我有一个基本的笔记面板，我希望缩小父级jframe调整大小时的宽度，但它没有发生。我正在使用嵌套的gridbaglayouts。
package com.protocase.notes.views;
import com.protocase.notes.controller.NotesController;
import com.protocase.notes.model.Subject;
import com.protocase.notes.model.Note;
import com.protocase.notes.model.database.PMSNotesAdapter;
import java.awt.Color;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
/**
* @author DavidH
*/
public class NotesViewer extends JPanel {
// <editor-fold defaultstate="collapsed" desc="Attributes">
private Subject subject;
private NotesController controller;
//</editor-fold>
// <editor-fold defaultstate="collapsed" desc="Getters N' Setters">
/**
* Gets back the current subject.
* @return
*/
public Subject getSubject() {
return subject;
}
public NotesController getController() {
return controller;
}
public void setController(NotesController controller) {
this.controller = controller;
}
/**
* Should clear the panel of the current subject and load the details for
* the other object.
* @param subject
*/
public void setSubject(Subject subject) {
this.subject = subject;
}
//</editor-fold>
// <editor-fold defaultstate="collapsed" desc="Constructor">
/**
* -- Sets up a note viewer with a subject and a controller. Likely this
* would be the constructor used if you were passing off from another
* NoteViewer or something else that used a notes adapter or controller.
* @param subject
* @param controller
*/
public NotesViewer(Subject subject, NotesController controller) {
this.subject = subject;
this.controller = controller;
initComponents();
}
/**
* -- Sets up a note view with a subject and creates a new controller. This
* would be the constructor typically chosen if choosing notes was
* infrequent and only one or two notes needs to be displayed.
* @param subject
*/
public NotesViewer(Subject subject) {
this(subject, new NotesController(new PMSNotesAdapter()));
}
/**
* -- Sets up a note view without a subject and creates a new controller.
* This would be for a note viewer without any notes, perhaps populating
* as you choose values in another form.
* @param subject
*/
public NotesViewer() {
this(null);
}
//</editor-fold>
// <editor-fold defaultstate="collapsed" desc="initComponents()">
/**
* Sets up the view for the NotesViewer
*/
private void initComponents() {
// -- Make a new panel for the header
JPanel panel = new JPanel();
panel.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.fill = GridBagConstraints.HORIZONTAL;
c.gridy = 0;
c.weightx = .5;
//c.anchor = GridBagConstraints.NORTHWEST;
JLabel label = new JLabel("Viewing Notes for [Subject]");
label.setAlignmentX(JLabel.LEFT_ALIGNMENT);
label.setBorder(BorderFactory.createLineBorder(Color.YELLOW));
panel.add(label);
JButton newNoteButton = new JButton("New");
c = new GridBagConstraints();
// c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 1;
c.gridy = 0;
c.weightx = .5;
c.anchor = GridBagConstraints.EAST;
panel.add(newNoteButton, c);
// -- NotePanels
c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 1;
c.weighty = 1;
c.gridx = 0;
c.gridwidth = 2;
int y = 1;
for (Note n : subject.getNotes()) {
c.gridy = y++;
panel.add(new NotesPanel(n, controller), c);
}
this.setLayout(new GridBagLayout());
GridBagConstraints pc = new GridBagConstraints();
pc.gridx = 0;
pc.gridy = 0;
pc.weightx = 1;
pc.weighty = 1;
pc.fill = GridBagConstraints.BOTH;
panel.setBackground(Color.blue);
JScrollPane scroll = new JScrollPane();
scroll.setViewportView(panel);
//scroll.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
this.add(scroll, pc);
//this.add(panel, pc);
// -- Add it all to the layout
}
//</editor-fold>
// <editor-fold defaultstate="collapsed" desc="private methods">
//</editor-fold>
}
package com.protocase.notes.views;
import com.protocase.notes.controller.NotesController;
import com.protocase.notes.model.Note;
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.border.BevelBorder;
import javax.swing.border.Border;
import javax.swing.border.MatteBorder;
/**
* @author dah01
*/
public class NotesPanel extends JPanel {
// <editor-fold defaultstate="collapsed" desc="Attributes">
private Note note;
private NotesController controller;
private CardLayout cardLayout;
private JTextArea viewTextArea;
private JTextArea editTextArea;
//</editor-fold>
// <editor-fold defaultstate="collapsed" desc="Getters N' Setters">
public NotesController getController() {
return controller;
}
public void setController(NotesController controller) {
this.controller = controller;
}
public Note getNote() {
return note;
}
public void setNote(Note note) {
this.note = note;
}
//</editor-fold>
// <editor-fold defaultstate="collapsed" desc="Constructor">
/**
* Sets up a note panel that shows everything about the note.
