VBox

如果我们在应用程序中使用VBox作为布局，则所有节点都设置在一个垂直列中。

包javafx.scene.layout名为VBox的类表示VBox窗格。 该类包含五个属性，它们是 -alignment - 此属性表示VBox边界内节点的对齐方式。 您可以使用setter方法setAlignment()为此属性设置值。

fillHeight - 此属性是布尔类型，并将此设置为true; VBox中可调整大小的节点的大小调整为VBox的高度。 您可以使用setter方法setFillHeight()为此属性设置值。

spacing - 此属性是double类型，它表示VBox的子节点之间的空间。 您可以使用setter方法setSpacing()为此属性设置值。

除此之外，本课程还提供以下方法 -setVgrow() - 设置VBox包含的子项的垂直增长优先级。 此方法接受节点和优先级值。

setMargin() - 使用此方法，可以将边距设置为VBox。 此方法接受Insets类的节点和对象(矩形区域的4个边的一组内部偏移)

例子 (Example)

以下程序是VBox布局的示例。 在这里，我们插入一个文本字段和两个按钮，播放和停止。 这是以10的间距完成的，每个边距都有尺寸 - (10,10,10,10)。

将此代码保存在名为VBoxExample.java的文件中。import javafx.application.Application;

import javafx.collections.ObservableList;

import javafx.geometry.Insets;

import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.scene.control.TextField;

import javafx.stage.Stage;

import javafx.scene.layout.VBox;

public class VBoxExample extends Application {

@Override

public void start(Stage stage) {

//creating a text field

TextField textField = new TextField();

//Creating the play button

Button playButton = new Button("Play");

//Creating the stop button

Button stopButton = new Button("stop");

//Instantiating the VBox class

VBox vBox = new VBox();

//Setting the space between the nodes of a VBox pane

vBox.setSpacing(10);

//Setting the margin to the nodes

vBox.setMargin(textField, new Insets(20, 20, 20, 20));

vBox.setMargin(playButton, new Insets(20, 20, 20, 20));

vBox.setMargin(stopButton, new Insets(20, 20, 20, 20));

//retrieving the observable list of the VBox

ObservableList list = vBox.getChildren();

//Adding all the nodes to the observable list

list.addAll(textField, playButton, stopButton);

//Creating a scene object

Scene scene = new Scene(vBox);

//Setting title to the Stage

stage.setTitle("Vbox Example");

//Adding scene to the stage

stage.setScene(scene);

//Displaying the contents of the stage

stage.show();

}

public static void main(String args[]){

launch(args);

}

}

使用以下命令从命令提示符编译并执行保存的java文件。javac VBoxExample.java

java VBoxExample.java

执行时，上面的程序生成一个JavaFX窗口，如下所示。

/* $Id: TestVBox.java 101270 2015-06-25 11:31:10Z klaus $ *//* Small sample/testcase which demonstrates that the same source code can* be used to connect to the webservice and (XP)COM APIs. *//** Copyright (C) 2010-2015 Oracle Corporation** This file is part of VirtualBox Open Source Edition (OSE), as* available from http://www.virtualbox.org. This file is free software;* you can redistribute it and/or modify it under the terms of the GNU* General Public License (GPL) as published by the Free Software* Foundation, in version 2 as it comes in the "COPYING" file of the* VirtualBox OSE distribution. VirtualBox OSE is distributed in the* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.*/importorg.virtualbox_5_0.*;importjavax.swing.*;importjava.util.List;importjava.util.Arrays;//import java.math.BigInteger;public classTestVBoxFive

{

private static voidprocessEvent(IEvent ev)

{

System.out.println("got event: "+ ev);VBoxEventType type = ev.getType();System.out.println("type = "+ type);switch(type)

{

caseOnMachineStateChanged:

{

IMachineStateChangedEvent mcse = IMachineStateChangedEvent.queryInterface(ev);if(mcse == null)

System.out.println("Cannot query an interface");elseSystem.out.println("mid="+ mcse.getMachineId());break;}

}

}

static classEventHandler

{

EventHandler() {}

public voidhandleEvent(IEvent ev)

{

try{

processEvent(ev);} catch(Throwable t) {

t.printStackTrace();}

}

}

private static voidtestEvents(VirtualBoxManager mgr,IEventSource es)

{

// active mode for Java doesn't fully work yet, and using passive// is more portable (the only mode for MSCOM and WS) and thus generally// recommendedIEventListener listener = es.createListener();es.registerListener(listener,Arrays.asList(VBoxEventType.Any), false);try{

for(inti = 0;i < 50;i++)

{

System.out.print(".");IEvent ev = es.getEvent(listener,500);if(ev != null)

{

processEvent(ev);es.eventProcessed(listener,ev);}

// process system event queuemgr.waitForEvents(0);}

} catch(Exception e) {

e.printStackTrace();}

es.unregisterListener(listener);}

private static voidtestEnumeration(VirtualBoxManager mgr,IVirtualBox vbox)

{

List machs = vbox.getMachines();for(IMachine m : machs)

