JDK8/Java8源码在线阅读

/*
 * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package javax.swing.plaf.synth;

import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Rectangle;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.text.DateFormat;
import java.text.Format;
import java.text.NumberFormat;
import java.util.Date;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JCheckBox;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JTable;
import javax.swing.LookAndFeel;
import javax.swing.border.Border;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.BasicTableUI;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;

/**
 * Provides the Synth L&F UI delegate for
 * {@link javax.swing.JTable}.
 *
 * @author Philip Milne
 * @since 1.7
 */
public class SynthTableUI extends BasicTableUI
                          implements SynthUI, PropertyChangeListener {
//
// Instance Variables
//

    private SynthStyle style;

    private boolean useTableColors;
    private boolean useUIBorder;
    private Color alternateColor; //the background color to use for cells for alternate cells

    // TableCellRenderer installed on the JTable at the time we're installed,
    // cached so that we can reinstall them at uninstallUI time.
    private TableCellRenderer dateRenderer;
    private TableCellRenderer numberRenderer;
    private TableCellRenderer doubleRender;
    private TableCellRenderer floatRenderer;
    private TableCellRenderer iconRenderer;
    private TableCellRenderer imageIconRenderer;
    private TableCellRenderer booleanRenderer;
    private TableCellRenderer objectRenderer;

//
//  The installation/uninstall procedures and support
//

    /**
     * Creates a new UI object for the given component.
     *
     * @param c component to create UI object for
     * @return the UI object
     */
    public static ComponentUI createUI(JComponent c) {
        return new SynthTableUI();
    }

    /**
     * Initializes JTable properties, such as font, foreground, and background.
     * The font, foreground, and background properties are only set if their
     * current value is either null or a UIResource, other properties are set
     * if the current value is null.
     *
     * @see #installUI
     */
    @Override
    protected void installDefaults() {
        dateRenderer = installRendererIfPossible(Date.class, null);
        numberRenderer = installRendererIfPossible(Number.class, null);
        doubleRender = installRendererIfPossible(Double.class, null);
        floatRenderer = installRendererIfPossible(Float.class, null);
        iconRenderer = installRendererIfPossible(Icon.class, null);
        imageIconRenderer = installRendererIfPossible(ImageIcon.class, null);
        booleanRenderer = installRendererIfPossible(Boolean.class,
                                 new SynthBooleanTableCellRenderer());
        objectRenderer = installRendererIfPossible(Object.class,
                                        new SynthTableCellRenderer());
        updateStyle(table);
    }

    private TableCellRenderer installRendererIfPossible(Class objectClass,
                                     TableCellRenderer renderer) {
        TableCellRenderer currentRenderer = table.getDefaultRenderer(
                                 objectClass);
        if (currentRenderer instanceof UIResource) {
            table.setDefaultRenderer(objectClass, renderer);
        }
        return currentRenderer;
    }

    private void updateStyle(JTable c) {
        SynthContext context = getContext(c, ENABLED);
        SynthStyle oldStyle = style;
        style = SynthLookAndFeel.updateStyle(context, this);
        if (style != oldStyle) {
            context.setComponentState(ENABLED | SELECTED);

            Color sbg = table.getSelectionBackground();
            if (sbg == null || sbg instanceof UIResource) {
                table.setSelectionBackground(style.getColor(
                                        context, ColorType.TEXT_BACKGROUND));
            }

            Color sfg = table.getSelectionForeground();
            if (sfg == null || sfg instanceof UIResource) {
                table.setSelectionForeground(style.getColor(
                                  context, ColorType.TEXT_FOREGROUND));
            }

            context.setComponentState(ENABLED);

            Color gridColor = table.getGridColor();
            if (gridColor == null || gridColor instanceof UIResource) {
                gridColor = (Color)style.get(context, "Table.gridColor");
                if (gridColor == null) {
                    gridColor = style.getColor(context, ColorType.FOREGROUND);
                }
                table.setGridColor(gridColor == null ? new ColorUIResource(Color.GRAY) : gridColor);
            }

            useTableColors = style.getBoolean(context,
                                  "Table.rendererUseTableColors", true);
            useUIBorder = style.getBoolean(context,
                                  "Table.rendererUseUIBorder", true);

