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/*
 * Copyright 2008-2012 Sergey Skladchikov
 *
 * 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 org.gwt.advanced.client.ui.widget.cell;

import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.ui.Widget;
import org.gwt.advanced.client.datamodel.TreeGridRow;

/**
 * This is a tree cell implementation that renders an expand / collapse image and makes indents.
 *
 * @author Sergey Skladchikov
 * @since 1.4.0
 */
public class TreeCell extends ExpandableCellImpl implements ExpandableCell {
    /** indent value in pixels */
    public static final int INDENT = 10;
    /** gridRow gridRow */
    private TreeGridRow gridRow;
    /** subtree pager widget */
    private Widget pager;

    /** {@inheritDoc} */
    protected void createImage() {
        super.createImage();

        if (!isLeaf()) {
            Element image = getImage().getElement();
            DOM.setElementAttribute(image, "class", "indent-cell");
            DOM.setStyleAttribute(image, "marginLeft", getGridRow().getLevel() * INDENT + "px");
        } else {
            Element text = ((Widget) getValue()).getElement();
            DOM.setStyleAttribute(text, "marginLeft", (getGridRow().getLevel() * INDENT + 9) + "px");
        }
    }

    /** {@inheritDoc} */
    public TreeGridRow getGridRow() {
        return gridRow;
    }

    /**
     * Setter for property 'gridRow'.
     *
     * @param gridRow Value to set for property 'gridRow'.
     */
    public void setGridRow(TreeGridRow gridRow) {
        this.gridRow = gridRow;
    }

    /**
     * This method adds a pager widget into the cell.
     *
     * @param widget is a pager widget.
     */
    public void putPager(Widget widget) {
        if (widget != null) {
            getPanel().add(widget);
            getPanel().setCellWidth(widget, "1%");
            getPanel().setCellWidth((Widget) getValue(), "98%");
            this.pager = widget;
        }
    }

    /**
     * This method removes a pager.
     */
    public void removePager() {
        if (this.pager != null) {
            getPanel().remove(this.pager);
            this.pager = null;
        }
    }
}