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Swing BorderLayout佈局

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BorderLayout類排列的組成部分，以適應在五個區域：東部，西部，北部，南部和中心。每個區域只能包含一個組件，每個組件在每個區域確定相應的固定NORTH，SOUTH，EAST，WEST，和CENTER。

類聲明

以下是聲明 java.awt.BorderLayout類：

public class BorderLayout extends Object implements LayoutManager2, Serializable

字段域

下面是java.awt.BorderLayout類的字段：

  • static String AFTER_LAST_LINE -- Synonym for PAGE_END.

  • static String AFTER_LINE_ENDS -- Synonym for LINE_END.

  • static String BEFORE_FIRST_LINE -- Synonym for PAGE_START.

  • static String BEFORE_LINE_BEGINS -- Synonym for LINE_START.

  • static String CENTER -- The center layout constraint (middle of container).

  • static String EAST -- The east layout constraint (right side of container).

  • static String LINE_END -- The component goes at the end of the line direction for the layout.

  • static String LINE_START -- The component goes at the beginning of the line direction for the layout.

  • static String NORTH -- The north layout constraint (top of container).

  • static String PAGE_END -- The component comes after the last line of the layout's content.

  • static String PAGE_START -- The component comes before the first line of the layout's content.

  • static String SOUTH -- The south layout constraint (bottom of container).

  • static String WEST -- The west layout constraint (left side of container).

類構造函數

S.N.

構造函數 & 描述

1

BorderLayout()
Constructs a new border layout with no gaps between components.

2

BorderLayout(int hgap, int vgap)
Constructs a border layout with the specified gaps between components.

類方法

S.N.

方法 & 描述

1

void addLayoutComponent(Component comp, Object constraints)
Adds the specified component to the layout, using the specified constraint object.

2

void addLayoutComponent(String name, Component comp)
If the layout manager uses a per-component string, adds the component comp to the layout, associating it with the string specified by name.

3

int getHgap()
Returns the horizontal gap between components.

4

float getLayoutAlignmentX(Container parent)
Returns the alignment along the x axis.

5

float getLayoutAlignmentY(Container parent)
Returns the alignment along the y axis.

6

int getVgap()
Returns the vertical gap between components.

7

void invalidateLayout(Container target)
Invalidates the layout, indicating that if the layout manager has cached information it should be discarded.

8

void layoutContainer(Container target)

9

Dimension maximumLayoutSize(Container target)
Returns the maximum dimensions for this layout given the components in the specified target container.

10

Dimension minimumLayoutSize(Container target)
Determines the minimum size of the target container using this layout manager.

11

Dimension preferredLayoutSize(Container target)
Determines the preferred size of the target container using this layout manager, based on the components in the container.

12

void removeLayoutComponent(Component comp)
Removes the specified component from this border layout.

13

void setHgap(int hgap)
Sets the horizontal gap between components.

14

void setVgap(int vgap)
Sets the vertical gap between components.

15

String toString()
Returns a string representation of the state of this border layout.

方法繼承

這個類從以下類繼承的方法：

  • java.lang.Object

BorderLayout 例子

選擇使用任何編輯器創建以下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.showBorderLayoutDemo(); } 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 showBorderLayoutDemo(){ headerLabel.setText("Layout in action: BorderLayout"); JPanel panel = new JPanel(); panel.setBackground(Color.darkGray); panel.setSize(300,300); BorderLayout layout = new BorderLayout(); layout.setHgap(10); layout.setVgap(10); panel.setLayout(layout); panel.add(new JButton("Center"),BorderLayout.CENTER); panel.add(new JButton("Line Start"),BorderLayout.LINE_START); panel.add(new JButton("Line End"),BorderLayout.LINE_END); panel.add(new JButton("East"),BorderLayout.EAST); panel.add(new JButton("West"),BorderLayout.WEST); panel.add(new JButton("North"),BorderLayout.NORTH); panel.add(new JButton("South"),BorderLayout.SOUTH); controlPanel.add(panel); mainFrame.setVisible(true); } }

編譯程序，使用命令提示符。到 D:/ > SWING 然後輸出以下命令。

D:SWING>javac comyiibaiguiSwingLayoutDemo.java

如果沒有錯誤出現，這意味着編譯成功。使用下面的命令來運行程序。

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

驗證下面的輸出

SWING

Swing LayoutManager2接口
Swing CardLayout佈局