{

String name;Long ram = 0L;booleanhwvirtEnabled = false,hwvirtNestedPaging = false;booleanpaeEnabled = false;booleaninaccessible = false;try{

name = m.getName();ram = m.getMemorySize();hwvirtEnabled = m.getHWVirtExProperty(HWVirtExPropertyType.Enabled);hwvirtNestedPaging = m.getHWVirtExProperty(HWVirtExPropertyType.NestedPaging);paeEnabled = m.getCPUProperty(CPUPropertyType.PAE);// String osType = m.getOSTypeId();// IGuestOSType foo = vbox.getGuestOSType(osType);}

catch(VBoxException e)

{

name = "";inaccessible = true;}

System.out.println("VM name: "+ name);if(!inaccessible)

{

System.out.println(" RAM size: "+ ram + "MB"+ ", HWVirt: "+ hwvirtEnabled

+ ", Nested Paging: "+ hwvirtNestedPaging

+ ", PAE: "+ paeEnabled);}

}

// process system event queuemgr.waitForEvents(0);}

private static booleanprogressBar(VirtualBoxManager mgr,IProgress p, longwaitMillis)

{

longend = System.currentTimeMillis() + waitMillis;while(!p.getCompleted())

{

// process system event queuemgr.waitForEvents(0);// wait for completion of the task, but at most 200 msecsp.waitForCompletion(200);if(System.currentTimeMillis() >= end)

return false;}

return true;}

private static voidtestStart(VirtualBoxManager mgr,IVirtualBox vbox)

{

IMachine m = vbox.getMachines().get(0);String name = m.getName();System.out.println("\nAttempting to start VM '"+ name + "'");if(name.contains("Android")){

System.out.println("------------------------------");ISession session = mgr.getSessionObject();IProgress p = m.launchVMProcess(session,"gui","");progressBar(mgr,p,10000);session.unlockMachine();// process system event queuemgr.waitForEvents(0);}

}

private static voidgetDispalyInfo(VirtualBoxManager mgr,IVirtualBox vbox){

System.out.println("\nvbox Dispaly Info:");longscreenId = 0;IMachine m = vbox.getMachines().get(0);ISession session = mgr.getSessionObject();m.lockMachine(session,LockType.VM);IConsole console = session.getConsole();IProgress p = console.powerUpPaused();progressBar(mgr,p,10000);IDisplay display = console.getDisplay();MainView mainView = newMainView();IFramebuffer framebuffer = newIFramebuffer(mainView);// framebuffer.notifyUpdate(100L, 100L, 20L, 20L);display.attachFramebuffer(screenId,framebuffer);IFramebuffer framebufferOut = display.queryFramebuffer(screenId);System.out.println("framebuffer:"+ framebufferOut);bytevboxAddress = 0;display.getTypedWrapped().drawToScreen(screenId,vboxAddress,100L,100L,20L,20L);// Holder w = new Holder<>();// Holder h = new Holder<>();// Holder pix = new Holder<>();// Holder x = new Holder<>();// Holder y = new Holder<>();// Holder status = new Holder<>();// display.getScreenResolution(screenId, w, h, pix, x, y, status); session.unlockMachine(); System.out.print("w:" + w.value + " h:" + h.value + " pix:" + pix.value + " x:" + x.value + " y:" + y.value);// testStart(mgr, vbox);}

static voidtestMultiServer()

{

VirtualBoxManager mgr1 = VirtualBoxManager.createInstance(null);VirtualBoxManager mgr2 = VirtualBoxManager.createInstance(null);try{

mgr1.connect("http://i7:18083","","");mgr2.connect("http://main:18083","","");IMachine m1 = mgr1.getVBox().getMachines().get(0);IMachine m2 = mgr2.getVBox().getMachines().get(0);// String name1 = m1.getName();// String name2 = m2.getName();ISession session1 = mgr1.getSessionObject();ISession session2 = mgr2.getSessionObject();IProgress p1 = m1.launchVMProcess(session1,"gui","");IProgress p2 = m2.launchVMProcess(session2,"gui","");progressBar(mgr1,p1,10000);progressBar(mgr2,p2,10000);session1.unlockMachine();session2.unlockMachine();// process system event queuemgr1.waitForEvents(0);mgr2.waitForEvents(0);} finally{

mgr1.cleanup();mgr2.cleanup();}

}

private static voidtestReadLog(VirtualBoxManager mgr,IVirtualBox vbox)

{

IMachine m = vbox.getMachines().get(0);longlogNo = 0;longoff = 0;longsize = 16* 1024;while(true)

{

byte[] buf = m.readLog(logNo,off,size);if(buf.length== 0)

break;System.out.print(newString(buf));off += buf.length;}

// process system event queuemgr.waitForEvents(0);}

private static voidprintErrorInfo(VBoxException e)

{

System.out.println("VBox error: "+ e.getMessage());System.out.println("Error cause message: "+ e.getCause());System.out.println("Overall result code: "+ Integer.toHexString(e.getResultCode()));inti = 1;for(IVirtualBoxErrorInfo ei = e.getVirtualBoxErrorInfo();ei != null;ei = ei.getNext(),i++)

