140 lines
3.6 KiB
C#
140 lines
3.6 KiB
C#
using System;
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using Xamarin.Forms;
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namespace MobileApp1.Views
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{
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public class ContentPageHelper
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{
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public static App GetApp(ContentPage view) => (App)GetParentElement<App>(view);
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//{
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// if (view == null) return null;
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// Element item = view.Parent;
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// while (true)
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// {
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// if (item == null) break;
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// if (item is App) break;
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// item = item.Parent;
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// }
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// return (item as App);
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//}
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public static Application GetApplication(ContentPage view) => (Application)GetParentElement<Application>(view);
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//{
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// if (view == null) return null;
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// Element item = view.Parent;
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// while (true)
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// {
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// if (item == null) break;
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// if (item is Application) break;
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// item = item.Parent;
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// }
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// return (item as Application);
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// }
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public static MainPage GetMainPage(ContentPage view) => (MainPage)GetParentElement<MainPage>(view);
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public static object GetParentElement<T>(ContentPage view)
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{
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if (view == null) return default(T);
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Element item = view.Parent;
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while (true)
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{
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if (item == null) break;
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if (item is T) break;
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item = item.Parent;
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}
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//try
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//{
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// return (T)Convert.ChangeType(item, typeof(T));
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//}
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//catch (InvalidCastException)
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//{
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// return default(T);
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//}
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return item;
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}
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public static void SetDetailPage(ContentPage view, Type pageType, bool useNavigationPage = true) => SetDetailPage(view, (Page)Activator.CreateInstance(pageType), useNavigationPage);
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public static void SetDetailPage(ContentPage view, Page page, bool useNavigationPage = true)
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{
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if (view == null) return;
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if (view.Parent == null) return;
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if (page == null) return;
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MainPage rs = GetMainPage(view);
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if (rs == null)
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{
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return;
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}
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Device.BeginInvokeOnMainThread(() =>
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{
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if (useNavigationPage)
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{
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rs.Detail = new NavigationPage(page);
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}
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else
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{
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rs.Detail = page;
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}
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});
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}
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public static void SetMainPage(ContentPage view, Page page, bool useNavigationPage = false)
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{
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if (view == null) return;
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if (view.Parent == null) return;
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if (page == null) return;
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Application rs = GetApplication(view);
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if (rs == null)
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{
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return;
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}
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Device.BeginInvokeOnMainThread(() =>
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{
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if (useNavigationPage)
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{
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rs.MainPage = new NavigationPage(page);
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}
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else
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{
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rs.MainPage = page;
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}
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});
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}
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public static async void PushMainPageNavigation(ContentPage view, Page page)
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{
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if (view == null) return;
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if (view.Parent == null) return;
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if (page == null) return;
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Application rs = GetApplication(view);
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if (rs == null)
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{
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return;
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}
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await rs?.MainPage.Navigation.PushAsync(page);
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}
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}
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}
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