gecko/accessible/src/html/nsHTMLTextAccessible.h

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 * Contributor(s):
 *   Aaron Leventhal (aaronl@netscape.com)
 *   Kyle Yuan (kyle.yuan@sun.com)
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#ifndef _nsHTMLTextAccessible_H_
#define _nsHTMLTextAccessible_H_

#include "nsTextAccessibleWrap.h"
#include "nsAutoPtr.h"

class nsIWeakReference;

class nsHTMLTextAccessible : public nsTextAccessibleWrap
{
public:
  nsHTMLTextAccessible(nsIDOMNode* aDomNode, nsIWeakReference* aShell, nsIFrame *aFrame);
  
  // nsIAccessible
  NS_IMETHOD GetName(nsAString& _retval);
  NS_IMETHOD GetState(PRUint32 *aState);
  NS_IMETHOD GetRole(PRUint32 *aRole);
  NS_IMETHOD GetAttributes(nsIPersistentProperties **aAttributes);
  NS_IMETHOD Shutdown() { mFrame = nsnull; return nsTextAccessibleWrap::Shutdown(); }
  
  // nsPIAccessNode
  NS_IMETHOD_(nsIFrame *) GetFrame(void);

  // nsPIAccessible
  NS_IMETHOD FireToolkitEvent(PRUint32 aEvent, nsIAccessible *aTarget,
                              void *aData);

private:
  // We cache frames for text accessibles so that the primary frame map isn't
  // increased in size just due to accessibility. Normally the primary frame map,
  // which is used by nsIPresShell::GetPrimaryFrameFor(), does not include text frames
  nsIFrame *mFrame; // Only valid if node is not shut down (mWeakShell != null)
};

class nsHTMLHRAccessible : public nsLeafAccessible
{
public:
  nsHTMLHRAccessible(nsIDOMNode* aDomNode, nsIWeakReference* aShell);
  NS_IMETHOD GetRole(PRUint32 *aRole); 
  NS_IMETHOD GetState(PRUint32 *aState); 
};

class nsHTMLBRAccessible : public nsLeafAccessible
{
public:
  nsHTMLBRAccessible(nsIDOMNode* aDomNode, nsIWeakReference* aShell);
  NS_IMETHOD GetRole(PRUint32 *aRole); 
  NS_IMETHOD GetState(PRUint32 *aState); 
  NS_IMETHOD GetName(nsAString& aName);
};

class nsHTMLLabelAccessible : public nsTextAccessible 
{
public:
  nsHTMLLabelAccessible(nsIDOMNode* aDomNode, nsIWeakReference* aShell);
  NS_IMETHOD GetName(nsAString& _retval);
  NS_IMETHOD GetRole(PRUint32 *_retval); 
  NS_IMETHOD GetState(PRUint32 *_retval); 
  NS_IMETHOD GetFirstChild(nsIAccessible **aFirstChild);
  NS_IMETHOD GetLastChild(nsIAccessible **aLastChild);
  NS_IMETHOD GetChildCount(PRInt32 *aAccChildCount);
};

class nsHTMLListBulletAccessible : public nsHTMLTextAccessible
{
public:
  nsHTMLListBulletAccessible(nsIDOMNode *aDOMNode, nsIWeakReference* aShell,
                             nsIFrame *aFrame, const nsAString& aBulletText);
  NS_IMETHOD GetUniqueID(void **aUniqueID);
  NS_IMETHOD Shutdown();
  NS_IMETHOD GetName(nsAString& aName);
  NS_IMETHOD GetRole(PRUint32 *aRole) { *aRole = nsIAccessibleRole::ROLE_STATICTEXT; return NS_OK; }
  NS_IMETHOD GetState(PRUint32 *aState) { nsHTMLTextAccessible::GetState(aState); *aState &= ~nsIAccessibleStates::STATE_FOCUSABLE; *aState |= nsIAccessibleStates::STATE_READONLY; return NS_OK; }
  // Don't cache via unique ID -- bullet accessible shares the same dom node as this LI accessible.
  // Also, don't cache via mParent/SetParent(), prevent circular reference since li holds onto us.
  NS_IMETHOD SetParent(nsIAccessible *aParentAccessible) { mParent = nsnull; mWeakParent = aParentAccessible; return NS_OK; }
  NS_IMETHOD GetParent(nsIAccessible **aParentAccessible) { NS_IF_ADDREF(*aParentAccessible = mWeakParent); return NS_OK; }
protected:
  // XXX Ideally we'd get the bullet text directly from the bullet frame via
  // nsBulletFrame::GetListItemText(), but we'd need an interface
  // for getting text from contentless anonymous frames.
  // Perhaps something like nsIAnonymousFrame::GetText() ?
  // However, in practice storing the bullet text here should not be a
  // problem if we invalidate the right parts of the accessibility cache
  // when mutation events occur.
  nsIAccessible *mWeakParent;
  nsString mBulletText;
};

class nsHTMLListAccessible : public nsHyperTextAccessible
{
public:
  nsHTMLListAccessible(nsIDOMNode *aDOMNode, nsIWeakReference* aShell):
    nsHyperTextAccessible(aDOMNode, aShell) { }
  NS_IMETHOD GetRole(PRUint32 *aRole) { *aRole = nsIAccessibleRole::ROLE_LIST; return NS_OK; }
  NS_IMETHOD GetState(PRUint32 *aState) { nsHyperTextAccessible::GetState(aState); *aState &= ~nsIAccessibleStates::STATE_FOCUSABLE; *aState |= nsIAccessibleStates::STATE_READONLY; return NS_OK; }
};

class nsHTMLLIAccessible : public nsHyperTextAccessible
{
public:
  nsHTMLLIAccessible(nsIDOMNode *aDOMNode, nsIWeakReference* aShell, 
                     nsIFrame *aBulletFrame, const nsAString& aBulletText);
  NS_IMETHOD Shutdown();
  NS_IMETHOD GetRole(PRUint32 *aRole) { *aRole = nsIAccessibleRole::ROLE_LISTITEM; return NS_OK; }
  NS_IMETHOD GetState(PRUint32 *aState) { nsAccessibleWrap::GetState(aState); *aState |= nsIAccessibleStates::STATE_READONLY; return NS_OK; }
  NS_IMETHOD GetName(nsAString& aName) { aName.SetIsVoid(PR_TRUE); return mRoleMapEntry ? nsAccessible::GetName(aName) : NS_OK; }
  NS_IMETHOD GetBounds(PRInt32 *x, PRInt32 *y, PRInt32 *width, PRInt32 *height);
  void CacheChildren();  // Include bullet accessible
protected:
  nsRefPtr<nsHTMLListBulletAccessible> mBulletAccessible;
};

#endif