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package com.dua3.utility.swing;
import com.dua3.cabe.annotations.Nullable;
import com.dua3.utility.awt.AwtFontUtil;
import com.dua3.utility.data.Color;
import com.dua3.utility.logging.LogBuffer;
import com.dua3.utility.logging.LogEntry;
import com.dua3.utility.logging.LogLevel;
import com.dua3.utility.logging.LogUtil;
import com.dua3.utility.math.MathUtil;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.JSeparator;
import javax.swing.JSplitPane;
import javax.swing.JTable;
import javax.swing.JTextArea;
import javax.swing.JToolBar;
import javax.swing.KeyStroke;
import javax.swing.ListSelectionModel;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
import javax.swing.table.TableRowSorter;
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.event.KeyEvent;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.function.Function;
/**
* A Swing component that displays logging messages.
*/
public class SwingLogPane extends JPanel {
static final Column[] COLUMNS = {
new Column(LogEntryField.TIME, -"YYYY-MM-DD_HH:MM:SS.mmm".length(), true),
new Column(LogEntryField.LOGGER, "com.example.class".length(), true),
new Column(LogEntryField.LEVEL, -"ERROR".length(), true),
new Column(LogEntryField.MESSAGE, 80, false)
};
private final LogBuffer buffer;
private final JTable table;
private final JTextArea details;
private final LogTableModel model;
private final Function colorize;
private final JSplitPane splitPane;
private final java.util.List tableColumns = new ArrayList<>();
private final TableRowSorter tableRowSorter;
private Function format = LogEntry::toString;
private double dividerLocation = 0.5;
private final JScrollPane scrollPaneTable;
private List selectedEntries = Collections.emptyList();
/**
* Creates a new instance of SwingLogPane with the default buffer size and connects all known loggers.
* @see LogBuffer#DEFAULT_CAPACITY
*/
public SwingLogPane() {
this(LogBuffer.DEFAULT_CAPACITY);
}
/**
* Creates a new instance of SwingLogPane with the given buffer size and connects all known loggers.
* @param bufferSize the buffer size
*/
public SwingLogPane(int bufferSize) {
this(createBuffer(bufferSize));
}
/**
* Creates a LogBuffer with the given buffer size and adds it to the global log entry handler.
*
* @param bufferSize the size of the buffer
* @return the created LogBuffer
*/
private static LogBuffer createBuffer(int bufferSize) {
LogBuffer buffer = new LogBuffer(bufferSize);
LogUtil.getGlobalDispatcher().addLogEntryHandler(buffer);
return buffer;
}
/**
* Constructs a new SwingLogPane with the given LogBuffer instance.
* This constructor calls another constructor with the defaultColorize method as the second argument.
*
* @param buffer the LogBuffer instance to be used for log messages
*/
public SwingLogPane(@Nullable LogBuffer buffer) {
this(buffer, SwingLogPane::defaultColorize);
}
/**
* Constructs a new SwingLogPane with the given LogBuffer instance and colorize function.
*
* @param logBuffer the LogBuffer instance to be used for log messages
* @param colorize the colorize function that determines the color for each log entry
*/
public SwingLogPane(@Nullable LogBuffer logBuffer, Function colorize) {
super(new BorderLayout());
this.buffer = logBuffer == null ? createBuffer(LogBuffer.DEFAULT_CAPACITY) : logBuffer;
this.colorize = colorize;
this.model = new LogTableModel(buffer);
this.tableRowSorter = new TableRowSorter<>(model) {
@Override
public void sort() {
model.executeRead(super::sort);
}
};
// create the table
table = new JTable(model) {
@Override
public void paintComponent(Graphics g) {
model.executeRead(() -> super.paintComponent(g));
}
};
// create the detail pane
details = new JTextArea(5, 80);
// column settings
AwtFontUtil fu = AwtFontUtil.getInstance();
TableColumnModel columnModel = table.getColumnModel();
for (int i = 0; i < columnModel.getColumnCount(); i++) {
Column cd = COLUMNS[i];
TableColumn column = columnModel.getColumn(i);
TableCellRenderer r = new LogEntryFieldCellRenderer(cd.field());
column.setCellRenderer(r);
java.awt.Font font = table.getFont();
int chars = cd.preferredCharWidth();
//noinspection NumericCastThatLosesPrecision
int width = (int) Math.ceil(fu.getTextWidth("M".repeat(Math.abs(chars)), font));
if (chars >= 0) {
column.setPreferredWidth(width);
} else {
column.setMinWidth(width);
column.setMaxWidth(width);
column.setWidth(width);
}
}
table.setAutoResizeMode(JTable.AUTO_RESIZE_LAST_COLUMN);
