fileexplorertablemodel.java

具有不同语法高亮的编辑器实例

	public void setTable(JTable table) {
		this.table = table;
		setTableHeader(table.getTableHeader());
	}


/*****************************************************************************/


	/**
	 * Sets the table header to use.
	 *
	 * @param tableHeader The table header to use.
	 * @see #getTableHeader
	 */
	private void setTableHeader(JTableHeader tableHeader) {

		// Remove our mouse listener from the old table header and restore the
		// default renderer to the old table header.
		if (this.tableHeader != null) {
			this.tableHeader.removeMouseListener(mouseListener);
			TableCellRenderer defaultRenderer = this.tableHeader.getDefaultRenderer();
			if (defaultRenderer instanceof SortableHeaderRenderer) {
				SortableHeaderRenderer shr = (SortableHeaderRenderer)defaultRenderer;
				this.tableHeader.setDefaultRenderer(shr.tableCellRenderer);
				shr = null;
			}
		}

		// Set our new table header, give it the "sortable header" renderer and
		// add a mouse listener.
		this.tableHeader = tableHeader;
		if (this.tableHeader != null) {
			this.tableHeader.addMouseListener(mouseListener);
			this.tableHeader.setDefaultRenderer(
				new SortableHeaderRenderer(this.tableHeader.getDefaultRenderer()));
		}

	}


/*****************************************************************************/


	/**
	 * Sets the table model to use.
	 *
	 * @param tableModel The table model to use.
	 * @see #getTableModel
	 */
	public void setTableModel(TableModel tableModel) {

		// Remove the table model listener from the old table model and add it
		// to the new table model.
		if (this.tableModel!=null)
			this.tableModel.removeTableModelListener(tableModelListener);
		this.tableModel = tableModel;
		if (this.tableModel!=null)
			this.tableModel.addTableModelListener(tableModelListener);

		// Housekeeping.
		clearSortingState();
		fireTableStructureChanged();

	}


/*****************************************************************************/


	private void sortingStatusChanged() {
		clearSortingState();
		fireTableDataChanged();
		if (tableHeader != null)
			tableHeader.repaint();
	}


/*****************************************************************************/


	// TableModel interface methods 

	public int getRowCount() {
		return (tableModel == null) ? 0 : tableModel.getRowCount();
	}

	public int getColumnCount() {
		return (tableModel == null) ? 0 : tableModel.getColumnCount();
	}

	public String getColumnName(int column) {
		return tableModel.getColumnName(column);
	}

	public Class getColumnClass(int column) {
		return tableModel.getColumnClass(column);
	}

	public boolean isCellEditable(int row, int column) {
		return tableModel.isCellEditable(modelIndex(row), column);
	}

	public Object getValueAt(int row, int column) {
		return tableModel.getValueAt(modelIndex(row), column);
	}

	public void setValueAt(Object aValue, int row, int column) {
		tableModel.setValueAt(aValue, modelIndex(row), column);
	}


/*****************************************************************************/
/********************** PRIVATE INNER CLASSES ********************************/
/*****************************************************************************/


	private static class Arrow implements Icon {

		private boolean descending;
		private int size;
		private int priority;

		public Arrow(boolean descending, int size, int priority) {
			this.descending = descending;
			this.size = size;
			this.priority = priority;
		}

		public void paintIcon(Component c, Graphics g, int x, int y) {

			Color color = c == null ? Color.GRAY : c.getBackground();             

			// In a compound sort, make each succesive triangle 20% 
			// smaller than the previous one. 
			int dx = (int)(size/2*Math.pow(0.8, priority));
			int dy = descending ? dx : -dx;

			// Align icon (roughly) with font baseline. 
			y = y + 5*size/6 + (descending ? -dy : 0);
			int shift = descending ? 1 : -1;
			g.translate(x, y);

			// Right diagonal. 
			g.setColor(color.darker());
			g.drawLine(dx / 2, dy, 0, 0);
			g.drawLine(dx / 2, dy + shift, 0, shift);
            
			// Left diagonal. 
			g.setColor(color.brighter());
			g.drawLine(dx / 2, dy, dx, 0);
			g.drawLine(dx / 2, dy + shift, dx, shift);
            
			// Horizontal line. 
			if (descending)
				g.setColor(color.darker().darker());
			else
				g.setColor(color.brighter().brighter());
			g.drawLine(dx, 0, 0, 0);

			g.setColor(color);
			g.translate(-x, -y);

		}

		public int getIconWidth() {
			return size;
		}

		public int getIconHeight() {
			return size;
		}

	}


/*****************************************************************************/


	/**
	 * A column and direction paired together.
	 */
	private static class Directive {

		private int column;
		private int direction;

		public Directive(int column, int direction) {
			this.column = column;
			this.direction = direction;
		}

