/
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 com.sun.java.swing.plaf.windows.WindowsTableHeaderUI;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.font.TextLayout;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.util.Optional;
import javax.swing.*;
import javax.swing.event.MouseInputListener;
import javax.swing.plaf.TableHeaderUI;
import javax.swing.plaf.basic.BasicSplitPaneDivider;
import javax.swing.plaf.basic.BasicSplitPaneUI;
import javax.swing.plaf.basic.BasicTableHeaderUI;
import javax.swing.plaf.synth.SynthTableHeaderUI;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableColumn;
public final class MainPanel extends JPanel {
private MainPanel() {
super(new GridLayout(0, 1));
JSplitPane sp = makeSplitPane(false);
BasicSplitPaneDivider divider = ((BasicSplitPaneUI) sp.getUI()).getDivider();
divider.setCursor(Cursor.getPredefinedCursor(Cursor.W_RESIZE_CURSOR)); // Ubuntu
add(makeSplitPane(false));
add(sp);
add(makeSplitPane(true));
setPreferredSize(new Dimension(320, 240));
}
private static JSplitPane makeSplitPane(boolean flag) {
JSplitPane sp;
if (flag) {
sp = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT) {
@Override public void updateUI() {
super.updateUI();
EventQueue.invokeLater(() -> {
Component c = ((BasicSplitPaneUI) getUI()).getDivider();
c.setCursor(ResizeUtils.createCursor("⇹", 32, 32, c));
});
}
};
} else {
sp = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
}
sp.setContinuousLayout(true);
sp.setTopComponent(new JScrollPane(new JTree()));
sp.setBottomComponent(new JScrollPane(flag ? makeTable() : new JTable(2, 3)));
EventQueue.invokeLater(() -> sp.setDividerLocation(.3));
return sp;
}
private static JTable makeTable() {
return new JTable(2, 3) {
@Override protected JTableHeader createDefaultTableHeader() {
return new JTableHeader(columnModel) {
@Override public void updateUI() {
super.updateUI();
TableHeaderUI ui = getUI();
if (ui instanceof WindowsTableHeaderUI) {
setUI(new MyWindowsTableHeaderUI());
} else if (ui instanceof SynthTableHeaderUI) {
setUI(new MySynthTableHeaderUI());
} else {
setUI(new MyBasicTableHeaderUI());
}
}
};
}
};
}
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);
}
}
final class ResizeUtils {
private ResizeUtils() {
/* HideUtilityClassConstructor */
}
public static Cursor createCursor(String s, int width, int height, Component c) {
float size = height - 2f;
BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = bi.createGraphics();
g2.setFont(c.getFont().deriveFont(size));
Shape shape = new TextLayout(s, g2.getFont(), g2.getFontRenderContext()).getOutline(null);
Icon icon = new ShapeIcon(shape, width, height);
icon.paintIcon(c, g2, 0, 0);
g2.dispose();
Point hotSpot = new Point(width / 2, height / 2);
return c.getToolkit().createCustomCursor(bi, hotSpot, s);
}
public static boolean canResize(TableColumn column, JTableHeader header) {
return column != null && header.getResizingAllowed() && column.getResizable();
}
public static TableColumn getResizeColumn(JTableHeader header, Point p) {
return Optional.ofNullable(header)
.map(h -> {
int column = h.columnAtPoint(p);
return column == -1 ? null : getRect(h, p, column);
})
.map(r -> {
int column = header.columnAtPoint(p);
int midPoint = r.x + r.width / 2;
int colIdx;
if (header.getComponentOrientation().isLeftToRight()) {
colIdx = p.x < midPoint ? column - 1 : column;
} else {
colIdx = p.x < midPoint ? column : column - 1;
}
return colIdx == -1 ? null : header.getColumnModel().getColumn(colIdx);
})
.orElse(null);
}
private static Rectangle getRect(JTableHeader header, Point p, int column) {
Rectangle r = header.getHeaderRect(column);
r.grow(-3, 0);
return r.contains(p) ? null : r;
}
}
class MyWindowsTableHeaderUI extends WindowsTableHeaderUI {
@Override protected MouseInputListener createMouseInputListener() {
return new MouseInputHandler() {
private final Cursor resizeCursor = ResizeUtils.createCursor("⇼", 32, 32, header);
private final Cursor defaultCursor = Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR);
@Override public void mouseMoved(MouseEvent e) {
super.mouseMoved(e);
if (!header.isEnabled()) {
return;
}
if (ResizeUtils.canResize(ResizeUtils.getResizeColumn(header, e.getPoint()), header)) {
header.setCursor(resizeCursor);
} else {
header.setCursor(defaultCursor);
}
}
};
}
}
class MySynthTableHeaderUI extends SynthTableHeaderUI {
@Override protected MouseInputListener createMouseInputListener() {
return new MouseInputHandler() {
private final Cursor resizeCursor = ResizeUtils.createCursor("⇼", 32, 32, header);
private final Cursor defaultCursor = Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR);
@Override public void mouseMoved(MouseEvent e) {
super.mouseMoved(e);
if (!header.isEnabled()) {
return;
}
if (ResizeUtils.canResize(ResizeUtils.getResizeColumn(header, e.getPoint()), header)) {
header.setCursor(resizeCursor);
} else {
header.setCursor(defaultCursor);
}
}
};
}
}
class MyBasicTableHeaderUI extends BasicTableHeaderUI {
@Override protected MouseInputListener createMouseInputListener() {
return new MouseInputHandler() {
private final Cursor resizeCursor = ResizeUtils.createCursor("⇼", 32, 32, header);
private final Cursor defaultCursor = Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR);
@Override public void mouseMoved(MouseEvent e) {
super.mouseMoved(e);
if (!header.isEnabled()) {
return;
}
if (ResizeUtils.canResize(ResizeUtils.getResizeColumn(header, e.getPoint()), header)) {
header.setCursor(resizeCursor);
} else {
header.setCursor(defaultCursor);
}
}
};
}
}
class ShapeIcon implements Icon {
private final Shape shape;
private final int width;
private final int height;
protected ShapeIcon(Shape shape, int width, int height) {
this.shape = shape;
this.width = width;
this.height = height;
}
@Override public void paintIcon(Component c, Graphics g, int x, int y) {
Graphics2D g2 = (Graphics2D) g.create();
// g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.translate(x, y);
Rectangle2D b = shape.getBounds2D();
double tx = width / 2d - b.getCenterX();
double ty = height / 2d - b.getCenterY();
AffineTransform toCenterAt = AffineTransform.getTranslateInstance(tx, ty);
g2.setPaint(c.getForeground());
g2.fill(toCenterAt.createTransformedShape(shape));
g2.dispose();
}
@Override public int getIconWidth() {
return width;
}
@Override public int getIconHeight() {
return height;
}
}