            Object rowHeight = style.get(context, "Table.rowHeight");
            if (rowHeight != null) {
                LookAndFeel.installProperty(table, "rowHeight", rowHeight);
            }
            boolean showGrid = style.getBoolean(context, "Table.showGrid", true);
            if (!showGrid) {
                table.setShowGrid(false);
            }
            Dimension d = table.getIntercellSpacing();
//            if (d == null || d instanceof UIResource) {
            if (d != null) {
                d = (Dimension)style.get(context, "Table.intercellSpacing");
            }
            alternateColor = (Color)style.get(context, "Table.alternateRowColor");
            if (d != null) {
                table.setIntercellSpacing(d);
            }


            if (oldStyle != null) {
                uninstallKeyboardActions();
                installKeyboardActions();
            }
        }
        context.dispose();
    }

    /**
     * Attaches listeners to the JTable.
     */
    @Override
    protected void installListeners() {
        super.installListeners();
        table.addPropertyChangeListener(this);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected void uninstallDefaults() {
        table.setDefaultRenderer(Date.class, dateRenderer);
        table.setDefaultRenderer(Number.class, numberRenderer);
        table.setDefaultRenderer(Double.class, doubleRender);
        table.setDefaultRenderer(Float.class, floatRenderer);
        table.setDefaultRenderer(Icon.class, iconRenderer);
        table.setDefaultRenderer(ImageIcon.class, imageIconRenderer);
        table.setDefaultRenderer(Boolean.class, booleanRenderer);
        table.setDefaultRenderer(Object.class, objectRenderer);

        if (table.getTransferHandler() instanceof UIResource) {
            table.setTransferHandler(null);
        }
        SynthContext context = getContext(table, ENABLED);
        style.uninstallDefaults(context);
        context.dispose();
        style = null;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected void uninstallListeners() {
        table.removePropertyChangeListener(this);
        super.uninstallListeners();
    }

    //
    // SynthUI
    //

    /**
     * {@inheritDoc}
     */
    @Override
    public SynthContext getContext(JComponent c) {
        return getContext(c, SynthLookAndFeel.getComponentState(c));
    }

    private SynthContext getContext(JComponent c, int state) {
        return SynthContext.getContext(c, style, state);
    }

//
//  Paint methods and support
//

    /**
     * Notifies this UI delegate to repaint the specified component.
     * This method paints the component background, then calls
     * the {@link #paint(SynthContext,Graphics)} method.
     *
     * <p>In general, this method does not need to be overridden by subclasses.
     * All Look and Feel rendering code should reside in the {@code paint} method.
     *
     * @param g the {@code Graphics} object used for painting
     * @param c the component being painted
     * @see #paint(SynthContext,Graphics)
     */
    @Override
    public void update(Graphics g, JComponent c) {
        SynthContext context = getContext(c);

        SynthLookAndFeel.update(context, g);
        context.getPainter().paintTableBackground(context,
                          g, 0, 0, c.getWidth(), c.getHeight());
        paint(context, g);
        context.dispose();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void paintBorder(SynthContext context, Graphics g, int x,
                            int y, int w, int h) {
        context.getPainter().paintTableBorder(context, g, x, y, w, h);
    }

    /**
     * Paints the specified component according to the Look and Feel.
     * <p>This method is not used by Synth Look and Feel.
     * Painting is handled by the {@link #paint(SynthContext,Graphics)} method.
     *
     * @param g the {@code Graphics} object used for painting
     * @param c the component being painted
     * @see #paint(SynthContext,Graphics)
     */
    @Override
    public void paint(Graphics g, JComponent c) {
        SynthContext context = getContext(c);

        paint(context, g);
        context.dispose();
    }

    /**
     * Paints the specified component.
     *
     * @param context context for the component being painted
     * @param g the {@code Graphics} object used for painting
     * @see #update(Graphics,JComponent)
     */
    protected void paint(SynthContext context, Graphics g) {
        Rectangle clip = g.getClipBounds();

