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Swing GroupLayout布局类

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GroupLayout类的分层组组件为了放置他们在一个容器。

类声明

以下是声明 javax.swing.GroupLayout类：

public class GroupLayout
   extends Object
      implements LayoutManager2

字段域

以下是javax.swing.GroupLayout类的字段域：

  • static int DEFAULT_SIZE -- 表示组件或间隙的大小应该用于特定的范围值。

  • static int PREFERRED_SIZE -- 表示组件或间隙的首选大小应该用于特定的范围值。

类构造函数

S.N. 构造函数 & 描述
1 GroupLayout(Container host) 
Creates a GroupLayout for the specified Container.

类方法

S.N. 方法 & 描述
1 void addLayoutComponent(Component component, Object constraints) 
Notification that a Component has been added to the parent container.
2 void addLayoutComponent(String name, Component component) 
Notification that a Component has been added to the parent container.
3 GroupLayout.ParallelGroup createBaselineGroup(boolean resizable, boolean anchorBaselineToTop) 
Creates and returns a ParallelGroup that aligns it's elements along the baseline.
4 GroupLayout.ParallelGroup createParallelGroup() 
Creates and returns a ParallelGroup with an alignment of Alignment.LEADING.
5 GroupLayout.ParallelGroup createParallelGroup(GroupLayout.Alignment alignment) 
Creates and returns a ParallelGroup with the specified alignment.
6 GroupLayout.ParallelGroup createParallelGroup(GroupLayout.Alignment alignment, boolean resizable) 
Creates and returns a ParallelGroup with the specified alignment and resize behavior.
7 GroupLayout.SequentialGroup createSequentialGroup() 
Creates and returns a SequentialGroup.
8 boolean getAutoCreateContainerGaps() 
Returns true if gaps between the container and components that border the container are automatically created.
9 boolean getAutoCreateGaps() 
Returns true if gaps between components are automatically created.
10 boolean getHonorsVisibility() 
Returns whether component visiblity is considered when sizing and positioning components.
11 float getLayoutAlignmentX(Container parent) 
Returns the alignment along the x axis.
12 float getLayoutAlignmentY(Container parent) 
Returns the alignment along the y axis.
13 LayoutStyle getLayoutStyle() 
Returns the LayoutStyle used for calculating the preferred gap between components.
14 void invalidateLayout(Container parent) 
Invalidates the layout, indicating that if the layout manager has cached information it should be discarded.
15 void layoutContainer(Container parent) 
Lays out the specified container.
16 void linkSize(Component... components) 
Forces the specified components to have the same size regardless of their preferred, minimum or maximum sizes.
17 void linkSize(int axis, Component... components) 
Forces the specified components to have the same size along the specified axis regardless of their preferred, minimum or maximum sizes.
18 Dimension maximumLayoutSize(Container parent) 
Returns the maximum size for the specified container.
19 Dimension minimumLayoutSize(Container parent) 
Returns the minimum size for the specified container.
20 Dimension preferredLayoutSize(Container parent) 
Returns the preferred size for the specified container.
21 void removeLayoutComponent(Component component) 
Notification that a Component has been removed from the parent container.
22 void replace(Component existingComponent, Component newComponent) 
Replaces an existing component with a new one.
23 void setAutoCreateContainerGaps(boolean autoCreateContainerPadding) 
Sets whether a gap between the container and components that touch the border of the container should automatically be created.
24 void setAutoCreateGaps(boolean autoCreatePadding) 
Sets whether a gap between components should automatically be created.
25 void setHonorsVisibility(boolean honorsVisibility) 
Sets whether component visiblity is considered when sizing and positioning components.
26 void setHonorsVisibility(Component component, Boolean honorsVisibility) 
Sets whether the component's visiblity is considered for sizing and positioning.
27 void setHorizontalGroup(GroupLayout.Group group) 
Sets the Group that positions and sizes components along the horizontal axis.
28 void setLayoutStyle(LayoutStyle layoutStyle) 
Sets the LayoutStyle used to calculate the preferred gaps between components.
29 void setVerticalGroup(GroupLayout.Group group) 
Sets the Group that positions and sizes components along the vertical axis.
30 String toString() 
Returns a string representation of this GroupLayout.

方法继承

这个类从以下类继承的方法：

  • java.lang.Object

GroupLayout 实例

选择使用任何编辑器创建以下java程序在 D:/ > SWING > com > yiibai > gui >

SwingLayoutDemo.java 
package com.yiibai.gui;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class SwingLayoutDemo {
   private JFrame mainFrame;
   private JLabel headerLabel;
   private JLabel statusLabel;
   private JPanel controlPanel;
   private JLabel msglabel;

   public SwingLayoutDemo(){
      prepareGUI();
   }

   public static void main(String[] args){
      SwingLayoutDemo swingLayoutDemo = new SwingLayoutDemo();  
      swingLayoutDemo.showGroupLayoutDemo();       
   }
      
   private void prepareGUI(){
      mainFrame = new JFrame("Java SWING Examples");
      mainFrame.setSize(400,400);
      mainFrame.setLayout(new GridLayout(3, 1));

      headerLabel = new JLabel("",JLabel.CENTER );
      statusLabel = new JLabel("",JLabel.CENTER);        

      statusLabel.setSize(350,100);
      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
	        System.exit(0);
         }        
      });    
      controlPanel = new JPanel();
      controlPanel.setLayout(new FlowLayout());

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);  
   }

   private void showGroupLayoutDemo(){
      headerLabel.setText("Layout in action: GroupLayout");      

      JPanel panel = new JPanel();
      // panel.setBackground(Color.darkGray);
      panel.setSize(200,200);
      GroupLayout layout = new GroupLayout(panel);
      layout.setAutoCreateGaps(true);
      layout.setAutoCreateContainerGaps(true);
      JButton btn1 = new JButton("Button 1");
      JButton btn2 = new JButton("Button 2");
      JButton btn3 = new JButton("Button 3");

      layout.setHorizontalGroup(layout.createSequentialGroup()
         .addComponent(btn1)
         .addGroup(layout.createSequentialGroup()
            .addGroup(layout.createParallelGroup(
               GroupLayout.Alignment.LEADING)
               .addComponent(btn2)
               .addComponent(btn3)       
            )
         )    
      );


      layout.setVerticalGroup(layout.createSequentialGroup()
         .addComponent(btn1)
         .addComponent(btn2)
         .addComponent(btn3)                                    
      );
      panel.setLayout(layout);        
      controlPanel.add(panel);

      mainFrame.setVisible(true);  
   }
}

编译程序，使用命令提示符。到 D:/ > SWING 然后输出以下命令。

D:SWING>javac comyiibaiguiSwingLayoutDemo.java

如果没有错误出现，这意味着编译成功。使用下面的命令来运行程序。

D:SWING>java com.yiibai.gui.SwingLayoutDemo

验证下面的输出

SWING GroupLayout
 


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