/*
 * java-gnome, a UI library for writing GTK and GNOME programs from Java!
 *
 * Copyright © 2007-2010 Operational Dynamics Consulting, Pty Ltd and Others
 *
 * The code in this file, and the program it is a part of, is made available
 * to you by its authors as open source software: you can redistribute it
 * and/or modify it under the terms of the GNU General Public License version
 * 2 ("GPL") as published by the Free Software Foundation.
 *
 * This program 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 GPL for more details.
 *
 * You should have received a copy of the GPL along with this program. If not,
 * see http://www.gnu.org/licenses/. The authors of this program may be
 * contacted through http://java-gnome.sourceforge.net/.
 *
 * Linking this library statically or dynamically with other modules is making
 * a combined work based on this library. Thus, the terms and conditions of
 * the GPL cover the whole combination. As a special exception (the
 * "Claspath Exception"), the copyright holders of this library give you
 * permission to link this library with independent modules to produce an
 * executable, regardless of the license terms of these independent modules,
 * and to copy and distribute the resulting executable under terms of your
 * choice, provided that you also meet, for each linked independent module,
 * the terms and conditions of the license of that module. An independent
 * module is a module which is not derived from or based on this library. If
 * you modify this library, you may extend the Classpath Exception to your
 * version of the library, but you are not obligated to do so. If you do not
 * wish to do so, delete this exception statement from your version.
 */
package org.gnome.gtk;

import org.gnome.pango.Alignment;
import org.gnome.pango.EllipsizeMode;

/**
 * Render textual data into a TreeViewColumn. This is the most commonly used
 * CellRenderer, used to present Strings. The fundamental mapping method is
 * {@link #setText(DataColumnString) setText()} which you use to indicate the
 * particular DataColumnString from the underlying TreeModel which will
 * provide the Strings.
 * 
 * <p>
 * CellRendererTexts are also frequently used to present numerical data when
 * it is desired to apply formatting to that data (converting it to a String
 * in the process) before rendering it. If you do that, you'll probably want
 * to use a second (numerically typed) DataColumn to indicate the appropriate
 * sorting order to be applied if that TreeViewColumn is clicked and sorting
 * is turned on for it; see {@link TreeViewColumn#setSortColumn(DataColumn)
 * setSortColumn()}.
 * 
 * @author Andrew Cowie
 * @since 4.0.5
 */
public class CellRendererText extends CellRenderer
{
    /*
     * protected <init>(long) constructor removed deliberately, replaced with
     * this one. TODO mmm, we should test if add an expand parameter!
     */
    protected CellRendererText(long pointer, CellLayout vertical) {
        super(pointer, vertical, true);
    }

    /**
     * Construct a new CellRendererText. Specify the TreeViewColumn it will
     * belong to and from whose parent TreeView has the TreeModel where the
     * columns of data will come from.
     * 
     * @since 4.0.5
     */
    public CellRendererText(CellLayout vertical) {
        super(GtkCellRendererText.createCellRendererText(), vertical, true);
    }

    /**
     * Indicate the DataColumn containing the plain text to render. This will
     * map the DataColumn that will be used to provide the text to be rendered
     * in the TreeViewColumn this CellRenderer is packed into. This is by far
     * and away the most commonly used mapping in the entire TreeView API.
     * 
     * <p>
     * If you want to use Pango markup to format the text being rendered, call
     * {@link #setMarkup(DataColumnString) setMarkup()} instead.
     * 
     * @since 4.0.5
     */
    public void setText(DataColumnString column) {
        GtkCellLayout.addAttribute(vertical, this, "text", column.getOrdinal());
    }

    /**
     * Indicate the DataColumn containing Pango markup to render as text.
     * 
     * <p>
     * The String in the DataColumn being rendered will be interpreted as
     * containing markup in Pango's text markup language. Using this allows
     * you to make very expressive presentations within TreeView cells.
     * 
     * <p>
     * Using this (instead of {@link #setText(DataColumnString) setText()})
     * has the same effect as using a Label with
     * {@link Label#setUseMarkup(boolean) setUseMarkup(true)} in normal
     * layouts.
     * 
     * @since 4.0.5
     */
    public void setMarkup(DataColumnString column) {
        GtkCellLayout.addAttribute(vertical, this, "markup", column.getOrdinal());
    }