        Rectangle bounds = table.getBounds();
        // account for the fact that the graphics has already been translated
        // into the table's bounds
        bounds.x = bounds.y = 0;

        if (table.getRowCount() <= 0 || table.getColumnCount() <= 0 ||
                // this check prevents us from painting the entire table
                // when the clip doesn't intersect our bounds at all
                !bounds.intersects(clip)) {

            paintDropLines(context, g);
            return;
        }

        boolean ltr = table.getComponentOrientation().isLeftToRight();

        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 (as long as our bounds intersect the clip,
        // which is why we bail above if that is the case).
        if (rMin == -1) {
            rMin = 0;
        }
        // If the table does not have enough rows to fill the view we'll get -1.
        // (We could also get -1 if our bounds don't intersect the clip,
        // which is why we bail above if that is the case).
        // Replace this with the index of the last row.
        if (rMax == -1) {
            rMax = table.getRowCount()-1;
        }

        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 cells.
        paintCells(context, g, rMin, rMax, cMin, cMax);

        // Paint the grid.
        // it is important to paint the grid after the cells, otherwise the grid will be overpainted
        // because in Synth cell renderers are likely to be opaque
        paintGrid(context, g, rMin, rMax, cMin, cMax);

        paintDropLines(context, g);
    }

    private void paintDropLines(SynthContext context, Graphics g) {
        JTable.DropLocation loc = table.getDropLocation();
        if (loc == null) {
            return;
        }

        Color color = (Color)style.get(context, "Table.dropLineColor");
        Color shortColor = (Color)style.get(context, "Table.dropLineShortColor");
        if (color == null && shortColor == null) {
            return;
        }

        Rectangle rect;

        rect = getHDropLineRect(loc);
        if (rect != null) {
            int x = rect.x;
            int w = rect.width;
            if (color != null) {
                extendRect(rect, true);
                g.setColor(color);
                g.fillRect(rect.x, rect.y, rect.width, rect.height);
            }
            if (!loc.isInsertColumn() && shortColor != null) {
                g.setColor(shortColor);
                g.fillRect(x, rect.y, w, rect.height);
            }
        }

        rect = getVDropLineRect(loc);
        if (rect != null) {
            int y = rect.y;
            int h = rect.height;
            if (color != null) {
                extendRect(rect, false);
                g.setColor(color);
                g.fillRect(rect.x, rect.y, rect.width, rect.height);
            }
            if (!loc.isInsertRow() && shortColor != null) {
                g.setColor(shortColor);
                g.fillRect(rect.x, y, rect.width, h);
            }
        }
    }

    private Rectangle getHDropLineRect(JTable.DropLocation loc) {
        if (!loc.isInsertRow()) {
            return null;
        }

        int row = loc.getRow();
        int col = loc.getColumn();
        if (col >= table.getColumnCount()) {
            col--;
        }

        Rectangle rect = table.getCellRect(row, col, true);

        if (row >= table.getRowCount()) {
            row--;
            Rectangle prevRect = table.getCellRect(row, col, true);
            rect.y = prevRect.y + prevRect.height;
        }

        if (rect.y == 0) {
            rect.y = -1;
        } else {
            rect.y -= 2;
        }

        rect.height = 3;

        return rect;
    }

    private Rectangle getVDropLineRect(JTable.DropLocation loc) {
        if (!loc.isInsertColumn()) {
            return null;
        }

        boolean ltr = table.getComponentOrientation().isLeftToRight();
        int col = loc.getColumn();
        Rectangle rect = table.getCellRect(loc.getRow(), col, true);

        if (col >= table.getColumnCount()) {
            col--;
            rect = table.getCellRect(loc.getRow(), col, true);
            if (ltr) {
                rect.x = rect.x + rect.width;
            }
        } else if (!ltr) {
            rect.x = rect.x + rect.width;
        }

        if (rect.x == 0) {
            rect.x = -1;
        } else {
            rect.x -= 2;
        }

        rect.width = 3;