// update detail pane when entry is selected
table.getSelectionModel().addListSelectionListener(evt -> model.executeRead(() -> {
ListSelectionModel lsm = (ListSelectionModel) evt.getSource();
if (evt.getValueIsAdjusting()) {
return;
}
SwingUtilities.invokeLater(() -> {
final List newEntries = new ArrayList<>(lsm.getMaxSelectionIndex() - lsm.getMinSelectionIndex() + 1);
for (int i = lsm.getMinSelectionIndex(); i <= lsm.getMaxSelectionIndex(); i++) {
if (lsm.isSelectedIndex(i)) {
int idxModel = tableRowSorter.convertRowIndexToModel(i);
newEntries.add(model.getValueAt(idxModel, 0));
}
}
boolean changed = newEntries.size() != selectedEntries.size();
if (!changed) {
for (int i=0; i fmt = format;
StringBuilder sb = new StringBuilder(128*newEntries.size());
for (LogEntry entry: newEntries) {
sb.append(fmt.apply(entry)).append("\n");
}
text = sb.toString();
details.setText(text);
details.setCaretPosition(0);
selectedEntries = newEntries;
});
}));
table.setRowSorter(tableRowSorter);
KeyStroke keyStroke = KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0);
table.getActionMap().put("escape", SwingUtil.createAction("escape", this::handleEscapeKey));
table.getInputMap(WHEN_IN_FOCUSED_WINDOW).put(keyStroke, "escape");
// prepare the ScrollPanes
this.scrollPaneTable = new JScrollPane(table);
JScrollPane scrollPaneDetails = new JScrollPane(details);
// create SplitPane for table and detail pane
splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, scrollPaneTable, scrollPaneDetails);
splitPane.setDividerLocation(dividerLocation);
final JScrollBar tableScroller = scrollPaneTable.getVerticalScrollBar();
model.addTableModelListener(evt -> {
// handle scrolling
SwingUtilities.invokeLater(() -> {
// if scroll position is on the last row and no row is selected, automatically scroll down when rows are inserted
if (table.getSelectedRowCount() == 0 && tableScroller.getValue() >= tableScroller.getMaximum() - tableScroller.getVisibleAmount() - 3 * table.getRowHeight()) {
// scroll to last row
boolean selectionEmpty = table.getSelectedRow() < 0;
if (selectionEmpty) {
scrollRowIntoView(model.getRowCount());
}
}
});
});
// create toolbar
JToolBar toolBar = new JToolBar(SwingConstants.HORIZONTAL);
// add filtering based on level
toolBar.add(new JLabel("Min Level:"));
JComboBox cbLevel = new JComboBox<>(LogLevel.values());
toolBar.add(cbLevel);
cbLevel.addItemListener(a -> setFilter((LogLevel) a.getItem()));
cbLevel.setSelectedItem(LogLevel.INFO);
// checkbox for text only
toolBar.add(new JSeparator(SwingConstants.VERTICAL));
JCheckBox cbTextOnly = new JCheckBox(SwingUtil.createAction("Show text only", evt -> setTextOnly(((JCheckBox) (evt.getSource())).isSelected())));
cbTextOnly.setSelected(true);
toolBar.add(cbTextOnly);
// buttons "clear" and "copy"
toolBar.add(new JSeparator(SwingConstants.VERTICAL));
toolBar.add(SwingUtil.createAction("Clear", this::clearBuffer));
toolBar.add(SwingUtil.createAction("Copy", this::copyBuffer));
add(toolBar, BorderLayout.PAGE_START);
add(splitPane, BorderLayout.CENTER);
setTextOnly(cbTextOnly.isSelected());
}
private static Color defaultColorize(LogEntry entry) {
return switch (entry.level()) {
case ERROR -> Color.DARKRED;
case WARN -> Color.RED;
case INFO -> Color.DARKBLUE;
case DEBUG -> Color.BLACK;
case TRACE -> Color.DARKGRAY;
};
}
private void setTextOnly(boolean textOnly) {
synchronized (model) {
TableColumnModel columnModel = table.getColumnModel();
// keep list of all columns
if (tableColumns.isEmpty()) {
for (int i = 0; i < columnModel.getColumnCount(); i++) {
tableColumns.add(columnModel.getColumn(i));
}
}
// remove all columns from model
while (columnModel.getColumnCount() > 0) {
columnModel.removeColumn(columnModel.getColumn(0));
}
// add visible columns again
for (int i = 0; i < table.getModel().getColumnCount(); i++) {
if (!textOnly || !COLUMNS[i].hideable()) {
table.getColumnModel().addColumn(tableColumns.get(i));
}
}
}
}
private void setFilter(LogLevel c) {
tableRowSorter.setRowFilter(new RowFilter(c));
}
private void handleEscapeKey() {
ListSelectionModel selectionModel = table.getSelectionModel();
int rows = model.getRowCount();
if (selectionModel.isSelectionEmpty() && rows > 0) {
// select last row
selectionModel.setSelectionInterval(rows - 1, rows - 1);
} else {
// clear selection and scroll to bottom
selectionModel.clearSelection();
scrollRowIntoView(rows);
}
}
/**
* Scrolls the specified row into view.
