/*******************************************************************************
 * Copyright (c) 2010 Haifeng Li
 *   
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *  
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/

package smile.swing.table;

import java.awt.Color;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.AbstractCellEditor;
import javax.swing.Action;
import javax.swing.Icon;
import javax.swing.JButton;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.border.Border;
import javax.swing.border.LineBorder;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumnModel;



/**
 * The ButtonCellRenderer class provides a renderer and an editor that looks
 * like a JButton. The renderer and editor will then be used for a specified
 * column in the table. The TableModel will contain the String to be displayed
 * on the button.
 *
 * The button can be invoked by a mouse click or by pressing the space bar
 * when the cell has focus. Optionally a mnemonic can be set to invoke the
 * button. When the button is invoked the provided Action is invoked. The
 * source of the Action will be the table. The action command will contain
 * the model row number of the button that was clicked.
 *
 * @author Haifeng Li
 */
@SuppressWarnings("serial")
public class ButtonCellRenderer extends AbstractCellEditor
	implements TableCellRenderer, TableCellEditor, ActionListener, MouseListener
{
    private JTable table;
    private transient Action action;
    private int mnemonic;
    private Border originalBorder;
    private Border focusBorder;
    private JButton renderButton;
    private JButton editButton;
    private Object editorValue;
    private boolean isButtonColumnEditor;

    /**
     * Create the ButtonCellRenderer to be used as a renderer and editor. The
     * renderer and editor will automatically be installed on the TableColumn of
     * the specified column.
     *
     * @param table the table containing the button renderer/editor
     * @param action the Action to be invoked when the button is invoked
     * @param column the column to which the button renderer/editor is added
     */
    public ButtonCellRenderer(JTable table, Action action, int column) {
        this.table = table;
        this.action = action;

        renderButton = new JButton();
        editButton = new JButton();
        editButton.setFocusPainted(false);
        editButton.addActionListener(this);
        originalBorder = editButton.getBorder();
        setFocusBorder(new LineBorder(Color.BLUE));

        TableColumnModel columnModel = table.getColumnModel();
        columnModel.getColumn(column).setCellRenderer(this);
        columnModel.getColumn(column).setCellEditor(this);
        table.addMouseListener(this);
    }

    /**
     * Get foreground color of the button when the cell has focus
     *
     * @return the foreground color
     */
    public Border getFocusBorder() {
        return focusBorder;
    }

    /**
     * The foreground color of the button when the cell has focus
     *
     * @param focusBorder the foreground color
     */
    public void setFocusBorder(Border focusBorder) {
        this.focusBorder = focusBorder;
        editButton.setBorder(focusBorder);
    }

    public int getMnemonic() {
        return mnemonic;
    }

    /**
     * The mnemonic to activate the button when the cell has focus
     *
     * @param mnemonic the mnemonic
     */
    public void setMnemonic(int mnemonic) {
        this.mnemonic = mnemonic;
        renderButton.setMnemonic(mnemonic);
        editButton.setMnemonic(mnemonic);
    }

    @Override
    public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
        if (value == null) {
            editButton.setText("");
            editButton.setIcon(null);
            editButton.setEnabled(true);
        } else if (value instanceof Icon) {
            editButton.setText("");
            editButton.setIcon((Icon) value);
            editButton.setEnabled(true);
        } else {
            editButton.setText(value.toString());
            editButton.setIcon(null);
            editButton.setEnabled(true);
        }

        this.editorValue = value;
        return editButton;
    }

    @Override
    public Object getCellEditorValue() {
        return editorValue;
    }

    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        if (isSelected) {
            renderButton.setForeground(table.getSelectionForeground());
            renderButton.setBackground(table.getSelectionBackground());
        } else {
            renderButton.setForeground(table.getForeground());
            renderButton.setBackground(UIManager.getColor("Button.background"));
        }

        if (hasFocus) {
            renderButton.setBorder(focusBorder);
        } else {
            renderButton.setBorder(originalBorder);
        }

        if (value == null) {
            renderButton.setText("");
            renderButton.setIcon(null);
            renderButton.setEnabled(false);
        } else if (value instanceof Icon) {
            renderButton.setText("");
            renderButton.setIcon((Icon) value);
            renderButton.setEnabled(true);
        } else {
            renderButton.setText(value.toString());
            renderButton.setIcon(null);
            renderButton.setEnabled(true);
        }

        return renderButton;
    }

    /*
     *	The button has been pressed. Stop editing and invoke the custom Action
     */
    @Override
    public void actionPerformed(ActionEvent e) {
        int row = table.convertRowIndexToModel(table.getEditingRow());
        fireEditingStopped();

        //  Invoke the Action
        ActionEvent event = new ActionEvent(
                table,
                ActionEvent.ACTION_PERFORMED,
                Integer.toString(row));
        action.actionPerformed(event);
    }

    /*
     *  When the mouse is pressed the editor is invoked. If you then then drag
     *  the mouse to another cell before releasing it, the editor is still
     *  active. Make sure editing is stopped when the mouse is released.
     */
    @Override
    public void mousePressed(MouseEvent e) {
        if (table.isEditing() && table.getCellEditor() == this) {
            isButtonColumnEditor = true;
        }
    }

    @Override
    public void mouseReleased(MouseEvent e) {
        if (isButtonColumnEditor && table.isEditing()) {
            table.getCellEditor().stopCellEditing();
        }

        isButtonColumnEditor = false;
    }

    @Override
    public void mouseClicked(MouseEvent e) {
    }

    @Override
    public void mouseEntered(MouseEvent e) {
    }

    @Override
    public void mouseExited(MouseEvent e) {
    }
}