basictableui.java

java jdk 1.4的源码

    /**
     * Return the maximum size of the table. The maximum height is the
     * row heighttimes the number of rows.
     * The maximum width is the sum of the maximum widths of each column.
     */
    public Dimension getMaximumSize(JComponent c) {
        long width = 0;
        Enumeration enumeration = table.getColumnModel().getColumns();
        while (enumeration.hasMoreElements()) {
            TableColumn aColumn = (TableColumn)enumeration.nextElement();
            width = width + aColumn.getMaxWidth();
        }
        return createTableSize(width);
    }

//
//  Paint methods and support
//

    /** Paint a representation of the <code>table</code> instance
     * that was set in installUI().
     */
    public void paint(Graphics g, JComponent c) {
	if (table.getRowCount() <= 0 || table.getColumnCount() <= 0) {
	    return;
	}
	Rectangle clip = g.getClipBounds();
	Point upperLeft = clip.getLocation();
	Point lowerRight = new Point(clip.x + clip.width - 1, clip.y + clip.height - 1);
        int rMin = table.rowAtPoint(upperLeft);
        int rMax = table.rowAtPoint(lowerRight);
        // This should never happen.
        if (rMin == -1) {
	    rMin = 0;
        }
        // If the table does not have enough rows to fill the view we'll get -1.
        // Replace this with the index of the last row.
        if (rMax == -1) {
	    rMax = table.getRowCount()-1;
        }

        boolean ltr = table.getComponentOrientation().isLeftToRight();
        int cMin = table.columnAtPoint(ltr ? upperLeft : lowerRight); 
        int cMax = table.columnAtPoint(ltr ? lowerRight : upperLeft);        
        // This should never happen.
        if (cMin == -1) {
	    cMin = 0;
        }
	// If the table does not have enough columns to fill the view we'll get -1.
        // Replace this with the index of the last column.
        if (cMax == -1) {
	    cMax = table.getColumnCount()-1;
        }

        // Paint the grid.
        paintGrid(g, rMin, rMax, cMin, cMax);

        // Paint the cells.
	paintCells(g, rMin, rMax, cMin, cMax);
    }

    /*
     * Paints the grid lines within <I>aRect</I>, using the grid
     * color set with <I>setGridColor</I>. Paints vertical lines
     * if <code>getShowVerticalLines()</code> returns true and paints
     * horizontal lines if <code>getShowHorizontalLines()</code>
     * returns true.
     */
    private void paintGrid(Graphics g, int rMin, int rMax, int cMin, int cMax) {
        g.setColor(table.getGridColor());

	Rectangle minCell = table.getCellRect(rMin, cMin, true);
	Rectangle maxCell = table.getCellRect(rMax, cMax, true);
        Rectangle damagedArea = minCell.union( maxCell );

        if (table.getShowHorizontalLines()) {
	    int tableWidth = damagedArea.x + damagedArea.width;
	    int y = damagedArea.y;
	    for (int row = rMin; row <= rMax; row++) {
		y += table.getRowHeight(row);
		g.drawLine(damagedArea.x, y - 1, tableWidth - 1, y - 1);
	    }
	}
        if (table.getShowVerticalLines()) {
	    TableColumnModel cm = table.getColumnModel();
	    int tableHeight = damagedArea.y + damagedArea.height;
	    int x;
	    if (table.getComponentOrientation().isLeftToRight()) {
		x = damagedArea.x;
		for (int column = cMin; column <= cMax; column++) {
		    int w = cm.getColumn(column).getWidth();
		    x += w;
		    g.drawLine(x - 1, 0, x - 1, tableHeight - 1);
		}
	    } else {
		x = damagedArea.x + damagedArea.width;
		for (int column = cMin; column < cMax; column++) {
		    int w = cm.getColumn(column).getWidth();
		    x -= w;
		    g.drawLine(x - 1, 0, x - 1, tableHeight - 1);
		}
		x -= cm.getColumn(cMax).getWidth();
		g.drawLine(x, 0, x, tableHeight - 1);
	    }
	}
    }

    private int viewIndexForColumn(TableColumn aColumn) {
        TableColumnModel cm = table.getColumnModel();
        for (int column = 0; column < cm.getColumnCount(); column++) {
            if (cm.getColumn(column) == aColumn) {
                return column;
            }
        }
        return -1;
    }

    private void paintCells(Graphics g, int rMin, int rMax, int cMin, int cMax) {
	JTableHeader header = table.getTableHeader();
	TableColumn draggedColumn = (header == null) ? null : header.getDraggedColumn();

