Layout - BorderLayout, FlowLayout, GridLayout

BorderLayout


BorderLayout - Example

除了常見的東西南北中發白之外 再加上Hgap與VGap兩個屬性


import java.awt.BorderLayout;
import java.awt.Container;

import javax.swing.JButton;
import javax.swing.JFrame;


public class TestBorderLayout {
public static void main(String[] args) {
JFrame frame = new JFrame("BorderLayout");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container cp = frame.getContentPane();

BorderLayout layout = new BorderLayout();
layout.setHgap(100);
layout.setVgap(30);
cp.setLayout(layout);

JButton north = new JButton("North");
JButton south = new JButton("South");
JButton east = new JButton("East");
JButton west = new JButton("West");
JButton center = new JButton("Center");

cp.add(north, BorderLayout.NORTH);
cp.add(south, BorderLayout.SOUTH);
cp.add(east, BorderLayout.EAST);
cp.add(west, BorderLayout.WEST);
cp.add(center, BorderLayout.CENTER);

frame.setVisible(true);
frame.pack();
}

}

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FlowLayout - Example

預設值除了Hgap與VGrap外多了一個Alignment

import java.awt.Color;

import java.awt.Container;

import java.awt.FlowLayout;

import javax.swing.JButton;

import javax.swing.JFrame;

public class TestFlowLayout {

public static void main(String[] args) {

JFrame frame = new JFrame("FlowLayout");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Container cp = frame.getContentPane();

FlowLayout layout = new FlowLayout(FlowLayout.CENTER, 10, 10); 

// DEFAULT is (CENTER, 5, 5)

cp.setLayout(layout);

JButton btn[] = new JButton[10];

for(int i = 0 ; i < btn.length; i++){

btn[i] = createBtn(i);

cp.add(btn[i]);

}

frame.setVisible(true);

frame.pack();

}

private static JButton createBtn(int i) {

JButton btn = new JButton();

Color bg = new Color(i*256/10,i*256/10,i*256/10);

btn.setText(""+(i*256/10));

btn.setForeground(bg);

return btn;

}

}

靠左,中,右對齊

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GridLayout 

不得不說的事情是當我們放元件進去的時候是無法指定他放在grid的什麼位置的

因為這個layout的排版方式就是將parent裡面的所有元件拿來依照指定的gird size來排位置

import java.awt.Container;

import java.awt.GridLayout;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

public class TestGridLayout {

public static void main(String[] args) {

JFrame frame = new JFrame("FlowLayout");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Container cp = frame.getContentPane();

// DEFAULT is (1, 0, 0, 0);

GridLayout layout = new GridLayout(5, 5, 10, 10);

cp.setLayout(layout);

for(int i = 0 ; i < 25 ; i++){

if(i%2 == 0){

cp.add(new JButton(""+i));

}else{

cp.add(new JLabel());

}

}

frame.setVisible(true);

frame.pack();

}

}