/*

 * Copyright (c) 1997, 2014, 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.basic;

import java.awt.*;

import java.awt.datatransfer.*;

import java.awt.dnd.*;

import java.awt.event.*;

import java.util.Enumeration;

import java.util.EventObject;

import java.util.Hashtable;

import java.util.TooManyListenersException;

import javax.swing.*;

import javax.swing.event.*;

import javax.swing.plaf.*;

import javax.swing.text.*;

import javax.swing.table.*;

import javax.swing.plaf.basic.DragRecognitionSupport.BeforeDrag;

import sun.swing.SwingUtilities2;

import java.beans.PropertyChangeEvent;

import java.beans.PropertyChangeListener;

import sun.swing.DefaultLookup;

import sun.swing.UIAction;

/**

 * BasicTableUI implementation

 *

 * @author Philip Milne

 * @author Shannon Hickey (drag and drop)

 */

public class BasicTableUI extends TableUI

{

    private static final StringBuilder BASELINE_COMPONENT_KEY =

        new StringBuilder("Table.baselineComponent");

//

// Instance Variables

//

    // The JTable that is delegating the painting to this UI.

    /**

     * The instance of {@code JTable}.

     */

    protected JTable table;

    /**

     * The instance of {@code CellRendererPane}.

     */

    protected CellRendererPane rendererPane;

    /**

     * {@code KeyListener} that are attached to the {@code JTable}.

     */

    protected KeyListener keyListener;

    /**

     * {@code FocusListener} that are attached to the {@code JTable}.

     */

    protected FocusListener focusListener;

    /**

     * {@code MouseInputListener} that are attached to the {@code JTable}.

     */

    protected MouseInputListener mouseInputListener;

    private Handler handler;

    /**

     * Local cache of Table's client property "Table.isFileList"

     */

    private boolean isFileList = false;

//

//  Helper class for keyboard actions

//

    private static class Actions extends UIAction {

        private static final String CANCEL_EDITING = "cancel";

        private static final String SELECT_ALL = "selectAll";

        private static final String CLEAR_SELECTION = "clearSelection";

        private static final String START_EDITING = "startEditing";

        private static final String NEXT_ROW = "selectNextRow";

        private static final String NEXT_ROW_CELL = "selectNextRowCell";

        private static final String NEXT_ROW_EXTEND_SELECTION =

                "selectNextRowExtendSelection";

        private static final String NEXT_ROW_CHANGE_LEAD =

                "selectNextRowChangeLead";

        private static final String PREVIOUS_ROW = "selectPreviousRow";

        private static final String PREVIOUS_ROW_CELL = "selectPreviousRowCell";

        private static final String PREVIOUS_ROW_EXTEND_SELECTION =

                "selectPreviousRowExtendSelection";

        private static final String PREVIOUS_ROW_CHANGE_LEAD =

                "selectPreviousRowChangeLead";

        private static final String NEXT_COLUMN = "selectNextColumn";

        private static final String NEXT_COLUMN_CELL = "selectNextColumnCell";

        private static final String NEXT_COLUMN_EXTEND_SELECTION =

                "selectNextColumnExtendSelection";

        private static final String NEXT_COLUMN_CHANGE_LEAD =

                "selectNextColumnChangeLead";

        private static final String PREVIOUS_COLUMN = "selectPreviousColumn";

        private static final String PREVIOUS_COLUMN_CELL =

                "selectPreviousColumnCell";

        private static final String PREVIOUS_COLUMN_EXTEND_SELECTION =

                "selectPreviousColumnExtendSelection";

        private static final String PREVIOUS_COLUMN_CHANGE_LEAD =

                "selectPreviousColumnChangeLead";

        private static final String SCROLL_LEFT_CHANGE_SELECTION =

                "scrollLeftChangeSelection";

        private static final String SCROLL_LEFT_EXTEND_SELECTION =

                "scrollLeftExtendSelection";

        private static final String SCROLL_RIGHT_CHANGE_SELECTION =

                "scrollRightChangeSelection";

        private static final String SCROLL_RIGHT_EXTEND_SELECTION =

                "scrollRightExtendSelection";

        private static final String SCROLL_UP_CHANGE_SELECTION =

                "scrollUpChangeSelection";

        private static final String SCROLL_UP_EXTEND_SELECTION =

                "scrollUpExtendSelection";

        private static final String SCROLL_DOWN_CHANGE_SELECTION =

                "scrollDownChangeSelection";

