void UpdateActionBarTitle()
{
Page view = null;
if (CurrentNavigationPage != null)
{
view = CurrentNavigationPage.CurrentPage;
}
else if (CurrentTabbedPage != null)
{
view = CurrentTabbedPage.CurrentPage;
}
if (view == null)
{
return;
}
ActionBar actionBar = ((Activity)_context).ActionBar;
var useLogo = false;
var showHome = false;
var showTitle = false;
if (ShouldShowActionBarTitleArea())
{
actionBar.Title = view.Title;
FileImageSource titleIcon = NavigationPage.GetTitleIcon(view);
if (!string.IsNullOrWhiteSpace(titleIcon))
{
actionBar.SetLogo(_context.Resources.GetDrawable(titleIcon));
useLogo = true;
showHome = true;
showTitle = true;
}
else
{
showHome = true;
showTitle = true;
}
}
ActionBarDisplayOptions options = 0;
if (useLogo)
{
options = options | ActionBarDisplayOptions.UseLogo;
}
if (showHome)
{
options = options | ActionBarDisplayOptions.ShowHome;
}
if (showTitle)
{
options = options | ActionBarDisplayOptions.ShowTitle;
}
actionBar.SetDisplayOptions(options, ActionBarDisplayOptions.UseLogo | ActionBarDisplayOptions.ShowTitle | ActionBarDisplayOptions.ShowHome);
UpdateActionBarHomeAsUp(actionBar);
}
ParentingViewController CreateViewControllerForPage(Page page)
{
if (Platform.GetRenderer(page) == null)
{
Platform.SetRenderer(page, Platform.CreateRenderer(page));
}
// must pack into container so padding can work
// otherwise the view controller is forced to 0,0
var pack = new ParentingViewController(this)
{
Child = page
};
if (!string.IsNullOrWhiteSpace(page.Title))
{
pack.NavigationItem.Title = page.Title;
}
// First page and we have a master detail to contend with
UpdateLeftBarButtonItem(pack);
//var pack = Platform.GetRenderer (view).ViewController;
var titleIcon = NavigationPage.GetTitleIcon(page);
if (!string.IsNullOrEmpty(titleIcon))
{
try
{
//UIImage ctor throws on file not found if MonoTouch.ObjCRuntime.Class.ThrowOnInitFailure is true;
pack.NavigationItem.TitleView = new UIImageView(new UIImage(titleIcon));
}
catch
{
}
}
var titleText = NavigationPage.GetBackButtonTitle(page);
if (titleText != null)
{
// adding a custom event handler to UIBarButtonItem for navigating back seems to be ignored.
pack.NavigationItem.BackBarButtonItem = new UIBarButtonItem {
Title = titleText, Style = UIBarButtonItemStyle.Plain
};
}
var pageRenderer = Platform.GetRenderer(page);
pack.View.AddSubview(pageRenderer.ViewController.View);
pack.AddChildViewController(pageRenderer.ViewController);
pageRenderer.ViewController.DidMoveToParentViewController(pack);
return(pack);
}
static void toggleTitleIcon(Page page)
{
var titleIcon = NavigationPage.GetTitleIcon(page);
if (titleIcon == null)
{
NavigationPage.SetTitleIcon(page, "coffee.png");
}
else
{
NavigationPage.SetTitleIcon(page, null);
}
}
void titleIcon_Clicked(object sender, EventArgs e)
{
var titleIcon = NavigationPage.GetTitleIcon(this);
if (titleIcon == null)
{
NavigationPage.SetTitleIcon(this, "coffee.png");
}
else
{
NavigationPage.SetTitleIcon(this, null);
}
}
public NavigationBarGallery(NavigationPage rootNavPage)
{
_rootNavPage = rootNavPage;
int toggleBarTextColor = 0;
int toggleBarBackgroundColor = 0;
ToolbarItems.Add(new ToolbarItem {
Text = "Save"
});
NavigationPage.SetTitleIcon(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 = Color.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 = Color.Teal;
}
else
{
rootNavPage.BarTextColor = Color.Default;
}
toggleBarTextColor++;
})
},
new Button {
Text = "Change BarBackgroundColor",
Command = new Command(() => {
if (toggleBarBackgroundColor % 2 == 0)
{
rootNavPage.BarBackgroundColor = Color.Navy;
}
else
{
rootNavPage.BarBackgroundColor = Color.Default;
}
toggleBarBackgroundColor++;
})
},
new Button {
Text = "Change Both to default",
Command = new Command(() => {
rootNavPage.BarTextColor = Color.Default;
rootNavPage.BarBackgroundColor = Color.Default;
})
},
new Button {
Text = "Make sure Tint still works",
Command = new Command(() => {
#pragma warning disable 618
rootNavPage.Tint = Color.Red;
#pragma warning restore 618
})
},
new Button {
Text = "Black background, white text",
Command = new Command(() => {
rootNavPage.BarTextColor = Color.White;
rootNavPage.BarBackgroundColor = Color.Black;
})
},
new Button {
Text = "Toggle TitleIcon",
Command = new Command(() => {
var titleIcon = NavigationPage.GetTitleIcon(this);
if (titleIcon == null)
{
titleIcon = "coffee.png";
}
else
{
titleIcon = null;
}
NavigationPage.SetTitleIcon(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);
}
})
}
}
}
};
}
