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MainPanel.java
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/
MainPanel.java
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// -*- mode:java; encoding:utf-8 -*-
// vim:set fileencoding=utf-8:
// @homepage@
package example;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.util.Objects;
import java.util.Optional;
import javax.swing.*;
import javax.swing.plaf.basic.BasicSplitPaneUI;
public final class MainPanel extends JPanel {
private MainPanel() {
super(new BorderLayout());
JScrollPane s1 = new JScrollPane(new JTable(5, 3)) {
@Override public Dimension getMinimumSize() {
return new Dimension(0, 100);
}
};
JScrollPane s2 = new JScrollPane(new JTree()) {
@Override public Dimension getMinimumSize() {
return new Dimension(0, 100);
}
};
JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
splitPane.setTopComponent(s1);
splitPane.setBottomComponent(s2);
splitPane.setOneTouchExpandable(true);
JPanel north = new JPanel(new GridLayout(0, 2, 5, 5));
north.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
north.add(new JButton(new AbstractAction("Min:DividerLocation") {
@Override public void actionPerformed(ActionEvent e) {
splitPane.setDividerLocation(0);
}
}));
north.add(new JButton(new AbstractAction("Max:DividerLocation") {
@Override public void actionPerformed(ActionEvent e) {
Optional<Insets> ins = Optional.ofNullable(splitPane.getInsets());
int loc;
if (splitPane.getOrientation() == JSplitPane.VERTICAL_SPLIT) {
loc = splitPane.getHeight() - ins.map(i -> i.bottom).orElse(0);
} else {
loc = splitPane.getWidth() - ins.map(i -> i.right).orElse(0);
}
splitPane.setDividerLocation(loc);
// int lastLoc = splitPane.getLastDividerLocation();
// int currentLoc = splitPane.getDividerLocation();
// int newLoc;
// BasicSplitPaneUI splitPaneUI = (BasicSplitPaneUI) splitPane.getUI();
// Container divider = ((BasicSplitPaneUI) splitPane.getUI()).getDivider();
//
// if (currentLoc == insets.top) {
// int maxLoc = splitPane.getMaximumDividerLocation();
// newLoc = Math.min(lastLoc, maxLoc);
// // splitPaneUI.setKeepHidden(false);
// } else {
// newLoc = splitPane.getHeight() - divider.getHeight() - insets.top;
// // splitPaneUI.setKeepHidden(true);
// }
// if (currentLoc != newLoc) {
// splitPane.setDividerLocation(newLoc);
// splitPane.setLastDividerLocation(currentLoc);
// }
}
}));
Action minAction = new AbstractAction("selectMin") {
@Override public void actionPerformed(ActionEvent e) {
splitPane.requestFocusInWindow();
EventQueue.invokeLater(() -> {
String cmd = e.getActionCommand();
ActionMap am = splitPane.getActionMap();
am.get(cmd).actionPerformed(new ActionEvent(splitPane, e.getID(), cmd));
});
}
};
north.add(new JButton(minAction));
Action maxAction = new AbstractAction("selectMax") {
@Override public void actionPerformed(ActionEvent e) {
splitPane.requestFocusInWindow();
EventQueue.invokeLater(() -> {
String cmd = e.getActionCommand();
ActionMap am = splitPane.getActionMap();
am.get(cmd).actionPerformed(new ActionEvent(splitPane, e.getID(), cmd));
});
}
};
north.add(new JButton(maxAction));
JButton minButton = new JButton("Min:keepHidden");
JButton maxButton = new JButton("Max:keepHidden");
Container divider = ((BasicSplitPaneUI) splitPane.getUI()).getDivider();
initDividerButtonModel(divider, minButton, maxButton);
north.add(minButton);
north.add(maxButton);
add(north, BorderLayout.NORTH);
add(splitPane);
setPreferredSize(new Dimension(320, 240));
}
private static void initDividerButtonModel(Container divider, JButton minBtn, JButton maxBtn) {
ButtonModel selectMinModel = null;
ButtonModel selectMaxModel = null;
for (Component c : divider.getComponents()) {
if (c instanceof JButton) {
ButtonModel m = ((JButton) c).getModel();
if (Objects.isNull(selectMinModel)) {
selectMinModel = m;
} else if (Objects.isNull(selectMaxModel)) {
selectMaxModel = m;
}
}
}
minBtn.setModel(selectMinModel);
maxBtn.setModel(selectMaxModel);
}
public static void main(String[] args) {
EventQueue.invokeLater(MainPanel::createAndShowGui);
}
private static void createAndShowGui() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (UnsupportedLookAndFeelException ignored) {
Toolkit.getDefaultToolkit().beep();
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException ex) {
ex.printStackTrace();
return;
}
JFrame frame = new JFrame("@title@");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.getContentPane().add(new MainPanel());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}