	TableColumnModel cm = table.getColumnModel();
	int columnMargin = cm.getColumnMargin();

        Rectangle cellRect;
	TableColumn aColumn;
	int columnWidth;
	if (table.getComponentOrientation().isLeftToRight()) {
	    for(int row = rMin; row <= rMax; row++) {
		cellRect = table.getCellRect(row, cMin, false);
                for(int column = cMin; column <= cMax; column++) {
                    aColumn = cm.getColumn(column);
                    columnWidth = aColumn.getWidth();
                    cellRect.width = columnWidth - columnMargin;
                    if (aColumn != draggedColumn) {
                        paintCell(g, cellRect, row, column);
                    }
                    cellRect.x += columnWidth;
        	}
	    }
	} else {
	    for(int row = rMin; row <= rMax; row++) {
                cellRect = table.getCellRect(row, cMin, false);
                aColumn = cm.getColumn(cMin);
                if (aColumn != draggedColumn) {
                    columnWidth = aColumn.getWidth();
                    cellRect.width = columnWidth - columnMargin;
                    paintCell(g, cellRect, row, cMin);
                }
                for(int column = cMin+1; column <= cMax; column++) {
                    aColumn = cm.getColumn(column);
                    columnWidth = aColumn.getWidth();
                    cellRect.width = columnWidth - columnMargin;
                    cellRect.x -= columnWidth;
                    if (aColumn != draggedColumn) {
                        paintCell(g, cellRect, row, column);
                    }
        	}
	    }
	}

        // Paint the dragged column if we are dragging.
        if (draggedColumn != null) {
	    paintDraggedArea(g, rMin, rMax, draggedColumn, header.getDraggedDistance());
	}

	// Remove any renderers that may be left in the rendererPane.
	rendererPane.removeAll();
    }

    private void paintDraggedArea(Graphics g, int rMin, int rMax, TableColumn draggedColumn, int distance) {
        int draggedColumnIndex = viewIndexForColumn(draggedColumn);

        Rectangle minCell = table.getCellRect(rMin, draggedColumnIndex, true);
	Rectangle maxCell = table.getCellRect(rMax, draggedColumnIndex, true);

	Rectangle vacatedColumnRect = minCell.union(maxCell);

	// Paint a gray well in place of the moving column.
	g.setColor(table.getParent().getBackground());
	g.fillRect(vacatedColumnRect.x, vacatedColumnRect.y,
		   vacatedColumnRect.width, vacatedColumnRect.height);

	// Move to the where the cell has been dragged.
	vacatedColumnRect.x += distance;

	// Fill the background.
	g.setColor(table.getBackground());
	g.fillRect(vacatedColumnRect.x, vacatedColumnRect.y,
		   vacatedColumnRect.width, vacatedColumnRect.height);

	// Paint the vertical grid lines if necessary.
	if (table.getShowVerticalLines()) {
	    g.setColor(table.getGridColor());
	    int x1 = vacatedColumnRect.x;
	    int y1 = vacatedColumnRect.y;
	    int x2 = x1 + vacatedColumnRect.width - 1;
	    int y2 = y1 + vacatedColumnRect.height - 1;
	    // Left
	    g.drawLine(x1-1, y1, x1-1, y2);
	    // Right
	    g.drawLine(x2, y1, x2, y2);
	}

	for(int row = rMin; row <= rMax; row++) {
	    // Render the cell value
	    Rectangle r = table.getCellRect(row, draggedColumnIndex, false);
	    r.x += distance;
	    paintCell(g, r, row, draggedColumnIndex);

