I'm working with Android TV for the first time and I'm learning to use Leanback by modifying the example tv app that is provided.
The issue I'm having is that when I press left on the first item in the lists the navigation drawer opens and focus goes to the headers in the navigation drawer. When this happens, the info_field view in the ImageCardViews collapse behind the image.
What happens: The info field on the ImageCardView hides when I open the navigation drawer.
What I want to Happen: The info field remains visible when I open the navigation drawer.
I'm sure there's a way to do this because I've seen it in some Android TV apps, like Twitch. What's the best way to have the info_field visible when the navigation drawer is open?
I've worked out how to do it. In the CardPresenter, in onCreateViewHolder, when creating the ImageCardView I've overridden the BaseCardView method, setActivated(boolean activated) to always pass 'true' into it's super. And then call setActivated so that it's activated from the beginning. Like this:
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent) {
ImageCardView cardView = new ImageCardView(parent.getContext()) {
#Override
public void setActivated(boolean activated) {
super.setActivated(true);
}
#Override
public void setSelected(boolean selected) {
updateCardBackgroundColor(this, selected);
super.setSelected(selected);
}
};
cardView.setActivated(true);
cardView.setFocusable(true);
cardView.setFocusableInTouchMode(true);
return new ViewHolder(cardView)
}
So that did the trick for me. The ImageCardView never collapses.
I think if you look at this SO post you'll get most of the way there. The info view hides due to what leanback calls "expanding".
Try just calling enableMainFragmentScaling(false); in your BrowseFragment and see if that does what you want. If it doesn't feel like exactly what you want, refer to the post I linked to.
Additionally, if you've tried what I recommend in the linked SO post, you could also call the API on the BaseCardView setInfoVisibility() and pass it CARD_REGION_VISIBLE_ALWAYS. This just requires calling on a reference to your card which shouldn't need an override of the Presenter or Card.
Related
I am building an app that makes use of some App links. In below example, I want to open a ResetPasswordPage when the user activates a link from an e-mail.
protected override async void OnInitialized()
{
InitializeComponent();
await NavigationService.NavigateAsync("/NavigationPage/LoginPage");
}
protected override void OnAppLinkRequestReceived(Uri uri)
{
if (uri.Host.EndsWith("site.nl", StringComparison.OrdinalIgnoreCase))
{
if (uri.AbsolutePath.StartsWith(#"/appname/resetpassword/"))
{
if (uri.Segments.Length == 4)
{
string resetCode = uri.Segments[3];
NavigationParameters param = new();
param.Add(NavConst.PasswordResetCode, resetCode);
await NavigationService.NavigateAsync("ResetPasswordPage", param);
}
}
}
}
This code works, but not what I would expect (for both iOS and Android). I would expect that ResetPasswordPage would be added to the navigation stack that was set in OnInitialized, so that it would contain a back button in the navigation bar, bringing the user back to the login page in this case.
But instead, it looks like the navigation stack gets replaced. When ResetPasswordPage is shown, and the user clicks the hardware back button, the app is closed. However, i want it to go back to where the user was before.
Am I not understanding some navigation concepts well or might this be a bug?
The NavigationService is a rather unique service within Prism for Xamarin.Forms. It is constructed new for each page as navigation and the navigation stack is dependent on where you are navigating from.
For instance when you Navigate from the context of a MasterDetailPage / FlyoutPage, it understands that you aren't trying to push a modal on top of that page but instead you are starting from the context of Detail/Flyout. If the NavigationService continually updated the Page context then the navigation service injected into that MasterDetailPage/FlyoutPage's ViewModel would have no idea that it needed that page as the context to navigate from.
Your issue here ultimately is that you are Navigating from the context of the Application which has a NavigationService with no Page set. As a result even a relative Navigation will still have the effect of an absolute Navigation thus resetting the Application.MainPage since that NavigationService does not have the contextual understanding of another page.
Depending on your business requirements you have a few different options. One is to do an absolute Navigation that gives you navigation stack that you're looking for.
Optionally you may want to get the currently displayed page and update the NavigationService to understand it. In the App class you might add something like:
protected override void OnAppLinkRequestReceived(Uri uri)
{
if (NavigationService is IPageAware pa)
{
page.Page = PageUtilities.GetCurrentPage(MainPage);
}
if (someCondition)
{
// This will now navigate from relatively from the page
// returned by GetCurrentPage.
