JavaFX：如何保持VBox背景顏色持久？

我以前問過這個問題，但我無法提供一個最好的，最完整的和可驗證的例子。所以我做了另一個正確工作並且完全最小化的樣本。順便說一句，我想改變一個菜單框的顏色，點擊其中的一個，並且當我點擊另一個項目（如按鈕）時，它將保持持久性。下面是低於樣本，請me..again幫助..JavaFX：如何保持VBox背景顏色持久？

FXMLDocumentController.java

package javafxapplication1; 

import java.net.URL; 
import java.util.ResourceBundle; 
import javafx.beans.binding.Bindings; 
import javafx.fxml.FXML; 
import javafx.fxml.Initializable; 
import javafx.geometry.Insets; 
import javafx.scene.Node; 
import javafx.scene.input.MouseEvent; 
import javafx.scene.layout.Background; 
import javafx.scene.layout.BackgroundFill; 
import javafx.scene.layout.CornerRadii; 
import javafx.scene.layout.VBox; 
import javafx.scene.paint.Color; 

/** 
* 
* @author James 
*/ 
public class FXMLDocumentController implements Initializable { 
    @FXML 
    private VBox menuVBox1 = new VBox(); 
    @FXML 
    private VBox menuVBox2 = new VBox(); 
    @FXML 
    private VBox menuVBox3 = new VBox(); 
    @FXML 
    private VBox parentMenuVBox = new VBox(menuVBox1, menuVBox2, menuVBox3); 

    private final Background focusBackground = new Background(new BackgroundFill(Color.web("#000000"), CornerRadii.EMPTY, Insets.EMPTY)); 
    private final Background unfocusBackground = new Background(new BackgroundFill(Color.web("#F4F4F4"), CornerRadii.EMPTY, Insets.EMPTY)); 

    private void setMenuBoxColor (VBox menu) { 
     VBox menuVBox = menu; 
     menuVBox.requestFocus(); 
     for (Node child : parentMenuVBox.getChildren()) { 
      VBox vb = (VBox) child; 
      vb.backgroundProperty().bind(Bindings 
        .when(vb.focusedProperty()) 
        .then(focusBackground) 
        .otherwise(unfocusBackground) 
      ); 
     } 
    } 

    @FXML 
    private void handleSelectMenus(MouseEvent event) { 
     //Change the color of clicked VBox 
     setMenuBoxColor((VBox)event.getSource()); 

     System.out.println("Menu clicked"); 
    } 

    @Override 
    public void initialize(URL url, ResourceBundle rb) { 
     // TODO 
    }  

}

FXMLDocument.fxml

<?xml version="1.0" encoding="UTF-8"?> 

<?import javafx.geometry.*?> 
<?import java.lang.*?> 
<?import java.util.*?> 
<?import javafx.scene.*?> 
<?import javafx.scene.control.*?> 
<?import javafx.scene.layout.*?> 


<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="132.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="javafxapplication1.FXMLDocumentController"> 
    <left> 
     <VBox fx:id="parentMenuVBox" prefHeight="200.0" prefWidth="100.0" spacing="10.0" BorderPane.alignment="CENTER"> 
     <children> 
      <VBox fx:id="menuVBox1" onMouseClicked="#handleSelectMenus" prefHeight="200.0" prefWidth="100.0" style="-fx-border-color: #000000;"> 
       <children> 
        <Label text="MENU1" /> 
       </children> 
      </VBox> 
      <VBox fx:id="menuVBox2" layoutX="10.0" layoutY="10.0" onMouseClicked="#handleSelectMenus" prefHeight="200.0" prefWidth="100.0" style="-fx-border-color: #000000;"> 
       <children> 
        <Label text="MENU2" /> 
       </children> 
      </VBox> 
      <VBox fx:id="menuVBox3" layoutX="10.0" layoutY="160.0" onMouseClicked="#handleSelectMenus" prefHeight="200.0" prefWidth="100.0" style="-fx-border-color: #000000;"> 
       <children> 
        <Label text="MENU3" /> 
       </children> 
      </VBox> 
     </children> 
     <padding> 
      <Insets bottom="10.0" left="10.0" right="10.0" top="10.0" /> 
     </padding> 
     </VBox> 
    </left> 
    <bottom> 
     <HBox prefHeight="100.0" prefWidth="200.0" BorderPane.alignment="CENTER"> 
     <children> 
      <Button mnemonicParsing="false" text="Next" /> 
     </children> 
     </HBox> 
    </bottom> 
</BorderPane>

javaFXApplication1.java

package javafxapplication1; 

import javafx.application.Application; 
import javafx.fxml.FXMLLoader; 
import javafx.scene.Parent; 
import javafx.scene.Scene; 
import javafx.stage.Stage; 

/** 
* 
* @author James 
*/ 
public class JavaFXApplication1 extends Application { 

    @Override 
    public void start(Stage stage) throws Exception { 
     Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml")); 

     Scene scene = new Scene(root); 

     stage.setScene(scene); 
     stage.show(); 
    } 

    /** 
    * @param args the command line arguments 
    */ 
    public static void main(String[] args) { 
     launch(args); 
    } 

}

來源

2015-11-28 James

首先設置unfocusBackground爲所有子vboxes，然後設置爲focusBackground只選一個。

public class FXMLDocumentController implements Initializable 
{ 
    @FXML 
    private VBox parentMenuVBox; 

    private final Background focusBackground = new Background(new BackgroundFill(Color.web("#000000"), CornerRadii.EMPTY, Insets.EMPTY)); 
    private final Background unfocusBackground = new Background(new BackgroundFill(Color.web("#F4F4F4"), CornerRadii.EMPTY, Insets.EMPTY)); 

    @FXML 
    private void handleSelectMenus(MouseEvent event) 
    { 
     // Set unfocusBackground for all child vboxes 
     for (Node child : parentMenuVBox.getChildren()) 
     { 
      VBox vb = (VBox) child; 
      vb.setBackground(unfocusBackground); 
     } 

     // and set focusBackground for only selected one 
     VBox selected = (VBox) event.getSource(); 
     selected.setBackground(focusBackground); 

     System.out.println("Menu clicked"); 
    } 

    @Override 
    public void initialize(URL url, ResourceBundle rb) 
    { 
    } 

}

我只改變了問題代碼中的fxml控制器。

來源

2015-11-28 05:49:52

JavaFX：如何保持VBox背景顏色持久？

回答

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