        private static final String SCROLL_DOWN_EXTEND_SELECTION =

                "scrollDownExtendSelection";

        private static final String FIRST_COLUMN =

                "selectFirstColumn";

        private static final String FIRST_COLUMN_EXTEND_SELECTION =

                "selectFirstColumnExtendSelection";

        private static final String LAST_COLUMN =

                "selectLastColumn";

        private static final String LAST_COLUMN_EXTEND_SELECTION =

                "selectLastColumnExtendSelection";

        private static final String FIRST_ROW =

                "selectFirstRow";

        private static final String FIRST_ROW_EXTEND_SELECTION =

                "selectFirstRowExtendSelection";

        private static final String LAST_ROW =

                "selectLastRow";

        private static final String LAST_ROW_EXTEND_SELECTION =

                "selectLastRowExtendSelection";

        // add the lead item to the selection without changing lead or anchor

        private static final String ADD_TO_SELECTION = "addToSelection";

        // toggle the selected state of the lead item and move the anchor to it

        private static final String TOGGLE_AND_ANCHOR = "toggleAndAnchor";

        // extend the selection to the lead item

        private static final String EXTEND_TO = "extendTo";

        // move the anchor to the lead and ensure only that item is selected

        private static final String MOVE_SELECTION_TO = "moveSelectionTo";

        // give focus to the JTableHeader, if one exists

        private static final String FOCUS_HEADER = "focusHeader";

        protected int dx;

        protected int dy;

        protected boolean extend;

        protected boolean inSelection;

        // horizontally, forwards always means right,

        // regardless of component orientation

        protected boolean forwards;

        protected boolean vertically;

        protected boolean toLimit;

        protected int leadRow;

        protected int leadColumn;

        Actions(String name) {

            super(name);

        }

        Actions(String name, int dx, int dy, boolean extend,

                boolean inSelection) {

            super(name);

            // Actions spcifying true for "inSelection" are

            // fairly sensitive to bad parameter values. They require

            // that one of dx and dy be 0 and the other be -1 or 1.

            // Bogus parameter values could cause an infinite loop.

            // To prevent any problems we massage the params here

            // and complain if we get something we can't deal with.

            if (inSelection) {

                this.inSelection = true;

                // look at the sign of dx and dy only

                dx = sign(dx);

                dy = sign(dy);

                // make sure one is zero, but not both

                assert (dx == 0 || dy == 0) && !(dx == 0 && dy == 0);

            }

            this.dx = dx;

            this.dy = dy;

            this.extend = extend;

        }

        Actions(String name, boolean extend, boolean forwards,

                boolean vertically, boolean toLimit) {

            this(name, 0, 0, extend, false);

            this.forwards = forwards;

            this.vertically = vertically;

            this.toLimit = toLimit;

        }

        private static int clipToRange(int i, int a, int b) {

            return Math.min(Math.max(i, a), b-1);

        }

        private void moveWithinTableRange(JTable table, int dx, int dy) {

            leadRow = clipToRange(leadRow+dy, 0, table.getRowCount());

            leadColumn = clipToRange(leadColumn+dx, 0, table.getColumnCount());

        }

        private static int sign(int num) {

            return (num < 0) ? -1 : ((num == 0) ? 0 : 1);

        }

        /**

         * Called to move within the selected range of the given JTable.

         * This method uses the table's notion of selection, which is

         * important to allow the user to navigate between items visually

         * selected on screen. This notion may or may not be the same as

         * what could be determined by directly querying the selection models.

         * It depends on certain table properties (such as whether or not

         * row or column selection is allowed). When performing modifications,

         * it is recommended that caution be taken in order to preserve

         * the intent of this method, especially when deciding whether to

         * query the selection models or interact with JTable directly.

         */

        private boolean moveWithinSelectedRange(JTable table, int dx, int dy,

                ListSelectionModel rsm, ListSelectionModel csm) {

            // Note: The Actions constructor ensures that only one of

            // dx and dy is 0, and the other is either -1 or 1

            // find out how many items the table is showing as selected

            // and the range of items to navigate through

            int totalCount;

            int minX, maxX, minY, maxY;

            boolean rs = table.getRowSelectionAllowed();

            boolean cs = table.getColumnSelectionAllowed();

            // both column and row selection

            if (rs && cs) {

                totalCount = table.getSelectedRowCount() * table.getSelectedColumnCount();

                minX = csm.getMinSelectionIndex();

                maxX = csm.getMaxSelectionIndex();

                minY = rsm.getMinSelectionIndex();

                maxY = rsm.getMaxSelectionIndex();

