Using the loadContent() Function to Load a Scene Graph in Java

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Using the loadContent() Function to Load a Scene Graph
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package javafximport; import import import import javafxfxdFXDLoader; javafxsceneScene; javafxstageStage; javafxscenepaintColor;
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var url = "{__DIR__}Banner1fxz"; var content = FXDLoaderloadContent(url); var bgShape = contentgetShape("BackgroundNode"); bgShapefill = ColorBLACK; Stage { title: "Banner Example #2" scene: Scene { content: [ contentgetRoot() ] } }
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You ll find this code in the file javafximport/BannerExample2fx, and the result of running it is shown in Figure 21-7
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Figure 21-7
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Extracting part of the content of an FXZ file
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On line 9, we load the file content into an FXDContent object, and then on line 10, we get the shape that represents the background by calling its getShape() function On line 11, we change its fill to black and finally, on line 17, we install the loaded scene graph into the scene
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21 Importing Graphics
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If you call one of the getXXX() functions with an id that does not exist, it returns the value nullThe same happens if you supply an id that corresponds to a node of the wrong type for the function that you are calling For example, the following invocation of the getGroup() would return null because the background node is a shape rather than a group:
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var bgGroup = contentgetGroup("BackgroundNode"); // Returns null
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Another way to locate nodes from an FXDContent object is to use its select() function:
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public function select(query:String):Object
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The query string uses a syntax similar to XQueryTo locate a node, create a path consisting of the ids of its parent nodes and the node itself, separated by forward slash (/) characters If you open the file Banner1fxz in NetBeans and look at the source, you see that it contains an SVGPath node called BackgroundNode that is located within a Group called BackgroundYou can locate this node using the following code (which you can find in the file javafximport/BannerExample2a):
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var url = "{__DIR__}Banner1fxz"; var content = FXDLoaderloadContent(url); var bgShape = contentselect("/Background/BackgroundNode") as Shape;
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You can access properties of a node by adding the property name to the node s path, separated by a periodThe following code uses this technique to get the value of the fill property of the same node:
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var fill = contentselect("/Background/BackgroundNodefill") as Paint;
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Asynchronous Loading of Content Synchronous loading of content is simple to incorporate into your application and convenient for code examples, but in the real world the delay caused by reading and parsing the content of an FXZ file, even if it is on the same machine as your application, may be unacceptable because the user interface may be unresponsive for a noticeable period In real-world applications, it is better to load content asynchronously, so that the application remains responsive to the user at all timesWhile your content is being loaded, you could show an animation, an image, or a text message that indicates that the rest of the user interface will appear shortly Two script functions in the FXDLoader class support asynchronous loading:
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public function loadOnBackground(url:String, loader:FXDLoader):FXDLoader; public function createLoader(url:String):FXDLoader;
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The coding pattern used with these two functions is slightly different, as you ll see in the examples that followThe choice between the two is largely a matter of tasteThe code in Listing 21-3 uses the loadOnBackground() function to asynchronously load and display the content of the Banner1fxz file
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Listing 21-3
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
Asynchronous Loading Using the loadOnBackground() Function
package javafximport; import javafxsceneScene; import javafxstageStage; import import import import import import javafxgeometryHPos; javafxgeometryVPos; javafxscenetextText; javafxscenetextFont; javafxscenelayoutFlow; javafxfxdFXDLoader;
var scene:Scene; var text:Text; Stage { title: "Banner Example #3a" scene: scene = Scene { width: 500 height: 300 content: [ Flow { width: bind scenewidth height: bind sceneheight hpos: HPosCENTER vpos: VPosCENTER content: text = Text { content: "Loading" font: Font { size: 24 } } } ] } } var loader:FXDLoader = FXDLoader { onDone: function() { if (loadersucceeded) { scenecontent = loadercontentgetRoot(); } else { textcontent = "Load failed!"; println(loadercauseOfFailure); } } } FXDLoaderloadOnBackground("{__DIR__}Banner1fxz", loader);