basictableheaderui.java

JAVA 所有包

        mouseInputListener = createMouseInputListener();

        header.addMouseListener(mouseInputListener);
        header.addMouseMotionListener(mouseInputListener);
        header.addFocusListener(focusListener);
    }

    /**
     * Register all keyboard actions on the JTableHeader.
     */
    protected void installKeyboardActions() {
        InputMap keyMap = (InputMap)DefaultLookup.get(header, this,
                "TableHeader.ancestorInputMap");
	SwingUtilities.replaceUIInputMap(header,                
                                JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, keyMap);
        LazyActionMap.installLazyActionMap(header, BasicTableHeaderUI.class,
                "TableHeader.actionMap");
    }

// Uninstall methods

    public void uninstallUI(JComponent c) {
        uninstallDefaults();
        uninstallListeners();
        uninstallKeyboardActions();

        header.remove(rendererPane);
        rendererPane = null;
        header = null;
    }

    protected void uninstallDefaults() {}

    protected void uninstallListeners() {
        header.removeMouseListener(mouseInputListener);
        header.removeMouseMotionListener(mouseInputListener);

        mouseInputListener = null;
    }

    /**
     * Unregisters default key actions.
     */
    protected void uninstallKeyboardActions() {
        SwingUtilities.replaceUIInputMap(header, JComponent.WHEN_FOCUSED, null);
        SwingUtilities.replaceUIActionMap(header, null);
    }

    /**
     * Populates TableHeader's actions.
     */
    static void loadActionMap(LazyActionMap map) {
        map.put(new Actions(Actions.TOGGLE_SORT_ORDER));
        map.put(new Actions(Actions.SELECT_COLUMN_TO_LEFT));
        map.put(new Actions(Actions.SELECT_COLUMN_TO_RIGHT));
        map.put(new Actions(Actions.MOVE_COLUMN_LEFT));
        map.put(new Actions(Actions.MOVE_COLUMN_RIGHT));
        map.put(new Actions(Actions.RESIZE_LEFT));
        map.put(new Actions(Actions.RESIZE_RIGHT));
        map.put(new Actions(Actions.FOCUS_TABLE));
    }

//
// Support for mouse rollover
//

    /**
     * Returns the index of the column header over which the mouse
     * currently is. When the mouse is not over the table header,
     * -1 is returned.
     *
     * @see #rolloverColumnUpdated(int, int)
     * @return the index of the current rollover column
     * @since 1.6
     */
    protected int getRolloverColumn() {
        return rolloverColumn;
    }

    /**
     * This method gets called every time the rollover column in the table
     * header is updated. Every look and feel supporting rollover effect
     * in table header should override this method and repaint the header.
     *
     * @param oldColumn the index of the previous rollover column or -1 if the
     * mouse was not over a column
     * @param newColumn the index of the new rollover column or -1 if the mouse
     * is not over a column
     * @see #getRolloverColumn()
     * @see JTableHeader#getHeaderRect(int)
     * @since 1.6
     */
    protected void rolloverColumnUpdated(int oldColumn, int newColumn) {
    }

    private void updateRolloverColumn(MouseEvent e) {
        if (header.getDraggedColumn() == null &&
            header.contains(e.getPoint())) {

            int col = header.columnAtPoint(e.getPoint());
            if (col != rolloverColumn) {
                int oldRolloverColumn = rolloverColumn;
                rolloverColumn = col;
                rolloverColumnUpdated(oldRolloverColumn, rolloverColumn);
            }
        }
    }

//
// Support for keyboard and mouse access
//
    private int selectNextColumn(boolean doIt) {
        int newIndex = getSelectedColumnIndex();
        if (newIndex < header.getColumnModel().getColumnCount() - 1) {
            newIndex++;
            if (doIt) {
                selectColumn(newIndex);
            }
        }
        return newIndex;
    }
    
    private int selectPreviousColumn(boolean doIt) {
        int newIndex = getSelectedColumnIndex();
        if (newIndex > 0) {
            newIndex--;
            if (doIt) {
                selectColumn(newIndex);
            }
        }
        return newIndex;
    }
    
    /**
     * Selects the specified column in the table header. Repaints the
     * affected header cells and makes sure the newly selected one is visible.
     */
    void selectColumn(int newColIndex) {
        Rectangle repaintRect = header.getHeaderRect(selectedColumnIndex);
        header.repaint(repaintRect);
        selectedColumnIndex = newColIndex;
        repaintRect = header.getHeaderRect(newColIndex);
        header.repaint(repaintRect);
                    
        scrollToColumn(newColIndex);
        return;
    }
    
    /**
     * Used by selectColumn to scroll horizontally, if necessary,
     * to ensure that the newly selected column is visible.
     */
    private void scrollToColumn(int col) {
        Container container;
        JTable table;
        