        return rect;
    }

    private Rectangle extendRect(Rectangle rect, boolean horizontal) {
        if (rect == null) {
            return rect;
        }

        if (horizontal) {
            rect.x = 0;
            rect.width = table.getWidth();
        } else {
            rect.y = 0;

            if (table.getRowCount() != 0) {
                Rectangle lastRect = table.getCellRect(table.getRowCount() - 1, 0, true);
                rect.height = lastRect.y + lastRect.height;
            } else {
                rect.height = table.getHeight();
            }
        }

        return rect;
    }

    /*
     * 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(SynthContext context, 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 );
        SynthGraphicsUtils synthG = context.getStyle().getGraphicsUtils(
                     context);

        if (table.getShowHorizontalLines()) {
            int tableWidth = damagedArea.x + damagedArea.width;
            int y = damagedArea.y;
            for (int row = rMin; row <= rMax; row++) {
                y += table.getRowHeight(row);
                synthG.drawLine(context, "Table.grid",
                                g, 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;
                    synthG.drawLine(context, "Table.grid", g, x - 1, 0,
                                    x - 1, tableHeight - 1);
                }
            } else {
                x = damagedArea.x;
                for (int column = cMax; column >= cMin; column--) {
                    int w = cm.getColumn(column).getWidth();
                    x += w;
                    synthG.drawLine(context, "Table.grid", g, x - 1, 0, x - 1,
                                    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(SynthContext context, 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(context, 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(context, 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(context, g, cellRect, row, column);
                    }
                }
            }
        }

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

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

    private void paintDraggedArea(SynthContext context, 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(context.getStyle().getColor(context, ColorType.BACKGROUND));
        g.fillRect(vacatedColumnRect.x, vacatedColumnRect.y,
                   vacatedColumnRect.width, vacatedColumnRect.height);

        SynthGraphicsUtils synthG = context.getStyle().getGraphicsUtils(
                                            context);


        // 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
            synthG.drawLine(context, "Table.grid", g, x1-1, y1, x1-1, y2);
            // Right
            synthG.drawLine(context, "Table.grid", g, 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(context, 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;
                synthG.drawLine(context, "Table.grid", g, x1, y2, x2, y2);
            }
        }
    }

    private void paintCell(SynthContext context, 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);
            Color b = component.getBackground();
            if ((b == null || b instanceof UIResource
                    || component instanceof SynthBooleanTableCellRenderer)
                    && !table.isCellSelected(row, column)) {
                if (alternateColor != null && row % 2 != 0) {
                    component.setBackground(alternateColor);
                }
            }
            rendererPane.paintComponent(g, component, table, cellRect.x,
                    cellRect.y, cellRect.width, cellRect.height, true);
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void propertyChange(PropertyChangeEvent event) {
        if (SynthLookAndFeel.shouldUpdateStyle(event)) {
            updateStyle((JTable)event.getSource());
        }
    }


    private class SynthBooleanTableCellRenderer extends JCheckBox implements
                      TableCellRenderer {
        private boolean isRowSelected;

        public SynthBooleanTableCellRenderer() {
            setHorizontalAlignment(JLabel.CENTER);
            setName("Table.cellRenderer");
        }

        public Component getTableCellRendererComponent(
                            JTable table, Object value, boolean isSelected,
                            boolean hasFocus, int row, int column) {
            isRowSelected = isSelected;

            if (isSelected) {
                setForeground(unwrap(table.getSelectionForeground()));
                setBackground(unwrap(table.getSelectionBackground()));
            } else {
                setForeground(unwrap(table.getForeground()));
                setBackground(unwrap(table.getBackground()));
            }

            setSelected((value != null && ((Boolean)value).booleanValue()));
            return this;
        }

        private Color unwrap(Color c) {
            if (c instanceof UIResource) {
                return new Color(c.getRGB());
            }
            return c;
        }

        public boolean isOpaque() {
            return isRowSelected ? true : super.isOpaque();
        }
    }

    private class SynthTableCellRenderer extends DefaultTableCellRenderer {
        private Object numberFormat;
        private Object dateFormat;
        private boolean opaque;


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