowSizeChangedEventArgs e)
{
if (ShouldGoToWideState())
{
// Make sure we are no longer listening to window change events.
Window.Current.SizeChanged -= Window_SizeChanged;
// We shouldn't see this page since we are in "wide master-detail" mode.
NavigateBackForWideState(useTransition: false);
}
}
private void DetailPage_BackRequested(object sender, BackRequestedEventArgs e)
{
// Mark event as handled so we don't get bounced out of the app.
e.Handled = true;
OnBackRequested();
}
}
}