static IEnumerable <ElementInfo> FindInTitle(Element element, Predicate <Element> predicate, Predicate <Element> containerPredicate)
{
var result = new List <ElementInfo>();
IEnumerable <ElementInfo> empty = new List <ElementInfo>();
View titleView = null;
if (element is Page && element.Parent is TabbedPage && TitleViewIsVisible(element.Parent))
{
titleView = NavigationPage.GetTitleView(element.Parent as Page);
}
else if (TitleViewIsVisible(element))
{
titleView = NavigationPage.GetTitleView(element as Page);
}
if (titleView != null)
{
result.AddRange(titleView.Find(predicate, containerPredicate) ?? empty);
}
else
{
result.AddRange((element as Page)?.ToolbarItems.ToList().Where(predicate.Invoke).Select(ElementInfo.FromElement) ?? empty);
}
return(result);
}
public PopularesPage()
{
InitializeComponent();
_currentNavigationView = NavigationPage.GetTitleView(this);
IconImageSource = ImageSource.FromResource("Pokedex.imagesTab.promocaoTabble.png");
SetPokemonPopularesList();
}
protected override void OnAppearing()
{
base.OnAppearing();
Load();
TitleView = NavigationPage.GetTitleView(this);
ViewModel.ViewModelNavigation = TitleView.BindingContext as NavigationAnimalViewModel;
}
void UpdateTitleView()
{
AToolbar bar = Toolbar;
if (bar == null)
{
return;
}
Page currentPage = CurrentPage;
if (currentPage == null)
{
return;
}
VisualElement titleView = NavigationPage.GetTitleView(currentPage);
if (_titleViewHandler != null)
{
var reflectableType = _titleViewHandler as System.Reflection.IReflectableType;
var rendererType = reflectableType != null?reflectableType.GetTypeInfo().AsType() : _titleViewHandler.GetType();
if (titleView == null || Internals.Registrar.Registered.GetHandlerTypeForObject(titleView) != rendererType)
{
if (_titleView != null)
{
_titleView.Child = null;
}
_titleViewHandler.VirtualView.Handler = null;
_titleViewHandler = null;
}
}
if (titleView == null)
{
return;
}
if (_titleViewHandler != null)
{
_titleViewHandler.SetVirtualView(titleView);
}
else
{
titleView.ToNative(MauiContext);
_titleViewHandler = titleView.Handler;
if (_titleView == null)
{
_titleView = new Container(NavigationLayout.Context);
bar.AddView(_titleView);
}
_titleView.Child = (INativeViewHandler)_titleViewHandler;
}
}
static bool TitleViewIsVisible(Element element)
{
if (element?.FindParent <NavigationPage>() == null)
{
return(false);
}
var page = element as Page ?? new Page();
return(NavigationPage.GetTitleView(page) != null);
}
public void TitleViewSetProperty()
{
var root = new ContentPage();
var nav = new NavigationPage(root);
View target = new View();
NavigationPage.SetTitleView(root, target);
var result = NavigationPage.GetTitleView(root);
Assert.AreSame(result, target);
}
protected override void OnAppearing()
{
base.OnAppearing();
var bc = (ClientsViewModel)BindingContext;
if (bc != null)
{
if (bc.IsEditing)
{
(NavigationPage.GetTitleView(this) as NavTitleView).SubTitle = "Edito " + bc.SelectedClient.Name;
}
}
}
/// <summary>
/// The OnCurrentPageChanged
/// </summary>
/// <param name="sender">The sender<see cref="object"/></param>
/// <param name="e">The e<see cref="EventArgs"/></param>
private void OnCurrentPageChanged(object sender, EventArgs e)
{
if (CurrentPage == null)
{
return;
}
var titleView = NavigationPage.GetTitleView(CurrentPage);
if (titleView != null)
{
NavigationPage.SetTitleView(this, titleView);
}
}
static void changeTitleView(Page page)
{
var currentView = NavigationPage.GetTitleView(page);
if (currentView is Grid)
{
NavigationPage.SetTitleView(page, createSearchBarView());
}
else if (currentView is SearchBar)
{
NavigationPage.SetTitleView(page, null);
}
else
{
NavigationPage.SetTitleView(page, createGrid());
}
}
void changeTitleView_Clicked(object sender, EventArgs e)
{
var currentView = NavigationPage.GetTitleView(Navigation.NavigationStack.Last());
if (currentView is Grid)
{
NavigationPage.SetTitleView(Navigation.NavigationStack.Last(), createSearchBarView());
}
else if (currentView is SearchBar)
{
NavigationPage.SetTitleView(Navigation.NavigationStack.Last(), null);
}
else
{
NavigationPage.SetTitleView(Navigation.NavigationStack.Last(), createGrid());
}
}
static string GetTitle(ContentPage page)
{
var navigation = page?.Navigation;
if (navigation == null)
{
return(""); // without navigation the user can't see the title
}
var titleView = NavigationPage.GetTitleView(page);
if (titleView != null)
{
return($"*{RenderContent(titleView).Replace("\n", "").Replace("· ", " ").Replace(" ", "")} *");
}
var title = navigation.NavigationStack.LastOrDefault()?.Title;
return(title + " " + string.Join(" ", page.ToolbarItems.Select(t => $"[{t.Text}]")));
}
public NavigationBarGallery(NavigationPage rootNavPage)
{
_rootNavPage = rootNavPage;
int toggleBarTextColor = 0;
int toggleBarBackgroundColor = 0;
ToolbarItems.Add(new ToolbarItem {
Text = "Save"
});
NavigationPage.SetTitleIconImageSource(this, "coffee.png");
SearchBar searchBar = new SearchBar {
HeightRequest = 44, WidthRequest = 100
};
// Note: Large and complex controls, such as ListView and TableView, are not recommended.