	}


/*****************************************************************************/


	private class Row implements Comparable {

		private int modelIndex;

		public Row(int index) {
			this.modelIndex = index;
		}

		public int compareTo(Object o) {

			int row1 = modelIndex;
			int row2 = ((Row) o).modelIndex;

			for (Iterator it = sortingColumns.iterator(); it.hasNext();) {

				Directive directive = (Directive) it.next();
				int column = directive.column;
				Object o1 = tableModel.getValueAt(row1, column);
				Object o2 = tableModel.getValueAt(row2, column);

				int comparison = 0;
				// Define null less than everything, except null.
				if (o1 == null && o2 == null)
					comparison = 0;
				else if (o1 == null)
					comparison = -1;
				else if (o2 == null)
					comparison = 1;
				else
					comparison = getComparator(column).compare(o1, o2);
				if (comparison != 0)
					return directive.direction == DESCENDING ? -comparison : comparison;

			} // End of for (Iterator it = sortingColumns.iterator(); it.hasNext();).

			return 0;

		}

	}


/*****************************************************************************/


	private class MouseHandler extends MouseAdapter {

		public void mouseClicked(MouseEvent e) {

			// Left-clicks mean to sort by the column.
			if (e.getButton()==MouseEvent.BUTTON1) {
				JTableHeader h = (JTableHeader) e.getSource();
				TableColumnModel columnModel = h.getColumnModel();
				int viewColumn = columnModel.getColumnIndexAtX(e.getX());
				int column = columnModel.getColumn(viewColumn).getModelIndex();
				if (column != -1) {
					int status = getSortingStatus(column);
					if (!e.isControlDown()) {
						cancelSorting();
					}
					// Cycle the sorting states through {NOT_SORTED, ASCENDING, DESCENDING} or 
					// {NOT_SORTED, DESCENDING, ASCENDING} depending on whether shift is pressed. 
					status = status + (e.isShiftDown() ? -1 : 1);
					status = (status + 4) % 3 - 1; // signed mod, returning {-1, 0, 1}
					setSortingStatus(column, status);
				}
			}
/*
			// Right-clicks bring up the "visible columns" popup menu.
			else {
				// Recreate it every time as the programmer may have added/removed columns.
				// This also keeps us from having to worry about LnF changes.
				createRightClickMenu();
				rightClickMenu.show(tableHeader, e.getX(), e.getY());
			}
*/
		}

	}


/*****************************************************************************/


	/**
	 * A cell renderer for column headers for sorted tables.  This renderer
	 * will draw an "up" or "down" arrow beside a column's name if the table
	 * is sorted by that column.
	 */
	private class SortableHeaderRenderer implements TableCellRenderer, UIResource {

		private TableCellRenderer tableCellRenderer;

		public SortableHeaderRenderer(TableCellRenderer tableCellRenderer) {
			this.tableCellRenderer = tableCellRenderer;
		}

		public Component getTableCellRendererComponent(JTable table, 
											Object value,
											boolean isSelected, 
											boolean hasFocus,
											int row, 
											int column)
		{
			Component c = tableCellRenderer.getTableCellRendererComponent(table, 
									value, isSelected, hasFocus, row, column);
			if (c instanceof JLabel) {
				JLabel l = (JLabel) c;
				l.setHorizontalTextPosition(JLabel.LEFT);
				int modelColumn = table.convertColumnIndexToModel(column);
				l.setIcon(getHeaderRendererIcon(modelColumn, l.getFont().getSize()));
			}
			return c;
		}

	}


/*****************************************************************************/


	private class TableModelHandler implements TableModelListener {

		public void tableChanged(TableModelEvent e) {

			// If we're not sorting by anything, just pass the event along.             
			if (!isSorting()) {
				clearSortingState();
				fireTableChanged(e);
				return;
			}
                
			// If the table structure has changed, cancel the sorting; the             
			// sorting columns may have been either moved or deleted from             
			// the model. 
			if (e.getFirstRow() == TableModelEvent.HEADER_ROW) {
				cancelSorting();
				fireTableChanged(e);
				return;
			}

			// We can map a cell event through to the view without widening             
			// when the following conditions apply: 
			// 
			// a) all the changes are on one row (e.getFirstRow() == e.getLastRow()) and, 
			// b) all the changes are in one column (column != TableModelEvent.ALL_COLUMNS) and,
			// c) we are not sorting on that column (getSortingStatus(column) == NOT_SORTED) and, 
			// d) a reverse lookup will not trigger a sort (modelToView != null)
			//
			// Note: INSERT and DELETE events fail this test as they have column == ALL_COLUMNS.
			// 
			// The last check, for (modelToView != null) is to see if modelToView 
			// is already allocated. If we don't do this check; sorting can become 
			// a performance bottleneck for applications where cells  
			// change rapidly in different parts of the table. If cells 
			// change alternately in the sorting column and then outside of             
			// it this class can end up re-sorting on alternate cell updates - 
			// which can be a performance problem for large tables. The last 
			// clause avoids this problem. 
			int column = e.getColumn();
			if (e.getFirstRow() == e.getLastRow()
				&& column != TableModelEvent.ALL_COLUMNS
				&& getSortingStatus(column) == NOT_SORTED
				&& modelToView != null)
			{
				int viewIndex = getModelToView()[e.getFirstRow()];
				fireTableChanged(new TableModelEvent(FileExplorerTableModel.this, 
											viewIndex, viewIndex, 
											column, e.getType()));
				return;
			}

			// Something has happened to the data that may have invalidated the row order. 
			clearSortingState();
			fireTableDataChanged();
			return;

		}

	}


/*****************************************************************************/

}