/*
 * Ext GWT 2.2.4 - Ext for GWT
 * Copyright(c) 2007-2010, Ext JS, LLC.
 * licensing@extjs.com
 * 
 * http://extjs.com/license
 */
package com.extjs.gxt.ui.client.widget.treegrid;

import com.extjs.gxt.ui.client.data.ModelData;
import com.extjs.gxt.ui.client.store.ListStore;
import com.extjs.gxt.ui.client.store.TreeStore;
import com.extjs.gxt.ui.client.widget.grid.ColumnData;
import com.extjs.gxt.ui.client.widget.grid.Grid;
import com.extjs.gxt.ui.client.widget.grid.GridCellRenderer;
import com.extjs.gxt.ui.client.widget.treepanel.TreePanel.Joint;
import com.google.gwt.user.client.ui.AbstractImagePrototype;

/**
 * A <code>GridCellRenderer</code> that renders a tree into it's column.
 * Renderer may be used in any column, not just the first.
 */
public class TreeGridCellRenderer<M extends ModelData> implements GridCellRenderer<M> {

  @SuppressWarnings({"unchecked", "rawtypes"})
  public Object render(M model, String property, ColumnData config, int rowIndex, int colIndex, ListStore<M> store,
      Grid<M> grid) {
    config.css = "x-treegrid-column";

    assert grid instanceof TreeGrid : "TreeGridCellRenderer can only be used in a TreeGrid";

    TreeGrid tree = (TreeGrid) grid;
    TreeStore ts = tree.getTreeStore();

    int level = ts.getDepth(model);

    String id = getId(tree, model, property, rowIndex, colIndex);
    String text = getText(tree, model, property, rowIndex, colIndex);
    AbstractImagePrototype icon = calculateIconStyle(tree, model, property, rowIndex, colIndex);
    Joint j = calcualteJoint(tree, model, property, rowIndex, colIndex);

    return tree.getTreeView().getTemplate(model, id, text, icon, false, j, level - 1);
  }

  protected Joint calcualteJoint(TreeGrid<M> grid, M model, String property, int rowIndex, int colIndex) {
    return grid.calcualteJoint(model);
  }

  protected AbstractImagePrototype calculateIconStyle(TreeGrid<M> grid, M model, String property, int rowIndex,
      int colIndex) {
    return grid.calculateIconStyle(model);
  }

  protected String getId(TreeGrid<M> grid, M model, String property, int rowIndex, int colIndex) {
    return grid.findNode(model).id;
  }

  protected String getText(TreeGrid<M> grid, M model, String property, int rowIndex, int colIndex) {
    return String.valueOf(model.get(property));
  }
}