Question

对于我的申请，我有一个JDialog，其中包含JPanel个基本JTextFields和JButtons。我们的想法是有一个按钮，可以展开JDialog以显示第二个JPanel，其中包含一些“高级”设置。

我通过调用setPreferredSize()和pack()来实现这一目标，但这不是很优雅。一个“优雅”的解决方案是将第二个Panel设置为某种方式为null，因此当切换状态为“缩回”时，pack（）会忽略它。

很抱歉，我无法为您提供代码（那个东西大约有700个谎言），但就像我在JDialog中基本上说两个JPanels一样。

这里有一些照片：

enter image description here

问题：如果不必为扩展/正常状态设置固定尺寸，是否有一个技巧可以使这个扩展的事情发生。

Answer 1

可能有几种方法可以做到这一点，例如，您可以根据需要添加和删除底部面板。如果可以，我想避免这种情况，因为它可以使管理布局更加困难。

另一个解决方案只是让组件可见/不可见，但你需要找到一个布局管理器，它实际上会处理一个不可见的组件，就像它不在那里一样（0x0） - 是的，我遇到了一个问题把测试放在一起的夫妇......

Flip

import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class FlipDialog {

    public static void main(String[] args) {
        new FlipDialog();
    }

    public FlipDialog() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        private JButton flip;
        private JPanel bottom;

        public TestPane() {
            setLayout(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.insets = new Insets(8, 8, 8, 8);
            gbc.gridwidth = GridBagConstraints.REMAINDER;
            JPanel top = new JPanel();
            flip = new JButton("+");
            top.add(flip);
            add(top, gbc);

            bottom = new JPanel();
            bottom.add(new JLabel("Boo"));
            bottom.setVisible(false);

            add(bottom, gbc);

            flip.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    bottom.setVisible(!bottom.isVisible());
                    if (bottom.isVisible()) {
                        flip.setText("-");
                    } else {
                        flip.setText("+");
                    }
                    revalidate();
                    Window window = SwingUtilities.windowForComponent(bottom);
                    window.pack();
                }
            });
        }

    }

}

应该注意的是，对revalidate的调用可能无关紧要，因为你正在打包窗口

更新了布局示例

Closed Opended

import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.AbstractSpinnerModel;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSpinner;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.EmptyBorder;
import javax.swing.border.TitledBorder;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class Test100 {

    public static void main(String[] args) {
        new Test100();
    }

    public Test100() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new SearchPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class SearchPane extends JPanel {

        private ObjectsPane objectsPane;
        private AdvanceSettingsPane advanceSettingsPane;

        public SearchPane() {
            setBorder(new EmptyBorder(8, 8, 8, 8));
            setLayout(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridx = 0;
            gbc.gridy = 0;
            gbc.weightx = 1;
            gbc.weighty = 1;
            gbc.fill = GridBagConstraints.BOTH;

            objectsPane = new ObjectsPane();
            add(objectsPane, gbc);

            gbc.gridy++;
            gbc.weighty = 0;

            advanceSettingsPane = new AdvanceSettingsPane();
            advanceSettingsPane.setVisible(false);
            add(advanceSettingsPane, gbc);

            objectsPane.addExpandCollapseListener(new ChangeListener() {

                @Override
                public void stateChanged(ChangeEvent e) {
                    System.out.println(objectsPane.isExpanded());
                    advanceSettingsPane.setVisible(objectsPane.isExpanded());
                    Window window = SwingUtilities.windowForComponent(SearchPane.this);
                    window.pack();
                }
            });
        }

        public class ObjectsPane extends JPanel {

            private JSpinner findField;
            private JTextField replaceField;

            private JButton expandButton;
            private JButton replaceButton;
            private JButton replaceAllButton;

            private boolean expanded = false;

            public ObjectsPane() {
                setLayout(new GridBagLayout());

                findField = new JSpinner(new AbstractSpinnerModel() {

                    @Override
                    public Object getValue() {
                        return "";
                    }