            // row selection only

            } else if (rs) {

                totalCount = table.getSelectedRowCount();

                minX = 0;

                maxX = table.getColumnCount() - 1;

                minY = rsm.getMinSelectionIndex();

                maxY = rsm.getMaxSelectionIndex();

            // column selection only

            } else if (cs) {

                totalCount = table.getSelectedColumnCount();

                minX = csm.getMinSelectionIndex();

                maxX = csm.getMaxSelectionIndex();

                minY = 0;

                maxY = table.getRowCount() - 1;

            // no selection allowed

            } else {

                totalCount = 0;

                // A bogus assignment to stop javac from complaining

                // about unitialized values. In this case, these

                // won't even be used.

                minX = maxX = minY = maxY = 0;

            }

            // For some cases, there is no point in trying to stay within the

            // selected area. Instead, move outside the selection, wrapping at

            // the table boundaries. The cases are:

            boolean stayInSelection;

            // - nothing selected

            if (totalCount == 0 ||

                    // - one item selected, and the lead is already selected

                    (totalCount == 1 && table.isCellSelected(leadRow, leadColumn))) {

                stayInSelection = false;

                maxX = table.getColumnCount() - 1;

                maxY = table.getRowCount() - 1;

                // the mins are calculated like this in case the max is -1

                minX = Math.min(0, maxX);

                minY = Math.min(0, maxY);

            } else {

                stayInSelection = true;

            }

            // the algorithm below isn't prepared to deal with -1 lead/anchor

            // so massage appropriately here first

            if (dy == 1 && leadColumn == -1) {

                leadColumn = minX;

                leadRow = -1;

            } else if (dx == 1 && leadRow == -1) {

                leadRow = minY;

                leadColumn = -1;

            } else if (dy == -1 && leadColumn == -1) {

                leadColumn = maxX;

                leadRow = maxY + 1;

            } else if (dx == -1 && leadRow == -1) {

                leadRow = maxY;

                leadColumn = maxX + 1;

            }

            // In cases where the lead is not within the search range,

            // to work properly. Check these here.

            leadRow = Math.min(Math.max(leadRow, minY - 1), maxY + 1);

            leadColumn = Math.min(Math.max(leadColumn, minX - 1), maxX + 1);

            // find the next position, possibly looping until it is selected

            do {

                calcNextPos(dx, minX, maxX, dy, minY, maxY);

            } while (stayInSelection && !table.isCellSelected(leadRow, leadColumn));

            return stayInSelection;

        }

        /**

         * Find the next lead row and column based on the given

         * dx/dy and max/min values.

         */

        private void calcNextPos(int dx, int minX, int maxX,

                                 int dy, int minY, int maxY) {

            if (dx != 0) {

                leadColumn += dx;

                if (leadColumn > maxX) {

                    leadColumn = minX;

                    leadRow++;

                    if (leadRow > maxY) {

                        leadRow = minY;

                    }

                } else if (leadColumn < minX) {

                    leadColumn = maxX;

                    leadRow--;

                    if (leadRow < minY) {

                        leadRow = maxY;

                    }

                }

            } else {

                leadRow += dy;

                if (leadRow > maxY) {

                    leadRow = minY;

                    leadColumn++;

                    if (leadColumn > maxX) {

                        leadColumn = minX;

                    }

                } else if (leadRow < minY) {

                    leadRow = maxY;

                    leadColumn--;

                    if (leadColumn < minX) {

                        leadColumn = maxX;

                    }

                }

            }

        }

        public void actionPerformed(ActionEvent e) {

            String key = getName();

            JTable table = (JTable)e.getSource();

            ListSelectionModel rsm = table.getSelectionModel();

            leadRow = getAdjustedLead(table, true, rsm);

            ListSelectionModel csm = table.getColumnModel().getSelectionModel();

            leadColumn = getAdjustedLead(table, false, csm);

            if (key == SCROLL_LEFT_CHANGE_SELECTION ||        // Paging Actions

                    key == SCROLL_LEFT_EXTEND_SELECTION ||

                    key == SCROLL_RIGHT_CHANGE_SELECTION ||

                    key == SCROLL_RIGHT_EXTEND_SELECTION ||

                    key == SCROLL_UP_CHANGE_SELECTION ||

                    key == SCROLL_UP_EXTEND_SELECTION ||

                    key == SCROLL_DOWN_CHANGE_SELECTION ||

                    key == SCROLL_DOWN_EXTEND_SELECTION ||

                    key == FIRST_COLUMN ||

                    key == FIRST_COLUMN_EXTEND_SELECTION ||

                    key == FIRST_ROW ||

                    key == FIRST_ROW_EXTEND_SELECTION ||

                    key == LAST_COLUMN ||

                    key == LAST_COLUMN_EXTEND_SELECTION ||

                    key == LAST_ROW ||

                    key == LAST_ROW_EXTEND_SELECTION) {

                if (toLimit) {

                    if (vertically) {

                        int rowCount = table.getRowCount();

