我有一个JDialog，在borderlayout中设置了其他组件。 ComponentListeners被添加到JTextAreas中，以便JDialog在文本区域增长时增大。
我增加或减少组件的字体大小，两个按钮增加字体大小并减小字体大小。
每当我更改字体大小时，我都会调用pack（）来打包组件。在字体增加一切正常。所有组件都布置得很好。但是，当我将字体大小减小到可能的最低值时，宽度保持不变，只有高度发生变化。我希望高度和宽度都能改变。我怀疑我对布局做错了什么。
我只设置了Jdialog的minimumSize。
public class MyDialog implements ActionListener{
private int itsFontSize = 15;
JPanel itsTitlePanel;
JPanel itsMainPanel;
JPanel itsInnerPanel;
JPanel itsButtonPanel;
JDialog myDialog;
public static void main(String[] args) {
JFrame dialogOwner = new JFrame();
MyDialog myyDialogInstance = new MyDialog();
myyDialogInstance.createDialog(dialogOwner);
dialogOwner.setVisible(true);
// TODO Auto-generated method stub
}
public JDialog createDialog(JFrame dialogOwner)
{
myDialog = new JDialog();
myDialog.setAlwaysOnTop(true);
myDialog.setModal(true);
myDialog.setUndecorated(true);
myDialog.setResizable(false);
myDialog.setOpacity(0.9F);
myDialog.setMinimumSize(new Dimension(300, 200));
myDialog.setLayout(new BorderLayout());
// title panel
JLabel titleLabel = new JLabel("My Title");
titleLabel.setFont(new Font("Arial", Font.BOLD, itsFontSize));
itsTitlePanel = new JPanel();
itsTitlePanel.setLayout(new BorderLayout());
itsTitlePanel.setOpaque(true);
itsTitlePanel.add(titleLabel, BorderLayout.CENTER);
myDialog.add(itsTitlePanel, BorderLayout.NORTH);
createMainPanel();
myDialog.add(itsMainPanel, BorderLayout.CENTER);
createButtonPanel();
myDialog.add(itsButtonPanel, BorderLayout.SOUTH);
myDialog.setVisible(true);
dialogOwner.add(myDialog);
return myDialog;
}
public void createMainPanel()
{
createInnerPanel();
itsMainPanel = new JPanel();
itsMainPanel.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.weightx = 1.0;
c.weighty = 1.0;
c.gridwidth = 1;
c.gridheight =1;
c.gridx = 0;
c.gridy = 0;
c.fill = GridBagConstraints.BOTH;
itsMainPanel.add(itsInnerPanel,c);
for(int i =1 ; i<3;i++)
{
JTextArea textArea = new JTextArea();
textArea.setOpaque(true);
textArea.setBackground(Color.gray);
textArea.addComponentListener(new ComponentListener() {
@Override
public void componentShown(ComponentEvent e) {
// TODO Auto-generated method stub
}
@Override
public void componentResized(ComponentEvent e) {
myDialog.revalidate();
myDialog.pack();
}
@Override
public void componentMoved(ComponentEvent e) {
// TODO Auto-generated method stub
}
@Override
public void componentHidden(ComponentEvent e) {
// TODO Auto-generated method stub
}
});
textArea.setWrapStyleWord(true);
textArea.setFont(new Font("Arial", Font.PLAIN, itsFontSize));
textArea.setLineWrap(true);
textArea.setText("Blue mooonnnnn dayyyy apart frommm chalengeee boww bowww coww owww dogggyyy");
c.gridy = i;
c.insets = new Insets(5, 10, 5, 10);
itsMainPanel.add(textArea, c);
}
}
public void createInnerPanel()
{
itsInnerPanel = new JPanel();
itsInnerPanel.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.weightx = 1.0;
c.weighty = 1.0;
c.gridwidth = 1;
c.gridheight =1;
c.gridy = 0;
c.fill = GridBagConstraints.BOTH;
c.insets = new Insets(5, 10, 5, 10);
for(int i = 0; i<3; i++)
{
JButton button = new JButton();
button.setText("Inner " + (i+1));
button.setOpaque(true);
button.setFont(new Font("Arial", Font.PLAIN, itsFontSize));
c.gridx = i;
itsInnerPanel.add(button, c);
}
}
public void createButtonPanel()
{
itsButtonPanel = new JPanel();
itsButtonPanel.setLayout(new FlowLayout(FlowLayout.LEADING, 5, 5));
for(int i = 0 ; i <3 ; i ++)
{
JButton button = new JButton();
if(i==0)
{
button.setText("Increase font size");
}
else if(i==1)
{
button.setText("Decrease font size");
}
else
{
button.setText("Close Dialog");
}
button.setOpaque(true);
button.setFont(new Font("Arial", Font.PLAIN, itsFontSize));
button.addActionListener(this);
button.setActionCommand("Button " + (i+1));
itsButtonPanel.add(button);
}
}
@Override
public void actionPerformed(ActionEvent actionEvent) {
// TODO Auto-generated method stub
if(actionEvent.getActionCommand().equals("Button 1"))
{
if(itsFontSize <= 48)
{
itsFontSize +=2;
setComponentsWithLatestFontSize();
}
}
else if(actionEvent.getActionCommand().equals("Button 2"))
{
if(itsFontSize >= 17)
{
itsFontSize -= 2;
setComponentsWithLatestFontSize();
}
}
else
{
myDialog.dispose();;
}
}
public void setComponentsWithLatestFontSize()
{
if(itsTitlePanel != null)
{
for(Component comp : itsTitlePanel.getComponents())
{
Font oldFont = comp.getFont();
if(oldFont != null)
{
comp.setFont(new Font(oldFont.getName(), oldFont.getStyle(), itsFontSize));
}
}
}
if(itsMainPanel != null)
{
for(Component comp : itsMainPanel.getComponents())
{
Font oldFont = comp.getFont();
if(oldFont != null)
{
comp.setFont(new Font(oldFont.getName(), oldFont.getStyle(), itsFontSize));
}
}
}
if(itsButtonPanel != null)
{
for(Component comp : itsButtonPanel.getComponents())
{
Font oldFont = comp.getFont();
if(oldFont != null)
{
comp.setFont(new Font(oldFont.getName(), oldFont.getStyle(), itsFontSize));
}
}
}
if(itsInnerPanel != null)
{
for(Component comp : itsInnerPanel.getComponents())
{
Font oldFont = comp.getFont();
if(oldFont != null)
{
comp.setFont(new Font(oldFont.getName(), oldFont.getStyle(), itsFontSize));
}
}
}
myDialog.revalidate();
}