如何在视图中显示Gluon地图？

Question

我正在尝试Gluon地图。我创建以下map.fxml：

<View fx:id="map" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.runtheworld.MapPresenter">
    <center>
        <Pane fx:id="pane" prefHeight="500.0" prefWidth="300.0" />
    </center>
</View>

控制器/主持人尝试显示一个地图：

public class MapPresenter {
    @FXML Pane pane;
    MapView  mapView = new MapView();
    MapPoint mapPoint = new MapPoint(56.946,24.10589);  // Riga, Latvia
    
    public void initialize() {
        StackPane sp = new StackPane();
        sp.getChildren().add(mapView);
        pane.getChildren().add(sp);
        
        // This throws error: "WARNING: sorry, would be too small". Uncommented, it crashes with IndexOutOfBoundsException
        // mapView.setZoom(9);
    }
}

视图，地图如下：

public class MapView {
    public View getView()
    {
        try {
            View view = FXMLLoader.load(MapView.class.getResource("map.fxml"));
            return view;
        } catch (IOException e) {
            System.out.println("IOException: " + e);
            return new View();
        }
    }
}

主类如下：

public class Main extends Application {
    public static final String MAP_VIEW = "map";
    private final AppManager appManager = AppManager.initialize(this::postInit);

    @Override
    public void init() {
        appManager.addViewFactory(MAP_VIEW, () -> new MapView().getView());
    }

    @Override
    public void start(Stage stage) {
        appManager.start(stage);
    }

    private void postInit(Scene scene) {
        appManager.switchView(MAP_VIEW);
    }

    public static void main(String[] args) {
        launch(args);
    }
}

如果我不在控制器/主持人中设置Zoom，否则我将Zoom设置为一个小于6（？）的值，我会收到以下错误：“警告：对不起，太小了”，我只能放大，而不是退出。凝视代码，此错误意味着（负）缩放计算小于layoutbounds（）。getheight（），该区域始终为0.0（MapView扩展了区域）。

如果我将缩放器/主持人的缩放设置为值6至10左右的值，则需要一些时间显示Gluon飞溅或空白屏幕，然后有时只有一分钟或更长时间才能最终用类似的堆栈崩溃：

Exception in thread "JavaFX Application Thread" java.lang.IndexOutOfBoundsException: Index -1 out of bounds for length 83
    at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
    at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
    at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:266)
    at java.base/java.util.Objects.checkIndex(Objects.java:359)
    at java.base/java.util.ArrayList.get(ArrayList.java:427)
    at javafx.graphics/javafx.scene.Parent.updateCachedBounds(Parent.java:1704)
    at javafx.graphics/javafx.scene.Parent.recomputeBounds(Parent.java:1648)
    at javafx.graphics/javafx.scene.Parent.doComputeGeomBounds(Parent.java:1501)
    at javafx.graphics/javafx.scene.Parent$1.doComputeGeomBounds(Parent.java:115)
    at javafx.graphics/com.sun.javafx.scene.ParentHelper.computeGeomBoundsImpl(ParentHelper.java:84)
    at javafx.graphics/com.sun.javafx.scene.NodeHelper.computeGeomBounds(NodeHelper.java:116)
    at javafx.graphics/javafx.scene.Node.updateGeomBounds(Node.java:3813)
    at javafx.graphics/javafx.scene.Node.getGeomBounds(Node.java:3775)
    at javafx.graphics/javafx.scene.Node.getLocalBounds(Node.java:3723)
    at javafx.graphics/javafx.scene.Node.updateTxBounds(Node.java:3877)
    at javafx.graphics/javafx.scene.Node.getTransformedBounds(Node.java:3669)
    at javafx.graphics/javafx.scene.Node.updateBounds(Node.java:771)
    at javafx.graphics/javafx.scene.Parent.updateBounds(Parent.java:1835)
    at javafx.graphics/javafx.scene.Parent.updateBounds(Parent.java:1833)
    at javafx.graphics/javafx.scene.Parent.updateBounds(Parent.java:1833)
    at javafx.graphics/javafx.scene.Parent.updateBounds(Parent.java:1833)
    at javafx.graphics/javafx.scene.Parent.updateBounds(Parent.java:1833)
    at javafx.graphics/javafx.scene.Parent.updateBounds(Parent.java:1833)
    at javafx.graphics/javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2530)
    at javafx.graphics/com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:421)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at javafx.graphics/com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:420)
    at javafx.graphics/com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:450)
    at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:575)
    at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:555)
    at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:548)
    at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:353)
    at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication.enterNestedEventLoopImpl(Native Method)
    at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication._enterNestedEventLoop(GtkApplication.java:360)
    at javafx.graphics/com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:515)
    at javafx.graphics/com.sun.glass.ui.EventLoop.enter(EventLoop.java:107)
    at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:647)
    at javafx.graphics/javafx.application.Platform.enterNestedEventLoop(Platform.java:301)
    at com.gluonhq.charm.glisten.control.Dialog.lambda$installIntoMobileApplication$7(Dialog.java:605)
    at javafx.base/com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChangedEvent(ExpressionHelper.java:181)
    at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
    at javafx.base/javafx.beans.property.BooleanPropertyBase.fireValueChangedEvent(BooleanPropertyBase.java:104)
    at javafx.base/javafx.beans.property.ReadOnlyBooleanWrapper.fireValueChangedEvent(ReadOnlyBooleanWrapper.java:101)
    at javafx.base/javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:111)
    at javafx.base/javafx.beans.property.BooleanPropertyBase$Listener.invalidated(BooleanPropertyBase.java:239)
    at javafx.base/com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:348)
    at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
    at javafx.base/javafx.beans.property.BooleanPropertyBase.fireValueChangedEvent(BooleanPropertyBase.java:104)
    at javafx.base/javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:111)
    at javafx.base/javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:145)
    at javafx.base/javafx.beans.property.BooleanProperty.setValue(BooleanProperty.java:79)
    at com.gluonhq.charm.glisten.layout.Layer.show(Layer.java:289)
    at com.gluonhq.charm.glisten.control.Dialog.showAndWait(Dialog.java:556)
    at com.gluonhq.impl.charm.glisten.util.NagScreenPresenter.lambda$showDialog$1(NagScreenPresenter.java:77)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:457)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:456)
    at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
    at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(GtkApplication.java:290)
    at java.base/java.lang.Thread.run(Thread.java:833)

每当我在屏幕上移动光标，但长度值增加时都会重复。如果我输入12或更高的缩放值，则不会加载屏幕。

如何在视图中正确显示地图？

编辑： 下载Gluon地图代码后，我添加了几条调试线以确定可能发生的事情。在BaseMap中，在Zoom（）方法中存在一个“高度”计算，该计算与父容器高度进行了比较。如果此计算大于父母的高度，则最终会出现奥术和无用的错误：“警告对不起，太小了”。

父高度似乎是一个任意值（我看到1024.0、1098.0、1261.0 ...等），而高度计算通常超过此看似任意的父高度值。

诀窍是设置您的容器大小，例如：

sp.setPrefSize(300.d,500.d);

正常服务将被恢复。