我一直在努力让GUI继续用于我正在处理的应用程序,并且,自从在Swing中做任何事情以来,已经过了很多年.大多数东西都回来了,但不是这样.我无法理解为什么,在所有不同的文本组件中,如果我在其中输入内容,getText()将始终返回"".如果我使用setText()作为测试,它将正确返回,但这并不是真的有用.
这在JTextArea/JTextField中保持一致,引用文本字段的各种方式(直接变量与从HashMap中提取),并且无论访问什么类型的线程.有时我使用调试器尝试通过其他测试片段来查看事物,但仍然没有.自从编辑以来,已经修剪了很多这些案例,但仍然存在问题.
在所有情况下,永远不会获得用户输入.
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class LifePathUI2 {
final static boolean shouldWeightX = true;
private GridBagConstraints cons;
private BorderLayout windowLayout;
private GridBagLayout layout;
private JFrame mainWindow;
private JPanel mainPanel;
private JComponent currentComponent;
private JTextField characterName;
/**
* @throws HeadlessException
*/
public LifePathUI2() throws HeadlessException {
cons = new GridBagConstraints();
windowLayout = new BorderLayout();
layout = new GridBagLayout();
mainWindow = new JFrame();
mainPanel = new JPanel();
mainWindow.setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
init();
}
public void init()
{
mainWindow.setComponentOrientation(ComponentOrientation.LEFT_TO_RIGHT);
mainWindow.setLayout(windowLayout);
cons.ipadx = 5;
cons.ipady = 5;
cons.anchor = GridBagConstraints.NORTHWEST;
cons.fill = GridBagConstraints.NONE;
cons.weighty = 1.0;
cons.weightx = 1.0;
// to make everything work right we add a mainPanel under the mainWindow
cons.gridheight = 1;
cons.gridwidth = 1;
mainWindow.add(mainPanel);
// Readers keep in mind if you don't set this below, strange behavior happens
mainPanel.setComponentOrientation(ComponentOrientation.LEFT_TO_RIGHT);
mainPanel.setLayout(layout);
currentComponent = mainPanel;
addLabel(0,0,"Character Name");
characterName = addTextF(1,0,"",30,true);
endRow(2,0);
addButton(0,1,"Foo").addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
System.out.println(characterName.getText());
}
});
endVertical(0,2);
mainWindow.setSize(1400, 900);
mainWindow.setVisible(true);
}
/**
* Inserts a spacer to signify the end of components for this row (effects layout so it doesn't center)
*/
private void endRow(int x, int y)
{
cons.weightx = 100.0;
addLabel(x,y,"");
cons.weightx = 1.0;
}
/**
* Inserts a spacer to signify the end of components vertically (effects layout so it doesn't center)
*/
private void endVertical(int x, int y)
{
cons.weighty = 100.0;
addLabel(x,y,"");
cons.weighty = 1.0;
}
/**
* Shorthand command to add label at coordinates with text
* @param x non-negative integer
* @param y non-negative integer
* @param text Display Text for label
*/
private JLabel addLabel(int x, int y, String text)
{
JLabel temp = new JLabel(text);
addC(temp,x,y);
return temp;
}
/**
* Shorthand command to add Button at coordinates with text
* @param x non-negative integer
* @param y non-negative integer
* @param text Display Text for Button
* @return The component created
*/
private JButton addButton(int x, int y, String text)
{
JButton temp = new JButton(text);
addC(temp,x,y);
return temp;
}
/**
* Shorthand command to add Text Field at coordinates with text
* @param x non-negative integer
* @param y non-negative integer
* @param value the default value for the text field
* @param cols Number of Columns
* @param updateListen If true will add listener that triggers UI updates when values change
* @return The component created
*/
private JTextField addTextF(int x, int y, String value, int cols, boolean updateListen)
{
JTextField temp = new JTextField(value, cols);
// this prevents the common issue of the text fields turning into slits
temp.setMinimumSize(temp.getPreferredSize());
addC(temp,x,y);
return temp;
}
/**
* Shorthand to add new components to the UI tab at given coords
* @param comp Component to add to UI
* @param x non-negative integer
* @param y non-negative integer
*
*/
private void addC(JComponent comp, int x, int y) {
cons.gridx = x;
cons.gridy = y;
currentComponent.add(comp,cons);
}
/**
* @param args
*/
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
LifePathUI2 ui = new LifePathUI2();
ui.init();
}
});
}
}
我在这里搜索了每个问题以寻找摆动的东西,但没有一个问题似乎特别对应于这个问题.并不完全是在期待.
我为更大的片段道歉,但由于所有部分立即围绕创建文本字段,阅读它们,创建GUI本身,所有似乎都与我在网上看到的例子相符......我只是很聪明地知道那里一定是奇怪的我在这里做的,只是没有看到它.
编辑:简化示例.尽管打破了这个更简单的测试用例,仍然没有骰子EDIT2:完成压缩的东西.我实际上期待这个工作,因为这是我之前编写的工作代码级别.但仍然没有
一个疯狂的猜测,但你的update()方法看起来可能是试图从它收听的文件中提取文本(你没有说),如果是,那么使用DocumentEvent获取文档,然后提取文本.就像是:
private class TextChangeListener implements DocumentListener {
@Override
public void changedUpdate(DocumentEvent e) {
update(e);
}
@Override
public void insertUpdate(DocumentEvent e) {
update(e);
}
@Override
public void removeUpdate(DocumentEvent e) {
update(e);
}
}
和
private void update(DocumentEvent e) {
String text;
try {
Document doc = e.getDocument();
text = e.getDocument().getText(0, doc.getLength());
// do something with text here! ************
System.out.println(text);
} catch (BadLocationException e1) {
e1.printStackTrace();
}
}
除此之外,我迷失在你的代码中.简化.重构.简化一些.重构一些.想想可以独立完全测试的小类.
编辑
你打电话给init() TWICE,这就是问题所在,因为这意味着你创造了两件事,一件展示,一件不展示.
你先在这里打电话:
public LifePathUI2() throws HeadlessException {
// ....
init();
}
然后在你的主要部分再次调用它:
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
LifePathUI2 ui = new LifePathUI2();
ui.init();
}
});
只打电话一次.
改变这个:
public LifePathUI2() throws HeadlessException {
cons = new GridBagConstraints();
windowLayout = new BorderLayout();
layout = new GridBagLayout();
mainWindow = new JFrame();
mainPanel = new JPanel();
mainWindow.setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
init();
}
对此:
public LifePathUI2() throws HeadlessException {
cons = new GridBagConstraints();
windowLayout = new BorderLayout();
layout = new GridBagLayout();
mainWindow = new JFrame();
mainPanel = new JPanel();
mainWindow.setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
// init();
}