                    @Override
                    public void setValue(Object value) {
                    }

                    @Override
                    public Object getNextValue() {
                        return "";
                    }

                    @Override
                    public Object getPreviousValue() {
                        return "";
                    }
                });
                replaceField = new JTextField(10);

                replaceButton = new JButton("Replace");
                replaceAllButton = new JButton("Replace All");
                expandButton = new JButton("+");

                GridBagConstraints gbc = new GridBagConstraints();
                gbc.insets = new Insets(4, 4, 4, 4);
                gbc.gridx = 0;
                gbc.gridy = 0;
                gbc.gridwidth = GridBagConstraints.REMAINDER;
                gbc.weightx = 1;
                gbc.anchor = GridBagConstraints.WEST;
                add(new JLabel("Objects found:"), gbc);

                gbc.gridx = 0;
                gbc.gridy = 1;
                gbc.gridwidth = 1;
                gbc.weightx = 0;
                add(new JLabel("Find:"), gbc);

                gbc.gridy = 2;
                add(new JLabel("Replace:"), gbc);

                gbc.gridx = 1;
                gbc.gridy = 1;
                gbc.weightx = 1;
                gbc.fill = GridBagConstraints.HORIZONTAL;
                gbc.gridwidth = GridBagConstraints.REMAINDER;
                add(findField, gbc);

                gbc.gridy = 2;
                add(replaceField, gbc);

                gbc.anchor = GridBagConstraints.WEST;
                gbc.gridwidth = 1;
                gbc.weightx = 0;
                gbc.gridx = 0;
                gbc.gridy = 3;
                gbc.fill = GridBagConstraints.NONE;
                add(expandButton, gbc);

                JPanel pnlButtons = new JPanel(new GridLayout(1, 2));
                pnlButtons.add(replaceButton);
                pnlButtons.add(replaceAllButton);

                gbc.gridx = 1;
                gbc.gridy = 3;
                gbc.fill = GridBagConstraints.HORIZONTAL;
                gbc.weightx = 1;
                gbc.gridwidth = GridBagConstraints.REMAINDER;
                add(pnlButtons, gbc);

                expandButton.addActionListener(new ActionListener() {
                    @Override
                    public void actionPerformed(ActionEvent e) {
                        expanded = !expanded;
                        if (expanded) {
                            expandButton.setText("-");
                        } else {
                            expandButton.setText("+");
                        }
                        fireStateChanged();
                    }
                });
            }

            public boolean isExpanded() {
                return expanded;
            }

            public void addExpandCollapseListener(ChangeListener listener) {
                listenerList.add(ChangeListener.class, listener);
            }

            public void removeExpandCollapseListener(ChangeListener listener) {
                listenerList.remove(ChangeListener.class, listener);
            }

            protected void fireStateChanged() {
                ChangeListener[] listeners = listenerList.getListeners(ChangeListener.class);
                if (listeners.length > 0) {

                    ChangeEvent evt = new ChangeEvent(this);
                    for (ChangeListener listener : listeners) {
                        listener.stateChanged(evt);
                    }

                }
            }

        }

        public class AdvanceSettingsPane extends JPanel {

            public AdvanceSettingsPane() {
                setBorder(new TitledBorder("Advance Settings"));
                setLayout(new GridBagLayout());
                GridBagConstraints gbc = new GridBagConstraints();
                gbc.gridx = 0;
//              gbc.gridy = 0;
                gbc.weightx = 1;
                gbc.anchor = GridBagConstraints.WEST;
                gbc.gridwidth = GridBagConstraints.REMAINDER;

                add(new JCheckBox("Live Update"), gbc);
                add(new JCheckBox("Word search"), gbc);
                add(new JCheckBox("Ignore Case"), gbc);
            }

        }

    }

}

java可扩展的JDialog

1 个答案: