Java Swing JTextfield大小调整(高度)
我在将程序中的JTextfield设置为适当大小时遇到一些问题,我正在尝试用文本“Price must a real value”来修改textfield。这就是我希望它看起来的样子: 这就是我现在的样子: 我的代码如下:Java Swing JTextfield大小调整(高度),java,swing,user-interface,layout-manager,Java,Swing,User Interface,Layout Manager,我在将程序中的JTextfield设置为适当大小时遇到一些问题,我正在尝试用文本“Price must a real value”来修改textfield。这就是我希望它看起来的样子: 这就是我现在的样子: 我的代码如下: package test1; import java.awt.Container; import java.awt.FlowLayout; import javax.swing.*; public class Test1{ //Should componen
package test1;
import java.awt.Container;
import java.awt.FlowLayout;
import javax.swing.*;
public class Test1{
//Should components be final? Should they be defined outside of the class?
private final JTextArea outputArea = new JTextArea();
private final JTextField errorReportField = new JTextField();
private final JPanel inputPanel = new JPanel();
private final JLabel nameLabel = new JLabel("Item Name");
private final JLabel numberLabel = new JLabel("Number of units (or Volume in L)");
private final JLabel priceLabel = new JLabel("Price per unit (or L) in pence");
private final JTextField nameField = new JTextField(10);
private final JTextField numberField = new JTextField(10);
private final JTextField priceField = new JTextField(10);
private final JButton addVolumeButton = new JButton("Add by Volume");
private final JButton addNumberButton = new JButton("Add by number of units");
public Test1() {
JFrame frame = new JFrame("Fuel station shop");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
outputArea.setEditable(false);
outputArea.setRows(30);
JScrollPane scrollPanel = new JScrollPane(outputArea);
scrollPanel.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
errorReportField.setEditable(false);
//Better way of adding multiple components to panel?
inputPanel.setLayout(new FlowLayout());
inputPanel.add(nameLabel);
inputPanel.add(nameField);
inputPanel.add(numberLabel);
inputPanel.add(numberField);
inputPanel.add(priceLabel);
inputPanel.add(priceField);
inputPanel.add(addVolumeButton);
inputPanel.add(addNumberButton);
Container contentPane = frame.getContentPane();
//Why is it adding components from bottom to top?
contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.Y_AXIS));
contentPane.add(scrollPanel);
contentPane.add(errorReportField);
contentPane.add(inputPanel);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
Test1 test = new Test1();
}
}
因此,基本上我希望增加文本字段的高度,同时保持文本居中,以及将背景更改为白色,同时保持其不可编辑。使用
BorderLayout
而不是BoxLayout
将文本区域置于BorderLayout.CENTER
,并使用GridLayout(0,1)
将文本字段和底部面板包装到另一个面板中。将该面板添加到BorderLayout.PAGE\u END
。文本字段的大小将与底部面板的大小相同
旁白
- Swing应用程序应在事件分派线程上运行/启动。看
- 有关布局管理器的常规信息,请参见
- 也不确定为什么字段和文本不可编辑
重构
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import javax.swing.*;
public class Test1{
//Should components be final? Should they be defined outside of the class?
private final JTextArea outputArea = new JTextArea();
private final JTextField errorReportField = new JTextField();
private final JPanel inputPanel = new JPanel();
private final JLabel nameLabel = new JLabel("Item Name");
private final JLabel numberLabel = new JLabel("Number of units (or Volume in L)");
private final JLabel priceLabel = new JLabel("Price per unit (or L) in pence");
private final JTextField nameField = new JTextField(10);
private final JTextField numberField = new JTextField(10);
private final JTextField priceField = new JTextField(10);
private final JButton addVolumeButton = new JButton("Add by Volume");
private final JButton addNumberButton = new JButton("Add by number of units");
public Test1() {
JFrame frame = new JFrame("Fuel station shop");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//outputArea.setEditable(false);
outputArea.setRows(30);
JScrollPane scrollPanel = new JScrollPane(outputArea);
scrollPanel.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
//errorReportField.setEditable(false);
//Better way of adding multiple components to panel?
inputPanel.setLayout(new FlowLayout());
inputPanel.add(nameLabel);
inputPanel.add(nameField);
inputPanel.add(numberLabel);
inputPanel.add(numberField);
inputPanel.add(priceLabel);
inputPanel.add(priceField);
inputPanel.add(addVolumeButton);
inputPanel.add(addNumberButton);
Container contentPane = frame.getContentPane();
//Why is it adding components from bottom to top?
contentPane.setLayout(new BorderLayout());
contentPane.add(scrollPanel);
JPanel wrapper = new JPanel(new GridLayout(0, 1));
wrapper.add(errorReportField);
wrapper.add(inputPanel);
contentPane.add(wrapper, BorderLayout.PAGE_END);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable(){
public void run() {
Test1 test = new Test1();
}
});
}
}
注意 如果希望字段稍微大一点(按高度),可以在
inputPanel
中添加一个空边框,使字段也展开。但这意味着inputPanel
也会稍微大一点(可能需要也可能不需要)。但无论哪种方式,对于GridLayout,字段和inputPanel
的大小都是相同的
inputPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
另一个选项是给包装器
面板一个BorderLayout
并将字段添加到中心,给它一个EmptyBorder
以扩展其大小
contentPane.setLayout(new BorderLayout());
contentPane.add(scrollPanel);
JPanel wrapper = new JPanel(new BorderLayout());
wrapper.add(errorReportField);
wrapper.add(inputPanel, BorderLayout.PAGE_END);
Border border = errorReportField.getBorder();
CompoundBorder compound = BorderFactory.createCompoundBorder(
border,BorderFactory.createEmptyBorder(10, 10, 10, 10));
errorReportField.setBorder(compound);
contentPane.add(wrapper, BorderLayout.PAGE_END);
这将在字段的左侧提供一个轻微的边距(这可能是或可能不是需要的)。如果不需要,只需更改空边框的值即可
createEmptyBorder(top, left, bottom, right)
如果要增加字段的高度,请修改其首选大小(将方法应用于字段):
private void increaseFieldHeight(JTextField field, int times) {
Dimension d = field.getPreferredSize();
d.height = d.height * times;
field.setPreferredSize(d);
}