                        this.dx = 0;

                        this.dy = forwards ? rowCount : -rowCount;

                    }

                    else {

                        int colCount = table.getColumnCount();

                        this.dx = forwards ? colCount : -colCount;

                        this.dy = 0;

                    }

                }

                else {

                    if (!(SwingUtilities.getUnwrappedParent(table).getParent() instanceof

                            JScrollPane)) {

                        return;

                    }

                    Dimension delta = table.getParent().getSize();

                    if (vertically) {

                        Rectangle r = table.getCellRect(leadRow, 0, true);

                        if (forwards) {

                            // scroll by at least one cell

                            r.y += Math.max(delta.height, r.height);

                        } else {

                            r.y -= delta.height;

                        }

                        this.dx = 0;

                        int newRow = table.rowAtPoint(r.getLocation());

                        if (newRow == -1 && forwards) {

                            newRow = table.getRowCount();

                        }

                        this.dy = newRow - leadRow;

                    }

                    else {

                        Rectangle r = table.getCellRect(0, leadColumn, true);

                        if (forwards) {

                            // scroll by at least one cell

                            r.x += Math.max(delta.width, r.width);

                        } else {

                            r.x -= delta.width;

                        }

                        int newColumn = table.columnAtPoint(r.getLocation());

                        if (newColumn == -1) {

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

                            newColumn = forwards ? (ltr ? table.getColumnCount() : 0)

                                                 : (ltr ? 0 : table.getColumnCount());

                        }

                        this.dx = newColumn - leadColumn;

                        this.dy = 0;

                    }

                }

            }

            if (key == NEXT_ROW ||  // Navigate Actions

                    key == NEXT_ROW_CELL ||

                    key == NEXT_ROW_EXTEND_SELECTION ||

                    key == NEXT_ROW_CHANGE_LEAD ||

                    key == NEXT_COLUMN ||

                    key == NEXT_COLUMN_CELL ||

                    key == NEXT_COLUMN_EXTEND_SELECTION ||

                    key == NEXT_COLUMN_CHANGE_LEAD ||

                    key == PREVIOUS_ROW ||

                    key == PREVIOUS_ROW_CELL ||

                    key == PREVIOUS_ROW_EXTEND_SELECTION ||

                    key == PREVIOUS_ROW_CHANGE_LEAD ||

                    key == PREVIOUS_COLUMN ||

                    key == PREVIOUS_COLUMN_CELL ||

                    key == PREVIOUS_COLUMN_EXTEND_SELECTION ||

                    key == PREVIOUS_COLUMN_CHANGE_LEAD ||

                    // Paging Actions.

                    key == SCROLL_LEFT_CHANGE_SELECTION ||

                    key == SCROLL_LEFT_EXTEND_SELECTION ||

                    key == SCROLL_RIGHT_CHANGE_SELECTION ||

                    key == SCROLL_RIGHT_EXTEND_SELECTION ||

                    key == SCROLL_UP_CHANGE_SELECTION ||

                    key == SCROLL_UP_EXTEND_SELECTION ||

                    key == SCROLL_DOWN_CHANGE_SELECTION ||

                    key == SCROLL_DOWN_EXTEND_SELECTION ||

                    key == FIRST_COLUMN ||

                    key == FIRST_COLUMN_EXTEND_SELECTION ||

                    key == FIRST_ROW ||

                    key == FIRST_ROW_EXTEND_SELECTION ||

                    key == LAST_COLUMN ||

                    key == LAST_COLUMN_EXTEND_SELECTION ||

                    key == LAST_ROW ||

                    key == LAST_ROW_EXTEND_SELECTION) {

                if (table.isEditing() &&

                        !table.getCellEditor().stopCellEditing()) {

                    return;

                }

                // Unfortunately, this strategy introduces bugs because

                // of the asynchronous nature of requestFocus() call below.