【发布时间】：2015-04-24 04:01:59
【问题描述】：
所以我一直在工作，学习用 java 编写，我正在接近一个可用的界面，但我遇到了 2 个问题。当我尝试实现覆盖其中的绘制组件的 CloudPanel 时，它不会让我在该面板中设置 gridbaglayout。为了在弄清楚为什么我不能完成的同时尝试让其他所有事情都正常工作，我创建了一个新的基本 JPanel 来填写表单。它几乎是正确的，但它迫使 Price JTextField 离开屏幕的一侧或只是不显示它，而它的标签位于它的行的中心，而不是它应该位于的左侧。任何线索我在这里做错了什么？ ** 编辑 ** 尝试实现在我的应用中显示图像的 2 种方法，但均无效。现在可能被注释掉以测试其他方法的 bLogin jPanel 仍然无法正常工作，需要澄清 setPreferredSize 建议，并且当我将 imageIcon grabbagconstraints 的代码切换到现在显示的内容而不是与其他方法相同时其中，所有 jlabels 和 jtextfields 都重叠。如果我删除了其他 lGUI.add 组件中不存在的所有行，那么它会恢复正常，除了没有图像加载，无论是作为标签还是背景。我在验证方面还有一些工作要做（int 表示 ID，我会说 6 个字符，所以我可以选择我的修改限制，而价格加倍，我可以从中推断出我希望的浮动）。下一步？
package newprovider;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.*;
/*@Michael Christopher, author/owner */
public class NewProvider {
/** @param args the command line arguments*/
public static class CloudPanel extends JPanel {
//paint background
String backgroundPath="/images/CloudBack1.png";
@Override
public void paintComponent(Graphics cloud){
super.paintComponent(cloud);
Image back = new ImageIcon(getClass().getResource(backgroundPath)).getImage();
cloud.drawImage(back, 0,0, this);
}
}
public static void createGUI() {
//build main frame
JFrame mainFrame = new JFrame();
mainFrame.setTitle("New Provider Interface");
// mainFrame.setOpaque(false);
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create the MenuBar - needs menu options
JMenuBar maintenanceMenuBar = new JMenuBar ();
maintenanceMenuBar.setOpaque(true);
maintenanceMenuBar.setBackground(new Color(176,224,230));
maintenanceMenuBar.setPreferredSize(new Dimension(500, 20));
//Create Logo
ImageIcon LogoBox = new ImageIcon("/images/CloudBack.png");
JLabel logoLabel = new JLabel(LogoBox);
//create variables
int addProviderCheck;
String[] options = {"Yes","No"};
String[] newExit = {"Exit", "New"};
Dimension d = new Dimension(400, 224);
//create labels and JTextFields
JLabel labelID = new JLabel ("New ProviderID");
final JTextField textID = new JTextField("providerID ", 20);
JLabel labelName = new JLabel ("New Provider Name");
final JTextField textName = new JTextField("Provider Name ", 20);
JLabel labelPrice = new JLabel ("New Provider Price");
final JTextField textPrice = new JTextField ("Price ", 20);
//make Submit, Clear, & Exit buttons
JButton submit = new JButton("Submit");
JButton clear = new JButton("Clear");
JButton exit = new JButton("Exit");
//build main Panel
CloudPanel bLogin = new CloudPanel();
bLogin.setPreferredSize(d);
//bLogin.setLayout(new GridBagLayout());
bLogin.setOpaque(true);
JPanel Login = new JPanel(new GridBagLayout());
JPanel buttonBar = new JPanel(new GridBagLayout());
buttonBar.setBackground(Color.red);
buttonBar.setSize(40, 400);
Login.setOpaque(false);
//GridBag constraints for buttonBar and InputPane4
GridBagConstraints bGUI = new GridBagConstraints();
//Adding buttons to buttonBar Panel
bGUI.insets = new Insets(5,20,5,20);
bGUI.gridx = 0;
bGUI.gridy = 1;
buttonBar.add(submit,bGUI);
bGUI.gridx = 1;
bGUI.gridy = 1;
buttonBar.add(clear,bGUI);
bGUI.gridx = 2;
bGUI.gridy = 1;
buttonBar.add(exit,bGUI);
//GridBag Adding Labels and Text to Login with Constraints
GridBagConstraints lGUI = new GridBagConstraints();
lGUI.insets = new Insets(50,15,0,0);
lGUI.anchor = GridBagConstraints.NORTH;
lGUI.fill = GridBagConstraints.BOTH;
lGUI.ipady = 100;
lGUI.weighty = 1.0;
lGUI.gridx = 0;
lGUI.gridwidth = 3;
lGUI.gridy = 0;
Login.add(logoLabel, lGUI);
lGUI.anchor = GridBagConstraints.WEST;
lGUI.gridx = 0;
lGUI.gridy = 1;
Login.add(labelID,lGUI);
lGUI.anchor = GridBagConstraints.EAST;
lGUI.gridx = 2;
