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彈簧布局管理器怎么在Java項(xiàng)目中使用-創(chuàng)新互聯(lián)

本篇文章為大家展示了彈簧布局管理器怎么在Java項(xiàng)目中使用,內(nèi)容簡(jiǎn)明扼要并且容易理解,絕對(duì)能使你眼前一亮,通過(guò)這篇文章的詳細(xì)介紹希望你能有所收獲。

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        由 SpringLayout 類(lèi)實(shí)現(xiàn)的布局管理器稱(chēng)為彈簧布局管理器。利用該布局管理器管理組件,當(dāng)改變窗體的大小時(shí),能夠在不改變組件間相對(duì)位置的前提下自動(dòng)調(diào)整組件大小,使組件依舊布滿整個(gè)窗體,從而保證了窗體的整體效果。下面,通過(guò)一個(gè)實(shí)例來(lái)看看彈簧布局管理器的使用方法和效果。

        彈簧布局管理器以容器和組件的邊緣為操作對(duì)象,通過(guò)為組件和容器邊緣以及組件和組件邊緣建立約束,實(shí)現(xiàn)對(duì)組件布局的管理。通過(guò)方法 putConstraint(String e1,Conponet c1,int pad,String e2,Componet c2)可以為各邊之間建立約束,該方法的入口參數(shù)說(shuō)明如下:

c1:需要參考的組件對(duì)象;

c2:需要參考的組件對(duì)象的具體需要參考的邊;

e1:被參考的組件對(duì)象;

e2:被參考的組件對(duì)象的具體被參考的邊;

 pad:兩條邊之間的距離,即兩個(gè)組件之間的間距。

        有點(diǎn)繞,其實(shí)很好理解。

        實(shí)例1:使用彈簧布局管理器。

        本實(shí)例利用彈簧布局管理器實(shí)現(xiàn)窗體,在調(diào)整窗體的大小后,組件仍會(huì)布滿整個(gè)窗體,并且組件間的相對(duì)位置并不會(huì)改變。源碼:

import java.awt.Container;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.Spring;
import javax.swing.SpringLayout;


public class SpringLayout_3 extends JFrame {

	private static final long serialVersionUID = -6045918631932051025L;

	public SpringLayout_3() {
		// TODO Auto-generated constructor stub
		Container container = getContentPane();
		SpringLayout springLayout = new SpringLayout();
		container.setLayout(springLayout);
		JLabel topicLabel = new JLabel("主題 :");
		JLabel contentLabel = new JLabel("內(nèi)容 :");
		final JTextField textField = new JTextField(30);
		JTextArea textArea = new JTextArea(3, 30);
		JScrollPane scrollPane = new JScrollPane();
		scrollPane.setViewportView(textArea);
		textArea.setLineWrap(true);
		final JButton confirmButton = new JButton("取消");
		JButton cancelButton = new JButton("確認(rèn)");
		Spring st = Spring.constant(10);
		Spring st2 = Spring.constant(30);
		container.add(topicLabel);
		springLayout.putConstraint(SpringLayout.NORTH, topicLabel, st, 
				SpringLayout.NORTH, container);
		springLayout.putConstraint(SpringLayout.WEST, topicLabel, st, 
				SpringLayout.WEST, container);
		container.add(textField);
		springLayout.putConstraint(SpringLayout.WEST, textField, st2, 
				SpringLayout.EAST, topicLabel);
		springLayout.putConstraint(SpringLayout.NORTH, textField, 0, 
				SpringLayout.NORTH, topicLabel);
		springLayout.putConstraint(SpringLayout.EAST, textField, Spring.minus(st), 
				SpringLayout.EAST, container);
		container.add(contentLabel);
		springLayout.putConstraint(SpringLayout.WEST, contentLabel, 0, 
				SpringLayout.WEST, topicLabel);
		springLayout.putConstraint(SpringLayout.NORTH, contentLabel, st, 
				SpringLayout.SOUTH, topicLabel);
		container.add(scrollPane);
		springLayout.putConstraint(SpringLayout.NORTH, scrollPane, 0, 
				SpringLayout.NORTH, contentLabel);
		springLayout.putConstraint(SpringLayout.WEST, scrollPane, 0, 
				SpringLayout.WEST, textField);
		springLayout.putConstraint(SpringLayout.EAST, scrollPane, Spring.minus(st), 
				SpringLayout.EAST, container);
		container.add(confirmButton);
		springLayout.putConstraint(SpringLayout.SOUTH, scrollPane, Spring.minus(st), 
				SpringLayout.NORTH, confirmButton);
		springLayout.putConstraint(SpringLayout.EAST, confirmButton, Spring.minus(st), 
				SpringLayout.EAST, container);
		springLayout.putConstraint(SpringLayout.SOUTH, confirmButton, Spring.minus(st), 
				SpringLayout.SOUTH, container);
		container.add(cancelButton);
		springLayout.putConstraint(SpringLayout.EAST, cancelButton, Spring.minus(st), 
				SpringLayout.WEST, confirmButton);
		springLayout.putConstraint(SpringLayout.NORTH, cancelButton, 0, 
				SpringLayout.NORTH, confirmButton);	
		
		// make the text field focused every time the window is activated
		addWindowFocusListener(new WindowAdapter() {

			@Override
			public void windowGainedFocus(WindowEvent e) {
				// TODO Auto-generated method stub
				textField.requestFocus();
			}

		});
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		SpringLayout_3 frame = new SpringLayout_3();
		frame.setTitle("使用彈簧布局管理器");
		frame.setVisible(true);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setBounds(100, 100, 600, 300);
	}

}

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