{

System.out.println("Detail information #"+ i);System.out.println("Error mesage: "+ ei.getText());System.out.println("Result code: "+ Integer.toHexString(ei.getResultCode()));// optional, usually provides little additional information:System.out.println("Component: "+ ei.getComponent());System.out.println("Interface ID: "+ ei.getInterfaceID());}

}

private static voidshowMainView(){

JFrame frame = newJFrame("MainForm");JPanel panel_main = newMainForm().panel_main;frame.setContentPane(panel_main);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.pack();frame.setVisible(true);}

public static voidmain(String[] args)

{

showMainView();// System.out.println("java.library.path: " + System.getProperties().get("java.library.path") + "\n");VirtualBoxManager mgr = VirtualBoxManager.createInstance("/Applications/VirtualBox.app/Contents/MacOS");// VirtualBoxManager mgr = VirtualBoxManager.createInstance(null);booleanws = false;String url = null;String user = null;String passwd = null;for(inti = 0;i < args.length;i++)

{

if(args[i].equals("-w"))

ws = true;else if(args[i].equals("-url"))

url = args[++i];else if(args[i].equals("-user"))

user = args[++i];else if(args[i].equals("-passwd"))

passwd = args[++i];}

if(ws)

{

try{

mgr.connect(url,user,passwd);} catch(VBoxException e) {

e.printStackTrace();System.out.println("Cannot connect, start webserver first!");}

}

try{

IVirtualBox vbox = mgr.getVBox();if(vbox != null)

{

System.out.println("VirtualBox version: "+ vbox.getVersion() + "\n");testEnumeration(mgr,vbox);testReadLog(mgr,vbox);// getDispalyInfo(mgr, vbox);testStart(mgr,vbox);// testEvents(mgr, vbox.getEventSource()); System.out.println("done, press Enter...");// int ch = System.in.read();}

}

catch(VBoxException e)

{

printErrorInfo(e);System.out.println("Java stack trace:");e.printStackTrace();}

catch(RuntimeException e)

{

System.out.println("Runtime error: "+ e.getMessage());e.printStackTrace();}

// catch (java.io.IOException e)// {// e.printStackTrace();// }// process system event queuemgr.waitForEvents(0);if(ws)

{

try{

mgr.disconnect();} catch(VBoxException e) {

e.printStackTrace();}

}

mgr.cleanup();}

}

一:相关类和方法

1:   javafx.scene.layout.Priority，一个枚举类,用于确定给定节点的增长(或缩小)优先级。比如:一个HBox布局，里面有三个控件，当屏幕宽度是800时，刚好把屏幕占满，但是当屏幕扩大到1200时，这个Priority规定了这三个控件如何处理增加的400宽度。共有三个取值：

ALWAYS：布局区域将始终尝试增长(或缩小)，共享那些空间;

SOMETIMES:如果没有控件设置为ALWAYS，或者其它控件没有处理完变化的控件，设置为SOMETIMES的控件将和其它控件分享这些区域。

NEVER:控件不会参与处理变化的空间。

2.  HBox.setHgrow(Node child, Priority value),HBox.getHgrow(Node child);

VBox.setVgrow(Node child, Priority value),VBox.getVgrow(Node child);

3.  注意事项

如果HBox里面所有的控件都设置成ALWAYS，那么这些控件需要设置maxWidth="Infinity"，否则会不起作用。

二:实例

1. main.xml

2.  Main.java

import javafx.application.Application;

import javafx.fxml.FXMLLoader;

import javafx.scene.Parent;

import javafx.scene.Scene;

import javafx.stage.Stage;

public class Main extends Application {

@Override

public void start(Stage primaryStage) throws Exception{

Parent root = FXMLLoader.load(getClass().getResource("main.fxml"));

primaryStage.setTitle("HBox Button 自动增长");

primaryStage.setScene(new Scene(root));

primaryStage.show();

}

public static void main(String[] args) {

launch(args);

}

}

3. main.css

/**设置背景颜色**/

.root{

-fx-background-color:#ffffff;

}

/**设置Label样式**/

.label {

-fx-font-size: 16px;

-fx-font-weight: bold;

-fx-text-fill: #333333;

-fx-effect: dropshadow( gaussian , rgba(255,255,255,0.5) , 0,0,0,1 );

}

/**设置Button样式**/

.button{

/*设置背景颜色渐变*/

-fx-background-color: linear-gradient(to right,#ABB2B9,#ABB2B9);

-fx-text-fill:#ffffff;

-fx-font-size: 16px;

/*设置圆角*/

-fx-background-radius: 10;

-fx-border-radius: 10;

}

/**设置Button  鼠标悬停样式**/

.button:hover{

-fx-border-color: blue;

}

/**设置Button 点击鼠标样式**/

.button:pressed{

/**设置边框背景颜色**/

-fx-border-color: red;

}

/**设置HBox背景样式 bg是自定义的class**/

.bg{

/*设置圆角*/

-fx-background-radius: 10;

-fx-border-radius: 10;

-fx-background-color:#EAECEE;

}

4. 效果图

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版权声明：本文为CSDN博主「cdcdec」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。

原文链接：https://blog.csdn.net/cdc_csdn/article/details/80710001