*
* @param row the row index to scroll into view
*/
public void scrollRowIntoView(int row) {
SwingUtilities.invokeLater(() -> {
Rectangle rect = new Rectangle(table.getCellRect(row, 0, true));
table.scrollRectToVisible(rect);
});
}
/**
* Scrolls the specified number of rows in the table.
*
* @param n the number of rows to scroll, positive values scroll down, negative values scroll up
*/
public void scrollNRows(int n) {
int rowHeight = table.getRowHeight();
JScrollBar verticalScrollBar = scrollPaneTable.getVerticalScrollBar();
SwingUtilities.invokeLater(() -> {
synchronized (verticalScrollBar) {
int value = verticalScrollBar.getValue() + rowHeight * n;
verticalScrollBar.setValue(value);
}
});
}
/**
* Set the formatter used to convert log entries to text.
*
* @param format the formatting function
*/
public void setLogFormatter(Function format) {
this.format = format;
}
/**
* Set the divider location. Analog to {@link JSplitPane#setDividerLocation(double)}.
*
* @param proportionalLocation the proportional location
*/
public void setDividerLocation(double proportionalLocation) {
this.dividerLocation = MathUtil.clamp(0.0, 1.0, proportionalLocation);
splitPane.setDividerLocation(dividerLocation);
}
/**
* Set the divider location. Analog to {@link JSplitPane#setDividerLocation(int)}.
*
* @param location the location
*/
public void setDividerLocation(int location) {
setDividerLocation((double) location / (splitPane.getHeight() - splitPane.getDividerSize()));
}
/**
* Clear the log buffer.
*/
public void clearBuffer() {
buffer.clear();
}
/**
* Copy contents of log buffer to clipboard.
*/
public void copyBuffer() {
try {
StringBuilder sb = new StringBuilder(16 * 1024);
buffer.appendTo(sb);
SwingUtil.setClipboardText(sb.toString());
} catch (IOException e) {
// StringBuilder shouldn't throw IOException
throw new UncheckedIOException(e);
}
}
@Override
public void setBounds(int x, int y, int width, int height) {
super.setBounds(x, y, width, height);
SwingUtilities.invokeLater(() ->
splitPane.setDividerLocation(dividerLocation)
);
}
enum LogEntryField {
LOGGER {
@Override
public String get(LogEntry entry) {
return entry.loggerName();
}
},
TIME {
@Override
public String get(LogEntry entry) {
return entry.time().toString();
}
},
LEVEL {
@Override
public String get(LogEntry entry) {
return entry.level().name();
}
},
MESSAGE {
@Override
public String get(LogEntry entry) {
return entry.message();
}
},
THROWABLE {
@Override
public String get(LogEntry entry) {
return entry.throwable().toString();
}
};
public abstract String get(LogEntry entry);
}
private static class RowFilter extends javax.swing.RowFilter {
private final LogLevel c;
public RowFilter(LogLevel c) {
this.c = c;
}
@Override
public boolean include(Entry entry) {
LogEntry value = (LogEntry) entry.getValue(0);
return value == null || value.level().compareTo(c) >= 0;
}
}
record Column(LogEntryField field, int preferredCharWidth, boolean hideable) {
}
private final class LogEntryFieldCellRenderer extends DefaultTableCellRenderer {
private final LogEntryField f;
private LogEntryFieldCellRenderer(LogEntryField f) {
this.f = f;
}
@Override
public void setValue(Object value) {
java.awt.Color color;
Object v;
if (value instanceof LogEntry entry) {
color = SwingUtil.toAwtColor(colorize.apply(entry));
v = f.get(entry);
} else {
color = java.awt.Color.BLACK;
v = value;
}
setForeground(color);
setBackground(table.getBackground());
super.setValue(v);
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if (isSelected) {
java.awt.Color fg = getForeground();
java.awt.Color bg = getBackground();
setForeground(bg);
setBackground(fg);
}
return this;
}
}
}