NavigationService.NavigateAsync("SomeRelativeUrl")
.OnNavigationError(HandleNavigationError);
}
}
I have made a conversation stage in JavaFx with a WebView that is displaying whole conversation. I want to show it from the bottom where the newest messages are so I used a function "execute script":
public void initialize() throws SQLException
{
buildText();
conversationText.getEngine().loadContent(text1);
conversationText.getEngine().executeScript("window.scrollTo(0, document.body.scrollHeight);");
conversationText.getEngine().setUserStyleSheetLocation(getClass().getResource("/html/style.css").toExternalForm());
}
I wrote this function in an initialize() void but it doesn't work, when I open the conversation it shows me all from the top where the eldest messages are :
But what is interesting it works properly when I use this metod form a void that is connected with a button named "script"
public void script()
{
conversationText.getEngine().executeScript("window.scrollTo(0, document.body.scrollHeight);");
}
when I press this button it scrolls to the bottom :
Is there any way to do this correct in an initialize void ? I have tried many ways like inserting the button method script() into initialize but i noticed that if I use function webengine.loadcontent() it always displays me all from the top.
I want to show the user the newest messages at the bottom from the beginning , not after pushing a button.
I am trying to implement a login scenario with Xamarin Forms and Prism.
My application root page is a MasterDetail page (HomeMasterDetailPage); this being used to provide the side menu.
What I am trying to do is to have the HomeMasterDetailPage page shown with Content set to an instance of LoginPage. When the user logs in, the Content should change to an instance of HomeDetailContentPage. It should not be possible to return to the LoginPage using the back button.
I am using the NavigationService from Prism Forms.
My start up is like this...
public partial class App : PrismApplication {
public App(IPlatformInitializer initializer = null)
: base(initializer) {
}
protected override void OnInitialized() {
InitializeComponent();
Uri uri = new Uri($"/{nameof(NavigationPage)}/{nameof(HomeMasterDetailPage)}/{nameof(HomeDetailContentPage)}", UriKind.Absolute);
var settings = Container.Resolve<SettingsService>();
if (!settings.DeviceUserID.HasValue)
uri = new Uri($"/{nameof(NavigationPage)}/{nameof(HomeMasterDetailPage)}/{nameof(LoginPage)}", UriKind.Absolute);
NavigationService.NavigateAsync(uri);
}
protected override void RegisterTypes() {
Container.RegisterTypeForNavigation<NavigationPage>();
Container.RegisterTypeForNavigation<LoginPage, LoginPageViewModel>();
Container.RegisterTypeForNavigation<HomeMasterDetailPage, HomePageViewModel>();
Container.RegisterTypeForNavigation<HomeMasterContentPage>();
Container.RegisterTypeForNavigation<HomeDetailContentPage>();
}
}
This correctly displays the LoginPage within the HomeMasterDetailPage if the user is not already logged on, and the HomeDetailContentPage within the same HomeMasterDetailPage if the user is logged on.
The problem comes when actually logging on; the following is the code within the view model for the LoginPage...
protected async Task ExecuteLoginCommand() {
Uri uri = new Uri($"/{nameof(NavigationPage)}/{nameof(HomeMasterDetailPage)}/{nameof(HomeDetailContentPage)}", UriKind.Absolute);
await this.navigationService.NavigateAsync(uri);
}
It is my understanding that by using an absolute Uri this should reset the navigation so that the new page arrangement (/NavigationPage/HomeMasterDetailPage/HomeDetailContentPage) is at the top and bottom of the stack, allowing me to then move forward from there. Instead, I am getting an unhandled exception (on Android 7.0).
What am I doing wrong?
Note: All of the examples that I see have the MasterDetailPage at the root with Content being set to NavigationPage/ContentPage; when I try this I do not get exceptions, however the side menu operates differently within the MasterDetailPage - when you tap on the "hamburger" the side menu slides in over everything (including the action/title bar) and the only way to clear it is to tap outside of the side menu that slides in whereas when I show the MasterDetailPage within a NavigationPage the side menu slides in below the action/title bar and the hamburger changes to an arrow that you can click to hide the side menu again.