	    // Paint the (lower) horizontal grid line if necessary.
	    if (table.getShowHorizontalLines()) {
		g.setColor(table.getGridColor());
		Rectangle rcr = table.getCellRect(row, draggedColumnIndex, true);
		rcr.x += distance;
		int x1 = rcr.x;
		int y1 = rcr.y;
		int x2 = x1 + rcr.width - 1;
		int y2 = y1 + rcr.height - 1;
		g.drawLine(x1, y2, x2, y2);
	    }
	}
    }

    private void paintCell(Graphics g, Rectangle cellRect, int row, int column) {
        if (table.isEditing() && table.getEditingRow()==row &&
                                 table.getEditingColumn()==column) {
            Component component = table.getEditorComponent();
	    component.setBounds(cellRect);
            component.validate();
        }
        else {
            TableCellRenderer renderer = table.getCellRenderer(row, column);
            Component component = table.prepareRenderer(renderer, row, column);
            rendererPane.paintComponent(g, component, table, cellRect.x, cellRect.y,
                                        cellRect.width, cellRect.height, true);
        }
    }


    private static final TableDragGestureRecognizer defaultDragRecognizer = new TableDragGestureRecognizer();

    /**
     * Drag gesture recognizer for JTable components
     */
    static class TableDragGestureRecognizer extends BasicDragGestureRecognizer {

	/**
	 * Determines if the following are true:
	 * <ul>
	 * <li>the press event is located over a selection
	 * <li>the dragEnabled property is true
	 * <li>A TranferHandler is installed
	 * </ul>
	 * <p>
	 * This is implemented to perform the superclass behavior
	 * followed by a check if the dragEnabled
	 * property is set and if the location picked is selected.
	 */
        protected boolean isDragPossible(MouseEvent e) {
	    if (super.isDragPossible(e)) {
		JTable table = (JTable) this.getComponent(e);
		if (table.getDragEnabled()) {
		    Point p = e.getPoint();
		    int row = table.rowAtPoint(p);
		    int column = table.columnAtPoint(p);
		    if ((column != -1) && (row != -1) && table.isCellSelected(row, column)) {
			return true;
		    }
		}
	    }
	    return false;
	}
    }

    private static DropTargetListener defaultDropTargetListener = null;

    /**
     * A DropTargetListener to extend the default Swing handling of drop operations
     * by moving the tree selection to the nearest location to the mouse pointer.
     * Also adds autoscroll capability.
     */
    static class TableDropTargetListener extends BasicDropTargetListener {

	/**
	 * called to save the state of a component in case it needs to
	 * be restored because a drop is not performed.
	 */
        protected void saveComponentState(JComponent comp) {
	    JTable table = (JTable) comp;
	    rows = table.getSelectedRows();
	    cols = table.getSelectedColumns();
	}

	/**
	 * called to restore the state of a component
	 * because a drop was not performed.
	 */
        protected void restoreComponentState(JComponent comp) {
	    JTable table = (JTable) comp;
	    table.clearSelection();
	    for (int i = 0; i < rows.length; i++) {
		table.addRowSelectionInterval(rows[i], rows[i]);
	    }
	    for (int i = 0; i < cols.length; i++) {
		table.addColumnSelectionInterval(cols[i], cols[i]);
	    }
	}

	/**
	 * called to set the insertion location to match the current
	 * mouse pointer coordinates.
	 */
        protected void updateInsertionLocation(JComponent comp, Point p) {
	    JTable table = (JTable) comp;
            int row = table.rowAtPoint(p);
            int col = table.columnAtPoint(p);
	    if (row != -1) {
		table.setRowSelectionInterval(row, row);
	    }
	    if (col != -1) {
		table.setColumnSelectionInterval(col, col);
	    }
	}

	private int[] rows;
	private int[] cols;
    }

    private static final TransferHandler defaultTransferHandler = new TableTransferHandler();

    static class TableTransferHandler extends TransferHandler implements UIResource {

