我尝试创建一些用于监视网络的应用程序。我将创建4 JPanels
并插入面板insert_panel_0
,insert_panel_2
至panel_2
。我无法在insert_panel_0
,insert_panel_2
之间设置边框。我有垂直缝隙,但没有水平缝隙。
您能帮我解决吗?
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.Toolkit;
import javax.swing.JFrame;
import javax.swing.JLayeredPane;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
public class setting {
public static void main(String[] args) {
//get size window
Dimension tk = Toolkit.getDefaultToolkit().getScreenSize();
int width = (int) tk.width;
int hight = (int) tk.height;
JFrame frame = new JFrame();
frame.setLayout(new GridLayout(1,4, 0, 0));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setBackground(Color.black);
frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
// set panels for window
JPanel panel_0 = new JPanel();
panel_0.setLayout(new FlowLayout(FlowLayout.CENTER, 0, 0));
panel_0.setBorder(new EmptyBorder(20, 20,20, 20));
panel_0.setBackground(Color.white);
frame.add(panel_0);
JPanel panel_1 = new JPanel();
panel_1.setLayout(new FlowLayout(FlowLayout.CENTER, 0, 0));
panel_1.setBackground(Color.yellow);
panel_1.setBorder(new EmptyBorder(20, 20,20, 20));
frame.add(panel_1);
JPanel panel_2 = new JPanel();
panel_2.setLayout(new FlowLayout(FlowLayout.CENTER, 0, 0));
panel_2.setBorder(new EmptyBorder(20, 20,20, 20));
panel_2.setBackground(Color.green);
frame.add(panel_2);
JPanel panel_3 = new JPanel();
panel_3.setLayout(new FlowLayout(FlowLayout.CENTER, 0, 0));
panel_3.setBorder(new EmptyBorder(20, 20,20, 20));
panel_3.setBackground(Color.blue);
frame.add(panel_3);
JPanel insert_panel_0 = new JPanel();
insert_panel_0.setPreferredSize( new Dimension(width/4, (int) Math.round( hight*0.05)));
insert_panel_0.setBackground(Color.black);
panel_2.add(insert_panel_0);
JPanel insert_panel_1 = new JPanel();
insert_panel_1.setPreferredSize( new Dimension(width/4, (int) Math.round( hight*0.05)));
insert_panel_1.setBackground(Color.black);
panel_2.add(insert_panel_1);
frame.setVisible(true);
}
}
GridLayout具有设置水平和垂直间隙的方法:setHgap(hgap)
和setVGap(vgap)
。或者,您可以在构造函数中创建布局时提供它们:new GridLayout(rows, cols, hgap, vgap)
希望有帮助。
您可以使用GridBagLayout并使用Insets。但是,这带来了一个新问题:
[您需要考虑]在计算insert_panel_0
和insert_panel_1
的尺寸时的插入物尺寸,因为如果总尺寸(insert_panel_0_size + insert_panel_1_size +插入物)大于父级(panel_2_size),insert_panel_0
和insert_panel_1
的大小将不合适。
构造函数和描述:(来自java-docs):
Insets(int top, int left, int bottom, int right)
用指定的上,左,下,和右插图。
与您的问题无关,但是在Java GUI中,您应该始终从事件调度线程中调用GUI。当您开始在GUI中获取更复杂/动态更新的值时,这将帮助您避免不必要的行为。
您修改后的代码(您必须使用Dimension公式,我将其注释掉是因为:懒惰:]]
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.Toolkit;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
public class Test {
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createGUI();
}
});
}
public static void createGUI() {
//get size window
Dimension tk = Toolkit.getDefaultToolkit().getScreenSize();
int width = (int) tk.width;
int hight = (int) tk.height;
JFrame frame = new JFrame();
frame.setLayout(new GridLayout(1,4, 0, 0));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setBackground(Color.black);
frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
// set panels for window
JPanel panel_0 = new JPanel();
panel_0.setLayout(new FlowLayout(FlowLayout.CENTER, 0, 0));
panel_0.setBorder(new EmptyBorder(20, 20,20, 20));
panel_0.setBackground(Color.white);
frame.add(panel_0);
JPanel panel_1 = new JPanel();
panel_1.setLayout(new FlowLayout(FlowLayout.CENTER, 0, 0));
panel_1.setBackground(Color.yellow);
panel_1.setBorder(new EmptyBorder(20, 20,20, 20));
frame.add(panel_1);
JPanel panel_2 = new JPanel();
panel_2.setLayout(new GridBagLayout());
panel_2.setBorder(new EmptyBorder(20, 20,20, 20));
panel_2.setBackground(Color.green);
frame.add(panel_2);
JPanel panel_3 = new JPanel();
panel_3.setLayout(new FlowLayout(FlowLayout.CENTER, 0, 0));
panel_3.setBorder(new EmptyBorder(20, 20,20, 20));
panel_3.setBackground(Color.blue);
frame.add(panel_3);
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets = new Insets(0,5,0,5); // Horizontal padding only
JPanel insert_panel_0 = new JPanel();
//insert_panel_0.setPreferredSize( new Dimension((width/4), (int) Math.round( hight*0.05)));
insert_panel_0.setPreferredSize(new Dimension(200, 100));
insert_panel_0.setBackground(Color.black);
gbc.gridx = 0;
gbc.gridy = 0;
panel_2.add(insert_panel_0, gbc);
JPanel insert_panel_1 = new JPanel();
//insert_panel_1.setPreferredSize( new Dimension(width/4 - 10, (int) Math.round( hight*0.05)));
insert_panel_1.setPreferredSize(new Dimension(200, 100));
insert_panel_1.setBackground(Color.black);
gbc.gridx = 1;
gbc.gridy = 0;
panel_2.add(insert_panel_1, gbc);
frame.setVisible(true);
}
}