* @param note
*/
public NotesPanel(Note note, NotesController controller) {
this.note = note;
cardLayout = new CardLayout();
this.setLayout(cardLayout);
// -- Setup the layout manager.
this.setBackground(new Color(199, 187, 192));
this.setBorder(new BevelBorder(BevelBorder.RAISED));
// -- ViewPanel
this.add("ViewPanel", initViewPanel());
this.add("EditPanel", initEditPanel());
}
//</editor-fold>
// <editor-fold defaultstate="collapsed" desc="EditPanel">
private JPanel initEditPanel() {
JPanel editPanel = new JPanel();
editPanel.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.gridy = 0;
c.weightx = 1;
c.weighty = 0.3;
editPanel.add(initCreatorLabel(), c);
c.gridy++;
editPanel.add(initEditTextScroll(), c);
c.gridy++;
c.anchor = GridBagConstraints.WEST;
c.fill = GridBagConstraints.NONE;
editPanel.add(initEditorLabel(), c);
c.gridx++;
c.anchor = GridBagConstraints.EAST;
editPanel.add(initSaveButton(), c);
return editPanel;
}
private JScrollPane initEditTextScroll() {
this.editTextArea = new JTextArea(note.getContents());
editTextArea.setLineWrap(true);
editTextArea.setWrapStyleWord(true);
JScrollPane scrollPane = new JScrollPane(editTextArea);
scrollPane.setAlignmentX(JScrollPane.LEFT_ALIGNMENT);
Border b = scrollPane.getViewportBorder();
MatteBorder mb = BorderFactory.createMatteBorder(2, 2, 2, 2, Color.BLUE);
scrollPane.setBorder(mb);
return scrollPane;
}
private JButton initSaveButton() {
final CardLayout l = this.cardLayout;
final JPanel p = this;
final NotesController c = this.controller;
final Note n = this.note;
final JTextArea noteText = this.viewTextArea;
final JTextArea textToSubmit = this.editTextArea;
ActionListener al = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
//controller.saveNote(n);
noteText.setText(textToSubmit.getText());
l.next(p);
}
};
JButton saveButton = new JButton("Save");
saveButton.addActionListener(al);
saveButton.setPreferredSize(new Dimension(62, 26));
return saveButton;
}
//</editor-fold>
// <editor-fold defaultstate="collapsed" desc="ViewPanel">
private JPanel initViewPanel() {
JPanel viewPanel = new JPanel();
viewPanel.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL ;
c.gridy = 0;
c.weightx = 1;
c.weighty = 0.3;
viewPanel.add(initCreatorLabel(), c);
c.gridy++;
viewPanel.add(this.initNoteTextArea(), c);
c.fill = GridBagConstraints.NONE;
c.anchor = GridBagConstraints.WEST;
c.gridy++;
viewPanel.add(initEditorLabel(), c);
c.gridx++;
c.anchor = GridBagConstraints.EAST;
viewPanel.add(initEditButton(), c);
return viewPanel;
}
private JLabel initCreatorLabel() {
DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
if (note != null) {
String noteBy = "Note by " + note.getCreator();
String noteCreated = formatter.format(note.getDateCreated());
JLabel creatorLabel = new JLabel(noteBy + " @ " + noteCreated);
creatorLabel.setAlignmentX(JLabel.LEFT_ALIGNMENT);
return creatorLabel;
} else {
System.out.println("NOTE IS NULL");
return null;
}
}
private JScrollPane initNoteTextArea() {
// -- Setup the notes area.
this.viewTextArea = new JTextArea(note.getContents());
viewTextArea.setEditable(false);
viewTextArea.setLineWrap(true);
viewTextArea.setWrapStyleWord(true);
JScrollPane scrollPane = new JScrollPane(viewTextArea);
scrollPane.setAlignmentX(JScrollPane.LEFT_ALIGNMENT);
return scrollPane;
}
private JLabel initEditorLabel() {
// -- Setup the edited by label.
JLabel editorLabel = new JLabel(" -- Last edited by " + note.getLastEdited() + " at " + note.getDateModified());
editorLabel.setAlignmentX(Component.LEFT_ALIGNMENT);
return editorLabel;
}
private JButton initEditButton() {
final CardLayout l = this.cardLayout;
final JPanel p = this;
ActionListener ar = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
l.next(p);
}
};
JButton editButton = new JButton("Edit");
editButton.setPreferredSize(new Dimension(62,26));
editButton.addActionListener(ar);
return editButton;
}
//</editor-fold>
// <editor-fold defaultstate="collapsed" desc="Grow Width When Resized">
@Override
public Dimension getPreferredSize() {
int fw = this.getParent().getSize().width;
int fh = super.getPreferredSize().height;
return new Dimension(fw,fh);
}
//</editor-fold>
}
答案 0 :(得分：1)
对于手动控制，将组件侦听器添加到父组件，如下所示：
MyParentComponent.addComponentListener(new java.awt.event.ComponentAdapter() {
public void componentResized(java.awt.event.ComponentEvent evt) {
ComponentResized(evt);
}
});
创建“ComponentResized”方法并将大小更改为您需要的任何内容，如下所示：
private void ComponentResized(ComponentEvent evt)
{
MyChildComponent.setSize(newWidth, newHeight);
}