lGUI.gridy = 1;
Login.add(textID,lGUI);
lGUI.anchor = GridBagConstraints.WEST;
lGUI.gridx = 0;
lGUI.gridy = 3;
Login.add(labelName,lGUI);
lGUI.anchor = GridBagConstraints.EAST;
lGUI.gridx = 2;
lGUI.gridy = 3;
Login.add(textName,lGUI);
lGUI.anchor = GridBagConstraints.WEST;
lGUI.gridx = 0;
lGUI.gridy = 5;
Login.add(labelPrice,lGUI);
lGUI.anchor = GridBagConstraints.EAST;
lGUI.gridx = 2;
lGUI.gridy = 5;
Login.add(textPrice,lGUI);
//add panels to frame
mainFrame.add(maintenanceMenuBar, BorderLayout.NORTH);
//bLogin.add(Login, BorderLayout.CENTER);
//mainFrame.add(bLogin, BorderLayout.CENTER);
mainFrame.add(Login, BorderLayout.CENTER);
mainFrame.add(buttonBar, BorderLayout.SOUTH);
SwingUtilities.invokeLater(new FocusGrabber(clear));
//empty fields on mouse clicks
textID.addMouseListener(new MouseListener() { @Override
public void mouseClicked(MouseEvent e) {textID.setText("");}
@Override public void mousePressed(MouseEvent e) { //throw new UnsupportedOperationException("Not supported yet.");
}@Override public void mouseReleased(MouseEvent e) { //throw new UnsupportedOperationException("Not supported yet.");
}@Override public void mouseEntered(MouseEvent e) { //throw new UnsupportedOperationException("Not supported yet.");
}@Override public void mouseExited(MouseEvent e) { //throw new UnsupportedOperationException("Not supported yet.");
} } );
textName.addMouseListener(new MouseListener() { @Override
public void mouseClicked(MouseEvent e) {textName.setText("");}
@Override public void mousePressed(MouseEvent e) { //throw new UnsupportedOperationException("Not supported yet.");
}@Override public void mouseReleased(MouseEvent e) { //throw new UnsupportedOperationException("Not supported yet.");
}@Override public void mouseEntered(MouseEvent e) { //throw new UnsupportedOperationException("Not supported yet.");
}@Override public void mouseExited(MouseEvent e) { //throw new UnsupportedOperationException("Not supported yet.");
} } );
textPrice.addMouseListener(new MouseListener() { @Override
public void mouseClicked(MouseEvent e) {textPrice.setText("");}
@Override public void mousePressed(MouseEvent e) { //throw new UnsupportedOperationException("Not supported yet.");
}@Override public void mouseReleased(MouseEvent e) { //throw new UnsupportedOperationException("Not supported yet.");
}@Override public void mouseEntered(MouseEvent e) { //throw new UnsupportedOperationException("Not supported yet.");
}@Override public void mouseExited(MouseEvent e) { //throw new UnsupportedOperationException("Not supported yet.");
} } );
//focusListeners for Name Field
textName.addFocusListener(new FocusListener(){ @Override
public void focusGained(FocusEvent e) { /* throw new UnsupportedOperationException("Not supported yet.");*/ }
@Override public void focusLost(FocusEvent e) {
if (!e.isTemporary()) {
String checkName = textName.getText();
Boolean validName = false;
if (checkName.isEmpty()){JOptionPane.showMessageDialog(mainFrame, "Please enter a valid ID.");}
else while (validName = false){try {
String Name = textName.getText();
}catch (NumberFormatException e1){
JOptionPane.showMessageDialog(mainFrame, "Please enter a valid ID.");
SwingUtilities.invokeLater(new FocusGrabber(textName));
}finally {validName = true;}
} } } } );
//ActionListener for Submit button
submit.addActionListener((ActionEvent e) -> {
String Name;
Name = textName.getText();
int ID = Integer.parseInt(textID.getText());
double Price = Double.parseDouble(textPrice.getText());
int submitPress = JOptionPane.showOptionDialog(null,