var controls = new List <View>
{
searchBar,
new ActivityIndicator {
IsRunning = true
},
new BoxView {
BackgroundColor = Colors.Red
},
new Button {
Text = "Button!"
},
new DatePicker {
},
new Editor {
Text = "Editor"
},
new Entry {
Placeholder = "Entry"
},
new Image {
Source = "crimson.jpg", HeightRequest = 44
},
new Label {
Text = "Title View Label!"
},
new Picker {
ItemsSource = Enumerable.Range(0, 10).Select(i => $"Item {i}").ToList(), Title = "Picker"
},
new ProgressBar {
Progress = 50
},
new Slider {
},
new Stepper {
},
new Switch {
},
new TimePicker {
}
};
int idx = 0;
NavigationPage.SetTitleView(this, CreateTitleView(controls[idx]));
rootNavPage.On <Android>().SetBarHeight(450);
rootNavPage.On <iOS>().SetPrefersLargeTitles(false);
Content = new ScrollView
{
Content =
new StackLayout
{
Children =
{
new Button {
Text = "Go to SearchBarTitlePage",
Command = new Command(() => {
rootNavPage.PushAsync(new SearchBarTitlePage(rootNavPage));
})
},
new Button {
Text = "Change BarTextColor",
Command = new Command(() => {
if (toggleBarTextColor % 2 == 0)
{
rootNavPage.BarTextColor = Colors.Teal;
}
else
{
rootNavPage.BarTextColor = null;
}
toggleBarTextColor++;
})
},
new Button {
Text = "Change BarBackgroundColor",
Command = new Command(() => {
if (toggleBarBackgroundColor % 2 == 0)
{
rootNavPage.BarBackgroundColor = Colors.Navy;
}
else
{
rootNavPage.BarBackgroundColor = null;
}
toggleBarBackgroundColor++;
})
},
new Button {
Text = "Change Both to default",
Command = new Command(() => {
rootNavPage.BarTextColor = null;
rootNavPage.BarBackgroundColor = null;
})
},
new Button {
Text = "Black background, white text",
Command = new Command(() => {
rootNavPage.BarTextColor = Colors.White;
rootNavPage.BarBackgroundColor = Colors.Black;
})
},
new Button {
Text = "Toggle TitleIcon",
Command = new Command(() => {
var titleIcon = NavigationPage.GetTitleIconImageSource(this);
if (titleIcon == null)
{
titleIcon = "coffee.png";
}
else
{
titleIcon = null;
}
NavigationPage.SetTitleIconImageSource(this, titleIcon);
})
},
new Button {
Text = "Toggle TitleView",
Command = new Command(() => {
var titleView = NavigationPage.GetTitleView(this);
if (titleView == null)
{
titleView = CreateTitleView(controls[idx]);
}
else
{
titleView = null;
}
NavigationPage.SetTitleView(this, titleView);
})
},
new Button {
Text = "Next TitleView",
Command = new Command(() => {
idx++;
if (idx >= controls.Count)
{
idx = 0;
}
var titleView = CreateTitleView(controls[idx]);
NavigationPage.SetTitleView(this, titleView);
})
},
new Button {
Text = "Toggle Back Title",
Command = new Command(() => {
var backTitle = NavigationPage.GetBackButtonTitle(rootNavPage);
if (backTitle == null)
{
backTitle = "Go back home";
}
else
{
backTitle = null;
}
NavigationPage.SetBackButtonTitle(rootNavPage, backTitle);
})
},
new Button {
Text = "Toggle Toolbar Item",
Command = new Command(() => {
if (ToolbarItems.Count > 0)
{
ToolbarItems.Clear();
}
else
{
ToolbarItems.Add(new ToolbarItem {
Text = "Save"
});
}
})
},
new Button {
Text = "Toggle Title",
Command = new Command(() => {
if (Title == null)
{
Title = "NavigationBar Gallery - Legacy";
}
else
{
Title = null;
}
})
},
new Button {
Text = "Toggle BarHeight",
Command = new Command(() => {
if (rootNavPage.On <Android>().GetBarHeight() == -1)
{
rootNavPage.On <Android>().SetBarHeight(450);
}
else
{
rootNavPage.ClearValue(BarHeightProperty);
}
})
}
}
}
};
}
public HomePage()
{
InitializeComponent();
_currentViewTitle = NavigationPage.GetTitleView(this);
imageNavigation.Source = ImageSource.FromResource("Pokedex.imagesTab.pokedexIcon.png");
}
