visibility

问题 I wanted to know how to have a Aframe Component for any entity that define if the entity is seen by the camera, like a bool attribute. "isSeen"= true || false I tried with trigonometry (knowing the rotation of the camera, and the Entities' positions), but I failed. 回答1: How about frustums: checking out if a point(x, y ,z) is within the camera's field of view . The code is quite simple. To use it within a-frame, You could create a component, which will check if the point is seen on each render

问题 I have a generic class X<T> ; This class has a covariant part that I want to be able to access covariantly. So I factor it out into an interface IX<out T> . However, I want this interface to be visible only to the class itself, because it contains also methods that are ment to be private . I.e., inside the class itself, I can upcast to IX<T> and use it covariantly. E.g.: class X<T> : IX<T> { private interface IX<out T>{ // the private covariant interface void foo(); } // It grants access to

问题 I have a generic class X<T> ; This class has a covariant part that I want to be able to access covariantly. So I factor it out into an interface IX<out T> . However, I want this interface to be visible only to the class itself, because it contains also methods that are ment to be private . I.e., inside the class itself, I can upcast to IX<T> and use it covariantly. E.g.: class X<T> : IX<T> { private interface IX<out T>{ // the private covariant interface void foo(); } // It grants access to

问题 I'm a little bit stuck with this one - first and foremost, the following link has been useful however I've come up with a bit of an issue with visibility: The link: Check view visibility I have a scroll view (parent) and a number of sub-views ( LinearLayout -> TableLayout ) etc. There are a number of items I set to View.GONE within the XML ( android:visibility="gone" ). I have some simple code to determine whether it is visible or not using getVisibility() however when I set the item to View

问题 I have a DataGridView which was the subject of a previous question (link). But sometimes the Button is null . This is fine. But if it is null, is there any way I can optionally remove/add (show/hide?) buttons to the DataGridViewButtonColumn of Buttons like this: +------------+------------+ | MyText | MyButton | +------------+------------+ | "do this" | (Yes) | | "do that" | (Yes) | | FYI 'blah' | | <---- this is where I optionally want no button | "do other" | (Yes) | +------------+----------

问题 How to call visibility when the page stops loading? I want to make the progressbar invisible, but the code I am using is not letting me override it: public void onPageFinished(WebView view, String url) { findViewById(R.id.progressBar1).setVisibility(View.GONE); } Activity: public class Browser extends Activity { private WebView webView; private EditText urlEditText; private ProgressBar progress; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);

问题 Recently I have posted a question related to flowlistview item visibility, this question is also related to that. I have 8 images in a list, initially show a question mark image. When tap on the question mark image, the real image will visible under the question mark image. Implemented this feature using the recent thread. This is a game for kids. Game rule: The player first taps one image, then the real image is visible to the player. Then the player taps another image, then that real image

问题 By displaying all the cards, by clicking on the card clicked card and previous cards should be visible and other should be invisible.how could i do it? app.component.html <div class="row "> <div class=" col-md-3" *ngFor="let x of list; let i = index " style="padding:15px;" [hidden]="x.hidden"> <div class="card "> <div class="card-body "> <img src="{{x.productImage}}" class=" rounded" (click)="display(x)" > <div>{{x.product_name}} {{i}}</div> </div> </div> </div> </div> app.component.ts list

问题 I'm stumbling on this data converter stuff, especially with relation to multiple rows and dynamically show/hide an image. Lets take a master/detail data perspective. On a given view (presentation), I have header information and a data grid showing a bunch of line items. Before saving the line items, there could be one or more rows having missing/invalid data. I want to display a graphic image to the left of the line item giving the user some visual cue that ...hey, this row needs to be fixed.

问题 I have two packages - x and y. x contains the Student class and the Grade enum. y contains the Klass class. Why is the type Student.Grade.C not recognized in the Klass class in package y? Do I need to define it in its own file and make it public? package x; enum Grade { A, B, C, D, F, INCOMPLETE }; public class Student { // blah, blah, member variables, getters, setters, constructors } package y; public class Klass { // This enum type is not recognized in this package public static final