"ProviderID: " + ID + "\n" + "Provider Name: " + Name +"\n"
+ "Provider Price: " + Price, "Please Verify Content",
JOptionPane.YES_NO_OPTION,JOptionPane.WARNING_MESSAGE,
null, options,options[0]);
if (submitPress <= 0) {
//Store Displayed data
int providerID = ID;
String providerName = Name;
Double providerPrice = Price;
System.out.println(providerID);
System.out.println(providerName);
System.out.println(providerPrice);//add method to store println()s to database
//Popup Confirm dialog to reset fields or exit
int confirmNew = JOptionPane.showOptionDialog(null, "New Provider Confirmed\n" + "Would you like to exit the module or add another provider?", "Confirmation", JOptionPane.YES_NO_OPTION, JOptionPane.WARNING_MESSAGE, null, newExit, newExit[0]);
if (confirmNew <=0) {
mainFrame.setVisible(false);
mainFrame.dispose();
} else if (confirmNew > 0) {
textID.setText("providerID");
textName.setText("Provider Name");
textPrice.setText("Price");
} }
else if (submitPress > 0) {
textID.setText("providerID");
textName.setText("Provider Name");
textPrice.setText("Price"); }
});
//ActionListener for clear button
clear.addActionListener((ActionEvent e) -> {
textID.setText("providerID");
textName.setText("Provider Name");
textPrice.setText("Price");
});
//ActionListener for Exit Button
exit.addActionListener((ActionEvent e) -> {
mainFrame.setVisible(false);
mainFrame.dispose();
});
//verify intent to add new provider to system before continuing
addProviderCheck = JOptionPane.showOptionDialog(null,
"This will add a new service provider to the database.\n"
+ "Are you sure you wish to continue?",
"Please Verify Intent",JOptionPane.YES_NO_OPTION,JOptionPane.QUESTION_MESSAGE,null, options,options[0]);
if (addProviderCheck <= 0) {
//Display Window
mainFrame.pack();
mainFrame.setSize(400, 400);
mainFrame.setVisible(true);}
else { //else close app
mainFrame.setVisible(false);
mainFrame.dispose();
}
// mainFrame.setVisible(true);
}
public static void main(String[] args){
//draw and show the GUI
javax.swing.SwingUtilities.invokeLater(() -> {
createGUI();
});
//store new provider data
}
} Ive got it working (after manual resize) - well, the image as a logo is working, not the background. I've tried defining the size different places and none of them are changing it, it starts to small and once I resize it slightly wider and nearly twice as tall it then snaps to proper alignment. Here's the pieces I added:
mainFrame.setSize(new Dimension(800,425));
ImageIcon LogoBox = new ImageIcon("images/CloudBack.png");
JLabel logoLabel = new JLabel(LogoBox);
//create panel to stack logo and login
JPanel logFrame = new JPanel(new GridBagLayout());
logFrame.setOpaque(false); [....Unchanged code...]
JPanel Login = new JPanel(new GridBagLayout());
Login.setSize(800, 425);
JPanel buttonBar = new JPanel(new GridBagLayout());
buttonBar.setBackground(Color.red);
buttonBar.setSize(40, 400);
Login.setOpaque(false); [....Unchanged code....]
Login.add(textPrice,lGUI);
//GridBag Adding login and logo to panel
GridBagConstraints pGUI = new GridBagConstraints();
pGUI.insets = new Insets(5,10,15,20);
pGUI.anchor = GridBagConstraints.CENTER;
pGUI.fill = GridBagConstraints.BOTH;
pGUI.ipady = 400;
pGUI.weighty = 1.0;
pGUI.gridx = 0;
pGUI.gridy = 0;
logFrame.add(logoLabel, pGUI);
pGUI.anchor = GridBagConstraints.SOUTH;
pGUI.gridx = 0;
pGUI.gridy = 1;
logFrame.add(Login, pGUI); [....Unchanged Code....]
mainFrame.add(logFrame, BorderLayout.CENTER); [....Unchanged Code....]
【问题讨论】：
标签： java image background alignment gridbaglayout