我的最新项目目前遇到问题。我是初学者,所以请记住这一点:D
我希望我的项目做的是在选中复选框时更改某些文本的字体,如果取消选中,则使其恢复正常。
我已经设法实现了它。
但是,有多行复选框。如果选择了 2 个并且我取消选择其中一个,则文本将恢复正常。只要列中的复选框仍处于选中状态,我就不希望文本变得正常。
我该怎么做? =(
希望你们中的一个人能帮助我!
import java.awt.Color;
public class WindowBuilderTest extends JFrame
{
private JPanel contentPane;
//Launch the application.
public static void main(final String[] args)
{
EventQueue.invokeLater(new Runnable()
{
@Override
public void run()
{
try
{
final WindowBuilderTest frame = new WindowBuilderTest();
frame.setVisible(true);
}
catch (final Exception e)
{
e.printStackTrace();
}
}
});
}
// Creating Frame
public WindowBuilderTest()
{
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 1280, 720);
this.contentPane = new JPanel();
this.contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(this.contentPane);
this.contentPane.setLayout(null);
// Create Font
final Font headfont = new Font("Serif", Font.PLAIN, 15);
final Font headfontRed = new Font("Serif", Font.PLAIN, 15);
// Role Headlines
final JTextArea txtTop = new JTextArea();
txtTop.setEditable(false);
txtTop.setText("TOP");
txtTop.setBounds(180, 95, 32, 23);
this.contentPane.add(txtTop);
final JTextArea txtMid = new JTextArea();
txtMid.setEditable(false);
txtMid.setText("MID");
txtMid.setBounds(252, 95, 32, 23);
this.contentPane.add(txtMid);
final JTextArea txtJng = new JTextArea();
txtJng.setEditable(false);
txtJng.setText("JNG");
txtJng.setBounds(320, 95, 32, 23);
this.contentPane.add(txtJng);
final JTextArea txtAdc = new JTextArea();
txtAdc.setEditable(false);
txtAdc.setText("ADC");
txtAdc.setBounds(389, 95, 32, 23);
this.contentPane.add(txtAdc);
final JTextArea txtSup = new JTextArea();
txtSup.setEditable(false);
txtSup.setText("SUP");
txtSup.setBounds(453, 95, 32, 23);
this.contentPane.add(txtSup);
// Checkbox 1st row
addCheckBox(183, 143, 23, 23, txtTop);
addCheckBox(255, 143, 23, 23, txtMid);
addCheckBox(322, 143, 23, 23, txtJng);
addCheckBox(393, 143, 23, 23, txtAdc);
addCheckBox(457, 143, 23, 23, txtSup);
// Checkbox 2nd row
addCheckBox(183, 200, 23, 23, txtTop);
addCheckBox(255, 200, 23, 23, txtMid);
addCheckBox(322, 200, 23, 23, txtJng);
addCheckBox(393, 200, 23, 23, txtAdc);
addCheckBox(457, 200, 23, 23, txtSup);
// Checkbox 3nd row
addCheckBox(183, 257, 23, 23, txtTop);
addCheckBox(255, 257, 23, 23, txtMid);
addCheckBox(322, 257, 23, 23, txtJng);
addCheckBox(393, 257, 23, 23, txtAdc);
addCheckBox(457, 257, 23, 23, txtSup);
}
private void addCheckBox(final int x, final int y, final int width, final int height, final JTextArea txtTop)
{
final JCheckBox checkBox = new JCheckBox();
checkBox.setBounds(x, y, width, height);
checkBox.addItemListener(new FontChanger(txtTop));
this.contentPane.add(checkBox);
}
class FontChanger implements ItemListener
{
private JTextArea textArea;
public FontChanger(final JTextArea textArea)
{
this.textArea = textArea;
}
@Override
public void itemStateChanged(final ItemEvent e)
{
if (e.getStateChange() == ItemEvent.SELECTED)
{
final Font boldFont = this.textArea.getFont().deriveFont(Font.BOLD);
this.textArea.setForeground(Color.RED);
this.textArea.setFont(boldFont);
}
else
{
final Font boldFont = this.textArea.getFont().deriveFont(Font.PLAIN);
this.textArea.setForeground(Color.BLACK);
this.textArea.setFont(boldFont);
}
}
}
}
有几种方法可以实现您想尝试做的事情,但我相信这个问题更概念化。您添加到面板的每个复选框都有其*自己的*字体转换器。这些字体转换器中的每一个都不知道其他字体转换器或复选框。相反,您可以做的是将单个字体转换器添加到所有复选框中,然后有一种方法让您的单个字体转换器知道itemStateChanged((方法中每个复选框的状态。这样,您可以检查是否/选中了多少/哪个复选框并对其执行操作。
编辑:这是一个完整的示例(注意我已经广泛修改了您的代码并且尚未对其进行测试,这只是为了给您一个大致的想法。此外,为了提高代码可读性,我删除了大部分最终关键字,此外,如果您没有特定的理由使用不同的线程来运行程序,则无需在新的 Runnable(( 中运行 WindowBuilderTest,请参阅注释部分(。
import java.awt.Color;
import java.util.*;
public class WindowBuilderTest extends JFrame
{
private JPanel contentPane;
private FontChanger fChanger; //<--NEW
private JTextArea txtTop; //<--NEW
private List<CheckBox> checkBoxes; //<--NEW
//Launch the application.
public static void main(final String[] args)
{
EventQueue.invokeLater(new Runnable()
{
@Override
public void run()
{
try
{
WindowBuilderTest frame = new WindowBuilderTest();
frame.setVisible(true);
}
catch (final Exception e)
{
e.printStackTrace();
}
}
});
//just use this and comment out the whole Eventqueue block.
