[英]Swing adding more lines in the GUI, and background not showing
I have created a GUI with the help of another thread to format it properly. 我已经在另一个线程的帮助下创建了一个GUI,以对其进行正确格式化。 Thing is now I want to add another line for a 'back button'. 现在,我想为“后退按钮”添加另一行。 When I create the panel and add it it doesn't show unless I remove another JPanel from the rootPanel
. 创建面板并添加面板时,除非从rootPanel
删除另一个JPanel,否则它不会显示。 If I change the parameters of the GridLayout
for the rootPanel
to 0, 2, 0, 0 rather than 0, 1, 0, 0 it becomes completely unformatted. 如果我将rootPanel
的GridLayout
的参数更改为rootPanel
而不是rootPanel
,则它会变得完全未格式化。 Any ideas? 有任何想法吗?
Another problem is the code frame.setContentPane(background);
另一个问题是代码frame.setContentPane(background);
originally set the background for the GUI, however with this new code it no longer does. 最初设置了GUI的背景,但是使用此新代码,它将不再起作用。 Any ideas on how to fix this as well? 关于如何解决此问题的任何想法?
public class TimerMenu {
private JFrame frame;
private JPanel rootPanel, logoPanel, mainPanel, backButtonPanel; // JPanel = 'parts' that build up the JFrame
private JLabel background, logo, timeText;
private JButton startTimerButton, backButton;
private JComboBox timeUnitChoice;
public TimerMenu() {
frame = new JFrame("Timer");
startTimerButton = new JButton("Start Timer");
startTimerButton.setPreferredSize(new Dimension(135, 30));
startTimerButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(null, "This feature hasn't been implemented yet.", "We're sorry!", JOptionPane.ERROR_MESSAGE);
}
});
backButton = new JButton("Back to Main Menu");
backButton.setPreferredSize(new Dimension(135, 30));
backButton.setForeground(Color.RED);
backButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
// Opening main menu.
frame.dispose();
new MainMenu();
}
});
// Creating drop down menu.
String[] timeChoices = {"Nanoseconds", "Microseconds", "Milliseconds", "Seconds", "Minutes", "Hours", "Days"};
// Giving the choices from the array of 'timeChoices'
timeUnitChoice = new JComboBox(timeChoices);
// Setting the default option to 'Minutes' (4th choice, starting at 0 as its an array!)
timeUnitChoice.setSelectedIndex(4);
try {
background = new JLabel(new ImageIcon(ImageIO.read(getClass()
.getResourceAsStream("/me/devy/alarm/clock/resources/background.jpg"))));
logo = new JLabel(new ImageIcon(ImageIO.read(getClass()
.getResourceAsStream("/me/devy/alarm/clock/resources/timer.png"))));
} catch (IOException e) {
e.printStackTrace();
}
// Creating simple text
background.setLayout(new BorderLayout());
frame.setContentPane(background);
// Creating the root panel (will combined all the panels)
rootPanel = new JPanel();
frame.getContentPane().add(rootPanel, BorderLayout.NORTH);
// Giving it a GridLayout of (0, 1, 0, 0), this makes it that every panel
// has their own row in the GUI
rootPanel.setLayout(new GridLayout(0, 1, 0, 0));
// Creating the logo panel with a flow layout (keeps all components on one line goes onto the next if needed)
logoPanel = new JPanel(new FlowLayout());
rootPanel.add(logoPanel);
logoPanel.add(logo);
// Creating the main panel, same as above.
mainPanel = new JPanel(new FlowLayout());
rootPanel.add(mainPanel);
timeText = new JLabel("Length:"); // Creating text on the GUI.
mainPanel.add(timeUnitChoice);
mainPanel.add(timeText);
mainPanel.add(startTimerButton);
// Creating the back button panel, same as above (logoPanel).
backButtonPanel = new JPanel(new FlowLayout());
rootPanel.add(backButtonPanel);
backButtonPanel.add(backButton);
// Setting some frame properties.
frame.setVisible(true);
frame.setSize(550, 250);
frame.setResizable(false);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
You can add background to your application by these ways 您可以通过以下方式为应用程序添加背景
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class BackgroundImageJFrame extends JFrame
{
JButton b1;
JLabel l1;
public BackgroundImageJFrame()
{
setTitle("Background Color for JFrame");
setSize(400,400);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
/*
One way
-----------------
setLayout(new BorderLayout());
JLabel background=new JLabel(new ImageIcon("C:\\Users\\Computer\\Downloads\\colorful design.png"));
add(background);
background.setLayout(new FlowLayout());
l1=new JLabel("Here is a button");
b1=new JButton("I am a button");
background.add(l1);
background.add(b1);
*/
// Another way
setLayout(new BorderLayout());
setContentPane(new JLabel(new ImageIcon("C:\\Users\\Computer\\Downloads\\colorful design.png")));
setLayout(new FlowLayout());
l1=new JLabel("Here is a button");
b1=new JButton("I am a button");
add(l1);
add(b1);
// Just for refresh :) Not optional!
setSize(399,399);
setSize(400,400);
}
public static void main(String args[])
{
new BackgroundImageJFrame();
}
}
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