	/**
	 * Create a Transferable to use as the source for a data transfer.
	 *
	 * @param c  The component holding the data to be transfered.  This
	 *  argument is provided to enable sharing of TransferHandlers by
	 *  multiple components.
	 * @return  The representation of the data to be transfered.
	 *
	 */
        protected Transferable createTransferable(JComponent c) {
	    if (c instanceof JTable) {
		JTable table = (JTable) c;
		int[] rows;
		int[] cols;
		
		if (!table.getRowSelectionAllowed() && !table.getColumnSelectionAllowed()) {
		    return null;
		}
		
                if (!table.getRowSelectionAllowed()) {
                    int rowCount = table.getRowCount();

                    rows = new int[rowCount];
                    for (int counter = 0; counter < rowCount; counter++) {
                        rows[counter] = counter;
                    }
                } else {
		    rows = table.getSelectedRows();
		}
		
                if (!table.getColumnSelectionAllowed()) {
                    int colCount = table.getColumnCount();

                    cols = new int[colCount];
                    for (int counter = 0; counter < colCount; counter++) {
                        cols[counter] = counter;
                    }
                } else {
		    cols = table.getSelectedColumns();
		}
                
		if (rows == null || cols == null || rows.length == 0 || cols.length == 0) {
		    return null;
		}
                
                StringBuffer plainBuf = new StringBuffer();
                StringBuffer htmlBuf = new StringBuffer();
                
                htmlBuf.append("<html>\n<body>\n<table>\n");
                
                for (int row = 0; row < rows.length; row++) {
                    htmlBuf.append("<tr>\n");
                    for (int col = 0; col < cols.length; col++) {
                        Object obj = table.getValueAt(rows[row], cols[col]);
                        String val = ((obj == null) ? "" : obj.toString());
                        plainBuf.append(val + "\t");
                        htmlBuf.append("  <td>" + val + "</td>\n");
                    }
                    // we want a newline at the end of each line and not a tab
                    plainBuf.deleteCharAt(plainBuf.length() - 1).append("\n");
                    htmlBuf.append("</tr>\n");
                }

                // remove the last newline
                plainBuf.deleteCharAt(plainBuf.length() - 1);
                htmlBuf.append("</table>\n</body>\n</html>");
                
                return new BasicTransferable(plainBuf.toString(), htmlBuf.toString());
	    }

	    return null;
	}

        public int getSourceActions(JComponent c) {
	    return COPY;
	}

    }

    /**
     * PropertyChangeListener for the table. Updates the appropriate
     * varaible, or TreeState, based on what changes.
     */
    private class PropertyChangeHandler implements
	               PropertyChangeListener {
	public void propertyChange(PropertyChangeEvent event) {
	    String changeName = event.getPropertyName();

	    if (changeName.equals("componentOrientation")) {
		InputMap inputMap = getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
		SwingUtilities.replaceUIInputMap(table,
				JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT,
				inputMap);

		UIManager.getLookAndFeelDefaults().put("Table.actionMap",
                                                       null);
		ActionMap actionMap = getActionMap();
		SwingUtilities.replaceUIActionMap(table, actionMap);

		JTableHeader header = table.getTableHeader();
		if (header != null) {
		    header.setComponentOrientation((ComponentOrientation)event.getNewValue());
		}
            } else if ("transferHandler".equals(changeName)) {
                DropTarget dropTarget = table.getDropTarget();
                if (dropTarget instanceof UIResource) {
                    if (defaultDropTargetListener == null) {
                        defaultDropTargetListener = new TableDropTargetListener();
                    }
                    try {
                        dropTarget.addDropTargetListener(defaultDropTargetListener);
                    } catch (TooManyListenersException tmle) {
                        // should not happen... swing drop target is multicast
                    }
                }
            }
	}
    } // End of BasicTableUI.PropertyChangeHandler

}  // End of Class BasicTableUI