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nsHTMLTableAccessible.h

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 * The contents of this file are subject to the Mozilla Public License Version
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 * for the specific language governing rights and limitations under the
 * License.
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 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
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 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
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 * Contributor(s):
 *   Author: Aaron Leventhal (aaronl@netscape.com)
 *
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
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#ifndef _nsHTMLTableAccessible_H_
#define _nsHTMLTableAccessible_H_

#include "nsBaseWidgetAccessible.h"
#include "nsIAccessibleTable.h"

class nsHTMLTableCellAccessible : public nsHyperTextAccessibleWrap
{
public:
  nsHTMLTableCellAccessible(nsIDOMNode* aDomNode, nsIWeakReference* aShell);

  NS_DECL_ISUPPORTS_INHERITED

  // nsIAccessible
  NS_IMETHOD GetRole(PRUint32 *aRole);

  // nsAccessible
  virtual nsresult GetAttributesInternal(nsIPersistentProperties *aAttributes);
};

class nsITableLayout;

// To turn on table debugging descriptions define SHOW_LAYOUT_HEURISTIC
// This allow release trunk builds to be used by testers to refine the
// data vs. layout heuristic
// #define SHOW_LAYOUT_HEURISTIC

class nsHTMLTableAccessible : public nsAccessibleWrap,
                              public nsIAccessibleTable
{
public:
  NS_DECL_ISUPPORTS_INHERITED
  NS_DECL_NSIACCESSIBLETABLE

  nsHTMLTableAccessible(nsIDOMNode* aDomNode, nsIWeakReference* aShell);
  NS_IMETHOD GetRole(PRUint32 *aResult); 
  NS_IMETHOD GetState(PRUint32 *aState, PRUint32 *aExtraState);
  NS_IMETHOD GetName(nsAString& aResult);
  virtual nsresult GetAttributesInternal(nsIPersistentProperties *aAttributes);
  NS_IMETHOD GetDescription(nsAString& aDescription);
  NS_IMETHOD GetAccessibleRelated(PRUint32 aRelationType, nsIAccessible **aRelated);

  /**
    * Returns true if the column index is in the valid column range.
    *
    * @param aColumn  The index to check for validity.
    */
  PRBool IsValidColumn(PRInt32 aColumn);

  /**
    * Returns true if the given index is in the valid row range.
    *
    * @param aRow  The index to check for validity.
    */
  PRBool IsValidRow(PRInt32 aRow);

protected:

  /**
   * Selects or unselects row or column.
   *
   * @param aIndex - index of row or column to be selected
   * @param aTarget - indicates what should be selected, either row or column
   *                  (see nsISelectionPrivate)
   * @param aDoSelect - indicates whether row or column should selected or
   *                    unselected
   */
  nsresult SelectRowOrColumn(PRInt32 aIndex, PRUint32 aTarget, PRBool aDoSelect);

  /**
   * Selects or unselects the cell.
   *
   * @param aSelection - the selection of document
   * @param aDocument - the document that contains the cell
   * @param aCellElement - the cell of table
   * @param aDoSelect - indicates whether cell should be selected or unselected
   */
  nsresult SelectCell(nsISelection *aSelection, nsIDocument *aDocument,
                      nsIDOMElement *aCellElement, PRBool aDoSelect);

  virtual void CacheChildren();
  nsresult GetTableNode(nsIDOMNode **_retval);
  nsresult GetTableLayout(nsITableLayout **aLayoutObject);
  nsresult GetCellAt(PRInt32        aRowIndex,
                     PRInt32        aColIndex,
                     nsIDOMElement* &aCell);
  PRBool HasDescendant(char *aTagName, PRBool aAllowEmpty = PR_TRUE);
#ifdef SHOW_LAYOUT_HEURISTIC
  nsAutoString mLayoutHeuristic;
#endif
};

class nsHTMLTableHeadAccessible : public nsHTMLTableAccessible
{
public:
  NS_DECL_ISUPPORTS_INHERITED

  nsHTMLTableHeadAccessible(nsIDOMNode *aDomNode, nsIWeakReference *aShell);

  /* nsIAccessible */
  NS_IMETHOD GetRole(PRUint32 *aResult);

  /* nsIAccessibleTable */
  NS_IMETHOD GetCaption(nsIAccessible **aCaption);
  NS_IMETHOD GetSummary(nsAString &aSummary);
  NS_IMETHOD GetColumnHeader(nsIAccessibleTable **aColumnHeader);
  NS_IMETHOD GetRows(PRInt32 *aRows);
};

class nsHTMLCaptionAccessible : public nsHyperTextAccessibleWrap
{
public:
  nsHTMLCaptionAccessible(nsIDOMNode *aDomNode, nsIWeakReference *aShell) :
    nsHyperTextAccessibleWrap(aDomNode, aShell) { }

  // nsIAccessible
  NS_IMETHOD GetRole(PRUint32 *aRole)
    { *aRole = nsIAccessibleRole::ROLE_CAPTION; return NS_OK; }
  NS_IMETHOD GetAccessibleRelated(PRUint32 aRelationType, nsIAccessible **aRelated);
};

#endif  

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