        //Test whether the header is in a scroll pane and has a table.
        if ((header.getParent() == null) ||
            ((container = header.getParent().getParent()) == null) ||
            !(container instanceof JScrollPane) ||
            ((table = header.getTable()) == null)) {
            return;
        }

        //Now scroll, if necessary.
        Rectangle vis = table.getVisibleRect();
        Rectangle cellBounds = table.getCellRect(0, col, true);
        vis.x = cellBounds.x;
        vis.width = cellBounds.width;
        table.scrollRectToVisible(vis);
    }
    
    private int getSelectedColumnIndex() {
        int numCols = header.getColumnModel().getColumnCount();
        if (selectedColumnIndex >= numCols && numCols > 0) {
            selectedColumnIndex = numCols - 1;
        }
        return selectedColumnIndex;
    }
    
    private static boolean canResize(TableColumn column,
                                     JTableHeader header) { 
        return (column != null) && header.getResizingAllowed()
                                && column.getResizable(); 
    }
    
    private int changeColumnWidth(TableColumn resizingColumn,
                                  JTableHeader th,
                                  int oldWidth, int newWidth) {
        resizingColumn.setWidth(newWidth);
        
        Container container;
        JTable table;

        if ((th.getParent() == null) ||
            ((container = th.getParent().getParent()) == null) ||
            !(container instanceof JScrollPane) ||
            ((table = th.getTable()) == null)) {
            return 0;
        }

        if (!container.getComponentOrientation().isLeftToRight() &&
                !th.getComponentOrientation().isLeftToRight()) {
                JViewport viewport = ((JScrollPane)container).getViewport();
                int viewportWidth = viewport.getWidth();
                int diff = newWidth - oldWidth;
                int newHeaderWidth = table.getWidth() + diff;

                /* Resize a table */
                Dimension tableSize = table.getSize();
                tableSize.width += diff;
                table.setSize(tableSize);

                /* If this table is in AUTO_RESIZE_OFF mode and
                 * has a horizontal scrollbar, we need to update
                 * a view's position.
                 */
                if ((newHeaderWidth >= viewportWidth) &&
                    (table.getAutoResizeMode() == JTable.AUTO_RESIZE_OFF)) {
                    Point p = viewport.getViewPosition();
                    p.x = Math.max(0, Math.min(newHeaderWidth - viewportWidth,
                                               p.x + diff));
                    viewport.setViewPosition(p);
                    return diff;
            }
        }
        return 0;
    }

//
// Baseline
//

    /**
     * Returns the baseline.
     *
     * @throws NullPointerException {@inheritDoc}
     * @throws IllegalArgumentException {@inheritDoc}
     * @see javax.swing.JComponent#getBaseline(int, int)
     * @since 1.6
     */
    public int getBaseline(JComponent c, int width, int height) {
        super.getBaseline(c, width, height);
        int baseline = -1;
        TableColumnModel columnModel = header.getColumnModel();
        for(int column = 0; column < columnModel.getColumnCount();
            column++) { 
            TableColumn aColumn = columnModel.getColumn(column); 
            Component comp = getHeaderRenderer(column); 
            Dimension pref = comp.getPreferredSize();
            int columnBaseline = comp.getBaseline(pref.width, height);
            if (columnBaseline >= 0) {
                if (baseline == -1) {
                    baseline = columnBaseline;
                }
                else if (baseline != columnBaseline) {
                    baseline = -1;
                    break;
                }
            }
        }
        return baseline;
    }

//
// Paint Methods and support
//

    public void paint(Graphics g, JComponent c) {
	if (header.getColumnModel().getColumnCount() <= 0) { 
	    return; 
	}
        boolean ltr = header.getComponentOrientation().isLeftToRight();

	Rectangle clip = g.getClipBounds(); 
        Point left = clip.getLocation();
        Point right = new Point( clip.x + clip.width - 1, clip.y );
	TableColumnModel cm = header.getColumnModel(); 
        int cMin = header.columnAtPoint( ltr ? left : right );
        int cMax = header.columnAtPoint( ltr ? right : left );
        // 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 = cm.getColumnCount()-1;  
        }

	TableColumn draggedColumn = header.getDraggedColumn(); 
	int columnWidth;
        Rectangle cellRect = header.getHeaderRect(ltr ? cMin : cMax); 
	TableColumn aColumn;
	if (ltr) {
	    for(int column = cMin; column <= cMax ; column++) { 
		aColumn = cm.getColumn(column); 
		columnWidth = aColumn.getWidth();
		cellRect.width = columnWidth;
		if (aColumn != draggedColumn) {
		    paintCell(g, cellRect, column);
		} 
		cellRect.x += columnWidth;
	    }
	} else {
	    for(int column = cMax; column >= cMin; column--) {