I can't say I've tested this exact scenario. However, if your LoginPage is the Detail of a MasterDetailPage, you may not want to perform the navigation from the LoginPage. You could, instead create a SuccessfulLoginEvent, which you would then publish from the LoginPage using the IEventAggregator, and you would subscribe to on your MasterDetailPage's ViewModel. You could then perform the navigation as _navigationService.NavigateAsync("NavigationPage/ViewA") and it should reset the Detail such that the back button doesn't bring you to the LoginPage.
Alternatively, you can simply perform an absolute Navigation which has the effect of:
Application.Current.MainPage = new MyPage().
To do to this, you could do the navigation from anywhere as:
_navigationService.NavigateAsync("/MyMasterDetailPage/NavigationPage/ViewA")
I have a window editor that holds nodes. I would like to open a custom inspector when one of these nodes is selected. The node class is a custom serializable class. Is this possible?.
It seems that custom inspectors can be created manually through the Editor.CreateEditor method but can't see how to let it appear docked like an usual inspector in the unity inspector window.
I would like to achieve the same behaviour that we have when we select a gameobject in sceneview that inmediately show properties for the object (Components, etc...) in the unity inspector.
Cheers
As I'm not sure what you're asking, here are multiple different solutions;
Selection
If you just want your nodes to become the focus of the hierarchy, then in your custom window's OnGUI method, use the code below;
[CustomEditor(typeof(NodeManager))]
public class NodeManager : EditorWindow
{
private static NodeManager window;
private Node[] m_nodes;
[MenuItem("Custom Windows/Node Inspector")]
public static void Init()
{
if(window == null)
window = GetWindow<NodeManager>("Node Manager", true, typeof(SceneView));
}
public void OnGUI()
{
m_nodes = GameObject.FindObjectsOfType<Node>();
foreach(Node node in m_nodes)
{
GUILayout.BeginHorizontal();
{
GUILayout.Label(node.name);
if (GUILayout.Button("Select"))
Selection.objects = new Object[] { node.gameObject };
}
GUILayout.EndHorizontal();
}
}
}
This adds a Button for each object in your custom window view, that will then select that object in the hierarchy.
Auto-Docking
I originally found the second response to this question, which goes into the details of parameters of the GetWindow method, and with this you can clearly see how to dock the window (I've converted it from JS to C# below).
(I looked fairly extensively in UnityEditor and UnityEditorInternal namespaces but couldn't find the Hierarchy or the Inspector).
GetWindow<T>(string title, bool focus, params System.Type[] desiredDockNextTo)
Which we can write for this example as;
EditorWindow.GetWindow<NodeInspector>("Node Test", true, typeof(SceneView));
This example docks the windows next to the SceneView window. This functionality can be combined with a custom inspector's OnInspectorGUI method, to automatically launch the custom node window, if it's not already open.
[CustomEditor(typeof(Node))]
public class NodeInspector : Editor
{
public override void OnInspectorGUI()
{
base.OnInspectorGUI();
NodeManager.Init();
}
}
Sorry if this isn't what you are looking for, if it's not then please give more details and I will amend my answer to better suit the question.
Hope this helped.
Has a possibility, you can make a custom ScriptableObject and Custom Editor for It, and when open the node inspector, just find a instance of the scriptable object and use Selection.selectedObject = scriptableObject, and in the custom editor, make a static field called 'editor' to draw inside.
It will work.
I have two layouts in JavaFX app. The first one contains table view whereas the second one is a simple dialog to input data. The problem is that I want to refresh data after closing the dialog. Now I have a button on the first layout which refreshes data:
data.removeAll(data);
loadDataToTable();
But I don't want to invoke methods shown above with the button but automatically right after closing the dialog. I don't know how to make this, let's say, connection between those controllers.
thanks in advance
The new Dialog, if I am not wrong must be a new Stage ! Let us consider the new Stage to be modifyStage. We can call the onSetCloseRequest of the new Stage and put your code in it.
modifyStage.setOnCloseRequest(new EventHandler<WindowEvent>() {
#Override
public void handle(WindowEvent paramT) {
data.removeAll(data);
loadDataToTable();
}
});