/*
WindowBuilderTest frame = new WindowBuilderTest();
frame.setVisible(true);
*/
}
// Creating Frame
public WindowBuilderTest()
{
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 1280, 720);
this.contentPane = new JPanel();
this.contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(this.contentPane);
this.contentPane.setLayout(null);
// Create Font
Font headfont = new Font("Serif", Font.PLAIN, 15);
Font headfontRed = new Font("Serif", Font.PLAIN, 15);
// Role Headlines
txtTop = new JTextArea(); //<--NEW
fChanger = new FontChanger(txtTop); //<--NEW
checkBoxes = new ArrayList<CheckBox>(); //<-- NEW you will need to update your imports.
txtTop.setEditable(false);
txtTop.setText("TOP");
txtTop.setBounds(180, 95, 32, 23);
this.contentPane.add(txtTop);
final JTextArea txtMid = new JTextArea();
txtMid.setEditable(false);
txtMid.setText("MID");
txtMid.setBounds(252, 95, 32, 23);
this.contentPane.add(txtMid);
final JTextArea txtJng = new JTextArea();
txtJng.setEditable(false);
txtJng.setText("JNG");
txtJng.setBounds(320, 95, 32, 23);
this.contentPane.add(txtJng);
final JTextArea txtAdc = new JTextArea();
txtAdc.setEditable(false);
txtAdc.setText("ADC");
txtAdc.setBounds(389, 95, 32, 23);
this.contentPane.add(txtAdc);
final JTextArea txtSup = new JTextArea();
txtSup.setEditable(false);
txtSup.setText("SUP");
txtSup.setBounds(453, 95, 32, 23);
this.contentPane.add(txtSup);
// Checkbox 1st row
addCheckBox(183, 143, 23, 23, txtTop);
addCheckBox(255, 143, 23, 23, txtMid);
addCheckBox(322, 143, 23, 23, txtJng);
addCheckBox(393, 143, 23, 23, txtAdc);
addCheckBox(457, 143, 23, 23, txtSup);
// Checkbox 2nd row
addCheckBox(183, 200, 23, 23, txtTop);
addCheckBox(255, 200, 23, 23, txtMid);
addCheckBox(322, 200, 23, 23, txtJng);
addCheckBox(393, 200, 23, 23, txtAdc);
addCheckBox(457, 200, 23, 23, txtSup);
// Checkbox 3nd row
addCheckBox(183, 257, 23, 23, txtTop);
addCheckBox(255, 257, 23, 23, txtMid);
addCheckBox(322, 257, 23, 23, txtJng);
addCheckBox(393, 257, 23, 23, txtAdc);
addCheckBox(457, 257, 23, 23, txtSup);
}
private void addCheckBox(int x, int y, int width, int height)
{
JCheckBox checkBox = new JCheckBox();
checkBoxes.add(checkBox); // <-- NEW (add to checkboxes list)
checkBox.setBounds(x, y, width, height);
checkBox.addItemListener(fChanger); // <-- NEW (add the same listener to all)
this.contentPane.add(checkBox);
}
class FontChanger implements ItemListener
{
private JTextArea textArea;
public FontChanger(JTextArea textArea)
{
this.textArea = textArea;
}
@Override
public void itemStateChanged(ItemEvent e)
{
if (e.getStateChange() == ItemEvent.SELECTED)
{
Font boldFont = this.textArea.getFont().deriveFont(Font.BOLD);
this.textArea.setForeground(Color.RED);
this.textArea.setFont(boldFont);
}
else
{
//iterate through list of checkboxes to see if there's still one selected.
boolean stillOneCheckBoxSelected = false;
for(int i = 0; i < checkBoxes.size(); i++){
if(checkBoxes.get(i).isSelected()){ // <- Verify the method here, not sure
stillOneCheckBoxSelected = true;
break;
}
}
if(!stillOneCheckBoxSelected){//if no check boxes are selected, reset
Font boldFont = this.textArea.getFont().deriveFont(Font.PLAIN);
this.textArea.setForeground(Color.BLACK);
this.textArea.setFont(boldFont);
}
}
}
}
同样,我还没有测试过这个,你可能需要修补一些东西,但我认为你可以从这里继续。以下是 JavaDoc for ArrayLists 的链接,您可能需要查阅:ArrayList JavaDoc
第二次编辑:我重新阅读了您的问题,您实际上希望此逻辑仅适用于一组特定的列,因此您必须更改逻辑以仅将相关复选框添加到列表中,以便每次执行检查时,仅选中相关的复选框。