    /**
     * Indicate the DataColumn containing the name of the foreground colour to
     * used when rendering text.
     * 
     * @since 4.0.5
     */
    public void setForeground(DataColumnString column) {
        GtkCellLayout.addAttribute(vertical, this, "foreground", column.getOrdinal());
    }

    /**
     * Indicate if the contents rendered by this CellRenderer should be
     * editable. This affects all rows rendered by this CellRenderer.
     * 
     * @since 4.0.8
     */
    public void setEditable(boolean editable) {
        setPropertyBoolean("editable", editable);
    }

    /**
     * Indicate the DataColumn containing the information whether the cell
     * should be editable or not.
     * 
     * @since 4.0.9
     */
    public void setEditable(DataColumnBoolean column) {
        GtkCellLayout.addAttribute(vertical, this, "editable", column.getOrdinal());
    }

    /**
     * Set the {@link EllipsizeMode ellipsization mode} to use to make the
     * text fits the cell width.
     * 
     * @since 4.0.17
     */
    public void setEllipsize(EllipsizeMode setting) {
        setPropertyEnum("ellipsize", setting);
    }

    /**
     * Get the current ellipsization used.
     * 
     * @since 4.0.17
     */
    public EllipsizeMode getEllipsizeMode() {
        return (EllipsizeMode) getPropertyEnum("ellipsize");
    }

    /**
     * Set the Alignment used when multiple lines of text appear <i>within</i>
     * the cell. This is specific to CellRendererText; for the position of any
     * CellRenderer within its enclosing TreeViewColumn, see CellRenderer's
     * {@link CellRenderer#setAlignment(float, float) setAlignment()}.
     * 
     * @since 4.0.20
     */
    public void setAlignment(Alignment align) {
        setPropertyEnum("alignment", align);
    }

    /**
     * Event generated after user activated a cell, changed its content and
     * pressed Return.
     * 
     * <p>
     * Note that the act of editing the cell in the TreeView does <b>not</b>
     * cause a change in the underlying model. In the usual case (where a
     * given TreeModel is only being used as the backing store for the
     * TreeView) then you'll want to update it:
     * 
     * <pre>
     * renderer.connect(new CellRendererText.Edited() {
     *     public void onEdited(CellRendererText source, TreePath path, String text) {
     *         model.setValue(model.getIter(path), column, text); 
     *     }
     * }
     * </pre>
     * 
     * assuming you have access to the TreeModel and DataColumn variables.
     * 
     * @author Stefan Prelle
     * @author Andrew Cowie
     * @since 4.0.8
     */
    public interface Edited
    {
        public void onEdited(CellRendererText source, TreePath path, String text);
    }

    /**
     * Hook up a handler to receive "edited" events on this CellRenderer. A
     * typical example of how this is used is as follows:
     * 
     * <pre>
     * final DataColumnString column;
     * final TreeView view;
     * final ListStore store;
     * final TreeViewColumn visibleColumn 
     * 
     * store = new ListStore(new DataColumn[]{
     *          column = new DataColumnString()
     * });
     *      
     * view = new TreeView(store);
     * visibleColumn = view.appendColumn();
     * CellRendererText renderer = new CellRendererText(visibleColumn);
     * renderer.setText(column);
     * renderer.setEditable(true);
     * renderer.connect(new CellRendererText.Edited(){
     *      public void onEdited(CellRendererText source, TreePath path, String text) {
     *          System.out.println(&quot;New value for path &quot; + path + &quot; is &quot; + text);
     *          TreeIter row = store.getIter(path);
     *          store.setValue(row, column, text);
     *      }});
     * </pre>
     * 
     * @since 4.0.8
     */
    public void connect(CellRendererText.Edited handler) {
        GtkCellRendererText.connect(this, new EditedHandler(handler), false);
    }

    /*
     * Helper class to convert second parameter from String to TreePath
     */
    private static class EditedHandler implements GtkCellRendererText.EditedSignal
    {
        private CellRendererText.Edited handler;

        private EditedHandler(CellRendererText.Edited handler) {
            this.handler = handler;
        }

        public void onEdited(CellRendererText source, String path, String text) {
            handler.onEdited(source, new TreePath(path), text);
        }
    }
}
