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// This may look like C code, but it's really -*- C++ -*-
/*
 * Copyright (C) 2008 Emweb bvba, Kessel-Lo, Belgium.
 *
 * See the LICENSE file for terms of use.
 */
#ifndef WTREETABLE_H_
#define WTREETABLE_H_

#include <Wt/WCompositeWidget>

namespace Wt {

class WTree;
class WTreeTableNode;
class WText;

/*! \class WTreeTable Wt/WTreeTable Wt/WTreeTable
 *  \brief A table with a navigatable tree in the first column.
 *
 * A %WTreeTable implements a tree table, where additional data
 * associated is associated with tree items, which are organized in
 * columns.
 *
 * Unlike the MVC-based WTreeView widget, the tree renders a widget
 * hierarchy, rather than a hierarhical standard model. This provides
 * extra flexibility (as any widget can be used as contents), at the
 * cost of server-side, client-side and bandwidth resources
 * (especially for large tree tables).
 *
 * The actual data is organized and provided by WTreeTableNode widgets.
 *
 * To use the tree table, you need <b>first</b> to call addColumn() to
 * specify the additional data columns. Next, you need to set the tree
 * root using setTreeRoot() and bind additional information (text or
 * other widgets) in each node using
 * WTreeTableNode::setColumnWidget(). Thus, you cannot change the
 * number of columns once the tree root has been set.
 *
 * The table cannot be given a height using CSS style rules, instead you
 * must use layout managers, or use resize().
 *
 * \if cpp
 * Usage example:
 * \code
 * Wt::WTreeTable *treeTable = new Wt::WTreeTable();
 * treeTable->resize(650, 300);
 *
 * // Add 3 extra columns
 * treeTable->addColumn("Yuppie Factor", 125);
 * treeTable->addColumn("# Holidays", 125);
 * treeTable->addColumn("Favorite Item", 125);
 *
 * // Create and set the root node
 * Wt::WTreeTableNode *root = new Wt::WTreeTableNode("All Personnel");
 * root->setImagePack("resources/");
 * treeTable->setTreeRoot(root, "Emweb Organigram");
 *
 * // Populate the tree with data nodes.
 * Wt::WTreeTableNode *node1 = new Wt::WTreeTableNode("Upper Management", 0, root);
 * Wt::WTreeTableNode *node2;
 * node2 = new Wt::WTreeTableNode("Chief Anything Officer", 0, node1);
 * node2->setColumnWidget(1, new Wt::WText("-2.8"));
 * node2->setColumnWidget(2, new Wt::WText("20"));
 * node2->setColumnWidget(3, new Wt::WText("Scepter"));
 *
 * node2 = new WTreeTableNode("Vice President of Parties", 0, node1);
 * node2->setColumnWidget(1, new Wt::WText("13.57"));
 * node2->setColumnWidget(2, new Wt::WText("365"));
 * node2->setColumnWidget(3, new Wt::WText("Flag"));
 *
 * root->expand();
 * \endcode
 * \endif
 *
 * A screenshot of the treetable:
 * \image html WTreeTable-default-1.png "An example WTreeTable (default)"
 * \image html WTreeTable-polished-1.png "An example WTreeTable (polished)"
 *
 * \sa WTreeTableNode, WTreeView
 */
class WT_API WTreeTable : public WCompositeWidget
{
public:
  /*! \brief Creates a new tree table.
   *
   * The treeRoot() is \c 0. The table should first be properly dimensioned
   * using addColumn() calls, and then data using setTreeRoot().
   */
  WTreeTable(WContainerWidget *parent = 0);

  /*! \brief Adds an extra column.
   *
   * Add an extra column, specifying the column header and a column
   * width. The extra columns are numbered from 1 as column 0 contains
   * the tree itself. The header for column 0 (the tree itself) is
   * specified in setTreeRoot(), and the width of column 0 takes the
   * remaining available width.
   */
  void addColumn(const WString& header, const WLength& width);

  /*! \brief Returns the number of columns in this table.
   *
   * Returns the number of columns in the table, including in the count
   * column 0 (which contains the tree).
   *
   * \sa addColumn()
   */
  int columnCount() const { return (int)columnWidths_.size(); }

  /*! \brief Sets the tree root.
   *
   * Sets the data for the tree table, and specify the header for the
   * first column.
   *
   * The initial \p root is \c 0.
   *
   * \sa treeRoot(), setTree()
   */
  void setTreeRoot(WTreeTableNode *root, const WString& header);

  /*! \brief Returns the tree root.
   */
  WTreeTableNode *treeRoot();

  /*! \brief Sets the tree which provides the data for the tree table.
   *
   * \sa setTreeRoot().
   */
  void setTree(WTree *tree, const WString& header);

  /*! \brief Returns the tree that provides the data this table.
   *
   * \sa setTree().
   */
  WTree *tree() const { return tree_; }

  /*! \brief Returns the column width for the given column.
   *
   * The width of the first column (with index 0), containing the
   * tree, is implied by the width set for the table minus the width
   * of all other columns.
   *
   * \sa addColumn(), setTreeRoot()
   */
  WLength columnWidth(int column) const { return columnWidths_[column]; }

  /*! \brief Returns the header for the given column.
   *
   * \sa addColumn(), setTreeRoot()
   */
  WText *header(int column) const;

  /*! \brief Returns the header widget.
   *
   * This is the widget that contains the column headers.
   */
  WWidget *headerWidget() const;

protected:
  virtual void render(WFlags<RenderFlag> flags);

private:
  WContainerWidget *impl_;
  WContainerWidget *headers_;
  WContainerWidget *headerContainer_;
  WTree            *tree_;

  std::vector<WLength> columnWidths_;

  void defineJavaScript();
};

}

#endif // WTREETABLE_H_