public T GetPage <T>(NavPageType pageType, string title = null, Subject subject = null)
{
try
{
Page page;
if (pageType != NavPageType.SubjectPage &&
pageType != NavPageType.DefinitionsPage &&
pageType != NavPageType.FormulasPage &&
pageType != NavPageType.SolverPage &&
pageType != NavPageType.SearchPage)
{
page = GetMainPage(pageType);
}
else
{
page = GetPageForSubject(pageType, subject);
}
if (!string.IsNullOrWhiteSpace(title) && page.Title != title)
{
page.Title = title;
}
if (page != null)
{
return((T)(object)page);
}
}
catch (Exception e)
{
Debug.WriteLine(e);
}
return(default(T));
}
private async void NavigateTo(NavPageType pageType, string title = null, bool inner = true, Subject subject = null)
{
var newPage = GetPage <Page>(pageType, title, subject);
if (newPage != null)
{
_isOnMain = pageType == NavPageType.MainPage || pageType == NavPageType.AboutPage;
_lastType = pageType;
if (inner)
{
await NavPage.PushAsync(newPage);
}
else
{
NavPage = new NavigationPage(newPage)
{
Title = newPage.Title,
BarBackgroundColor = _topBarColor,
BarTextColor = _topBarTextColor,
BackgroundColor = _mainBgColor
};
_mdp.Detail = NavPage;
}
_mdp.IsPresented = false;
}
}
public override void NavigateToSearchPage(NavPageType callingPage, Subject subject)
{
var title = "Wyszukaj " + (callingPage == NavPageType.DefinitionsPage ? "Definicje" : "Wzory");
SearchPage.SearchFilter = callingPage;
NavigateTo(NavPageType.SearchPage, title, true, subject);
}
private Page CreatePage(NavPageType pageType, Subject subject = null)
{
Page page;
Type type;
switch (pageType)
{
case NavPageType.MainPage:
type = typeof(MainPage);
break;
case NavPageType.AboutPage:
type = typeof(AboutPage);
break;
case NavPageType.SubjectsPage:
type = typeof(SubjectsPage);
break;
case NavPageType.SubjectPage:
type = typeof(SubjectPage);
break;
case NavPageType.DefinitionsPage:
type = typeof(DefinitionsPage);
break;
case NavPageType.FormulasPage:
type = typeof(FormulasPage);
break;
case NavPageType.SolverPage:
type = typeof(SolverPage);
break;
case NavPageType.SearchPage:
type = typeof(SearchPage);
break;
default:
throw new ArgumentOutOfRangeException(nameof(pageType), pageType, null);
}
if (subject == null)
{
page = Activator.CreateInstance(type) as Page;
MainPages.Add(pageType, page);
}
else
{
page = Activator.CreateInstance(type, subject) as Page;
var subjectType = subject.Base.SubjectType;
SubjectPages[subjectType].Add(pageType, page);
}
return(page);
}
/*private T GetPageForSubject<T>(NavPageType pageType, Subject subject)
* {
* var page = GetPageForSubject(pageType, subject);
* if (page != null)
* {
* return (T)Convert.ChangeType(page, typeof(T));
* }
* return default(T);
* }*/
private Page GetPageForSubject(NavPageType pageType, Subject subject)
{
if (!SubjectPages.ContainsKey(subject.Base.SubjectType) ||
!SubjectPages[subject.Base.SubjectType].ContainsKey(pageType))
{
CreatePage(pageType, subject);
}
var page = SubjectPages[subject.Base.SubjectType][pageType];
return(page);
}
public abstract void NavigateToSearchPage(NavPageType callingPage, Subject subject);
public abstract void NavigateToMain(NavPageType pageType, string title);
private Page GetMainPage(NavPageType pageType)
{
return(!MainPages.ContainsKey(pageType) ? CreatePage(pageType) : MainPages[pageType]);
}
public override void NavigateToMain(NavPageType pageType, string title)
{
NavigateTo(pageType, "AiRTech", false);
}
